Method for separation and enrichment of copper and arsenic in copper smelting acidic wastewater

A technology for copper smelting and arsenic separation, which is applied in the intersecting fields of metallurgical engineering and environmental engineering, can solve problems such as waste of resources, and achieve the effects of improving copper grade, economic efficiency, and activation energy

Active Publication Date: 2016-05-04
CENT SOUTH UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at providing an environmentally friendly and efficient method for the separation and enrichment of copper and arsenic in view of the defect that copper and arsenic are difficult to separate and enrich in the current copper smelting sewage acid treatment method, resulting in waste of resources

Method used

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  • Method for separation and enrichment of copper and arsenic in copper smelting acidic wastewater
  • Method for separation and enrichment of copper and arsenic in copper smelting acidic wastewater

Examples

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Effect test

Embodiment 1

[0022] Take 500ml of polluted acid from a copper smelting enterprise, the main components are copper 2.6g / L, arsenic 7.8g / L, and sulfuric acid mass concentration 230g / L. Sodium sulfide was first added at a ratio of S / As molar ratio of 1.2, reacted at 30° C. for 1 hour, and then filtered to obtain sulfide slag. The obtained vulcanized slag is ball milled for 1 hour under the conditions of using water as the ball milling medium, the ball-to-material ratio is 1:5, and the ball milling speed is 500r / min, and the activated vulcanized slag is added into the Into 500ml of polluted acid wastewater, ultrasonic dispersion for 0.5h, ultrasonic frequency of 20kHz, reaction at 50°C for 2h, after filtration, copper-rich slag and arsenic-rich solution were obtained, the copper concentration in the solution was reduced to 9.7mg / L, and the copper recovery rate was 99.6 %. The main elements and content of copper-rich slag are shown in Table 1:

[0023] The main element and content (%) of tabl...

Embodiment 2

[0030] Take 500ml of polluted acid from a copper smelting enterprise, the main components are copper 3.6g / L, arsenic 8.9g / L, sulfuric acid mass concentration 180g / L. According to the ratio of S / As molar ratio of 1.1, hydrogen sulfide gas is first introduced, reacted at 40° C. for 1 hour, and then filtered to obtain sulfide slag. The obtained vulcanized slag is ball milled for 1 hour under the conditions of using water as the ball milling medium, the ball-to-material ratio is 1:8, and the ball milling speed is 600r / min. Into 500ml of polluted acid wastewater, ultrasonic dispersion for 1h, ultrasonic frequency is 40kHz, reaction at 40°C for 1.5h, after filtration, copper-rich slag and arsenic-rich solution are obtained, the copper content in the solution is 5.3mg / L, and the copper recovery rate is 99.7% . The copper grade in the copper-rich slag reaches 42.1%, and the arsenic content is 0.89%, while the arsenic sulfide slag is directly added to the polluted acid without mechani...

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Abstract

The invention relates to a method for separation and enrichment of copper and arsenic in copper smelting acidic wastewater. The method includes the following steps that (1) the acidic wastewater is subjected to sulfide precipitation to generate sulfide slag containing the copper and the arsenic; (2) the sulfide slag is activated through mechanical ball milling; (3) the activated sulfide slag is added into the acidic wastewater according to a certain As / Cu mole ratio, and a reaction is conducted after ultrasonic dispersion; (4) solid-liquid separation is carried out after the reaction, so that copper-rich slag is obtained; and (5) liquid obtained after separation is subjected to deep sulfuration, so that arsenic-rich slag is obtained. According to the method, the sulfide slag is activated, is added into the acidic wastewater and then reacts after ultrasonic dispersion, so that not only are separation and enrichment of the copper and the arsenic in the acidic wastewater achieved, but also reaction time is greatly shortened, the reaction temperature is lowered, and reaction efficiency is improved; the method has good use value.

Description

technical field [0001] The invention belongs to the cross field of metallurgical engineering and environmental engineering, and in particular relates to a method for separating and enriching copper and arsenic in copper smelting sewage acid. Background technique [0002] Most of the raw materials in copper smelting are sulfide concentrates, accompanied by a certain amount of arsenic. In the process of high-temperature desulfurization by pyrolysis, a large amount of smelting flue gas is produced. The flue gas contains relatively high concentrations of sulfur and arsenic and a certain amount of Copper, which is dirty acid after washing with water. The sewage acid in the copper smelting industry has complex components, all of which are strongly acidic, and contain high concentrations of copper and arsenic. It is currently the main source of acidic arsenic-containing heavy metal wastewater in smelters. Due to its high concentration of copper and arsenic and acidity, it must be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B30/04
CPCC22B7/006C22B15/0063C22B30/04Y02P10/20
Inventor 柴立元蒋国民胡明王庆伟杨志辉李青竹高伟荣
Owner CENT SOUTH UNIV
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