Recycling system for waste cathode block from electrolytic aluminum and recycling method

Abstract

The invention discloses a recycling system for a waste cathode block from electrolytic aluminum and a recycling method. The invention aims to solve the technical problems of low recycling rate of the present waste cathode block, serious energy waste and high recycling cost. The recycling system comprises a high-temperature cyclone furnace and a dry purifying device, wherein the high-temperature cyclone furnace comprises a furnace body, a burner and a heat exchanger. The recycling method comprises the following steps: crushing the waste cathode block from electrolytic aluminum into powder; adding combustion improvers and burning the powder by the high-temperature cyclone furnace; preheating the secondary inlet air of the high-temperature cyclone furnace by the smoke generated by burning through the heat exchanger and purifying through the dry purifying device. The high-purity recycling of the electrolyte in the waste cathode block can be realized by the recycling system provided by the invention; the heat energy generated by powder combustion can be fully utilized; the production energy consumption is reduced; the waste of energy resource is avoided; the recycling method is simple in operation, energy-saving and environment-friendly; the recycling of the waste cathode block can be realized according to the recycling method.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment in the production process of electrolytic aluminum, in particular to a recycling treatment system and treatment method for waste cathode carbon blocks of electrolytic aluminum. Background technique [0002] In the production process of electrolytic aluminum, the cathode lining and other furnace materials are corroded by sodium, electrolyte and aluminum for a long time and absorb a large amount of fluorine-containing salt. The cell must be overhauled when it runs to a certain life (6-8 years). During the overhaul, the lining of the electrolytic cell must be replaced, including bottom cathode carbon blocks, refractory bricks, insulation bricks, anti-seepage materials and side silicon carbide bricks. Therefore, in the process of primary aluminum production, casting and electrolytic cell overhaul, a large amount of solid waste such as waste cathode carbon block, waste insulation brick, w...

AI Technical Summary

Problems solved by technology

However, the flotation method and sulfuric acid decomposition method cannot remove the cyanide in the waste cathode carbon block, and the cyanide and some fluoride enter the waste liquid and easily cause secondary pollution; the carbon in the waste cathode carbon block is recovered as fuel by the roasting method and burned The heat generated is difficult to use effectively, resulting in a large amount of energy waste, and cannot meet the requirements of strict temperature control in the roasting process

In view of the problems of low recovery rate, serious energy waste, and high recycling cost of the existing waste cathode carbon block recovery methods, it is extremely necessary to study a high-efficiency, energy-saving, and environmentally friendly electrolytic aluminum waste cathode carbon block recycling process.

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