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Charcoal blocks with semi- graphitic side part for electrolyzing aluminium and production process thereof

A semi-graphite and aluminum electrolysis technology, applied in the field of metallurgy, can solve the problems of complex production process, increase production cost, poor wetting of aluminum, etc., and achieve the effect of reducing production cost, saving addition amount, and low adsorption capacity

Active Publication Date: 2008-11-19
四川启明星铝业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) Poor wetting of aluminum
As the side wall material of the electrolytic cell, silicon carbonitride brick has the excellent characteristics of strong corrosion resistance, good thermal conductivity, high mechanical strength and good thermal conductivity, so many aluminum electrolysis enterprises currently use silicon carbonitride brick as the electrolytic cell. The side wall material of the groove, but the production process of this material is relatively complicated and the price is relatively expensive, which greatly increases the production cost of the enterprise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 Preparation of semi-graphitic side carbon block for aluminum electrolysis of the present invention

[0021] 1. Manually screen the waste cathode lining produced during the overhaul of the electrolyzer: decompose the waste cathode lining material produced during the overhaul of the electrolyzer into small pieces, clean up the floating dust on the surface, and remove the white and yellowish parts of the surface.

[0022] 2. Remove the white and yellowish part of the surface color of the waste cathode lining and manually break it into small pieces with a size below 600mm.

[0023] 3. Add an appropriate amount of water to the small pieces after manual crushing to moisten them, and further crush them with a crusher. The particle size is controlled within the range of 0-2mm by screening.

[0024] 4. Dry the crushed material.

[0025] 5. Ingredients: Melt 100kg of asphalt, then 175kg of spent cathode lining material, 200kg of calcined anthracite (about 30% of the pa...

Embodiment 2

[0032] Example 2 Preparation of semi-graphitic side carbon block for aluminum electrolysis of the present invention

[0033] 1. Manually screen the waste cathode lining produced during the overhaul of the electrolyzer: decompose the waste cathode lining material produced during the overhaul of the electrolyzer into small pieces, clean up the floating dust on the surface, and remove the white and yellowish parts of the surface.

[0034] 2. Remove the white and yellowish part of the surface color of the waste cathode lining and manually break it into small pieces with a size below 600mm.

[0035] 3. Add an appropriate amount of water to the small pieces after manual crushing to moisten them, and further crush them with a crusher. The particle size is controlled within the range of 0-2mm by screening.

[0036] 4. Dry the crushed material.

[0037] 5. Ingredients: Melt 90kg of asphalt, then 225kg of spent cathode lining material, 185kg of calcined anthracite (about 30% of the par...

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Abstract

The invention relates to a half graphite side carbon block used in aluminum electrolysis and a method for making the same, belonging to the metallurgy field and solving the technical problem that the prior half graphite side carbon block has higher manufacturing cost. The half graphite side carbon block is made form raw materials of the following proportioning by weight: 30 to 50 portions of waste cathode inner lining material, 20 to 40 portions of calcined anthracite and 15 to 22 portions of bitumen, wherein the waste cathode inner lining material is made through removing the yellowing part and the whitening part of the cathode inner lining material generated during the general overhaul of an electrolytic bath. The half graphite side carbon block can be used as the side wall material of an electrolytic bath; meanwhile, waste cathode inner lining material is added in the raw materials for production of the carbon block so as to prevent the waste cathode inner lining material from polluting the environment; moreover, the resistivity of the half graphite side carbon block is superior to that of the prior half graphite side carbon block, and the half graphite side carbon block can reduce the addition of electrolyte and has a broad application prospect.

Description

technical field [0001] The invention relates to a semi-graphite side carbon block for aluminum electrolysis and a production method thereof, belonging to the field of metallurgy. Background technique [0002] At present, semi-graphitic side carbon blocks for aluminum electrolytic cells are mainly formed by kneading calcined anthracite, graphite powder, pitch and other materials, and then roasted at high temperature. Coal and graphite powder are the main components of the semi-graphitic side carbon block. Coal is a non-renewable resource. At present, the price of high-quality anthracite is relatively high, and coal must be calcined at high temperature before it can be used to make semi-graphitic side carbon blocks. Generally, the calcining temperature is between 1800-1900 ° C, and the required energy consumption Larger, plus the current paste needs to add a certain amount (generally all above 20%) graphite powder with higher price, so the production cost of the semi-graphite...

Claims

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Application Information

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IPC IPC(8): C04B35/532C04B35/64C25C3/08
Inventor 王有来卢敏李勇
Owner 四川启明星铝业有限责任公司
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