Method for poly-generation and large-scale coupling production based on semi coke and magnesium

Abstract

The invention discloses a method for poly-generation and large-scale coupling production based on semi coke and magnesium. The method comprises the following steps: producing semi coke by using low metamorphic coal on a large scale, producing silicon iron by the semi coke instead of coke; reducing magnesium oxide by using the silicon iron to produce a reducing agent of magnesium metal through employing a pidgeon process, a ferrosilicon process or a pyrogenic process; directly leading semi coke furnace exhaust to a dolomite calcining kiln, and burning in combination with a proper volume of air, wherein the heat from combustion can enable the temperature of the dolomite calcining kiln to achieve the decomposition temperature of dolomite; calcining to produce magnesium oxide; mixing magnesium oxide with the silicon iron and pressing into a ball to be loaded to a magnesium reduction furnace; leading semi coke furnace exhaust to a heating furnace system produced in the process of reducing magnesium by the ferrosilicon process; reducing and producing magnesium metal by a heating reduction tank at a high temperature; and recycling afterheat and combustible marketable components after semi coke exhaust is burnt. The clean and large-scale development of magnesium smelting industry of smelting magnesium employing a silicon reduction process is facilitated, grading purification of coal and clean utilization are facilitated, and collaborative innovation and development of a coupling poly-generation industry chain and an industrial cluster of the semi coke and the magnesium metal are facilitated.

Description

technical field [0001] The invention belongs to the technical field of coal upgrading, clean transformation, utilization and co-production of non-ferrous metals, and relates to coal pyrolysis production of semi-coke and pyrolysis (Pidgeon) method of magnesium smelting multi-cogeneration large-scale coupling production technology, especially relates to a semi-coke based on semi-coke and A method for large-scale coupled production of magnesium polygeneration. Background technique [0002] The traditional pyromagnesium smelting process is to produce magnesia (calcined white) by calcining dolomite raw materials at high temperature, and then add magnesia (calcined white) to it by adding ferrosilicon, granulate it and put it into a reduction tank. The outside of the reduction tank is heated to 1200°C and held for a period of time so that the magnesium oxide in the calcined white is reduced to coarse magnesium. The main fuel used in the calcination and thermal reduction process of ...

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Problems solved by technology

[0005] The purpose of the embodiment of the present invention is to provide a method based on the large-scale coupled production of semi-coke and magnesium polygeneration, which aims to solve the high cost of the existing pyro-smelting magnesium, using ferrosilicon as a reducing agent, and the Higher quality requirements, large coke consumption, high coal consumption, high cost, and large emissions restrict the development of the magnesium smelting industry.

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