Method for treating copper-containing waste acid water

Abstract

The treatment method for copper-containing acid sewage comprises: treating the sewage with barium sulphide or sodium sulfide to prepare a plurality of chemical products, such as barium sulfate, and can recycle acid liquid with H+ content more than 16% as iron rust remover. This invention has no pollution and well social and economic benefits.

Description

technical field

[0001] The invention relates to a liquid waste treatment method, in particular to a treatment method for copper-containing waste acid water. It is suitable for the chemical industry that produces copper-containing waste acid water pollutants in the chemical production process. Background technique

[0002] Usually, during the production process of sodium saccharin, a large amount of copper-containing waste acid water pollutants will be produced when the diazo solution replacement reaction and chlorination reaction generate sulfuryl chloride. The waste acid water mainly contains: Cl - , SO 4 2- , Na + , H + Content > 16% and some organic matter. At present, for the treatment of this waste acid water, a method of iron replacement has been adopted, in which iron powder is placed in the waste acid water for a replacement reaction to generate sponge copper, thereby achieving the purpose of copper recovery. However, the acid waste water after the replaceme...

Examples

Embodiment 1

[0030] Add 3.5T of clear water into the leaching kettle, heat to 100°C, turn on the exhaust or vacuum, stir, and slowly add 1.2T of powdered barium sulfide with a content of 60%; continue to heat to 100°C, keep stirring for 30 minutes, and make the The concentration of the liquid taken is not lower than 15Be`; open the valve at the bottom of the kettle, pump it into the plate and frame filter press for filtration, remove the solid phase impurities and filter residue to the waste yard for centralized treatment; the treated filter residue can be used to produce cement or produce wall tiles Raw materials; the filtrate is introduced into the storage tank for standby. When filtering and leaching the barium sulfide solution, if barium sulfide is precipitated, the filter residue should be leached again with 100°C water.

[0031] Take the pretreated copper removal acid solution 5T and place it in an acid-resistant reaction kettle, turn on the induced wind or vacuum, stir, and slowly a...

Embodiment 2

[0035] Place 30% sulfuric acid solution in the acid-resistant reactor, then slowly add the barium sulfide leaching solution, and add lime water in the absorption liquid circulation tank to make the absorbent, and the others are the same as in Example 1 to obtain the calcium hydrosulfide finished product. The obtained finished product is analyzed and determined by the method specified in the relevant regulations, and meets the requirements of the method standards specified in the relevant regulations.

technical field

[0001] The invention relates to a liquid waste treatment method, in particular to a treatment method for copper-containing waste acid water. It is suitable for the chemical industry that produces copper-containing waste acid water pollutants in the chemical production process. Background technique

[0002] Usually, during the production process of sodium saccharin, a large amount of copper-containing waste acid water pollutants will be produced when the diazo solution replacement reaction and chlorination reaction generate sulfuryl chloride. The waste acid water mainly contains: Cl - , SO 4 2- , Na + , H + Content > 16% and some organic matter. At present, for the treatment of this waste acid water, a method of iron replacement has been adopted, in which iron powder is placed in the waste acid water for a replacement reaction to generate sponge copper, thereby achieving the purpose of copper recovery. However, the acid waste water after the replaceme...

Examples

Embodiment 1

[0030] Add 3.5T of clear water into the leaching kettle, heat to 100°C, turn on the exhaust or vacuum, stir, and slowly add 1.2T of powdered barium sulfide with a content of 60%; continue to heat to 100°C, keep stirring for 30 minutes, and make the The concentration of the liquid taken is not lower than 15Be`; open the valve at the bottom of the kettle, pump it into the plate and frame filter press for filtration, remove the solid phase impurities and filter residue to the waste yard for centralized treatment; the treated filter residue can be used to produce cement or produce wall tiles Raw materials; the filtrate is introduced into the storage tank for standby. When filtering and leaching the barium sulfide solution, if barium sulfide is precipitated, the filter residue should be leached again with 100°C water.

[0031] Take the pretreated copper removal acid solution 5T and place it in an acid-resistant reaction kettle, turn on the induced wind or vacuum, stir, and slowly a...

Embodiment 2

[0035] Place 30% sulfuric acid solution in the acid-resistant reactor, then slowly add the barium sulfide leaching solution, and add lime water in the absorption liquid circulation tank to make the absorbent, and the others are the same as in Example 1 to obtain the calcium hydrosulfide finished product. The obtained finished product is analyzed and determined by the method specified in the relevant regulations, and meets the requirements of the method standards specified in the relevant regulations.

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