Five-section-type caustic calcined magnesite energy saving and environmental protection shaft kiln

Abstract

The invention discloses a five-section-type caustic calcined magnesite energy saving and environmental protection shaft kiln. The five-section-type caustic calcined magnesite energy saving and environmental protection shaft kiln is characterized in that the kiln is divided into five hot work area sections from top to bottom, and the five hot work area sections are a preheating decomposition zone,a calcination zone, a rear calcination zone, a heat insulation zone and a cooling separation zone sequentially; a balance air-exhaust demodulator 5 is arranged on the upper part in the kiln; a secondary combustion-supporting air distributor and a cooling separator are included; the preheating decomposition zone is located between the balance air-exhaust demodulator and a burner; and the rear calcination zone is located between the burner 7 at the lower part in the kiln and the secondary combustion-supporting air distributor 9, the heat insulation zone is located at the lower part of the rear calcination zone, and the cooling separation zone is located at the lower part of a kiln body. The five-section-type caustic calcined magnesite energy saving and environmental protection shaft kiln hasthe advantages that when passing through the calcination zone, preheated magnesite can be evenly calcinated, and the phenomena of deviant fire and deviant combustion are avoided. One of the outstanding characteristics of the five-section-type caustic calcined magnesite energy saving and environmental protection shaft kiln is the heat insulation zone, the heat insulation zone is arranged accordingto the sintering characteristic of the caustic calcined magnesite, undecomposed magnesium carbonate can be decomposed at the heat insulation zone, and the yield is further increased.

Description

technical field [0001] The invention belongs to the technical field of kilns for calcining magnesite. The magnesite mined in a mine is calcined in a kiln to produce a light-burned magnesia product, and in particular relates to a five-stage light-burned magnesite energy-saving and environment-friendly vertical kiln. Background technique [0002] Light-burned magnesia is the main raw material of mid-grade magnesia, high-purity magnesia, and fused magnesia, as well as the main raw material of magnesium chemical industry and magnesium building materials. At present, the main kilns of domestic light-fired magnesia are reverberatory kilns and ordinary shaft kilns. The lower part of the improved combustion gas reflection kiln grate is the combustion chamber, the burner is installed on the wall, and the storage hopper is under the combustion chamber. When discharging, the material is manually inserted into the storage hopper from the bottom of the grate, which is intermittent discha...

AI Technical Summary

Problems solved by technology

[0003] (1) The production capacity of the reverberatory kiln is small, generally 20-40t / d, and the degree of automation is low;

[0004] (2) Ore raw materials are limited, requiring 200-300mm block material, which wastes mineral resources;

[0005] (3) The heat on the top of the kiln is directly discharged into the atmosphere from the chimney and the charging port, resulting in waste of heat energy, and the heat in the storage hopper at the bottom of the kiln cannot be effectively utilized, resulting in high energy consumption and serious environmental pollution;

[0006] (4) The burner is installed on the wall and the material is heated unevenly, resulting in unstable product quality;

[0007] (5) Dust cannot be recycled, polluting the environment

[0008] (6) Poor working environment and high labor intensity

[0010] (1) The uneven distribution of upward cooling air on the kiln section leads to uneven calcination and unstable quality;

[0011] (2) Poor air permeability of the cooling zone leads to poor cooling effect of the finished product

Creates waste and lowers average grade

[0013] (4) Since there are only three sections of preheating, calcination, and cooling, the quality of finished products, energy saving and environmental protection are not ideal

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