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Ivan D. Ustinov
Ivan D. Ustinov
Chief Researcher, Ph.D., Dr.Sci.
NPK “Mekhanobr-tekhnika” (AO)
Chief Researcher, Ph.D., Dr.Sci.
NPK “Mekhanobr-tekhnika” (AO)

Articles

Geotechnical Engineering and Engineering Geology
  • Date submitted
    2022-10-24
  • Date accepted
    2023-03-03
  • Date published
    2023-04-25

Use of clay-containing waste as pozzolanic additives

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Growing productivity of mining and processing enterprises entails an increase in the volumes of liquid tailings impoundments and upstream impoundments of ore processing waste. Enterprises face the challenge of minimizing the environmental impact of waste and guaranteeing the sanitary and epidemiological safety of population. The article presents a possibility of recycling one type of such waste (clay-containing concentration tailings of apatite-nepheline and sylvinite ores, coal beneficiation tailings) by using them after preliminary thermochemical treatment as pozzolanic additives to cements and concretes, including concrete mixtures used for soil stabilization, development of territories, reclamation of mine workings, as a component of the insulating layer of landfills for the disposal of municipal solid waste. An analysis of the phase changes of kaolinite, one of the main minerals that make up clay-containing waste, in the temperature range of 200-1,000 °С showed that a change in its mineral form during heat treatment is the main factor in changing its pozzolanic activity. The effect of heat treatment of clay minerals at temperature of 700-800 °C on their pozzolanic activity, estimated by the ability to absorb calcium hydroxide (0.7 g Ca(OH) 2 per 1 g of modified kaolinite), is considered. It is shown that the addition of heat-treated samples (20 % by weight) improves the quality of cement increasing its activity by 15 %, in comparison with the use of unmodified clay minerals. It was proved experimentally that partial replacement of Portland cement with thermally modified kaolinite increases the strength of consolidating stowing mixture by up to 15 %. This approach to processing of ores containing layered silicates, which provides for thermochemical modification of run-of-mine ore, intensifies the processes of tailings thickening and filtering.

How to cite: Gerasimov A.M., Ustinov I.D., Zyryanova O.V. Use of clay-containing waste as pozzolanic additives // Journal of Mining Institute. 2023. Vol. 260. p. 313-320. DOI: 10.31897/PMI.2023.33
Without section
  • Date submitted
    1972-09-14
  • Date accepted
    1972-11-26
  • Date published
    1973-03-01

О физико-химических особенностях взаимодействия комплексообразующего собирателя ИМ-50 с ионами железа флотационной пульпы

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Гидроксамовые кислоты рекомендовали широко исполь­зовать в качестве реактивов для количественного и качествен­ного анализа металлов, их экстракционного выделения, а также в качестве собирателей в процессах флотационного обо­гащения руд редких и цветных металлов. Благодаря простой технологии синтеза алкилгидроксамовых кислот с использованием водных растворов гидроксиламинсульфата, на обогатительных фабриках СССР нашел применение реагент ИМ-50, состоящий из гидроксамовых кислот фрак­ции С 7 —С 9 или их натриевых солей. Изучение действия гид­роксамовых кислот при флотации показало, что их взаимо­действие с ионами железа, находящимися в объеме пульпы и на поверхности минералов, оказывает существенное, а иногда и определяющее влияние на результаты обогащения ...

How to cite: Gorlovskii S.I., Ustinov I.D. // Journal of Mining Institute. 1973. Vol. № 3 54. p. 3.