A microwave-fluidized roasting device for processing complex refractory iron ore

Abstract

The invention provides a microwave-fluidization roasting device for treating complex refractory iron ores. The microwave-fluidization roasting device comprises a reaction chamber and a microwave cavity arranged outside the reaction chamber, and a quartz net is arranged in the reaction chamber; a thermocouple is inserted from the top end of the reaction chamber, and a gap is formed between the bottom end and the quartz net; a protective gas inlet and a reducing gas inlet are formed in the bottom end of the reaction chamber, and an exhaust port is formed in the top end of the reaction chamber; and a microwave generation device is assembled outside the microwave cavity. According to the device, the efficient comprehensive utilization of the complicated and difficult-to-select weak magnetic iron ores can be realized, the advantages of fluidization roasting and microwave heating are concentrated, and the defects in existing applications are overcome.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a microwave-fluidized roasting device for processing complex refractory iron ore. Background technique [0002] With the rapid development of China's steel industry, the demand for iron ore has increased rapidly; according to the forecast of the World Iron and Steel Association, the global steel demand will exceed 3.2 billion tons between 2017 and 2018, of which China's steel demand will increase by 3%; in 2017, China imported 1.075 billion tons of iron ore, an increase of 7.5%, and its dependence on foreign countries exceeded 86%. Although China's total iron ore output is large, it generally presents the characteristics of "poor, fine, and miscellaneous", that is, iron ore is of low grade and useful. Mineral distribution is fine, ore composition is complex, and the proportion of refractory iron ore is relatively high; specifically, the overall mine iron gr...

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Problems solved by technology

[0002] With the rapid development of China's steel industry, the demand for iron ore has increased rapidly; according to the forecast of the World Iron and Steel Association, the global steel demand will exceed 3.2 billion tons between 2017 and 2018, of which China's steel demand will increase by 3%; in 2017, China imported 1.075 billion tons of iron ore, an increase of 7.5%, and its dependence on foreign countries exceeded 86%. Although China's total iron ore output is large, it generally presents the characteristics of "poor, fine, and miscellaneous", that is, iron ore is of low grade and useful. Mineral distribution is fine, ore composition is complex, and the proportion of refractory iron ore is relatively high; specifically, the overall mine iron grade is only 25-40%, and only 1.6% of mines are high-grade, and the average grade is only 34.29%, which is 10.45% lower than the global average grade. A large number of poor, impurity and weak magnetic iron ore resources have not been effectively developed and utilized; Shaped hematite is a typical iron ore resource that is difficult to use, with a total reserve of more than 20 billion tons, and is widely distributed in Liaoning, Hebei, Shanxi, Shaanxi, Hubei, Xinjiang, Guangxi and other provinces; Conventional mineral processing technology is difficult to obtain better technical and economic indicators, some resources have not yet been developed and utilized industrially, and although some resources have been developed, the utilization efficiency is extremely low; Comprehensive development and utilization is of great significance to reduce China's iron ore dependence on foreign countries and promote the healthy development of China's iron and steel industry

[0003] In recent years, around the high-efficiency development and utilization of complex refractory iron ores, many research institutes at home and abroad have carried out a lot of basic research and technological development work, among which the combination of dressing and metallurgy, that is, magnetization roasting-magnetic separation process, has the most outstanding effect, and magnetization roasting-magnetic separation process has the most outstanding effect. Magnetic separation refers to transforming weak magnetic iron minerals such as hematite, siderite, limonite, etc. into strong magnetic magnetite or maghemite through chemical reaction, and then using the magnetic difference between minerals for magnetic separation ;Magnetization roasting methods include shaft furnace roasting, rotary kiln roasting, fluidized roasting, etc.; the shaft furnace magnetization roasting process is mainly suitable for processing lump ore with a particle size of 25-75mm, and this process has the disadvantages of low single-machine processing capacity, high energy consumption, and roasting Problems such as long time and uneven product quality; the magnetization roasting process of the rotary kiln is suitable for processing ores with a particle size below 25mm. problems such as instability, low operating rate and high energy consumption; fluidization refers to the fluid state of solid material particles under the action of a fluid medium, and the fluidization process has characteristics similar to liquid; in recent years, some domestic research teams have focused on fluid state A lot of research has been carried out on chemical roasting technology and equipment. For example, the research team of Academician Yu Yongfu of Wuhan University of Technology proposed a circulating fluidized flash magnetization roasting process, and the Institute of Process Engineering, Chinese Academy of Sciences proposed a low-temperature fluidized magnetization roasting process. Good separation indicators; Among them, the pre-enrichment suspension roasting magnetic separation technology independently developed by Northeastern University is used for Wufeng-shaped hematite in Hubei, typical sedimentary hematite in eastern Chongqing, tailings in eastern Anshan Iron and Steel, and iron ore in eastern Anshan and JISCO powder ore as raw materials, carried out systematic PSRM laboratory and pilot test, all obtained good separation indicators

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