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Comprehensive utilization method of acid-making flue gas produced in gold smelting plant

A flue gas and gas technology, applied in the field of comprehensive utilization of flue gas from gold smelters, can solve the problems of adding oxidants, high electricity costs, and high operating costs, and achieve low operating costs, low construction costs, and pollutant removal rates high effect

Inactive Publication Date: 2017-09-05
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods can effectively remove cyanide, but they all need to add oxidant, and the operating cost is relatively high. Among them, the ozone oxidation method requires an ozone generator, and the electricity cost is high during operation.

Method used

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  • Comprehensive utilization method of acid-making flue gas produced in gold smelting plant

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Effect test

Embodiment 1

[0033] In a gold smelting plant, the raw ore contains between 28% and 30% sulfur, and the roasting pretreatment produces a high concentration of sulfur dioxide gas with a concentration of 160,000mg / m 3 to 180000mg / m 3 Among them, vanadium pentoxide catalyst is used to catalyze the oxidation of sulfur dioxide to produce acid, and the concentration of sulfur dioxide in the flue gas of acid production is 1600mg / m 3 to 1800mg / m 3 between. A sodium hydroxide solution with a mass concentration of 10% is configured to absorb the flue gas of acid production, and three-stage absorption is adopted to finally produce a sodium sulfite solution with a mass concentration of 10%. The total cyanide concentration in the cyanide pulp filtrate of the gold smelter is between 800mg / L and 1000mg / L, and the flow rate of the cyanide pulp is 5m 3 / h, pass it into stirring tank 1, and overflow to stirring tank 2 and stirring tank 3 in turn, add an equal amount of sodium sulfite solution to stirring ...

Embodiment 2

[0035] In a gold smelting plant, the raw ore contains between 30% and 32% sulfur, and the roasting pretreatment produces a high concentration of sulfur dioxide gas with a concentration of 180,000mg / m 3 up to 200000mg / m 3 Among them, vanadium pentoxide catalyst is used to catalyze the oxidation of sulfur dioxide to produce acid, and the concentration of sulfur dioxide in the flue gas of acid production is 1800mg / m 3 up to 2000mg / m 3 between. A sodium hydroxide solution with a mass concentration of 10% is configured to absorb the flue gas of acid production, and three-stage absorption is adopted to finally produce a sodium sulfite solution with a mass concentration of 10%. The total cyanide concentration in the cyanide pulp filtrate of the gold smelter is between 900mg / L and 1000mg / L, and the flow rate of the cyanide pulp is 15m 3 / h, pass it into stirring tank 1, and overflow to stirring tank 2 and stirring tank 3 in turn, add an equal amount of sodium sulfite solution to st...

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Abstract

The invention provides a comprehensive utilization method of acid-making flue gas produced in a gold smelting plant. The comprehensive utilization method comprises the following steps: treating cyanide pulp with acid-making waste gas; absorbing sulfur dioxide in lower-concentration acid-making waste gas with a sodium hydroxide solution to produce a high-concentration sodium sulfite solution; removing cyanide from the cyanide pulp produced in the gold smelting plant under the synergistic effect of the sodium sulfite solution and the air; performing filter pressing on the treated pulp; recycling clear liquid produced by filter pressing into a production process flow of the gold smelting plant; piling and storing filter residues in a tailing pond after the filter residues reach a general industrial solid waste standard. The comprehensive utilization method has the advantages of simple process flow, stable treatment effect, high pollutant removing rate, low running cost and low building cost; meanwhile the aim of treating waste by waste is fulfilled.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a method for comprehensive utilization of flue gas from acid production in a gold smelter. Background technique [0002] The main pollutant in the flue gas of acid production in gold smelters is sulfur dioxide. In recent years, the environmental protection department has become more and more strict on the emission of sulfur dioxide, especially in areas such as Beijing, Tianjin and Hebei, where sulfur dioxide has a greater impact on the environment, can produce acid rain, is highly corrosive, and is also more harmful to the human body. Sulfur dioxide stimulates human breathing. system, cornea, etc., can cause respiratory diseases, eye diseases, etc. Therefore, if this problem can be solved, it will be of great significance to the sustainable development of my country's gold industry smelters. [0003] At present, acid flue gas is treated by lye absorption. Thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50C02F9/04C02F103/16C02F101/18
Inventor 李哲浩邱陆明迟崇哲孟凡钰
Owner CHANGCHUN GOLD RES INST
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