Method and system for removing fluorine and/or chlorine from sulfate solution through flash evaporation

A sulphate and flash evaporation technology, which is applied in chemical instruments and methods, flash evaporation, copper sulfate, etc., can solve problems such as the difficulty in realizing the resource utilization of fluorine and chlorine, the difficulty in meeting the requirements of the hydrometallurgy system, and the inability to achieve simultaneous removal, etc. Achieve the effect of environmental friendliness, less investment in equipment, and low cost of removal

Active Publication Date: 2021-11-26
JIANGXI UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

Although these methods can remove chloride ions or fluoride ions in the solution to a certain extent, there are still many disadvantages, such as long process, high cost, low removal rate, etc., especially, these methods can only target a single The fluorine or chlorine ions in the mixed solution of fluorine and chlorine usually need to be removed step by step, and simultaneous removal cannot be achieved
In addition, the existing methods cannot enrich fluorine and chlorine after separation, so it is difficult to realize resource utilization of fluorine and chlorine
Therefore, the existing fluorine and chlorine removal methods are difficult to meet the needs of the hydrometallurgy system, and the industry urgently needs a low-cost, high-efficiency method that can simultaneously remove fluorine and chlorine

Method used

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  • Method and system for removing fluorine and/or chlorine from sulfate solution through flash evaporation

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Embodiment 1

[0046] Taking the removal of fluorine and chlorine in copper sulfate solution (Cu:84.4g / L; F:127.2mg / L; Cl:3.9g / L, pH=4.2) as an example, first add sulfuric acid to the copper sulfate solution to adjust the acidity of the solution (Referring to the concentration of sulfuric acid in the mixed solution) is 13.1g / L, after mixing evenly, pump it into the high-pressure plate heat exchanger with a high-pressure pump, control the flow rate to 4.2L / min, and ensure that the temperature of the copper sulfate solution at the outlet is 180±3 ℃, and then introduced into the preheated flash evaporation chamber. When performing flash evaporation, it is necessary to maintain the temperature of the volatilization chamber at 120°C and the pressure at 600-800Pa. After the flash evaporation is completed, copper sulfate crystalline slag can be obtained at the bottom of the flash reactor, and the crystalline slag is collected and sampled for analysis of fluorine and chlorine content. The fluorine ...

Embodiment 2

[0052] Taking the removal of fluorine and chlorine in zinc sulfate solution (Zn: 162.7g / L; F: 1207.8mg / L; Cl: 3.1g / L, pH=4.6) as an example, first add sulfuric acid to the copper sulfate solution to adjust the acidity of the solution After mixing evenly, pump it into the high-pressure plate heat exchanger with a high-pressure pump, control the flow rate to 4.5L / min, ensure that the temperature of the copper sulfate solution at the outlet is 210±3°C, and then introduce it into the preheated flash evaporation chamber. When performing flash evaporation, it is necessary to maintain the temperature of the volatilization chamber at 130°C and the pressure at 300-500Pa. After the flash evaporation is completed, zinc sulfate crystalline slag can be obtained at the bottom of the flash reactor, and the crystalline slag is collected and sampled for analysis of fluorine and chlorine content. The fluorine content in the zinc sulfate crystal slag is less than 1ppm, and the chlorine content ...

Embodiment 3

[0058] Taking the removal of fluorine and chlorine in nickel sulfate solution (Ni:92.4g / L; F:2415.4mg / L; Cl:1.4g / L, pH=2.5) as an example, first add sulfuric acid to the copper sulfate solution to adjust the acidity of the solution After mixing evenly, pump it into the high-pressure plate heat exchanger with a high-pressure pump, control the flow rate to 2.7L / min, ensure that the temperature of the copper sulfate solution at the outlet is 180±3°C, and then introduce it into the preheated flash evaporation chamber. When performing flash evaporation, it is necessary to maintain the temperature of the volatilization chamber at 120°C and the pressure at 400-600Pa. After the flash evaporation is completed, nickel sulfate crystalline slag can be obtained at the bottom of the flash reactor, and the crystalline slag is collected and sampled for analysis of fluorine and chlorine content. The fluorine content in the nickel sulfate crystal slag is less than 1ppm, and the chlorine conten...

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Abstract

The invention relates to a method for removing fluorine and/or chlorine from a sulfate solution through flash evaporation, and belongs to the field of nonferrous metallurgy. According to the method, an acidic transition metal sulfate solution containing fluorine and chlorine is heated to a high-temperature and high-pressure state; the acidic transition metal sulfate solution is introduced into a flash evaporation volatilization chamber for instantaneous pressure relief, so that water, fluorine and chlorine are evaporated to enter a gas phase, and other substances enter a slag phase in the form of sulfate crystals, and therefore, efficient and synchronous separation of fluorine, chlorine and transition metal is realized, and a sulfate crystal product with low fluorine and chlorine content is obtained when the fluorine and chlorine impurities are removed. The method has the advantages of simple process, high adaptability, low cost and high fluorine and chlorine impurity removal efficiency, and has a relatively good industrial application prospect.

Description

technical field [0001] The invention relates to a method for removing fluorine and / or chlorine by flash evaporation from a sulfate solution, belonging to the field of nonferrous metallurgy. [0002] technical background [0003] Fluorine and chlorine are extremely harmful impurities to the hydrometallurgy system based on sulfuric acid extraction. Excessive fluorine and chloride ion content not only lead to serious corrosion of equipment, but also affect product quality and deteriorate technical and economic indicators. For this reason, wet process enterprises at home and abroad have strict requirements on the content of fluoride and chloride ions in the sulfate system. However, fluorine and chlorine are commonly found in raw materials, water and other raw and auxiliary materials, which makes it inevitable that fluorine and chlorine will enter the production system, especially the current development of circular economy, so that a large number of high-impurity secondary materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/06B01D53/68B01D53/80C01G3/10C01G9/06C01G45/10C01G49/14C01G51/10C01G53/10
CPCB01D3/06B01D3/009C01G3/10C01G9/06C01G53/10C01G51/10C01G45/10C01G49/14B01D53/80B01D53/68C01P2006/80B01D2251/404B01D2251/604Y02P10/20
Inventor 李玉虎马艳丽曹才放徐志峰李云贺欣豪陈金龙
Owner JIANGXI UNIV OF SCI & TECH
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