Manufacture MgCO and MgO Through Magnesium Sulfate Heptahydrate

1. In the presence of catalyst, the magnesium sulfate prepares magnesium oxide by the carbonaceous reducing agent.

2. The hydrochloric acid circulation method combines the production between barium sulfate and magnesium oxide.

   This kind of hydrochloric acid circulation method belongs to the method of preparing chemical substances. It mainly uses magnesium sulfate and barite deposit as raw material. Compared with industrial barium sulfate, it has a lower cost. Therefore, it is used for deal with the medicinal barium sulfate, and overcomes barium sulfate’s shortages, such as the high sulphur content, low whiteness and can not be used in medical. At the same time, it solves the problems of gross barium carbonate residue pollution.

3. Prepare active magnesium oxide utilizing magnesium sulfate waste water

   Under the circumstance of mechanical agitation, adding the lime milk into the magnesium sulfate waste water. Its concentration must be from 15% to 25%, and PH value must be from 12 to 13. After stirring for some time, the magnesium sulfate and magnesium hydroxide are mixed into precipitate. And then, moving the precipitate into micropressure reaction still, the pressure should be controlled from 2kg to 6kg. Carbonizing it by carbon dioxide, and we can obtain  magnesium bicarbonate solution after filtration. Under heating and stired, pyrolyzing the magnesium bicarbonate solution can obtain precipitate of basic magnesium carbonate. The pyrolytic time is from one to two hours. Finally, it can obtain active magnesium oxide after filtration, washing and drying, burning it for four to six hours at the temperature of 950℃ to 1000℃. This method has a lot of advantages: simple craft, high production efficiency, high magnesium yield coefficient, low cost, environmentally friendly, etc. Therefore, the magnesium sulfate waste water is utilized reasonably. At the same time, it provides a new method to deal with the magnesium sulfate.

4. Manufacture MgCO and MgO through magnesium sulfate heptahydrate

   For the exploitation of ascharite ore, producing the boracic acid while producing a large number of magnesium sulfate heptah. It is the by-product. Therefore, it is necessary to develop and use the magnesium salt. Generating basic magnesium carbonate through the reaction between epsom salt and ammonium bicarbonate. And then, calcining and producing light magnesium oxide. The light magnesium oxide has widely applications. For example, the light magnesium oxide used for rubber industry, metallurgical industry, fireproofing insulation materials, ceramics industry and other industries. Therefore, it has a certain value to produce light magnesium oxide through magnesium sulfate. 

Some Difficulties of High Pure Magnesium Oxide

   The high purity magnesium oxide includes high purity industrial magnesium oxide, high purity silicon-steel magnesium oxide, high purity medicine magnesium oxide and so on. The subject, produce high-purity magnesium oxide and porous strong adsorbent from serpentine rock, was settled in February 1993. After hundreds of laboratory experiments, it made a great breakthrough from the end of 1996 to the beginning of1997. It got the high pure magnesium oxide with more than 98% of purity, and the porous strong adsorbent with lower quality. In January 1999, it cooperated with Meishen Technology. And it got the high-purity magnesium oxide with more than 98% of purity after a successful trial-produce in June 2000. On December 3, it got the high pure magnesium oxide with the content of 99%, and the porous strong adsorbent with higher quality. Since 2001, Meishen Technology started to short run production. From then on, it finished the history that Chinese can not produce high purity magnesium oxide. Chinese magnesium salt production turned a new page. 

   The different industries have different requirements for high pure magnesia’s indexes. For example, in electron industry, some elements need that the content of magnesium oxide must more than 99%. Except for the physical parameters, the silicon steel magnesium oxide has special requirements to chemical purity. The lower content of CaO and B2O3, the better of it. Because the CaO and B2O3 can reduce refractoriness. The lower content of SO42- and C1- and impurity amount, the better of it. The lower poisonous and harmful element is better in pharma grade magnesium oxide. With the increasingly science, technology and comprehensive national strength, it only can cater to the needs of an economy through continuous innovation.  

   In the last few years, this kind of magnesium oxide was recycled since 2006. Putting in time and energy into the technology improvement, it made a great progress. This technology is the only high and new technology project which can be put into industrial production and has proprietary intellectual property rights. Passing a few years of production practice, this project went through the successful break through from model phase to laboratory, from industrialization production to the perfection and maturity of process engineering, from the high cost to lower energy-saving. It has already form various of magniferous solid-liquid mineral, and produce more than 99% high purity magnesium oxide with different specifications and applications. 

   At present, there are some difficulties for high pure magnesium oxide in domestic market. It affects the development of this industry. With the overall national strength increasing, there is great hope for the development of high purity magnesia.

The Characteristics and Applications of Nano Magnesium Oxide

   Ten years ago, magnesium oxide manufacturers and suppliers have been sprouting up. Only after a few years, a larger number of enterprises closed down. Because they did not master the core productivity. In order to change this kind of predicament, Meishen Technology has already researched and developed the nano magnesium oxide product with Meishen’s characteristics. Therefore, what are the characteristics and applications of the nano magnesium oxide?

   The average grain diameter of nano magnesium oxide is 50nm. The content of magnesium oxide is equal or greater than 99.9 percent. The content of calcium oxide is less than or equal to 0.01 percent. The chloride is less than or equal to 0.03%. The iron is less than or equal to 0.01%. The specific surface(m2/g) is from 30 to 50. And the iodine absorption value(mg/g) is equal or greater than 60. The product is white powder, nonpoisonous and tasteless. It has small grain size and large specific surface area. Differ in the noumenon biomaterials’ photochemical characteristics, electrochemical characteristics and magnetochemistry characteristics, it has high hardness, high purity and high melting point. The high chemical purity is reflected in: MgO≥99.9%. What’s more, it has excellent suspension property in the water, and is convenient to coating. It has a lower efficiency of hydration and a certain activity. When the iodine absorption value is about more than 60, it achieves middling activity. At this point, it only add a little nano magnesium oxide used for rubber as activating agent. In addition, it has a very good effect and a certain caking property.

   In the chemical fiber and the plastics industry, the nano magnesium oxide is used for fire retardant. In the production of silicon steel sheet, the nano magnesium oxide is used for high-end ceramic material, electronic industry material, the binder and additive of chemical materials. In the radio industry, it is used for high frequency ferrite rod antenna, magnetic device padding, insulating material padding and other carriers. What’s more, it is also applied in other fields, such as electron, catalyze, ceramics, oils, coating, etc.

   The contact number of Meishen Technology is: +86-0319-3928529. And the cell-phone number is: 15081492068. Welcome to inquire, visit and discuss at any time!

The Research of Single Crystal Magnesium Oxide

   The single crystal magnesium oxide(MgO) has excellent chemical stability, thermal conductivity and insulativity at high temperatures. At high frequencies, it has a little dielectric constant and loss. It is a kind of important high-temperature superconducting thin film single crystal substrate which can be industrialized.

   At present, it has less research to the ultra-precision machining technology of single crystal magnesium oxide, and has no intact ultra-precision machining technology which is only propitious to single crystal magnesium oxide. Adopting the method of chemico-mechanical polishing(Chemical Mechanical Polishing, CMP) to process the surface of single crystal magnesium oxide substrate. It can wipe off the subsurface damage layer through the reciprocal action of chemistry and machinery. Therefore, it can efficiently obtain ultra-smooth surface of single crystal magnesium oxide substrate without damage. Based on a lot of GMP experiments, it researches the principal factors which affects the CMP process. The principal factors include polishing pad, polishing solution, polishing pressure, rotation speed, etc. And Meishen researches the influence rules of single crystal magnesium oxide substrate from these factors.

