Beneficiation method for comprehensive recovery of valuable metals from sulfuric acid residues through chlorination and segregation

A valuable metal and ore dressing method technology, applied in the direction of flotation, solid separation, process efficiency improvement, etc., to achieve comprehensive recovery, resource utilization, and good economic benefits

Inactive Publication Date: 2011-10-19
昆明晶石矿冶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for the comprehensive recovery of valuable metals by chlorination and separation of sulfuric acid slag, so as to solve the environmental and social problems caused by a large amount of sulfuric acid slag, and at the same time recover the valuable element iron in the slag to produce qualified Iron concentrate powder, and at the same time achieve better comprehensive recovery of associated valuable metals copper, tin, silver, antimony, etc.

Method used

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  • Beneficiation method for comprehensive recovery of valuable metals from sulfuric acid residues through chlorination and segregation
  • Beneficiation method for comprehensive recovery of valuable metals from sulfuric acid residues through chlorination and segregation
  • Beneficiation method for comprehensive recovery of valuable metals from sulfuric acid residues through chlorination and segregation

Examples

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Embodiment 1

[0019] The ore sample (sulfuric acid slag) comes from a certain place in Yunnan. The raw ore contains 56.94% iron, 2.14% sulfur, and 1.96% arsenic. It belongs to the high-sulfur, high-arsenic and copper-containing sulfuric acid slag. Crush the ore sample until the particle size is less than 5mm, and prepare the ore sample with a particle size of -100 mesh through pulverizing equipment. The amount of coke is 6% (relative to the mass fraction of the ore, the same below), and the amount of calcium chloride is 8% (relative to The mass fraction of the ore, the same below), the coke particle size is -0.5mm, the ore sample, coke, and calcium chloride are mixed, and the pellets are prepared by pelletizing equipment; the pellets are placed in a roaster for chlorination and segregation Roasting, the roasting temperature is 1050°C, and the roasting time is 50 minutes; the chlorinated and separated products in the roasting furnace are quenched in water, and the time is less than 15 seconds...

Embodiment 2

[0022] The ore sample comes from a certain place in Sichuan. The raw ore contains 46.94% iron, 0.34% sulfur, 1.96% arsenic, 0.6% copper and 0.40% tin. Crush the ore sample until the particle size is less than 5mm, and prepare the ore sample with a particle size of -100 mesh through pulverizing equipment. The amount of coke is 5%, the amount of calcium chloride is 8%, and the particle size of coke is -0.5mm. Calcium chloride is mixed evenly, and pelletizing equipment is used to prepare pellets; the pellets are placed in a roaster for chlorination and segregation roasting, the roasting temperature is 900 ° C, and the roasting time is 120 minutes; the products chlorinated and isolated in the roaster are quenched in water , the time is less than 15 seconds; the grinding machine grinds the segregated product to a particle size of -0.154mm, flotation recovers copper to obtain copper concentrate, magnetic separation process recovers iron to obtain iron concentrate, and tail gas recove...

Embodiment 3

[0025] The ore sample comes from a certain place in Guizhou. The raw ore contains 52.94% iron, 1.66% arsenic, 0.6% copper, and 80g / t silver. It belongs to high-arsenic copper-silver sulfate slag. Crush the ore sample until the particle size is less than 5mm, and prepare the ore sample with a particle size of -100 mesh through pulverizing equipment. The amount of coke is 2%, the amount of calcium chloride is 3%, and the particle size of coke is -0.5mm. Calcium chloride is mixed evenly, and pelletizing equipment is used to prepare pellets; the pellets are placed in a roaster for chlorination and segregation roasting, the roasting temperature is 1000 ° C, and the roasting time is 80 minutes; the products chlorinated and isolated in the roaster are quenched in water , the time is less than 15 seconds; the ore mill grinds the segregated product to a particle size of -0.154mm, the flotation recovers copper to obtain copper-silver mixed concentrate, and the magnetic separation process...

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Abstract

The invention relates to a beneficiation method for comprehensive recovery of valuable metals from sulfuric acid residues through chlorination and segregation. The method comprises the steps of: crushing sulfuric acid to obtain an ore sample with a particle size of -100 mesh, and uniformly mixing with 1-10% of a reductant coke and 3-10% of calcium chloride to obtain pellets; placing the pellets in a baking furnace for chlorination and segregation baking at the baking temperature of 900-1150 DEG C and the baking time of 45-120 minutes; quenching the chlorinated and segregated product from the baking furnace with water, and carrying out flotation of the water-quenched product to obtain copper concentrate; carrying out magnetic separation on the flotation tailing to obtain iron concentrate; and carrying out solid-gas separation on exhaust gases generated by the baking furnace to obtain solid tin concentrate. The beneficiation method for comprehensive recovery of valuable metals from sulfuric acid residues through chlorination and segregation provided by the invention solves the environmental problem caused by stacking of numerous sulfuric acid residues, simultaneously recovers valuable element iron from the residues to generate qualified iron concentrate powder, and simultaneously realizes good comprehensive recovery of associated valuable metals such as Cu, Sn, Ag, Sb, etc.

Description

technical field [0001] The invention relates to the technical field of mineral processing, recovery and beneficiation, in particular to a mineral beneficiation method for comprehensive recovery of valuable metals through chlorination and isolation of sulfuric acid slag. Background technique [0002] Sulfuric acid slag has been used as a raw material for ironmaking for more than 100 years. At present, almost all sulfuric acid residues are used in some countries. China emits more than 3 million tons every year, and only uses more than 1 million tons, and the rest is discharged into the environment. Accumulation will occupy farmland and pollute land; discharge into rivers will pollute water bodies. Sulfuric acid slag contains ferric oxide (Fe 2 o 3 ) 20-50%, silicon dioxide (SiO 2 ) 15-65%, about 10% aluminum oxide, about 5% calcium oxide, less than 5% magnesium oxide, 1-2% sulfur, and generally copper, cobalt, etc. [0003] Sulfuric acid slag has more than ten uses depen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B1/08B03D1/00
CPCY02P10/20
Inventor 张昱
Owner 昆明晶石矿冶有限公司
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