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

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...

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