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Method for removing fluoride in flue gas during smelting

A technology for smelting flue gas and fluoride, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles, can solve problems such as difficulty in adapting to the fluoride removal process, achieve high use value and promotion, prevent corrosion, and guarantee The effect of normal production

Inactive Publication Date: 2008-10-01
JINCHUAN GROUP LIMITED
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Problems solved by technology

More importantly, the research at that time was carried out under the premise that the fluorine content of the domestic sulfide ore smelting flue gas was low, and it was difficult to adapt to the removal process of fluoride in the smelting flue gas produced by high fluorine-containing sulfide ores.

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  • Method for removing fluoride in flue gas during smelting

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Embodiment

[0036] Smelting flue gas volume is 210,000 Nm 3 / h, the fluoride concentration is 64.38mg / Nm 3 , the circulating acid discharge of the purification section of the acid system is 70m 3 / h. In order to reduce the fluoride content in the flue gas to below the standard, the "three-stage and four-layer fluoride removal" method is adopted while using the above-mentioned cycle acid discharge.

[0037] Select the water glass whose modulus is 2.6, select the addition amount of water glass as 4kg / h, and select the dilution ratio as 1:40. The water glass conveying pump pumps the water glass into the high level tank, and flows from the high level tank into the circulating acid of the turbulent tower and the washing tower. At the same time, adjust the return valve at the outlet of the water glass delivery pump to keep the liquid backflow, so as to promote the dissolution of the water glass.

[0038] Choose quartz stone with a particle size of 40-500mm, and stack it at the bottom of the...

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Abstract

The invention relates to a method for removing fluoride in smelter off-gas, comprising that the smelter off-gas sequentially passes through a rapid washing tower, a washing tower and a cooling tower so as to remove the dust impurities thereof as well as the heat quantity of the off-gas. The method of the invention is characterized in that: (1) water glass is added to the rapid washing tower; (2) the water glass is added to the washing tower; (3) quartz is arranged at the bottom of the cooling tower; (4) the filling material layer of the cooling tower is provided with a glass fibre. By adopting the method of the invention, the fluorine content in the smelter off-gas is controlled within 0.5mg / Nm<3>, which is lower than national standard (3.0mg / Nm<3>), the corrosion of subsequent equipment for preparing acid is prevented, and normal production of the system is ensured. The method is simple and effective, the investment is little and easy to be realized, large equipment or large process change is not required, and the method has extremely high application value and generalization.

Description

technical field [0001] The invention relates to a method for removing fluoride in smelting flue gas. Background technique [0002] Arsenic and fluorine are very harmful substances in sulfuric acid production. People's awareness of the hazards of fluorine compounds in sulfuric acid production has gradually deepened as the purification equipment has been corroded again and again. As early as the early 1950s, a small number of sulfuric acid plants that adopted the pickling purification process realized the existence and seriousness of fluorine when they discovered that the porcelain rings in the purification equipment were corroded. At that time, the research was mainly focused on the development of fluorine-resistant equipment materials. . With the development of modern corrosion-resistant material research technology, a new type of fluorine-resistant and chlorine-resistant glass fiber reinforced plastic (CFRP) has been widely used to protect the purification equipment. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/68
Inventor 刘玉强甘宪福刘世和徐宾彭国华曹伟周洪涛
Owner JINCHUAN GROUP LIMITED
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