Method and device for reducing and baking for high-valent manganese minerals

Abstract

The invention provides a method and a device for reducing and baking for high-valent manganese minerals. The method comprises the following steps: (1) combusting combustible gas and air in a hot blast furnace through a nozzle, controlling coefficient of excess air to ensure that the gas of the hot blast furnace is required reduction atmosphere and temperature, and introducing a fluidized roaster;(2) finely grinding manganese minerals, feeding the manganese minerals into a suspension preheat assembly for sufficient heat exchange in several times, separating gas and mineral powder granules, and feeding the granules into the fluidized roaster for a reduction reaction; and (3) controlling the CO content and solid-gas ratio in the fluidized roaster; reducing manganese mineral powder in the fluidized roaster into acidsoluble manganous oxide, and discharging the manganous oxide from a solid material outlet of a cyclone preheater in the last stage. The device comprises a feed assembly, the suspension preheat assembly, the fluidized roaster, a dust-removal exhaust assembly, a gas feed assembly and a combustion assembly. The method and the device have the advantages of simple and compact structure, low cost, simple and convenient operation, good reduction effect, low energy consumption and the like.

Description

technical field [0001] The present invention mainly relates to the field of electrolytic manganese metal roasting equipment, in particular to a reduction roasting method and device for high-priced manganese minerals, which can be applied to pyrolusite, manganese ore, metamanganate, manganese ore, brown manganese ore or black manganese ore etc. Background technique [0002] In the past, there were several methods of reduction roasting in industry, including reverberatory furnace method, rotary kiln method, etc. The characteristics of the above methods are as follows: [0003] 1. Reverberatory furnace method: the reaction temperature is about 800°C, the reduction is carried out by anthracite coal powder mixed in the ore powder, and the furnace gas can be a neutral or slightly oxidizing atmosphere. The heating and reduction time is as long as 3.5 hours or more. The reducing agent is anthracite coal powder with little coking property, and the general calorific value is between...

AI Technical Summary

Problems solved by technology

Problems in rotary kiln reduction: large investment, easy to form rings, high coal consumption

[0005] At present, there are attempts in the industry to reduce pyrolusite with an externally heated electric rotary kiln and the two-mine method. The former consumes too much electricity, while the latter has a complicated process and a large amount of slag, which all lead to an increase in the reduction cost.

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