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采用细磨选择性脱泥成功地解决了包头铁矿物与含铁硅酸盐矿物的有效分离,其原因: 选择性磨矿:由于包头的铁矿物和硅酸盐矿物的硬度、解理、晶格构造的差异,细磨后,铁矿物在粗级别中富集,硅酸盐矿物在细级别中富集,产生选择性磨矿。由粒度分布曲线推导出选磨指数K=2(Q_1-Q_2)或K=β_1-β_2,其值愈大,选择性磨矿差异愈大。等量粒度点其K=O,实践证明:等量粒度的产率应控制最小。 选择性凝结:细磨后,pH=8～10是矿浆适宜分散pH值,NaOH调节pH,Na_2SiO_3是良好的分散剂。由于硅酸盐矿物表面具有更大的表面负电性,因静电斥力而分散,铁矿物在电解质作用下,压缩了铁矿物表面双电层,降低了排斥势能,受范德华力而凝结,即细颗粒铁矿物在电解质NaOH、Na_2SiO_3的作用下,产生选择性凝结。 对于经过电解质处理的、已具有凝固条件的铁矿物表面,在外力磁场及磁铁矿磁力作用下,磁铁矿能有效地捕捉比磁化系数较大的赤铁矿,因而加速了选择性凝结的进程,起到催化作用。 选择性脱泥:经选择性磨矿及选择性凝结后,铁矿物的颗粒尺寸相对于脉石矿物的粒度而变大。由于铁矿物的比重(δ铁>5)大于脉石矿物的比重(δ脉<3.6),这样,为重力选分创造一个良好条件。 在脱泥斗中,从上至下产生浓度梯度,由此介质的比重也产生梯度,颗粒变大的铁?
Selective demineralization with fine grinding has successfully solved the effective separation of Baotou iron ore from iron-bearing silicate minerals due to selective grinding: due to the hardness of the iron minerals and silicate minerals in the Baotou, cleavage , Differences in lattice structure, fine grinding, the iron ore enrichment in the coarse level, silicate mineral enrichment in the fine level, resulting in selective grinding. From the particle size distribution curve, the grinding index K = 2 (Q_1-Q_2) or K = β_1-β_2 is deduced. The larger the value is, the greater the difference is. The same amount of granularity point of its K = O, proved that: the equivalent size of the yield should be controlled to a minimum. Selective coagulation: Fine grinding, pH = 8 ~ 10 is suitable for the pH value of the slurry, NaOH pH, Na2SiO_3 is a good dispersant. Due to the larger surface electronegativity of silicate minerals, they are dispersed by electrostatic repulsion. Under the action of electrolyte, the iron minerals compress the electric double layer on the surface of iron minerals, reducing the repulsive potential energy and coagulating by Van der Waal’s force, that is, Fine-grained iron minerals produce selective coagulation under the action of electrolytes NaOH and Na 2 SiO 3. Magnetite can effectively capture hematite with a larger magnetization coefficient under the action of an external magnetic field and a magnetic force of magnetite on the surface of an iron mineral that has been subjected to an electrolyte treatment and has a solidification condition, thereby accelerating selective coagulation The process of playing a catalytic role. Selective desliming: After selective grinding and selective coagulation, the particle size of the iron mineral becomes larger relative to the size of the gangue minerals. As the specific gravity of iron minerals (δ iron> 5) is greater than that of gangue minerals (δ pulse <3.6), thus creating a good condition for gravity separation. In the de-silt bucket, a concentration gradient is generated from the top to the bottom, and the specific gravity of the medium also produces a gradient and a particle with a large iron content.