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Magnesite-based Chemicals

    The magnesite-based chemicals we export are magnesium sulphate, magnesium carbonate, magnesium oxide or lightweight magnesium oxide, magnesium fertilizer etc. which are mainly made of magnesite.


1. Magnesium Sulphate

    The chemical composition is MgSiO4 which is white crystalline. There are varieties of hydrate containing crystal water, those seen often are anhydride, monohydrateMgSiO4H2Oand heptahydrateMgSiO47H2Owhich are obtained from the reaction of magnesite or caustic calcined magnesite with sulfuric acid. Heptahydrate is used most often which,  being colorless crystal with bitter and salty taste,  is also called bitter salt. It is normally used as finishing agent and mordant in textiles;  bulking agent in paper-making field; flame-proofing agent intensifying the refractory property for paper and fabric in fire protection field; caccagoge in medicines; ferment accelerator in food processing field etc. 

Grade MgSiO47H2O Chloride Ferro Arsenic Manganese 5% aqueous solution PH value
% ≥ % ≤ % ≤ % ≤ % ≤
A 99.5 0.05 0.0015 0.0002

0.004

6.4

 

2. Magnesium Carbonate

    The molecular formula is MgCO3; white or white gray lump or powder; density is 3.037; discomposing when heated to 350C, turning into magnesium oxide when heated to  700C. Natural raw magnesite is good to ordinary applications whilst that of high purity can be obtained through chemical synthesizing (for example, to mix magnesium sulphate with the solution of sodium carbonate and then be heated, precipitated, filtrated, dehydrated and exsiccated). It is mainly used as reinforcer for natural rubber, moisture proof material, leavening agent for bread and biscuits, photo extinction additive for coatings and paint, base stocks for making toothpaste, cosmetics and medicines.

Brand

Chemical composition (%)

Size
(mm)

MgO ≥

SiO2

CaO ≤

LM-47

47

0.6

0.6

at Buyer's option

LM-46

46

1.2

0.8

LM-45

45

1.5

1.5

 

3. High Purity Heavy Weight Magnesium Oxide and Lightweight Magnesium Oxide

     Molecular formula is MgO; white powder, non-soluble to acid, slightly soluble to water, smell-less, tasteless, nontoxic.  Producing method: first making raw magnesite into magnesium hydroxide then making it react with carbon dioxide so as to forming magnesium carbonate, and finally becoming into magnesium oxide after calcination. 

     Magnesium oxide or lightweight magnesium oxide is a kind of basic chemical materials with various applications, such as skin nourishing cream in cosmetics, material for making some refractories, deslagging agent in steel making furnace; material or additive for making paints, coatings, dyestuffs, adhesives, buffing compound, glass, porcelain enamel; rubber stuffing, paper stuffing, plastic compounding agent, food additive, water processing agent, catalyst carrier, insulating coating for silicon steel sheet, basic material for some magnetic materials and medicines etc.

 

High Purity Heavy Weight Magnesium Oxide

Grade

Super Grade First Grade

Chemical Composition (%)

MgO ≥ 99.5 99.0
CaO ≤ 0.005 0.01
Fe2O3 0.005 0.01
Sulphate (SO42-) ≤ 0.05 0.10
L.O.I. % ≤ 1.0 1.5
Bulk Density  g/cm3 1.00 0.80
Residue on Sieve 75m % 0.50 0.50

 

High Purity Light Weight Magnesium Oxide

Grade

Super Grade

Chemical Composition (%)

MgO ≥ 98.000
CaO ≤ 0.050
Fe

0.020

Sulphate (SO42-) ≤ 0.100
Mn ≤ 0.002
Cl ≤ 0.030
Insoluble in acid % ≤ 0.050
L.O.I. % ≤ 2.000
Bulk Density  g/cm3 0.200
Residue on Sieve 150m % 0.030

 

4. Magnesium Fertilizer

    Magnesium fertilizer is a kind of fertilizer based on magnesium as macronutrient. Magnesium facilitates the absorption of phosphor for plant and vegetable, it is one of the elements of forming chlorophyll. The magnesium fertilizer we export is largely the sulphuric magnesium fertilizer, that is, monohydrate magnesium sulphate (MgSiO4H2O).

    4.1  Sulphuric Magnesium Fertilizer (Monohydrate Magnesium Sulphate)

    It is white powder (which can be also processed into small balls of 2-4mm) and widely used in agriculture and forestry field.

Grade Acid soluble
MgO
Water soluble
MgO
S CaO H2SO4 Moisture Size
% ≥ % ≥ % ≥ % ≤ % ≤ % ≤ Mesh
A 27 22-24
-25-26
17-19-
20-21-22
1.2 0.5 2 60, 80, 100, 120
 

If you have any question or comment please leave a message in our Feedback Page or contact us by:

Phone: (411) 8364 8293,    Fax: (411) 8363 7530,    Email: sales@magnesite.com.cn

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