A flotation method for recovering carbon and electrolyte from waste cathode carbon blocks of aluminum electrolytic cell

A technology of aluminum electrolytic cell waste and cathode carbon blocks, which is applied in flotation, solid separation, etc., can solve the problems of large dosage of chemicals and many stages of flotation, and achieve the goals of less dosage of chemicals, improved economic benefits, and enhanced efficiency Effect

Inactive Publication Date: 2018-07-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems such as large dosage of chemicals and many flotation stages in the flotation process of the existing waste cathode carbon blocks, the present invention provides a flotation method for recovering carbon powder and electrolyte from the waste cathode carbon blocks of aluminum electrolytic cells , in order to achieve the purpose of ensuring the purity and recovery rate of good carbon powder with less dosage of chemicals and fewer flotation stages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step (1): Crushing and milling:

[0038] First use a jaw crusher to crush the cathode carbon block of 1kg of the waste cathode carbon block of the electrolytic aluminum tank to -30mm, then use a fine crusher to crush it to -2mm, and finally use a ball mill to grind it to a particle size of 200 mesh, of which -200 mesh 80%.

[0039] Step (2): Flotation:

[0040]Take the waste cathode carbon powder that has been ground in step (1) and add it to water according to the solid-to-liquid mass ratio of 1:10, then add CaO equivalent to 105% of the soluble fluoride content (or substance amount) until the precipitation is complete; then add Collector composed of 0.45g kerosene and 0.15g sodium oleate, foaming agent: 0.12g methyl isobutyl carbinol, conditioner: 0.3g water glass; flotation for 10min. After flotation, the upper layer is carbon powder and the lower layer is electrolyte. By calculation, the electrolyte recovery rate is 86.25%, the carbon powder purity is 86.53%, and...

Embodiment 2

[0055] Step (1): Crushing and milling:

[0056] First use a jaw crusher to crush the cathode carbon block of 1kg of the waste cathode carbon block of the electrolytic aluminum tank to -30mm, then use a fine crusher to crush it to -2mm, and finally use a ball mill to grind it to a particle size of 200 mesh, of which -200 mesh 85%.

[0057] Step (2): Flotation:

[0058] Take the waste cathode carbon powder that has been ground in step (1) and add it to water according to the solid-to-liquid mass ratio of 1:15, then add CaO equivalent to 110% of the soluble fluoride content (or amount of substance) until the precipitation is complete; then add Collector composed of 0.1g kerosene, 0.2g diesel oil, 0.06g sodium dodecylbenzenesulfonate and 0.09g sodium oleate, foaming agent: No. 2 oil 0.08g and camphor oil 0.04g, conditioner : Water glass 0.25g; flotation 8min. After flotation, the upper layer is carbon powder and the lower layer is electrolyte. By calculation, the electrolyte r...

Embodiment 3

[0060] Compared with Example 2, the difference is that the collector consists of 0.2g kerosene, 0.2g diesel oil, 0.08g sodium dodecylbenzenesulfonate and 0.12g sodium oleate. After flotation, the upper layer is carbon powder and the lower layer is electrolyte. By calculation, the electrolyte recovery rate is 86.29%, the carbon powder purity is 86.33%, and the recovery rate is 86.14%.

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Abstract

The invention discloses a floatation method for recycling carbon and electrolyte from a waste cathode carbon block of an aluminum electrolysis cell. The floatation method comprises the following steps that (1) the cathode carbon block is crushed and ground into powder; and (2) cathode carbon powder obtained through powder grinding in the step (1) and a floatation agent are subjected to mixing, slurry mixing, floatation and separation to obtain the carbon and the electrolyte. The floatation agent comprises collecting agents, a foaming agent and a conditioning agent; the collecting agents are composed of the collecting agent A1 and the collecting agent A2 with the mass ratio being 0.65-0.75:0.25-0.35. The collecting agent A1 is selected from at least one of coal tar, heavy oil, kerosene and diesel oil; and the collecting agent A2 is selected from at least one of dodecylamine, sodium dodecyl benzene sulfonate, sodium oleate and sodium dodecyl sulfate. The foaming agent is selected from at least one of number two oil, camphor oil, methyl isobutyl carbinol and mixed fatty alcohol. The conditioning agent is water glass. By means of the floatation method, the carbon powder and the electrolyte are effectively separated and recycled from the waste cathode carbon block.

Description

technical field [0001] The invention belongs to the field of carbon waste recovery, and in particular relates to a flotation method for recovering carbon and electrolyte from waste cathode carbon blocks of an aluminum electrolytic cell. Background technique [0002] In the world, metal aluminum has become an important basic material for national economic development. However, in the production process of electrolytic aluminum, due to the erosion of electrolyte, about 10kg of waste cathode carbon blocks will be produced for every ton of electrolytic aluminum produced, which has become the main solid pollutant in the aluminum electrolysis industry. Taking 2015 as an example, the output of electrolytic aluminum in my country has reached 31.41 million tons, and more than 300,000 tons of waste cathode carbon blocks have been produced, which is huge and cannot be ignored. [0003] In the waste cathode carbon block produced by aluminum electrolysis, the main components are carbon,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/018B03D1/02B03D101/02B03D101/04B03D101/00
CPCB03D1/018B03D1/02B03D2201/007B03D2201/02B03D2201/04
Inventor 田忠良杨凯肖劲袁杰郭伟昌赖延清李劼
Owner CENT SOUTH UNIV
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