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A hot-press oxidation pretreatment method for arsenic-containing fine gold ore

A hot-pressed oxidation and pretreatment technology, which is applied in the direction of improving process efficiency, can solve the problems of thick ore pulp, difficulty in arsenic-containing process wastewater treatment and discharge, and large consumption of alkali-adjusting reagents.

Active Publication Date: 2018-10-16
ZIJIN MINING GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Biological oxidation is a new technology, but its oxidation speed is slow, and it often takes several days to get a better gold leaching index; at the same time, the process has poor adaptability to ore, is easily affected by environmental factors, and has poor operation continuity ; In addition, the harmful substance arsenic will be leached in large quantities, and it is difficult to treat arsenic-containing process wastewater to meet the discharge standards
[0004] The hot-pressed oxidation process has the characteristics of fast reaction speed, natural nature, and wide adaptability of the ore. However, due to the high content of sulfur and arsenic in the gold concentrate, a metastable alkali is formed in the hot-pressed oxidation slag during the hot-pressed oxidation process. Formula sulfuric acid, arsenate, and high arsenic leaching rate
The basic sulfuric acid and arsenate in the hot-pressed oxidized slag are easy to react with the alkali-adjusting reagent in the alkali-adjusting operation of the cyanidation gold extraction process, resulting in a large consumption of the alkali-adjusting reagent, and the ore pulp is extremely viscous, and the cyanide gold extraction operation cannot be smooth At the same time, arsenic exists in the cyanide slag in the form of calcium arsenate, and it is easy to react with carbon dioxide in the air to form calcium carbonate and arsenic acid. Metastable basic sulfuric acid and arsenate need to be converted through additional slag conversion treatment operations

Method used

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  • A hot-press oxidation pretreatment method for arsenic-containing fine gold ore
  • A hot-press oxidation pretreatment method for arsenic-containing fine gold ore
  • A hot-press oxidation pretreatment method for arsenic-containing fine gold ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 1 Shown, a kind of hot-press oxidation pretreatment method of arsenic-containing fine gold ore, comprises the following steps:

[0040] (1) Slurry the arsenic-containing fine gold ore until the pulp concentration is 35-45%, and perform acidification treatment to control the pH at 0.8-1.5. When the pH is stable, continue stirring for 1-4 hours to obtain acidified pulp. The above-mentioned arsenic-containing Au 22.3g / t, S24.1%, As 2.5% in fine gold ore;

[0041] (2) Add the above acidified pulp to CuSO 4 to Cu 2+ The concentration is 15-35g / L, and then hot-pressed pre-oxidation is carried out to obtain oxidized ore pulp. The temperature of the hot-pressed pre-oxidation is 220°C, the oxygen partial pressure is 0.8MPa, and the residence time is 1.5h;

[0042] (3) The above-mentioned oxidized ore pulp is densely washed to obtain the underflow oxidized slag (XDR analysis is as follows: image 3 shown) and overflow acid;

[0043](4) carry out alkali adjustm...

Embodiment 2

[0050] Such as figure 1 Shown, a kind of hot-press oxidation pretreatment method of arsenic-containing fine gold ore, comprises the following steps:

[0051] (1) Slurry the arsenic-containing fine gold ore until the pulp concentration is 35-45%, and perform acidification treatment to control the pH at 0.8-1.5. When the pH is stable, continue stirring for 1-4 hours to obtain acidified pulp. The above-mentioned arsenic-containing Au10.9g / t, S8.7%, As5.3% in fine gold ore;

[0052] (2) Add the above acidified pulp to CuSO 4 to Cu 2+ Concentration of 5 ~ 15g / L, then carry out hot-press pre-oxidation to obtain oxidized ore pulp. The temperature of the hot-press pre-oxidation is 210°C, the oxygen partial pressure is 0.5MPa, and the residence time is 2h;

[0053] (3) The above-mentioned oxidized ore pulp is densely washed to obtain the underflow oxidized slag (XDR analysis is as follows: Figure 4 shown) and overflow acid;

[0054] (4) carry out alkali adjustment cyanidation wit...

Embodiment 3

[0061] Such as figure 1 Shown, a kind of hot-press oxidation pretreatment method of arsenic-containing fine gold ore, comprises the following steps:

[0062] (1) Slurry the arsenic-containing fine gold ore until the pulp concentration is 35-45%, and perform acidification treatment to control the pH at 0.8-1.5. When the pH is stable, continue stirring for 1-4 hours to obtain acidified pulp. The above-mentioned arsenic-containing Au16.7g / t, S31.2%, As2.5% in fine gold ore;

[0063] (2) Add the above acidified pulp to CuSO 4 to Cu 2+ The concentration of the hot-pressed pre-oxidation is 15-50g / L, and the oxidized ore pulp is obtained. The temperature of the hot-pressed pre-oxidation is 210-220°C, the oxygen partial pressure is 0.5-0.8MPa, and the residence time is 2h;

[0064] (3) thickly washing the above-mentioned oxidized ore pulp to obtain underflow oxidized slag and overflow acid;

[0065] (4) carry out alkali adjustment cyanidation with above-mentioned underflow oxidati...

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Abstract

The invention discloses a hot-pressing oxidation pretreatment method for arsenic-containing gold concentrates. The method comprises the following steps that (1) the arsenic-containing gold concentrates are prepared into acidized ore pulp; (2) after CuSO4 is added to the acidized ore pulp, the acidized ore pulp and the CuSO4 are subjected to hot-pressing pre-oxidation to obtain oxidized ore pulp; (3) the oxidized ore pulp is subjected to thickening washing to obtain underflow oxidizing slag and overflow acid liquor; (4) the underflow oxidizing slag is subjected to alkali quantity adjustment and cyaniding; (5) the overflow acid liquor is subjected to iron precipitation through a goethite process, and part of sulfate radicals are removed; (6) a material obtained in the step (5) is subjected to thickening to obtain underflow and overflow liquid; (7) the overflow liquid is returned to the step (1) to participate in acidizing treatment; (8) seed crystals in part of the underflow obtained in the step (6) are returned to the step (5) to be subjected to iron precipitation through the goethite process, and the remaining underflow obtained in the step (6) is washed and then stacked in a tailing pond; and (9) the underflow oxidizing slag obtained in the step (3) is subjected to cyanidation leaching.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a hot-pressed oxidation pretreatment method of arsenic-containing fine gold ore. Background technique [0002] With the depletion of easy-to-smelt gold resources, the development and application of refractory gold-bearing sulfide ores has gradually become the main development direction of mines at home and abroad. At the same time, arsenic is a sulfur-loving element, and many sulfide ores are associated with arsenic, and arsenic-containing minerals are often closely associated with sulfide minerals such as pyrite and orpirite, and precious metals such as gold and silver. According to statistics, the arsenic-gold ratio of 5% of the gold resources reaches 2000:1. The existence of arsenic in the ore is brought into the concentrate through the beneficiation operation, which not only affects the quality of the concentrate product, but also has a low valuation coefficient, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/08C22B3/06C22B3/44
CPCC22B3/06C22B3/44C22B11/04C22B11/08Y02P10/20
Inventor 庄荣传黄怀国范道焱王春丁文涛许晓阳叶志勇林鸿汉甘永刚季常青
Owner ZIJIN MINING GROUP