Method for recovering carbon from waste cathode carbon blocks of electrolytic aluminum

A technology for waste cathode carbon block and electrolytic aluminum, which is applied in the field of comprehensive utilization of solid waste resources, can solve problems such as secondary pollution of the environment, and achieve the effects of no secondary pollution, reduced production cost and low production cost.

Active Publication Date: 2010-09-15
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] The waste cathode carbon block contains a large amount of soluble sodium fluoride. During the flotation process, soluble sodium fluoride and other substances

Method used

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  • Method for recovering carbon from waste cathode carbon blocks of electrolytic aluminum
  • Method for recovering carbon from waste cathode carbon blocks of electrolytic aluminum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 Shown, method of the present invention specifically comprises the following steps:

[0036] 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%.

[0037] 2. Water immersion: add water to the ground waste cathode carbon block to adjust the slurry, then carry out water immersion, the concentration of water immersion is 20%, stirring and leaching for 60 minutes, the leaching solution is evaporated to obtain sodium fluoride, and the distilled water is reused.

[0038] 3. Flotation, roughing I: filter the waste cathode carbon block powder after water immersion, wash and then filter, add water to the filter cake to make a slurry with a mass concentration of 20%, and add 400g / t waste cathode carbon block capture to the slurry. Collecting agent diesel oil, 160g / t...

Embodiment 2

[0041] Such as figure 1 Shown, method of the present invention specifically comprises the following steps:

[0042] 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%.

[0043] 2. Water immersion: Add water to the ground waste cathode carbon block to adjust the slurry, then carry out water immersion, the concentration of water immersion is 50%, stirring and leaching for 90 minutes, the leaching solution is evaporated to obtain sodium fluoride, and the distilled water is returned to the graphite recovery system.

[0044] 3. Flotation, roughing I: filter the waste cathode carbon block powder after water immersion, wash and then filter, add water to the filter cake to make a slurry with a mass concentration of 30%, and add 200g / t of spent cathode carbon block to the slurry. Collecting age...

Embodiment 3

[0047] Such as figure 1 Shown, method of the present invention specifically comprises the following steps:

[0048]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%.

[0049] 2. Water immersion: Add water to the ground waste cathode carbon block to adjust the slurry, then carry out water immersion, the concentration of water immersion is 10%, stirring and leaching for 30 minutes, the leaching solution is evaporated to obtain sodium fluoride, and the distilled water is returned to the graphite recovery system.

[0050] 3. Flotation, roughing I: filter the waste cathode carbon block powder after water immersion, wash and then filter, add water to the filter cake to make a pulp with a mass concentration of 10%, and add 800g / t waste cathode carbon block to the pulp. Collecting agent diese...

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Abstract

The invention discloses a method for recovering carbon from waste cathode carbon blocks of electrolytic aluminum. The method mainly comprises the following steps of: crushing, grinding, leaching in water, floating, and the like. The method has the advantages that the carbon content of recovered powdered carbon reaches higher than 70 percent, and the carbon recovery rate reaches higher than 98 percent, thus the recovered powdered carbon can be used for preparing carbon materials for aluminum electrolysis, aluminum oxide desulfurizing agents, and the like; and the method has simple process, low production cost, no secondary pollution, stable and reliable product quality and high yield, can realize continuous scale production and is beneficial to environmental protection.

Description

technical field [0001] The invention relates to a method for recovering carbon 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. Unde...

Claims

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Application Information

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IPC IPC(8): B09B5/00B09B3/00C25C3/08
Inventor 申士富
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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