Recycling method of waste hydrochloric acid containing aluminum

A technology of waste hydrochloric acid and hydrochloric acid, applied in aluminum chloride, aluminum halide and other directions, can solve the problems of low recycling rate and high processing cost of waste hydrochloric acid washing solution of aluminum castings, achieve good adsorption and regeneration performance, reduce salt content, equipment simple effect

Inactive Publication Date: 2012-07-18
张炜铭 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a recycling method for aluminum-containing waste hydrochloric acid, aiming at the problems of low recycling rate and high processing cost of aluminum casting waste hydrochloric acid, which are common in industries such as automobiles, household appliances, aviation, mechanical equipment, electroplating, and metallurgy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 10mL (about 7 grams) of NDA900 resin into a glass resin column (Φ12×160mm) with an insulating jacket. The NDA900 resin is provided by Jiangsu Yongtai Environmental Protection Technology Co., Ltd., with styrene-diethylene copolymer as the skeleton. Surface area of ​​38 m 2 / g, the quaternary amine group carried is trimethylamine, and the exchange capacity is 3.8mmol / g. The 150mL aluminum casting waste hydrochloric pickling solution discharged from the production workshop has a HCl concentration of about 4.5mol / L and an aluminum ion content of about 11000mg / L. After being filtered by a sand filter, it flows downward through the above resin column with a flow rate of 1BV / h , the temperature is 25°C, the HCl concentration of the treated effluent is about 4.5mol / L, and the aluminum ion concentration is about 200mg / L. Industrial hydrochloric acid can be added to increase the concentration of HCl to 8mol / L and then return to the production process as aluminum The casting ...

Embodiment 2

[0027] Put 100 mL (approximately 72 grams) of NDA900 resin into a glass resin column (Φ25×250mm) with an insulating jacket. The NDA900 resin is provided by Jiangsu Yongtai Environmental Protection Technology Co., Ltd., with styrene-diethylene copolymer as the skeleton. The specific surface area is 38 m 2 / g, the quaternary amine group carried is trimethylamine, and the exchange capacity is 3.8mmol / g. The 1600 mL aluminum casting waste hydrochloric pickling solution discharged from the production workshop has a HCl concentration of about 6 mol / L and an aluminum ion content of about 9000 mg / L. BV / h, the temperature is 5°C, the HCl concentration of the treated effluent is about 6 mol / L, and the aluminum ion concentration is about 500 mg / L. Industrial concentrated hydrochloric acid can be added to increase the concentration of HCl to 8 mol / L before returning to production The process is used as a hydrochloric acid washing solution for aluminum castings; 150 mL of deionized water ...

Embodiment 3

[0029] Put 10 mL (about 7.5 g) of Amberlite IRA-96 resin into a glass resin column (Φ12 × 160mm) with an insulating jacket, where the Amberlite IRA-96 resin is provided by DOW, and the styrene-diethylene copolymer is used as Skeleton with a specific surface area of ​​122 m 2 / g, the quaternary amine group carried is triethylamine, and the exchange amount is 2.8mmol / g. The 140 mL aluminum casting waste hydrochloric pickling solution discharged from the production workshop has a HCl concentration of about 5 mol / L and an aluminum ion content of about 15,000 mg / L. After being filtered through a sand filter, it flows downward through the above-mentioned resin column with a flow rate of 3BV / h, the temperature is 45°C, the HCl concentration of the treated effluent is about 5 mol / L, and the aluminum ion concentration is about 150 mg / L. Industrial concentrated hydrochloric acid can be added to increase the concentration of HCl to 8 mol / L before returning to the production process. It ...

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Abstract

The invention discloses a recycling method of waste hydrochloric acid containing aluminum and belongs to the technical field of recycling of waste acid containing aluminum. The method comprises the following steps of: (A) carrying out sand filtration on a waste hydrochloric acid washing liquid of an aluminum casting to remove suspended matters; (B) passing the waste hydrochloric acid washing liquid without the suspended matters through a fixed bed adsorption tower which is filled with strong-alkali anion exchange resin and provided with a heat insulation jacket under the conditions that the temperature is 5-45 DEG C and the work flow is 0.5-3.0BV / h; C) adding industrial hydrochloric acid in the processed effluent liquid so that the concentration of HCl is increased to 8mol / L, and then returning the effluent liquid back to a production process to be used as an aluminum casting hydrochloric acid washing liquid for circulating use; and D) passing distilled water or deionized water which is used as a regenerating agent through a resin bed to exchange and elute aluminum complex anions on a strong-alkali anion exchange resin, so as to form an aqueous solution containing aluminum trichloride, wherein the aqueous solution containing aluminum trichloride can be directly used as a purifying agent byproduct. According to the invention, the strong-alkali anion exchange resin is applied to the treatment and resource recovery of the waste hydrochloric acid washing liquid of the aluminum casting, thereby achieving the zero emission of the waste hydrochloric acid washing liquid of the aluminum casting and realizing the complete recycling of hydrochloric acid.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of aluminum-containing waste acid, in particular, to the waste hydrochloric pickling solution of aluminum and aluminum alloy castings in the production process of automobiles, household appliances, aviation, mechanical equipment, electroplating, metallurgy, etc., hydrochloric acid and aluminum Ion separation purification and recycling method. Background technique [0002] Aluminum and aluminum alloy castings are widely used as raw materials in industries such as automobiles, home appliances, aviation, mechanical equipment, electroplating, and metallurgy. These aluminum castings often need to be soaked and rinsed with concentrated hydrochloric acid before use. The HCl concentration of the waste hydrochloric acid washing solution is 4-8 mol / L, and the aluminum ion content is 1000-15000 mg / L. According to literature reports and engineering investigations, the treatment of waste hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56
Inventor 张炜铭吕路潘丙才俞冬辉
Owner 张炜铭
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