Fine flaky-cryptocrystalline mixed graphite separation technique

Abstract

The invention discloses a fine flaky-cryptocrystalline mixed graphite separation technique which comprises the following steps: primary rough grinding and rough separation, quintic regrinding and sextic concentrating, and middling centralized processing. According to the technique, in the rough separation step, the grinding fineness is -0.074mm, and the content is 90-95%; in the concentrating step, the regrinding fineness is -0.045mm, and the content is 90-95%; and thus, the graphite monomer is sufficiently dissociated, thereby sufficiently ensuring the fixed carbon content and recovery rate of the concentrated concentrate. The technique adopts gradually decreased low concentrating concentrations in multiple concentrating process to ensure the dispersity of ore slurry, thereby solving the severe problem of entrapped impurities in floatation foam; and thus, in the final concentrate, the fixed carbon content is 91.35%, and the recovery rate is 91.30%, thereby solving the problems of low technical indexes, low grade, low recovery rate and high cost in the fine flaky-cryptocrystalline mixed graphite concentrate separation, so that the fine flaky-cryptocrystalline mixed graphite ores are utilized in an efficient, economical and reasonable way.

Description

technical field [0001] The invention relates to a graphite beneficiation process, in particular to a fine scale-aphaphatic mixed type graphite beneficiation process. Background technique [0002] Graphite resources are the dominant resource minerals in my country. my country is rich in graphite resources, and its reserves, production and sales rank first in the world. Graphite ore can be divided into crystalline graphite ore and aphanitic graphite ore according to different crystal forms, and crystalline graphite ore is further divided into dense crystalline graphite ore and flake graphite ore. Graphite ore mainly exists in the form of flake graphite in nature. Flake graphite has large scales, good crystallinity, and good natural buoyancy, so it can be better utilized by conventional flotation beneficiation process. The general beneficiation process can obtain graphite concentrate with a fixed carbon content of ≥90%. , a product with a recovery rate ≥ 90%; this product can...

AI Technical Summary

Problems solved by technology

Due to the fine particle size and high clay mineral content of the ore, when the conventional flotation process is used, the flotation sludge will be serious, the flotation reagents are complicated, the flotation foam viscosity is high, the foam entrains impurities seriously, and the flotation time is long. The process is complicated, and the middle ore is difficult to deal with, which ultimately leads to the low fixed carbon content and recovery rate of the concentrate. Generally, the fixed carbon content is 80%-88%, and the recovery rate is only 72%-88%, so it cannot be sufficient, reasonable and economical. Make the best use of the graphite ore resources

[0004] At present, many mineral processing plants use the conventional flotation process to recover this type of graphite, but due to the low mineral processing index and high mineral processing cost, the company is facing severe losses.

[0005] The document "Study on the Flotation Process of Fine Flake Low Carbon Graphite" discloses the process of successively conducting roughing condition test and fine selection condition test on fine flake low carbon graphite, and it is determined that the coarse grinding fineness is -0.074mm and the content is 89.12% , selection and regrinding fineness -0.045mm content 67.28%, because the fineness and content of ore grinding are related to the degree of full dissociation of graphite monomer, which in turn determines the content and recovery rate of fixed carbon in flotation concentrate, the above Although the grinding fineness disclosed in the literature has reached -0.074mm and -0.045mm respectively, but the content is too low, which will eventually lead to too low content of fixed carbon in the final concentrate and low recovery rate; Graphite raw ore is fine flake low-carbon graphite. There is no aphanitic graphite and clay-like gangue minerals with poor floatability in this type of ore. Fixed carbon can be obtained by traditional five times of grinding and six times of beneficiation. Graphite concentrate with higher content

[0006] The document "Experimental Research on Mineral Processing of Aphanitic Refractory Graphite in Guangyuan Area" discloses the beneficiation process of aphanitic graphite, but the key factor that determines the fixed carbon content and recovery rate of aphanitic graphite flotation concentrate is "multiple grinding The fineness and content and the flotation concentration and the law of flotation concentration during multiple beneficiation" are not given in the above-mentioned documents, resulting in a final concentrate grade of only 83.80%, resulting in a large degree of waste, Therefore, how to maximize the use of fine scale-aphanitic graphite ore resources and improve the fixed carbon content of graphite concentrate is an important problem to be solved urgently.

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