Method and device for rapidly repairing waste cathode carbon based on high-temperature thermal shock

Abstract

The invention discloses a simple, convenient and rapid waste electrolytic aluminum cathode carbon block repairing and recycling strategy, and particularly relates to a waste cathode carbon rapid repairing method and device based on high-temperature thermal shock. The method comprises the following steps: crushing waste cathode carbon blocks, and screening the crushed cathode carbon by using a standard sieve for later use; accurately weighing cathode carbon powder, putting the cathode carbon powder into a quartz tube, sealing the quartz tube with a graphite block, and connecting two ends of the quartz tube with a high-temperature thermal shock system through electrode bars; and treating the waste cathode carbon by using a high-temperature thermal shock system. Fluorides and other toxic substances in the waste cathode carbon blocks can be efficiently removed based on the capacitor discharge heating device, impurity elements in cathode carbon are decomposed and escaped after high-temperature thermal shock treatment, and the fixed carbon content is increased from 72% to 95%. The waste cathode carbon repairing device and method have the advantages of being low in energy consumption, short in reaction time, simple in reaction device, low in cost, easy to operate and the like, and an effective method is provided for clean recovery and high-value utilization of carbon-based solid waste.

Description

technical field [0001] The invention relates to a quick repair method and device for waste cathode carbon, belonging to the field of hazardous solid waste treatment and environmental protection. Background technique [0002] Spent Cathode Carbon, SCC is a kind of solid waste produced in the aluminum electrolysis industry. With the development of the electrolytic aluminum industry, the consumption and waste of cathode carbon are increasing rapidly. At the same time, cathode carbon in the electrolytic aluminum industry is inevitably eroded by high-temperature electrolytes, molten aluminum, metallic sodium and other substances, so there are a large amount of fluorinated carbon, alumina, cryolite, aluminosilicate, cyanide in the waste cathode carbon (0.2-1wt%) and waste tank lining SPL and other impurities. Untreated cyanide and fluoride will seriously damage the environment, so the waste of electrolytic aluminum cathode carbon will cause serious pollution of the environment an...

AI Technical Summary

Problems solved by technology

In this process, high graphitized carbon is used as fuel, which is a serious waste of carbon resources and produces a large amount of waste residue

[0007] Third, the vacuum distillation method can separate the carbon in the spent cathode carbon block and remove impurities at the same time, but it has the disadvantages of high energy consumption and long process cycle

[0008] In short, the traditional separation and recovery methods mentioned above have the disadvantages of high energy consumption, long process time, low added value, and poor environmental friendliness.

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