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Method for separating boric acid and magnesium sulphate in boric acid production mother liquor by using magnesium sulphate

A technology of magnesium sulfate and magnesium sulfate heptahydrate, applied in the field of borate, can solve the problems of no ideal mature method, difficult to solve equipment anticorrosion, affecting the production cost of boric acid, etc., and achieves reasonable technical route design, low production energy consumption, Environmentally friendly effect

Inactive Publication Date: 2010-06-16
大连市中山区鑫阳矿业化工研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as CN 1097810A; CN 1039112C; Xu Ning etc., the separation research (J) of magnesium sulfate in boric acid production mother liquor, chemical science and technology, 2003,11 (6): 30~33; CN 1251968C etc. all are to produce boric acid with different salts Although the salting-out method can significantly reduce the solubility of a component in the separated mixture, and it is easy to separate out, the large amount of salting-out agent dissolves without reducing the solute in the mother liquor, and the other ions brought in make it easy to separate. The mother liquor cannot be returned to the production process for recycling; and the corrosion of equipment is also a big problem
If sulfate is used as a salting-out agent, although other impurities will not be brought in, the anti-corrosion of its equipment is also difficult to solve
In addition, the purpose of recovering boron and magnesium is achieved through the evaporation and concentration of the mother liquor, which consumes a lot of energy and is difficult for manufacturers to accept.
[0003] There is still no ideal mature method for the treatment and utilization of boron ore production mother liquor, and this is also the biggest problem affecting the production cost of boric acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 1000Kg of mother liquor produced by boric acid into the reactor, heat up to 75-80°C, add 200Kg of magnesium sulfate monohydrate under stirring, keep the temperature at 75-80°C (the solubility of magnesium sulfate is the highest at this temperature) until it is completely dissolved, and then cool Lower the temperature to precipitate magnesium sulfate as magnesium sulfate heptahydrate. When the temperature drops to 20-25°C, the slurry is sent to the classifier, and the crystals of magnesium sulfate heptahydrate enter the centrifuge from the lower part of the classifier, and the sulfuric acid heptahydrate is separated by centrifugation. Magnesium 530kg as agricultural use. Due to its hydrophobicity, boric acid enters the settling tank from the upper part of the sub-machine to separate the mixture of boric acid and magnesium sulfate. Only 510kg of boric acid mother liquor remains, which is returned to the boric acid production process.

Embodiment 2

[0017] Add 1000Kg of boric acid production mother liquor into the reactor, heat up to 75-80°C, add 200Kg of magnesium sulfate under stirring to make it completely dissolve and then cool down. During the cooling process, magnesium sulfate heptahydrate gradually precipitates from the mother liquor. When the mother liquor temperature reaches At 20-25°C, the mother liquor slurry with magnesium sulfate heptahydrate crystals is sent to the classifier, and the magnesium sulfate heptahydrate crystals enter the centrifuge from the lower part of the classifier, and 650kg of magnesium sulfate heptahydrate is separated by centrifugation. The boric acid and magnesium sulfate floating on the upper part of the classifier are separated to obtain this mixture.

Embodiment 3

[0019] The acidified compound was prepared by the method described in ZL03101382.1. 13% B 2 o 3 Put 1000Kg of boron magnesium ore powder into the reactor, add 550Kg of boric acid mother liquor, add 640Kg of sulfuric acid (concentration 40-75%) under stirring to carry out acidification reaction, and the reaction temperature is controlled above 80°C, which is the magnesium and boron in the boric acid mother liquor Magnesium from magnesium ore produces magnesium sulfate monohydrate. After the reaction is completed, the acidified product becomes a dry powder after stacking and natural cooling, and its composition is B 2 o 3 5.41%, MgSO 4 ·H 2 O72.6%. This acid compound is used as the material for the separation of boron and magnesium in the boric acid production mother liquor.

[0020] Get 1000kg boric acid mother liquor (containing MgSO 4 24.0%, B 2 o 3 2.5%) into the reactor, heat up to 75-80°C, add 200kg of the above-mentioned acid compound under stirring, keep the rea...

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Abstract

The invention relates to a method for separating boric acid from magnesium sulfate in a boric acid-production mother liquor by using the magnesium sulfate, which comprises the steps: the boric acid-production mother liquor is heated up to 65-80 DEG C, magnesium salt is added under stirring, the temperature is preserved at 65-80 DEG C until the magnesium slat is dissolved completely, filtering is carried out by a sheet frame at 80 DEG C, filtrate becomes crystal mush containing crystal when being cooled, the crystal mush is sent to a boron-magnesium classificator for classifying, magnesium sulphata heptahydrate enters a centrifuge from the lower part of the classificator and is centrifugation separated out; and the floating mixture of the boric acid and the magnesium sulfate at the upper part of the classificator enters a settling tank for separation further to obtain a mixture containing about 60 percent of H3BO3, which is then refined to obtain boric acid product. The filtrate and thesheet frame return to boric acid production technology. The magnesium salt is the magnesium sulfate, monohydrate magnesium sulfate or the mixture thereof, or powder-shaped boron-magnesium acidification substance which contains the monohydrate magnesium sulfate and is generated by the reaction between boron-magnesium ore and sulfate, or magnesia, magnesite, brucite or the product which includes the monohydrate magnesium sulfate and is generated by the reaction between magnesium hydroxide and the sulfate.

Description

technical field [0001] The invention belongs to the technical field of borate, and also relates to the treatment technology of waste water in its production. Background technique [0002] The one-step method of producing boric acid uses sulfuric acid as a decomposing agent to treat boron ore to obtain boric acid, which has the advantages of short process, low investment, and simple operation. The mother liquor produced in this process technology contains about 3% boric acid. Because it also contains a large amount of magnesium sulfate, the mother liquor produced by boric acid is very large, and the production of one ton of boric acid is about 6-40M 3 . The early production mother liquor was all discharged, which not only polluted the environment, but also lost resources. About 25% of the boric acid was discharged with the waste water. In recent years, with the gradual depletion of boron resources and the requirements of environmental protection, many scientific research un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/10C01F5/40
Inventor 张有俊胡月阳孙德海
Owner 大连市中山区鑫阳矿业化工研究所