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An acid-base combined process that fully realizes resource utilization of high-fluorine secondary aluminum ash

A high-fluorine secondary aluminum ash, acid-base combination technology, applied in the direction of aluminum compounds, ammonia compounds, alumina/aluminum hydroxide, etc., can solve the problems of high energy consumption, complicated process, and low product value

Active Publication Date: 2021-09-14
CENT SOUTH UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is complex in process, high in energy consumption, low in product value, and uneconomical

Method used

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  • An acid-base combined process that fully realizes resource utilization of high-fluorine secondary aluminum ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The specific operation is as follows:

[0039] (1) Use a ball mill to sieve 3 kg of secondary high-fluorine aluminum ash after ball milling. The yield on the sieve is 4.18%, the grade of metal aluminum is 72.6%, and the recovery rate is 71%. The under-sieve is divided into A (958g), B ( 1916g) two servings;

[0040] (2) Add part A of aluminum ash and water into the reaction kettle at a liquid-solid ratio of 5:2, heat and stir at 100°C for leaching for 4 hours, and recover the overflowing ammonia gas with water to prepare ammonia water;

[0041] (3) Add an appropriate amount of concentrated hydrochloric acid to the water immersion solution to prepare 3.5mol / L hydrochloric acid, and perform acid leaching and stirring leaching at a liquid-solid ratio of 5:1. The leaching temperature is room temperature and the time is 1h;

[0042] (4) Solid-liquid separation is carried out after acid leaching to obtain acid leaching residue and acid leaching solution. The yield of acid l...

Embodiment 2

[0049] The specific operation is as follows:

[0050] (1) Use a ball mill to sieve 2.3 kg of secondary high-fluorine aluminum ash after ball milling. The yield on the sieve is 4.8%, the grade of metal aluminum is 68.1%, and the recovery rate is 76.55%. 1247g) two servings;

[0051] (2) Add part A of aluminum ash and water into the reaction kettle at a liquid-solid ratio of 5:2, heat and stir at 100°C for leaching for 4 hours, and recover the overflowing ammonia gas with water to prepare ammonia water;

[0052] (3) Add an appropriate amount of concentrated hydrochloric acid to the water immersion solution to prepare 4mol / L hydrochloric acid, and perform acid leaching and stirring leaching at a liquid-solid ratio of 5:1. The leaching temperature is room temperature and the time is 1h;

[0053] (4) Solid-liquid separation is carried out after acid leaching to obtain acid leaching residue and acid leaching solution. The yield of acid leaching residue is 43.52%, which is alumina ...

Embodiment 3

[0060] The specific operation is as follows:

[0061] (1) Use a ball mill to sieve 2.4kg of secondary high-fluorine aluminum ash after ball milling. The yield on the sieve is 3.94%, the grade of metal aluminum is 73.5%, and the recovery rate is 67.82%. The under-sieve is divided into A (960g), B (1325g) two servings;

[0062] (2) Add part A of aluminum ash and water into the reaction kettle at a liquid-solid ratio of 5:2, heat and stir at 100°C for leaching for 4 hours, and recover the overflowing ammonia gas with water to prepare ammonia water;

[0063] (3) Add an appropriate amount of concentrated hydrochloric acid to the water immersion solution to prepare 2.25mol / L hydrochloric acid, carry out acid leaching and stirring leaching according to the liquid-solid ratio of 10:1, the leaching temperature is room temperature, and the time is 1h;

[0064] (4) Solid-liquid separation is carried out after acid leaching to obtain acid leaching residue and acid leaching solution. The...

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Abstract

The invention provides an acid-base combined process for fully realizing the resource utilization of high-fluorine secondary aluminum ash, which comprises the following steps: ball milling and screening the high-fluorine secondary aluminum ash to remove metal aluminum and divide it into two parts; First water leaching and then acid leaching, after acid leaching, solid-liquid separation is carried out to obtain acid leaching liquid and acid leaching residue; the other part is mixed with alkali solution, and after alkali leaching, solid-liquid separation is carried out to obtain alkali leaching liquid and alkali leaching residue; acid leaching The pH value is close to neutral after the liquid and the alkali immersion liquid are mixed in proportion, filtered after stirring, roasted and dehydrated after the solid is dried to obtain the electrolyte product, and the filtrate is returned to the ball milling process. The invention realizes the harmless utilization of high-fluorine secondary aluminum ash, and produces reusable products such as electrolyte, ammonia water, high-purity alumina and salts, realizes resource circulation, and effectively solves the problem of separate acid process or alkali The neutralization problem of the process reduces the acid-base consumption and the by-product salt output of the electrolytic aluminum ash in the treatment unit, and improves the economic benefits of the enterprise, which has important practical significance and practical value.

Description

technical field [0001] The invention relates to the field of recycling and utilization of waste resources in the aluminum industry, in particular to an acid-base combined process for fully realizing resource utilization of high-fluorine secondary aluminum ash. Background technique [0002] In recent years, my country's aluminum industry has developed rapidly, and its output has continued to increase. It has become a major aluminum producer in the world, and a large amount of aluminum ash is produced in the production process of the aluminum industry. The main substances in aluminum ash are metal aluminum, oxides, aluminum nitride, fluorides, and salt solvents. Although they have high recycling value, their various substances exist in a complex mixed state, and it is difficult to separate and recycle. And the cost is high, so many companies will give up this part of the resources and store them or landfill them. High-fluorine secondary aluminum ash (the remaining part of alu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/02C01D3/14C01D5/16C01F7/02C01F7/22C25C3/18
CPCC01C1/022C01D3/14C01D5/16C01F7/02C01F7/22C25C3/18
Inventor 张国范邓传宏刘琨石晴李松春冯海港荀骆冰镇思远
Owner CENT SOUTH UNIV