Method for treating vanadium extracting industrial acid wastewater and comprehensively recycling valuable metal

Abstract

The invention discloses a method for treating vanadium extracting industrial acid wastewater and comprehensively recycling valuable metal. The method comprises the following steps that aeration and oxidation are carried out on the acid wastewater, and then a purifying agent A is added and is at least one of limestone, unslaked lime, slaked lime and lime milk; stirring is carried out for reacting, and the pH of the reaction endpoint is controlled to be equal to 4.5 to 5.0; filtering and washing are carried out, and primary purifying liquid and primary purifying residues are obtained; a purifying agent B is added to the primary purifying liquid, and is at least one of unslaked lime, slaked lime and lime milk; stirring is carried out for reacting, and the pH of the reaction endpoint is controlled to be equal to 6.5 to 7.5; filtering and washing are carried out, and secondary purifying liquid and secondary purifying residues are obtained; and a purifying agent C is added to the secondary purifying liquid and is at least one of sodium dimethyldithiocarbamate (SDD), sodium sulfide and barium sulfide, stirring is carried out for reacting, filtering is carried out, and third purifying liquid and third purifying residues are obtained. The method has the beneficial effects of being simple in process step, low in treatment cost, good in valuable metal comprehensive recovery effect and the like.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and relates to a method for the treatment of vanadium-extracting industrial acidic wastewater and comprehensive recovery of valuable metals, in particular to a method for step-by-step and comprehensive recovery of valuable metals from the vanadium-extracting industrial acidic wastewater. Background technique [0002] The sodium chlorination roasting process of vanadium ore has the advantages of simple operation, less impurity content, and easy handling, but it has a great impact on the environment and is not supported by national policies. In contrast, acid leaching processes such as blank roasting or calcified roasting of vanadium ore, full wet leaching and other acid leaching processes will become the future development direction of the vanadium industry. [0003] However, during the acid leaching process of vanadium ore, impurities such as iron, aluminum, zinc, copper, ...

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Problems solved by technology

[0003] However, during the acid leaching process of vanadium ore, impurities such as iron, aluminum, zinc, copper, nickel, cobalt and other heavy metals will enter the acid leaching solution in large quantities, and after the vanadium is enriched by ion resin exchange, extraction or chemical precipitation , various impurity elements remain in the waste water after enrichment of vanadium. If the waste water is not treated, various impurities will gradually circulate and accumulate in the water system, which will affect the operation of the process, cause environmental pollution problems, and seriously affect the vanadium. enrichment and product quality

[0004] The conventional technology for the treatment of acid wastewater in the vanadium extraction industry is neutralization and precipitation, but this method has disadvantages such as high cost of alkali consumption, large consumption of reagents, large amount of generated slag, and mixed slag that is difficult to comprehensively recover valuable metals.

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