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Preparation of ionic liquid slow-release agent and method for purifying arsenic and heavy metal wastewater by using ionic liquid slow-release agent

A technology of ionic liquids and heavy metals, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of high cost, high harm, low efficiency, etc., achieve high utilization rate, reduce harm, and reduce use cost effect

Pending Publication Date: 2021-07-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The methods for recovering or removing heavy metals and arsenic components in the solution in the prior art have high cost, low efficiency, H 2 Defects such as great harm of S, the object of the present invention is to provide a slow-release donor that utilizes organic alcohol amines as adsorption storage and slow-release hydrogen sulfide to realize deep removal of heavy metals and arsenic-containing components in acidic wastewater containing arsenic and heavy metals And the method of recovery, this method can realize the H in the purification environment by using organic alcohol amine 2 S, and can slowly release H 2 S, so as to selectively recover valuable metals and deeply remove arsenic from industrial waste liquid with high efficiency and low cost, and release H slowly through ionic liquid slow-release agent 2 S is conducive to the selective separation of metal ions and arsenic, while avoiding the excessive crystallization of the product to form an amorphous product and enhancing its filtration performance

Method used

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  • Preparation of ionic liquid slow-release agent and method for purifying arsenic and heavy metal wastewater by using ionic liquid slow-release agent

Examples

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Effect test

Embodiment 1

[0028] Utilize this process method to process certain copper smelting dirty acid waste water, concrete steps are as follows: get a certain amount of dirty acid waste water (H 2 SO 4 content of 8%, copper content of 0.5g / L, arsenic content of 2g / L), the configuration concentration is 35% of dilute hydrochloric acid dripped into 1.2mol / L sodium sulfate solution at 10mL / min to produce hydrogen sulfide, and 35% The ionic liquid slow-release agent was synthesized from the N-methyldiethanolamine solution, and the synthesis conditions were as follows: synthesis pressure 4MPa, temperature 25°C, synthesis time 45min; desorption oil bath temperature was controlled at 110°C, desorption gas was slowly passed into dirty acid for vulcanization Reaction, the reaction temperature is 60°C, the stirring speed is 300r / min, and the oxidation-reduction potentiometer is used to monitor the potential of the reaction change. When the oxidation-reduction potential decreases from the initial 450mV to 2...

Embodiment 2

[0031] Utilize this technological method to process certain copper smelting soot leach liquor, concrete steps are as follows: get a certain amount of leach liquor (H 2 SO 4content of 7%, copper content of 20g / L, arsenic content of 8g / L), the configuration concentration is 40% dilute hydrochloric acid dripped into 1.2mol / L sodium sulfate solution at 10mL / min to produce hydrogen sulfide, and 40% of Synthesis of ionic liquid sustained-release agent with N-methyldiethanolamine solution, the synthesis conditions are: synthesis pressure 3MPa, temperature 25°C, synthesis time 60min; desorption oil bath temperature is controlled at 120°C, desorption gas is passed into dirty acid for vulcanization reaction, The reaction temperature is 40°C, the stirring speed is 300r / min, and the oxidation-reduction potentiometer is used to monitor the potential of the reaction change. When the oxidation-reduction potential decreases from the initial 447mV to 262mV, it means that the copper ions are ba...

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Abstract

The invention discloses a method for purifying arsenic and heavy metal wastewater by using an ionic liquid slow-release agent, which comprises the following steps: introducing hydrogen sulfide gas into an organic alcohol amine aqueous solution to carry out a hydrogen sulfide adsorption reaction to obtain an ionic liquid slow-release agent; and heating the ionic liquid slow-release agent to perform a hydrogen sulfide desorption reaction, introducing the desorbed hydrogen sulfide into acid wastewater containing arsenic and heavy metals, and performing a vulcanization reaction to obtain arsenic and heavy metal sulfide precipitates. According to the method, deep purification of the heavy metal acid wastewater and recovery of valuable metals can be achieved, pollution of H2S to the environment and danger and instability of hydrogen sulfide gas in the storage and transportation process are avoided, and the method is simple and convenient in operation process and beneficial to industrial application.

Description

technical field [0001] The invention relates to a treatment method for waste water containing arsenic and heavy metals, in particular to a method for deep removal and purification of heavy metals and arsenic in industrial acid waste liquid by using organic alcohol amines to absorb and slowly release hydrogen sulfide, and belongs to the technical field of heavy metal waste water treatment . Background technique [0002] In recent years, with the development of the economy and the further improvement of people's living standards, various industrial production activities are also accelerating. The common industrial production processes mainly include mineral smelting and processing, chemical industry, machinery manufacturing, pharmaceutical electronics, pigments, etc. During its industrial production, a large amount of wastewater containing heavy metal ions will be discharged, that is, heavy metal wastewater. Especially in the smelting of non-ferrous metals such as copper, lea...

Claims

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Application Information

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IPC IPC(8): C02F1/54C02F1/52C02F101/20C02F101/10
CPCC02F1/54C02F1/5236C02F2101/103C02F2101/20
Inventor 韩海生张荥斐孙伟袁佳田佳杨越岳彤
Owner CENT SOUTH UNIV
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