Process for removing sulfur dioxide for smoke using papermaking white mud

Abstract

A craft that makes use of paper making white mud to eliminate sulfur dioxide in soot comprises the steps of: Add the circular water from pellucid pool and white mud to slurry pool; After mixing round, put them to serum pool, put them to desulfurization tower by add-pressure pump to contact with soot; Reacted liquor flow from the bottom of desulfurization tower and go to deposition pool; The circular water goes to pellucid pool to be used again. The present invention uses simple equipment, has high efficiency of desulfurization and low cost. It uses paper making white mud as desulfurization to change waster to treasure and has a large value to apply and extend.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and resource utilization, and relates to a process for removing sulfur dioxide in flue gas by using papermaking white mud. technical background [0002] At present, the wet desulfurization methods at home and abroad mainly include double alkali method (mainly sodium hydroxide and calcium oxide), limestone-gypsum method, magnesium oxide method, etc. The cost of desulfurization is generally about 200 yuan per ton of sulfur dioxide. ~400 yuan. [0003] After the black liquor in the papermaking alkali recovery workshop is concentrated and incinerated, the main components of the melt flowing out from the bottom of the combustion furnace are sodium carbonate and sodium sulfide, which are called green liquor after being dissolved in dilute white liquor. In the caustic chemical section, slaked lime is added to the green liquor to convert sodium carbonate into sodium hydroxide. The clari...

AI Technical Summary

Problems solved by technology

However, as a desulfurizing agent, papermaking white mud can replace the above-mentioned agents. It is used as a comprehensive utilization of waste, and the cost of removing 1 ton of sulfur dioxide is 0.

As a kind of waste, papermaking lime mud is currently treated in the following ways: first, pure wood pulp lime mud can be calcined into lime and recycled, but it requires high recycling costs; second, a small number of qualified papermaking enterprises sometimes It can be sent to the nearby cement factory or brick factory with low requirements to solve the outlet for some lime mud; third, most enterprises still use foreign landfill or directly discharge the lime mud, and as time goes by and pulping alkali recovery With continuous expansion, the resulting secondary pollution of white mud will become increasingly prominent, and a large amount of calcium carbonate resources will also be wasted

Images