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Method for treating waste liquid containing magnesium

A treatment method and technology of waste liquid, applied in the field of metallurgy, can solve the problems of difficult treatment and high moisture content, and achieve the effect of simple process, low cost and easy control

Active Publication Date: 2010-10-27
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the existence of a large amount of magnesium hydroxide precipitates, the water content is very high, which brings great difficulties to the subsequent treatment

Method used

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

Examples

Experimental program
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Effect test

example 1

[0033] Take 1L of magnesium-containing waste liquid, and use the ammonia method to precipitate magnesium to precipitate magnesium ions, and finally obtain a magnesium-precipitated liquid with a magnesium content of 10g / L. Add ammonium dihydrogen phosphate to the solution after magnesium precipitation, and react for 30 minutes at a temperature of 35°C and pH=9.1, filter out the magnesium ammonium phosphate precipitate, wash with water and dry at 50°C. Analyzing by a conventional method, the magnesium content in the filtrate obtained after filtering out the magnesium ammonium phosphate is 10 mg / L, and the magnesium precipitation rate is greater than 99%; the purity of the magnesium ammonium phosphate is greater than 99%.

[0034] Lime is added to the filtrate for causticizing to obtain gypsum and causticizing liquid. The causticized liquid is subjected to ammonia distillation operation, and the obtained ammonia water is returned for ammonia magnesium precipitation.

example 2

[0036] Take 1 L of magnesium-containing waste liquid, and use ammonium carbonate magnesium precipitation to precipitate magnesium ions therein, and finally obtain a magnesium content of 4 g / L after magnesium precipitation. Add ammonium dihydrogen phosphate to the magnesium-precipitated solution, react for 30 minutes at a temperature of 35°C and pH=8.5, filter out the magnesium ammonium phosphate precipitate, wash with water and dry at 50°C. Analyzing by a conventional method, the magnesium content in the filtrate obtained after filtering out the magnesium ammonium phosphate is 15 mg / L, and the magnesium precipitation rate is greater than 99%. The purity of magnesium ammonium phosphate is greater than 99%.

[0037] Lime is added to the filtrate for causticizing to obtain gypsum and causticizing liquid. The ammonia in the causticized liquid is converted into ammonium salt and returned for magnesium precipitation.

example 3

[0039] Take 1 L of magnesium-containing waste liquid, and use ammonium bicarbonate to precipitate magnesium ions to precipitate the magnesium ions therein, and finally obtain a magnesium-precipitated liquid with a magnesium content of 10 g / L. Add ammonium dihydrogen phosphate to the magnesium precipitation solution, react for 60 minutes at a temperature of 45°C and pH=8.2, filter out the magnesium ammonium phosphate precipitate, wash with water and dry at 80°C. Analyzing by a conventional method, the magnesium content in the filtrate obtained after filtering out the magnesium ammonium phosphate is 15 mg / L, and the magnesium precipitation rate is greater than 99%. The purity of magnesium ammonium phosphate is greater than 99%.

[0040] Lime is added to the above filtrate for causticizing to obtain. The ammonia in the causticized liquid is converted into ammonium salt and returned for magnesium precipitation.

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Abstract

The invention discloses a method for treating waste liquid containing magnesium. The method comprises the following steps of: performing impurity removal and purification on waste liquid containing magnesium to obtain dregs and purified liquid; performing magnesium precipitating on the purified liquid by using ammonia or ammonium salt to obtain magnesium product precipitate and magnesium precipitation liquid; and adding ammonium phosphate into the magnesium precipitation liquid for precipitation and filtration to obtain magnesium ammonium phosphate precipitate and filtrate. According to the method for treating waste liquid containing magnesium, magnesium ions which do not participate in the reaction can be thoroughly precipitated to obtain the high-quality magnesium ammonium phosphate used as a slow release fertilizer as the magnesium precipitation liquid is further treated by adopting the ammonium phosphate, thereby the full utilization of magnesium in the waste liquid is realized. In addition, the full precipitation of the magnesium in the waste liquid can avoid the lower gypsum purity caused by the formation of magnesium hydroxide when the gypsum is produced by using the magnesium precipitation liquid. By utilizing the method, the precipitation ratio of the magnesium ion in the waste liquid containing magnesium can reach more than 99 percent; and the method has simple process, easy control and low cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a treatment method for magnesium-containing waste liquid produced by cobalt-nickel wet production. Background technique [0002] In the field of metallurgy, the acid leaching process is a commonly used method for extracting valuable metals. When producing cobalt-nickel or other valuable metals, the acid leaching process is usually used to leach the cobalt-nickel and other valuable metals in the ore, and at the same time, the impurities such as magnesium and manganese associated with the cobalt-nickel are also leached. Subsequently, the leaching solution is purified and removed to precipitate cobalt and nickel, and the cobalt and nickel solution obtained in this way contains a large amount of magnesium and a small amount of impurities such as manganese, which is usually called magnesium-containing waste solution. In addition, since an excess amount of acid needs to be used in ...

Claims

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Application Information

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IPC IPC(8): C01B25/45C01F11/46C05B17/00
Inventor 刘金山孙宁磊殷书岩王魁珽陆业大
Owner CHINA ENFI ENGINEERING CORPORATION
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