Method for preparing iron oxide red by carrying out reducing roasting on high-sulfur gold concentrate and enhancing acid solution

A technology of gold concentrate and acid solution is applied in the field of preparing iron red from leaching solution obtained by strengthening acid dissolution with hydrochloric acid, and can solve the problems of waste of resources, less than 80%, and difficulty in improving gold leaching rate.

Inactive Publication Date: 2012-09-26
CENT SOUTH UNIV
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Problems solved by technology

However, due to the high-temperature roasting process, the gold in the calcined sand is wrapped by the fusible glass body during the high-temperature process, making it difficult to increase the gold leaching rate during the subsequent cyanidation treatment, and the gold content in the tailings after cyanidation is still 10-20g / t, gold recovery rate is less than 80%, serious waste of resources

Method used

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  • Method for preparing iron oxide red by carrying out reducing roasting on high-sulfur gold concentrate and enhancing acid solution
  • Method for preparing iron oxide red by carrying out reducing roasting on high-sulfur gold concentrate and enhancing acid solution

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Embodiment 1

[0043] A method for preparing iron red from high-sulfur gold concentrate calcine reduction roasting intensified acid solution includes the following steps:

[0044] First, the sulfur-containing gold concentrate calcine and the reducing agent are mixed and then placed in a reduction roaster for roasting; the reduced roasted calcine is acid-leached with hydrochloric acid; then the acid-leached reduced calcine is filtered, and after filtering Take 1m 3 The hydrochloric acid leachate contains Fe 110g / L, As 0.95g / L, Si 0.098g / L, and Cu1.8g / L. Adjust pH to 3.0 with ammonia water, add 1kg polyacrylamide, and blow Fe 2+ Oxidize until its concentration drops to 109g / L, coagulate for 35min, clarify and filter. Add 2kg of iron powder to the supernatant to replace copper. Spray thermal decomposition at 700℃ to obtain iron red Fe 2 O 3 And hydrochloric acid. Iron red meets the first-class product requirements in GB / T 1863-2008, the hydrochloric acid regeneration rate is 99.5%, and the coppe...

Embodiment 2

[0046] A method for preparing iron red from high-sulfur gold concentrate calcine reduction roasting intensified acid solution includes the following steps:

[0047] First, the sulfur-containing gold concentrate calcine and the reducing agent are mixed and then placed in a reduction roaster for roasting; the reduced roasted calcine is acid-leached with hydrochloric acid; then the acid-leached reduced calcine is filtered, and after filtering Take 1m 3 The hydrochloric acid leaching solution contains Fe 132g / L, As 1.25g / L, Si 0.11g / L, and Cu3.3g / L. Adjust the pH to 3.0 with ammonia water, add 2.1kg polyacrylamide, and blow the Fe 2+ Oxidize until its concentration drops to 130g / L, coagulate for 60min, clarify and filter. Add 8.5kg iron powder to the supernatant to replace copper. Spray thermal decomposition at 950°C to obtain iron red and hydrochloric acid. Iron red meets the requirements of the first grade product in GB / T 1863-2008, the hydrochloric acid regeneration rate is 99.5...

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Abstract

The invention discloses a method for preparing iron oxide red by carrying out reducing roasting on high-sulfur gold concentrate and enhancing acid solution. In order to increase recovery rate of gold and fully utilize resources as well as realize comprehensive recovery of valuable metals, iron high-value utilization and hydrochloric acid regeneration, the method comprises the steps of: oxidizing partial Fe<2+> in an acid-soluble lixivium into Fe<3+> for removing arsenic and silicon in the solution; clarifying under the action of a flocculating agent; and then replacing copper in supernatant by adopting iron, and carrying out spraying and thermal decomposition on a refined FeCl2 solution generated after replacement to obtain iron oxide red and hydrochloric acid. According to the invention, As and Si in the acid-soluble lixivium can be respectively removed to below 50ppm and 4ppm; the recovery rate of copper is more than 99 percent, and the regeneration rate of hydrochloric acid is more than 99 percent.

Description

Technical field [0001] The invention relates to a method for smelting sulfur-containing gold concentrates, in particular to a method for preparing iron red by using hydrochloric acid to intensify acid dissolution after reduction and roasting with sulfur-containing gold concentrate boiling roasting slag. Background technique [0002] There are a large number of pyrite-type and arsenopyrite-type gold deposits in my country, which can be enriched into high-sulfur gold concentrates through flotation operations, and it is difficult to directly extract gold and silver from them by cyanidation. Boiling roasting can oxidize the sulfur in the concentrate to SO 2 For acid production, the use of two-stage boiling roasting can further remove arsenic from gold concentrates. It is widely used in the smelting process of high-sulfur gold concentrates in my country. However, due to the high temperature roasting process, the gold in the calcine is wrapped by the fusible glass body during the high ...

Claims

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Application Information

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IPC IPC(8): C22B3/46C22B3/10C22B1/02
CPCY02P10/20
Inventor 刘维张杜超刘昭成欧阳彪
Owner CENT SOUTH UNIV
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