Process for preparing strong acid and strong alkali by separating cobalt smelting wastewater

Abstract

The invention discloses a process for preparing strong acid and strong alkali by separating cobalt smelting wastewater. The process is characterized by comprising the following steps: S1, filtration by microfiltration: using a microfiltration system to treat cobalt smelting wastewater to remove a lot of suspended soils and particles and controlling the SS value being less than 1 to obtain microfiltration contributing water; S2, nanofiltration separation: feeding the treated microfiltration contributing water to a nanofiltration system to separate two types of salt to obtain nanofiltration concentrated water and nanofiltration contributing water, wherein the nanofiltration concentrated water is sodium sulfate and the nanofiltration contributing water is sodium chloride; S3, nanofiltration concentrated water treatment: feeding the nanofiltration concentrated water into a bipolar membrane system to be treated to prepare sodium hydroxide and sulfur acid; and S4, nanofiltration contributing water treatment: feeding the nanofiltration contributing water into the bipolar membrane system to be treated to obtain sodium hydroxide and hydrochloric acid. The process for preparing strong acid and strong alkali by separating cobalt smelting wastewater disclosed by the invention abandons high cost caused by evaporation, so that salt in the wastewater can be recycled in the process, and zero discharge of wastewater is achieved.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a process for producing strong acid and strong alkali by separating cobalt smelting wastewater. Background technique [0002] Cobalt is one of the important strategic minerals in the world. It has the characteristics of high temperature resistance, corrosion resistance, high strength and strong magnetism. It is widely used in industries such as aviation, aerospace, electrical appliances, machinery manufacturing, hard alloys, magnetic materials, chemicals and ceramics. , has special significance in national economic and social development. At present, the synthesis of cobalt chloride is mostly synthesized by cobalt ore and hydrochloric acid under the catalysis of nitric acid and other catalysts after pretreatment. Since cobalt ore contains impurities such as nickel, iron, zinc, lead, etc., sulfuric acid and hydrochloric acid are often added during smelting for extraction. Metal ion...

AI Technical Summary

Problems solved by technology

In the traditional treatment process, the wastewater is directly concentrated by evaporation, resulting in a large amount of evaporation and concentration and high concentration costs.

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