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Treatment method of lead-zinc smelting waste acid

A treatment method and technology for polluted acid, applied in non-polluting water treatment, metallurgical wastewater treatment, water/sewage treatment, etc., can solve the problems of high treatment cost, high energy recovery cost, complicated equipment composition, etc., and achieve high-efficiency separation, The effect of easy access and improved separation efficiency

Active Publication Date: 2020-09-15
湖南中金岭南康盟环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of technological process and equipment composition is relatively complex, the processing cost is high, the safety hazard of hydrogen sulfide use is great, the evaporation operation cost is high, and the equipment maintenance is difficult
[0005] Therefore, the existing technology to deal with lead-zinc smelting sewage acid still has H 2 SO 4 Problems such as high cost of recycling energy consumption and difficult operation and management

Method used

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  • Treatment method of lead-zinc smelting waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The components of dirty acid are as follows:

[0071] The zinc concentration is 100mg / L, the lead concentration is 10mg / L, the arsenic concentration is 40mg / L, the cadmium concentration is 100mg / L, the sulfuric acid concentration is 30g / L, the chlorine concentration is 1g / L, and the fluorine concentration is 2g / L.

[0072] For processing see figure 1 , figure 1 It is a schematic flow diagram of processing smelting sewage acid according to the embodiment of the present invention, specifically including:

[0073] S1. Add 1.25 kg of ZnO to 50 L of polluted acid, control the reaction pH to 5.0, and stir for 1 hour to obtain a neutralizing solution of polluted acid.

[0074] S2, add 10g Fe to 50L dirty acid neutralizing solution 2 (SO 4 ) 3 , control the reaction pH to 4.0, stir the reaction for 1 hour, and obtain the arsenic slag and arsenic removal mother liquor after filtration.

[0075] S3. Add 50L of arsenic-removing mother liquor, 100L of pure water, and 0.95kg o...

Embodiment 2

[0089] The components of dirty acid are as follows:

[0090] The zinc concentration is 300mg / L, the lead concentration is 13mg / L, the arsenic concentration is 80mg / L, the cadmium concentration is 50mg / L, the sulfuric acid concentration is 200g / L, the chlorine concentration is 3g / L, and the fluorine concentration is 0.5g / L.

[0091] For processing see figure 1 , figure 1 It is a schematic flow diagram of processing smelting sewage acid according to the embodiment of the present invention, specifically including:

[0092] S1. Add 8.30 kg of ZnO to 50 L of polluted acid, control the reaction pH to 6.5, and stir for 1 hour to obtain a neutralizing solution of polluted acid.

[0093] S2, add 18g Fe in 50L polluted acid neutralization liquid 2 (SO 4 ) 3 , control the reaction pH to 6.0, stir the reaction for 1 hour, and obtain the arsenic slag and arsenic removal mother liquor after filtration.

[0094] S3. Add 50L of arsenic-removing mother liquor, 250L of pure water, and 1.1...

Embodiment 3

[0108] The components of dirty acid are as follows:

[0109] The zinc concentration is 150mg / L, the lead concentration is 18mg / L, the arsenic concentration is 100mg / L, the cadmium concentration is 80mg / L, the sulfuric acid concentration is 90g / L, the chlorine concentration is 0.5g / L, and the fluorine concentration is 3g / L.

[0110] S1. Add 3.72 kg of ZnO to 50 L of polluted acid, control the reaction pH to 7.0, and stir for 1 hour to obtain a neutralizing solution of polluted acid.

[0111] S2, add 20g Fe to 50L dirty acid neutralizing solution 2 (SO 4 ) 3 , control the reaction pH to 5.0, stir the reaction for 1 hour, and obtain the arsenic slag and arsenic removal mother liquor after filtration.

[0112] S3. Add 50L of arsenic-removing mother liquor, 100L of pure water, and 1.47kg of sodium sulfate into the regulating water tank, and control the ratio of the moles of sodium ions in the regulating water tank to the total moles of fluorine and chloride ions to be 1.2:1. Th...

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Abstract

The invention provides a treatment method of lead-zinc smelting waste acid. The method comprises the following steps: (1) adding ZnO into the smelting waste acid, and carrying out a neutralization reaction to obtain a neutralized waste acid solution; (2) adding an arsenic removal agent into the neutralized waste acid solution, carrying out an arsenic removal reaction, and filtering after the reaction is completed to obtain arsenic slag and an arsenic-removed mother liquor; (3) mixing the arsenic-removed mother liquor with sodium sulfate and pure water, and carrying out nanofiltration to obtainnanofiltered concentrated water and a fluorine-containing chlorine solution; (4) carrying out RO concentration on the fluorine-containing chlorine solution to obtain RO pure water and RO concentratedwater; and (5) adding a precipitant into the RO concentrated water, and carrying out a defluorination precipitation reaction and solid-liquid separation to obtain a sodium chloride-containing solution and calcium fluoride slag. The treatment method provided by the invention is simple and safe in operation management, can effectively reduce the operation energy consumption and the treatment cost,can recover sulfuric acid in the waste acid at the same time, and ensures that the water quality index of the waste acid reaches the standard and is discharged.

Description

technical field [0001] The invention belongs to the technical field of heavy metal smelting wastewater treatment, and in particular relates to a treatment method for lead-zinc smelting sewage acid. Background technique [0002] During the roasting process of lead-zinc hydrometallurgy, a large amount of SO 2 The concentrated ore roasting flue gas enters the sulfuric acid workshop for purification treatment. After the flue gas is washed, it produces a high concentration of H 2 SO 4 , Hg, As, Pb, Zn, Cd and other heavy metal ions, and F, Cl and other non-metallic ions of polluted acid. [0003] Sewage acid is the main source of wastewater in the lead-zinc smelting industry, and it is also an important problem in the wastewater treatment of the lead-zinc smelting industry. At present, the lead-zinc smelting sewage acid treatment processes mainly include lime + iron salt precipitation method, electrochemical method, sulfide precipitation method, biological preparation method, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/10C01D3/04C01D3/14C01G9/06C02F103/04C02F103/16
CPCC02F9/00C01D3/04C01D3/14C01G9/06C02F2103/16C02F1/66C02F1/58C02F1/442C02F1/441C02F1/583C02F1/048
Inventor 邓盼周康根李许枝余承红吴班姜科胡舜聪潘希贤周惠
Owner 湖南中金岭南康盟环保科技有限公司
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