Treatment method of waste acid solution containing heavy metals

Abstract

The invention provides a treatment method of a waste acid solution containing heavy metals, which comprises the following steps: carrying out iron-carbon reduction treatment on the waste acid solutionto reduce Fe< 3 + > in the solution into Fe < 2 + >; under the condition of high-concentration acid, adopting an ammonia extraction agent toextracta waste zinc solution and a waste acid solution, wherein the waste zinc solution contains Zn < 2 + >, and the waste acid solution contains at least one of iron ions, nickel ions, chromium ions and lead ions; adding an alkaline substance into the wastezinc solution to obtain zinc hydroxide and an organic solvent can be used as theammonia extraction agent; and precipitating heavy metals in the waste acid solutionby a synthestic sulfur precipitant. Compared with the prior art, the method has the following advantages that ferric ions are reduced, free acid is reduced and a small amount of heavy metalsarereplaced by utilizing an iron elementary substance while iron-carbon pretreatment is carried out; the zinc separation rate can reach 99.8% or above; the obtained zinc oxide product with the content of 98% or above can be used for selling; one part of an obtained supernatant can be used for circulating water, and the other part can be used for industrial water.

Description

technical field [0001] The invention relates to a treatment method for waste acid solution containing heavy metals. Background technique [0002] In order to treat waste acid solutions containing heavy metals such as zinc-containing and iron-containing waste hydrochloric acid, the treatment methods mainly include: neutralization precipitation method, roasting method, membrane technology, distillation method, etc. [0003] However, based on the current treatment method, the filtration efficiency is low, and the precision of the by-products obtained from the treatment or the added value of the products are not good. [0004] Therefore, there is an urgent need for a better treatment method for waste acid solution containing heavy metals. Contents of the invention [0005] The present invention provides a treatment method for waste acid solution containing heavy metals to solve the above problems. [0006] The application provides a treatment method for waste acid solution c...

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Problems solved by technology

[0003] However, based on the current processing method, its filtration efficiency is low, and the precision of by-products obtained from processing or the added value of products are not good.

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