In recent years, a large number of mineral processing technology research and research, our complex refractory iron ore beneficiation technology has made significant progress, carry out Oolitic, hematite, limonite and Refractory Refractory siderite iron ore, etc. Research is getting deeper.
The braided hematite has been considered as a worldwide mineral processing problem due to its fine grain size, complex structure and composition. Bai Limei et al. conducted a reduction roasting-weak magnetic separation test on the braided hematite ore in Zhangjiakou area. The results show that under the conditions of calcination temperature 850 ° C, calcination time 75-90 min, coal-to-coal ratio 1:1, grinding fineness 80%-0.074 mm, magnetic field strength 80 kA/m, 1 rough selection And one selection, the fine grade of iron grade 63.06%, iron recovery rate of 86.05%.
Yong-Shengdeng Experiments on the depth-reducing treatment on a Refractory Oolitic ore, the ore is present in the form of iron oxide into metallic iron directly, using magnetic separation and then recovered. The results show that under the conditions of raw material particle size of -2mm, reduction temperature of 1350 ° C, reduction time of 50 min, iron ore and coal ratio of 3:2, the reduction material with a metallization rate of about 97% can be obtained. The iron grade of the post-concentrate is over 85%, and the recovery rate of iron can reach over 92%.
Shi Guangquan et al. studied the variation characteristics of iron minerals with reduction time during the deep reduction of a braided hematite, and discussed the growth process of metallic iron particles. The results show that in the deep reduction process of the 鲕-like hematite, the iron oxide is directly reduced to metallic iron according to the order of Fe 2 O 3 , Fe 3 0 4 , Fe0, Fe; with the continuation of the reduction time The metal iron particles gradually grow up in such a manner that small particles aggregate toward large particles.
Yang Dawei et al. carried out anti-flotation, strong magnetic separation, strong magnetic separation-reverse flotation, and also roasting-weak magnetic separation for a certain type of high- phosphorus -like hematite in western Hubei. Experimental Research. The results show that it is difficult to effectively sort the ore by using the conventional beneficiation method, and the reduction roasting using the dephosphorization agent in the roasting process - two-stage grinding and two weak magnetic separation processes can be used. The research results have provided a new idea for the development and utilization of high-phosphorus-like hematite ore by significantly increasing the iron grade while reducing the phosphorus content of iron concentrate to less than 0.1%.
For China's huge reserves of low-grade iron ore, the combination of multiple mineral processing methods has gradually become an inevitable trend. Yu Kexu and other high-silicon, low-sulfur and low-phosphorus acid-poor ore are treated by continuous grinding, coarse subdivision, re-election-magnetic separation-middle-mine regrind process, with a crude iron grade of 25.76%. Under the condition of a grinding fineness of 68.83%-0.074mm, an ideal beneficiation index was obtained.
He Deqing et al conducted a mineral processing test on the poor hematite ore in Sijiaying, Jixian County. The results show that the stage concentrate grinding, weak magnetic separation-strong magnetic separation-anion reverse flotation process can finally obtain iron concentrate with yield of 22.97%, iron grade of 65.80% and iron recovery rate of 69.10%. The grade is only 8.81%.
Ai Guanghua et al. conducted a beneficiation test on a refractory high-phosphorus red limonite ore. The results show that the iron concentrate with 62.32% iron content, 0.198% phosphorus content and 66.84% iron recovery rate can be obtained by reduction roasting-magnetic separation-leaching process. In view of the fact that a certain oxidized brownish-poor and hematite ore grade in Xinjiang has a low grade and a fine grain size, Xie Jianhong et al. conducted a systematic magnetization roasting-magnetic separation test. The results show that the ore can be magnetized and calcined under suitable process conditions, and the iron concentrate with 58.25% iron grade and 66.00% iron recovery can be obtained by magnetic separation.
In view of the low iron grade of a difficult karst iron ore in Yunnan, the complexity of mineral embedding, the serious muddy phenomenon and the high content of harmful elements, Bai Shaojun used strong magnetic separation-reverse flotation-magnetization reduction roasting-weak magnetic separation The joint research and smelting process was carried out experimentally. The results show that the iron grade is 69.87%, the iron recovery rate is 55.27%, the phosphorus content is 0.39%, the sulfur content is 0.2%, and the iron concentrate containing 6.38% is silicon.
Huo Jie et al. conducted a systematic experimental study on a braided limonite ore with an iron grade of 40.15% in Hainan using a wind-selection pre-selection-baking-magnetic separation process. The results show that an iron concentrate with an iron grade of 56.55% and an iron recovery of 84.50% can be obtained. This treatment process avoids the serious muddy phenomenon generated during the limonite beneficiation to a certain extent, and realizes water saving and energy saving.
Liu silver using self-developed magnetic roasting pilot unit, the iron grade of 21.21% Daxigou iron ore iron ore fines calcined chabazite - magnetic exploratory experiment, obtained yield 38% to 40% Iron concentrate with iron grade greater than 56% and iron recovery greater than 80%.
In the rocky ore of Wangjiatan, Feng Zhili et al. systematically studied the effects of magnetization roasting temperature and roasting atmosphere on the sorting index. The results show that under the condition of weak reducing atmosphere, 800～1060°C , the iron recovery rate is greater than 90%, the iron concentrate grade is greater than 58% of the separation index; at 1000 ° C conditions, whether in the weak reduction atmosphere, or in a weak oxidizing atmosphere, the iron recovery rate can be greater than 90% of good sorting indicators.
In view of the complex composition of iron minerals in Jilin Linjiang Antelope iron ore, the gangue minerals are easily muddy, and Gao Wenyi used the roasting-magnetic separation process for experimental research. The results show that under the condition of grinding fineness 95%-0.074mm, calcination temperature 800°C, roasting time 25min, reducing agent dosage 25%, magnetic field strength 107.43 kA/m, iron concentrate grade 60.83% can be obtained, iron recovery Rate 64.10% of the sorting technical indicators.
Zhang Zeye et al. conducted a mineral processing test on an iron ore associated with copper and sulfur minerals in Henan. The results show that the use of copper, sulfur sequential flotation, flotation tailings using weak magnetic separation to recover iron process, can comprehensively recover valuable elements in the ore; obtained iron concentrate grade 65.10%, iron recovery rate of 57.23%, The contents of copper and sulfur are 0.03% and 0.25%, respectively; the grade of sulfur concentrate is 42.00%, the recovery of sulfur is 95.62%, the grade of copper concentrate is 19.20%, and the recovery of copper is 52.79%. The results of this study have implications for the comprehensive recycling of polymetallic complex iron ore.
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