   According to the physicochemical property of single crystal magnesium oxide substrate, it researches and develops chemi-mechanical polishing liquid which is suit for it. For the main property parameters of polishing pad, it tested and evaluated. What’s more, in the same technological parameters, using different polishing pad to test single crystal magnesium oxide substrate respectively, contrasting and analyzing the action mechanism and polishing quality of different polishing pad. And then, choosing a kind of polishing pad which suits for single crystal magnesium oxide substrate. After the orthogonal experiment, it can obtain a better surface quality of substrate through optimizing CMP technological parameters. The Ra(surface roughness) can achieve 1.3(measuring result of AFM). Therefore, it increases the processing efficiency, reduces the cost. In addition, aim to the difficult problem hard to control the substrate with small size during the processing of CMP, it has great guiding significance for improve surface figure accuracy of the substrate.

   Meishen Technology is a professional magnesium oxide manufacturer, which produce magnesium oxide, magnesium carbonate, magnesium sulfate, magnesium hydroxide, gym chalk and others. Welcome to visit and cooperate!

Magnesium Hydroxide Inorganic Flame Retardant Has Great Development Potential

   The magnesium hydroxide belongs to additive type inorganic flame retardant. Compared with congeneric inorganic flame retardant, it has a better smoke suppressing effect. 80 percent of people died due to smoke in fire hazard, therefore, smoke suppression is more important than inflaming retarding in modern fire retardant technology.

   During the process of production, use and abandon, magnesium hydroxide has no hazardous substance. What’s more, it can neutralize acid gas and acid gas produced by combustion process. So it is a environment friendly green flame retardant. The magnesium hydroxide has a high thermal decomposition temperature. It has 140℃ higher compared with common inorganic flame retardant aluminium hydroxide. The synthetic material with magnesium hydroxide can bear higher processing temperature. It is beneficial to accelerate the extrusion molding speed and shorten the molding time. At the same time, it is conducive to improve the flame retardance efficiency.

   The magnesium hydroxide has small grain size, and is less wear on equipment. It is help for prolong life-span of processing equipment. Because of the low production cost, it can be widely used in polypropylene, polyethylene, polyvinyl chloride, high-impact polystyrene, ABS and other fields. At present, there are more than 20 enterprises to produce more than 20 varieties. The total annual production capacity is about 17 thousands tons. Now, a large number of countries is building or designing to build new equipment of magnesium hydroxide. According to the pertinent data, the total annual production capacity of magnesium hydroxide equipment is about 14 thousands tons in recent years.

   At present, the domestic annual production capacity of magnesium hydrate fire retardant is about 13000 tons. Due to the increasing awareness of environmental protection, the foreign has used a large number of inorganic flame retardant. Among these, the inorganic flame retardant consumption quantity of America, Japan and Western Europe respectively accounts for 60%, 64% and 50%. And in the inorganic flame retardants, it centers on the aluminium hydroxide and the magnesium hydrate. Compared with aluminium hydroxide, the magnesium hydroxide has numbers of advantages. Therefore, the magnesium hydroxide occupies more and more proportion. Analysis of foreign statistical data, the magnesium hydroxide fire retardant consumption quantity of western developed countries occupy more than 30% of total measure of consumption. The American consumption is 50000 tons, the Western Europe is 80000 tons and the Japan is 30000 tons. The next 5 years, it anticipated that their average growth rate of the consumption will be about 12%, 8% and 7%. Based on the above analysis, the magnesium hydroxide fire retardant has a bright future.

   Meishen Technology is a professional magnesium hydroxide and magnesium oxide manufacturer, which produce magnesium oxide, magnesium carbonate, magnesium sulfate, magnesium hydroxide and other. Welcome to visit and cooperate!

Meishen Magnesium Oxide Can Replace Import

   Through the operation practice these two years, the high end magnesium oxide project of the Meishen Technology is scientific and reasonable. it has strong applicability and operability, stable production system, accurate and reliable autocontrol, stable product quality and index. After amount of sample inspection, wen can sure that all products produced by Meishen are strictly tested according to the standard detection method. All of the physical and chemical property, quality index achieve the design requirements. After the detection of different quality testing institutions and the practice of some customers, it reflects that the product application performance and quality index are good, and can be comparable with the congeneric international famous brands.

