System and method for preparing H2SO4 from sulfur-containing waste

Abstract

The invention relates to a system for preparing H2SO4 from sulfur-containing waste. The system comprises a pretreatment unit; the pretreatment unit comprises a drying machine and a tail gas washing and recycling system; the drying machine comprises a barrel and a rotating shaft; a heating medium is introduced into at least the barrel or the rotating shaft; the rotating shaft can be driven to rotate to stir the sulfur-containing waste in the barrel; the tail gas washing and recycling system comprises a washing device, a pickling device and a tail gas washing device; the washing device is used for washing and cooling tail gas exhausted by the drying machine, the gas inflow end of the washing device is connected with a tail gas exhaust port of the drying machine, and a part of washing mixed liquid generated by tail gas washing is filtered and then supplied to a feeding port of the drying machine; the pickling device is connected with a gas outlet of the washing device and used for neutralizing ammonia in the washed tail gas to generate ammonium sulfate mother liquor; and the tail gas washing device is connected with a gas outlet of the pickling device and is used for washing and cooling pickled tail gas.

Description

technical field [0001] The invention relates to the technical field of desulfurization waste treatment, in particular to a method for producing H 2 SO 4 System and acid production method. Background technique [0002] In chemical industry, metallurgy, coking, power plant and other fields, wet desulfurization process (such as HPF desulfurization process) is widely used for desulfurization. This process produces a large amount of sulfur-containing waste. For example, in a coking plant, a large amount of sulfur mud, sulfur paste, sulfur-containing foam or sulfur-containing mud is produced. These wastes in different states are mainly composed of sulfur, ammonium thiosulfate, ammonium thiocyanate, benzene Composition with a small amount of tar, of course according to different industries, the composition will have some changes, but in the present invention we collectively refer to these wastes in different states as sulfur-containing wastes. Such sulfur-containing waste has lo...

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Problems solved by technology

[0003] Dry acid production produces less dilute acid and is favored. However, in the dry pretreatment process of dry acid production, the tail gas generated is directly discharged, which will easily lead to poor on-site operating environment, serious dust discharge, peculiar smell, and Corrosion, defects that cannot meet environmental protection requirements

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