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Technology for smelting difficultly-treated precious metal-containing material

A precious metal and refractory technology, which is applied in the field of smelting process of precious metals and refractory precious metal-containing materials, can solve the problem of high investment and achieve the effect of less investment, strong adaptability and low melting point of lead

Active Publication Date: 2014-10-22
KUNMING ENG & RES INST OF NONFERROUS METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Bacterial method does not work, oxygen pressure leaching is expensive, adding copper and lead to smelting is equivalent to selling raw materials, and there is no copper and lead concentrate raw materials for new copper and lead smelting plants

Method used

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  • Technology for smelting difficultly-treated precious metal-containing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] like figure 1 As shown, for a gold-containing material - cyanide slag, containing 12g / t gold and 30 g / t silver, the main impurities are iron oxide, silicon dioxide, calcium oxide, etc., through phase analysis , the slag type is close to the blast furnace lead slag type, the material contains 1.5% arsenic and 0.5% antimony, and its smelting process includes the following steps

[0024] Step (1): Put the precious metal-containing material into the furnace from the feeding port of the side blowing smelting furnace at the bottom, and at the same time add 15% of the mass of the precious metal-containing material lead, and smelt it under a weak reducing atmosphere at 900°C for 60 minutes to make the gold and silver in the material The precious metals are enriched in the lead liquid to obtain the melt;

[0025] Step (2): discharge the melt obtained in step (1) from the bottom of the melting furnace to the discharge port of the side blowing melting furnace into the electric he...

Embodiment 2

[0030] like figure 1 As shown, for a high-arsenic and high-sulfur refractory gold concentrate, the gold content is about 18g / t, the sulfur content is about 30%, and the arsenic content is about 10%. Its smelting process includes the following steps:

[0031] First, the conventional two-stage roasting process is used to desulfurize and dearsenate;

[0032] Step (1), put the high-temperature roasted ore roasted in the second stage directly into the rotary kiln for smelting, and at the same time add the lead in the lead anode slime containing 15% of the mass of the precious metal material, and smelt it under a weak reducing atmosphere at a smelting temperature of 1200°C 90min, so that precious metals such as gold and silver in the material are enriched in the lead liquid to obtain a melt;

[0033] Step (2): discharge the melt obtained in step (1) from the discharge port of the rotary kiln into the electric heating front bed, heat up to 1300°C, and then stand and separate for 60...

Embodiment 3

[0038] like figure 1 As shown, for a high-arsenic and high-sulfur refractory gold concentrate, the gold content is about 18g / t, the sulfur content is about 30%, and the arsenic content is about 10%. Its smelting process includes the following steps:

[0039] First, the conventional two-stage roasting process is used to desulfurize and dearsenize the raw materials;

[0040] In step (1), the high-temperature roasted ore roasted in the second stage is directly put into the rotary kiln for smelting, and at the same time, metal lead containing 10% of the mass of the precious metal material is added, and the smelting temperature is 1100°C under a weak reducing atmosphere for 45 minutes to make the material Precious metals such as gold and silver are enriched in the lead liquid to obtain a melt;

[0041] Step (2): discharge the melt obtained in step (1) from the discharge port of the rotary kiln into the electric heating front bed, heat up to 1200°C, and then stand and separate for...

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Abstract

The invention provides a technology for smelting a difficultly-treated precious metal-containing material and belongs to the technical field of gold smelting. The technology comprises the following steps of adding a material into a melting device, simultaneously, adding 10-20% by mass of lead into the melting device, and carrying out melting at a temperature of 900-1200 DEG C in a weak reducing atmosphere for 45-90min to obtain melt, feeding the melt into an electrothermal forehearth, heating the melt to a temperature of 1000-1300 DEG C, carrying out standing separation for 30-60min, discharging slag in the upper layer and rich lead in the lower layer, separating lead and precious metal in the rich lead by a vacuum distillation furnace, returning lead to the melting section for recycle, and refining and purifying the precious metal to obtain a high-purity precious metal. The technology has the characteristics of short process, less investment and good adaptability and is conducive to environment protection.

Description

technical field [0001] The invention belongs to the technical field of gold smelting, and specifically relates to a smelting process for refractory precious metal-containing materials, which is used for extracting precious metals such as gold and silver embedded in refractory minerals such as quartz at the particle level. Background technique [0002] About 1 / 3 of the world's total gold production is produced from refractory gold mines. For materials with fine-grained gold content, especially those in which gold is embedded in refractory minerals such as quartz, the cyanide leaching rate is average with traditional techniques. No more than 80%. According to the production practice data of an enterprise, the cyanide leaching rate is only about 60%, and the gold content in cyanide slag is as high as about 15g / t. , and lead to poor economic benefits of production enterprises, and even serious losses. [0003] The invention is mainly used for gold smelting. The current gold sme...

Claims

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Application Information

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IPC IPC(8): C22B11/02
Inventor 汤裕源王旭张玲
Owner KUNMING ENG & RES INST OF NONFERROUS METALLURGY
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