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 ?
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.
2] results in the formation of magnesium carbonate in two steps that proceed nearly simultaneously (equations 4 and 5).
1993) examined the use of a combination of calcium and magnesium carbonate as a phosphate binder in patients on continuous ambulatory peritoneal dialysis (CAPD) for a one-year period.
Dry: Mix 1tsp light magnesium carbonate powder (pounds 3.
The first method described by Ramsay [3] was recently modified by the same author [4]: Excess iron is added to serum to saturate both binding sites of transferrin, and non-bound iron is removed by adsorption on "light" magnesium carbonate.
com/research/ce202b/natural_magnesium) has announced the addition of the "Natural Magnesium Carbonate (Magnesite): Trends and Prospects in International Trade" report to their offering.
The key steps included purification by pH adjustment with magnesium carbonate, precipitation of REEs with sodium carbonate, selective re-extraction of the REEs with hydrochloric acid, re-precipitation of REEs with oxalic acid and, finally, calcination of the rare earth oxalate to produce a REO for refining.
The acid component is selected from the croup consisting of citric acid, fumaric acid, tartaric acid, malic acid, adipic acid and mixtures thereof and the carbonate salt component is selectee from the group consisting of sodium carbonate, sodium bicarbonate, potassium carbonate, ammonium carbonate, magnesium carbonate, calcium carbonate and mixtures thereof.
Magnesium carbonate, Fuller's Earth and calamine powders are ideal.
Dolomite, or calcium magnesium carbonate, is a close cousin of limestone (calcium carbonate), and geologists suspect that most dolomite forms when limestone somehow incorporates magnesium ions derived from seawater.