Enhanced efficiency of diamond foam separation after complex removal of hydrophilic slime coats from diamond surface

The X-ray microanalysis and IR spectroscopy applied jointly show that unstructured hydrophilic impurities on the surface of diamonds are composed by a cryptoand microcrystalline material of carbonate and aluminosilicate composition and containing chlorite, phlogopite, apatite, iron hydroxides and calcium sulfates. Based on the comparative analysis of slime coats sampled from the surface of diamonds and sludge underflows after recycling water clarification, it is proposed to remove all hydrophilic coats from the surface of diamond crystals using jointly the methods of ultrasonic, thermal and reagent treatment of ore pulp. Experiments have proved efficiency of joint application of the ultrasonic, thermal and reagent treatment methods to remove detected hydrophilic coats from the surface of diamonds. Lab-scale tests show that the joint use of these methods ensures increase in diamond extraction to non-frothing flotation concentrate by 25.0–27.1%. Benchmark testing finds out that the joint use of ultrasonic attrition for 30 seconds and heating of ore pulp up to 85 °C with a dispensing agent (oxyethylidenediphosphonic acid) at concentration of 100 mg/l ensures increment in extraction of diamonds to froth flotation concentrate by 10%.

Keywords: diamonds, kimberlite, slime, froth flotation, thermal treatment, ultrasonic treatment, reagents.
For citation:

Dvoichenkova G. P., Kovalenko E. G., Timofeev A. S., Podkamennyi Yu. A. Enhanced efficiency of diamond foam separation after complex removal of hydrophilic slime coats from diamond surface. MIAB. Mining Inf. Anal. Bull. 2022;(10):20-38. [In Russ]. DOI: 10.25018/0236_1493_2022_10_0_20.

Issue number: 10
Year: 2022
Page number: 20-38
ISBN: 0236-1493
UDK: 622.765.4
DOI: 10.25018/0236_1493_2022_10_0_20
Article receipt date: 18.08.2022
Date of review receipt: 05.09.2022
Date of the editorial board′s decision on the article′s publishing: 10.09.2022
About authors:

G.P. Dvoychenkova1,2, Dr. Sci. (Eng.), Assistant Professor, Chief Researcher, ICEMR RAS; Professor, Polytechnic Institute (branch) of NEFU, e-mail: dvoigp@mail.ru, ORCID ID: 0000-0002-0940-3880,
E.G. Kovalenko2, Cand. Sci. (Eng.), Chief Engineer, Institute «Yakutniproalmaz» JSC «ALROSA» (Public Joint Stock Company), 678174, Mirny, Republic of Sakha (Yakutia), Russia; Assistant Professor, Polytechnic Institute (branch) of NEFU, e-mail: kovalenkoeg@alrosa.ru,
A.S. Timofeev1, Cand. Sci. (Eng.), Senior Researcher, e-mail: Timofeev_ac@mail.ru, ORCID ID: 0000-0002-3382-6007,
Yu.A. Podkamenny1,2, Cand. Sci. (Eng.), Researcher, ICEMR RAS; Lecturer, Polytechnic Institute (branch) of NEFU, e-mail: mirniy.yuriy@mail.ru, ORCID ID: 0000-0002-4104-9113,
1 Institute of Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, 111020, Moscow, Russia,
2 Polytechnic Institute (branch) of M.K. Ammosov North-Eastern Federal University, 678170, Mirny, Republic of Sakha (Yakutia), Russia.


For contacts:

A.S. Timofeev, e-mail: Timofeev_ac@mail.ru.


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