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Functionalized mesoporous molecular sieve and application of functionalized mesoporous molecular sieve in recovering noble metal

A mesoporous molecular sieve and molecular sieve technology, applied in other chemical processes, chemical instruments and methods, water/sludge/sewage treatment, etc., to achieve simple process and high adsorption efficiency

Inactive Publication Date: 2013-11-13
ZHEJIANG LANBO METAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these molecular sieves have no adsorption effect on noble metal ions in aqueous solution.

Method used

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  • Functionalized mesoporous molecular sieve and application of functionalized mesoporous molecular sieve in recovering noble metal
  • Functionalized mesoporous molecular sieve and application of functionalized mesoporous molecular sieve in recovering noble metal
  • Functionalized mesoporous molecular sieve and application of functionalized mesoporous molecular sieve in recovering noble metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Grafting of functional groups

[0029] 2.5g MCM-41 powder is put into containing 0.1mol / L amino propane (C 3 h 7 NH 2 ) in 250 ml of anhydrous toluene, reflux at 120°C for 18 hours, and graft functional groups-NH on molecular sieves 2 , then filter the MCM-41 powder, and dry the powder at 110 °C for 12 hours to evaporate the complete toluene to give NH 2 -MCM-41 selectively adsorbs noble metal functional molecular sieves. Using the same method to graft the functional group -SH, the SH-MCM-41 selective adsorption noble metal functional molecular sieve was obtained. Produced NH 2 The physical and chemical properties of -MCM-41 and SH-MCM-41 are shown in Table 1.

[0030] 2. Selective adsorption and desorption of precious metals

[0031] 50g NH 2 -MCM-41 selectively adsorbs precious metal functional molecular sieves into 2.5 liters containing 276g of gold chloride (AuCl 3 ) and 59g palladium chloride (PdCl 3 ) solution, the pH value of the solution was adjuste...

Embodiment 2

[0037] Example 2: Using SBA-15 molecular sieve to graft functional groups and its application in separating gold and platinum

[0038] 1. Grafting of functional groups

[0039] 2.5g SBA-15 powder is put into containing 0.1mol / L amino propane (C 3 h 7 NH 2 ) in 250 ml of anhydrous toluene, reflux at 120°C for 18 hours, and graft functional groups-NH on molecular sieves 2 , and then filter the SBA-15 powder, and dry the powder at 110 °C for 12 hours to evaporate the complete toluene to give NH 2 -SBA-15 selective adsorption of noble metal functional molecular sieves.

[0040] 2. Selective adsorption and separation of gold and platinum

[0041] 25g NH 2 -SBA-15 selectively adsorbs precious metal functional molecular sieves into 2 liters containing 76g of gold chloride (AuCl 3 ) and 24g platinum chloride (PtCl 3 ) solution, the pH value of the solution was adjusted to 1.0, and the functional molecular sieve loaded with gold and platinum ions was filtered out after stirring...

Embodiment 3

[0046] Selective adsorption of precious metal functional molecular sieves for recovery of precious metals from waste electronic circuit boards. Discarded mobile phone electronic circuit boards are pulverized, superfinely pulverized and separated by high-voltage electrostatics, and the obtained metal powder is dissolved in concentrated hydrochloric acid:concentrated nitric acid with a volume ratio of 1:2 to obtain a solution containing metal ions. The solution contains 0.015mol of gold; 0.009mol of platinum; 0.47mol of copper; 0.21mol of tin; 0.077mol of lead; 0.27mol of iron; Use sodium hydroxide solution to adjust the pH value of the solution to about 1.0, put 5g SH-MCM-41 molecular sieve into the metal solution, and stir at room temperature for 12 hours to allow the molecular sieve to fully absorb noble metal ions. After filtering the solution, molecular sieves loaded with precious metal ions and a solution containing unadsorbed metals are obtained.

[0047] The precious me...

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Abstract

The invention discloses a functionalized mesoporous molecular sieve and application of the functionalized mesoporous molecular sieve in recovering noble metal. The functionalized mesoporous molecular sieve is a silicon mesoporous molecular sieve grafted with amido or sulfydryl. The application of the functionalized mesoporous molecular sieve in recovering the noble metal comprises the following steps: processing a waste electronic circuit board to obtain metal dissolving solution; regulating the pH of the metal dissolving solution to about 1, and selectively absorbing palladium ions and / or platinum ions in the metal dissolving solution by using the functionalized mesoporous molecular sieve; regulating the pH of the metal dissolving solution to about 2.5, and selectively absorbing aurum ions in the metal dissolving solution by using the functionalized mesoporous molecular sieve; and respectively washing the molecular sieve carried with palladium ions and / or molecular sieve carried with platinum ions and the molecular sieve carried with aurum ions, thereby enabling the noble metal to enter the solution through desorption and simultaneously reactivating the molecular sieve. The method for recovering the noble metal has the advantages of simple process and high noble metal absorption rate, and is environment-friendly.

Description

1. Technical field: [0001] The invention specifically relates to a mesoporous molecular sieve grafted with functional group amino or mercapto and its application in recovering precious metals such as gold, palladium, platinum and the like from waste electronic circuit boards. 3. Background technology: [0002] According to relevant statistical data, the discarded electronic circuit boards contain quite high metals, generally 20-40%, especially precious metals, which are dozens or even hundreds of times that of natural mineral deposits. It contains 3-8% gold, 0.1-1% platinum and palladium, and of course copper, tin, aluminum, nickel, lead and other metals with varying contents. Judging from the content of precious metals such as gold, platinum and palladium, the recovery of precious metals from waste electronic circuit boards has great economic benefits. The key to the recovery is how to separate and enrich precious metals from other metals. [0003] Common molecular sieves...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18B01J20/30C02F1/28C02F1/62
Inventor 郑华均
Owner ZHEJIANG LANBO METAL TECH
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