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Method for recycling potassium from industrial raffinate containing potassium

A tail liquid and industrial technology, applied in the field of potassium recovery, can solve problems such as destroying ecological balance and environmental pollution, and achieve the effects of reducing pollution and waste, simple process and low cost

Active Publication Date: 2018-05-11
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At the same time, a large amount of untreated water, gas, slag and other harmful wastes are discharged in industrial production, such as the preparation of potassium nitrate by potassium chloride and sodium nitrate and the preparation of magnesium nitrate by magnesium chloride and ammonium nitrate. The tail liquid will seriously destroy the ecological balance, cause environmental pollution, and have a serious impact on human survival and development; according to the national energy conservation and emission reduction requirements, it is necessary to save energy, reduce energy consumption, and reduce pollutant emissions

Method used

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  • Method for recycling potassium from industrial raffinate containing potassium
  • Method for recycling potassium from industrial raffinate containing potassium

Examples

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Effect test

Embodiment 1

[0045] The method for reclaiming potassium from the potassium-containing industrial tail liquid of the present embodiment may further comprise the steps:

[0046] In step S1, the potassium-containing industrial tail liquid is evaporated in a salt field to obtain a solid ore containing potassium, ammonium and magnesium.

[0047] Specifically, the main chemical composition of the solid ore is: the content of potassium ions is 5.1%, the content of ammonium ions is 1.0%, the content of magnesium ions is 9.5%, and the content of chloride ions is 35.2%; the composition of the solid ore is ammonium light halide Stone, carnallite and bischofite, and a small amount of sand and gypsum.

[0048] In step S2, the solid ore is taken out from the salt pan, crushed and passed through a 40-mesh sieve, and the first sieve is taken for later use.

[0049] In step S3, the first undersize and fresh water are mixed in a mass ratio of 2:1, and stirred at 0°C for 16 hours to fully decompose, and the...

Embodiment 2

[0053] The method for reclaiming potassium from the potassium-containing industrial tail liquid of the present embodiment may further comprise the steps:

[0054] In step S1, the potassium-containing industrial tail liquid is evaporated in a salt field to obtain a solid ore containing potassium, ammonium and magnesium.

[0055] Specifically, the main chemical composition of the solid ore is: the content of potassium ions is 5.9%, the content of ammonium ions is 1.4%, the content of magnesium ions is 10.0%, and the content of chloride ions is 37.1%; the composition of the solid ore is ammonium light halide Stone, carnallite and bischofite, and a small amount of sand and gypsum.

[0056] In step S2, the solid ore is taken out from the salt pan, crushed and passed through a 40-mesh sieve, and the first sieve is taken for later use.

[0057] In step S3, the first undersize and fresh water are mixed according to the mass ratio of 10:7, and stirred at 25°C for 4 hours to fully deco...

Embodiment 3

[0061] The method for reclaiming potassium from the potassium-containing industrial tail liquid of the present embodiment may further comprise the steps:

[0062] In step S1, the potassium-containing industrial tail liquid is evaporated in a salt field to obtain a solid ore containing potassium, ammonium and magnesium.

[0063] Specifically, the main chemical composition of the solid ore is: the content of potassium ions is 5.6%, the content of ammonium ions is 1.2%, the content of magnesium ions is 9.8%, and the content of chloride ions is 36%; the composition of the solid ore is ammonium light halogen Stone, carnallite and bischofite, and a small amount of sand and gypsum.

[0064] In step S2, the solid ore is taken out from the salt pan, crushed and passed through a 40-mesh sieve, and the first sieve is taken for later use.

[0065] In step S3, the first undersize and fresh water are mixed according to a mass ratio of 5:3, and stirred at 10°C for 8 hours to fully decompose...

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Abstract

The invention provides a method for recycling potassium from industrial raffinate containing potassium. The industrial raffinate containing potassium is the mixed raffinate generated in the process ofproducing potassium nitrate and magnesium nitrate. The method includes the steps of conducting salt pan evaporation on the industrial raffinate containing potassium to obtain solid ore containing potassium, ammonium and magnesium; crushing and sieving the solid ore containing potassium, ammonium and magnesium to obtain first sieved substances; blending the first sieved substances with water according to a mass ratio of 100:(50-70), fully decomposing the mixture, and then adopting a 40-80-mesh sieve for conducting wet sieving and solid-liquid separation to obtain second sieved objects; conducting flotation on the second sieved objects once, and then conducting washing, solid-liquid separation and drying on correspondingly obtained flotation concentrates to obtain a potassium chloride product. According to the compositions of the industrial raffinate containing potassium, a technology for salt pan evaporation, decomposition, sieving and flotation is made for preparing potassium chloride, obtained potassium chloride can be used as the raw material for production, the whole technology is simple in process and low in cost, the utilization problem of potassium is solved, and the resource utilization rate is effectively increased.

Description

technical field [0001] The invention belongs to the technical field of inorganic / salt lake chemical industry, and in particular relates to a method for recovering potassium from potassium-containing industrial tail liquid. Background technique [0002] Potassium chloride is mainly used in the inorganic industry. It is the basic raw material for the manufacture of various potassium salts or alkalis such as potassium hydroxide, potassium sulfate, potassium nitrate, potassium chlorate, and potassium alum. For example, it is used as a diuretic in the pharmaceutical industry and prevents potassium deficiency. In the dye industry, it is used to produce G salt, reactive dyes, etc.; in agriculture, it is used as potassium fertilizer, which has a fast fertilizer effect and is directly applied to farmland, which can increase the moisture in the lower layer of the soil and have the effect of drought resistance. But in saline-alkali land and tobacco , sweet potato, sugar beet and other ...

Claims

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Application Information

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IPC IPC(8): C01D3/06
Inventor 杨红军王敏钟远
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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