A method for resourceful treatment of smelting sewage acid wastewater
A kind of waste acid waste water and recycling technology, which is applied in the direction of metallurgical waste water treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of restricting the sales scope of purified acid, low recovery rate, simultaneous recovery of acid, Water, valuable metals and other issues to achieve the effect of reducing the risk of pollution impact
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Embodiment 1
[0028] A method for resourceful treatment of smelting sewage acid wastewater, the process flow chart is as follows figure 1 shown, including the following steps:
[0029] S1. Pass hydrogen sulfide gas with a purity of 99.8% into the smelting sewage acid wastewater for sulfidation reaction. The sulfidation reaction time is controlled at 20 minutes, and the arsenic, copper, lead, cadmium, and bismuth in the smelting sewage acid wastewater are recovered to obtain sulfide purification. after liquid. Hydrogen sulfide gas is produced by hydrogen and sulfur in a synthesis reaction tower, the reaction temperature is 450-470°C, and the pressure is within 0.7Mpa; among them, the sulfur is the first-grade industrial sulfur on the market, with a purity of more than 99.5%, and hydrogen is recommended. Methanol or natural gas production, hydrogen production process belongs to modular equipment.
[0030] In this step, the smelting dirty acid wastewater is the dirty acid wastewater produced...
Embodiment 2
[0043] A method for the resourceful treatment of smelting dirty acid wastewater is basically the same as in Example 1, the only difference being that the smelting dirty acid wastewater is different, wherein the smelting dirty acid wastewater used in Example 2 is the drainage from the purification section of the sulfuric acid workshop of a certain zinc smelter , the amount of dirty acid wastewater is 260~330m 3 / d, water quality components are: As 200~1000mg / L, Cu 10~20mg / L, Pb 30~50mg / L, Cd50~150mg / L, Zn300~500mg / L, F 300~1500mg / L, Cl 300~ 1500mg / L, Ca 200~500mg / L, acidity 4%~5%.
[0044] In this example, the consumption of hydrogen sulfide is 0.3t / d, the output of sulfurized slag is 1.64t / d, and the output of sulfurized and purified liquid is 280m 3 / d.
[0045] In this example, after nanofiltration treatment, the output of deeply purified liquid is 168m 3 / d, the output of concentrated brine is 110m 3 / d. After the concentrated salt is processed by the metal recovery sy...
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