On the whole, the quality level of magnesium oxide product is superior to the same domestic industries. Each main quality index can achieve even surpass the quality level of the international first-class products. Especially the stability, content,whiteness and some other quality indexes has already achieved or been slightly better than international famous brands. What’s more, the products in different months and batches remain a very stable quality level. The foreign testing organizations has tested these magnesium oxide’s impurity and harmful elements. They found it has low or even none of content of plumbum, arsenic, chromium, mercury and other heavy metals, the insoluble matter in hydrochloric acid, sulfate, chloride and other toxic and harmful substance. It conforms to the standard requirements of RoHS. In addition, it has been accepted by domestic and international magnesium oxide manufacturers, suppliers and users. It is another rich fruits of Meishen Technology’s scientific and technological innovation, and filling a domestic gap of the high end magnesium oxide application area. This strategy played a positive role for improving  diversified competition and promoting firms' transformation and upgrading.

   After the multiple batches detection and use in different industries and users, it is widely believed the physicochemical indexes and applied indexes of Meishen’s high end magnesium oxide can meet the application requirements. These indexes include content, heavy metal, whiteness, grain size and so on. Among these, compared with domestic similar product, it is better in dispersibility, covering power and whiteness. It is basically the same as the products of Israel and Kyowa. In popular type application areas, it can absolutely replace the imported high-end magnesium oxide.

Application of Meishen’s Active Magnesium Oxide

   Because there is no products with higher activity, the magnesium oxide industry has been enslaved to the foreign magnesium oxide manufacturers. In order to change this kind of current situation, Meishen Technology succeed in researching and developing the active magnesium oxide 150 independently. Therefore, what are the applications of this active magnesium oxide 150 of Meishen.

   The active magnesium oxide 150 is researched by the Meishen Technology independently. The content of it is 98.0, the density(g/cm3) is 0.48, the iodine absorption value( ml/g) is 150 and the specific surface area(BET,m2/g) is 145. It is white powder. The package of it has two kinds: the paper package is 20 kilograms each bag, and the plastic package is 1kilogram each bag. When you store it, you should pay attention to the aeration-drying and keep away from Moisture. After using, please remember to seal the opening.

   The active magnesium oxide 150 of Meishen can used as the fortifier of heat-resisting sizing material to improve the heat-resistant quality when it is filled in butadiene-acrylonitrile rubber and other kinds of rubbers. The active magnesium oxide 150 of Meishen has high purity and  less impurity. It is appropriate for the product which has strict requirements for heavy metal. The dosage is 2-15PHR. What’s more, it can be used for conductive silicone sheet, conductive resin PA6 and PPS. Through matching the different grain size, the thermal conductivity can achieve 5W/m.K.

   The active magnesium oxide 150 of Meishen is the high pure magnesium oxide which is burned and reacted completely, and refined from seawater by chemical process. It belongs to ultramicro powder. What’s more, the surface treatment of it uses special material. The product has superior polymerism and excellent dispersing performance, and is easy to repel moisture. In addition to be the vulcanizing agent and activating agent, it also can be used as reinforcing filler. The higher activity value is 150. It has strong acid absorb performance, and especially suitable for rubber based adhesive, natural rubber pressure sensitive adhesive, styrene-butadiene rubber adhesive, nitrile-butadiene rubber, fluororubber, chloroprene rubber adhesive, chloroprene rubber glue and chlorosulfonated polyethylene. It can improve the products’ curability and physical property.

How About the Special Magnesium Oxide Used for Adhesive?

   The adhesive is a major consumer of magnesium oxide. Generally speaking, a standard adhesive enterprise need to consume about two tons of magnesium oxide every month. This fully explains that the magnesium oxide is an indispensible raw material to produce adhesive. Now, let us look at the special magnesium oxide used for adhesive in more detail.

