Coated biological oxidation pretreatment method of low-level arsenic refractory gold ores

A bio-oxidation, low-grade technology, applied in the direction of improving process efficiency, to achieve the effect of low production cost, easy implementation and low equipment requirements

Active Publication Date: 2011-11-02
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the existing problems in the pretreatment technology of low-grade arsenic-containing refractory gold ores, the ...

Method used

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  • Coated biological oxidation pretreatment method of low-level arsenic refractory gold ores

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Effect test

Embodiment 1

[0029] Using a low-grade arsenic-containing refractory gold ore in Anhui Province, the main element content is Au 1.91g / t, Fe 3.28%, S 3.65%, As 0.388%; the low-grade arsenic-containing refractory gold ore is used as raw material after crushing and screening Separate the finely crushed ore with a particle size of less than 6mm and the crushed ore with a particle size of 6~25mm; the finely crushed ore is finely ground and floated to make flotation gold concentrate, and its main element content is Au 12.3g / t, Fe 34.27%, S 37.4%, As 1.91%;

[0030] Spray evenly on the crushed ore surface with binder water glass to obtain bonded crushed ore, the dosage of water glass is 100L / t crushed ore;

[0031] Use a cylinder granulator to evenly wrap the flotation gold concentrate on the surface of the bonded crushed ore to make a coated ore. The mass ratio of the flotation gold concentrate to the bonded crushed ore is 1:10;

[0032] Build a heap of coated ore, and then spray sulfuric acid o...

Embodiment 2

[0039] Using a low-grade arsenic-containing refractory gold ore in Hunan Province, the main element content is Au 1.74g / t, Fe 2.83%, S 3.17%, As 0.129%; the low-grade arsenic-containing refractory gold ore is used as raw material after crushing and screening Separate the finely crushed ore with a particle size of less than 6mm and the crushed ore with a particle size of 6~25mm; the finely crushed ore is finely ground and flotation to make flotation gold concentrate, and its main element content is Au 22.1g / t, Fe 37.9%, S 39.1%, As 1.395%;

[0040] Spray evenly on the crushed ore surface with binder water glass to obtain bonded crushed ore, the dosage of water glass is 75L / t crushed ore;

[0041] Use a cylinder granulator to evenly wrap the flotation gold concentrate on the surface of the bonded crushed ore to make a coated ore. The mass ratio of the flotation gold concentrate to the bonded crushed ore is 1: 20;

[0042] Build a heap of coated ore, then spray sulfuric acid on ...

Embodiment 3

[0048] Using a low-grade arsenic-containing refractory gold ore in Liaoning Province, the main element content is Au 1.37g / t, Fe 3.24%, S 3.66%, As 0.197%; the low-grade arsenic-containing refractory gold ore is used as raw material after crushing and screening Separate the finely crushed ore with a particle size of less than 6mm and the crushed ore with a particle size of 6~25mm; the finely crushed ore is finely ground and flotation to make flotation gold concentrate, and its main element content is Au 14.1g / t, Fe 36.2%, S 38.2%, As 2.16%;

[0049] Spray evenly on the crushed ore surface with binder water glass to obtain bonded crushed ore, the dosage of water glass is 150L / t crushed ore;

[0050] Use a cylinder granulator to evenly wrap the flotation gold concentrate on the surface of the bonded crushed ore to make a coated ore. The mass ratio of the flotation gold concentrate to the bonded crushed ore is 1:5;

[0051] Build a heap of coated ore, then spray sulfuric acid on...

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Abstract

The invention provides a coated biological oxidation pretreatment method of low-level arsenic refractory gold ores. The method comprises the following steps of: (1) crushing and screening low-level arsenic refractory gold ores to obtain fine ores and ores; making the fine ores into flotation gold concentrate; uniformly spraying sodium silicate adhesive on the surfaces of the fine ores so as to obtain adhesive ores; (2) uniformly coating the flotation gold concentrate on the surfaces of the adhesive ores; (3) after piling the ores, spraying sulfuric acid; (4) spraying bacteria liquid on ore piles; (5) when the arsenic removal rate of the ores in the ore piles is more than 60 % and the desulfurization degree is more than 40 %, stopping the spraying of the bacteria liquid so as to finish biological oxidation pretreatment. By using the method provided by the invention, the recycling rate of the gold can be increased; and the method provided by the invention has the advantages of low production cost, les energy consumption, less drug usage, low labor intensity, simple process flow, low equipment requirement, easiness in implementation and no generation of waste gas.

Description

technical field [0001] The invention relates to a method for biological oxidation pretreatment of refractory gold ore, in particular to a method for coating biological oxidation pretreatment of low-grade arsenic-containing refractory gold ore. Background technique [0002] Most of my country's gold mineral resource reserves are low-grade and refractory resources, and arsenic-containing gold ore is a typical refractory gold ore. Because the gold is microscopic or submicroscopic, it is wrapped by pyrite and arsenopyrite. Before leaching, the ore needs to be pre-oxidized. Biological oxidation pretreatment of refractory gold ore has a high gold leaching rate and is environmentally friendly; however, due to production costs, the economics of treating low-grade refractory gold ore with tank leaching has been questioned. [0003] Bioheap leaching technology is a new technology that combines biological oxidation technology and heap leaching technology. It is still in its infancy. In...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B11/00
CPCY02P10/20
Inventor 杨洪英马鹏程佟琳琳韩战旗陈国宝
Owner NORTHEASTERN UNIV
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