Beneficiation method for high-argillization fluorite ore with complex dissemination relation

Abstract

The invention relates to a beneficiation method for high-argillization fluorite ore with a complex dissemination relation. The beneficiation method comprises the following steps: (1) crushing high-argillization fluorite raw ore, and wet-grinding the crushed high-argillization fluorite raw ore until the high-argillization fluorite raw ore accounts for 60-75% of an ore grinding product with the fineness of-0.074 mm; (2) settling and grading the ore grinding product to respectively obtain a fine-grained product with the particle size of less than 0.01 mmd and a coarse-grained product with the particle size of more than 0.01 mm; (3) carrying out roughing and scavenging on the coarse fraction product after size mixing to respectively obtain fluorite rough concentrate, scavenged middling and tailings; returning scavenged middlings to roughing operation; (4) enabling the fluorite rough concentrate to be subjected to size mixing and then subjected to ore grinding, and obtaining reground rough concentrate with the fineness being 0.038 mm and accounting for 80%-90%; (5) carrying out primary concentration after the reground rough concentrate is subjected to size mixing, so as to respectively obtain primary concentration concentrate and primary concentration middling; returning middlings subjected to primary concentration to the sedimentation grading operation; and (6) carrying out four times of concentration after the primary concentration concentrate is subjected to size mixing to respectively obtain fluorite concentrate and each time of concentration middling, and returning each time of concentration middling to the previous time of concentration operation in sequence. The technological process is high in stability, the beneficiation index is excellent, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a beneficiation method for high-mud fluorite ore with complex embedding relations. Background technique [0002] At present, as the main raw material of fluorine chemical industry, fluorite is also widely used in metallurgy, ceramics and other industries. During the on-site closed-circuit production process of fluorite mines, there are often problems such as a large amount of slurry circulation when the middle ore returns, which leads to sticky slurry foam, unstable process flow and flotation indicators. For fluorspar resources that are closely embedded with gangue minerals and have severe mudification, if the fluorite is not finely ground, it is difficult to dissociate the fluorite as a monomer, but fine grinding will greatly increase the degree of muddyness of the minerals, and then aggravate The influence of medium ore return on flotation index and process stabilit...

AI Technical Summary

Problems solved by technology

During the on-site closed-circuit production of fluorite mines, there are often problems such as a large amount of slurry circulation when the middle ore returns, which leads to sticky slurry foam, unstable process flow and flotation indicators.

For fluorspar resources that are closely embedded with gangue minerals and have severe mudification, if the fluorite is not finely ground, it is difficult to dissociate the fluorite as a monomer, but fine grinding will greatly increase the degree of muddyness of the minerals, and then aggravate The influence of medium ore return on flotation index and process stability

[0003] During fluorite ore beneficiation, the normal return method of medium ore is sequential return or concentrated return. For ores with high slime content, with the return of medium ore in closed-circuit production, the content of ore slime in each beneficiation operation will gradually increase, and the fine ore will gradually increase. The separation efficiency gradually decreases, so for the fluorite ore with severe mudification, whether the middle ore is returned sequentially or in a concentrated manner is not good for the flotation effect

[0004] In order to overcome the adverse effects of returning middle ore on flotation, according to the properties and characteristics of different ores, some researchers have successively proposed the process of discarding part of middle ore or concentrated re-election: Fluorite ore adopts the technological process of one rough and eight refined, medium ore 1 is discarded, and medium ore 2~8 is returned to a process of regrinding before concentrating. Although the fluorite concentrate that meets the quality standard is finally obtained, due to the middle ore 1 was discarded, concentrate CaF 2 The recovery rate is low, only 65.46%. Mao Surong et al. used a process of roughing and seven times of beneficiation for a fluorite mine in Yunnan, and concentrated re-election of middle ore, and obtained CaF 2 The grade and recovery rate of fluorspar concentrate are 97.14% and 81.38%, respectively. Although the flotation index is relatively ideal, in actual production, considering the characteristics that the ore slime is difficult to settle, and the medium ore needs to be concentrated before re-election. It is difficult to recover this part of fluorite, and it may not be economically cost-effective.