Technology of desulphurization by regenerated ammonia with combined production of calcium sulfate whisker

Abstract

A technology of desulphurization by regenerated ammonia with combined production of calcium sulfate whisker. specifically, calcium carbide slurry is used as a raw material to react with ammonium chloride (or ammonium nitrate) to generate calcium chloride (or calcium nitrate) and simultaneously regenerate ammonia for desulphurization; and after the desulphurization product ammonium sulfite is oxidated to be ammonium sulfate, the ammonium sulfate is reacted with the calcium chloride (or calcium nitrate) to prepare calcium sulfate whisker, wherein the ammonium chloride (or ammonium nitrate) generated by the ammonium sulfate and the calcium chloride ( or calcium nitrate) is recycled. The technology is advantageous in that: (1) the desulfurization rate is more than 95%, and the absorbent ammonia is obtained by regeneration; (2) the regeneration reaction is relatively complete, with the conversion rate of the calcium carbide slurry being more than 95%; (3) the loss of the ammonia is reduced by more than 10%; (4) the desulphurization energy consumption is reduce by more than 10%; (5) the investment on desulphurization equipment is decreased by more than 20%, and the investment on whisker production equipment is decreased by more than 20%; and (6) the obtained calcium sulfate whisker has a high length-diameter ratio which reaches 50-200, high whiteness which reaches 90%, and high purity which reaches 99%.

Description

technical field [0001] The invention belongs to the field of boiler tail gas treatment and new materials. The invention relates to a method for removing sulfur dioxide and producing calcium sulfate whiskers. More specifically, it is a method of using calcium carbide mud as a raw material, regenerating ammonia for desulfurization, and changing ammonium sulfate, a by-product of ammonia desulfurization, into calcium sulfate whiskers. Background technique [0002] More than 90% of my country's energy structure uses coal as power, and burning coal will produce SO 2 , among which the power plant emissions are the largest, by SO 2 The acid rain pollution damage area mainly caused by acid rain has accounted for about 40% of the country's land area, and the economic loss caused by it has reached hundreds of billions of yuan every year in the country. [0003] At present, there are more than 100 methods of flue gas desulfurization in the world, and there are about 20 methods used in...

AI Technical Summary

Problems solved by technology

[0014] The preparation methods of these calcium sulfate whiskers use natural or by-product calcium sulfate dihydrate as raw materials, and there are problems such as refining and impurity removal procedures, low product whiteness, uneven aspect ratio, and high production costs.

Images