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Method for improving inclusion gold leaching rate

A gold-wrapping and leaching rate technology, which is applied in the field of gold ore extraction technology, can solve the problems of high separation index of subsequent wrapped gold, small ore processing capacity, and low gold leaching rate, so as to achieve wide applicability and large processing capacity of ore , The effect of increasing the leaching rate

Inactive Publication Date: 2013-05-29
SHANDONG QIANSHUN MINING & METALLURGY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pretreatment technologies commonly used at home and abroad include: roasting method, pressurized oxidation method, bacterial oxidation method, chemical oxidation method, etc., but none of these pretreatment technologies can make the subsequent extraction of wrapped gold reach a higher separation index; at present, The domestic traditional wrapped gold extraction methods such as full mud cyanidation leaching, enhanced pretreatment-cyanidation leaching, flotation recovery and other traditional methods have a gold leaching rate of 6.8%~34.5%, and the ore processing volume is small, and the gold leaching rate is generally low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1, the concrete steps of a kind of method of improving the leaching rate of wrapped gold of the present invention are as follows:

[0034] ① Screening and crushing: 10t of wrapped gold ore with a gold content of 4.87g / t is roughly crushed by a PEX250×1200 jaw crusher, and then sieved by a 23mm vibrating screen. The products on the screen enter the CSD75 cone crusher for secondary crushing. The medium crushed product returns to the 23mm vibrating screen to form a closed circuit. The product under the screen enters the 2mm vibrating screen for pre-grading. The pre-graded product on the screen enters the roller crusher for fine crushing. The product is a broken qualified product;

[0035] ② Roasting: After mixing the crushed qualified products in the mixing feeder, transfer them to YZ3226 straight cylinder rotary kiln for roasting, and blow oxygen-enriched air into the preheating zone (standard atmospheric pressure, air: industrial oxygen = 27:1) , the blast in...

Embodiment 2

[0039] Embodiment 2, a kind of concrete steps of the method concrete step of improving the leaching rate of wrapped gold of the present invention are as follows:

[0040] ① Screening and crushing: 50t of wrapped gold ore with a gold content of 4.87g / t is roughly crushed by a PEX250×1200 jaw crusher, and then sieved by a 26mm vibrating screen, and the products on the screen enter a CSD75 cone crusher for secondary crushing. The medium crushed product returns to the 26mm vibrating screen to form a closed circuit. The product under the screen enters the 4mm vibrating screen for pre-grading. The pre-graded product on the screen enters the roller crusher for fine crushing. The product is a broken qualified product;

[0041] ② Roasting: After mixing the crushed qualified products in the mixing feeder, transfer them to YZ3226 straight cylinder rotary kiln for roasting, and blow oxygen-enriched air into the preheating zone (standard atmospheric pressure, air: industrial oxygen = 28:1)...

Embodiment 3

[0045] Embodiment 3, the concrete steps of a kind of method of improving the leaching rate of wrapped gold of the present invention are as follows:

[0046] ① Screening and crushing: 100t of wrapped gold ore with a gold content of 4.87g / t is roughly crushed by a PEX250×1200 jaw crusher, and then sieved by a 25mm vibrating screen, and the products on the screen enter a CSD75 cone crusher for secondary crushing. The medium crushed product returns to the 25mm vibrating screen to form a closed circuit. The product under the screen enters the 3mm vibrating screen for pre-grading. The pre-graded product on the screen enters the roller crusher for fine crushing. The product is a broken qualified product;

[0047] ②Roasting: After mixing the crushed qualified products in the mixing feeder, transfer them to YZ3226 straight cylinder rotary kiln for roasting, and blow oxygen-enriched air into the preheating zone (standard atmospheric pressure, air: industrial oxygen = 27.2:1) , the blas...

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Abstract

The invention provides a method for improving the inclusion gold leaching rate, which comprises the following steps of: (1) screening and crushing: performing coarse crushing, intermediate crushing and fine crushing of inclusion gold to obtain a crushing qualified product; (2) roasting: performing oxidizing roasting of the crushing qualified product by use of oxygen-rich air; (3) finely grinding; (4) carrying out staged leaching: adding protective alkali calcium oxide and sodium cyanide, and leaching in two stages; and (5) separating and extracting to obtain refined gold. The method for improving the inclusion gold leaching rate provided by the invention has a simple technological process, wide in ore applicability and large in treatment capacity; the conditions of the steps such as roasting, staged leaching and the like are easy to control; and the inclusion gold leaching rate reaches about 83% finally, and the gold content of leaching residue is 0.81g / t.

Description

technical field [0001] The invention relates to an extraction process of gold ore, in particular to a method for increasing the leaching rate of wrapped gold. Background technique [0002] There are abundant reserves of wrapped gold ore resources. With the depletion of gold ore resources, the extraction of wrapped gold ore has gradually attracted people's attention. Due to the high content of metal sulfide in this type of ore, strong silicification, and the extremely small particle size of gold, it is mainly in the form of single-layer wrapped gold and double-layer wrapped gold, and the dissociation of wrapped gold and sulfide monomers is difficult. Therefore, the extraction technology of wrapped gold in this type of ore has become a hot issue in the metallurgical field. [0003] At present, the extraction of this type of ore often adopts the extraction method of pretreatment and then leaching of the ore. The pretreatment technologies commonly used at home and abroad incl...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B1/02C22B3/04
CPCY02P10/20
Inventor 冯婕韩京增樊岩李祎
Owner SHANDONG QIANSHUN MINING & METALLURGY SCI
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