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Process for treating tail gas of rare earth mineral powder and concentrated sulphuric acid roasting process

A roasting process and exhaust gas treatment technology, applied in the field of environmental engineering, to achieve the effect of reducing capacity, volume, avoiding energy consumption and investment

Active Publication Date: 2011-11-23
北京鸿源龙嘉环保科技有限公司
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  • Process for treating tail gas of rare earth mineral powder and concentrated sulphuric acid roasting process
  • Process for treating tail gas of rare earth mineral powder and concentrated sulphuric acid roasting process
  • Process for treating tail gas of rare earth mineral powder and concentrated sulphuric acid roasting process

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Embodiment example

[0058] A roasting project uses concentrated sulfuric acid to roast rare earth concentrates at high temperature. During roasting, sulfuric acid decomposes and sulfuric acid reacts with rare earth minerals to produce sulfur-containing and fluorine-containing tail gas.

[0059]

[0060] 1. Comparison of water saving

[0061] The conventional three-stage spray cooling and acid recovery process cools 15,000m3 / h of flue gas from 300°C to 60-80°C, and the water consumption is about 2t / h. In this way, the water consumption is 48t / h in 24 hours a day, and the water consumption in a year ( Calculated on the basis of 8000 hours), about 16000t / h, ten roasters of the same type in the whole plant, the annual evaporation water consumption is 160000t / h.

[0062] The partition wall is used as a cooler to cool the flue gas from 300°C to 60-80°C. If the inlet temperature of the cooling water is 25°C and the outlet temperature is 30°C, about 120t / h of cooling water is required per hour, but th...

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Abstract

The invention relates to a process for treating tail gas of a rare earth mineral powder and concentrated sulphuric acid roasting process. The process comprises the following steps of: introducing the tail gas of 300 DEG C of the process into a dust remover for dust removal with a machine; then introducing the tail gas into a condenser for cooling, condensing massive sulphuric acid fog and water vapour in the smoke and recycling acid liquor; introducing the cooled smoke into an acid fog collector, collecting acid fog and water fog in the smoke for recycling; boosting the treated smoke by a fan, introducing the treated smoke into a first absorber, washing by diluted acid liquor or process water to remove residual sulphuric acid fog, hydrofluoric acid and fluosilicic acid from the smoke; andthen introducing the smoke into a second absorber, washing the smoke by an alkali washing tower to remove residual sulphuric acid fog, hydrofluoric acid and SO2 gas from the smoke, and discharging the smoke out after defogging. The process provided by the invention can save massive smoke cooling water, produce less waste water, reduce waste water treatment cost, and recycle the side product fluoric acid produced by solid mineral substances, sulphuric acid, hydrofluoric acid and the like in the tail gas as a raw material for recycling fluorine.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to a tail gas treatment process of rare earth mineral powder and concentrated sulfuric acid roasting process. Background technique [0002] 1. General situation of rare earth industry [0003] my country's proven industrial reserves of rare earths are 52 million tons, accounting for about 50% of the world, and it is the country with the most abundant rare earth resources. There are more than 60 mining areas with proven rare earth reserves in the country, distributed in 22 provinces and regions, among which Inner Mongolia has the largest rare earth reserves, accounting for 83% of the country, and the rest are distributed in Sichuan, Shandong, Jiangxi, Guangdong, Guangxi, Fujian, Hunan and other provinces district. [0004] Baotou mixed rare earth mine is the world's largest light rare earth resource. The rare earth minerals are bastnaesite and monazite. The conc...

Claims

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Application Information

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IPC IPC(8): B01D5/00B01D53/78B01D53/50B01D53/68B01D53/18C01B17/90
CPCY02P70/10
Inventor 张志鸿杨自华邢奕
Owner 北京鸿源龙嘉环保科技有限公司
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