Fine purification technology of graphite

Abstract

The invention relates to a fine purification technology of graphite. The technology is characterized by comprising the following steps: firstly, evenly mixing graphite ore with sodium chloride and sodium carbonate according to a mass ratio of (80-90) to (5-10) to (5-10), then heating according to a heating rate of 10-15 DEG C / min, and roasting for 60-120min under the condition that the roasting temperature is 680-800 DEG C; after roasting is finished, obtaining a roasted clinker sample and waste gas; spraying the waste gas with clean water through a spraying pipeline to obtain spray liquid for subsequent acid leaching operation; carrying out washing operation on the roasted clinker sample, and carrying out solid-liquid separation to obtain washing liquid and a washed material after washing is finished; replenishing water immersion liquid with hydrochloric acid, and then mixing the obtained liquid with the spray liquid for subsequent acid dipping operation; carrying out the acid dipping operation on the washed material, stirring for 240-300min under the conditions that the concentration of the hydrochloric acid is 1-5mol / L, the liquid-solid ratio is (5-10mL) to 1g, the leaching temperature is 50-90 DEG C and the stirring intensity is 150-300r / min; after stirring is finished, carrying solid-liquid separation to obtain high-purity graphite. The fine purification technology of the graphite has the characteristics that the technology is simple in operation process, low in energy consumption, less in reagent consumption and low in calcination temperature, the waste water and the waste gas which are produced in a production process can be recycled, and the graphite product is high in purity.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of graphite, and in particular relates to a fine purification process of graphite. Background technique [0002] Graphite is a kind of resource mineral, and its products are often processed into performance materials such as electrical conductivity, sealing, fire resistance, high temperature resistance, heat dissipation, radiation protection and heat insulation, and are widely used in metallurgy, chemical industry and mechanical equipment and other fields. In recent years, with the rise of new energy and new material industries, the field of graphite deep processing has made great progress. However, the deep processing of graphite has strict requirements on the purity of graphite. The higher the purity of graphite, the greater its use value and commercial value. Therefore, the fine purification of graphite is very meaningful. [0003] At present, the graphite purification proces...

AI Technical Summary

Problems solved by technology

After graphite is roasted, elements such as nitrogen and hydrogen can be burned out, but it is difficult to destroy the structure of graphite containing elements such as aluminum and silicon. Therefore, when using alkali leaching and acid leaching processes, high-concentration chemicals are required to obtain high-purity graphite. Products; flotation operation is better for processing grade primary ore. When the graphite grade is greater than 90%, it is difficult to further improve the grade by using flotation operation. Six-stage flotation is required to increase the grade to 95%; alkali roasting - The acid leaching process can be used for high-purity graphite products, but the sticking phenomenon is prone to occur during the roasting process, which makes the roasting process difficult to operate and unfavorable for production; the hydrofluoric acid leaching process is difficult to control, and hydrofluoric acid is volatile and highly toxic; chlorine The chemical roasting method needs to feed chlorine gas, the process is difficult to control, and the remaining chlorine gas cannot be recovered; the high-temperature roasting method requires a temperature exceeding 2000 o C, high energy consumption and difficult operation

[0004] Therefore, the current graphite fine purification process has defects such as difficult operation, high energy consumption, large consumption of acid and alkali agents, high roasting temperature, inability to comprehensively utilize waste water and waste gas generated in the process, and low purity of graphite products.

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