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Method for recovering precious metal from waste aluminum-based catalyst and preparing high-purity alumina

A high-purity alumina and catalyst technology, applied in the direction of improving process efficiency, can solve problems such as long process flow, and achieve the effects of simple process operation, high added value of products, and easy scale

Inactive Publication Date: 2012-07-11
KUNMING INST OF PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is long and has strict requirements on the temperature of the roasting process, and does not involve the recovery of precious metals

Method used

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  • Method for recovering precious metal from waste aluminum-based catalyst and preparing high-purity alumina
  • Method for recovering precious metal from waste aluminum-based catalyst and preparing high-purity alumina

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Embodiment 1, see attached figure 1 , take by weighing 100g waste aluminum-based catalyst (containing Pt 0.3%, finely ground) and 130g ammonium sulfate, fully mix, roast 2h at 300 ℃, roast product with dilute sulfuric acid (volume concentration 1mol / L) according to liquid-solid ratio 5: 1 (w / v) boiling leaching for 2h, after solid-liquid separation, the dealuminated slag adopts 6mol / L hydrochloric acid+hydrogen peroxide to dissolve 4h at 80 DEG C to reclaim platinum, and the Pt recovery rate is greater than 99%; Add ammoniacal liquor (mass Concentration 28%) to adjust the pH to 2, stir for a certain period of time, precipitate aluminum ammonium sulfate coarse crystals, repeat the recrystallization process 3 times, the obtained high-purity aluminum ammonium sulfate crystals were calcined at 1200 ° C for 5 hours, and high-purity alumina powder was obtained. Greater than 99.98%, the recovery rate is greater than 92%.

Embodiment 2

[0016] Embodiment 2, see attached figure 1 , Weigh 100g of waste aluminum-based catalyst (containing 0.3% of Pt) and 130g of ammonium sulfate, mix well, and roast at 400°C for 2h, and the roasted product is mixed with dilute sulfuric acid (1mol / L) at a liquid-solid ratio of 5:1 (w / v ) boiling leaching for 2 hours, after solid-liquid separation, the dealuminated slag was dissolved in 6mol / L hydrochloric acid+hydrogen peroxide at 80°C for 4 hours to recover platinum, and the recovery rate of Pt was greater than 99%; The pH is 2, stirred for a certain period of time, coarse crystals of ammonium aluminum sulfate are precipitated, and the recrystallization process is repeated 3 times. The obtained high-purity ammonium aluminum sulfate crystals are calcined at 1200°C for 5 hours to obtain high-purity alumina powder with a purity greater than 99.99%. The rate is greater than 92%.

Embodiment 3

[0017] Embodiment 3, see attached figure 1 , Weigh 100g of waste aluminum-based catalyst (containing 0.3% of Pt) and 150g of ammonium sulfate, mix well, and roast at 400°C for 4h, and the roasted product is mixed with dilute sulfuric acid (1mol / L) at a liquid-solid ratio of 5:1 (w / v ) boiling leaching for 2 hours, after solid-liquid separation, the dealuminated slag was dissolved in 6mol / L hydrochloric acid+hydrogen peroxide at 80°C for 4 hours to recover platinum, and the recovery rate of Pt was greater than 99%; The pH is 2, stirred for a certain period of time, coarse crystals of ammonium aluminum sulfate are precipitated, and the recrystallization process is repeated 3 times. The obtained high-purity ammonium aluminum sulfate crystals are calcined at 1200°C for 5 hours to obtain high-purity alumina powder with a purity greater than 99.99%. The rate is greater than 94%.

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Abstract

The invention discloses a method for recovering precious metal from a waste aluminum-based catalyst and preparing high-purity alumina. The method mainly comprises the processes of: roasting, leaching to remove aluminum by using dilute sulfuric acid, recovering the precious metal from slag from which the aluminum is removed by an aqueous solution chlorination method, adding ammonia water into leachate to precipitate an ammonium aluminum sulfate coarse crystal, recrystallizing, and calcining and decomposing to prepare the high-purity alumina. The method specifically comprises the following steps of: mixing the finely ground waste aluminum-based catalyst (40mu m) and ammonium sulfate in a weight ratio of 1:(1.3-1.5), roasting at the temperature of between 300 and 500 DEG C for 2 to 4 hours, performing fluidization leaching on a roasting product by using 1mol / L dilute sulfuric acid for 2 hours, performing solid-liquid separation, and recovering the precious metal from the slag from which the aluminum is removed by the traditional aqueous solution chlorination method, wherein the recovery rate of the precious metal is over 99 percent; and adding the ammonia water into the leachate to regulate the pH value and precipitate the ammonium aluminum sulfate coarse crystal, recrystallizing, and calcining and decomposing to prepare the high-purity alumina, wherein the purity is over 99.99 percent, and the recovery rate is over 95 percent. The invention has the advantages that: the process is reasonable, the method is easy to operate, the added value of a product is high, pollution is light, mass production is convenient to implement, and the like.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgy, and relates to a method for recovering precious metals from waste aluminum-based catalysts and preparing high-purity alumina. Background technique [0002] Noble metal catalysts are composed of substrates and noble metal active parts, and are widely used in the petrochemical industry. At present, the catalysts used in industry are mainly noble metal catalysts with alumina as the carrier. During use, the catalytic activity of noble metals will be weakened so that they lose their activity and become spent catalysts. However, the state of noble metal components remains unchanged. Aluminum etc. have great economic value. In addition to recycling precious metals, it can also be used to produce high-purity alumina. Precious metal resources are scarce, and spent precious metal catalysts have become one of the important secondary resources of precious metals. At present, the methods for recovering...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/06C22B3/08C22B11/00C22B21/00
CPCY02P10/20
Inventor 董海刚陈家林范兴祥赵家春周利民吴跃东童伟锋李博捷吴晓峰
Owner KUNMING INST OF PRECIOUS METALS
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