Determination of the influence of pulp viscosity on the enrichment process of magnetite suspensions in screw separators

Authors

DOI:

https://doi.org/10.15587/2706-5448.2025.323268

Keywords:

suspension viscosity, screw separator, magnetite pulp, particle shape, solid concentration, temperature regimes

Abstract

The object of research is the process of enrichment of magnetite suspensions in screw separators, taking into account the particle size distribution, the compressibility of the liquid in the interparticle space, and the shape of the particles, which allows to assess the influence of these factors on the value of the effective viscosity of the suspension. The viscosity of the suspension is one of the properties for ore suspensions with a wide range of particle sizes and different concentrations of solids in operations and products. It determines the nature of the movement of the liquid, the state of the solids in it – the degree of its loosening, the difficulty of sedimentation, and energy consumption for transportation during the enrichment of magnetite ores in screw separators. The studies were conducted using analytical and experimental methods. It was experimentally established that the dependence of the viscosity of the pulp suspension on the particle size in the range of less than 1 mm has an inversely proportional relationship. At a volume concentration of solids in the pulp from 10 to 70 %, the viscosity of the suspension increases with a decrease in the volume concentration of the minus 0.1 mm class from 100 to 20 %. It has been established that at temperature regimes from 28 to 50 °C, the viscosity of magnetite suspensions increases with a decrease in the grinding fineness in different ways. The viscosity of magnetite suspensions depends on the mass fraction of solids: material with a fineness of 80 % minus 0.044 mm increases the viscosity of the suspension at concentrations above 40 %, and at a fineness of 80 % minus 0.031 mm – above 60 %.

The obtained scientific result, in the form of a calculation of the effective viscosity of the pulp, is based on a theory that takes into account the influence of particle size as a function of their average effective diameter, concentration and shape of suspended particles. From a practical point of view, the research results allow to develop optimal conditions for gravitational enrichment of magnetite ores in screw separators and avoid additional losses of valuable components.

Author Biographies

Tetiana Oliinyk, Kryvyi Rih National University

Doctor of Technical Sciences, Professor

Department of Mineral Processing and Chemistry

Dmytro Rumnytskyi, Kryvyi Rih National University

PhD Student

Department of Mineral Processing and Chemistry

Liudmyla Skliar, Kryvyi Rih National University

PhD, Associate Professor

Department of Mineral Processing and Chemistry

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Determination of the influence of pulp viscosity on the enrichment process of magnetite suspensions in screw separators

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Published

2025-02-25

How to Cite

Oliinyk, T., Rumnytskyi, D., & Skliar, L. (2025). Determination of the influence of pulp viscosity on the enrichment process of magnetite suspensions in screw separators. Technology Audit and Production Reserves, 1(3(81), 6–18. https://doi.org/10.15587/2706-5448.2025.323268

Issue

Vol. 1 No. 3(81) (2025): Chemical engineering

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Chemical and Technological Systems

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Copyright (c) 2025 Tatуana Oliinyk, Dmytro Rumnytskyi, Liudmyla Skliar

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