Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for extracting gold and palladium from silver anode slime

A technology for silver anode slime and extraction, which is applied in directions such as process efficiency improvement, can solve problems such as comprehensive recovery of unfavorable palladium products, high palladium content, low yield and the like, and achieves saving reagent costs, reducing iron content and high product yield. Effect

Inactive Publication Date: 2015-04-01
JINCHUAN GROUP LIMITED
View PDF2 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method firstly uses the traditional primary reducing agent, which will affect the primary reduction rate and product quality of gold, and secondly, the palladium content in the solution after the primary reduction is very high, and part of the palladium has not been extracted in the closed circuit, which affects the gold product. The quality and direct recovery rate are not conducive to the comprehensive recovery of palladium products. After the first reduction, the liquid needs to be reduced by sodium bisulfite twice to recover the gold in it. The second reduction gold powder needs to return to the gold chlorination process due to the high content of impurities. , long process, low yield, high cost

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for extracting gold and palladium from silver anode slime

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Calculate the amount of HCl, slowly add it into the container containing the reduced solution of sodium bisulfite, adjust the concentration of hydrogen ions in the feed liquid to 1.5mol / L, carry out four-stage gold extraction at room temperature, DBC and feed liquid The volume ratio is 3:1. Stir for 10 minutes and then stand still. Mix and clarify for 5 minutes. Then use HCl with a concentration of 0.5 mol / L to wash the gold-loaded organic phase in four stages at room temperature. The volume ratio (O / A)=1, and finally use Oxalic acid is used for stripping the gold-loaded organic phase, the amount of oxalic acid is 3 times of the theoretical amount, and the reduction temperature is 81°C to obtain qualified gold powder. The raffinate is based on the traditional palladium extraction process, and the final generated dichlorodiamine palladium palladium is adjusted to an appropriate acidity of PH=5, and the palladium product is obtained by reducing it with hydrazine hydrate at...

Embodiment 2

[0027] Calculate the amount of HCl, slowly add it into the container containing the reduced solution of sodium bisulfite, adjust the concentration of hydrogen ions in the feed liquid to 3mol / L, carry out four-stage gold extraction at room temperature, DBC and feed liquid volume The ratio is 2:1. Stir for 15 minutes and then stand still. Mix and clarify for 4 minutes. Then use 0.5 mol / L HCl to wash the loaded organic phase in four stages at room temperature. The volume ratio (O / A)=2. Phase back extraction, the amount of oxalic acid is 3.5 times the theoretical amount, the reduction temperature is 85 ° C, to obtain qualified gold powder. The raffinate is based on the traditional palladium extraction process, and the final generated dichlorodiamine complex palladium is adjusted to an appropriate acidity of PH=6, and the palladium product is obtained by reducing it with hydrazine hydrate at an appropriate acidity. The direct recovery rate of gold is 99.51%, the direct recovery rat...

Embodiment 3

[0029] Calculate the amount of HCl, slowly add it into the container containing the reduced solution of sodium bisulfite, adjust the concentration of hydrogen ions in the feed liquid to 4mol / L, carry out four-stage gold extraction at room temperature, DBC and feed liquid volume The ratio is 1:1. Stir for 20 minutes and then stand still. Mix and clarify for 3 minutes. Then use 0.5 mol / L HCl to wash the loaded organic phase in four stages at room temperature. The volume ratio (O / A)=1. Phase back extraction, the amount of oxalic acid is 4 times of the theoretical amount, the reduction temperature is 85 ℃, and qualified gold powder is obtained. The raffinate is based on the traditional palladium extraction process, and the final generated dichlorodiamine complex palladium is adjusted to an appropriate acidity of PH=6, and the palladium product is obtained by reducing it with hydrazine hydrate at an appropriate acidity. The direct recovery rate of gold is 99.51%, the direct recover...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for extracting gold and palladium from silver anode slime. Extraction of gold and palladium from complicated and difficult-to-treat silver anode slime is optimized. The method comprises the following steps: firstly, chloridizing the silver anode slime with controlled voltage, adding NaHSO3 to a chloride solution for reducing, and further purifying the obtained crude gold powder; and extracting gold and palladium from a liquid after once gold reduction of sodium hydrogen sulfite. The method comprises the following specific technological processes: extracting gold from the liquid after once gold reduction of sodium hydrogen sulfite by adopting DBC; separating out gold-loaded organic phase and an extract liquid; washing the gold-loaded organic phase with HCl, then carrying out reverse extraction with oxalic acid to obtain gold powder, and determining the optimal technological condition; and reducing the extract liquid with hydrazine hydrate to obtain a palladium product, and determining the optimal technological condition. The direct recovery rate of gold in the overall process is over 99%; the direct recovery rate of palladium is over 94%; the quality of the gold powder can reach the requirement of 99.99% type product in GB / T 4134-2003; and the palladium product can reach the quality requirements of 99.99% grade in GB / T 1419-2004.

Description

technical field [0001] A method for extracting gold and palladium from silver anode slime of the present invention relates to the field of metallurgical technology, can be used for various precious metal concentrates and secondary resources rich in gold, silver and palladium, and can also be used for precious metal residues Separate the extracted fields. Background technique [0002] Silver anode slime is the end product of copper anode slime treatment. In recent years, due to the continuous increase of purchased raw materials, silver anode slime is rich in platinum, palladium and gold. The traditional silver anode slime is mostly divided into gold chlorination-reduction-coarse gold powder-boiling and washing-casting anode-gold electrolysis-gold powder, or the secondary electrolysis method is used to extract gold, and then the chemical precipitation method is used to extract gold from the gold reduction solution or gold electrolysis waste Recovery of platinum and palladium ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C22B11/00C22B7/00
CPCY02P10/20
Inventor 马玉天张发志冯岩潘从明陈云峰李明王立刘发存
Owner JINCHUAN GROUP LIMITED