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Index value of magnesium oxide!

2020-04-03 09:53:50
Times

Magnesium oxide (chemical formula: MgO) is an oxide of magnesium, an ionic compound. It is a white solid at room temperature. Magnesia exists in nature in the form of cristobalite is the raw material for smelting magnesium.


1 traits


White fine powder. Odorless. Due to different preparation methods, there are light weight heavy weight. It has strong refraction in the visible near ultraviolet range. The exposed air easily absorbs moisture carbon dioxide gradually becomes basic magnesium carbonate, which is lighter heavier. It combines with water to produce magnesium hydroxide, which is slightly alkaline has a pH of 10.3 in a saturated aqueous solution. However, it is easily soluble in dilute acid very slightly soluble in pure water, which increases its solubility due to the presence of carbon dioxide. Insoluble in ethanol. The relative density (d254) is 3.58. Melting point 2852°C. Boiling point 3600℃.


2 index value


Total sulfur content (S),% ≤0.02


Burning weightlessness,% ≤10.0


Hydrochloric acid insoluble matter,% ≤0.03


Heavy metals (as Pb),% ≤0.005


Calcium (Ca),% ≤0.05


Water soluble matter,% ≤0.5


Chloride (Cl),% ≤0.02


Nitrate (NO3),% ≤0.005


Phosphate (PO4),% ≤0.001


Content (MgO),% 99.9~100.1


Iron (Fe),% ≤0.005


Zinc (Zn),% ≤0.02


Barium (Ba),% ≤0.003


Silicic acid ammonia precipitate,% ≤0.05


3 Classification use


Industrial grade light burned magnesium oxide


Application areas: mainly used in the production of magnesite products. Lightly burned magnesium oxide magnesium chloride aqueous solution are mixed in a certain ratio, which can be gelled hardened into a hardened body with certain physical mechanical properties, which is called magnesite cement. Magnesite cement as a new type of cement has the advantages of light weight, high strength, fire heat insulation, energy saving environmental protection, can be widely used in the fields of building materials, municipal administration, agriculture, machinery so on. According to WB/T1019-2002 "Light Burned Magnesia for Magnesite Products", the chemical composition of light burned magnesium oxide is shown in Table 1.


Table 1 Chemical composition of lightly burned magnesium oxide


Grade


QM-85


QM-80


QM-75


level


Premium products (A)


First class (B)


Qualified products (C)


MgO ≥


85


80


75


Active MgO ≥


65


60


50


Free CaO ≤


1.5


2.0


2.0


Loss on ignition


1-9


1-9


≤12.0


High-grade lubricant grade magnesium oxide


Application areas: Mainly used in cleaning agents, vanadium inhibitors, desulfurization agents in the processing of advanced lubricants, greatly improving the compactness rheology of the lubricating film, reducing ash. Removal of lead mercury can reduce the pollution of lubricating oil fuel waste to the environment. Surface-treated magnesium oxide can also be used as a complexing agent, chelating agent, carrier in the refining process, which is more conducive to product fractionation improves product quality. Especially when the heavy oil is burned, the addition of Mg0 can eliminate the damage of vanadic acid in the heavy oil to the furnace.


Food grade magnesium oxide


Application areas: used as food supplements, color stabilizers, pH regulators as supplements of magnesium in health products foods. Used as a decolorant ice cream powder PH regulator in sugar refining. As anti-caking agent antacid, it can be used in wheat flour, milk powder chocolate, cocoa powder, grape powder, sugar powder, etc., can also be used in the fields of making ceramics, enamel, glass, dyes, etc.


Medical grade magnesium oxide


Application fields: In the field of biopharmaceuticals, medical-grade magnesium oxide can be used as antacids, adsorbents, desulfurizers, deleaders, complex filter aids, PH regulators, can be used as antacids laxatives in medicine. Too much stomach acid to treat gastric ulcer duodenal ulcer disease. The effect of neutralizing stomach acid is strong long-lasting, without producing carbon dioxide.


