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

A separation method and magnesium sulfate technology, applied in the field of borate, can solve problems such as the absence of ideal mature methods, unacceptable production enterprises, and impact on boric acid production costs, and achieve reasonable technical route design, low production energy consumption, and environmental protection effects Good results

Inactive Publication Date: 2009-04-15
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

Benefits of technology

This new method described by this inventors allows for better separation between different metals like iron (Fe), calcium or beryllium while also making it easier to recover these materials from their original sources without generating dangerous gases during manufacturing processes.

Problems solved by technology

This patented technical solution describes various methods or techniques that aim at extracting valuable metals from bovine liths while minimizing contamination issues associated therewith during processing steps such as extraction processes. However, these existing solutions involve expensive materials like calcium hydroxide and magnetic powder, leading to increased costs compared to traditional salt decomposition/elution methods due to their complex nature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 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 is used as agricultural. 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

[0016] 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

[0018] 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, and 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 O 72.6%. This acid compound is used as the material for the separation of boron and magnesium in the boric acid production mother liquor.

[0019] 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 t...

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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 the sheet 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

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Claims

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Application Information

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Owner 大连市中山区鑫阳矿业化工研究所
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