SU574391A1 - Method of preparing magnesium hydroxide - Google Patents

Description

one

The invention relates to the technology of inorganic substances and can be used to produce hydroxide magic.

P1bBest A method of producing magnesium hydroxide from ores containing calcium carbonate, which includes treating the calcined raw material with magnesium chloride. The magnesium hydroxide precipitated at ET01M is separated and washed with 1.

There is also known a method for producing magnesium hydroxide by treating magnesium-containing solutions, for example brine or sea water, with alkali followed by washing the precipitated magnesium hydroxide with an aqueous solution of alkali and separating the target product by filtration 2.

However, magnesium hydroxide, obtained in a known manner, has low filtration properties. So the filtration rate is 3.9. The consumption of washing liquid tsa 1 t Mg (OI) 2 - 7 t.

The aim of the invention is to increase the filtration rate.

This is achieved by the proposed method of obtaining magnesium hydroxide, which consists in treating the magnesium-containing solution with an alkali solution, washing the precipitate of magnesium hydroxide and separating the target product by filtration and drying the precipitate of magnesium hydroxide before washing at a temperature of 105-500 ° C.

This treatment is diluted with H1, and ceric uterine liquors are subjected to alkali.

The technology of the method is as follows.

The magnesium-containing solution and the alkali solution are fed to the precipitation of magnesium hydroxide. The resulting magnesium hydroxide is separated from the liquid phase and dried at a temperature of 105-500 ° C. Dry the magnesium hydroxide washed and filtered.

Example. To 500 g shenitovogo uterine liquor composition. weight. %:

K 3.90; Mg 3.11; Na 4.50; Cl 15.44; SO 5.56; PaO 67.49, poured 256 g of a 1% aqueous solution of sodium hydroxide and stirred for 20 minutes. The resulting magnet hydroxide is filtered to obtain a solution of the following composition, b. %:

K 2.98; Mg 0.06; a 7.55; C1 11.53; S04 4.05; POO 73.83, which is directed to the extraction of the components contained in it, and the solid phase (125 g), composition, weight, i:

Mg (OH), 28.80; K 3.11; Na 6.70; Cl 10.31; SOi 3.85; HYO 47.23, dried at 105 ° C.

Dry magnesium hydroxide is subjected to h & three washing with 1% solution

sodium hydroxide and wash once with water, filtered after each wash. The amount of washing liquid at each stage is taken at the rate of 3 tons per 1 ton of Mg (OH) 2. At the output, 61 g of magnesium hydroxide of the following composition were obtained, weight. %: MgffOH) 58.94; K is absent; Na 0.12- C1 O 04: SO ,, 0.08; DLO 40.82, which is 96.33% of the injected amount of magnesium in the magnesium-containing solution. The filtration rate was 15.6.

The use of the invention makes it possible to obtain magnesium hydroxide as compared to existing ones, by their methods with improved filtration properties. So. the filtration rate of magnesium hydroxide is increased by a factor of 3-4. In addition, the flow rate of the washing liquid is reduced by 2-2.3 times.

Formula inventions

Claims (2)

1. A method of producing hydroxide of magic, which includes treating the magnesium-containing solution with an alkali solution, washing the precipitate of magnesium hydroxide and separating the target product by filtration, characterized in that, to increase the filtration rate, the precipitate of magnesium hydroxide is dried at a temperature of 105-500 ° C. 2. A method according to claim 1, characterized in that the sheathitic uterine liquors are subjected to treatment with an alkali solution. Information sources, taken into account during Examination 1. US patent number 3007776, CL. 23--201, 1961. 2. US patent X 3787558, cl. 423-164, 1969.