Polygeneration system and method for refractory iron ore magnetization roasting

Abstract

The invention relates to the technical fields of energy, chemical industry and metallurgy, and discloses a metallurgy, chemical industry and power polygeneration system and method for magnetic roasting of refractory iron ore. Coal is partially pyrolyzed and gasified, and the pyrolyzed gasified gas is subjected to magnetic roasting of refractory iron ore in a circulating fluidized bed reactor. After magnetization roasting of refractory iron ore, magnetic separation with higher iron grade is obtained. Iron ore powder and magnetite powder are sent to the metallurgical blast furnace for blast furnace ironmaking; the tail gas after magnetization and roasting of refractory iron ore is purified and then enters the chemical reactor to produce chemical products; semi-coke after coal pyrolysis enters the coal-fired boiler Combustion to generate electricity. By constructing a metallurgical, chemical and power polygeneration system for refractory iron ore magnetization roasting, the system simultaneously completes the comprehensive utilization of coal resources and iron ore resources, improves the efficiency of the entire system, and realizes the integration of resources-energy-environment benefit.

Description

technical field [0001] The patent of the present invention relates to the technical field of energy, chemical industry and metallurgy, in particular to a polygeneration system and method for magnetically roasting refractory iron ores such as limonite, siderite, and hematite. Background technique [0002] Ferrous metal ore beneficiation test and research work is an important part of the development of my country's mines and iron and steel industry, and it is also very important for the rapid development of my country's iron and steel industry. From the perspective of my country's ferrous metal ore resources, with the increase in the amount of ore mining, the proportion of weakly magnetic iron ore and multiferrous mineral iron ore that is difficult to select is increasing, and the grade of the selected ore is gradually declining. It's also getting more complicated. However, with the development of the iron and steel industry, the technical level of ferrous metal ore beneficiat...

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Problems solved by technology

The above three furnace types are used for magnetized roasting of iron oxide ore. Due to the large particle size of the ore feed, slow heat and mass transfer, and uneven roasting, the roasting time is long, the energy consumption is high, and the roasting cost is high.

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