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Process for comprehensively recovering gold and copper through combined biological dump leaching of refractory gold concentrate and copper melting slag

A technology of copper smelting slag and refractory gold, which is applied in the technical field of refractory gold concentrate and copper smelting slag combined bioheap leaching to comprehensively recover gold and copper, can solve the problems of low cost and poor permeability, and achieve low cost, Realize the effect of recycling and low energy consumption

Active Publication Date: 2014-08-13
ZIJIN MINING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process uses copper smelting slag as aggregate to solve the problem of poor permeability of gold concentrate bioheap leaching, and utilizes the action of microorganisms to oxidize gold-encapsulated sulfide in gold concentrate. Copper and copper oxides are effectively dissolved under the action of microorganisms and process acid production, simultaneously realizing efficient pre-oxidation of gold minerals wrapped in gold concentrate and effective leaching of copper in each main state of existence, and comprehensive recovery of gold and copper. The process and equipment are simple , less investment, low energy consumption, low cost, easy to implement

Method used

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  • Process for comprehensively recovering gold and copper through combined biological dump leaching of refractory gold concentrate and copper melting slag
  • Process for comprehensively recovering gold and copper through combined biological dump leaching of refractory gold concentrate and copper melting slag
  • Process for comprehensively recovering gold and copper through combined biological dump leaching of refractory gold concentrate and copper melting slag

Examples

Experimental program
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Effect test

Embodiment 1

[0037] It comes from a low-grade refractory gold concentrate in Yunnan. With conventional cyanide leaching, the gold leaching rate is only about 10%, and the sodium cyanide consumption is more than 10kg / t ore. Gold in the gold concentrate is wrapped in pyrite in fine particles, and the chemical composition of the gold concentrate is shown in Table 1.

[0038] Table 1 Chemical composition of a low-grade refractory gold concentrate in Yunnan (%)

[0039]

[0040] *The unit is g.

[0041] Table 2 Chemical composition of a flash slag (%)

[0042]

[0043] Take the copper flash slag described in Table 2, crush it to -40mm, mix it with the low-grade refractory gold concentrate in the above-mentioned Table 1 at a weight ratio of 6:1, and add cement accounting for 3% of the gold concentrate at the same time. Pellets with a particle size of 5-60 mm were made in a drum granulator. Send it to the stockyard with a dump truck to build a 3m-high ore heap, rinse the ore heap with sulf...

Embodiment 2

[0045] It comes from a low-grade refractory gold concentrate in Guizhou. With conventional cyanide leaching, the gold leaching rate is only about 15%, and the sodium cyanide consumption is more than 13kg / t ore. Gold in the gold concentrate is wrapped in pyrite in fine particles, and the chemical composition of the gold concentrate is shown in Table 3.

[0046] Table 3 Chemical composition of a low-grade refractory gold concentrate in Yunnan (%)

[0047]

[0048] *The unit is g / t.

[0049] Table 4 Chemical composition of a certain converter slag (%)

[0050]

[0051] Take the copper converter slag described in Table 4, crush it to -40mm, and mix it with the low-grade refractory gold concentrate in the above Table 3 at a weight ratio of 2:1, and add cement accounting for 8% of the gold concentrate at the same time. Pellets with a particle size of 5-60 mm are made in the granulator. Send it to the stockyard with a belt conveyor to build a 6m-high ore heap, rinse the ore ...

Embodiment 3

[0053] It comes from a low-grade refractory gold concentrate in Gansu. With conventional cyanide leaching, the gold leaching rate is only about 25%, and the sodium cyanide consumption is more than 12kg / t ore. Gold in the gold concentrate is wrapped in pyrite with fine particles, and the chemical composition of the gold concentrate is shown in Table 5.

[0054] Table 5 Chemical composition of a low-grade refractory gold concentrate in Yunnan (%)

[0055]

[0056] *The unit is g / t.

[0057] Table 6 Chemical composition of a Noranda process slag (%)

[0058]

[0059] Take the copper converter slag described in Table 6, crush it to -40mm, and mix it with the low-grade refractory gold concentrate in the above-mentioned Table 5 in a weight ratio of 4:1, and add cement accounting for 5% of the gold concentrate at the same time. Pellets with a particle size of 5-60 mm are made in the granulator. Send it to the stockyard with a belt conveyor to build a 5m-high ore heap, rinse ...

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Abstract

The invention discloses a process for comprehensively recovering gold and copper through the combined biological dump leaching of refractory gold concentrate and copper melting slag. The process comprises the following steps: firstly grinding copper melting slag, then coating the low-grade refractory gold concentrate on the surface of the copper melting slag, curing concentrate particles and piling, conducting acid treatment on the concentrate piles for conducting biological dump leaching, circularly spraying leachate, and conducting copper recovery on copper-rich solution by utilizing a conventional extraction and electrodeposition process. The dump-leached slag is subjected to system transformation, then gold is extracted through dump leaching cyaniding, gold is extracted from the leachate by adopting the conventional carbon adsorption process, and the process can be used for simultaneously recovering gold and copper, is simple in equipment, less in investment, low in energy consumption and cost, and easy to implement.

Description

1. Technical field [0001] The present invention relates to biometallurgy, in particular to a process for the comprehensive recovery of gold and copper by combined biological heap leaching of low-grade refractory gold concentrate and copper smelting slag, specifically a comprehensive bioheap leaching process for refractory gold concentrate and copper smelting slag. Process for recovering gold and copper. 2. Background technology [0002] With the massive exploitation of the world's gold resources, the easy-to-handle gold resources have been exploited, and the low-grade difficult-to-handle gold ore has become an important raw material for gold extraction all over the world. Low-grade refractory gold ores account for as much as 60% of the total gold in the earth's crust. Therefore, the research on the technology of extracting gold from low-grade refractory gold ores has attracted the attention of all countries in the world. , High-efficiency development and utilization of tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18C22B3/26C22B11/08C22B3/24C25C1/12
CPCY02P10/20
Inventor 衷水平黄中省吴智臧宏伍赠玲邹来昌陈景河
Owner ZIJIN MINING GROUP
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