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A method for selectively extracting gold from copper-containing oxidized gold ore with cyanamide

A copper oxidation and selective technology, applied in the direction of improving process efficiency, can solve the problems of high cost, difficult industrial application, long process flow, etc., and achieve the effect of low cost of chemicals

Active Publication Date: 2015-09-30
厦门紫金矿冶技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention mainly overcomes the disadvantages of long process flow, high cost and difficulty in industrial application in the existing processing technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Ammonia selective leaching process:

[0030] 1kg of a copper-containing oxidized gold ore (Au4.56g / t, Cu0.87%), pulp concentration 40%, feeding particle size ~ 200 mesh greater than 90.0%, leaching pH value 11, sodium cyanide and ammonium sulfate in three stages , once every 8 hours on average, the first stage, sodium cyanide 0.5kg / t, ammonium sulfate 3kg / t, the second stage, sodium cyanide 0.3kg / t, ammonium sulfate 1.3kg / t, the third stage, cyanide Sodium chloride is 0.2kg / t, ammonium sulfate is 0.7kg / t, after adding the medicine, continue to roll the bottle for leaching for 72h,

[0031] Add 3.75L of water to the leached pulp for three-stage countercurrent washing, the first stage of underflow concentration is 55%, the washing water-mineral ratio is 3-5:1, the time is 10 hours, and the temperature is 25°C; the second stage of underflow concentration is 52% , the washing water-mineral ratio is 3-5:1, the time is 10 hours, and the temperature is 25°C; the concentration...

Embodiment 2

[0034] 1kg of a copper-containing oxidized gold ore (Au5.25g / t, Cu1.98%), pulp concentration 33.3%, feeding particle size ~200 mesh greater than 90%, leaching pH value 12, sodium cyanide and ammonium sulfate in three stages , once every 12 hours on average, the first stage, sodium cyanide 0.75kg / t, ammonium sulfate 4.80kg / t, the second stage, sodium cyanide 0.45kg / t, ammonium sulfate 2.20kg / t, the third stage, Sodium cyanide is 0.30kg / t, ammonium sulfate is 1.00kg / t, after adding the medicine, continue to roll the bottle for leaching for 48h,

[0035] Add 3.75L water to the leached pulp and wash in three stages of countercurrent, the concentration of the underflow in the first stage is 50%, the ratio of washing water to mineral is 3-5:1, the time is 8 hours, and the temperature is 30°C; the concentration of the underflow in the second stage is 50% , the washing water-mineral ratio is 3-5:1, the time is 8 hours, and the temperature is 30°C; the concentration of the third washin...

Embodiment 3

[0038] 1kg of a copper-containing oxidized gold ore (Au5.20g / t, Cu3.84%), the pulp concentration is 25%, the feed particle size is ~200 mesh, more than 90%, the leaching pH value is 11.5, and sodium cyanide and ammonium sulfate are divided into three stages , once every 10 hours on average, the first stage, sodium cyanide 0.6kg / t, ammonium sulfate 4.2kg / t, the second stage, sodium cyanide 0.375kg / t, ammonium sulfate 1.5kg / t, the third stage, Sodium cyanide 0.275kg / t, ammonium sulfate 1.3kg / t, leaching in roller bottle for 48h after adding the medicine,

[0039] Add 3.75L water to the leached pulp and wash in three stages of countercurrent, the concentration of the underflow in the first stage is 50%, the ratio of washing water to mineral is 3-5:1, the time is 10 hours, and the temperature is 35°C; the concentration of the underflow in the second stage is 50% , the washing water-mineral ratio is 3-5:1, the time is 10 hours, and the temperature is 35°C; the concentration of the th...

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Abstract

The invention relates to an ammonia-cyanide selective gold extraction method for copper-containing oxidized gold ores, and particularly relates to a method for recovering gold from high-copper oxidized gold ores. The method comprises the following steps of: segmented ammonia-cyanide selective leaching of copper-containing oxidized gold ores, three-stage countercurrent washing of leaching ore slurry, active carbon absorption of washing pregnant solution and the like. Compared with the prior art and aiming at the defects of a background technology, the method disclosed by the invention is capable of recovering the valuable metal element gold from the gold ores by adopting the segmented ammonia-cyanide selective leaching of copper-containing oxidized gold ore and the three-stage countercurrent washing of leaching ore slurry. The process has the advantages of maturity in process technology, easiness or industrialization and high adaptive capacity on ores.

Description

technical field [0001] The invention relates to a selective gold extraction test of copper-containing oxidized gold ores, and is particularly significant for high-copper-containing (<5%) refractory oxidized gold ores. Background technique [0002] Copper-containing oxide ores are one of the common refractory gold ores. At present, for copper-containing oxide ores with low copper content and poor economic indicators for step-by-step extraction of copper and gold, the engineering methods mainly use sodium cyanide leaching or ammonium cyanide leaching. Law. Because the ore contains some copper oxide ore, the consumption of sodium cyanide can reach tens of kilograms per ton of ore during the cyanidation leaching method, and the leaching effect is poor, mainly due to the oxidation of copper and cyanide in the ore. Reduction, complexation and other reactions consume a large amount of cyanide and oxygen, which affects the gold leaching process and makes the gold leaching proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/08C22B3/14
CPCY02P10/20
Inventor 黄怀国陈庆根林鸿汉张文波叶志勇熊明李晓伟许晓阳孙艳慧丁文涛
Owner 厦门紫金矿冶技术有限公司