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Method for separating and recovering gold or silver by inner-coupling liquid membrane

A liquid membrane separation and internal coupling technology, applied in the field of internal coupling liquid membrane separation and recovery of gold, and internal coupling liquid membrane separation and recovery of silver, can solve the problems of complex device structure, high cost, difficulty in mass production, etc., and achieve recycling selectivity. High, cost-saving and easy-to-use effects

Inactive Publication Date: 2009-10-07
NANTONG YAWEI MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the separation method carried out by this separation device realizes extraction and stripping at the same time, and solves the problem of short life of the supported liquid film caused by the loss of the membrane solution, the structure of the device is complicated, the cost is high, and it is difficult to scale it up. Mass production affects popularization and application

Method used

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  • Method for separating and recovering gold or silver by inner-coupling liquid membrane
  • Method for separating and recovering gold or silver by inner-coupling liquid membrane
  • Method for separating and recovering gold or silver by inner-coupling liquid membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Embodiment 1: according to the method for above-mentioned recovery gold, implement according to the following steps:

[0040] Step 1. Add KCl and HCl to the feed liquid to be recovered to make the H in the feed liquid phase + The ion concentration is 2mol / L, K + Ion concentration is 2mol / L; liquid film phase 2 is prepared: the liquid film phase is composed of TOA, TBP and organic solvent kerosene, wherein the mass fraction of TOA is 15%, the mass fraction of TBP is 5%, and the rest is kerosene; preparation of back extraction Solution: Mix KCN with a concentration of 0.1mol / L and KCl with a concentration of 2mol / L in a certain proportion.

[0041] Such as image 3 , add a certain volume of liquid film phase 2 into the extraction mixing chamber 1, the extraction clarification chamber 3, the stripping mixing chamber 9 and the stripping clarification chamber 11.

[0042] Step 2, extraction: as figure 1 , the feed liquid is sent into the extraction mixing chamber 1 from ...

Embodiment 2

[0045] Embodiment 2, according to the method for reclaiming gold of above-mentioned embodiment 1, control parameter is as follows:

[0046] Preparation liquid: in the Au to be recovered 3+ Add KCl and HCl to the ionic feed liquid, so that the H in the feed liquid phase + The ion concentration is 3mol / L, K + Ion concentration is 3mol / L; prepare liquid membrane phase 2: mix TOA, TBP and kerosene, wherein the mass fraction of TOA is 5%; KCl is mixed, wherein the concentration of KCN is 0.2mol / L, and the concentration of KCl is 1.5mol / L; During extraction, the rotating speed of magnetic stirrer 6 is controlled at 1200 rev / min; minute. The experimental results show that the recovery rate of gold can reach more than 95% after migrating for 2 hours.

Embodiment 3

[0047] Embodiment 3, according to the method for reclaiming gold of above-mentioned embodiment 1, control parameter is as follows:

[0048] Preparation liquid: in the Au to be recovered 3+ Add KCl and HCl to the ionic feed liquid, so that the H in the feed liquid phase + The ion concentration is 2.4mol / L, K + Ion concentration is 2.5mol / L; prepare liquid film phase 2: mix TOA, TBP and kerosene, wherein the mass fraction of TOA is 7.5%; the mass fraction of TBP is 10%, the rest is kerosene; Mix with KCl, wherein the concentration of KCN is 0.4mol / L, and the concentration of KCl is 1.8mol / L; During extraction, the rotating speed of magnetic stirrer 6 is controlled at 1500 rev / min; During stripping, the rotating speed of electric stirrer 12 is controlled at 1200r / minute. The experimental results show that: after migration for 2 hours, the recovery rate of gold can reach more than 90%, while the migration of copper, zinc, cadmium and lead is less than 5%, thus realizing the se...

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Abstract

The invention discloses a method for separating and recovering gold or silver by an inner-coupling liquid membrane. The method is implemented according to the following steps: feed liquor, liquid membrane phase and strip liquor are prepared; KCl and HCl are added in the feed liquor in which the gold needs to be recovered, thus ensuring that the concentration of H in the feed liquor phase is 2 to 3 mol / L; while KSCN and HNO3 are added in the feed liquor in which the silver needs to be recovered, thus ensuring that the concentration of H in the feed liquor phase is 0.1 to 1 mol / L; the concentration of KCl or KSCN is 2 to 3 mol / L; the liquid membrane phase is prepared by mixing tri-n-octylamine, tributyl phosphate and kerosene; the strip liquor, from which gold is recovered, by mixing KCN with the concentration of 0.10 to 0.50 mol / L and KCl with the concentration of 1 to 2 mol / L, and preparing the stripping solution, from which silver is recovered, by mixing Na2S2O3 with the concentration of 0.10 to 0.50 mol / L and KNO3 with the concentration of 1 to 2 mol / L; extracting; and stripping. By using the method for separating and recovering gold or silver by the inner-coupling liquid membrane, the recovery rate of gold or silver can reach more than 85 percent, and migration of copper, zinc, cadmium and lead is less than 5 percent, thus realizing separation and recovery of gold or silver from copper, zinc, cadmium and lead.

Description

technical field [0001] The invention belongs to the technical field of metal recovery, and relates to an in-coupling liquid membrane separation and recovery technology for precious metals in slag and industrial waste liquid, in particular to a method for in-coupling liquid membrane separation and recovery of gold, and the invention also relates to an in-coupling liquid membrane separation Methods of recycling silver. Background technique [0002] my country is a big consumer of precious metal resources, with an annual consumption of more than 40 tons, accounting for half of the world's total output, while the per capita share is lower than the world's per capita share, mainly relying on imports. Take gold and silver as an example: the gold resources in the world are found to be 89,000 tons, and the gold reserves and the static guarantee period of the reserve base are 19 years and 39 years respectively. It is mainly distributed in South Africa (accounting for 38% of the worl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C22B3/40
CPCY02P10/20
Inventor 姚秉华周双商健付兴隆张磊
Owner NANTONG YAWEI MACHINERY MFG
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