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Extraction agent for precious metal separation and method for extracting and separating precious metals by using extraction agent

A separation method and precious metal technology, applied in the field of extraction, can solve the problems of limited selection of extraction agents, low extraction and separation efficiency, etc.

Active Publication Date: 2018-09-14
中科新镧系(厦门)科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, in view of the limited selection of extractants in the traditional hydrometallurgy process, the extraction and separation efficiency of gold in the solution is not high; it is of great research significance to improve the extraction and separation efficiency of gold in the solution extraction method by improving the extractant

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  • Extraction agent for precious metal separation and method for extracting and separating precious metals by using extraction agent
  • Extraction agent for precious metal separation and method for extracting and separating precious metals by using extraction agent
  • Extraction agent for precious metal separation and method for extracting and separating precious metals by using extraction agent

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preparation example Construction

[0049] Among the present invention, the preparation method of described extraction agent, comprises the steps:

[0050] Compound shown in formula (II) and R 1 R 2 NH is a raw material, and at a certain temperature, reacts to obtain the extraction agent for noble metal separation shown in formula (I);

[0051]

[0052] Among them, X 1 、X 2 , R 1 , R 2 is defined as above.

[0053] In a preferred embodiment of the present invention, the preparation method specifically includes the following steps:

[0054] 1) compound shown in formula (II) and R respectively 1 R 2 NH is dissolved in an organic solvent, where, X 1 、X 2 , R 1 , R 2 as defined above;

[0055] 2) The above two solutions are mixed and reacted to prepare the extractant for separating precious metals represented by formula (I).

[0056] Wherein, the compound represented by formula (II) is diglycolic anhydride.

[0057] Wherein, in step 1), the organic solvent is selected from one or both of dichlorome...

Embodiment 1

[0079] Weigh 1.52g (13.1mmol) diglycolic anhydride and 2.87g (11.9mmol) R 1 R 2 NH(R 1 selected from isooctyl, R 2 selected from isooctyl), which were dissolved in 20mL of dichloromethane organic solvent respectively; the two solutions were mixed and reacted at 25°C; during the reaction, the mixed solution gradually became clear, and when it was completely clear, the reaction Complete (about reaction 12h), make extraction agent shown in formula (I) (wherein, X 1 and x 2 Same as -O-, R 1 and R 2 The same is isooctyl); the prepared extractant is washed with high-purity deionized water to remove impurities, and then magnesium sulfate is added to the washed product to filter to obtain a water-free product, and the processed product is rotated The organic solvent was removed by evaporating and condensing apparatus, and then dried in a vacuum oven at 75°C for 12 hours, so as to obtain a high-purity extractant. Wash the prepared extractant several times with 0.1M hydrochloric ...

Embodiment 2

[0088] Weigh 1.52g (13.1mmol) diglycolic anhydride and 2.87 (11.9mmol) R 1 R 2 NH(R 1 selected from 2-ethylhexyl, R 2 Selected from 2-ethylhexyl), it is dissolved in 20mL dichloromethane organic solvent respectively; Under 25 ℃, react; Reaction 12h), the extraction agent (wherein, X) shown in formula (I) is obtained 1 and x 2 Same as -O-, R 1 and R 2 The same is 2-ethylhexyl); the prepared extractant is washed with high-purity deionized water to remove impurities, and then magnesium sulfate is added to the washed product to filter to obtain a water-free product, and the processed product The organic solvent was removed by a rotary evaporator condenser, and then dried in a vacuum oven at 75° C. for 12 hours to obtain an extractant with higher purity. Wash the prepared extractant several times with 0.1M hydrochloric acid or crystallize with n-hexane to obtain a more pure extractant.

[0089] The purity of the extractant (referred to as extractant E2) prepared by the abov...

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Abstract

The invention discloses an extraction agent for precious metal separation and a method for extracting and separating precious metals by using the extraction agent. In the extraction agent, according to alkyl chain selection difference, a load rate of the extraction agent in an organic solvent is improved; moreover, the hydrophobic property is improved; due to the stability of a chemical structure,the reusability of the extraction agent is correspondingly improved, and environmental protection is realized; by controlling a hydrochloric acid concentration, separation between gold and other precious metals and / or between other metals, platinum, palladium and rhodium and other precious metals can be realized. The extraction separation method has the following advantages: (1) the novel extraction agent is synthesized according to a simple method; (2) the gold is extracted and separated in a solution extraction manner; (3) back extraction of the gold and other metals and / or other precious metals is realized by virtue of thiourea and other back extraction agents; (4) repetitive experiments prove that the process method is simple, environmentally friendly and convenient to operate, and actual industrial production can be realized.

Description

technical field [0001] The invention belongs to the technical field of extraction, and relates to an extraction agent for separating precious metals, a preparation method thereof, and a method for extracting and separating precious metals using the extraction agent. Background technique [0002] Precious metal (precious metal or noble metal) is a kind of strategic reserve material, mainly including 8 kinds of metal elements such as gold, silver and platinum group metals. Due to its extremely stable physical and chemical properties, it is often used as precious jewelry boxes, currency, etc.; in addition, in modern technology, precious metals are mainly used in industrial and scientific research, including aerospace, navigation, chemical industry, electronics, metallurgy etc. Due to the scarcity of precious metal resources and wide application performance, research and development of precious metal mining and secondary resource recovery technologies are urgently needed. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/06C22B3/34
CPCC22B11/04C22B11/06C22B3/302C22B3/32C22B3/34Y02P10/20
Inventor 赵志钢杨帆陈鹏
Owner 中科新镧系(厦门)科技有限公司
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