Waste acid resource recycling method

Abstract

The invention discloses a waste acid resource recycling and treatment method, which comprises the following steps: 1) adding a vulcanizing agent into waste acid, firstly recovering valuable metals inthe waste acid, and then removing arsenic; 2) carrying out electrodialysis separation on fluorine ions, chloride ions and sulfate ions by adopting a selective separation ionic membrane under the action of an electric field, and recycling dilute sulfuric acid obtained after the fluorine ions and the chloride ions are removed for production; and (3) neutralizing and adsorbing the high-fluorine wastewater containing fluorine ions and chloride ions obtained in the step (2), and then recycling or discharging. According to the method, the valuable metal recovery rate reaches 90% or above, the treated waste acid reaches the recycling standard, and the hazardous waste generation amount is reduced by 90% or above.

Description

technical field [0001] The invention belongs to the field of environmental protection hazardous waste treatment methods. Specifically, the invention relates to a resource recovery and treatment method of polluted acid, which is used for resource recovery and treatment of polluted acid produced in nonferrous metal smelting, especially for copper, lead, zinc, Treatment of dirty acid in nickel and other smelting industries. Background technique [0002] Flue gas from non-ferrous metal smelting must be washed and purified before acid production. During this process, heavy metals such as arsenic, lead, and cadmium, fluoride, and chloride are particularly easily absorbed by water and dilute acid. Dirty acid with chlorine. Because the polluted acid contains heavy metals, especially fluorine and chloride ions, it cannot be reused. At present, the methods of lime neutralization, HDS neutralization, and sulfide-lime neutralization are mainly used for the treatment of polluted acid wa...

AI Technical Summary

Problems solved by technology

Because the polluted acid contains heavy metals, especially fluorine and chloride ions, it cannot be reused. At present, the methods of lime neutralization, HDS neutralization, and sulfide-lime neutralization are mainly used for the treatment of polluted acid wastewater, and the following problems exist: ① Pollution Valuable metals are transferred to the waste residue during the acid treatment process, which is difficult to recycle. At the same time, a large amount of hazardous waste is generated, the disposal cost is high, and it is easy to cause serious secondary pollution; ② The loss and waste of acid resources; ③ Due to the large amount of lime milk , which not only results in high cost of sewage treatment, but also makes the hardness of the effluent too high, which seriously affects the reuse of wastewater

In this patent application, 1) there are many pretreatment steps for the removal of arsenic and heavy metals by polluted acid, and valuable metals cannot be recovered; 2) the ion exchange method is usually used in occasions with relatively good water quality, and ion exchange is used to remove pollutants under strong acid conditions. It is very difficult to realize the technology of fluorine and chlorine in acid

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