Method for separating halogen ions such as chlorine, fluorine and the like from sulfate

Abstract

The invention relates to a method for separating halogen ions such as chlorine, fluorine and the like from sulfate, which comprises the following steps: pretreating stock solution, namely performing pretreatment such as conditioning, removing oil, removing suspended matters and the like on the sulfate stock solution; separating by using a nanofiltration membrane, and separating halogen ions such as chlorine, fluorine and the like in sulfate by using the nanofiltration membrane; treating the nanofiltration retentate, wherein the nanofiltration retentate is sulfate solution separated from halogen ions such as chlorine, fluorine and the like, and the nanofiltration retentate returns to a sulfate circulating system or a production system of a main device; treating the nanofiltration permeate solution, wherein the nanofiltration permeate solution is a separated halide solution such as chlorine, fluorine and the like, and concentrating and crystallizing the permeate solution to prepare a halide product such as chlorine, fluorine and the like. The method comprises the following steps: separating halogen ions such as chlorine, fluorine and the like in sulfate by using a nanofiltration membrane, and selecting the nanofiltration membrane with the aperture of 0.1nm-8.5nm and high separation efficiency of monovalent ions and multivalent ions, thereby reducing the halogen ions such as chlorine, fluorine and the like in the sulfate.

Description

technical field [0001] The invention belongs to the technical fields of chemical industry, environmental protection and the like, and relates to a method and a device for separating halogen ions such as chlorine and fluorine from ammonium sulfate salts. Background technique [0002] In the chemical and environmental protection process of using and producing sulfates such as ammonium sulfate, there are often problems of enrichment of chlorine and fluorine halogen ions, which have the following adverse effects on the system: 1. Serious corrosion of the device leads to poor reliability of the device and high operating costs. 2. It affects the crystallization of sulfate, making it difficult to maintain normal production. 3. Cause the chlorine and fluorine in the product sulfate to exceed the standard, affecting the quality of the sulfate. 4. The existence of halogen ions such as chlorine and fluorine reduces the efficiency and effect of the use and production of sulfate, which ...

AI Technical Summary

Problems solved by technology

[0002] In the chemical and environmental protection process of using and producing ammonium sulfate and other sulfates, there are often problems with the enrichment of chlorine and fluorine halogen ions, which have the following adverse effects on the system: 1. Serious corrosion of the device leads to poor reliability of the device and high operating costs

2. It affects the crystallization of sulfate, making it difficult to maintain normal production

3. Cause the chlorine and fluorine in the product sulfate to exceed the standard, affecting the quality of the sulfate

4. The existence of halogen ions such as chlorine and fluorine reduces the efficiency and effect of the use and production of sulfate, which affects the operating efficiency of the main device

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