Method for reducing pyrolusite and co-producing sulfuric acid by utilizing sulfur in fluidized bed furnace

Abstract

The invention discloses a method for reducing pyrolusite and co-producing sulfuric acid by utilizing sulfur in a fluidized bed furnace, which comprises the following steps of: blending the sulfur and the pyrolusite in a certain ratio, conveying the mixture into the fluidized bed furnace, reducing manganese dioxide in the pyrolusite into manganese oxide by using the sulfur and sulfur dioxide generated by combustion, discharging the manganese oxide into sulfuric acid solution or electrolytic manganese anode solution, slurrying and leaching manganese sulfate; and blowing air into the fluidized bed furnace from the upper section thereof, making sublimed sulfur fully combusted, performing temperature reduction and dedusting on sulfur dioxide generated by reaction, conveying the sulfur dioxide to a purification process, and producing the sulfuric acid by a sulfuric acid production process. By utilizing the conventional sulfuric acid producing fluidized bed furnace equipment, the production method can reduce the pyrolusite into the manganese sulfate, also can produce a great deal of sulfuric acid, greatly reduces equipment investment, saves investment, and reduces cost; meanwhile, in the reaction process, waste gas such as CO2, CO and SO2 and dust cannot be discharged, the operating conditions are good, and the environment is not influenced.

Description

technical field [0001] The invention relates to a method for reducing pyrolusite with sulfur, in particular to a method for reducing pyrolusite with sulfur in a fluidized fluidized furnace to co-produce sulfuric acid. Background technique [0002] Manganese sulfate is the main raw material for the preparation of manganese products such as industrial manganese sulfate and electrolytic manganese. It is widely used in chemical fields such as medicine, papermaking, catalysts, feed additives, metallurgical fields such as the production of electrolytic manganese, and the production of other manganese salts. With the sharp decrease of bivalent manganese carbonate ore, tetravalent manganese pyrolusite (mainly manganese dioxide) in nature has become a new resource to replace manganese carbonate ore because of its large amount of ore, high manganese content and low price. However, in the process of using pyrolusite to prepare manganese sulfate, since manganese dioxide is insoluble in ...

AI Technical Summary

Problems solved by technology

This method also produces SO 2 and dust, pollute the environment, labor-intensive

The above-mentioned pyrolusite roasting reduction process needs to consume a large amount of pulverized coal as a reducing agent, the production process has high energy consumption, long process, and produces a large amount of CO 2 , CO and SO 2 Exhaust gas and dust, poor operating conditions, serious environmental pollution