   The active magnesium oxide is one of the important raw material of chloroprene rubber adhesive agent, the activity of magnesium oxide can reflect the reaction capacity between magnesium oxide and chloroprene rubber adhesive agent. The higher activity, the faster reaction rate with chloroprene rubber adhesive agent. The active magnesium oxide’s effects are extensive: sulfurization crosslinking agent, acid absorption, scorch safety, and so on. Because of its large specific surface area and high activity, it can used in chloroprene rubber adhesive agent, and improve the initial adhesion and adhesive strength of adhesive. What’s more, it can improve adhesive’s transparency. The most important feature is to prevent precipitated and separated. Generally speaking, the activity of active magnesium oxide is indicated by the iodine absorption value(mgI2/g). When the iodine absorption value is less than 40, it is the low activity. When the iodine absorption value is from 40 to 100, it is the middle activity. And when the iodine absorption value is higher than 100, it is high activity. The chloroprene rubber adhesive agent with high quality general uses high active magnesium oxide.

  During the reaction process, the active magnesium oxide reacts with tert butyl phenolic resin. It requires that the active magnesium oxide has a high activity(the iodine absorption value is higher than 100), large specific surface area, fine particle, good dispersibility and proper bulk density(from 0.29/cm3 to 0.3g/cm3). If the bulk density is large, it is easy to precipitate. If the the bulk density is small, the operating environment is execrable. In addition, the active magnesium oxide should be protected against moisture. Because the moisture adsorb on the surface of active magnesium oxide. It makes that the activity of active magnesium oxide becomes lower. Therefore, the reaction process is affected. So the active magnesium oxide must be controlled the moisture content before using, the better is drying. The better active magnesium oxide, which used for this reaction process, is produced by Meishen Technology is better than other magnesium oxide manufacturers.

Can They Substitute Each Other?

   The magnesium oxide and zinc oxide play a role of activating agent in rubber. However, this two has different activity effect in rubber. So they can not interchange with each other.

   Zinc oxide: the trivial name is zinc white, white hexagonal crystal or powder. The proportion is 5.606, and the melting point is 1975°. It is a kind of amphoteric oxide. The zinc oxide is soluble in acids, sodium hydroxide and ammonium chloride solution. And it is insoluble in water or ethyl alcohol. It presents yellow in high temperature, recovers to white after cooling, and sublimates when heats to 1800℃. It can used for the filler of paint and rubber. In medicines, it is used for making ointment, zinc paste, adhesive plaster and so on. The zinc oxide can treat skin wound and play a role of astringent. Heating the zinc spelter can generate zinc vapor. The zinc vapor can directly combine with oxygen, or directly firing zinc carbonate. It can produce zinc oxide.

   Magnesium oxide: It also can be called magnesia. It is white loose powder, odourless and tasteless. This product is insoluble in water and ethyl alcohol. The melting point is 2852℃, boiling point is 3600℃. The magnesium oxide has excellent fire-resistance and insulating property, and can be divided into light magnesium oxide and heavy magnesium oxide. The light magnesium oxide is dense, and white amorphous powder, tasteless, odorless and non-toxic. The density is 3.58g/cm3, difficult to insoluble in pure water and organic solvent. The solubility in water will be increase because of the existence of carbon dioxide. It is soluble in acid and ammonium salt solution. Through a high temperature sintering, it translates into crystal. It can form magnesium carbonate double salt when meets carbon dioxide in the air. The heavy magnesium oxide is tight, white or beige powder. It is easy to combine with water. when exposes in air, it is easy to absorb water and carbon dioxide. Mixing with magnesium chloride solution, it is easy to gel hardening. The light magnesium oxide is mainly used for the accelerant and activating agent of chloroprene rubber and fluororubber.

Promoting Export Situation of Domestic Magnesium Oxide Crude Drugs

   For the magnesium oxide manufacturers and suppliers, in order to hold advantage in the mainstream market, it must strengthen the consciousness of international rules. Therefore, it can acquire the traffic permit in the world magnesium oxide market.

