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
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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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