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Method for reducing consumption of copper extractant in copper extraction process by nitric acid system

A copper extractant and a technology for extracting copper are applied in the field of reducing the consumption of copper extractant in the process of extracting copper by a nitric acid system, and can solve the problems of difficult phase separation, large consumption of extractant, easy oxidation and deterioration of extractant, etc., so as to reduce consumption The effect of high-volume, low-cost recycling

Active Publication Date: 2014-08-06
ZIJIN MINING GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is rarely used in the nitric acid system. The main reason is that the extractant is easy to oxidize and deteriorate, and the oxidative deterioration of the extractant will lead to difficulty in phase separation, low extraction efficiency, and large consumption of extractant.

Method used

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  • Method for reducing consumption of copper extractant in copper extraction process by nitric acid system

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Experimental program
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Effect test

Embodiment 1

[0020] Adopt the method disclosed in the present invention to first add lime to adjust the pH value of the purified waste water, so that the pH value is adjusted to 2.0, then add sodium dithionite according to the dosage of 50 mg / L, and use the method disclosed in the present invention to increase the pH value by 15% per liter Add 50mg2,6-di-tert-butyl p-cresol to the vol copper extractant. Through continuous extraction test, it is determined that the consumption of copper extractant is about 6.0 kg / ton of copper, the complete phase separation time of extraction is less than 60s, the recovery rate of copper in wastewater is greater than 96%, and the comprehensive treatment cost of wastewater is less than 15 yuan / ton of water.

Embodiment 2

[0022] Adopt the method disclosed in the present invention to first add lime to adjust the pH value of the purified waste water to adjust the pH value to 2.8, then add sodium dithionite according to the dosage of 150 mg / L, and use the method disclosed in the present invention to increase the pH value by 20% per liter Add 100mg2,6-di-tert-butyl p-cresol to the vol copper extractant. Through continuous extraction test, it is determined that the consumption of copper extractant is about 5.8 kg / ton of copper, the complete phase separation time of extraction is less than 60s, the recovery rate of copper in wastewater is greater than 96%, and the comprehensive treatment cost of wastewater is less than 15 yuan / ton of water.

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Abstract

The invention relates to a method for reducing the consumption of a copper extractant in a copper extraction process by a nitric acid system. By adopting the method, the problems of interphase substance increase, difficult phase splitting, low extraction efficiency, large extractant consumption and the like caused by the oxidative deterioration of the extractant are avoided to the greatest extend mainly by reducing the oxidability of an extraction solution and improving the oxidation resistance of the extractant, so as to reduce the consumption of the extractant in the nitric acid system and to realize the efficient and low-cost recycling treatment of the copper containing acidic wastewater.

Description

1. Technical field [0001] The invention belongs to the field of hydrometallurgy of non-ferrous metals, and in particular relates to a method for reducing the consumption of a copper extractant, in particular to a method for reducing the consumption of a copper extractant in the process of extracting copper with a nitric acid system. 2. Background technology [0002] In the gold purification process, nitric acid is often used to remove the impurity in the crude gold—copper. The copper content in the nitric acid solution after the impurity removal is relatively high, which has a very high recovery value. At present, the methods for recovering copper in the nitric acid system mainly include: precipitation method, replacement method, electrowinning method and extraction method. [0003] The copper in the recovery solution by the precipitation method is mainly by adding carbonate or alkali, and the copper is precipitated and recovered in the form of copper carbonate or copper hyd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/26C22B15/00
CPCY02P10/20
Inventor 廖斌彭钦华罗忠岩方荣茂廖小山衷水平刘亚建林烽先
Owner ZIJIN MINING GROUP
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