Fluorite is an important non-renewable resource, widely used in metallurgy, chemical industry, building materials, optics and other fields. With the continuous expansion of fluorite application fields in recent years, more and more attention has been paid to the development and utilization of fluorite. The development and utilization of multi-vein fluorite mines are also increasing.
Complex multi-vein type fluorite ore includes quartz-type fluorite, calcite-type fluorite, barite-type fluorite and sulfide ore-type fluorite. The beneficiation method is generally based on flotation. This article will introduce these complex multi-vein type fluorite. The beneficiation process of quarry.
Quartz-type fluorite is mainly composed of fluorite and quartz. The content of fluorite is about 85%, and it also contains a small amount of calcite, barite and sulfide.
Reducing silicon in concentrates is the focus of this type of ores, and the requirements for silicon content vary according to different usage requirements. In the process of beneficiation, grinding is a factor that greatly affects the flotation of quartz-type fluorite ore, and it is necessary to dissociate the quartz and fluorite monomers through grinding.
Since most quartz-type fluorite ores have conjoined bodies of quartz and fluorite, the grinding particle size is too fine, which will lead to over-grinding of fluorite and affect the recovery rate. Therefore, a stage grinding process is generally adopted, which not only reduces the concentration of fluorite after flotation The silicon content of the product can also increase the recovery rate of fluorite concentrate. Using the process flow of stage grinding and flotation, high-grade fluorite concentrate can be obtained after multiple selections.
02 Calcite-type fluorite beneficiation
Calcite-type fluorite mainly includes fluorite and calcite, the content of calcite is generally higher than 30%, and the ore contains a small amount of quartz, which may form quartz-calcite-fluorite type ore. Since calcite and fluorite are both calcium-containing minerals and have similar physical and chemical properties, it is difficult to separate them by flotation in pulp.
The pH of the pulp will have a greater impact on the flotation index. In the selection of flotation reagents, fatty acid collectors can float calcite and fluorite together. It is necessary to adjust the pH of the pulp to adjust the difference in flotation between the two. Generally, In the range of pH 8~9.5, both calcite and fluorite can float, but in weakly acidic medium, the floatability of calcite is lower than that of fluorite. In actual production, tests should be carried out to determine the appropriate Pharmacy regime and flotation conditions.
03 Barite type fluorite beneficiation
Barite-type fluorite ore mainly contains barite and fluorite, of which the content of barite is generally between 10% and 40%, and also contains pyrite, galena, sphalerite and other sulfide minerals. Barite has similar floatability to fluorite, making separation of the two minerals difficult.
In the process of beneficiation, the mixed flotation process is generally used to adjust the pH value of the pulp with sodium carbonate, and use oleic acid and water glass as collectors and inhibitors, respectively, to obtain a mixed concentrate of barite and fluorite. , In the way of flotation, inhibiting barite or fluorite, flotation of another mineral.
04 Sulfide mineral type fluorite beneficiation
The mineral composition of sulfide ore-type fluorite is similar to that of quartz-type fluorite minerals. Compared with it, it has a higher content of metal sulfides, and the content of elements such as lead and zinc can even reach industrial grades. Therefore, this type of ore is being developed and utilized The comprehensive recycling of various elements needs to be considered in the process.
When classifying such ores, sulfide ore collectors are generally used to preferentially flotate metal sulfide minerals, and then fatty acid collectors are used to classify the flotation tailings to recover fluorite. In order to better extract valuable metals and decompose fluorite, processes such as roasting and leaching are also added to the sorting method to prepare high-quality fluorite products while recovering valuable metals.
The above are the sorting methods of four types of complex multi-vein type fluorite ores. Different fluorite ores have different components and properties, as well as different beneficiation methods. Therefore, Xiaobian suggests that a scientific and reasonable beneficiation process should be determined through beneficiation tests to avoid economic losses and resource waste to the beneficiation plant.
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