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Multi-path recycling method for wastewater produced in acid-making with smelting gas

A smelting flue gas, multi-channel technology, applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of long process, large investment, high operating cost of acid water treatment, and achieve reliable operation. , the effect of low operating cost and small amount of waste

Active Publication Date: 2017-12-26
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] A large amount of acidic wastewater will be produced during the wet purification and washing process of acid production from non-ferrous metal smelting flue gas. The conventional acidic water treatment process is long, requires a large investment, and will continue to generate a large amount of waste. The operating cost of acidic water treatment is too high. Seriously affect the cost of acid production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Apply the multi-channel recycling method of the present invention to a low-concentration acid-making wastewater (copper content: 106mg / L, lead content: 11.8mg / L, arsenic content: 486mg / L, acidity: 43.71g / L) L, cadmium content: 36mg / L, iron content: 174mg / L, zinc content: 508mg / L, fluorine content: 948.65 mg / L, chlorine content: 2.06 g / L, flow rate: 15m 3 / h) recovery, since the acidity of the acidic wastewater is low, the method of evaporation concentration and acid mixing can be used for recycling, which specifically includes the following steps: the acidic wastewater generated by purification and washing is recycled and concentrated in the purification system, and press-filtered once , the discharge of the primary clear liquid is reduced by 85%, and the lead slag produced by the primary filter press is recovered to extract lead; the primary clear liquid is transported to the tubular reactor and reacted with a sodium sulfide solution with a mass volume concentration of ...

Embodiment 2

[0018] Apply the multi-channel recycling method of the present invention to a low-concentration acid-making wastewater (copper content: 146.9mg / L, lead content: 9.62mg / L, arsenic content: 894mg / L, acidity: 104g / L L, cadmium content: 55.8mg / L, iron content: 184.6mg / L, zinc content: 602mg / L, fluorine content: 1346.69 mg / L, chlorine content: 2.96 g / L, flow rate: 18m 3 / h) recovery, since the acidity of the acidic wastewater is low, the method of evaporation concentration and acid mixing can be used for recycling, which specifically includes the following steps: the acidic wastewater generated by purification and washing is recycled and concentrated in the purification system, and press-filtered once , the discharge of the first-time clear liquid is reduced by 83%, and the lead slag produced by the first-time filter press is recovered to extract lead; the first-time clear liquid is transported to the tubular reactor and reacted with a sodium sulfide solution with a mass volume conc...

Embodiment 3

[0020] The multi-channel recycling method of smelting flue gas acid production wastewater of the present invention is also applied to a high concentration acid production wastewater (copper content: 496mg / L, lead content: 11.3mg / L, arsenic content: 1604mg / L, acidity: 165.6 g / L, cadmium content: 61.8mg / L, iron content: 258mg / L, zinc content: 502mg / L, fluorine content: 3144.93 mg / L, chlorine content: 5.4 g / L, flow rate: 15m 3 / h) recovery, due to the high acidity of the acid water, and the high content of fluorine and chlorine, the method of evaporative cooling and crystallization is used for recovery, which specifically includes the following steps: the acid wastewater produced by acid purification is passed through the purification process After circulating and concentrating in the body, the acidic wastewater produced by purification and washing is circulated and concentrated in the purification system, and the primary clear liquid is reduced by 80%, and the lead residue produc...

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Abstract

The invention discloses a multi-path recycling method for wastewater produced in acid-making with smelting gas, which belongs to the technical field of chemical engineering. The method comprises the steps of firstly performing discharging reduction on the acid wastewater by an internal circulation concentration method of a purification system, treating the acid wastewater by a process of primary vulcanization, neutralization and secondary vulcanization to remove heavy metals, arsenic, sulfuric acid, iron and zinc in the acid water in sequence, according to market demand, producing magnesium sulfate heptahydrate by cooling crystallization, and preparing sulfuric acid solution by evaporation concentration, thus realizing the ultimate goal of zero acid wastewater discharging. The process flow is reliable and can be used for recycling the acid water in two different ways; operating cost is low, new produced waste quantity is small, multiple products can be produced for generating profit, slag generated in different stages has different utilization values, and the aim of multi-path recycling of the acid wastewater is truly realized.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to wastewater treatment in nonferrous metal smelting, in particular to a multi-channel recovery and utilization method for wastewater from smelting flue gas acid production. Background technique [0002] A large amount of acidic wastewater will be produced during the wet purification and washing process of acid production from non-ferrous metal smelting flue gas. The conventional acidic water treatment process is long and requires a large investment, and will continue to generate a large amount of waste. The operating cost of acidic water treatment is too high. Seriously affect the cost of acid production. Therefore, there is an urgent need for a method that can reduce the discharge of purified acid water and reduce the investment and operating costs of acid water treatment. Contents of the invention [0003] The purpose of the present invention is to solve the above techn...

Claims

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Application Information

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IPC IPC(8): C02F9/10C22B7/02C22B13/00C22B15/00C22B30/04C22B19/20C22B17/00C01F5/40C01B17/74C02F103/16
CPCC01B17/74C01F5/40C02F1/001C02F1/04C02F1/66C02F9/00C02F2103/16C02F2301/08C22B7/006C22B7/02C22B13/045C22B15/0086C22B17/04C22B19/20C22B30/04Y02P10/20
Inventor 方永水史万敬魏占鸿马俊李山东王辉何春文张宏昌王金峰王程飞刘世和
Owner JINCHUAN GROUP LIMITED
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