METHOD FOR PREPARING THE FILLING MIXTURE OF A GIVEN CONSISTENCY (OPTIONS) Russian patent published in 2023 - IPC E21F15/00 B28C7/04 

FIELD: mining.

SUBSTANCE: invention relates to the field of mining, namely to hardening stowing mixtures, and can be used in underground mining with backfilling of goaf and contains options for preparing a stowing mixture of a given consistency. A method for preparing a backfill mixture of a given consistency according to any of the options includes dosing the mixture components, mixing them in mixing equipment to obtain a backfill mixture, followed by checking the consistency of the specified mixture. The composition of the filling mixture according to the variants of the method contains the following components in the stated ratios: according to the first - sand, binder and water; on the second - sand, binder, coarse aggregate and water; on the third - sand, binder, plasticizer and water; on the fourth - sand, binder, plasticizer, coarse aggregate and water. Before dosing the components, the applied sand is subdivided into geological differences depending on its physical and mechanical properties. Preliminary development of brand compositions of filling mixtures is carried out in the form of rows of flow charts according to selected characteristic sand samples with a step-by-step consumption of components - binder, water, aggregates within the range of water consumption required to achieve a given consistency. The technological maps indicate the grade of sand, taking into account the geological difference. Before starting the supply of the backfill mixture, a branded technological map is selected that is closest in terms of the consumption of the components of the geological difference of the sand at the entrance to the technology, and the natural moisture content of the aggregates is determined. At the same time, according to the value of the specified moisture, the number of dosed components in the task of dosing equipment is recalculated, and according to the value of natural moisture, the actual composition of the filling mixture is calculated, taking into account all the dosed components. The consistency of the filling mixture is measured, compared with the value of the specified consistency. The control of the filling mixture consistency according to the measurement results is carried out by changing the value of the specified moisture content, namely, by decreasing or increasing the value of the specified moisture content with the possibility of achieving the specified consistency. The natural moisture value is used as a starting point for maintaining a tolerance of the target moisture value relative to the natural moisture value within the water flow range step between adjacent WPSs.

EFFECT: ensuring the preparation of the backfill mixture of a given consistency using aggregates with varying physical and mechanical properties while maintaining the required grade strength and the possibility of preparing the backfill mixture in an in-line production mode.

14 cl, 2 dwg, 4 tbl, 4 ex