阅读说明：本技术 球形石墨晶体的加工方法 (Method for processing spherical graphite crystal ) 是由 彭姣 于 2018-08-10 设计创作，主要内容包括：本发明球形石墨晶体的加工方法属于石墨加工技术领域,球形石墨是以高碳天然鳞片石墨为原料,加工方法包括整形、提纯等处理步骤,石墨颗粒球形度越好,电性能就越好。现有技术通常采用多级整形的方法来加工球形石墨,这种方法虽然在一定程度上改善了粉碎机效率不高的缺陷。球形石墨晶体的加工方法,通过选材处理、整形、提纯、干燥四个步骤加工出的球形石墨比表面积得到显著降低,振实密度得到提高。(The invention relates to a processing method of spherical graphite crystals, which belongs to the technical field of graphite processing, wherein the spherical graphite is prepared from high-carbon natural crystalline flake graphite serving as a raw material, the processing method comprises the steps of shaping, purifying and the like, and the better the sphericity of graphite particles is, the better the electrical property is. The prior art usually adopts a multi-stage shaping method to process the spherical graphite, and the method improves the defect of low efficiency of the pulverizer to a certain extent. The processing method of the spherical graphite crystal obviously reduces the specific surface area of the spherical graphite processed by four steps of material selection treatment, shaping, purification and drying, and improves the tap density.)

1. The processing method of the spherical graphite crystal is characterized by comprising the following steps:

a, selecting materials, namely repeatedly rolling by using a rolling machine by taking crystalline flake graphite as a raw material, and then sorting by a powder concentrator to obtain graphite crystals;

b, shaping, namely putting the graphite crystal into a kneading machine, adjusting the rotating speed to 1200 and 1500r/min and the pressure to 3-4Mpa/cm²Repeatedly kneading for 2-3 times to obtain spherical graphite crystals of 16-22 μm;

c, purifying, namely repeatedly washing the initial product of the spherical graphite crystal with water to obtain a relatively pure spherical graphite crystal;

d, drying, namely putting the spherical graphite crystal into a dryer for drying, adjusting the temperature inside the dryer to be 100-150 ℃, and continuously heating for 2-3h to obtain the spherical graphite crystal.

Technical Field

The invention relates to a processing method of spherical graphite crystals, belonging to the technical field of graphite processing.

Background

The spherical graphite is a graphite product which is produced by modifying the surface of graphite by adopting an advanced processing technology and has different fineness and is shaped like an ellipsoid. The spherical graphite material has the characteristics of good conductivity, high crystallinity, low cost, high theoretical lithium intercalation capacity, low charge-discharge potential, flatness and the like, and is an important part of the current lithium ion battery cathode material. The spherical graphite is prepared from high-carbon natural crystalline flake graphite as a raw material, the processing method comprises the processing steps of shaping, purification and the like, and the better the sphericity of graphite particles is, the better the electrical property is. The prior art usually adopts a multi-stage shaping method to process the spherical graphite, and the method improves the defect of low efficiency of the pulverizer to a certain extent. However, the conventional purification treatment step is usually to treat the spheroidal graphite with an acidic aqueous solution alone, resulting in lower purity of the spheroidal graphite produced.

Disclosure of Invention

According to the processing method of the spherical graphite crystal, the specific surface area of the spherical graphite processed by four steps of material selection treatment, shaping, purification and drying is obviously reduced, and the tap density is improved.

The processing method of the spherical graphite crystal is characterized by comprising the following steps:

a, selecting materials, namely repeatedly rolling by using a rolling machine by taking crystalline flake graphite as a raw material, and then sorting by a powder concentrator to obtain graphite crystals;

b, shaping, namely putting the graphite crystal into a kneading machine, adjusting the rotating speed to 1200 and 1500r/min and the pressure to 3-4Mpa/cm²Repeatedly kneading for 2-3 times to obtain spherical graphite crystals of 16-22 μm;

c, purifying, namely repeatedly washing the initial product of the spherical graphite crystal with water to obtain a relatively pure spherical graphite crystal;

d, drying, namely putting the spherical graphite crystal into a dryer for drying, adjusting the temperature inside the dryer to be 100-150 ℃, and continuously heating for 2-3h to obtain the spherical graphite crystal.

Detailed Description

The embodiments of the present invention will now be described in detail with reference to the foregoing.