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Click to add WeChatWith the continuous mining of iron, high-grade, easy-to-select ores are increasingly depleted, and more and more attention is paid to low-grade, high-impurity-containing, difficult-to-select and smelt iron ore resources. A certain limonite contains excessive phosphorus, making it very difficult to select. Large, its main purpose of beneficiation is to remove phosphorus to obtain high-grade limonite concentrate. In order to obtain high-grade limonite concentrate, a suitable process plan is very important. Therefore, through experimental analysis, a suitable process plan was selected for this limonite. Let’s find out together below!
The ore is buried close to the surface and is severely weathered and crushed. The ore sample is fluffy and powdery with high moisture content. And easy to deliquesce. The iron minerals in the ore are mainly hematite, followed by magnetite, iron silicate, iron carbonate and pyrite; the gangue minerals are mainly hornblende, dolomite, calcite and pyroxene, followed by Ordinary pyroxene and diopside, with a small amount of olivine, sericite, chlorite, tourmaline, quartz, etc.
Except for iron, there are no other valuable elements that can be comprehensively recovered; iron is almost entirely in the form of hematite; iron grade It is close to the theoretical grade of limonite, and the content of harmful impurity phosphorus exceeds the standard, so phosphorus removal is required. Therefore, grinding, magnetic separation, gravity separation, flotation and roasting-leaching experiments were conducted on the ore.
Grinding:Because the ore sample is powdery, similar to clay minerals, in order to prevent the ore from grinding The process produces over-grinding mud phenomenon. First, the -0.074mm particle size, which accounts for 70% of the raw ore, is separated as ore sample 2, and then the +0.074mm particle size, which accounts for 30% of the original ore, is ground to -0.074mm as ore sample 1. . The test results show that the iron grade of ore sample 1 is 55.26% and the phosphorus content is 0.412%, and the iron grade of ore sample 2 is 54.17% and the phosphorus content is 0.642%. Finally, according to the needs, the two mineral samples will be selected separately or mixed in proportion to form raw ore for selection.
Magnetic separation: Mix the ground ore sample 1 and ore sample 2 in a ratio of 3:7 to form raw ore as a strong magnetic separation test feed. The magnetic separation equipment adopts high gradient magnetic separator, and the magnetic medium is steel mesh. Through strong magnetic 1 coarse 1 sweep separation, the iron grade in the tailings is still relatively high, and the iron recovery rate is low; more importantly, there is no obvious difference in the phosphorus content between the concentrate and the tailings. This shows that it is impossible to increase iron and reduce phosphorus using strong magnetic separation technology.
Gravity separation: Gravity separation of ore samples 1 and 2 was carried out separately, and the equipment used a shaking table. The test results showed that the iron grade of the concentrate of ore sample 1 was relatively high, but the concentrate The total yield of ore 1 and concentrate 2 only accounts for 22.59% of the original ore, the phosphorus content of the concentrate still does not meet the standard, and the iron grade of the tailings is too high; ore sample 2 has no sorting effect. Therefore, the reselection plan is not feasible.
Flotation:The test is mainly to reduce phosphorus. Mineral sample 1 and mineral sample 2 are mixed into raw ore in a ratio of 3:7 as feed ore. There is no significant difference in iron grade and phosphorus content between the foam product and the product in the tank, indicating that the flotation method is still ineffective for the ore.
Roasting-leaching:Since conventional physical beneficiation methods such as strong magnetic separation, gravity separation and flotation have no separation effect on this ore, chemical methods are considered for treatment. Taking into account various factors such as the nature of the mineral sample itself, the test situation, cost, and benefits, it was decided to conduct a roasting-leaching test. The ground mineral samples 1 and 2 were mixed in proportion, and then dried, roasted, water quenched, and grinded. Leaching-drying operation, in which the role of water quenching is to prevent the ore from oxidizing in the air after roasting, and the role of grinding is to grind the agglomerates formed during roasting and water quenching. After 15 minutes of roasting, use inorganic acid A phosphorus removal leaching agent was developed with organic acids for leaching, and the ideal indicators of concentrate iron grade of 66.43%, phosphorus content of 0.131%, and iron recovery rate of 98.99% were obtained.
Through the above analysis of limonite containing phosphorus We conducted a variety of beneficiation tests and analyzes and finally chose the roasting-leaching beneficiation process. In the actual beneficiation plant, no matter what kind of ore, it cannot be generalized, nor can the experience of similar minerals be copied for beneficiation. It is very likely that The return on investment is low, so it is necessary to conduct mineral processing test analysis and customize a suitable process plan.
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