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Method for treating spent catalyst noble metal recovery wastewater

A technology for precious metal recovery and spent catalysts, applied in chemical instruments and methods, filtration treatment, metallurgical wastewater treatment, etc., can solve problems such as silicon pollution, and achieve the effect of reducing the volume of wastewater and reducing the volume

Inactive Publication Date: 2020-08-18
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the present invention is to solve the serious silicon pollution problem in the process of membrane distillation treatment of waste catalyst precious metal recovery, by utilizing the morphological changes of coexisting metal ions in the waste water to absorb and co-precipitate silicon, and then through secondary filtration. Removing soluble silicon in wastewater, reducing membrane fouling during MD treatment of wastewater, and providing a treatment method for recycling wastewater from spent catalyst precious metals. The present invention provides a new solution for recycling waste water from spent catalyst precious metals and near-zero discharge

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  • Method for treating spent catalyst noble metal recovery wastewater
  • Method for treating spent catalyst noble metal recovery wastewater
  • Method for treating spent catalyst noble metal recovery wastewater

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Embodiment 1

[0039] Precious metal refining is to process and purify the impurity-containing and low-purity crude materials to obtain high-purity substances. Refining is one of the steps of purifying and recovering precious metals from spent catalysts. This case takes the treatment of actual spent catalyst platinum recovery and refining wastewater as an example to illustrate the features and advantages of the present invention.

[0040] The actual exhausted catalyst platinum recovery and refining wastewater produced by a precious metal resource recovery company is used as the research object, and its water quality indicators are shown in Table 1 below. The data in the table shows that the pH of refining wastewater is low and the salt content is high. Using conventional reverse osmosis or nanofiltration technology requires high operating pressure and is technically infeasible. Neutralize the sediment to reduce the content of high-valent metal ions in the wastewater. At the same time, the ge...

Embodiment 2

[0048] Silver is an important catalytic material and can be used as an active component of many oxidation reaction catalysts. Silver is an active component in the industrial production of ethylene oxide catalysts, and its mass content accounts for 15% to 40% of the catalyst. Therefore, rational use of limited resources and comprehensive recovery of secondary materials have attracted more and more attention. This case is based on the waste water produced by recycling silver from the spent catalyst as the research object. The water quality of the silver recovered from the spent catalyst is shown in Table 3. The characteristics and advantages of the present invention are illustrated by using MD to treat the waste water produced by silver recovery.

[0049] This embodiment takes the waste water produced by a precious metal resource recycling company to reclaim silver from the spent catalyst as the research object, and the water quality of the spent catalyst silver recovery is show...

Embodiment 3

[0054] Due to its good catalytic activity, platinum is widely used as an active component of catalytic materials in the fields of petrochemical, fine chemical, organic chemical, fuel cell and exhaust gas purification. The content of platinum in the spent catalyst is much higher than that of the original ore, and the energy consumption, environmental pollution and process complexity of the recovery process are all lower than that of the original ore mining. Due to the serious shortage of platinum resources, the comprehensive recycling of secondary resources of platinum metal has become an important source. In this case, the characteristics and advantages of the present invention are clarified by taking the treatment of the waste water recovered from the actual spent catalyst platinum as an example.

[0055] The source of the exhausted catalyst platinum recovery wastewater is a precious metal resource recovery company, and the water quality is as follows Figure 4 As shown, usi...

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Abstract

The invention relates to a method for treating spent catalyst precious metal recovery wastewater. The method comprises the following steps: treating wastewater with different pH values by adopting a membrane distillation process, hydroxide colloid is formed by utilizing the transformation of the form of coexisting metal ions in the wastewater; soluble silicon (SiO2) in wastewater is removed through mutual action of colloid with positive charges and silicate with negative charges in the wastewater, so that membrane pollution is reduced, high-quality hydrochloric acid HCl and low-conductivity high-quality wastewater can be obtained, and the volume of the wastewater can be greatly reduced. According to the method, resources can be recovered from the spent catalyst noble metal recovery wastewater, the wastewater volume can be greatly reduced, near-zero emission of the wastewater can be further realized, and strong acid or strong alkali high-salinity wastewater generated by spent catalyst noble metal recovery can be economically and effectively treated.

Description

technical field [0001] The invention belongs to the field of high-salt wastewater treatment, and in particular relates to a method for treating spent catalyst precious metal recovery wastewater. Background technique [0002] Noble metals such as platinum group metals (referred to as PGMs) elements include platinum (Pt), palladium (Pd), osmium (Os), iridium (Ir), ruthenium (Ru), rhodium (Rh), due to their superior catalytic properties, chemical inertness , anti-corrosion and thermoelectric stability and other properties, as the active component of the catalyst is widely used in the industrial field. PGMs are also known as "industrial vitamins". In different types of catalysts, the content of noble metals is between 0.2% and 100%. Precious metals are used in the largest amount in the field of electronics and catalysts, accounting for more than 90% of the total amount of precious metals. According to reports, 65% palladium, 45% platinum and 84% rhodium are used in catalytic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/16
CPCC02F1/001C02F1/08C02F1/66C02F9/00C02F2103/16
Inventor 陈刚黄满红徐雅倩梁巍瀚林燕莉
Owner DONGHUA UNIV
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