System and method for removing hydrogen sulfide and co-producing calcium carbonate and sulfur from gypsum

Abstract

The invention discloses a system and a method for removing hydrogen sulfide and co-producing calcium carbonate and sulfur from gypsum. The system comprises a reduction calcining furnace which is respectively connected with a gypsum source and an H2S source, a high-temperature separator which is arranged at an outlet of the reduction calcining furnace and is used for carrying out gas-solid separation on a reaction product in the reduction calcining furnace, an H2O-CO2 processor which is used for providing a space for a mixture of calcium sulfide and calcium oxide to react with water and carbondioxide, and a Claus reactor of which the inlet end is respectively communicated with the gas outlet of the high-temperature separator and the gas outlet of the H2O-CO2 processor. According to the process, industrial by-product gypsum difficult to treat and H2S-containing industrial tail gas are subjected to resource synergistic utilization to produce high-value sulfur and calcium carbonate, calcium carbonate can replace limestone to serve as a desulfurization and denitrification agent and can also serve as a catalyst of a coal gasification process, sulfur serves as an important industrial rawmaterial, and both calcium carbonate and sulfur have high utilization value.

Description

technical field [0001] The invention belongs to the field of resource utilization of solid waste, in particular to a system and method for removing hydrogen sulfide from gypsum and co-producing calcium carbonate and sulfur. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] At present, the production of industrial by-product gypsum in my country is about 118 million tons, and the comprehensive utilization rate is only 38%. Among them, about 43 million tons of desulfurized gypsum, with a comprehensive utilization rate of about 56%; about 50 million tons of phosphogypsum, with a comprehensive utilization rate of about 20%; other by-product gypsum is about 25 million tons, with...

AI Technical Summary

Problems solved by technology

Because most of the H in the acidic tail gas 2 The concentration of S is low, and there is no better treatment method at present

[0006] On the other hand, there is a shortage of sulfur resources in my country, and a large amount of sulfur needs to be imported from abroad every year. Sulfur is one of the indispensable chemical raw materials. A large amount of reliance on imports will not only affect the stability of the domestic sulfur market, but also a potential threat to national security. threaten

At present, most of the flue gas sulfur resource utilization technologies in my country are used to prepare sulfuric acid. However, due to the difficulty in storage and transportation of sulfuric acid, it can only be supplied point-to-point, which greatly limits the application range of sulfur resources.

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