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Technology for producing boracic acid and monohydrate magnesium sulfate by employing ascharite ore sulfuric acid process

A technology of magnesium sulfate and sulfuric acid method, applied in the direction of magnesium sulfate, boron oxide, etc., can solve the problems of waste of boric acid and magnesium sulfate resources, large equipment investment, low energy consumption, etc., achieve obvious energy saving effect, reduce sulfuric acid consumption, improve The effect of economic benefits

Inactive Publication Date: 2008-05-21
李皛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of discharge of mother liquor not only wastes boric acid and magnesium sulfate resources in the mother liquor, but also causes environmental pollution
There are also individual manufacturers who use the method of evaporating and concentrating the mother liquor to recover the mixed salt of boric acid and magnesium sulfate, and then obtain boric acid and magnesium sulfate heptahydrate through flotation. This method requires large equipment investment, high energy consumption, high cost, and low benefit, so it cannot be widely used.
At present, there is no record of the new process of recovering and producing boric acid and magnesium sulfate in boric acid mother liquor with small equipment investment, low energy consumption and low cost.

Method used

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  • Technology for producing boracic acid and monohydrate magnesium sulfate by employing ascharite ore sulfuric acid process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 20 kilograms of boric acid mother liquor, 4 kilograms of washing water, sample and test MgSO after mixing 4 ·7H 2 oContent 18.32%, H 3 BO 3 Content 2.83%. Weigh 40 mesh 6 kg of boron-magnesium ore powder produced in Tibet, sample and test for MgO content of 17.38%, CaO content of 6.42%, B 2 O 3 Content 32.06%. Weigh 2.4 kg of industrial grade 93% sulfuric acid.

[0017] Pour 24 kg of the mixed mother liquor washing water into the acidolysis tank, heat it to about 40 ° C, start stirring, slowly add sulfuric acid and mineral powder, and continue to heat, and be careful not to overflow the pot during operation. Until the sulfuric acid and mineral powder are added, the temperature is raised to 95°C for reaction for 2 hours, then filtered, the filter residue is discarded, the acid hydrolyzed solution is poured into the magnesium extractor while it is still hot, and the machine port is closed. Heating and raising the temperature to 180°C under stirring conditions...

Embodiment 2

[0019] Weigh 44 kilograms of boric acid mother liquor, 6 kilograms of washing water, sample and test MgSO after mixing 4 ·7H 2 O content 17.36%, H 3 BO 3 Content 2.85%. Weigh 40 mesh and 14 kg of boron-magnesium ore powder produced in Tibet, take samples and test for MgO content of 17.38%, CaO content of 6.42%, B 2 O 3 Content 32.06%. Weigh 5.3 kg of industrial grade 93% sulfuric acid.

[0020] A total of 50 kg of the mixed mother liquor washing water was poured into the acidolysis tank, heated to about 40 ° C, started to stir, slowly added sulfuric acid and mineral powder and continued to heat. The temperature was raised to 95°C and reacted for 2 hours, then filtered, the filter residue was discarded, the acid hydrolyzed solution was poured into the magnesium extractor while hot, the machine port was closed, the temperature was raised to 170°C under stirring conditions, the constant temperature was maintained for 7 hours, and the pressure was discharged. Immediately fi...

Embodiment 3

[0022] Weigh 42 kilograms of boric acid mother liquor, 8 kilograms of washing water, sample and test MgSO after mixing 4 ·7H 2 O content 14.16%, H 3 BO 3 Content 2.72%. Weigh 20 kilograms of boron-magnesium ore powder produced in Qinghai Chaidan, sample and test the MgO content of 16.22%, B 2 O 3 The content is 15.68%, and the amount of CaO is negligible. Weigh 5.8 kg of industrial grade 93% sulfuric acid.

[0023] Pour 50 kg of the mixed mother liquor washing water into the acidification tank and heat to about 40°C. Gradually add sulfuric acid and mineral powder under stirring and continue to heat until the mineral powder and sulfuric acid are added. The temperature was raised to 95°C for 1.5 hours. Then filter, discard the filter residue, put the acid hydrolyzed solution into the magnesium extractor while it is still hot, close the machine port, start stirring, slowly heat up to 190°C, keep the temperature constant for 6 hours, discharge the steam to release the pres...

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Abstract

The invention relates to a technique for preparing boracic acid and magnesium sulfate monohydrate by utilizing ascharite sulfuric acid process. The method drives mother liquid and washing water to be heated to have acidolysis with ascharite powder and sulfuric acid when returned to an acidolysis tank; acid decomposing liquid is pumped into a magnesium extracting machine after filtering while hot; temperature in the magnesium extracting machine is raised and crystal magnesium sulfate monohydrate is separated out at a constant temperature while the boracic acid stays in liquid phase and magnesium sulfate monohydrate products are obtained after filtering and drying while hot. Filtrate is pumped into a boracic acid crystallizer and cooled to crystallize according to a well-known way and boracic acid products are obtained after centrifugal separation, washing with added water and drying. The mother liquid and washing water of the boracic acid return to acidolysis process for reusing. The invention solves the problem that a large discharge amount of mother liquid of the boracic acid is changed to be completely recycled. About a ton of magnesium sulfate monohydrate and 200 kilograms of boracic acid can be recycled from the mother liquid in production of each ton of boracic acid. The invention saves resources, reduces environmental pollution and promotes economic benefit of enterprises, thus being characterized by little investment, low energy consumption, low cost and high benefit.

Description

technical field [0001] The invention belongs to a process method for producing boric acid and magnesium sulfate monohydrate by using a boron-magnesium ore sulfuric acid method, and is an improved technology for the existing boron-magnesium ore sulfuric acid one-step production process for boric acid. Background technique [0002] The existing one-step boric acid production process adopts the sulfuric acid method to process boron-magnesium ore to produce boric acid. The main technological process is: mixing boron-magnesium ore with sulfuric acid, adding water and heating for acidification, filtering, cooling and crystallization, centrifugal separation, washing with water, and drying to obtain boric acid product. One ton of boric acid product is produced by applying this process, and about 5-8 tons of mother liquor is produced, and the mother liquor contains about 3% to 7% of boric acid and 18% to 26% of magnesium sulfate. A small amount of mother liquor is used in the proces...

Claims

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Application Information

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IPC IPC(8): C01B35/10C01F5/40
Inventor 李皛马重华李昆峰
Owner 李皛
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