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Volume 10
Issue 6
10.3390/min10060508
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Article

Coke-Based Carbon Sorbent: Results of Gold Extraction in Laboratory and Pilot Tests

by
Svetlana Yefremova
1,*,
Alma Terlikbayeva
1,
Abdurassul Zharmenov
1,
Askhat Kablanbekov
1,
Lara Bunchuk
1,
Larissa Kushakova
2,
Viktor Shumskiy
2,
Yurij Sukharnikov
1 and
Sergey Yermishin
1
1
National Center on Complex Processing of Mineral Raw Materials of the Republic of Kazakhstan RSE, Almaty 050036, Kazakhstan
2
The Eastern Mining and Metallurgical Research Institute for Non-ferrous Metals “VNIITSVETMET”, Ust-Kamenogorsk 070002, Kazakhstan
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(6), 508; https://doi.org/10.3390/min10060508
Submission received: 28 April 2020 / Revised: 18 May 2020 / Accepted: 29 May 2020 / Published: 31 May 2020
(This article belongs to the Special Issue Mineral Sorbents)
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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.
Keywords: carbon sorbent; special coke fines; gold; adsorption; removal carbon sorbent; special coke fines; gold; adsorption; removal

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MDPI and ACS Style

Yefremova, S.; Terlikbayeva, A.; Zharmenov, A.; Kablanbekov, A.; Bunchuk, L.; Kushakova, L.; Shumskiy, V.; Sukharnikov, Y.; Yermishin, S. Coke-Based Carbon Sorbent: Results of Gold Extraction in Laboratory and Pilot Tests. Minerals 2020, 10, 508. https://doi.org/10.3390/min10060508

AMA Style

Yefremova S, Terlikbayeva A, Zharmenov A, Kablanbekov A, Bunchuk L, Kushakova L, Shumskiy V, Sukharnikov Y, Yermishin S. Coke-Based Carbon Sorbent: Results of Gold Extraction in Laboratory and Pilot Tests. Minerals. 2020; 10(6):508. https://doi.org/10.3390/min10060508

Chicago/Turabian Style

Yefremova, Svetlana, Alma Terlikbayeva, Abdurassul Zharmenov, Askhat Kablanbekov, Lara Bunchuk, Larissa Kushakova, Viktor Shumskiy, Yurij Sukharnikov, and Sergey Yermishin. 2020. "Coke-Based Carbon Sorbent: Results of Gold Extraction in Laboratory and Pilot Tests" Minerals 10, no. 6: 508. https://doi.org/10.3390/min10060508

APA Style

Yefremova, S., Terlikbayeva, A., Zharmenov, A., Kablanbekov, A., Bunchuk, L., Kushakova, L., Shumskiy, V., Sukharnikov, Y., & Yermishin, S. (2020). Coke-Based Carbon Sorbent: Results of Gold Extraction in Laboratory and Pilot Tests. Minerals, 10(6), 508. https://doi.org/10.3390/min10060508

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