Gold extraction technique method for low-grade refractory gold ores

A process method and low-grade technology, applied in the direction of improving process efficiency, etc., can solve problems such as difficult to apply and difficult gold concentrate, and achieve low production cost, low cost, and mild conditions

Active Publication Date: 2015-11-11
CHANGSHA RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this technical solution are mainly reflected in the need for pre-flotation and enrichment to obtain gold concentrate. For raw ore or cyanide tailings with fine-grained sulfide-coated gold, the particle size of sulfide is extremely fine, which exceeds the applicable particle size of conventional flotation. , it is usually difficult to obtain gold concentrate by means of flotation. Therefore, this technical solution is difficult to apply to fine-grained sulfide-coated gold ore or cyanide tailings

Method used

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  • Gold extraction technique method for low-grade refractory gold ores
  • Gold extraction technique method for low-grade refractory gold ores
  • Gold extraction technique method for low-grade refractory gold ores

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Embodiment 1

[0066] a kind of like Figure 13 The gold extraction process of the low-grade refractory gold ore of the present invention shown, may further comprise the steps:

[0067] (1) Finely grind the above-mentioned raw ore containing fine-grained sulfide-coated gold; the fine grinding is to adopt a micron-level ultra-fine stirring mill (such as the technical solution disclosed in No. ZL201010558281.4 Chinese Patent), and the grinding concentration is 50% , Grinding fineness D90=9.27μm;

[0068] (2) Add the finely ground raw ore into the intensified agitation and aeration reaction device of the present invention, and at normal pressure and 50° C., feed air and stir to carry out pre-oxidation; the oxidant is air, and the flow rate is 0.10 m 3 / h, the liquid-solid ratio of pre-oxidation, alkali treatment and leaching is 2:1, and the pre-oxidation time is 24 hours;

[0069] (3) Add calcium oxide to the above-mentioned pre-oxidized ore pulp for sufficient alkali treatment; the dosage of...

Embodiment 2

[0072] a kind of like Figure 13 The gold extraction process of the low-grade refractory gold ore of the present invention shown, may further comprise the steps:

[0073] (1) Finely grind the above-mentioned raw ore containing fine-grained sulfide-coated gold; the fine grinding is to adopt a micron-level ultra-fine stirring grinder, the grinding concentration is 50%, and the grinding fineness D90=9.27 μm;

[0074] (2) Add the finely ground raw ore into the intensified stirring aeration reaction device of the present invention, and at normal pressure and 100° C., feed oxygen and stir to carry out pre-oxidation; the oxidant is oxygen, and the flow rate is 0.20 m 3 / h, the liquid-solid ratio of pre-oxidation, alkali treatment and leaching is 5:1, and the pre-oxidation time is 4 hours;

[0075] (3) Add calcium oxide to the above-mentioned pre-oxidized ore pulp for sufficient alkali treatment; the dosage of calcium oxide is 20kg / t, the pH value is 11-12, and the alkali treatment t...

Embodiment 3

[0078] a kind of like Figure 13 The gold extraction process of the low-grade refractory gold ore of the present invention shown, may further comprise the steps:

[0079] (1) Finely grind the above-mentioned raw ore containing fine-grained sulfide-coated gold; the fine grinding is to adopt a micron-level ultra-fine stirring grinder, the grinding concentration is 50%, and the grinding fineness D90=9.27 μm;

[0080] (2) Add the finely ground raw ore into the intensified agitation and aeration reaction device of the present invention, and at normal pressure and 10° C., feed air and stir to carry out pre-oxidation; the oxidant is air, and the flow rate is 0.10 m 3 / h, the liquid-solid ratio of pre-oxidation, alkali treatment and leaching is 2:1, and the pre-oxidation time is 24 hours;

[0081] (3) Add calcium oxide to the above-mentioned pre-oxidized ore pulp for sufficient alkali treatment; the dosage of calcium oxide is 10.35kg / t, the pH value is 11-12, and the alkali treatment...

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Abstract

The invention discloses a gold extraction technique method for low-grade refractory gold ores. The method comprises the following steps: raw ores or cyanide tailings containing micro-fine particle sulfide-encapsulated gold are finely grinded; the finely grinded raw ores or cyanide tailings are added into an intense agitation inflation reaction device, and are mixed with water to form pulp; under an ordinary pressure at a temperature of 10 DEG C-100 DEG C, air or oxygen is introduced and mixing is performed so as to perform pre-oxidation; calcium oxide is added into the above mentioned pre-oxidized pulp to perform adequate alkali treatment; NaCN is added into the pulp subjected to alkali treatment for cyanide leaching, and finally, gold extraction is performed by using activated carbon for adsorption. The method disclosed by the invention has the advantages of low investment, low cost, simple equipment, mild conditions, high resource recovery rate and the like.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of mineral resources, in particular to a process for extracting gold from refractory gold ore. Background technique [0002] With the increasing demand for resources in economic and social development, more and more mineral resources are exploited and utilized, and more and more tailings are produced at the same time. The development and utilization of valuable metals contained in these tailings issues are also attracting increasing attention. [0003] As of 2013, my country's gold output has ranked first in the world for seven consecutive years, and it has also produced a large number of gold tailings. Among them, the national gold tailings discharge reached 94.83 million tons in 2012 alone, and the historical cumulative amount is even higher. is amazing. Due to the restriction of the nature of the raw ore and the level of gold extraction technology at that time, the gold conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/08
CPCY02P10/20
Inventor 肖松文陈坚王奉刚赵卫夺潘炳夏星
Owner CHANGSHA RES INST OF MINING & METALLURGY
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