Abstract
Coke-based carbon sorbent (CBCS) was produced using special coke fines with the following characteristics: ash, 4.5%; iodine adsorption capacity, 52%; specific surface area, 600 m2 g−1; and total pore volume, 0.4 cm3 g−1. Gold adsorption from real production cyanide solutions in batch and column laboratory experiments was studied. The optimum adsorbent/solution ratio was 0.2 g/20 cm3. Sorption equilibrium occurred after 60 min of phase-time contact. The CBCS maximum adsorption capacity for gold was found to be 1.2 mg g−1. Both the Langmiur and Freundlich isotherm models confirmed that gold adsorption by CBCS proceeds favorably, but the Freundlich isotherm best describes the adsorption equilibrium. The CBCS dynamic exchange capacity (100 g t−1) and full dynamic exchange capacity (4600 g t−1) for gold were determined in column tests. It was revealed using SEM that adsorbate was retained in sorbent pores. The possibility of completely eluting gold from CBCS was demonstrated. A CBCS pilot test to recover gold from 200 dm3 of the cyanide solution containing (mg dm−3) 2.6 Au, 0.42 Ag, and 490 Cu was carried out. The total amount of noble metals (Au + Ag) adsorbed was 99.99% and gold ions was 94%. The CBCS maximum adsorption capacity for gold reached 2900 g t−1.
Highlights
Research into the processing of gold ores has been relevant for more than 100 years
We reported in previous papers the results of studies of coke-based carbon sorbent production possibilities [40,41]
A carbon sorbent based on special coke fines, having a low ash content and developed pore system, was produced
Summary
Research into the processing of gold ores has been relevant for more than 100 years. Due to the fact that the Republic of Kazakhstan is one of the gold mining countries in the world this problem is interesting for local scientists and researchers [28]. The. National Center on Complex Processing of Mineral Raw Materials of the Republic of Kazakhstan RSE and its branches are Kazakhstani leaders in the creation of gold-containing raw-materials-processing technologies and the equipment to realize these processes. Cyanidation is known to be a common commercial method of gold leaching, despite being criticized in recent years because of its environmental pollution. There are new scientific approaches to increase the efficiency of processing of refractory gold ores containing copper, “preg-robbing” carbon, arsenic compounds, and gold
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
