Authors: A.I. Kopytov, S.А. Starodubtsev

Title of the article: Methods of preparation and improvement of backfill pastes physico – mechanical properties

Year: 2024, Issue: 5, Pages: 74-80

Branch of knowledge: 2.8.6. Geomechanics, destruction of rocks by explosion, mine aerogasdynamics and mining thermophysics

Index UDK: 622

DOI: 10.26730/1999-4125-2024-5-74-80

Abstract: The article presents the results of the study of research and experience in the preparation and improvement of the composition of the backfill paste in order to increase the efficiency and safety of iron ore development system by backfill mine-out space from protective pillars at the Tashtagolskaya mine to ensure the stability of the supply of high-quality iron ore concentrate to the metallurgists of Novokuznetsk. An analysis of national and foreign experiece in the development of ore deposits shows that the development of mining production is carried out mainly due to the development of new ore deposits at a depth of up to 2 km with a constant annual decrease in mining operations by 20-40 m. Transition to greater depths, the conditions for tunneling and cutter operations deteriorate sharply due to changes in the physical and mechanical properties of rocks, a steady increase in rock pressure and the probability of its manifestation in dynamic form in face zones, the conditions and safety of miners deteriorate, prerequisites for possible environmental damage are created. As a result of the study of scientific research and practical experience, it was found that one of the impotant directions for improving the geotechnology of underground mining in these conditions is the introduction of backfill mine-out space development systems. Backfill mine-out space development systems ensure minimal deformation of the mined rock mass and preservation of the surface, a relatively safe working condition, increase the efficiency of subsurface use by reducing losses and dilution, recycling mining waste and increasing the completeness and quality of ore extraction. However, their use is limited by the value of mineral raw materials due to the high cost of mining operations. One of the significant disadvantages affecting the increase expenses and the cost of production of backfill mine-out space geotechnology is the long-term solidification of the backfill paste for up to 28 days, this contributes to a decrease in the efficiency and stability of the mining enterprise. Tests conducted at the Talnakh mines showed that it is possible to improve the physical and mechanical properties and reduce the durability of backfill paste by introduction of special plasticized additives.

Key words: Iron ore mining backfill production technology of backfill paste plasticized backfill pastes

Receiving date: 05.07.2024

Approval date: 29.09.2024

Publication date: 24.10.2024

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