Method for recycling sodium fluoride from electrolytic aluminium waste cathode carbon block

A waste cathode carbon block and recovery method technology, which is applied in the field of comprehensive utilization of solid waste resources, can solve the problems of environmental secondary pollution, achieve the effects of no secondary pollution, low production cost, and reduce environmental pollution

Active Publication Date: 2010-08-18
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

[0005] However, in the flotation process of the above method, a large amount of soluble fluoride (mainly sodium fluoride) contained in the spent cathode carbon block is dissolved in the flotation water...

Method used

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  • Method for recycling sodium fluoride from electrolytic aluminium waste cathode carbon block
  • Method for recycling sodium fluoride from electrolytic aluminium waste cathode carbon block

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] according to figure 1 The process flow chart shown, recovering sodium fluoride from the waste cathode carbon block of electrolytic aluminum, specifically includes the following steps:

[0026] 1. Crushing and grinding: Use a crusher to crush the waste cathode carbon blocks to -200mm, enter the high-frequency vibration mill for fine crushing to -2mm, and then enter the high-frequency vibration mill to grind to -0.074mm, accounting for 70%.

[0027] 2. Evaporation by water immersion: Then add water to the ground waste cathode carbon powder to make a slurry with a mass concentration of 20%, and carry out water immersion at a temperature of 20°C, stirring and leaching for 90 minutes and then filtering, the filter cake is washed with water, and the filtrate is combined. Then the filtrate (leaching solution) was evaporated to obtain sodium fluoride, and the distilled water was reused. The recovered sodium fluoride has a purity of 96.20% and a fluorine recovery rate of 48%. ...

Embodiment 2

[0029] according to figure 1 The process flow chart shown, recovering sodium fluoride from the waste cathode carbon block of electrolytic aluminum, specifically includes the following steps:

[0030] 1. Crushing and grinding: use a crusher to crush the waste cathode carbon blocks to -200mm, enter the high-frequency vibration mill for fine crushing to -2mm, and then enter the high-frequency vibration mill to grind to -0.074mm, accounting for 90%.

[0031] 2. Evaporation by water immersion: Then add water to the ground waste cathode carbon powder to make a slurry with a mass concentration of 50%, and carry out water immersion at a temperature of 40°C, stirring and leaching for 180 minutes and then filtering, and the leachate (filtrate) is evaporated to obtain fluorination Sodium, distilled water reuse. The recovered sodium fluoride has a purity of 96.80% and a fluorine recovery rate of 45%.

Embodiment 3

[0033] according to figure 1 The process flow chart shown, recovering sodium fluoride from the waste cathode carbon block of electrolytic aluminum, specifically includes the following steps:

[0034] 1. Crushing and grinding: Use a crusher to crush the waste cathode carbon block to -200mm, enter the high-frequency vibration mill for fine crushing to -2mm, and then enter the high-frequency vibration mill to grind to -0.074mm, accounting for 50%.

[0035] 2. Evaporation by water immersion: Then add water to the ground waste cathode carbon powder to make a slurry with a mass concentration of 10%, and then carry out water immersion at a temperature of 90°C, stirring and leaching for 50 minutes and then filtering, and the leachate (filtrate) is evaporated to obtain fluorination Sodium, distilled water reuse. The recovered sodium fluoride has a purity of 96.50% and a fluorine recovery rate of 50%.

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Abstract

The invention provides a method for recycling sodium fluoride from electrolytic aluminium waste cathode carbon block, including the steps of smashing, grinding, water leaching and evaporating. The method provided by the invention has the advantages that: (1) electrolytic aluminium waste cathode carbon block is taken as raw material, sodium fluorine is recycled from the carbon block, and production cost is low; (2) the purity obtained by the method of the invention reaches more than 95%, fluoride recovery rate reaches more than 40%; (3) the method of the invention has simple technology, distilled water obtained by evaporation can be recycled, no secondary pollution is produced, and environmental pollution caused by soluble fluoride in electrolytic aluminium waste cathode carbon block is reduced, thus being beneficial to environmental protection.

Description

technical field [0001] The invention relates to a method for recovering sodium fluoride 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, environmental pollution problems caused by exhaust gas and waste materials have become increasingly prominent. With the increase in the output of electrolytic aluminum, the output of solid waste produced by enterprises is also increasing. The waste discharged by the aluminum electrolysis industry is mainly waste cathode carbon blocks, waste anode carbon particles, waste refractory bricks, waste insulation bricks, waste heat preservation slag, etc. Normally, ev...

Claims

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Application Information

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IPC IPC(8): C01D3/02B09B3/00
Inventor 申士富
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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