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Recovery treatment method of electrolytic aluminum ash and refractory material lining waste

A refractory material, recycling technology, applied in the direction of improving process efficiency, etc., can solve problems such as environmental impact, achieve the effect of low recycling cost, simple process, and good application prospects

Active Publication Date: 2015-09-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the aluminum ash and the refractory lining waste produced during the overhaul of the electrolytic aluminum plant have not been effectively recycled and utilized, and have an impact on the environment, the present invention provides an electrolytic aluminum ash and refractory lining waste recycling method

Method used

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  • Recovery treatment method of electrolytic aluminum ash and refractory material lining waste

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Effect test

Embodiment 1

[0041] The anti-seepage and thermal insulation waste is crushed and ground until the particle size is below 80 mesh, then mixed with aluminum ash evenly, the mixing ratio is 1: (0.5~2) by weight, and then pressed into pellets; the pressure of pressing into pellets is 30~100MPa;

[0042] Place the pellets under the condition of vacuum degree ≤100Pa, heat to 1000~1400℃ for vacuum distillation, the vacuum distillation time is 1~10h, the electrolyte and metal sodium are crystallized on the crystallizer, and the main component of the remaining part is Al 2 o 3 and SiO 2 , as a raw material for the production of new anti-seepage materials;

[0043] The main components of the electrolyte are cryolite and sodium fluoride, and also contain aluminum fluoride, magnesium fluoride, calcium fluoride, potassium fluoride and lithium fluoride;

[0044] Crush the silicon carbide waste to a particle size below 60mm, then place it under the condition of vacuum degree ≤ 100Pa, heat it to 1000~1...

Embodiment 2

[0046] The anti-seepage and thermal insulation waste is crushed and ground until the particle size is below 80 mesh, then mixed with aluminum ash evenly, the mixing ratio is 1: (0.5~2) by weight, and then pressed into pellets; the pressure of pressing into pellets is 30~100MPa;

[0047] Place the pellets under the condition of vacuum degree ≤100Pa, heat to 1000~1400℃ for vacuum distillation, the vacuum distillation time is 1~10h, the electrolyte and metal sodium are crystallized on the crystallizer, and the main component of the remaining part is Al 2 o3 and SiO 2 , as a raw material for the production of new anti-seepage materials;

[0048] The main components of the electrolyte are cryolite and sodium fluoride;

[0049] Crush the silicon carbide waste to a particle size below 60mm, then place it under the condition of vacuum degree ≤ 100Pa, heat it to 1000~1200℃, vacuum distill at 1000~1200℃ for 1~10h, the electrolyte crystallizes on the crystallizer, and the rest is nitro...

Embodiment 3

[0051] The anti-seepage and thermal insulation waste is crushed and ground until the particle size is below 80 mesh, then mixed with aluminum ash evenly, the mixing ratio is 1: (0.5~2) by weight, and then pressed into pellets; the pressure of pressing into pellets is 30~100MPa;

[0052] Put the ball under the condition of vacuum degree ≤100Pa, heat to 1000~1400℃ for vacuum distillation (there is CaF in the anti-seepage insulation waste 2 ), the vacuum distillation time is 1~10h, the electrolyte and metal sodium are crystallized on the crystallizer, and the main component of the remaining part is Al 2 o 3 and SiO 2 , as a raw material for the production of new anti-seepage materials;

[0053] The main components of the electrolyte are cryolite and sodium fluoride;

[0054] Crush the silicon carbide waste to a particle size below 60mm, then place it under the condition of vacuum degree ≤ 100Pa, heat it to 1000~1200℃, vacuum distill at 1000~1200℃ for 1~10h, the electrolyte cr...

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Abstract

The invention discloses a recovery treatment method of electrolytic aluminum ash and a refractory material lining waste; the refractory lining waste is divided into an impermeable insulation waste and a silicon carbide waste; and the method comprises the following steps: (1) the impermeable insulation waste is crushed and levigated to mix with the aluminum ash to press a pellet; (2) vacuum distillation: electrolyte and metal sodium are crystallized on a crystallizer; the remainder part has main components of Al2O3 and SiO2; the silicon carbide waste is distilled at a temperature of 1000-1200 DEG C in vacuum after being crushed; the electrolyte is crystallized on the crystallizer; and the remainder part is a silicon nitride and silicon carbide refractory material. The method is simple in flow; the useful components can be fully recycled; the recovery cost is low; and meanwhile, the environmental pollution is reduced, so that the application prospect is excellent.

Description

technical field [0001] The invention relates to a method for recycling electrolytic aluminum waste, in particular to a method for recycling electrolytic aluminum ash and refractory lining waste. Background technique [0002] Aluminum is the metal material second only to steel, and its output ranks first among non-ferrous metals. In 2014, the production capacity of aluminum electrolysis in China was 35.84 million tons, and the actual output was 28.1 million tons. It is the world's largest aluminum producer. [0003] Aluminum electrolysis discharges four kinds of solid waste, two of which are spent carbon cathode lining and anode carbon slag, which belong to solid waste whose main components are carbon and electrolyte components. It has been introduced in the patent application number 2015102691795. [0004] Among the other two wastes, the first is aluminum ash: aluminum ash is the aluminum slag attached to the aluminum ladle, the aluminum slag produced by the mixing furnace ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/10C25C3/18C04B35/66
CPCY02P10/20
Inventor 冯乃祥王耀武
Owner NORTHEASTERN UNIV
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