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Method for recovering graphite from waste cathode carbon blocks in electrolytic aluminium production

A technology of waste cathode carbon block and electrolytic aluminum, which is applied in the field of comprehensive utilization of solid waste resources, can solve problems affecting cement quality, etc., and achieve the effects of stable and reliable product quality, low production cost and high yield

Active Publication Date: 2012-07-11
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Spent cathode carbon blocks have high alkalinity, which seriously affects the quality of cement

Method used

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  • Method for recovering graphite from waste cathode carbon blocks in electrolytic aluminium production
  • Method for recovering graphite from waste cathode carbon blocks in electrolytic aluminium production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 1 Shown, method of the present invention specifically comprises the following steps:

[0040] 1. Crushing and grinding, coarse crushing uses an impact crusher to crush the material to -200mm, enters the high-frequency vibration mill for fine crushing, and then enters the high-frequency vibration mill for grinding to -0.074mm, accounting for 70%.

[0041] 2. Water immersion: Add water to the ground waste cathode carbon block to adjust the slurry, and carry out water immersion. The water immersion concentration is 20%, and the water immersion temperature is 20°C. After stirring and leaching for 60 minutes, filter and wash, and the leaching solution is evaporated to obtain fluorine. Sodium chloride and distilled water are returned to the graphite recovery system.

[0042]3. Flotation, roughing I: add water to the filter cake of the waste cathode carbon block operation by water immersion to make a pulp with a mass concentration of 20%, add 400g / t of collecto...

Embodiment 2

[0048] Such as figure 1 Shown, method of the present invention specifically comprises the following steps:

[0049] 1. Crushing and grinding, coarse crushing uses a crusher to crush the material to -200mm, enters the high-frequency vibration mill for fine crushing, and then enters the high-frequency vibration mill for grinding to -0.074mm, accounting for 80%.

[0050] 2. Water immersion: Add water to the ground waste cathode carbon block to adjust the slurry, and carry out water immersion. The water immersion concentration is 50%, the water immersion temperature is 40°C, and the leaching is stirred and leached for 90 minutes, then filtered and washed, and the leaching solution is fluorinated by evaporation. Sodium, distilled water returns to the graphite recovery system.

[0051] 3. Flotation, roughing I: add water to the filter cake of the water immersion waste cathode carbon block operation to make a mass concentration of 30% ore pulp, add 200g / t of waste cathode carbon blo...

Embodiment 3

[0057] Such as figure 1 Shown, method of the present invention specifically comprises the following steps:

[0058] 1. Crushing and grinding, coarse crushing uses a crusher to crush the material to -200mm, enters the high-frequency vibration mill for fine crushing, and then enters the high-frequency vibration mill for grinding to -0.074mm, accounting for 60%.

[0059] 2. Water immersion: add water to the ground waste cathode carbon block to adjust the slurry, and carry out water immersion. The water immersion concentration is 10%, and the water immersion temperature is 60°C. After stirring and leaching for 30 minutes, filter and wash, and the leaching solution is evaporated to obtain fluorine. Sodium chloride and distilled water are returned to the graphite recovery system.

[0060] 3. Flotation, roughing I: add water to the filter cake of the water immersion waste cathode carbon block operation to make a pulp with a mass concentration of 10%, add 800g / t of collector diesel o...

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Abstract

The invention discloses a method for recovering graphite from waste cathode carbon blocks in electrolytic aluminium production, which mainly includes steps of breaking and grinding, water leaching, floatation and acid leaching. The carbon content of the finally obtained graphite powder is up to more than 80 percent, the recovery rate is up to more than 90 percent, and the graphite powder can be used as a material for the production of carbon material for aluminium electrolysis, alumina desulfurizer and the like; and the recovered graphite powder has high purity, high value in use and remarkable economic and social benefits. The purity of sodium fluoride as byproduct is up to more than 96 percent, and therefore the sodium fluoride can be sold as a product; and calcium sulfate as byproduct can replace natural gypsum to serve as retarder for the production of cement. The method has the advantages of simple technique, low production cost, no secondary pollution, stable and reliable product quality, high yield and continuous and mass production, and realizes the recycling of carbon and fluorin resources.

Description

technical field [0001] The invention relates to a method for recovering graphite from waste cathode carbon blocks of electrolytic aluminum, belonging to the field of comprehensive utilization of solid waste resources. Background technique [0002] Aluminum is recognized as a metal material with an important strategic position in the world, and is an important basic material with a supporting role in various fields of the national economy. However, with the rapid development of the aluminum electrolysis industry, the environmental pollution problems caused by waste gas and waste materials have become increasingly prominent. With the increase in the output of electrolytic aluminum, the output of solid waste generated by enterprises is increasing day by day. [0003] The waste discharged by the aluminum electrolysis industry is mainly waste cathode carbon blocks. According to statistics, about 850,000 tons of waste cathode carbon blocks are produced every year in the world. Un...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 申士富牛庆仁骆有发冯建清王金玲詹磊叶力佳侯新呼振峰贺华刘书杰刘海营
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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