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Method for concentrating gold from pyrite inclusion-type gold ore

A wrapped type, pyrite technology, applied in the field of raw material pretreatment and roasting process, can solve the problems of low gold recovery rate, poor stability, large amount of slag, etc., to achieve high gold recovery rate, high stability, and resources The effect of high comprehensive recycling rate

Inactive Publication Date: 2011-05-11
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to solve the problems of insufficient utilization of resources, large amount of slag and poor stability, large amount of waste water discharge, etc. Due to the low gold recovery rate and other shortcomings, a method of enriching gold with pyrite-wrapped gold ore as raw material is proposed to facilitate recovery

Method used

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  • Method for concentrating gold from pyrite inclusion-type gold ore
  • Method for concentrating gold from pyrite inclusion-type gold ore

Examples

Experimental program
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Effect test

example 1

[0020] Example 1: Roasted ore composition is Fe 60.22%, Pb 0.78%, Zn 0.77%, S 0.25%, As 0.063%, Cu 0.061%, P 0.029%, SiO 2 9.38%, Al 2 o 3 1.33%, MgO 0.094%, CaO 1.14, Au 8.28g / t. Using DC electric arc furnace for smelting, under the condition that the mass ratio of roasted ore: coke: lime is 10:3:1, and smelting at 1500 ° C, the iron reduction rate reaches 98%, and 99% of gold is enriched in pig iron. Gold-rich pig iron The composition is: Fe 97.27%, C 1.38%, Si 0.29%, S 0.40%, P 0.052%, Au 13.74g / t. The gold-rich pig iron is cast into the anode, and in the electrolyte system based on ferrous sulfate-ammonium sulfate, the Fe 2+ 80g / L, (NH 4 ) 2 SO 4 80g / L, pH=3.5~4.5, electrolyte temperature 50~60℃, 220~275A / m 2 The current density and the cell voltage of 1.0-1.2V, the center distance of the same pole is set at 110mm, when the diaphragm electrolysis is used, the electrolysis proceeds stably, and the output of pure iron with iron content greater than 99.5% and impuri...

example 2

[0021] Example 2: Roasted ore composition is Fe 60.22%, Pb 0.78%, Zn 0.77%, S 0.25%, As 0.063%, Cu 0.061%, P 0.029%, SiO 2 9.38%, Al 2 o 3 1.33%, MgO 0.094%, CaO 1.14, Au 8.28g / t. Using DC electric arc furnace for smelting, under the condition that the mass ratio of roasted ore: coke: lime is 10:2:3, and smelting at 1550 ° C, the iron reduction rate reaches 95%, and 98% of gold is enriched in pig iron. Gold-rich pig iron The composition is: Fe 94.88%, C 0.44%, Si 2.52%, S 0.56%, P 0.056%, Au 13.73g / t. The gold-rich pig iron is cast into the anode, and in the electrolyte system based on ferrous sulfate-ammonium sulfate, the Fe 2+ 100g / L, (NH 4 ) 2 SO 4 100g / L, pH=3.5~4.5, electrolyte temperature 50~60℃, 220~275A / m 2 The current density and the cell voltage of 1.0-1.2V, the center distance of the same pole is set at 120mm, when the diaphragm electrolysis is used, the electrolysis is carried out stably, and the pure iron with iron content > 99.5% and impurities within th...

example 3

[0022] Example 3: Roasted ore composition is Fe 61.22%, Pb 0.61%, Zn 0.32%, S 0.23%, As 0.17%, Cu 0.035%, P 0.04%, SiO 2 8.15%, Al 2 o 3 1.36%, MgO 0.075%, CaO 0.73%, Au 30.30g / t. Using DC electric arc furnace for smelting, under the condition of roasted ore: coke: lime mass ratio of 10:4:1, smelting at 1500 ° C, the iron reduction rate reaches 99%, and 99% of gold is enriched in pig iron, gold-rich pig iron The composition is: Fe 97.32%, C 1.44%, Si 0.52%, S 0.52%, P 0.053%, Au 49.16g / t. The gold-rich pig iron is cast into the anode, and in the electrolyte system based on ferrous sulfate-ammonium sulfate, the Fe 2+ 100g / L, (NH 4 ) 2 SO 4 100g / L, pH=3.5~4.5, electrolyte temperature 50~60℃, 220~275A / m 2 The current density and the cell voltage of 1.0-1.2V, the center distance of the same pole is set at 11mm, when the diaphragm electrolysis is used, the electrolysis is carried out stably, and the pure iron with iron content greater than 99.5% and impurities within the a...

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Abstract

The invention relates to a method for concentrating gold from pyrite inclusion-type gold ore. The pyrite inclusion-type gold ore is gold-containing sulfur ore with high recovery value. The roasted ore of pyrite inclusion-type gold ore is used as raw material and proportionally mixed with charred coal, lime and quartz; and the resulting mixture is fed into a smelting furnace and undergoes the reduction smelting at a temperature ranging from 1450 DEG C to 1600 DEG C, so as to produce gold-rich pig iron. The gold-rich pig iron as an anode plate is electrolyzed by the diaphragm electrolysis technique in an electrolysis system containing ferrous sulfate or ammonium sulfate aqueous solution, so as to produce electrolytic iron and gold-rich anode mud. The method increases the resource utilization rate and is environment-friendly.

Description

technical field [0001] The invention relates to a metal production method, and to the pretreatment and roasting process of raw materials. Background technique [0002] Pyrite-wrapped gold ores (including gold-bearing sulfur concentrates with gold recovery value) are refractory gold ores, in which iron minerals are mainly pyrite (FeS 2 ) and arsenopyrite (arsenopyrite, FeAsS 2 ), there are two main occurrence states of gold: one is in the form of fine particles wrapped by minerals such as pyrite and arsenopyrite, which is the most important embedded form of gold minerals, and its particle size ranges from submicron to tens of The second type is that gold minerals are distributed along the fine cracks and grain gaps of pyrite and arsenopyrite, which is also the main embedded form of gold minerals, and the particle size of this gold mineral is also from submicron to tens of between microns. The common feature of these two occurrence states of gold is that they are tightly pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B1/00
Inventor 何从行刘志宏刘智勇马小波李启厚朱德庆
Owner CENT SOUTH UNIV
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