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Method for recovering boron and magnesium from calcium magnesium dreg in boron-containing brine

A calcium-magnesium slag and boron-magnesium technology, which is applied in the field of boron-magnesium recovery from calcium-magnesium slag in boron-containing brine, can solve problems such as unsuitable industrial application and compositional differences of calcium-magnesium slag, and achieve high recovery value, cost saving, and simple reaction principle Effect

Active Publication Date: 2017-02-15
四川恒成钾盐科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the composition difference of calcium magnesium slag and the limitation of external conditions, none of the three processes can be applied industrially.

Method used

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  • Method for recovering boron and magnesium from calcium magnesium dreg in boron-containing brine

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Take 20L of brine, heat it to 50°C and keep it warm, add milk of lime with a mass concentration of 20% to the brine, adjust the pH of the solution to 10.4, add the milk of lime for 2 hours, and age for 2 hours after adding the milk of lime. After 15ml of flocculant was left to settle for 30 minutes, the upper layer was cleared away, and the lower layer was filtered and separated by a vertical plate and frame filter press to obtain coarse calcium and magnesium slag. The filter cake was washed with 2000ml of fresh water at 60°C for several times , to obtain calcium magnesium slag.

[0030] Add the obtained calcium-magnesium slag into 1+1 sulfuric acid under stirring conditions, and the addition time is 1 hour, so that the pH of the solution reaches 6.5, and then take an appropriate amount of calcium-magnesium slag slurry and add it to the acidified slurry, slowly adjusting to The pH of the solution is 7.5, the precipitate is filtered to obtain crude calcium sulfate, the f...

Embodiment 2

[0033] Take 25L of brine, heat it to 55°C and keep it warm, add milk of lime with a mass concentration of 25% to the brine, adjust the pH of the solution to 11, add the milk of lime for 1 hour, and age for 1.5 hours after adding the milk of lime. After 20ml of flocculant was left to settle for 60 minutes, the upper layer was cleared away, and the lower layer was filtered and separated by a vertical plate and frame filter press to obtain coarse calcium and magnesium slag. The filter cake was washed with 2500ml of 80°C fresh water for several times , to obtain calcium magnesium slag.

[0034] Add the obtained calcium-magnesium slag to 1+1 sulfuric acid under stirring conditions, and the addition time is 1.5 hours, so that the pH of the solution reaches 6.5, and then take excess calcium-magnesium slag and add it to the acidified slurry, and slowly adjust to the solution pH to 7.2, the precipitate is filtered to obtain crude calcium sulfate, the filtrate is evaporated and concentr...

Embodiment 3

[0037] Take 30L of brine, heat it to 60°C and keep it warm, add milk of lime with a mass concentration of 20% to the brine, adjust the pH of the solution to 12, add the milk of lime for 1 hour, and age for 2 hours after adding the milk of lime. After 25ml of flocculant was left to settle for 2 hours, the upper layer was cleared away, and the lower layer of slurry was filtered and separated by a vertical plate and frame filter press to obtain coarse calcium and magnesium slag. The filter cake was rinsed with 3000ml of fresh water at 60°C for several times. Wash to get calcium and magnesium slag.

[0038] Add the obtained calcium-magnesium slag to 1+1 sulfuric acid under stirring conditions, and the addition time is 1 hour to make the pH of the solution reach 6.5. 8. Filter the precipitate to obtain crude calcium sulfate, evaporate and concentrate the filtrate, when the mass concentration of magnesium ions in the filtrate reaches 120g / l, naturally cool the filtrate to normal tem...

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Abstract

The invention discloses a method for recovering boron and magnesium from a calcium magnesium dreg in boron-containing brine, and the method comprises the following steps: a) preparing a crude calcium magnesium dreg containing boron under suitable conditions, and washing the crude calcium magnesium dreg with a mother liquid displacement method to obtain a boron-containing washed calcium magnesium dreg; b) performing acidolysis on the boron-containing washed calcium magnesium dreg under acidic conditions to obtain a boron and magnesium-containing acidolysis solution and crude calcium sulfate; c) performing evaporation and concentration and cooling crystallization on the boron and magnesium-containing acidolysis solution to obtain an epsom salt product and magnesium precipitation mother liquor; and d)adding an acid into the magnesium precipitation mother liquor for acidification to obtain crude boric acid, and refining the crude boric acid to obtain a boric acid product. The processing method has the advantages of simple reaction principles of each step and easy operation processes, and can realize industrialized production.

Description

technical field [0001] The invention relates to the technical fields of salt chemical industry and environmental protection, in particular to a method for recovering boron and magnesium from calcium and magnesium slag in boron-containing brine. Background technique [0002] Brine is an important chemical raw material, its composition is complex, and the content of impurities in different brines varies from place to place, and these impurities will have a greater adverse effect on subsequent production. In order to improve the quality of salt, prolong the service life of equipment, and reduce production energy consumption, most enterprises purify brine to remove calcium and magnesium ions in brine. The removal methods mainly include lime-soda ash method, lime-flue gas method, soda ash-caustic soda method, etc. The muddy mixture formed by calcium carbonate, calcium sulfate, magnesium hydroxide and brine during the brine purification process is naturally boron-containing Magne...

Claims

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Application Information

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IPC IPC(8): C01B35/10C01F5/40C01F11/46
CPCC01B35/1045C01F5/40C01F11/46
Inventor 唐兵安普伟王思相郑红英
Owner 四川恒成钾盐科技有限公司
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