Method for regulating pH of low-grade pyrolusite sintering flue gas desulfurization slurry

Abstract

The invention discloses a method for regulating the pH of low-grade pyrolusite sintering flue gas desulfurization slurry. According to the method, low-grade pyrolusite is used as a regulator for the pH of low-grade pyrolusite sintering flue gas desulfurization slurry. The problem that the adoption of lime water as a regulator may easily cause blockage of an absorption system pipeline and a circulating pump, bring new impurities to leaching solution and cause the increase in the amount of slag and the loss of Mn2+ is solved. The problem that the investment in equipment in the subsequent process as well as the energy consumption and the running cost are increased due to the fact that a pH value buffer agent is complex in preparation and more expensive than rhodochrosite is also solved. From the point of view of technological process, the adoption of rhodochrosite as a pulp pH regulator avoids the introduction of new impurities to the system and is conductive to the purification of pyrolusite desulphurization by-products. Moreover, in the ultimate process of controlling waste gas pollution with use of low-grade ore, resourcelized utilization of ultimate disposables is realized.

Description

technical field [0001] The invention relates to a method for adjusting the pH of a desulfurization slurry for desulfurized pyrolusite sintering flue gas, and belongs to the technical field of desulfurization slurry preparation. Background technique [0002] The sintering of "blast furnace-converter" long-process iron and steel enterprises is the emission of SO 2 main process. At present, iron and steel complexes mainly use low-sulfur raw material mixing method, high chimney diffusion dilution method, flue gas desulfurization method and other measures to control SO in the sintering process. 2 emission. The lime method is mostly used in flue gas desulfurization in China, but due to the poor quality of gypsum, there is a problem of secondary pollution. In recent years, new desulfurization methods and technologies have emerged one after another. Iron and steel enterprises should choose desulfurization technologies with low cost, advanced technology, high desulfurization effic...

AI Technical Summary

Problems solved by technology

Coexistence of MnSO in the leaching solution of pyrolusite desulfurization 2 and H 2 SO 4 Two products, H 2 SO 4 The presence of lowers the pH value of the desulfurization system, which seriously hinders the MnO 2 and SO 2 the main reaction process, thereby reducing the SO 2 Solubility and chemical reaction rate in the liquid phase, in addition, the generated sulfuric acid will also increase the consumption of the purification agent for the absorption liquid treatment