A method for flotation separation and recovery of graphite and silicon from waste graphite components in the silicon crystal production process
A graphite component and production process technology, applied in chemical instruments and methods, flotation, solid separation, etc., can solve problems such as pollution, large energy consumption, waste, etc., and achieve the effect of increasing economic value
Active Publication Date: 2018-09-18
CHINA UNIV OF MINING & TECH
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Problems solved by technology
The production process of high-purity graphite and silicon requires a lot of energy and also produces some pollution
If these wastes are not recycled, it will inevitably cause huge waste
Method used
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Embodiment 2
[0032] After the graphite components discarded in the silicon crystal production process are crushed, the particles with a particle size of -0.5mm are selected, and the silicon content is 40.21% (mass ratio), and the carbon content is 57.85% (mass ratio). The specific steps are as follows:
[0033] 1) Slurry: Pour the -0.5mm particles produced during the crushing process of graphite components into the slurry mixing tank, add water to control the solid content in the slurry to 8% (mass ratio), and continue to stir evenly at normal temperature and pressure;
[0034] 2) Inhibition and stirring: While stirring in the mixing tank, add inhibitor water glass 1.3kg / t, collector diesel oil 1.2kg / t, foaming agent 2# oil 0.5kg / t, and stir evenly Put the pulp into the flotation tank;
[0035] 3) Primary flotation: under the condition of natural pH value, the ore pulp is subjected to primary flotation to obtain primary flotation foam and underflow;
[0036] 4) Secondary rough flotation: ...
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The invention discloses a method for flotation separation and recovery of graphite and silicon from waste graphite modules in a silicon crystal production process. The method comprises the steps of pulp mixing, inhibition and stirring, primary rough flotation, secondary rough flotation, ore grinding and primary finish flotation, and specifically comprises the following process: particles generated in the graphite module crushing process are poured in a pulp mixing tank; water is added for continuous and uniform stirring under normal temperature and normal pressure; inhibitor water glass, collecting agent diesel and foaming agent 2# oil are added in sequence for uniform stirring; and then, pulp is put in a flotation tank. Under the condition of natural pH value, the primary rough flotation is performed for the pulp to keep the natural pH value of the pulp; water glass, diesel and 2# oil are added in sequence during stirring; the secondary rough flotation is performed for a base flow in the primary rough flotation; the base flow is a silicon product; foam products in the primary rough flotation and the secondary rough flotation are merged for ore grinding; and an ore grinding product is added in the water glass for the primary finish flotation to obtain the graphite. The method realizes high-efficiency separation and recovery of silicon and carbons.
Description
technical field [0001] The invention relates to a method for flotation separation and recovery of graphite and silicon from discarded graphite components in the silicon crystal production process. Background technique [0002] At present, with the substantial increase in the demand and production of silicon crystals, the amount of solid waste generated during the silicon crystal production process has also increased. Among them, the solid waste includes the graphite cap, graphite base and graphite card valve discarded during the silicon crystal reduction production process. [0003] Graphite cap, graphite base and graphite card valve are components in the reduction furnace for silicon crystal production. Graphite base, graphite cap and graphite card valve are assembled into an integrated structure and installed on the top of the reduction electrode. The graphite base plays the role of connecting the electrode and graphite card valve. The graphite cap plays the role of conne...
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IPC IPC(8): B03B7/00B03D1/02B03D1/018
CPCB03B7/00B03D1/018B03D1/02
Inventor 刘颀张明青
Owner CHINA UNIV OF MINING & TECH