   In the aspect of magnesium oxide crude drugs, China has already accumulated abundant experience. The related specialist has given opinions and made comments for domestic generic drugs: In the first place, the gap is from raw material. Although our country has been a big exporter of crude drugs, there are many crude drugs used for preparation production after exporting and refining. In the second place, the gap is from auxiliary material. The domestic auxiliary material has less description and relatively unstable quality compare with some developed countries.

   There are a large number of magnesium oxide suppliers and manufacturers at home and abroad. And they have different situations. Therefore, these manufacturers should locate themselves reasonably when they regard the export trade as strategy. Should you focus on the traditional bulk pharmaceutical chemicals, the key intermediate, or investing and researching new medicine? In this aspect, in the last few years, Meishen Technology ensures the product marketing by contract-based production form. So, it both creates benefit and gathers the experience during the cooperation with foreign enterprises. In addition, it promotes the magnesium oxide manufacturer’s comprehensive quality. Therefore, it is the feasible way to enter international market.  

   The magnesium oxide manufacturer, which regards the export trade as the development strategy, must gather enough information about international magnesium oxide market. The information includes a serious of problems, such as variety, economic laws and regulations of export market, cooperative partners, credit standing and respectability and others. What’s more, they should make decision after combining with self condition. The works in each link need to be responsible for professional full-time staffs. In addition, it need to establish coordination mechanism within companies. The special group need to be supported and assisted from senior leaders to the workers at the production line. 

Five Methods to Prepare Magnesium Oxide

There are five methods which can prepare the magnesium oxide:

1.Brine-lime method

   Firstly, the brine will be treated purifying, and the lime will be treated digestion and deslagging. Made the lime milk from the brine and the lime. In the precipitation tank, the lime milk makes the precipitation reaction. Adding the flocculating agent into slurry, you should separate it after mixing in the settling tank. And the, through filtration, washing, drying and smashing, it can make the finished product of magnesium oxide.

2.Brine-ammonia process

   The purification treatment can remove sulphate, carbon dioxide boron and other impurities. the brine can be regarded as raw material. Using ammonium hydroxide as precipitator in the reaction still. Before the reaction, you should add a certain seed crystal and intensive mixing. The proportion between brine and ammonium hydroxide should be 1：(0.9～0.93), and the temperature should be controlled in 40℃. After finished the reaction, you can add the flocculating agent. After the filtration, you should wash it, dry it and smash it. Finally, the magnesium oxide will be made. This test method remains to improve yield, cut down wash cycle and improve manufacturing technique.

3.Magnesia-hydrochloric acid-ammonia process

   It can produce magnesium oxide and carbon dioxide through calcining the magnesite and anthracite or coke. Magnesia powder was added water and mixed to starchiness. This starchiness reacts with hydrochloric acid, which has a certain concentration, it can prepare the magnesium chloride solution. This magnesium chloride solution reacts with ammonium hydroxide in the reactor. The product can obtain magnesium oxide through washing, settling, filtering separation, drying and smashing. According to your need, it can add the surface treating agent.

4.Microcrystalline magnesium oxide

   Under the indoor temperature, it can compound saturated solution of MgCl2·６Ｈ2O. Mixing it and adding excess stronger ammonia water in 70℃. Therefore, the magnesium oxide can be cemented out slowly.

   Pay attention to: the distilled water and ammonium hydroxide must not have CO2. The distilled water should be full boiled. The CO2 in NH3 need to be removed by KOH.

5.Large-grained magnesium oxide

   Adding about 243mL of water to a wide mouth container, and then, you can add 1375g of KOH and 485g of MgCl2·6Ｈ２Ｏ. Heating it until 210℃ in the electric furnace, and clarifying it after half hour. During 18 hours, chilling it to the indoor temperature. There is separated out crystal which diameter is about .2mL. In the temperature of 100℃, it is dried about 2 hours. Finally, it can make the magnesium oxide with large grain.

   The above analysis is from expert of Meishen Technology, which is a professional magnesium oxide manufacturer and supplier.