How can we use eco-friendly gold leaching reagent?

Eco-friendly gold leaching reagents are increasingly being adopted as a safer and more sustainable alternative to traditional sodium cyanide in gold extraction processes. Here’s a comprehensive guide on how to use these reagents effectively.

Step-by-Step Method for Using Eco-Friendly Gold Leaching Reagents

Adjust Solution Alkalinity:
Begin by adjusting the aqueous solution and pulp solution to be alkaline.
Ensure the pH of the solution is between 10-11.

Maintain Alkalinity:
Throughout the leaching process, maintain the alkalinity of the pulp at pH 10-11.

Add Gold Recovery Reagents:
Introduce the gold recovery reagents.
Keep the concentration of the gold extracting agent in the pulp or aqueous solution between 10-15/10,000 during the entire leaching process.

Concentration Detection Method
To ensure the correct concentration of the leaching agent, follow these steps:

Sample Preparation:
Use a 10ml pipette to extract 10ml of the liquid to be tested (filter out mud and impurities first).
Place the sample into a conical flask.

Add Color Developer:
Add 2-5 drops (about 0.1ml) of color developer to the conical flask.
The liquid will turn light yellow.

Titration:
Use an acid burette to add the test agent into the conical flask slowly.
Shake the flask while titrating and observe the color change under natural light.
The endpoint is reached when the liquid changes from light yellow to light red.

Determine Concentration:
The amount of test agent used (in ml) indicates the concentration in ten-thousands of the test solution.
For example, if 0.7ml is used, the concentration is 0.7/10,000 (0.07%).

Adjust Concentration:
If the concentration is below the required 10-15 per ten thousand, add more reagent.
Preparation of Test Environmental Type Leaching Agent

Silver Nitrate Solution:
Dissolve 1.7331g of silver nitrate in distilled water to make up a volume of 1000 ml.
Store in a brown volumetric flask in a cool, dark place.

Reagent Solution:
Dissolve 0.02-0.05 grams of p-dimethylaminobianyl rhodanine in 100ml of acetone.
Store in a brown reagent bottle away from light.
Required Instruments and Reagents
50ml beaker
10ml pot-bellied pipette
Alkaline burette
Dropper with rubber head
Test reagent
Color developer
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