Method for recovering sulfur in industrial by-product sulfur-calcium slag by fixed bed

Abstract

The invention discloses a method for recovering sulfur in an industrial by-product sulfur-calcium slag by a fixed bed, comprising the following steps of: uniformly mixing the industrial by-product sulfur-calcium slag with a sulfur increasing agent, and adding into a rapid decomposer to carry out countercurrent heat exchange reaction to obtain calcium oxide and sulfur dioxide flue gas; introducingthe sulfur dioxide flue gas into an activation reduction bed for reaction to obtain sulfur steam flue gas, and cooling the flue gas to recover sulfur. Compared with the prior art, the method has the characteristics of low production cost, high production efficiency and good product quality.

Description

technical field [0001] The invention relates to the field of resource utilization of industrial waste residues, in particular to the utilization of industrial by-product sulfur-calcium residues. Background technique [0002] The industrial by-product sulfur-calcium slag is mainly one of industrial by-product gypsum, dry desulfurization ash or sulfur-fixing slag; the industrial by-product gypsum needs to be dried at 200-500°C to obtain anhydrous gypsum. [0003] Gypsum is a sulfate mineral with the chemical formula CaSO4 xH2O. Gypsum is divided into natural gypsum and industrial by-product gypsum. At present, the raw materials of industrial by-product gypsum are mainly phosphogypsum, desulfurization gypsum, titanium gypsum, and a small amount of fluorine gypsum, citrate gypsum, salt gypsum, etc. Dry desulfurization ash mainly contains calcium sulfite, and the ash obtained by desulfurization of slaked lime and sulfur dioxide in flue gas in a high-humidity absorption tower is...

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Problems solved by technology

The discharge of titanium gypsum not only occupies a large amount of land, but also pollutes the environment

Due to the washing of rainwater, the titanium gypsum on the stacking yard will be lost. At the same time, after the titanium gypsum is washed and soaked by rainwater, soluble harmful substances will dissolve in water, and the flow and circulation of water in the environment will seriously pollute surface water and Groundwater; on the other hand, after the accumulation of titanium gypsum is exposed to the sun and blown by the wind, a small part will be scattered in the atmosphere in powder form and settle on the surface of foreign objects that may come into contact, polluting the environment and threatening health [Li Guozhong, Zhao Shuai, Yu Yang. Application research of titanium gypsum in the field of building materials [J]. Brick and tile, 2008, (3): 58-60]

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