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Scientific, Technological and Production Journal
ISSN 2079–3332 (print)
ISSN 3034-6835 (online)
founded in 2001

Advantages of consolidating backfill mixture compositions and technology using sylvinite waste

Original articles: 2026 No 4

Advantages of consolidating backfill mixture compositions and technology using sylvinite waste

DOI: 10.56195/20793332-2026-26-4-71-82

Read in pdf V. I. Tatarnikov
  1. Academician N. V. Melnikov Institute of Comprehensive Exploitation of Mineral Resources of the Russian Academy of Sciences, Moscow, Russian Federation
p. 71-82, No.4/2026
Abstract:
The study addresses the compositions and preparation technology of consolidating backfill mixtures produced from sylvinite beneficiation waste for the Gremyachinskoye potash deposit. Its objective was to justify differentiated formation of the main backfill mass and the roof-contact zone while limiting recycled-brine and cement consumption. The methods comprised X-ray diffraction and particle-size analyses, a full-crossed laboratory experiment, measurements of density, mobility, spread, compressive strength, and deformation characteristics, and pilot-scale testing of mechanized and pneumomechanical placement. The free-brine release threshold of the cement-free mixture was established at a recycled-brine dosage of 280 kg/m3. The recommended mixture for the main backfill volume contains 1780 kg/m3 of salt waste and 280 kg/m3 of recycled brine and reaches a compressive strength of 3.6 MPa after 90 days. The mixture selected for roof-contact filling contains 1270 kg/m3 of salt waste, 200 kg/m3 of cement, and 450 kg/ m3 of recycled brine; its mobility is 8 cm, its spread is 13 cm, and its 90-day compressive strength is 4.3 MPa. The novelty of the study lies in separating mixture preparation according to the structural function of each backfill zone. A two-line process scheme is proposed: a cement-free mixture forms the main volume, whereas a locally used flowable cement-containing mixture fills the voids beneath the chamber roof. This approach prevents free-brine release, restricts cement use, increases the filling ratio above 0.9, and creates the calculated potential to increase sylvinite reserve recovery by 20% through partial extraction of inter-chamber pillars.
Keywords:
consolidating backfill; sylvinite beneficiation waste; salt waste; recycled brine; free-brine release threshold; backfill mass; roof-contact filling; pneumomechanical placement; reserve recovery>
For citation:
Tatarnikov V.I. Advantages of consolidating backfill mixture compositions and technology using sylvinite waste. Mine Surveying and Subsurface Use. 2026; 26 (4): 71-82. (In Russ.). https://doi.org/10.56195/20793332-2026-26-4-71-82.
Information about the authors:
  1. Valentin I. Tatarnikov – Postgraduate Student, Department of Challenges in Modelling and Management of Mining Systems; Junior Researcher, Laboratory of Intelligent Monitoring Methods of Mining Systems, Academician N. V. Melnikov Institute of Comprehensive Exploitation of Mineral Resources of the Russian Academy of Sciences, Moscow, Russian Federation; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
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