A kind of high-purity graphite purification process
A graphite and process technology, applied in the field of high-purity graphite purification process, can solve the problems of difficult removal of impurities, low graphite purity, high equipment requirements, etc., and achieve the effect of improving purity
Active Publication Date: 2021-03-02
青岛洛唯新材料有限公司
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Problems solved by technology
Among them, the high-temperature method can increase the purity of graphite powder to 99.99%, but it requires high equipment, and the working temperature must be at least above 3000°C, which greatly increases the cost, and it is difficult to remove high-boiling impurities such as B4C, VC, and TiO2 , resulting in impurities in the purified graphite, resulting in low purity of graphite
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[0042] A kind of high-purity graphite purification process, see figure 1 and figure 2 , the steps are as follows:
[0043] S1. Primary batching: batch graphite, acid solution and water in a ratio of 4:3:6.
[0044] 1. Weigh a certain amount of graphite: Weigh a certain graphite value through the graphite weighing tank 14, and transport it to the primary batching tank 11 through the screw feeder 13.
[0045] 2. Primary ratio of acidic solution: Mix the volume of HF, HCL and HNO3 according to the ratio of 5:3:2, that is, add the ratio of HF: HCL: HNO3=5:3:2 to primary acid batching tank 1 , since the silicate contained in the graphite is mainly dissolved by hydrofluoric acid, the proportion of HF is relatively large in a proportioning ratio; the total mass of HF, HCL and HNO3 and the total mass of graphite are 3:4, and then the HF, HCL and HNO3 are stirred, and the stirring time is about 1~2h, and they are passed into the primary batching tank 11 after stirring evenly.
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The invention discloses a graphite acidification purification process, which belongs to the technical field of graphite purification, and comprises the following steps: S1, primary batching: adding graphite, acidic solution and water into a primary batching tank at a ratio of 4:3:6 and stirring Uniform; S2, primary reaction: heat and stir the acidic solution, water and graphite added to the primary reaction tank, so that the impurities in the graphite can fully react with the acidic solution; S3, the primary filter press separates the graphite from the liquid; S4, the secondary Secondary batching: transport the graphite separated from the primary filter press to the secondary batching tank, so that graphite, acidic solution and water are passed into the secondary batching tank in a ratio of 5:3:5; S5, secondary reaction: Pass the uniformly mixed graphite, acid solution and water into the secondary reaction tank for heating and stirring; S6, the secondary filter press separates the graphite from the liquid; S7, washes with water; S8, the centrifuge separates water and graphite; S9 , drying; the present invention has the effect of removing impurities in the graphite and improving the purity of the purified graphite.
Description
technical field [0001] The invention relates to the technical field of graphite purification, in particular to a high-purity graphite purification process. Background technique [0002] Graphite has many advantages such as low density, corrosion resistance, radiation resistance, self-lubrication, high and low temperature resistance, etc. It has important applications in aerospace, aviation, military industry, electronics, nuclear energy, metallurgy and other fields. With the continuous development of new technologies and new processes, ordinary high-purity graphite materials can no longer meet the needs of many industries. The quality of graphite purification determines the use characteristics and comprehensive performance of graphite materials. The higher the purity of graphite, the higher the application value . [0003] At present, there are mainly chemical methods for graphite purification at home and abroad, including flotation, alkali-acid method, hydrofluoric acid me...
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IPC IPC(8): C01B32/215
CPCC01B32/215
Inventor 刘军德李焱雄李清泉
Owner 青岛洛唯新材料有限公司