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PROCESSING AND COMPLEX USAGE OF MINERAL RAW MATERIALS
ArticleName Resource-saving in processing of phyllosilicate minerals
DOI 10.17580/gzh.2018.12.11
ArticleAuthor Arsentiev V. A., Gerasimov A. M., Ustinov I. D.
ArticleAuthorData

Mekhanobr-tekhnika Research and Production Company, Saint-Petersburg, Russia:

V. A. Arsentiev, Director of Development and Research, Doctor of Engineering Sciences, ava@npk-mt.spb.ru
A. M. Gerasimov, Senior Researcher, Candidate of Engineering Sciences
I. D. Ustinov, Head of Research and Education Center, Doctor of Chemical Sciences

Abstract

The main resources consumed in mineral processing are fresh water and energy. Mineral processing consumes more than 60 % of total water flow. The forecasts say that water demand will grow in mining and processing by 40 % by 2030. The studies in the possibility of water flow rate reduction in processing should be undertaken in parallel with energy consumption estimate as intakes of water and energy are tightly connected within the integrated process layout. A water-saving technology often involves an increase in consumed energy, and vice versa. Phyllosilicates with mobile crystal lattices greatly complicate dressing procedures either with dry or wet methods. A promising trend in resource-saving in processing of phyllosilicate minerals is thermal or hydrothermal modification at the beginning of a process flow in order to mitigate or eliminate negative effect of phyllosilicates on performance of ore pretreatment, separation, dewatering and end product storage. Hydrothermal modification of kaolinic ore enables its dressing at the pulp density of 40–45 % as against 20–25 % in the classic technology. Moreover, it is no more necessary to use dispersion agents. It is found that thermal treatment of sylvine ore within the range 200–500 °C considerably changes structure of minerals in insoluble fraction, which allows reducing consumption of flotation agents, diminishing flotation front, improving clarification of tailing pulps and scaling down circulating liquid phase volume. Aiming to cut down energy consumption in thermal treatment, it is possible to use microwave heating for selective warming of phyllosilicates in insoluble fraction. Thermal modification of coal results in essential change in properties of phyllosilicates as they become inactive in water absorption but increasingly magnetic susceptible, which improves efficiency of dry magnetic and electrostatic separation and ash fraction removal. These modes of modification consume more energy but enable appreciable saving of other resources.
This study was supported by the Russian Science Foundation, Grant No. 18-17-00169.

keywords Mineral processing, clay-bearing ore, resource-saving, thermal modification, phyllosilicates, hydrothermal treatment
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