Smelting gas acid-production wastewater treatment system

Abstract

The invention discloses a smelting gas acid-production wastewater treatment system which comprises a wastewater storage tank (1), a drug storage tank (2), a supergravity reactor (7) and a liquid storage tank (10), wherein the wastewater storage tank (1) is used for storing heavy metal wastewater; the drug storage tank (2) is used for storing a drug solution reacting with the heavy metal wastewater; the supergravity reactor (7) is communicated with the wastewater storage tank (1) and the drug storage tank (2); the heavy metal wastewater in the wastewater storage tank (1) reacts with the drug solution in the drug storage tank (2) in the supergravity reactor (7); the liquid storage tank (10) is connected with a liquid outlet (14) of the supergravity reactor (7); and the liquid after reaction in the supergravity reactor (7) is discharged into the liquid storage tank (10) through the liquid outlet (14). By adopting a novel mass transfer technology, the smelting gas acid-production wastewater treatment system disclosed by the invention can reduce a sodium sulfide reaction tank, enhance the mass transfer and improve the treatment efficiency of heavy metal and arsenic in the acid water, and is particularly suitable for a place with limited height and size.

Description

technical field [0001] The invention relates to a system for treating smelting flue gas acid-making wastewater, in particular to a system for treating smelting flue gas acid-making wastewater in copper, lead-zinc and other smelting industries. Background technique [0002] The waste acid discharged from the copper smelting acid system generally has an acidity of 5-10%, a copper content of 400-5000 mg / l, and an arsenic content of 600-5000 mg / l. After the solid particles are removed by a lead filter press, it enters the waste acid stock solution tank , and then into the vulcanization reaction tank to add sodium sulfide, so that the copper and arsenic ions in the acid water form sulfide precipitates, which are removed by thickening and pressure filtration. After sodium sulfide is added to the vulcanization reaction tank, it first reacts with hydrogen ions (more active than copper ions) in acid water to generate hydrogen sulfide gas. The main reaction mechanism is: part of the ...

AI Technical Summary

Problems solved by technology

The traditional acid water vulcanization reaction mechanism makes it difficult to form a unified acid water vulcanization process between ensuring safety and ensuring the efficiency of copper and arsenic removal

In order to obtain high copper and arsenic removal efficiency, it is necessary to retain excess hydrogen sulfide gas, which has safety risks such as poisoning and explosion.

[0006] 2. There is a risk of gypsum slag and neutralized slag being defined as hazardous waste

If the safety of the vulcanization reaction is guaranteed, it is necessary to reduce the dosage of sodium sulfide, which will reduce the efficiency of copper and arsenic removal, resulting in the gypsum slag produced in the neutralization process at the back end of the reaction, and the toxicity leaching index of neutralization slag will exceed the standard and will be defined as a dangerous solid Waste will be managed in accordance with the special regulations on hazardous waste management, which may cause enterprises to bear huge solid waste treatment costs

[0007] 3. The excess rate of sodium sulfide is relatively large, causing a large amount of unreacted sodium sulfide to enter the subsequent treatment process, which requires costly reprocessing of sulfide

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