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

A waste cathode carbon block and treatment system technology, applied in chemical instruments and methods, combustion methods, separation methods, etc., can solve the problems of inability to achieve strict temperature control, difficult to use heat effectively, and inability to remove cyanide, etc. recycling, reducing the cost of solid waste treatment, and achieving the effect of cleaner production

Active Publication Date: 2014-06-11
ZHENGZHOU JINGWEI TECH & IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 ener

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: A kind of electrolytic aluminum waste cathode carbon block processing system, such as Figure 1~Figure 4As shown, it includes a high-temperature cyclone furnace 1 and a dry purification device. The high-temperature cyclone furnace 1 includes a furnace body 2, a burner 3 and a heat exchanger 4; the upper part of the furnace body 2 is provided with a raw material box 5, and the lower part is provided with a combustion chamber 6, the raw material box 5 and the combustion chamber 6 are connected through a feed passage, and a feed valve 7 is provided on the feed passage, and the combustion chamber 6 is provided with an air inlet 8, a flue gas The pipeline 9 and the discharge port 10 are provided with an air volume regulating valve on the air inlet 8; the burner 3 is arranged below the combustion chamber 6; the heat exchanger 4 is arranged at the bottom of the combustion chamber 6 The outside includes a cold air inlet 11, a hot air outlet 12, a high temperature ...

Embodiment 2

[0041] Embodiment 2: A method for recycling electrolytic aluminum waste cathode carbon blocks, comprising the following steps:

[0042] (1) Jaw breaking and ball milling the electrolytic aluminum waste cathode carbon block to obtain powder with a particle size of 50 mesh to 200 mesh;

[0043] (2) Add the powder obtained in step (1) into the high-temperature cyclone furnace in the waste electrolytic aluminum cathode carbon block recycling system, add a combustion enhancer to fully burn the carbon powder in the powder, and the combustion The additive amount of the agent is 3‰ of the mass of the powder. The combustion enhancer is composed of nitrate, potassium permanganate, calcium oxide, iron oxide and starch, wherein the mass percentage of each component is: 3% of nitrate, 40% of potassium permanganate, 6% of calcium oxide, oxidized Iron 8%, the balance is starch;

[0044] (3) The high-temperature flue gas obtained from powder combustion in step (2) passes through the heat ex...

Embodiment 3

[0048] Example 3: The difference from Example 2 is that the addition amount of the combustion aid in step (2) is 5‰ of the mass of the powder, and the mass percentage of each component of the combustion aid is: nitric acid Salt 1%, potassium permanganate 20%, calcium oxide 4%, iron oxide 5%, and the balance is starch.

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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...

Claims

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Application Information

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IPC IPC(8): F23G7/00F23J15/02B01D53/02C25C3/08
Inventor 王旭东曹国法朱振国袁志强和清霖冯晓强曹志伟刘威
Owner ZHENGZHOU JINGWEI TECH & IND
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