Magnesite electric energy light burning shaft kiln

Abstract

The invention belongs to the technical field of light calcined magnesia for refractory industry, and particularly relates to a magnesite electric energy light calcined shaft kiln, a kiln body has a rectangular cross section, is sequentially divided into a preheating zone, a light calcined zone and a cooling zone, and is characterized in that electric energy is used as a heat source, a preheating hollow beam is arranged in the middle of the preheating zone, and a hole is formed in the bottom of the preheating hollow beam; a plurality of groups of parallel electric heating beams are vertically arranged in the light burning zone, and electric heaters are distributed on the electric heating beams; and multiple groups of heat exchangers are arranged in the cooling zone. The product has the beneficial effects that 1) electric energy is creatively used as a heat source for preparing the light calcined magnesia, so that the aim of emission reduction is fulfilled; 2) the heat exchanger is arranged between cold air and hot materials in the cooling zone, hot air serves as heat source air to be conveyed to the preheating zone to preheat the materials, and waste heat utilization is achieved; and 3) the practice proves that the power consumption of the shaft kiln is 1000 Kwh / t per ton of finished products, the standard coal consumption is converted to be 123 kg / t and is about 680 kwh / t lower than that of a magnesite suspension kiln, and the energy-saving and emission-reducing effects are remarkable.

Description

technical field [0001] The invention belongs to the technical field of light-fired magnesia for refractory industry, and in particular relates to a magnesite electric energy light-fired vertical kiln. Background technique [0002] Light burnt magnesium is widely used in many fields such as building materials, chemical industry, metallurgy, medicine, etc. . Light-burned magnesium is calcined magnesite, brucite and magnesium hydroxide extracted from seawater or brine at about 800~1000°C to decompose and discharge CO2 or H2O to obtain light-burned magnesium powder, also known as light-burned oxidation Magnesium, caustic magnesia or lightly burned magnesia, commonly known as bitter earth powder. Lightly burned magnesium powder is loose in texture and has high chemical activity. It can be used to manufacture magnesium cement, magnesite building materials, heat insulation materials, etc., and is an intermediate product of high-quality magnesia produced by two-step calcination. ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a magnesite electric energy light-fired vertical kiln, which overcomes the deficiencies of the prior art, uses electric energy as the calcining heat source, produces no combustion waste gas, and reduces environmental pollution; an air material heat exchanger is arranged in the cooling zone to make the The temperature of the material out of the kiln is lowered, and the hot air returns to preheat the raw material, which solves the problems of large environmental pollution, large heat loss, and low production efficiency caused by conventional fuels in the light-fired shaft kiln.

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