Method for extracting electrolyte through rapid combustion and decarburization of carbon residue waste

Abstract

The method comprises the following steps: firstly, crushing the carbon residue waste into 20-30mm particles, lifting the particles to a particle bin by a bucket elevator, conveying the particles in the particle bin into a Raymond mill by a vibration feeder at the bottom of the particle bin, grinding the particles to 180-325 meshes, and lifting carbon residue fine powder to a storage bin by the bucket elevator for later use; starting a matched system of the rotary kiln, igniting and heating, keeping the fuel gas to burn under an oxygen-enriched condition, and spraying carbon residue fine powder when the temperature of the furnace rises to 1200-1350 DEG C; the carbon residue fine powder is injected in a pneumatic conveying mode and is injected into flames in the forward direction from the lower portion of the gas burner, and the injection amount is 1-5 t / h; carbon in the carbon residues is quickly combusted and consumed in an oxygen-enriched atmosphere, and the residual electrolyte is deposited in the rotary kiln, is discharged in the form of solid particles or blocks after passing through a high-temperature zone, a transition zone and a cooling zone in the kiln, and can be returned to the electrolytic bath again for use after being collected; and kiln tail gas is introduced into an electrolytic aluminum workshop tail gas treatment system for centralized treatment. A forward oxygen-enriched combustion method is adopted, continuous production is achieved, the treatment capacity is large, carbon in the carbon residues can be rapidly combusted, and an electrolyte product is obtained; furnace shutdown and manual slagging-off are not needed in the process, the treatment time is shortened, and harm of smoke to human bodies is reduced; heat generated by carbon combustion is fully utilized, and energy consumption is low.

Description

technical field [0001] The invention belongs to the field of comprehensive treatment of hazardous solid waste in the electrolytic aluminum industry, and in particular relates to a method for extracting electrolyte through rapid combustion and decarburization of carbon slag waste. [0002] technical background [0003] Carbon slag is a hazardous solid waste produced in the electrolytic aluminum industry, and its main components are carbon and electrolyte. The source of carbon is divided into two parts: one is the carbon that falls off or incompletely reacts when the carbon anode of the electrolytic cell participates in the electrochemical reaction process; Since the carbon density is relatively light compared to the electrolyte, it usually floats on the surface of the electrolytic cell, which has a great impact on the stable operation of the electrolytic cell. Therefore, it is usually salvaged manually during the production process. Part of the electrolyte will inevitably be ...

AI Technical Summary

Problems solved by technology

This technology has many disadvantages: intermittent production, low efficiency; a large amount of toxic and harmful fumes will inevitably be generated during the manual slag removal process, which will cause harm to human health; the salvaged carbon still contains a considerable amount of electrolytes, and its direct use performance remains to be seen. study

The shortcomings of this technology are obvious, intermittent production, low efficiency; electric heating, high energy consumption

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