SU1604739A1 - Method of producing magnesium sulfate - Google Patents

Abstract

The invention relates to the chemical industry and is intended to produce magnesium sulphate. The purpose of the invention is to reduce iron in the target product. With this chain, iron sulfate is added to the hypomagnesia mixture obtained by precipitation with lime from marine brines, the process is carried out to a pH of 8.5-9.5, and then sodium carbonate is added. The iron content in the resulting product is 0.008-0.0001%, 1C. f-ly, 1 tab.

Description

one

(21) 4349940 / 31-26

(22) 12/28/87

(46) 07.11.90, Bull. № 41

{71) Institute of Physics and Chemistry

them. A. V. Bogatsky

(72) M. I. Sychev and A. M. Andrianov

(53) 661.846 (088.8)

(56) USSR author's certificate

№ 812714, cl. C 01 F 5/10, 1981.

Patent Czechoslovakia number 223099, cl. C 01 F 5/40, 1982.

(54) METHOD FOR PRODUCING MAGNESIUM SULPHATE

(57) The invention relates to the chemical industry and is intended for the production of magnesium sulphate. The purpose of the invention is to reduce the iron content in the target product. For this purpose, iron sulfate is added to the hypomagnesia mixture obtained by precipitation with lime from marine brines, the process is conducted from pH 8.5-9.5, and then sodium carbonate is added. The iron content in the resulting product is 0.008-0.0001%, 1 h. the item f., 1 tab.

The invention relates to chemical technology of inorganic substances, in particular to a method for producing magnesium sulphate.

The purpose of the invention is to reduce the iron content in the target product.

The method is carried out as follows.

While mixing ferrous sulphate, the gypsum-magnesia mixture obtained by precipitating with lime from sea brine is added with stirring until the pH of the suspension is 8.5-9.5.

After that, the sodium carbonate solution is added to the suspension in an amount that provides the mass ratio of Na2CO3: FeSO4: 50-100 in the mixture, stirred for 20 minutes, and the magnesium sulfate solution is filtered off.

In the resulting magnesium sulfate solution, the iron content is less than 0.008% by weight.

Example. To a solution with a volume of 450 ml and containing 100 g of ferrous sulfate, a hypomagnesia mixture in the amount of 85 g and containing 17 g of Mg (OH) 2 and 56 g of CaSO4 was added with stirring.

After 30 minutes, the hypsomagnesia mixture was again added to the reaction volume with stirring until the pH of the suspension reached 9.5, after which a solution containing 5 g of sodium carbonate was added to the suspension. After stirring the mixture for 20 minutes, the magnesium sulfate solution was separated by filtration.

The resulting solution contains 2.98% Mg (or 4.82% MgO) iron and manganese - less than 0.0001%, CaO 0.26%, B2O3 0.01%, SiOg less than 0.001 wt.%.

The results of the other examples are presented in the table.

As can be seen from the table, carrying out the process under the conditions of the proposed method provides a significant reduction in the iron content in the target product to 0.008-0,0001 wt.% Versus 2.16% by a known method.

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Claims (2)

1. A method of producing magnesium sulphate by reacting iron sulphate with a magnesium-containing raw material, characterized in that, in order to reduce the iron content in the target product, the hypothesis is used as the magnesium-containing raw material. 8 (good) 8.0 8.5. 9.0 9.5 10.0 8.5 8.5 PH value is missing the comagnese mixture obtained by precipitation with lime from sea brine, the reaction being carried out until a pH of 8.5-9.5 is reached and a solution of sodium carbonate is introduced into the suspension. 2. A method according to claim 1, characterized in that the sodium carbonate is introduced in a mass ratio to ferric sulfate 1: (50-100). 50 50 100 100 100 40 110 is present 2 o .0 0,008 O, 0001 0.0001 0.0001 0.8 0,002 2.16