Silicon steel grade magnesium oxide


Application areas: Silicon steel grade magnesium oxide has good magnetic permeability (that is, has a large positive magnetic susceptibility) excellent insulation properties (that is, the electrical conductivity can be as low as 10-14us/cm dense state). The surface of the silicon steel sheet can be formed into a good insulating layer magnetically conductive medium to suppress overcome the eddy current skin effect loss (iron loss for short) of the silicon steel core in the transformer. Improve the insulation performance of silicon steel sheet, used as high temperature annealing separator. It can also be used as dephosphorizing agent, desulfurizing agent insulating coating generator in silicon steel for ceramic materials, electronic materials, chemical raw materials, binders, additives, etc.


Advanced electromagnetic grade magnesium oxide


Application areas: used in wireless high-frequency paramagnetic permeable magnetic materials, magnetic rod antennas, magnetic cores of frequency modulation components, etc. Replace ferrite. It can be used for the production of composite superconducting magnetic materials, also used in the electronic magnetic industry. As "soft magnetic material". It is also an ideal raw material for industrial enamel ceramics.


High purity magnesium oxide


Applications: High-purity magnesium oxide has excellent alkali resistance electrical insulation at high temperatures. High thermal expansion coefficient high thermal conductivity have good light transmittance. Widely used as high temperature heat resistant material. It is used as a raw material for translucent ceramic crucibles substrates in the ceramic field. It is used as a filler for magnetic devices, a filler for insulating materials, various carriers in the electrical materials electrical fields. Used as


The thermal conductivity of the ceramic substrate is more than twice that of alumina, the loss of electrolyte is only 1/10 of that of alumina. It can also be used as a raw material for high-purity fused magnesia, which can be used chemically as "analytically pure" magnesium oxide.


4 application areas


The annual domestic production of magnesium oxide is about 12 million tons. Determination of sulfur pyrite in coal sulfur arsenic in steel. Used as a standard for white pigments. Light magnesium oxide is mainly used as a raw material for preparing ceramics, enamels, refractory crucibles refractory bricks. It is also used as a filler for polishing agents, urls, coatings paper, as a promoter activator for neoprene fluoroelastomers. versus


After mixing solutions such as magnesium chloride, it can be made into magnesium oxide water transfer. In medicine, it is used as antacid laxative. It is used for gastric hyperacidity duodenal ulcer disease. In the chemical industry, it is used as a catalyst a raw material for the manufacture of magnesium salts. It is also used in the manufacture of glass, dyed meal, phenolic plastics, etc. Heavy magnesium oxide rice milling industry is used for firing mills semi-rollers. Construction industry for manufacturing


Artificial chemical floor, artificial marble, heat insulation board, sound insulation board, plastic industry, used as filler. It can also be used to produce other magnesium salts.


Used in rubber, plastics, wires, cable dyes, paints, glass, ceramics, chemical reagents, medicine, food additives, etc.


Used to prevent books being corroded by acid in the library;


Insulation for wires;


Used to treat heartburn, stomach acid acid indigestion;


Used as a short-acting laxative;


Used as a magnesium supplement;


Because it is refractory, it can be used as a furnace lining;


Used as a white reference in colorimetry; (Emission rate is about 0.9)


The compacted magnesium oxide can be used as an optical coating. When the coating thickness is between 300 nm 7 mm, the coating is transparent. The 1 mm thick coating has a refractive index of 1.72.


It is used for rock climbing can absorb hand sweat. Note: Inhalation of magnesium oxide smoke can cause metal smog.


Mainly used to formulate internal medicine to neutralize excessive stomach acid. Commonly used preparations are: magnesium emulsion-emulsion; magnesium cover sheet-each containing 0.1g of MgO;; acid powder-powder made of mixed magnesium oxide sodium bicarbonate.


The content activity of magnesium oxide is proportional to a certain range, beyond this range, it is inversely proportional!


The current magnesium oxide is misunderstood by most people as light burnt powder. In fact, this understanding is wrong. Light burnt powder can be said to be a kind of magnesium oxide. Its alias is also called light burned magnesium, light burned magnesium oxide. Ling bitter earth, bitter earth powder (transliteration in Japanese), magnesium calcium powder (because the light burning powder contains calcium oxide) The lower the calcium oxide content in the light burning powder in the building materials industry, the better!


Properties: White easy powder, odorless, easy to absorb moisture carbon dioxide when exposed to air, the product is soluble in acid ammonium salt, insoluble in water ethanol, melting point 2800, boiling point 3600, magnesium oxide has high refractory insulation performance, melting point Very high.



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