Recycling and purifying device of sulfuric acid waste liquid

Abstract

The invention belongs to the technical field of chemical engineering, and relates to a recycling and purifying device of sulfuric acid waste liquid. The device comprises a purifying tower, a degassingtower, an acid water storage tank, a filter press, a concentration tower, an acid mixing device and a tail suction tower; a discharging port of the purifying tower is connected with a feeding port ofthe degassing tower through a mud pump, a discharging port of the degassing tower is connected with a feeding port of the acid water storage tank, a discharging port of the acid water storage tank isconnected with a feeding port of the filter press through a pressing filtration pump, a discharging port of the filter press is connected with a feeding port of the concentration tower, and a discharging port of the concentration tower is connected with the acid mixing device; an exhaust port of the purifying tower and an exhaust port of the degassing tower are connected to a purifying negative-pressure flue, and an exhaust port of the concentration tower is connected with the tail suction tower. By means of the recycling and purifying device of the sulfuric acid waste liquid, the sulfuric acid waste liquid can be effectively purified, the sulfuric acid in the sulfuric acid waste liquid can be effectively recovered for adjusting the concentration of sulfuric acid in dry-suction finished products, the quantity of waste residues produced after purification is extremely low, and the valuable metal in the sulfuric acid waste liquid can be effectively recycled.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a recovery and purification device for sulfuric acid waste liquid. Background technique [0002] The sulfuric acid acid production system widely adopts wet purification, washing, dust removal and cooling technology to treat smelting flue gas. During the treatment process, the acidity, acid temperature, dust content, and harmful substances of the washing liquid are continuously enriched, and it is necessary to open the circuit, resulting in a large amount of acidic wastewater. At the same time, a large amount of new water needs to be added, and the discharge of acidic wastewater will cause environmental pollution, which needs to be treated; at present, the lime neutralization method is a relatively mature acidic wastewater treatment process, but the investment is high and the amount of waste residue is large; other treatment methods are also in operation. high cost issues. ...

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Problems solved by technology

[0002] The sulfuric acid acid production system widely adopts wet purification, washing, dust removal and cooling technology to treat smelting flue gas. During the treatment process, the acidity, acid temperature, dust content, and harmful substances of the washing liquid are continuously enriched, and it is necessary to open the circuit, resulting in a large amount of acidic wastewater. At th

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