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Известково-белитовое вяжущее на основе отходов ГОКов

Известково-белитовое вяжущее на основе отходов ГОКов

Abstract

During the process of iron-ore concentration by wet magnetic separation method a large amount of waste, which is now stacked in disposal areas, is formed. The results of research about possibility of using the wet magnetic separation waste for obtaining low burning calciferous-belite agent are presented in this article. When burning carbonate and silica mixture with addition of magnetic separation tailings (hydraulic module m = 2,22–1,43) at temperatures of 1100–1200 °C, the product received contains in its composition calcium ferrite despite the basic minerals CaO and calcium silicate. At that the mechanical impurities of raw material conduce the formation of hydraulically active forms of calcium orthosilicate – α’и β-2СаО.SiO2. The activity of obtained binding agent in mixture with quartz sand in autoclave conditions is analyzed: physical and mechanical tests showed that after a 4-hour process of hardening in hydrothermal conditions binding agent’ durability exceeds 40МPа and phase composition contains mainly hydrosilicates of different base strength, and hydrated calcium ferrites are presented. The results of research allow to give a qualitative appraisal of burning’s product of calciferous-belite composition as a basic component, participating in the processes of hardening of mixed binding agents.

При обогащении железной руды методом мокрой магнитной сепарации образуется большое количество отходов, которые складируются в настоящее время в отвалы. В данной статье представлены результаты исследований возможности использования отходов мокрой магнитной сепарации для получения низкообжигового вяжущего известково-белитового состава. При обжиге карбонатно-кремнеземистых смесей с добавкой хвостов мокрой магнитной сепарации (гидравлический модуль m = 2,22 – 1,43) при температурах 1100–1200 °С получен продукт, в составе которого кроме основных минералов СаО и двухкальциевого силиката содержатся ферриты кальция. Причем примеси сырья способствуют образованию гидравлически активных форм ортосиликата кальция – α’и β-2СаО.SiO2. Исследована активность полученного вяжущего в смеси с кварцевым песком в автоклавных условиях: физико-механические испытания показали, после 4-часового твердения в гидротермальных условиях прочность вяжущего превышает 40 МПа, а фазовый состав представлен в основном гидросиликатами различной основности, присутствуют гидроферриты кальция. Результаты исследований позволяют качественно оценить продукт обжига известково-белитового состава как основного компонента, участвующего в процессах твердения смешанных вяжущих.

Keywords

ВЯЖУЩЕЕ, ИЗВЕСТКОВО-БЕЛИТОВОЕ ВЯЖУЩЕЕ, ДВУХКАЛЬЦИЕВЫЙ СИЛИКАТ, МОДИФИКАЦИИ, ОТХОДЫ ГОКОВ, ХВОСТЫ МОКРОЙ МАГНИТНОЙ СЕПАРАЦИИ, ОБЖИГ, ГИДРОТЕРМАЛЬНЫЕ УСЛОВИЯ, СТРУКТУРА, АКТИВНОСТЬ, ФАЗОВЫЙ СОСТАВ, ГИДРОСИЛИКАТЫ КАЛЬЦИЯ, ОСНОВНОСТЬ, ТВЕРДЕНИЕ, ГИДРАТАЦИЯ, ПРОЧНОСТЬ, АТМОСФЕРОСТОЙКОСТЬ, MINING AND PROCESSING WORKS’ WASTE

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
gold