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Comprehensive utilization process for magnesium sulfate

A magnesium sulfate and process technology, applied in the direction of calcium/strontium/barium sulfate, magnesium hydroxide, chemical instruments and methods, etc., can solve problems such as difficult operation control, high equipment requirements, and large heat consumption, and achieve simple process, The effect of high product purity and low production cost

Inactive Publication Date: 2013-07-24
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process adopts the method of pressurized carbonization to realize the separation of calcium and magnesium, which requires high equipment and difficult operation and control; in addition, because the concentration of magnesium bicarbonate solution obtained by carbonization is very low, the pyrolysis process consumes a lot of heat energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Take 500 mL of magnesium sulfate solution with a concentration of 0.8 mol / L and place it in a reaction tank, heat it to 65° C., keep the temperature constant, and add 0.7 g of calcium sulfate seed crystals. Under the condition of constant temperature and stirring, 333 mL of milk of lime with a concentration of 1.2 mol / L was gradually added to carry out the synthesis reaction, and the time of adding milk of lime was 4 hours. Continue stirring at constant temperature for 0.5 h after the dropwise addition. A suspension containing mixed precipitates of magnesium hydroxide and calcium sulfate was obtained.

[0023] b. Add a small amount of dilute sulfuric acid to the suspension obtained in step a above to adjust the pH value to 8.5. 0.33 g of sodium silicate, 0.045 g of sodium lauryl sulfate were added to the suspension. After mixing evenly, put it in the flotation tank of the flotation machine for flotation separation, the stirring rate is 800r / min, and the air speed i...

Embodiment 2

[0025] a. Take 500 mL of magnesium sulfate solution with a concentration of 1.1 mol / L and place it in a reaction tank, heat it to 75° C., keep the temperature constant, and add 1.9 g of calcium sulfate seed crystals. Under constant temperature and stirring conditions, 367 mL of milk of lime with a concentration of 1.5 mol / L was gradually added to carry out the synthesis reaction, and the time for adding milk of lime was 3 hours. Continue stirring at constant temperature for 1.5 h after the dropwise addition. A suspension containing mixed precipitates of magnesium hydroxide and calcium sulfate was obtained.

[0026] b. Add a small amount of dilute sulfuric acid to the suspension obtained in step a above to adjust the pH value to 8.7. 0.44 g of carboxymethylcellulose and 0.038 g of dodecyl ammonium acetate were added to the suspension. After mixing evenly, put it in the flotation tank of the flotation machine for flotation separation, the stirring rate is 1000r / min, and the ai...

Embodiment 3

[0028] a. Take 500 mL of magnesium sulfate solution with a concentration of 1.3 mol / L and place it in a reaction tank, heat it to 55° C., keep the temperature constant, and add 3.4 g of calcium sulfate seed crystals. Under constant temperature and certain stirring conditions, 361 mL of milk of lime with a concentration of 1.8 mol / L was gradually added to carry out the synthesis reaction, and the time for adding milk of lime was 1 hour. Continue stirring at constant temperature for 2 h after the dropwise addition. A suspension containing mixed precipitates of magnesium hydroxide and calcium sulfate was obtained.

[0029] b. Add a small amount of dilute sulfuric acid to the suspension obtained in step a above to adjust the pH value to 8.9. Add 0.51 g of soluble starch and 0.048 g of sodium dodecylbenzenesulfonate to the suspension. After mixing evenly, put it in the flotation tank of the flotation machine for flotation separation, the stirring rate is 1050r / min, and the air sp...

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PUM

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Abstract

The invention discloses a comprehensive utilization process for magnesium sulfate. The process specifically comprises the following steps of: reacting magnesium sulfate solution with lime milk under certain conditions to generate magnesium hydroxide and calcium sulfate mixture precipitate; growing magnesium hydroxide grains by controlling reactive crystallization conditions; adjusting pH value ofmixture suspension, and adding an inhibitor and a collector to perform flotation separation; and filtering and drying the magnesium hydroxide suspension and calcium sulfate suspension which are subjected to the flotation separation to obtain a magnesium hydroxide product and a calcium sulfate product respectively. The process has the advantages of environmental friendliness, simple process, shortflow, low production cost, complete calcium-magnesium separation, high product purity, wide application range, flexible and adjustable product scheme and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a comprehensive utilization process of magnesium sulfate, in particular to a process for preparing magnesium hydroxide and calcium sulfate products from magnesium sulfate and milk of lime as raw materials. Background technique [0002] Magnesium sulfate is an important magnesium-containing raw material, and its sources are very extensive. For example, the mother liquor of magnesium sulfate produced by the sulfuric acid method to produce boric acid, the by-product of titanium dioxide produced by the acid method, the by-product magnesium sulfate in the non-ferrous metallurgical industry, and the by-product magnesium sulfate in the magnesium desulfurization of power plants. The comprehensive utilization of these by-product magnesium sulfate is not only an environmental protection requirement for emission reduction and harm reduction, but also can produce useful chemical produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J14/00C01F5/22C01F11/46
Inventor 刘宝树孙华宋丽英何岩徐欢欢
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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