Optimization of the gravity enrichment regimes for coals

А. Samoilov; A. Redka

Optimization of the gravity enrichment regimes for coals

А. Samoilov A. Redka

Received 16.08.2023, Revised 17.10.2023, Accepted 28.11.2023

Abstract

Purpose. To establish scientifically based conditions for constructing a curve of elemental ash content and to create a methodology for calculating indicators for adjusting the gravity enrichment regimes for coals, which ensure the maximum yield of the concentrate at the required quality. Research methods. The problem was solved using the analysis of literary sources, studies of the fractional compositions of coal of different sizes and degree of metamorphism, and the method of data approximation. Scientific novelty. The incorrectness of the existing methods for constructing the ash content curve for elementary fractions is shown. An equation is obtained that relates the ash content of the elementary fraction with the ash content and the yield of the surfaced total fraction. A method of calculating the coordinates of points for constructing the ash curve of elementary fractions using the equations of the relationship between the actual total parameters of the fractions has been developed. Criteria are proposed for assessing the accuracy of constructing the ash content curve for elementary fractions using the calculation of the number of ash units of fractions by integrating the approximation equation and the results of approximation from the data of sunk heavy fractions. It is shown that the maximum yield of the concentrate in the separate enrichment of coal can be achieved both with the equality of the ash content of the elementary layers of the separation boundaries in accordance with the Reinhardt position, and with the equality separation density. Practical significance. The modes of enrichment of coal of different grades of Donbass, providing the equal levels of ash content of elementary layers of separation boundaries or separation density, allow increasing the yield of concentrate during gravity enrichment by an average of 0.4 % relative compared to the production of concentrates of machine classes of the same ash content. The use of the obtained conclusions is expedient for concentrating plants with the most advanced technology, including separation processes in a heavy medium. The densities of separation and heavy suspension have a fairly stable difference make it possible to quickly adjust the operating modes of the apparatuses. Results. At the preparation plant "Svyato-Varvarinska", the use of the recommended modes allows maintaining the average ash content of large wastes at a level of at least 86-87%

Keywords:

coal; fractional analysis; enrichment curves; gravity enrichment; separation mode; concentrate yield

Retrieved from Vol. 21, No. 2, 2023

Pages 59–64

References Suggested citation

[1] Смирнов В.О., Білецький В.С. Гравітаційні процеси збагачення корисних копалин. – Донецьк: Східний видавничий дім, 2005. – 300 с.

[2] Мала гірнича енциклопедія / [за ред. В. С. Білецького]. – Донецьк : Східний видавничий дім, 2013. – Т. 3. – 644 с.

[3] Моделювання процесів збагачення корисних копалин. [Електронний ресурс]: навч. посіб. для студ. спеціальності 184 «Гірництво» / В. Г. Кравець, В. С. Білецький, В. О. Смирнов, П. В. Сергєєв; КПІ ім. Ігоря Сікорського. – Електронні текстові дані. – Київ : КПІ ім. Ігоря Сікорського, 2020. – 437 с.

[4] ДСТУ 3550-97 (ГОСТ 4790-93) (ИСО 7936-1992) Паливо тверде. Визначення та наведення показників фракційного аналізу. Загальні вимоги до апаратури та методики.

[5] Геращенко К.Д. Исследование и разработка методов оценки донецких углей как объектов обогащения: автореф. дис. на здобуття ступеня канд. техн. наук: 05.15.08 , “Збагачення корисних копалин” / Донецьк, 1983. – 24 с.

[6] Кандинская И.В., Удовицкий В.И. Аналитическое представление кривых обогатимости углей. – Вестник КузГТУ. – 2004. – №4. – С. 48 – 54.

[7] Arinenkov Y. Universal model for research both optimization of technological processes and circuits of coal preparation factories on the COMPUTER / 2nd Regional APCOM’97 Symposium. Published by: The Moscow State Mining University Publishing Center. Moscow, 1997. – P. 209 – 214.

[8] Ариненков Ю.Д. Начальные условия в сепарабельном описании характеристик сыпучих материалов // Вісті Донецького гірничого інституту. – № 1, 2003. – С. 41 – 46.

[9] Пилов П.И., Святошенко В.А. Определение режима обогащения каменных углей для обеспечения максимального выхода концентрата // Збагачення корисних копалин: Наук.-техн. зб. – 2011. – Вип. 44 (85). – С. 96 – 102.

[10] Carter J. D. Implementing a Strong Maintenance Program // CPSA Journal. – 2014. – Vol. 13. No. 1. – P. 32 – 37.

Samoilov, А., & Redka, A. (2023). Optimization of the gravity enrichment regimes for coals. Journal of Kryvyi Rih National University, 21(2), 59-64. https://doi.org/10.31721/2306-5451-2023-1-57-59-64