Process for purifying natural graphite by using alkali-acid method
A technology of natural graphite and craftsmanship, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of equipment not being large-scale
Inactive Publication Date: 2019-03-22
苏州中材非金属矿工业设计研究院有限公司
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Problems solved by technology
[0006] The material of the original solid-alkali calcination equipment will produce "alkali embrittlement" when the high temperature is increased in the presence of solid alkali. However, the cast iron pipe with anti-alkali embrittlement is selected as the rotary calciner body, and the maximum length of the cast iron pipe can only be 6~ 8m long, diameter Ø600~Ø1800mm, equipment cannot be enlarged
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[0054] Example: see attached Figure 1~4 Shown, a kind of technique of natural graphitic alkali acid method purification; Comprise the following steps:
[0055] Step 1. Pretreatment of raw materials
[0056] Natural graphite with a fixed carbon content of 92 to 97% or microcrystalline graphite with a fixed carbon content of 75 to 85% and a NaOH solution with a concentration of 20 to 50% are mixed and stirred evenly by a mixing and stirring device 10 to form a mixture;
[0057] Because the liquid alkali and graphite raw materials are fully pre-stirred, the surface of each graphite is fully "wetted" by the alkali solution, which can ensure a full reaction. Compared with the original method of solid alkali, it saves the amount of alkali, saves the reaction time, and then saves energy. consumption and lye consumption and ensure full reaction, improve product quality.
[0058] Step 2. Feeding
[0059] The mixed material is sent into the rotary heating cylinder 1 of an alkali mel...
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Abstract
The invention relates to a process for purifying natural graphite by using an alkali-acid method. The process comprises the following steps: 1. mixing natural graphite or microcrystalline graphite with a NaOH solution, and stirring to form a mixture; 2, feeding the mixture into a rotary heating cylinder of an alkali melting furnace by means of a feeding mechanism; 3, calcining the mixture by usingthe heating cylinder, wherein the heating cylinder comprises a nickel plate lining and a plurality of nickel plate lifting boards, the heating way of the calcination is direct heating or indirect heating, the temperature is maintained to be 300-500 DEG C, the time is 20-60min; during calcinations, enabling the heating cylinder to rotate along a longitudinal center line, and continuously raising the mixture by using all the nickel plate lifting boards so as to enable the mixture to be in a suspending state; maintaining the interior of the heating cylinder to be in a reducing atmosphere and under a micro-positive pressure, and discharging the waste gas, generated by the calcinations, through an exhaust hole; 4, discharging the calcined mixture by means of a discharge mechanism; 5, washing away water glass in the discharged material by using a waterlogging method, and removing impurity SiO2 so as to realize purification. The process provided by the invention avoids the problem of causticembrittlement caused by high-temperature calcinations method, is good in purification effect, and can realize facility upsizing.
Description
technical field [0001] The invention relates to the field of natural graphite processing in non-metallic ores, in particular to a process for purifying natural graphite by alkaline acid method. Background technique [0002] Graphite is one of the most important non-metallic mineral resources in the world and has a wide range of uses. Based on its excellent electrical conductivity, thermal conductivity, high temperature resistance, and rapid cooling and heat resistance, graphite has become an indispensable and important raw material for metal smelting, machinery manufacturing, electronics industry, aerospace and military industries, and it is also the most important material for graphene manufacturing. One of the important raw materials. [0003] In the grade of natural graphite ore, flake graphite contains about 2-20% (mostly 5%-10%), and microcrystalline graphite contains about 30-75% (very few are above 80-90%). Higher grade medium carbon graphite, high carbon graphite o...
Claims
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IPC IPC(8): C01B32/196
CPCC01B32/196C01B2204/30
Inventor 庞功周何保罗于阳辉程星顾顺奇郭爱锋王想
Owner 苏州中材非金属矿工业设计研究院有限公司