A method for comprehensive treatment of lead-zinc steel wire rope sludge and lead-containing waste hydrochloric acid

Abstract

The invention discloses a comprehensive treatment method of lead-zinc-containing wire rope sludge and lead-containing waste hydrochloric acid and belongs to the field of chemical waste treatment. The method of the invention comprises the following steps: mixing lead-zinc-containing wire rope sludge and lead-containing waste hydrochloric acid, regulating pH value to 0-0.5, extracting, transferring metal ions in lead-zinc-containing wire rope sludge into a liquid, filter-pressing, successively adding impurity removal agents into the liquid containing metal ions according to content of metal ions, and respectively carrying out fine separation on metal ions to obtain crude products containing metal ions and a purified ferrous chloride solution. Innocent treatment of lead-zinc-containing wire rope sludge and lead-containing waste hydrochloric acid is realized; and through further elaborate processing of a lead phosphate crude product, a zinc phosphate crude product and the purified ferrous chloride solution, resource utilization of lead-zinc is realized, and lead content of all non-lead products is below 20 ppm.

Description

technical field [0001] The invention relates to the field of chemical waste treatment, in particular to a method for comprehensively treating lead-zinc steel wire rope sludge and lead-containing waste hydrochloric acid and finally realizing resource utilization. Background technique [0002] A large amount of acidic wastewater will be produced during the production of steel wire rope. Usually, in order not to pollute the environment, these acidic wastewater will be discharged or recycled after being neutralized. Regardless of whether it is neutralized with lime or caustic soda, the iron, lead, and Impurities such as zinc form sludge in the form of hydroxide precipitation and saturated salt precipitation. This kind of sludge belongs to hazardous waste due to the serious excess of heavy metals. Generally, one ton of wastewater will produce about 20 kilograms of sludge with a water content of 70%. Only the steel wire rope enterprises in Nantong area produce about 20,000 tons o...

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Problems solved by technology

[0014] In view of the above problems, the purpose of this invention is to provide a method for the comprehensive treatment of lead-zinc steel wire rope sludge and lead-containing waste hydrochloric acid, to solve the problem that the existing treatment technology cannot effectively separate lead and zinc, and to realize lead-zinc steel wire rope sludge and Harmless treatment of lead-containing waste hydrochloric acid and resource utilization of lead and zinc

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