A technology for reusing iron ore shaft furnace roasting magnetic separation flotation tailings
A technology for flotation of tailings and iron ore, which is applied in the field of mineral processing, can solve the problems of high grade of magnetic separation tailings, uneven quality of roasted ore, high cost of secondary recovery and utilization, and achieves low metal recovery rate and increased resources. Utilization, cost reduction effect
Active Publication Date: 2019-01-25
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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Problems solved by technology
[0004] The present invention aims at the problem of magnetization roasting in a shaft furnace of refractory iron ore in a certain size range, uneven roasted ore quality, high grade magnetic separation tailings, which can be recycled but sent to tailings dams, and the cost of secondary recycling is high, and provides A recycling process of iron ore shaft furnace roasting magnetic separation flotation tailings
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[0019] Example: The refractory iron ore comes from the Jingtieshan Mine in Jiugang.
[0020] The +15mm~-100mm Jingtieshan oxidized refractory iron ore with a grade of 32% in Jiuquan Iron and Steel Co., Ltd. will be treated as follows:
[0021] A. Sieve to +15mm~-100mm and send it to the shaft furnace for magnetization roasting, and the roasted ore is cooled to 57°C;
[0022] B. Use magnetic pulleys to perform dry pre-selection and discarding of roasted ore, and the discarding grade is below 8%;
[0023] C. The pre-selected concentrate after discarding is subjected to three-stage weak magnetic wet grinding and reverse flotation, and it is ground to -0.074mm, accounting for about 80%. After reverse flotation, the concentrate is the final qualified concentrate, with a grade of more than 60% ;
[0024] D. The grade of tailings in the first stage of weak magnetic concentration is below 8%, and it is discharged as qualified tailings; the grade of tailings in the second stage, thi...
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The invention relates to an iron ore shaft-furnace roasting and magnetic separation and flotation tailings recycling process. The iron ore shaft-furnace roasting and magnetic separation and flotation tailings recycling process mainly comprises the following technological steps that oxidized refractory iron ore with the grain size ranging from 15 mm to -100 mm is subjected to magnetic roasting through a shaft furnace, roasted ore is cooled to be below 57 DEG C and subjected to dry pre-concentration and waste discharging through a magnetic pulley, and after waste discharging, the roasted ore is wet-ground till ore with the grain size of -0.074 mm accounts for about 80%; three-section wet concentration through a weak magnetic separator and reverse flotation are conducted; tailings obtained through the second-section concentration, third-section concentration and reverse flotation are gathered through the magnetic separator, the gathered tailings, tailings obtained through the first-section concentration and first waste stone obtained after waste discharging are discharged as qualified tailings at the same time, and the grade is controlled to be 9% or below; and gathered concentrate is filter-dewatered, scattered and pelletized and then returns to a rotary kiln for closed-circuit magnetic roasting, concentrate obtained after reverse flotation is the final qualified concentrate, and the grade is 60% or over. By means of the process, online closed-circuit recycling of iron resources in the tailings is achieved, and the problem of high cost of secondary recycling and re-concentration caused by the fact that the tailings are delivered into a tailing reservoir is solved.
Description
technical field [0001] The invention belongs to the technical field of mineral processing, and relates to a process for reusing iron ore shaft furnace roasting magnetic separation flotation tailings. Background technique [0002] my country's iron ore resources are rich in lean ore and less in magnetic ore, and weakly magnetic iron ore accounts for more than 70% of the total reserves. Only after the weakly magnetic iron ore is magnetized and roasted and turned into a strong magnetic mineral can it be magnetically separated, Reverse flotation to obtain iron concentrates whose quality meets the requirements for sintering ingredients. The iron ore with a grain size of +15mm is directly magnetized and roasted in a shaft furnace, and the iron ore with a grain size of -15mm is classified and then put into a rotary kiln for magnetization roasting. Since different grain sizes of refractory iron oxide ore have different magnetization roasting characteristics, roasting time, roasting ...
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IPC IPC(8): C22B1/02C22B1/00B03B9/06
CPCB03B9/06C22B1/00C22B1/02Y02P10/20Y02W30/52
Inventor 边立国展仁礼王欣郭忆雷鹏飞杏仲全
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD