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Method for removing palladium from silver electrolyte by using multifunctional silica gel adsorbent

A silica gel adsorption and multi-functional technology, applied in the direction of electrolysis process, electrolysis components, process efficiency improvement, etc., can solve the problem of increasing Ag separation process, etc., and achieve the effect of low cost, simple operation and efficient recovery

Pending Publication Date: 2021-07-13
苏州硒诺唯新新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can effectively realize the separation of palladium and silver. After the adsorption, the solution can be directly returned to the silver electrolysis, but the analysis solution uses acidic thiourea and high-concentration hydrochloric acid, which requires secondary analysis to complete the analysis, and the adsorption rate of silver is >5 %, the content of Ag in the precious metal Pd in ​​the analysis solution is more than that of Pd, so that the recovery of the precious metal Pd increases the Ag separation process

Method used

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  • Method for removing palladium from silver electrolyte by using multifunctional silica gel adsorbent
  • Method for removing palladium from silver electrolyte by using multifunctional silica gel adsorbent
  • Method for removing palladium from silver electrolyte by using multifunctional silica gel adsorbent

Examples

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Effect test

Embodiment 1

[0034] Example 1 Method for removing palladium from the silver electrolyte by multi-function silica adsorbent, including steps:

[0035] 1) Preparation of multifunctional silica gel adsorbents

[0036] Tetrate-free pentamine (13.68 kg, 72 mol) is added to 100 L reactor (CH 3 O) 3 Si (CH) 2 ) 3 After CL (48 mol) was stirred at 120 ° C for 6 hours, it was cooled to 60 ° C, and then ethanol (10L) was refluxed for 2 hours until the liquid became transparent, and the cooling was transferred to a 200l reaction kettle, and xylene (80.0L) and Silica gel (32.0kg, 37-500 μm, ), Place the oil bath cope at 150 ° C, when the oil bath temperature reaches the set value and begins to collect ethanol, the entire process lasts for 3 hours. The liquid removal was removed, the solids (100 L) were stirred after 30min, and more water (100 L) was added to the solid, stirring the mixture for 30 min and filtered, dried to the silica gel adsorbent; multifunctional silica gel adsorbent The chemical formula...

Embodiment 2

[0050] Example 2 Methods of removing palladium from the silver electrolyte by multi-function silica adsorbent, including steps:

[0051] 1) Preparation of multifunctional silica gel adsorbents

[0052] Diethylene triamine (7.49 kg, 72 mol) and (CH) were added to 100 L reactor 3 O) 3 Si (CH) 2 ) 3 After CL (48 mol) was stirred at 160 ° C for 8 hours, it was cooled to 60 ° C, and then ethanol (10L) was refluxed to flow until the liquid became transparent, cooled into 200L reactor, and pell xylene (80.0L) and Silica gel (32.0kg, 37-500 μm, ), Place the oil bath cope at 150 ° C, when the oil bath temperature reaches the set value and begins to collect ethanol, the entire process lasts for 3 hours. The liquid removal was removed, and the solid was stirred for 30 min and then filtered, and more water (100 L) was added to the solid, stir filtered after 30min, dried, and the polyfunctional silica gel absorbent. Chemical formation [(O 3 / 2 ) Si (CH 2 ) x NH (CH) 2 CH 2 NH) y H] a [Si (O " ...

Embodiment 3

[0064] Example 3 Methods of removing palladium from the silver electrolyte by multi-function silica gel adsorbent, including steps:

[0065] 1) Preparation of multifunctional silica gel adsorbents

[0066] Polyethylene polyamine (27.36 kg, 72 mol) is added to 100 L reactor (CH) 3 O) 3 Si (CH) 2 ) 3 After CL (48 mol) was stirred at 160 ° C for 8 hours, it was cooled to 60 ° C, and then ethanol (10L) was refluxed to flow until the liquid became transparent, cooled into 200L reactor, and pell xylene (80.0L) and Silica gel (32.0kg, 37-500 μm, ), Place the oil bath cope at 150 ° C, when the oil bath temperature reaches the set value and begins to collect ethanol, the entire process lasts for 3 hours. The liquid removal was removed, and the solid was stirred for 30 min and then filtered, and more water (100 L) was added to the solid, stir filtered after 30min, dried, and the polyfunctional silica gel absorbent. Chemical formation [(O 3 / 2 ) Si (CH 2 ) x NH (CH) 2 CH 2 NH) y H] a [Si (O ...

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Abstract

The invention relates to the technical field of separation of precious metal in solutions, in particular to a method for removing palladium from a silver electrolyte by using a multifunctional silica gel adsorbent. The method comprises following steps that (1) the multifunctional silica gel adsorbent is obtained; (2) adsorption is carried out, wherein the multifunctional silica gel adsorbent is added into the silver electrolyte to carry out stirring adsorption treatment, components of the silver electrolyte comprise 25 g / L-250 g / L of silver, 0.005 g / L-1 g / L of palladium, 0 g / L-40 g / L of copper and 1 g / L-15 g / L of nitric acid, and the addition amount of the multifunctional silica gel adsorbent is 0.5 g / L-100 g / L; (3) analyzing is carried out; and (4) regenerating is carried out. According to the method for removing palladium from the silver electrolyte by using the multifunctional silica gel adsorbent, efficient selective adsorption of palladium can be achieved, and in the silver electrolyte with the silver content being 25 g / L-250 g / L and the palladium content being 0.005 g / L-1 g / L, the adsorption rate of palladium reaches 99% or above, and the adsorption rate of silver is 0%.

Description

Technical field [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the separation of precious metals in a solution, and more particularly to a method of removing palladium from a silver electrolyte by multifunctional silica adsorbent. Background technique [0002] Silver refining mainly used electrolytic refining method, and its electrolyte is a silver nitrate solution. As the electrolytic refining is carried out, the metal in the anode plate will constantly dissolve, resulting in PD 2+ Cu 2+ , BI 3+ Plasma accumulates in the silver electrolyte. After several cycles of the electrolytic solution, the metal in the electrolyte continues to rise, easy to be reduced as a metal, precipitated on the cathode, thereby affecting the quality of the silver product, wherein the palladium is similar to the silver reduction potential. The main impurities of the product quality, therefore is necessary to purify palm in the silver electrolyte. [0003] M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C25C1/20C25C7/06
CPCC22B7/005C22B11/04C25C1/20C25C7/06Y02P10/20
Inventor 杨南超杨晓伟赵勤
Owner 苏州硒诺唯新新材料科技有限公司
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