Electrically heating shaft kiln and production process for light-burned magnesia based thereon

Abstract

The invention relates to an electrically heating shaft kiln and a production process for light-burned magnesia based thereon. The electrically heating shaft kiln comprises a shaft kiln, wherein the shaft kiln is divided into a preheating zone, a calcining zone and a cooling zone from top to bottom; electric heating elements are uniformly arranged in the kiln wall of the calcining zone along a circumferential direction and a height direction; the electric heating elements on a same cross section are connected in series to form a group of heating unit; electric heating elements in adjacent heating units in the height direction are staggerly arranged; electric heating elements in each group of heating unit are isolated by firebrick partition walls; the kiln wall located at the inner sides ofthe electric heating elements is provided with a silicon carbide plate; and a refractory material layer is arranged between the kiln wall located at the outer sides of the electric heating elements and a kiln shell. The electrically heating shaft kiln provided by the invention can produce both light-burned magnesia products with high purity and no pollution and CO2 by-products with high purity, and thoroughly overcomes the general problem of pollution caused by SO2, CO and NOx in the flue gas produced by traditional kilns while utilizing magnesite resources.

Description

technical field [0001] The invention relates to the technical field of light burning of magnesite, in particular to an electric heating shaft kiln and a light burning magnesium oxide production process based thereon. Background technique [0002] Magnesite is one of the advantageous resources in my country, and it is mainly used as a raw material for the production of light-burned magnesia, sintered magnesia, fused magnesia and other refractory products. At present, the domestic production of light-burned magnesia mainly uses fluidized fluidized furnace, suspension furnace, reverberatory kiln, tunnel kiln and rotary kiln, etc., usually using coke or coal powder, heavy oil, natural gas, etc. Environmental protection requirements are getting higher and higher, and there is a large amount of SO in kiln flue gas 2 , CO, NOx, smoke and other harmful substances are difficult to meet the discharge standards, and many enterprises are facing the severe situation of being forced to s...

AI Technical Summary

Problems solved by technology

[0003] The invention provides an electric heating shaft kiln and a light-burned magnesia production process based on it. Electricity is used as a heat source to produce high-purity, non-polluting light-burned magnesia products, and at the same time, it can produce high-purity CO 2 By-products, while utilizing magnesite resources to the greatest extent, it completely solves the SO in the flue gas commonly found in traditional kilns 2 , CO, NOx pollution problems, with significant economic and environmental benefits

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