Method for gold recovery and extraction from electronic waste or gold containing minerals, ores and sands

A technology for recovering gold and metals, applied in the field of gold recovery, which can solve the problems of unsustainable environment, unattractive economy, unfavorable environment, etc.

Pending Publication Date: 2020-07-17
YEDA RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing pyrometallurgical processes for recovering Au from e-waste are energy-intensive, while hydrometallurgical processes using chemical leaching agents such as aqua regia (i.e., a mixture of concentrated nitric and hydrochloric acids) involve pollution and are therefore environmentally sensitive. on unsustainable
Also, in some cases, extraction of primary gold from minerals, ores, and sands using existing pyrometallurgical and hydrometallurgical processes may be difficult, environmentally unfriendly, or economically unattractive

Method used

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  • Method for gold recovery and extraction from electronic waste or gold containing minerals, ores and sands
  • Method for gold recovery and extraction from electronic waste or gold containing minerals, ores and sands

Examples

Experimental program
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Effect test

example 1

[0093] Gold recovery from gold-bearing materials

[0094] A study of low temperature chlorine sintering of various industrial samples with 4-12ppm gold content. Experiments were carried out in alumina crucibles at 200-350° C. in a furnace with heating elements (FeCrAl) from Kanthal. The initial sample was 60 g. Chlorine gas is used as the chlorinated reagent and is fed into the furnace in considerable excess. Chlorine consumption is 10ml / min. The duration of the experiment was 1 hour. For experimental reproducibility, each experiment was performed twice. Sublimed products are removed from the reaction zone by gas flow.

[0095] The samples obtained after sintering were analyzed by ICP-MS spectroscopy. The yield of gold extraction from the product free of arsenic and antimony (0.05% As, 0.003% Sb) was 80-90%. Sublimation of non-ferrous metals (Cu, Pb, Ag, Zn) and iron was not detected.

example 2

[0097] Recovery of gold from materials containing arsenic, antimony and gold

[0098] It has been found that the presence of arsenic, antimony or combinations thereof in gold-bearing materials drastically reduces gold recovery from 90% to 30-40%.

[0099] To recover high levels of gold, arsenic and antimony are first removed from the product. The second stage of the process must be a selective gold extraction process as described in Example 1.

[0100] During sintering of materials containing arsenic and antimony (0.6% As, 0.3% Sb) a very high rate of arsenic and antimony sublimation (70-75%) was obtained. At the same time, gold extraction was drastically reduced to 30-40%.

[0101] To prevent the sublimation of arsenic and antimony, preliminary studies have been carried out to remove arsenic and antimony from the starting materials beforehand. Thermodynamic calculations were performed for all reactions. The pre-ground initial sample is 60g (As-0.71%, Sb-0.65%, Cu-11%, Zn-...

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Abstract

A method for recovery of gold from gold-containing materials, such as electronic waste material, minerals and sands is described. The method includes crushing the gold containing material to obtain aparticulate material. The particulate material is then preheated in an oxygen- containing gas environment in a preheating zone. The method also includes mixing the oxidized particulate material with achlorine-containing material and treating the mixture in a reaction zone. The treatment is carried out by heating the mixture to provide thermal decomposition of the chlorine-containing material andproduce a chlorine-containing gas mixture, and by applying an electromagnetic field to the chlorine-containing gas mixture to provide ionization of chlorine. A volatile gold-containing chloride product, produced in the reaction zone as a result of a chemical reaction between gold and chlorine ions, is then cooled to convert the volatile gold- containing chloride product into solid phase gold-containing materials.

Description

technical field [0001] The present invention relates generally to metallurgical techniques for separating and recovering precious and rare metals, and in particular to a method for recovering gold from gold-bearing materials such as industrial waste, minerals, ores and sand. Background technique [0002] As technology advances, the demand for electrical and electronic equipment has increased dramatically. Significant innovations in electrical and electronic technology have shortened the useful life of electrical and electronic equipment, and thus increased the generation of electronic waste (e-waste). Global e-waste production is growing rapidly and is expected to accelerate further in the near future. This results in a large amount of e-waste that needs to be disposed of [A. Khaliq, M.A. Rhamdhani, G. Brooks, S. Masood; Metal Extraction Processes and existing industrial pathways for e-waste: A review and Australian observations (Metal Extraction Processes for Electronic W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/02C22B11/06C22B1/00C22B1/02
CPCC22B1/005C22B1/02C22B11/021C22B11/025C22B11/06Y02P10/20
Inventor I·卢博米尔斯基V·卡普兰N·多斯姆克哈米多夫E·佐尔达斯贝
Owner YEDA RES & DEV CO LTD
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