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Method for recovery of valuable metal from white smoke and harmless treatment

A technology for harmless treatment of valuable metals, applied in chemical instruments and methods, inorganic chemistry, arsenic compounds, etc., can solve problems such as deteriorating furnace conditions, reducing the processing capacity of smelting furnaces, and endangering safe production

Inactive Publication Date: 2017-06-13
HENAN ZHONGYUAN GOLD SMELTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most smelting enterprises return the arsenic-containing fume to the smelting system for processing, which causes the continuous accumulation of arsenic in the system, reduces the processing capacity of the smelting furnace, and at the same time deteriorates the furnace condition, endangers safe production, and affects the normal production and product quality of the acid production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 500g of white soot (see Table 1 for the composition of white soot), add it into a beaker with 2000ml of water under stirring, then add 22ml of 98% sulfuric acid with a pipette, heat to 95°C, and then add sodium chlorate in portions A total of 15g was leached at 95°C for 2 hours, filtered, and the filter cake was washed with about 300ml of water. The filter cake was dried in an oven to obtain 178.4g of acid leaching residue (see Table 2 for the composition of acid leaching residue). The filtrate and washing liquid were combined to obtain 1920ml of acid leaching residue. Immersion solution, analysis solution copper concentration is 47.74g / L, add 102 grams of iron powder, stir and heat to 50°C for replacement for 1 hour, filter, move the filter cake into a beaker, add 200ml of 10% sodium hydroxide solution, stir and heat to 95°C Leach for 2 hours, then filter and wash with 100ml of water, dry the filter cake in an oven to obtain 100.8 grams of sponge copper (see Table...

Embodiment 2

[0020] Weigh 500g of white soot (see Table 1 for the composition of white soot), add it into a beaker with 2000ml of water under stirring, then add 27.7ml of 98% sulfuric acid with a pipette, heat to 90°C, and then add chloric acid in portions A total of 15g of sodium was leached at 90°C for 3 hours, filtered, and the filter cake was washed with about 300ml of water. The filter cake was dried in an oven to obtain 172.5g of acid leaching residue (see Table 2 for the composition of the acid leaching residue), and the filtrate and lotion were combined to obtain 2010ml Acid dipping solution, the analysis solution copper concentration is 46.95g / L, add 105g of iron powder, stir and heat to 50°C for replacement for 1 hour, filter, move the filter cake into a beaker, add 200ml of 10% sodium hydroxide solution, stir and heat to 95°C ℃ for 2 hours, then filtered and washed with 100ml of water, and the filter cake was dried in an oven to obtain 103.5 grams of sponge copper (see Table 3 fo...

Embodiment 3

[0022] Weigh 500g of white soot (see Table 1 for the composition of white soot), add it into a beaker with 1500ml of water under stirring, then add 25ml of 98% sulfuric acid with a pipette, heat to 90°C, and then add sodium chlorate in portions A total of 15g was leached at 90°C for 3 hours, filtered, and the filter cake was washed with about 400ml of water. The filter cake was dried in an oven to obtain 173.8g of acid leaching residue (see Table 2 for the composition of acid leaching residue). The filtrate and washing liquid were combined to obtain 1750ml of acid leaching residue Immersion solution, analysis solution copper concentration is 47.8g / L, add 92.5 grams of iron powder, stir and heat to 50°C for replacement for 1 hour, filter, move the filter cake into a beaker, add 200ml of 10% sodium hydroxide solution, stir and heat to 95°C Leach for 2 hours, then filter and wash with 100ml of water, dry the filter cake in an oven to obtain 91.9 grams of sponge copper (see Table 3...

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Abstract

The invention discloses a method for recovery of valuable metal from white smoke and harmless treatment. Sodium chlorate is used as an oxidizing agent; sulfuric acid is used for oxidation leaching for the white smoke; the filtration is performed; and acid leaching slag serves as a gold concentrate to feed in a copper concentrate, and is returned to a low blowing smelting furnace of a pyrogenic copper smelting system. Acid leaching liquid is added in iron powder for replacement; obtained arsenic-contained sponge copper is alkalinely leached by sodium hydroxide to remove arsenic; and the arsenic-removed sponge copper is returned to an anode furnace of the pyrogenic copper smelting system for refining. After liquid after replacement is mixed with alkali leaching liquid, the PH value is adjusted by lime milk; then, the mixture is fed in air for oxidation to generate a property-stable iron calcium arsenate compound; arsenic is cured as a stable compound; and a baking-free brick can be further prepared. The method is used for treating the white smoke; the copper recovery rate is higher than 93%; the copper content of sponge copper is higher than 90%; the leaching rate of arsenic is higher than 90%; and such precious metals as gold and silver of the acid leaching slag are highly enriched, can serve as gold concentrates to feed in the copper concentrate, and are returned to a bottom blowing smelting furnace of the pyrogenic copper smelting system.

Description

technical field [0001] The invention relates to a method for treating white smoke and dust of high-arsenic solid waste, in particular to a method for recovering valuable metals from white smoke and dust of pyrometallurgy and harmlessly treating arsenic. Background technique [0002] During the process of pyrometallurgy, the trace amount of arsenic contained in the copper concentrate is enriched in the soot, and the amount of soot produced by each smelter is relatively large, usually accounting for 1-2% of the ore input. Most smelting enterprises return the arsenic-containing fume to the smelting system for processing, which causes the continuous accumulation of arsenic in the system, reduces the processing capacity of the smelting furnace, and deteriorates the furnace condition, endangers safe production, and affects the normal production and product quality of the acid production process. Arsenic in smoke and dust mainly exists in the form of diarsenic trioxide, diarsenic p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B15/00C01G28/02
CPCC01G28/026C22B7/02C22B15/0091Y02P10/20
Inventor 张福元
Owner HENAN ZHONGYUAN GOLD SMELTERY
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