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A kind of method of aluminum ash dechlorination

A technology of aluminum ash and dechlorination, which is applied in cement production, etc., can solve the problems of limiting aluminum ash and increasing the disposal cost of washing liquid, and achieves the effects of reducing leaching concentration, efficient dechlorination, and simple process

Active Publication Date: 2022-04-26
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, aluminum nitride in aluminum ash will slowly decompose and release ammonia when it meets water, which limits the development of wet dechlorination of aluminum ash.
At the same time, the heavy metals in the aluminum ash will be transferred to the washing solution during the washing process, thereby increasing the disposal cost of the washing solution

Method used

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  • A kind of method of aluminum ash dechlorination
  • A kind of method of aluminum ash dechlorination
  • A kind of method of aluminum ash dechlorination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 The influence of aluminum ash mechanical grinding time on the dechlorination efficiency of aluminum ash

[0025] The aluminum ash was mechanically ground for 0.5h, 1.5h, 2.5h, 3.5h, and 4.5h respectively to obtain five groups of activated aluminum ash. The activated aluminum ash was placed in a high-temperature steam generator for 0.5h to obtain five groups of denitrified aluminum ash, wherein the air temperature in the high-temperature steam generator was 100°C and the relative air humidity was 90%. Dissolve sodium silicate in water to prepare a sodium silicate aqueous solution with a concentration of 0.05mol / L. According to the liquid-solid ratio of 0.4:1 (mL:mg), the sodium silicate aqueous solution and the denitrified aluminum ash were weighed, mixed, stirred for 2 hours, and left to age for 6 hours to obtain five groups of aluminum ash stable slurries. According to the volume ratio of water and aluminum ash stabilized slurry is 1:1, weigh water and alumi...

Embodiment 2

[0039] Example 2 The concentration of sodium silicate aqueous solution affects the dechlorination efficiency of aluminum ash

[0040] The aluminum ash was mechanically ground for 2.5 hours to obtain activated aluminum ash. The activated aluminum ash was disposed in a high-temperature steam generator for 2.5 hours to obtain denitrified aluminum ash, wherein the air temperature in the high-temperature steam generator was 200°C and the relative air humidity was 95%. Dissolve sodium silicate in water to prepare sodium silicate aqueous solutions with concentrations of 0.05mol / L, 0.1625mol / L, 0.275mol / L, 0.3875mol / L, and 0.5mol / L. According to the liquid-solid ratio of 0.6:1 (mL:mg), the sodium silicate aqueous solution and the denitrified aluminum ash were weighed, mixed, stirred for 6 hours, and left to age for 15 hours to obtain five groups of aluminum ash stable slurries. According to the volume ratio of water and aluminum ash stabilized slurry of 2:1, weigh water and aluminum ...

Embodiment 3

[0049] Example 3 The influence of water and aluminum ash stabilized slurry volume ratio on aluminum ash dechlorination efficiency

[0050] The aluminum ash was mechanically ground for 4.5 hours to obtain activated aluminum ash. The activated aluminum ash was disposed in a high-temperature steam generator for 4.5 hours to obtain denitrified aluminum ash, wherein the air temperature in the high-temperature steam generator was 300°C and the relative air humidity was 100%. Dissolve sodium silicate in water to prepare a sodium silicate aqueous solution with a concentration of 0.5mol / L. According to the liquid-solid ratio of 0.8:1 (mL:mg), the aqueous solution of sodium silicate and the denitrified aluminum ash were weighed, mixed, stirred for 10 hours, and left to age for 24 hours to obtain a stable slurry of aluminum ash. According to the volume ratio of water and aluminum ash stabilized slurry 1:1, 1.5:1, 2:1, 2.5:1, 3:1, respectively weigh water and aluminum ash stabilized slur...

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Abstract

The invention discloses a method for dechlorinating aluminum ash. The method realizes high-efficiency dechlorination of aluminum ash through three consecutive steps of high-temperature water vapor denitrification, silicate stabilization of heavy metals, and water elution of chlorine. The leaching concentration is significantly reduced, and the process is simple. The achievable chlorine removal rate is 96% to 99%, the leaching concentration of zinc, copper and chromium is reduced by 97% to 99%, and the leaching concentration of nickel, lead and cadmium is reduced by 99% to 100%.

Description

technical field [0001] The invention relates to a method for dechlorination of aluminum ash, which belongs to the field of harmless disposal of solid waste. Background technique [0002] A large amount of aluminum ash is easily produced in the process of aluminum electrolysis, casting and recycling of waste aluminum. Each ton of aluminum-based products is accompanied by the output of 10-30kg of aluminum ash. At present, the annual output of aluminum ash in my country exceeds 1 million tons, but so far no effective resource utilization method has been found to consume aluminum ash. If the aluminum ash is randomly buried, it will easily cause soil salinization and heavy metal pollution. Aluminum ash is generally composed of 10% to 80% metal aluminum, 40% to 70% alumina, 10% to 30% aluminum nitride, 3% to 15% chloride salt and other impurities. [0003] At present, there are two main approaches to resource utilization of aluminum ash, one is to recycle aluminum in aluminum a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B7/38C04B7/42
CPCY02P40/10
Inventor 黄涛宋东平张树文周璐璐徐娇娇
Owner CHANGSHU INSTITUTE OF TECHNOLOGY