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Strength and Adsorption ability of activated carbon (8 replies and 1 comment)
To do a physical test, there is what is called attrition test. What you can do in a large scale, is to sample your virgin carbon then introduce it in a tank filled up with water. The tank should be having a pump (a pump similar to the ones used to transfer carbon in your plant). Afterwards, start the pump and transfer your carbon. Ensure that you also sample the carbon transferred. Do a PSD (particle size distribution) of the two samples and compare the results. You will be able to determine how robust your carbon is per transfer circle. The other physical test in a lab is to agitate it with the impeller of the same material used in the large scale in relation to the residence time that your carbon would spend in the tank. By that, you will be able to know the effect of the impellers towards your carbon.
Adsorption test: Prepare a 5mg/L gold solution in a beaker using potassium cyanide or sodium cyanide. Introduce a measured quantity of virgin carbon in that solution (e.g 2g/L). Put in a magnetic stirrer and run the test for 24hrs. After the completion time, analyse the solution and by difference to the initial 5mg/L, you will be able to know how much was adsorbed.
That will actually depend on the quantity of carbon that you use in relation to gold concentration in solution. If you use a small quantity of carbon on a high concentrated solution, your carbon will reach saturation state. So by doing a test work that's when you will be able to determine how much carbon can extract in terms of percentage since the suppliers differ. What you can do is to keep your gold concentration constant and vary your carbon concentration during your test work, and once you get a flat line on your graph (Au (mg/l) vs carbon concentration (g/l), then you'll know the limit your carbon can take.
Use virgin carbon for the test work.
You might find the appended doc, from ~25-years ago, of value in your testing...sorry, had to convert old WP file to pdf...
Wonderful Procedure & Method for Activated Carbon Testing Mr. Bhaduri. Thank you for this.
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Is there any test procedures to know the physical strength and adsorption ability of activated carbon for CIL application.