A process for the chemical conversion of contaminated magnesium hydroxide to high purity solutions of magnesium bicarbonate include steps of providing an impure reagent including at least 40% and less than 95% by total weight of total metals of magnesium in a form of solid magnesium hydroxide and at least 10% by weight of total metals of calcium carbonate, combining the impure reagent containing the solid magnesium hydroxide with carbonic acid in water, thereby generating magnesium bicarbonate and water and then filtering out solid calcium carbonate leaving a solution of magnesium bicarbonate in water having a by weight ratio of Mg/(Mg+Ca) in the solution of greater than 95%. Heating and/or drying the magnesium bicarbonate solution produces correspondingly high purity magnesium carbonate.

A process for the chemical conversion of contaminated magnesium hydroxide to high purity solutions of magnesium bicarbonate include steps of providing an impure reagent including at least 40% and less than 95% by total weight of total metals of magnesium in a form of solid magnesium hydroxide and at least 10% by weight of total metals of calcium carbonate, combining the impure reagent containing the solid magnesium hydroxide with carbonic acid in water, thereby generating magnesium bicarbonate and water and then filtering out solid calcium carbonate leaving a solution of magnesium bicarbonate in water having a by weight ratio of Mg/(Mg+Ca) in the solution of greater than 95%. Heating and/or drying the magnesium bicarbonate solution produces correspondingly high purity magnesium carbonate.

A method is shown for the slaking of calcium oxides and magnesium from calcomagnesian compound containing at least 10 wt. % of MgO in relation to the total weight of said calcomagnesian compound, in which a slaking aqueous phase is supplied to a slaking device, and slaking the compound containing anhydrous dolomite delivered to the slaking device, by means of the slaking aqueous phase, forming hydrated solid particles of Mg(OH).sub.2, in the presence of an additive.

A method is shown for the slaking of calcium oxides and magnesium from calcomagnesian compound containing at least 10 wt. % of MgO in relation to the total weight of said calcomagnesian compound, in which a slaking aqueous phase is supplied to a slaking device, and slaking the compound containing anhydrous dolomite delivered to the slaking device, by means of the slaking aqueous phase, forming hydrated solid particles of Mg(OH).sub.2, in the presence of an additive.

[Problem] To provide a magnesium hydroxide-based solid solution which has smaller primary particles and secondary particles and improved reactivity with an acid as compared with conventional magnesium hydroxide (Mg(OH).sub.2), improves the flame retardancy and mechanical strength of a resin, and also forms a non-sedimenting slurry, providing the same handleability as a liquid.

[Structure] A magnesium hydroxide-based solid solution represented by the following formula (1): Mg(OH).sub.2-xR.sub.x (Formula 1), wherein R represents a monovalent organic acid, and x represents 0<x<1. The magnesium hydroxide-based solid solution is a magnesium oxide (MgO) precursor. A flame retardant for a synthetic resin, including the magnesium hydroxide-based solid solution as an active ingredient. A synthetic resin composition characterized by including 0.1 to 50 parts by weight of the magnesium hydroxide-based solid solution (b) per 100 parts by weight of a synthetic resin (a); and a molded article thereof.

A process and system are disclosed for producing lithium oxide from lithium nitrate. In the process and system, the lithium nitrate is thermally decomposed in a manner such that a fraction of the lithium nitrate forms lithium oxide, and such that a remaining fraction of the lithium nitrate does not decompose to lithium oxide. The thermal decomposition may be terminated after a determined time period to ensure that there is a remaining fraction of lithium nitrate and to thereby produce a lithium oxide in lithium nitrate product. The lithium oxide in lithium nitrate product may have one or more transition-metal oxides, hydroxides, carbonates or nitrates added thereto to form a battery electrode. The lithium oxide in lithium nitrate product may alternatively be subjected to carbothermal reduction to produce lithium metal.

A method for producing mesoporous magnesium hydroxide nanoplates involving solvothermal treatment of a solution of a magnesium salt, a base, a glycol, and water is disclosed. The method does not use a surfactant or template in the solvothermal treatment. The method yields mesoporous nanoparticles of magnesium hydroxide having a plate-like morphology with a diameter of 20 nm to 100 nm, a mean pore diameter of 2 to 10 nm, a surface area of 50 to 70 m.sup.2/g, and a type-III nitrogen adsorption-desorption BET isotherm with a H3 hysteresis loop. An antibacterial composition containing the mesoporous magnesium hydroxide nanoplates is also disclosed. A method for reducing nitroaromatic compounds with a reducing agent and the mesoporous magnesium hydroxide nanoplates as a catalyst is also disclosed.

Provided are: a spherical magnesium oxide having not only high sphericity but also smooth surface and having excellent moisture resistance and excellent filling properties, and a method producing the same. In the present invention, by controlling the boron and iron contents of the calcined magnesium oxide to be in the respective predetermined ranges, there is provided a spherical magnesium oxide having a volume-based cumulative 50% particle diameter (D50), as measured by a laser diffraction/scattering particle size distribution measurement, in the range of from 3 to 200 μm, which is the range for a relatively large particle diameter, and a high sphericity of 1.00 to 1.20, as measured from viewing a SEM photomicrograph, as well as smooth surface, and having excellent moisture resistance and excellent filling properties. A predetermined spherical magnesium oxide is provided by virtue of the synergies obtained from the boron content of 300 to 2,000 ppm and the iron content of 100 to 1,500 ppm.

Method and system are disclosed for the production and use of a chemical compound, where a given amount of CO.sub.2 is emitted in the production and the use, including producing a second chemical compound that is required for the production or the use of the first compound, where the production of the second compound consumes CO.sub.2 and sequesters it from the atmosphere so that the total net CO.sub.2 emitted in the production and use of the first compound is now reduced. In one embodiment, the second chemical compound is a negative-CO.sub.2-emissions hydrogen, oxygen or chlorine gas produced in an electrolytic cell.

Method and system are disclosed for the production and use of a chemical compound, where a given amount of CO.sub.2 is emitted in the production and the use, including producing a second chemical compound that is required for the production or the use of the first compound, where the production of the second compound consumes CO.sub.2 and sequesters it from the atmosphere so that the total net CO.sub.2 emitted in the production and use of the first compound is now reduced. In one embodiment, the second chemical compound is a negative-CO.sub.2-emissions hydrogen, oxygen or chlorine gas produced in an electrolytic cell.