Magnesium Carbonate


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magnesium carbonate

[mag′nē·zē·əm ′kär·bə‚nāt]
(inorganic chemistry)
MgCO3 A water-insoluble, white powder, decomposing at about 350°C; used as a refractory material.

Magnesium Carbonate

 

MgCO3, a salt; colorless crystals. Density, 3.037 g/cm3. The decomposition of magnesium carbonate into MgO and CO2 is partial at 500°C and complete at 650°C Its solubility in water is low (22 mg/l at 25°C) and decreases with increasing temperature. Upon saturation of an

aqueous suspension of MgCO3 with CO2, the MgCO3 dissolves because of the formation of the hydrocarbonate Mg(HCO3)2. Basic magnesium carbonates are extracted from aqueous solutions in the absence of excess CO2. Magnesium carbonate interacts with metal carbonates to form double salts, an example of which is the natural mineral dolomite, MgCO3,CaCO3. Magnesium carbonate is widespread in nature in the form of the mineral magnesite. Basic magnesium carbonate, 3MgCO3,Mg(OH)2,3H2O, is used as a filler in rubber mixes, in the manufacture of thermal-insulation materials, and in medicine (as a tooth-powder ingredient and internally to counteract increased acidity).

magnesia insulation

Magnesium carbonate hydroxide, with or without admixture of fiber reinforcement or other materials; a good thermal insulator because of the great number of closed air cells it contains; molded into rigid boards, blocks, or shapes conforming to piping.
References in periodicals archive ?
1--In this region the Serpentinites and serpentinized Harzburgites often in surface sections have transformed into Hontite which is a Calcium and magnesium carbonate with [Mg.sub.3][Ca.sub.3]C[O.sub.3] chemical formulae; the Hontite is often exploited through primitive methods such as digging small wells of 1 to 2m depths.
[(MgC[O.sub.3]).sub.4]*Mg[(OH).sub.2]*5[H.sub.2]0 (magnesium carbonate hydroxide pentahydrate) and Mg[(OH).sub.2] (reagent grade, 95%) were purchased from Sigma-Aldrich.
As magnesium carbonate dissociates at lower temperatures than calcium carbonate, magnesium carbonate indeed dissociates before calcium carbonate when fuel is burned.
There are two process technologies currently used commercially to produce primary metal: electrolysis of magnesium chloride and thermal reduction of magnesium carbonate ores with ferrosilicon.
The same is true with the magnesium carbonate and potassium carbonate in this formula.
At first, the anticaking agent used was magnesium carbonate; today it is calcium silicate.
Harrison's company, TecEco Pty Ltd, has developed low-energy, low-cost magnesium carbonate cements with the potential to transform the built environment from a producer to a net consumer of C[O.sub.2].
John Harrison, a technologist from Tasmania, has developed a cement using magnesium carbonate instead of the calcium carbonate used for Portland cement.
Prior to digestion the material was impregnated with a solution made up with 26.7 g sodium sulphite per litre of water with or without a second agent such as sodium carbonate, sodium bicarbonate, magnesium carbonate, lithium carbonate and zinc carbonate.
Rejecting the notion of anti-perspirants, instead the patent pending Krysztals range of solid deodorant bars combat body odour with sodium bicarbonate, magnesium carbonate and naturally derived fragrance from essential oils.
Russell says carbonate ions react with magnesium, an element essential to bacterial survival, forming magnesium carbonate and depriving the pathogens of magnesium.
LoSalt is a blend of two thirds potassium chloride and one third sodium chloride, with magnesium carbonate added as a flowing agent.