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Method for treating magnesium-containing waste liquid

A technology of waste liquid, magnesium sulfate, applied in the field of chemistry

Active Publication Date: 2017-08-29
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The calcium content of the magnesium carbonate product obtained by the existing process for treating magnesium-containing waste liquid exceeds the standard, so the existing technology for treating magnesium-containing waste liquid needs to be further improved

Method used

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  • Method for treating magnesium-containing waste liquid
  • Method for treating magnesium-containing waste liquid

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Embodiment

[0050] Mix 100g of magnesium-containing waste liquid with 30g of milk of lime to obtain a slurry containing magnesium hydroxide and calcium sulfate; then contact it with carbon dioxide and filter to obtain calcium sulfate and a post-reaction liquid containing magnesium bicarbonate and calcium bicarbonate , the content of magnesium in the liquid after the reaction is 10g / L, and the content of calcium is 0.5g / L, adding 4g concentration in the liquid after the reaction is the sodium hydroxide solution of 30wt%, allowing it to contain magnesium bicarbonate and carbonic acid The post-reaction solution of calcium hydrogen was reacted for 2 hours at 20 degrees Celsius. At this time, the dosage coefficient of sodium hydroxide was 1.5. After the reaction, calcium-containing slag and a decalcified and magnesium-containing post-liquid containing magnesium bicarbonate were obtained, wherein the calcium-containing slag It can be mixed with sulfuric acid solution and filtered to obtain dihyd...

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Abstract

The invention discloses a method for treating a magnesium-containing waste liquid. The method comprises the steps of (1) mixing the magnesium-containing waste liquid and lime milk to obtain slurry containing magnesium hydrate and calcium sulfate; (2) enabling the slurry containing the magnesium hydrate and the calcium sulfate to be in contact with carbon dioxide and then filtering to obtain calcium sulfate and an overflush liquid containing magnesium bicarbonate and calcium bicarbonate; (3) enabling the overflush liquid containing the magnesium bicarbonate and the calcium bicarbonate to be in contact with a calcium remover and then filtering to obtain calcium slag and a calcium-free magnesium-containing overflush liquid containing magnesium bicarbonate; and (4) pyrolyzing the calcium-free magnesium-containing overflush liquid containing the magnesium bicarbonate to obtain a magnesium carbonate product. According to the method, a calcium element in the magnesium carbonate product can be efficiently removed, and the condition that the calcium content in the magnesium carbonate product reaches the national standard is ensured.

Description

technical field [0001] The invention belongs to the field of chemistry, in particular, the invention relates to a method for treating magnesium-containing waste liquid. Background technique [0002] At present, in many industrial fields, a large amount of waste liquid containing magnesium is often produced. For example, acid leaching of magnesium-bearing ores in hydrometallurgical processes produces large quantities of solutions containing magnesium sulfate. Since magnesium sulfate, also known as "bitter water", is a toxic substance that can cause diarrhea in humans, the country prohibits the direct discharge of wastewater containing magnesium sulfate. [0003] The calcium content of the magnesium carbonate product obtained by the existing process for treating magnesium-containing waste liquid exceeds the standard, so the existing technology for treating magnesium-containing waste liquid needs to be further improved. Contents of the invention [0004] The present inventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/24
CPCC01F5/24C01P2006/80
Inventor 孙宁磊李明川王魁珽刘国彭建华
Owner CHINA ENFI ENGINEERING CORPORATION