Method for circulative and comprehensive utilization of waste acids generated in acid preparation process through smoke smelting

A technology for smelting flue gas and acid circulation, which is used in the field of sulfur concentrate flotation system liquid purification, smelting flue gas acid production and cyanide tailings flotation copper concentrate, which can solve the impact of surrounding environment, difficult building materials, raw materials, etc. To deal with high cost problems, to reduce pollution, improve economic benefits, and achieve the effect of zero emissions

Inactive Publication Date: 2012-11-21
SHANDONG GUODA GOLD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, in the smelting flue gas acid production industry, sulfur-containing minerals and oxygen in the air are roasted at a certain temperature. The high-temperature flue gas has undergone dry dust removal, electrostatic dust removal, and wet purification to remove impurities that affect the production of sulfuric acid. Wet purification is to fully mix water, dilute acid and mixed flue gas for purification. The acidic wastewater generated during the purification process is usually identified as waste acid. Since the sulfuric acid content of such waste acid is not high, it is usually carried out by lime neutralization method. The treatment not only causes the waste of waste acid and high treatment cost, but also the calc

Method used

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  • Method for circulative and comprehensive utilization of waste acids generated in acid preparation process through smoke smelting
  • Method for circulative and comprehensive utilization of waste acids generated in acid preparation process through smoke smelting
  • Method for circulative and comprehensive utilization of waste acids generated in acid preparation process through smoke smelting

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Effect test

Embodiment 1

[0016] 1) Sulfur-containing minerals (including various non-ferrous metal sulfide ores, pyrite, etc.) roasting flue gas acid production process produces waste acid

[0017] Sulfur-containing minerals are roasted with oxygen in the air at 600-1000°C to produce mixed flue gas containing sulfur dioxide, sulfur trioxide, water, mine dust and other volatile elements, which are sequentially subjected to dry dust removal, electrostatic dust removal, and wet dust removal. Purification removes impurities that affect the production of sulfuric acid. Among them, wet purification is a method of fully mixing the flotation system liquid with the mixed flue gas for purification. The acidic wastewater with a mass percentage of 2-15% sulfuric acid produced during the purification process is waste acid. The waste acid is retained separately; after the removal of impurities, the sulfur dioxide flue gas that meets the needs of sulfuric acid production is used for sulfuric acid production to produc...

Embodiment 2

[0029] 1) Sulfur-containing minerals (including various non-ferrous metal sulfide ores, pyrite, etc.) roasting flue gas acid production process produces waste acid

[0030] Sulfur-containing minerals and oxygen in the air are roasted at 600-1000°C to produce mixed flue gas containing sulfur dioxide, sulfur trioxide, water, mine dust and other volatile elements, which have been subjected to dry dust removal, electrostatic dust removal, and wet dust removal successively. Purification removes impurities that affect the production of sulfuric acid. Among them, wet purification is a method of fully mixing the flotation system liquid with the mixed flue gas for purification. The acidic wastewater with a mass percentage of 2-15% sulfuric acid produced during the purification process is waste acid. The waste acid is retained separately; after the removal of impurities, the sulfur dioxide flue gas that meets the needs of sulfuric acid production is used for sulfuric acid production to p...

Embodiment 3

[0042] 1) Sulfur-containing minerals (including various non-ferrous metal sulfide ores, pyrite, etc.) roasting flue gas acid production process produces waste acid

[0043]Sulfur-containing minerals and oxygen in the air are roasted at 600-1000°C to produce mixed flue gas containing sulfur dioxide, sulfur trioxide, water, mine dust and other volatile elements, which have been subjected to dry dust removal, electrostatic dust removal, and wet dust removal successively. Purification removes impurities that affect the production of sulfuric acid. Among them, wet purification is a method of fully mixing the flotation system liquid with the mixed flue gas for purification. The acidic wastewater with a mass percentage of 2-15% sulfuric acid produced during the purification process is waste acid. The waste acid is retained separately; after the removal of impurities, the sulfur dioxide flue gas that meets the needs of sulfuric acid production is used for sulfuric acid production to pr...

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Abstract

The invention relates to a method for circulative and comprehensive utilization of waste acids generated in the acid preparation process through smoke smelting, and belongs to the technical fields of acid preparation through acid smelting, copper concentrate flotation from cyaniding tailings, and liquid purification of a sulfur concentrate flotation system. According to the invention, the circulative and comprehensive utilization of the waste acids generated in the acid preparation process through the smoke smelting is formed through mixing the waste acids with the cyaniding tailings to control the suitable pH value for floating copper concentrate, floating sulfur concentrate and returning a floatation system liquid to the acid preparation process through the smoke smelting. The method completely combines the comprehensive utilization of the waste acids output in the production of sulfuric acid with the comprehensive recovery technology of a plurality of elements from the cyaniding tailings, and effectively solves technical problems comprising the difficult treatment and difficult comprehensive recovery of the waste acids. The whole process flow of the method is basically circulated in a closed manner through a full wet method, so the circulative and comprehensive utilization efficiency of the waste acids is substantially improved, the zero discharge of wastewater is realized, and the pollution to the surrounding environment is reduced, thereby the economic benefits of enterprises are improved.

Description

technical field [0001] The invention relates to a method for recycling and comprehensive utilization of waste acid produced in the process of producing acid from smelting flue gas, and belongs to the technical field of liquid purification treatment in flotation system of copper concentrate and sulfur concentrate flotation by smelting flue gas and cyanide tailings. Background technique [0002] In recent years, in the smelting flue gas acid production industry, sulfur-containing minerals and oxygen in the air are roasted at a certain temperature. The high-temperature flue gas has undergone dry dust removal, electrostatic dust removal, and wet purification to remove impurities that affect the production of sulfuric acid. Wet purification is to fully mix water, dilute acid and mixed flue gas for purification. The acidic wastewater generated during the purification process is usually identified as waste acid. Since the sulfuric acid content of such waste acid is not high, it is u...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B7/04C22B15/00C01B17/69
CPCY02P10/20
Inventor 徐永祥吕寿明王立新梁志伟
Owner SHANDONG GUODA GOLD
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