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Method for recovering platinum and rhenium from platinum-rhenium catalyst

A catalyst, platinum-rhenium technology, applied in the field of metallurgy, can solve the problems of limited recovery rate of platinum and rhenium, difficult separation of platinum and rhenium, low recovery rate of platinum and rhenium, etc., achieving simple and easy energy consumption, safe and controllable process , the effect of improving the leaching rate

Inactive Publication Date: 2018-07-13
XIAN RAREALLOYS
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] At present, there are two main methods for recovering platinum and rhenium from aluminum-based platinum-rhenium catalysts: one is to selectively dissolve platinum and rhenium. The advantage of this method is that the catalyst carrier can be reused, but the recovery of platinum and rhenium is relatively low. Second, the platinum, rhenium and alumina carriers are all dissolved first, and then separated and purified separately. This method has the disadvantages of difficult separation of platinum and rhenium and low dissolution efficiency
In the invention patent of authorized notification number CN100348749, alkaline solution is used to leach platinum and rhenium from spent catalyst, and then reduction and anion exchange resin and vulcanization treatment are used to recover platinum and rhenium respectively. The recovery rate of this invention is relatively high, but the process is complicated ; In the invention patent of authorized notification number CN102936658, the process of "leaching-roasting-acid leaching" is used to process platinum-rhenium catalyst. This process is simple and easy to control, but the recovery rate of platinum and rhenium is limited; -pressurized alkali dissolution-refining rhenium extraction-acid dissolution-refining platinum" comprehensively recovers platinum-rhenium reforming waste catalyst, but the process leach solution is difficult to filter, and platinum has a certain loss in the sulfuric acid leaching process; application publication number CN10726772A In the invention patent, the process route of "low-temperature roasting to remove carbon deposits-alkali leaching of rhenium-resin adsorption and recovery of rhenium-carrier full dissolution-R410 resin adsorption and recovery of platinum-adsorption tail liquid amine and alum method to recover aluminum" is adopted, but the process is cumbersome and difficult. control

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  • Method for recovering platinum and rhenium from platinum-rhenium catalyst

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Embodiment 1

[0022] Such as figure 1 As shown, this embodiment includes the following steps:

[0023] Step 1. Use the titanium basket and the titanium mesh as the anode and cathode of the electrolytic equipment respectively, and add 100g of platinum-rhenium catalyst into the anode titanium basket, and then add 1000mL of 5% sodium hydroxide solution into the electrolytic cell as the electrolyte , and then turn on the DC power supply to carry out the electrolysis reaction to obtain a slurry containing precipitation; the current density of the electrolysis reaction is 200A / m 2 , the cell voltage is 2V;

[0024] Step 2, putting the slurry obtained in step 1 into a flat-plate sedimentation centrifuge, and centrifuging at a speed of 2000r / min to obtain supernatant and precipitation;

[0025] Step 3, adjusting the pH of the supernatant obtained in step 2 to 1 with an acid, and then using D296 type anion exchange resin for selective adsorption to obtain an adsorbed liquid; the adsorbed liquid is...

Embodiment 2

[0030] Such as figure 1 As shown, this embodiment includes the following steps:

[0031] Step 1. Use the titanium basket and the titanium mesh as the anode and cathode of the electrolytic equipment respectively, and add 500g of platinum-rhenium catalyst into the anode titanium basket, and then add 5000mL of 15% sodium hydroxide solution into the electrolytic cell as the electrolyte , and then turn on the DC power supply to carry out the electrolytic reaction to obtain a slurry containing precipitation; the current density of the electrolytic reaction is 600A / m 2 , the tank voltage is 3.5V;

[0032] Step 2, putting the slurry obtained in step 1 into a flat-plate sedimentation centrifuge, and centrifuging at a speed of 2200r / min to obtain supernatant and precipitation;

[0033] Step 3, adjusting the pH of the supernatant obtained in step 2 to 2 with an acid, and then using D296 type anion exchange resin for selective adsorption to obtain an adsorbed liquid; the adsorbed liquid...

Embodiment 3

[0038] Such as figure 1 As shown, this embodiment includes the following steps:

[0039]Step 1, use the titanium basket and the titanium net as the anode and cathode of the electrolytic equipment respectively, and add 1000g of platinum-rhenium catalyst into the anode titanium basket, then add 15000mL of 25% sodium hydroxide solution in the electrolytic cell as the Electrolyte, then turn on the DC power supply, carry out the electrolysis reaction, and obtain the slurry containing the precipitate; the current density of the electrolysis reaction is 1000A / m 2 , the cell voltage is 5V;

[0040] Step 2, putting the slurry obtained in step 1 into a flat-plate sedimentation centrifuge, and centrifuging at a speed of 2500r / min to obtain supernatant and precipitation;

[0041] Step 3, adjusting the pH of the supernatant obtained in step 2 to 4 with an acid, and then using D296 type anion exchange resin for selective adsorption to obtain an adsorbed liquid; the adsorbed liquid is used...

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Abstract

The invention discloses a method for recovering platinum and rhenium from a platinum-rhenium catalyst. The method comprises the following steps of 1, carrying out electrodissolution reaction on the platinum-rhenium catalyst so as to obtain slurry; 2, centrifuging the slurry so as to obtain supernatant and precipitates; 3, adjusting the pH value of the supernatant to be 1-4 and then carrying out adsorption with resin; 4, after mixing ammonia water and an ammonium chloride solution, carrying out desorption on the resin subjected to absorption and carrying out evaporation and concentration on anobtained desorption solution so as to obtain ammonium rhenate; and 5, leaching the precipitates by using aqua regia, carrying out centrifuging to obtain supernatant, obtaining platinum-contained precipitates from the supernatant by adopting an ammonium chloride precipitation method and then carrying out hydrazine hydrate reduction so as to obtain platinum powder. The method has the advantages thatthe rhenium in the platinum-rhenium catalyst is selectively dissolved through electrochemical action, so that the rhenium and the platinum are separated and then are recovered separately through an ion exchange method and an aqua regia dissolution-ammonium chloride precipitation method, and therefore the separation efficiency of the rhenium and the platinum can be improved, and the quality and the recovery rate of obtained products are relatively high.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for recovering platinum and rhenium from a platinum-rhenium catalyst. Background technique [0002] Platinum (chemical symbol Pt) is commonly known as platinum and belongs to the platinum group elements. It is insoluble in any acid and alkali except aqua regia. It has high chemical stability and catalytic activity. It can be combined with cobalt to make strong magnets for corrosion resistance. Chemical instruments, catalysts in chemical reactions, and anticancer drugs in medicine. Rhenium (symbol Re) is a transition element with high melting and boiling points that is used to make superalloy components for jet engines or to make platinum-rhenium catalysts for the production of unleaded, high-octane gasoline. The carrier of the platinum-rhenium catalyst is alumina with a large surface area, which is easily deactivated during use, resulting in waste catalys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B61/00C22B11/00C25B1/00
CPCC22B7/007C22B7/009C22B11/048C22B61/00C25B1/00Y02P10/20
Inventor 郭瑞李进周严王靖坤
Owner XIAN RAREALLOYS
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