Nuclear graphite based on microcrystalline graphite as raw material and preparation method thereof

A technology of microcrystalline graphite and nuclear graphite, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of no report and research of aphanitic graphite, and achieve favorable roasting and low isotropy ratio, the effect of high bending strength

Inactive Publication Date: 2018-01-19
HUNAN GUOSHENG GRAPHITE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, commercialized nuclear graphite is produced by various coke types. Regarding the application of natural graphite, flake graphite has been successfully applied to HTR-spherical fuel elements, but there has been no relevant reports and research on aphanitic graphite in the field of nuclear graphite.

Method used

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  • Nuclear graphite based on microcrystalline graphite as raw material and preparation method thereof
  • Nuclear graphite based on microcrystalline graphite as raw material and preparation method thereof
  • Nuclear graphite based on microcrystalline graphite as raw material and preparation method thereof

Examples

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Embodiment 1

[0035] The present embodiment provides a method for preparing nuclear graphite based on microcrystalline graphite as a raw material, comprising the following steps:

[0036] S1. Raw ore treatment: crush the microcrystalline graphite raw ore, and then carry out deep grinding on the microcrystalline graphite raw ore, and obtain the material with a fineness of -0.074mm through grinding, and the content of the material with a grinding fineness of -0.074mm accounts for 90% % of the raw ore samples are subjected to flotation, using a roughing process, four selections, and a sweeping process, followed by drying and magnetic separation to obtain microcrystalline graphite with a fixed carbon content of 90%;

[0037] In the raw ore treatment of this embodiment, the raw ore of microcrystalline graphite is Lutang graphite, wherein the moisture is 2.4%, the volatile matter is 2.99%, the ash content is 18.37%, and the carbon content is 78.64%;

[0038] S2. Purification by acid leaching:

...

Embodiment 2

[0053] The present embodiment provides a method for preparing nuclear graphite based on microcrystalline graphite as a raw material, comprising the following steps:

[0054] S1. Raw ore treatment: crush the microcrystalline graphite raw ore, and then carry out deep grinding on the microcrystalline graphite raw ore, and obtain the material with a fineness of -0.074mm through grinding, and the content of the material with a grinding fineness of -0.074mm accounts for 90% % of the raw ore samples are subjected to flotation, using a roughing process, four selections, and a sweeping process, followed by drying and magnetic separation to obtain microcrystalline graphite with a fixed carbon content of 90%;

[0055] In the raw ore treatment of this embodiment, the raw ore of microcrystalline graphite is Lutang graphite, wherein the moisture is 2.4%, the volatile matter is 2.99%, the ash content is 18.37%, and the carbon content is 78.64%;

[0056] S2. Purification by acid leaching:

...

Embodiment 3

[0068] The present embodiment provides a method for preparing nuclear graphite based on microcrystalline graphite as a raw material, comprising the following steps:

[0069] S1. Raw ore treatment: crush the microcrystalline graphite raw ore, and then carry out deep grinding on the microcrystalline graphite raw ore, and obtain the material with a fineness of -0.074mm through grinding, and the content of the material with a grinding fineness of -0.074mm accounts for 90% % of raw ore samples are subjected to flotation, such as figure 1 As shown, a roughing process is adopted for four times of selection and one sweeping process, followed by drying and magnetic separation to obtain microcrystalline graphite with a fixed carbon content of 90%;

[0070] In the raw ore treatment of this embodiment, the raw ore of microcrystalline graphite is Lutang graphite, wherein the moisture is 2.4%, the volatile matter is 2.99%, the ash content is 18.37%, and the carbon content is 78.64%;

[007...

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Abstract

The invention relates to the technical field of microcrystalline graphite production and discloses nuclear graphite based on microcrystalline graphite as a raw material and a preparation method thereof. The nuclear graphite prepared from cryptocrystalline graphite has ultrahigh heat conductivity, high graphitization, low isotropic ratio and higher bending strength; compared with various cokes in the prior art, the nuclear graphite has the advantages that isotropic graphite at isotropic ratio of 1.1-1.15 is easily acquired in the manner of isostatic pressing and the thermal diffusivity of greenware of microcrystalline graphite is far higher than that of green ware of coke powder, so that the microcrystalline graphite is more beneficial to baking; the equivalent weight of ash content and boron in the nuclear graphite prepared according to the invention can meet the impurity requirement of nuclear graphite.

Description

technical field [0001] The invention relates to the technical field of production of microcrystalline graphite, and more specifically relates to a nuclear graphite based on microcrystalline graphite as a raw material and a preparation method thereof. Background technique [0002] Graphite is a high-energy crystalline carbon material, widely used in metallurgy, machinery, environmental protection, chemical industry, refractory, new energy, nuclear energy, electronics, fields such as medicine, military industry and aerospace. [0003] my country's natural graphite has good geological conditions, wide distribution, rich resources and good quality. Its reserves and output rank first in the world, and it is one of my country's advantageous minerals. Natural graphite can be divided into crystalline graphite and microcrystalline graphite according to the degree of crystallization. Among them, aphanitic graphite in Chenzhou accounts for about 74.7% of the country's total reserves, ...

Claims

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Application Information

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IPC IPC(8): C01B32/215C04B35/52C04B35/622
Inventor 林前锋李丽萍
Owner HUNAN GUOSHENG GRAPHITE TECH CO LTD
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