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Method for recovery of gold, silver and iron from gold smelting waste residue

A technology for recovering gold and waste slag, which is applied in the fields of chemical industry and metallurgy. It can solve the problems of inability to enrich iron, waste of resources, and inability to effectively oxidize, and achieve the effect of reducing stacking of tailings ponds and waste of resources

Active Publication Date: 2015-06-10
LINGBAO CITY JINYUAN MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing acidification roasting process requires that the roasting temperature of wet feed should not exceed 650°C, so that the rate of sulfur burning out is low, and a small amount of gold and silver are wrapped and cannot be effectively oxidized, and the iron element is oxidized into Fe 2 o 3 , the iron cannot be enriched, and the gold and silver in the waste residue cannot be effectively recovered, resulting in a waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Send 1 ton of gold smelting waste slag into the dryer to fully contact with hot air at 600°C from the hot blast furnace, dry the waste slag, add 180kg of sulfur as fuel, and send it into the fluidized bed furnace for weak oxygen reduction at 840°C Boiling roasting, the oxygen content of the flue gas at the furnace outlet (the volume fraction of oxygen in the flue gas) is 1.0%, and the reaction stops when the color of the slag is dark brown, and the sulfur burns to generate SO 2 , SO 2 Oxidation to SO 3 Used to make sulfuric acid, 0.58 tons of sulfuric acid with a mass fraction of 98% can be produced. Sulfur combustion releases heat to maintain the roasting temperature. The excess heat is recovered by the waste heat boiler to generate medium-pressure steam that can generate electricity at 100 degrees. Fe in the waste residue 2 o 3 reduced to Fe 3 o 4 , enrichment, 0.45 tons of 60wt% iron powder can be recovered. The waste slag enriched with iron is then recycled to...

Embodiment 2

[0012] Send 2 tons of gold smelting waste slag into the dryer to fully contact with 590°C hot air from the hot blast stove, dry the waste slag, add 380kg of sulfur as fuel, and send it into the fluidized bed furnace for weak oxygen reduction at 850°C Boiling roasting, the oxygen content of the flue gas at the furnace outlet (the volume fraction of oxygen in the flue gas) is 2.0%, and the reaction stops when the color of the observed slag is dark brown, and the sulfur burns to generate SO 2 , SO 2 Oxidation to SO 3 Used to make sulfuric acid, 1.18 tons of sulfuric acid with a mass fraction of 98% can be produced. Sulfur combustion releases heat to maintain the roasting temperature. The excess heat is recovered by the waste heat boiler to generate medium-pressure steam that can generate electricity at 210 degrees. Fe in the waste residue 2 o 3 reduced to Fe 3 o 4 , enrichment, 0.95 tons of 60wt% iron powder can be recovered. The waste slag enriched with iron is then r...

Embodiment 3

[0014] Send 3 tons of gold smelting waste slag into the dryer to fully contact with hot air at 610°C from the hot blast stove, dry the waste slag, add 600kg of sulfur as fuel, and send it into the fluidized bed furnace for weak oxygen reduction at 860°C Boiling roasting, the oxygen content of the flue gas at the furnace outlet (the volume fraction of oxygen in the flue gas) is 3.0%, the reaction stops when the slag color is dark brown, and the sulfur burns to form SO 2 , SO 2 Oxidation to SO 3 Used to make sulfuric acid, 1.8 tons of sulfuric acid with a mass fraction of 98% can be produced. Sulfur combustion releases heat to maintain the roasting temperature. The excess heat is recovered by the waste heat boiler to generate medium-pressure steam that can generate electricity at 330 degrees. Fe in the waste residue 2 o 3 reduced to Fe 3 o 4 , enrichment, 1.5 tons of 60wt% iron powder can be recovered. The waste slag enriched with iron is then recycled to gold and silver b...

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PUM

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Abstract

A method for recovery of gold, silver and iron from gold smelting waste residues belongs to the technical fields of chemical industry and metallurgy. A technical scheme is as below: drying gold smelting waste residue and doping sulfur as a fuel, wherein the content of sulfur in the fuel is 18-20 wt%; conducting weak oxygen reduction fluidized bed roasting on the fuel, stopping the reaction until the waste residue turns to dark brown, enriching iron component and sending the waste residue to ironmaking; after iron enrichment, recovering gold and silver from the waste residue through a cyanide replacement method. The method provided by the invention recovers metals of gold, silver and iron, and reduces resource waste and stacking in tailings pond.

Description

technical field [0001] The invention belongs to the technical fields of chemical industry and metallurgy, and in particular relates to a method for recovering gold, silver and iron from gold smelting waste residue. Background technique [0002] After the sulfur-containing gold concentrate is acidified and roasted, after acid leaching to remove copper and cyanide to extract gold and silver, the indicators of the waste residue after the water is removed by a ceramic filter are as follows: Fe: 30-35wt%, Au: 1.5-2.0g / t, Ag: 40~50g / t, CN: 0.7~0.8wt%, S: 1.5~2.0wt%, moisture: 25~26wt%. According to the current environmental protection requirements, a special tailings pond should be built for waste slag stacking; and the requirements for foreign transportation are relatively strict (it must be covered with tarpaulin and cannot be spilled on the road). The existing acidification roasting process requires that the roasting temperature of wet feed should not exceed 650°C, so that th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/06C22B11/08
CPCY02P10/20
Inventor 李满旺杨建高褚长江方世中
Owner LINGBAO CITY JINYUAN MINING