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

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...

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