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Comprehensive processing and utilizing process of quadratic aluminum dust

A comprehensive treatment and secondary aluminum technology, applied in the direction of solid waste removal, transportation and packaging, separation of dispersed particles, etc., to achieve high-efficiency separation and recycling, realize safe production, and avoid potential safety hazards

Inactive Publication Date: 2020-05-19
XINGHUA YONGTAI ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned existing technical problems, the purpose of the present invention is to provide a comprehensive treatment and utilization process of secondary aluminum ash, which can efficiently carry out harmless treatment of secondary aluminum ash, and at the same time, use this process to generate high value-added products, and there is no secondary pollution problem in the production process, the exhaust gas containing ammonia can be discharged to the atmosphere after purification and can meet the relevant national standards, which is an environmentally friendly, high-efficiency, low-energy-consuming process

Method used

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  • Comprehensive processing and utilizing process of quadratic aluminum dust
  • Comprehensive processing and utilizing process of quadratic aluminum dust
  • Comprehensive processing and utilizing process of quadratic aluminum dust

Examples

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Effect test

Embodiment 1

[0025] Please refer to figure 1 , a comprehensive treatment and utilization process of secondary aluminum ash of the present embodiment, the specific steps are as follows:

[0026] Deamination process: Add secondary aluminum ash (see Table 1 for specific composition) from an electrolytic aluminum enterprise into the water immersion deamination machine, and then pump 86°C hot water into the water immersion deamination machine with a sealed design, heat The amount of water and the amount of secondary aluminum ash are mixed according to the liquid-solid ratio of 3:1, and NaOH catalyst is added. The amount of catalyst is 4% of the amount of the secondary aluminum ash. The leaching time is 5h. After stirring, the ammonia-containing Exhaust gas, ammonia-containing waste gas escapes into the water immersion deamination machine, and then is collected to the ammonia absorption device through a closed pipeline. The ammonia gas removal rate reaches more than 90%; spray dilute sulfuric ac...

Embodiment 2

[0032] The main components of the secondary aluminum ash in Example 2 are 20% of aluminum nitride, 6% of aluminum powder, 57% of alumina, 5% of fluoride, and 12% of others.

[0033] Please refer to figure 1 , a comprehensive treatment and utilization process of secondary aluminum ash of the present embodiment, the specific steps are as follows:

[0034] Deamination process: Add the above-mentioned secondary aluminum ash to the water immersion deamination machine, and then pump 86°C hot water into the water immersion deamination machine with a sealed design. The amount of hot water and the amount of secondary aluminum ash are based on the liquid-solid ratio For 2:1 mixing, another NaOH catalyst is added, the amount of catalyst is 5% of the amount of the secondary aluminum ash, the leaching time is 5h, after stirring, the ammonia-containing waste gas escapes after the reaction, and the ammonia-containing waste gas escapes to water leaching for deamination In the machine, it is ...

Embodiment 3

[0038] The main components of the secondary aluminum ash in Example 3 are 30% of aluminum nitride, 12% of aluminum powder, 37% of alumina, 3% of fluoride, and 18% of others.

[0039] Please refer to figure 1 , a comprehensive treatment and utilization process of secondary aluminum ash of the present embodiment, the specific steps are as follows:

[0040] Deamination process: Add the above-mentioned secondary aluminum ash to the water immersion deamination machine, and then pump 86°C hot water into the water immersion deamination machine with a sealed design. The amount of hot water and the amount of secondary aluminum ash are based on the liquid-solid ratio For 4:1 mixing, another NaOH catalyst is added, the amount of catalyst is 5% of the amount of the secondary aluminum ash, the leaching time is 3h, after stirring, the ammonia-containing waste gas escapes after the reaction, and the ammonia-containing waste gas escapes to water leaching for deamination In the machine, it is...

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Abstract

The invention provides a comprehensive processing and utilizing process of quadratic aluminum dust. The process includes the following steps of deaminizing, fluorine removal and centrifugal dewatering. The harmless, efficient and resourceful processing of the quadratic aluminum dust is realized, aluminum nitride, fluoride and other harmful substances are removed, high-additional-value by-products(ammonium salt or weak aqua ammonia or the like) are obtained, and efficient separating and recycling of all components are realized. In the deaminizing step, generated ammonia gas is collected into an ammonia absorbing device through a closed pipeline, the potential safety hazard problem caused when too much gas exists in a water-immersing deaminizing machine is avoided, and safe production is realized. No secondary pollution problem exists in the producing process, ammonia-containing waste gas can reach the relevant national standard and be discharged into the atmosphere after being deaminized, generated slag can be used for preparing baking-free bricks, and the green production aim is achieved.

Description

technical field [0001] The invention relates to the field of harmless treatment and resource utilization of hazardous waste, in particular to a comprehensive treatment and utilization process of secondary aluminum ash. Background technique [0002] Aluminum ash is the solid waste generated during the aluminum smelting and processing process. Its composition contains aluminum nitride and fluoride and other toxic and harmful substances. If stacked or handled improperly, it will pollute water, soil and air, and cause harm to the environment. The "National Hazardous Waste List" (2016 edition) promulgated by the state has clearly defined aluminum ash as hazardous waste. [0003] Aluminum ash is divided into primary aluminum ash and secondary aluminum ash. The aluminum content of primary aluminum ash is between 15% and 75%. Because of its high utilization value, it has been valued by enterprises and recycled. The primary aluminum ash is usually recovered by frying ash or pressin...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00B01D53/78B01D53/58
CPCB09B3/00B09B5/00B01D53/78B01D53/58B09B3/20B09B2101/02Y02A50/20
Inventor 朱志伟
Owner XINGHUA YONGTAI ALUMINUM IND
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