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A method for efficiently removing heavy metals in polluted acid

A technology of heavy metals and heavy metal ions, which is applied in the field of comprehensive utilization of waste resources, can solve the problems of high cost and large amount of lye, and achieve the effects of low cost, easy acquisition and simple process

Active Publication Date: 2018-03-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent (CN102580484A) discloses a high-efficiency removal of sulfur dioxide and catalytic by-product sulfur, but this method uses lye as an absorbent, requires a large amount of lye, and is costly

Method used

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  • A method for efficiently removing heavy metals in polluted acid
  • A method for efficiently removing heavy metals in polluted acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Using Cu(NO 3 ) 2 、Na 2 SO 3 and H 2 SO 4 Formulated with Cu 2+ The concentration is 2.00g / L, containing SO 3 2- The concentration is 0.2g / L, containing SO 4 2- 100mL simulated dirty acid solution with a concentration of 75g / L. Bubble 3% simulated SO into the solution 2 Flue gas into the simulated sewage acid solution, the flow rate is 0.3L / min, the initial SO 2 The removal rate is 54%. After about 60 minutes of feeding, the sulfite and bisulfite ions contained in the dirty acid can meet the requirements for precipitation of heavy metals; Black precipitate. The precipitate was removed by filtration, and the XRD characterization result was figure 2 Shown; Get filtrate and carry out atomic absorption analysis, the content of copper ion is 0.63g / L, and copper ion removal rate is 68.50%.

Embodiment 2

[0039] This case simulates a high-concentration SO 3 2- of polluted acid, using Cu(NO 3 ) 2 、Na 2 SO 3 and H 2 SO4 Formulated with Cu 2+ The concentration is 2.00g / L, containing SO 3 2- The concentration is 74g / L, containing SO 4 2- 100mL simulated dirty acid solution with a concentration of 75g / L, and the sulfite and bisulfite ions contained in the dirty acid meet the requirements for precipitation of heavy metals; transfer the above solution to a reaction kettle, heat it to 160°C for 2 hours, and produce a large amount of Black precipitate. The precipitate was removed by filtration, and the result of XRD characterization was CuS; the filtrate was taken for atomic absorption analysis, the content of copper ions was 0.35g / L, and the removal rate of copper ions was 82.50%.

Embodiment 3

[0041] This case simulates a high-concentration SO 3 2- of polluted acid, using Cu(NO 3 ) 2 、Na 2 SO 3 and H 2 SO 4 Formulated with Cu 2+ The concentration is 2.00g / L, containing SO 3 2- The concentration is 74g / L, containing SO 4 2- 100mL simulated dirty acid solution with a concentration of 81g / L, and the sulfite and bisulfite ions contained in the dirty acid meet the requirements for precipitation of heavy metals; then add 0.20g sublimated sulfur to the solution, and stir to mix. The above solution was transferred to a reaction kettle, heated to 100° C. for 2 h, and a large amount of black precipitates were produced. The precipitate was removed by filtration, and the result of XRD characterization was CuS; the filtrate was taken for atomic absorption analysis, and the content of copper ions was 0.61×10 -3 g / L, the removal rate of copper ions is 99.99%.

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Abstract

The invention discloses a method for high efficiently removing heavy metals from polluted acid. According to the method, polluted acid is placed on an externally-applied energy field to carry out reactions, the heavy metal sulfides precipitate during the reaction process, finally the heavy metal sulfides are filtered and separated, and thus the heavy metals are removed from the polluted acid. The provided method fully utilizes the sulfite ions, bisulfite ions, and heavy metal ions in polluted acid to carry out self-cleaning, the heavy metals can be removed high efficiently, moreover, the operation is simple and efficient, the method is green and environment-friendly, the cost is low, and the comprehensive utilization of resources is achieved.

Description

technical field [0001] The invention relates to a method for purifying heavy metals in polluted acid through a low-temperature liquid phase, and belongs to the technical field of comprehensive utilization of waste resources. Background technique [0002] The non-ferrous metallurgical industry has played an important role in the development of the national economy, but it has also caused serious pollution to the environment. A large amount of heavy metal pollutants will be produced in the process of metallurgical industry. Due to the characteristics of heavy metal pollution that is harmful to human body, long-lasting and non-degradable, the Ministry of Environmental Protection of my country has compiled the "Twelfth Five-Year Plan for Comprehensive Prevention and Control of Heavy Metal Pollution", pointing out that from the source Prevent and control heavy metal pollution. [0003] In the production process of the smelting industry and the acid industry, a large amount of dir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/36C02F1/30C02F1/02C02F1/52
CPCC02F1/02C02F1/302C02F1/36C02F1/52C02F2101/20
Inventor 刘恢谢小峰柴立元张聪杨本涛向开松彭兵闵小波
Owner CENT SOUTH UNIV
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