Recycling method of tail gas from pyrolusite reduction and sulfuric acid coproduction in fluidized bed furnace

Abstract

The invention provides a recycling method of tail gas from pyrolusite reduction in a fluidized bed furnace, belonging to the technical field of ore product processing. In order to improve the conversion of manganese peroxide to manganese monoxide in the fluidized bed furnace, the reduction reaction is necessarily carried out under a low-oxygen condition, and the mixed gas formed by air and tail gas of the fluidized bed furnace is blown from the lower segment of the fluidized bed furnace so as to guarantee that the oxygen content in the mixed gas is very low. The technique is simple and easy in operation, has high manganese peroxide conversion rate, recycles the tail gas, and reduces the environmental pollution.

Description

technical field [0001] The invention relates to a tail gas recycling method for reducing pyrolusite by a fluidized fluidized furnace, which greatly reduces the pollution of the tail gas to the environment and belongs to the field of deep processing of mineral products. Background technique [0002] Manganese sulfate is an important basic chemical raw material, which is widely used in chemical fields such as medicine, papermaking, catalyst, feed additives, metallurgical fields such as the production of electrolytic manganese, and the production of other manganese salts. With the increasing use of manganese products in the world and abroad, its production capacity is expanding rapidly. As far as our country is concerned, the development of electrolytic manganese is very rapid, and the production capacity has reached more than 2.3 million tons per year. Many manganese products such as manganese sulfate and electrolytic manganese use divalent manganese as raw materials, such as ...

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Problems solved by technology

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

[0006] The above-mentioned pyrolusite roasting and reduction process requires pulverized coal as a reducing agent, and the production process requires 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

[0007] In addition, the Chinese patent whose publication number is CN101837959A introduces a new method of utilizing sulfur to reduce pyrolusite to co-produce sulfuric acid in a fluidized fluidized furnace. Combusting sulfur as a heat source and reducing agent provides the temperature required for manganese dioxide reduction, which greatly saves fuel and does not require will emit CO 2 And CO exhaust gas, but the tail gas also contains a considerable part of sulfur dioxide, if the tail gas is discharged directly, it will affect the local environment

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