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Grading and separating method for protecting crystalline graphite flakes

A crystalline graphite and quality separation technology, applied in the directions of graphite, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of insufficient application, and achieve the effect of increasing added value

Active Publication Date: 2018-02-27
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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Problems solved by technology

At present, it is mainly used in iron ore, cement and other industries. Due to various reasons, high-pressure roller mill crushing is still rarely used in the field of graphite separation.

Method used

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  • Grading and separating method for protecting crystalline graphite flakes

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Embodiment

[0031] Example: The raw ore used is crystalline graphite ore in the Alashan area of ​​Inner Mongolia. The fixed carbon content of the raw ore is about 4.7%. The gangue minerals mainly include quartz (mineral content 30%-35%) and mica (mineral content 15%-20%) , Feldspar (mineral content 25% to 35%), also contains a small amount of carbonate minerals, hornblende, chlorite and pyrite. Graphite crystals are in the form of flakes and scales, and there are also dense massive aggregates arranged in a directional arrangement. After closed-circuit crushing in a high-pressure roller mill, the sieve hole size is controlled to 1.5 mm. The results of particle size and fixed carbon content distribution are shown in Table 1.

[0032] It can be seen from the results in Table 1 that in the finely crushed products of the high pressure roller mill, the yield rate of +100 mesh size fraction is 54.90%, and the fixed carbon distribution rate is 59.43%.

[0033] Table 1 (1.5mm raw ore particle siz...

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Abstract

The invention provides a grading and separating method for protecting crystalline graphite flakes, and aims to solve the problem of high loss rate of the crystalline graphite flakes. The method comprises the following steps: (1) performing closed circuit grinding on raw ore with a high-pressure grinding roller; (2) grading and separating a ground product obtained in step (1) after 'primary rougherflotation, primary concentration and primary scavenging' flotation; (3) re-grinding and re-separating a coarse-grain low-carbon product to obtain medium-carbon graphite concentrate and middling, screening the medium-carbon graphite concentrate to obtain medium-carbon positive-mesh concentrate and medium-carbon negative-mesh concentrate I; re-grinding and re-separating a medium-grain high-carbon product to obtain high-carbon positive-mesh concentrate and middling; re-grinding and re-separating a fine-grain medium-carbon product to obtain medium-carbon negative-mesh concentrate I; grading the medium-carbon negative-mesh concentrate to obtain high-carbon negative-mech concentrate and medium-carbon negative mesh concentrate II. By adopting the method, differential separation of graphite is realized, and the added value of the graphite concentrate is increased.

Description

technical field [0001] The invention relates to a graphite sorting method, in particular to a crystalline graphite flake sorting method. Background technique [0002] Graphite is a non-metallic material with stable properties and a layered structure. According to the different crystal forms, it is divided into two types: cryptocrystalline graphite and crystalline graphite. Aphanitic graphite raw ore has high fixed carbon content, but its performance is poor and its industrial value is not high. Crystalline graphite is also called flake graphite. The scale size is generally (10~20mm)×(0.5~10 mm), and the thickness of the sheet is 0.02~0.05mm. It has excellent physical, chemical and mechanical properties, and has high utilization value. , and the larger the flakes (especially +100 mesh large flake graphite), the higher the fixed carbon content and the higher the value, it is widely used in metallurgy, chemical industry, machinery, electronics, medical treatment, nuclear indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/21C01B32/215
Inventor 刘磊冯安生郭珍旭牛敏马驰赵恒勤
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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