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Clean gold extraction device and method

The technology of an extraction device and an extraction method is applied in the field of clean gold extraction devices, which can solve the problems of low leaching efficiency of refractory ore, high toxicity, and pollution of the environment by the gold extraction process, and achieves increased solubility, increased mass transfer efficiency, and improved leaching. effect of speed

Active Publication Date: 2016-12-07
和晶(上海)新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a clean gold extraction device and method for solving the problems of environmental pollution, high toxicity, and low leaching efficiency of refractory ores without pretreatment in traditional gold extraction processes.

Method used

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  • Clean gold extraction device and method

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Experimental program
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Embodiment 1

[0064] The present invention provides a clean gold extraction device, please refer to figure 1 , is a schematic structural diagram of the device, including a dosing system, a reaction tank 3, a solid-liquid separation system, a micro-nano bubble generating device 6, and a gold adsorption system 7.

[0065] Specifically, the reaction tank 3 is provided with a pH meter 8 and a feed port 9, the feed port 9 is used to add mineral powder to the reaction tank 3, and the pH meter 8 is used to measure the mixed liquid in the reaction tank 3. pH value.

[0066] Specifically, the dosing system is connected to the reaction tank 3 for adding gold extractant to the reaction tank 3 .

[0067] As an example, the dosing system includes a dosing tank 1 and a dosing pump 2 ; the dosing pump 2 is connected between the dosing tank 1 and the reaction tank 3 . Valves are provided before and after the dosing pump 2, and after the gold extractant is prepared in the medicine tank 1, the front and re...

Embodiment 2

[0086] The present invention also provides a gold extraction method. The gold extraction method adopts the clean gold extraction device described in any one of Embodiment 1.

[0087] see figure 2 , shown as a process flow chart of the gold extraction method, comprising the steps:

[0088] First execute step S1: add gold-containing ore powder into the reaction tank, and add gold extractant to the reaction tank through the dosing system, so that the ore powder reaches a preset concentration.

[0089] Specifically, the gold-containing ore powder can be any gold-containing ore powder, which can be obtained by pulverizing gold-containing ore. The average particle size of the mineral powder is preferably 0.1-500 μm. The gold extractant can adopt any existing gold extractant. In this embodiment, the gold extractant is preferably a cyanide-free extractant to reduce environmental pollution.

[0090] As an example, the cyanide-free extractant contains amino acid with a mass fraction ...

Embodiment 3

[0105] Sulfur-containing gold ore, its main components are 65% of quartz, 8% of kaolinite, 20% of pyrophyllite, and 8% of pyrite. After powdering, the particle size is less than 74 μm. Configure a cyanide-free extractant in the dosing tank, the concentration of glycine is 0.75%, the pH is adjusted to 11-12 with sodium hydroxide, it is injected into the reaction tank through the dosing pump, the concentration of mineral powder is controlled at 5%, and the dosing pump is turned off. Turn on the ceramic membrane separation system and the gas-liquid mixing pump to ensure a liquid-gas ratio of 10:1 and maintain a pressure of 0.3MPa. After 8 hours of reaction, open the front and rear valves of the modified PAN membrane adsorption system, and start to absorb while leaching. After 24 hours, the leaching rate of the obtained mineral powder is greater than 90%. Gold adsorbed by PAN membrane can be desorbed with glycine.

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Abstract

The invention provides a clean gold extraction device and method. The clean gold extraction device comprises a chemical adding system, a reaction tank, a solid-liquid separation system, a micro nanobubble generation device and a gold adsorption system. According to the device and method, gold extraction is carried out by using micro nanobubbles as an oxidizing agent source, and a large number of hydroxyl radicals can be generated through excitation. The hydroxyl radicals have the strong oxidizing property, so that the leaching rate of mineral powder is greatly increased. Moreover, the mass transfer efficiency of reactions is greatly improved because of particularly small bubbles. An amino acid gold extraction agent which is non-toxic to the environment is also adopted. The amino acid gold extraction agent is environmentally friendly and non-toxic. Waste water can be discharged through simple treatment. Leaching and adsorption can be conducted simultaneously. The production efficiency is improved. By adopting the clean gold extraction device and the gold extraction method adopting the cyanide-free amino acid gold extraction agent and modified PAN adsorption films, the leaching rate of gold ores easy to leach can be made greater than 90%, and the leaching rate of non-pretreated gold ores hard to leach is made to greater than 85%.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy and relates to a clean gold extraction device and method. Background technique [0002] Cyanide gold extraction process is the main method to extract gold from ore or concentrate. Since the world's first cyanide gold extraction plant was built in New Zealand's Kruen Mine in 1889, the cyanide gold extraction has a history of more than 100 years. The cyanide gold extraction has the characteristics of high recovery rate and wide adaptability of ore. . However, due to the highly toxic properties of cyanide, the production, transportation, storage, use and cyanide-containing wastes of cyanide all pose a huge threat to the environment and human health. Gold extraction by heap leaching poses a huge threat to surface water, groundwater and soil. Nowadays, people pay more and more attention to environmental protection, so the use of cyanide will be more and more restricted. [0003] In addition, cyanide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/12C22B3/24C22B3/02
CPCC22B3/02C22B3/12C22B3/22C22B11/04Y02P10/20
Inventor 姜标李继香赵延琴
Owner 和晶(上海)新能源科技有限公司
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