SU1511292A1 - Method of extracting boron from magnesium sulfate solutions - Google Patents

Abstract

The invention relates to the field of technology and can be used in the preparation of boron magnesium compounds by electrolysis of aqueous magnesium-containing solutions used as a thermal insulation coating on transformer steel. The purpose of the invention is to increase the degree of boron recovery and to obtain sulfuric acid, which is achieved by removing the extractor in a diaphragm electrolyzer by feeding magnesium sulphate solution into the anode and cathode spaces at the flow rate of the solution through the diaphragm from the cathode space into the anode 5-7 x 10 ^-3 L / ^A. h. 1 tab.

Description

The invention relates to boron technology and can be used in the preparation of boromagnium compounds by electrolysis of aqueous magnesium-containing solutions used as a thermal insulation coating on transformer steel.

The purpose of the invention is to increase the degree of boron recovery and the production of sulfuric acid.

The essence of the method is as follows.

Extraction of β-boron from magnesium sulphate solutions containing boron is carried out in a continuous-cell electrolyzer with a flow-through diaphragm with lead anodes and cathodes of I2X18H10T stainless steel at a current density of I500 A / m, a temperature of 60-65 ° C and a flow rate of solution through diaphragm 5-7x10 l / A h, during electrolysis at the anode there is

oxygen, hydrogen at the cathode, Hydroxide ions form magnesium hydroxide with magnesium ions. Boron contained in the solution is easily sorbed by magnesium hydroxide. The boron-containing magnesium hydroxide slurry containing boron is removed from the cathode space by a flow of electrolyte circulating between the cathode space of the electrolyzer and the settling tank. In the process of electrolysis, along with the formation of magnesium hydroxide in the anode space, the formation of sulfuric acid occurs. The research results showed that the effect achieved (in terms of boron extraction) is due to the increased sorption capacity of magnesium hydroxide obtained by an electrochemical method.

Experimental data have shown that the optimal speed of solution flow through the diaphragm is

ate

to

with

N3

31511

5-7x10 l / A, At the speed of the flow of the solution above and below the specified limits, the target is not reached.

Example 1. In the electrolysis process, the solution flows through the diaphragm at a speed of 4x from the cathode space to the anode one. The concentration of sulfuric acid in the anolyte 170 g / l. The degree of extraction of boron in the solid product (magnesium hydroxide) is 92%,

Example 2. Unlike Example 1, the flow rate of the solution through the q1 aphragm is 5x10. The concentration of sulfuric acid in the anolyte is 165 g / l. The degree of extraction of boron in the solid product is 98.5%,

Example 3. In contrast to the examples, 1 and 2, the speed of the flow of solution through the diaphragm is 7x

chio l / Ah Sulfuric acid concentration in anolyte is 160 g / l. The degree of boron ingestion into a solid product is 99%,

Example 4. In contrast to Examples 1-3, the flow rate of the solution through the diaphragm is 8x, 10 liters / The concentration of sulfuric acid in the anolyte is 120, g / l. The degree of extraction of boron in a solid product is 80%,

The closest in technical essence to the present invention is with (1 method of cleaning highly mineralized | natural solutions from boron, based on sorption extraction of boron from solutions.

The table presents data characterizing the degree of boron recovery from the magnesium sulfate solution, the content of the boron, and the sorption capacity.

Mg (OH), depending on the method of obtaining magnesium hydroxide,.

0

five

five

0

five

40

From the data of the table it follows that the degree of extraction of boron depends on the sorption capacity. Mg (OH), It is shown that the sorption capacity. MgCOK), obtained by the electrochemical method, is much higher than the chemical (by a known method).

Technical and economic effect of the proposed method is due to the increase in the degree of extraction of boron to 98., 5-99% against 93% by a known method and the production of commercial sulfuric acid.

Claims (1)

Invention Formula The method of extracting boron from magnesium sulphate solutions, that is, in order to increase the degree of boron extraction and sulfuric acid, the extraction is carried out by electrolysis in a diaphragm electrolyzer with feeding of magnesium sulphate solution into the anode and the cathode space at the rate of flow of the solution through the diaphragm from the cathode space to the anode 5-710 l / Ah.