RU2788685C1 - Composition of the modified filling material - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to the mining industry and can be used in underground mining of mineral deposits with backfilling of goaf. The modified filling material contains technical sulfur and inert aggregates - the solid phase of the tail pulp of the hydrometallurgical processing of ores and the sand-gravel mixture, in the following ratio, wt.%: the solid phase of the tail pulp of the hydrometallurgical processing of ores 50.0-61.5; sand and gravel mixture 8.1-10.6; technical sulfur 30.4-39.4.

EFFECT: increase in strength and reduction of hardening time; decrease in the consumption of natural inert filler.

1 cl, 1 ex, 1 tbl

Description

The invention relates to the mining industry and can be used in underground mining of mineral deposits with backfilling of goaf.

The composition of the filling mixture is known, including cement, ground granulated blast-furnace slag, aggregate - ground diabase, crushed straw and water in the following ratio, wt.%: cement 2.90-5.07; ground granulated blast-furnace slag 15.21-16.91; filler 52.24-53.22; water - the rest (RF Patent No. 2270921, E21F15 / 00, publ. 27.02.2006).

The disadvantages of the known composition of the stowing mixture are the relatively low strength of the stowing mass (2.3 MPa at the age of 28 days), as well as a long period of hardening and curing (5.1 MPa at the age of 180 days).

The composition of the filling mixture is known, which includes components in the following ratio, wt.%: ground granulated waste fuming slag from tin production 10.20-12.70; sodium hydroxide 1.10-1.35; burnt rocks 72.91-75.01; water the rest (RF Patent No. 2563902, E21F15 / 00, C04B18 / 14, publ. 27.09.2015).

The disadvantage of this composition of the filling mixture is the low strength of 5.75-6.90 MPa at the age of 90 days.

Also known is the composition of the filling mixture, including the following ratio, wt.%: cement 5-7; zeolite fractions <0.14 mm 2.75-3.60; limestone fractions <0.14 mm 1.25-1.80; fly ash 3.75-4.80; water 16.75-17.5; sand and gravel aggregate - the rest (Author's certificate SU1686190, E21F15/00, published 10/23/1991).

The disadvantage of this filling mixture is also low strength (compressive strength at the age of 28 days 4.8-8.1 MPa).

Closest to the proposed invention is the composition of the filling mixture containing cement, ground granulated slag, water and ground artificial serous ash filler - technical sulfur (modified with iodine) and CHP ash, pre-fused to each other and ground in a ball mill. The content of components, wt.%: cement M300D20 4.2-6.8; sulfur 29.26-19.6; CHP ash 15.24-10.1; granulated slag 26.7-39.6; iodine 0.0058-0.0038; water the rest (RF Patent No. 2302531, E21F15 / 00, publ. 10.07.2007).

The disadvantages of this composition of the backfill mixture are the low compressive strength of the samples of 2.1-7.8 MPa at the age of 180 days, as well as the multi-stage technological process for preparing the backfill material, which involves the fusion of inert materials, cooling, grinding in a ball mill and joint mixing the resulting filler with pre-crushed slag and cement.

The technical task of the proposed solution is to create a modified filling material without the use of cement, which has a high compressive strength (at least 10 MPa) in a short hardening time (on the first day), optimal technological characteristics (flowability on a Suttard viscometer 160-180 mm, stress shift 30-130 Pa) and allowing to reduce the consumption of extracted natural inert aggregate - sand-gravel mixture due to its partial replacement with tailings of hydrometallurgical production.

To solve the problem, a composition of a modified filling material is proposed, including the solid phase of the tailing pulp of the hydrometallurgical processing of ores with a size of -0.2 mm (fraction -0.074 mm 80 ± 5% by weight), a sand-gravel mixture with a particle size of -20 mm (fraction - 10 mm 90±5% by weight) and technical sulfur (GOST 127). With the following ratio of components of the composition, wt.%: the solid phase of the tailing pulp of the hydrometallurgical processing of ores 50.0-61.5; sand and gravel mixture 8.1-10.6; technical sulfur 30.4-39.4.

The technical result achieved by the invention is to increase the strength of the filling mixture without the use of cement, reduce the hardening time and increase the bearing capacity of the artificial array. A valuable advantage is the complete absence of water separation during the construction of an artificial array. This feature is significant in the conditions of backfill formation in contact with halogen rocks and a rock mass weakening when wet.

The technical result is achieved by the fact that technical sulfur is used as a binder component of the backfill material, when the composition is heated to a temperature of 120-140 ° C, the mixture components are fused, crystallized and transferred into a homogeneous structure, characterized by high strength during curing.

Example. Samples of the modified filling material were prepared in a room with an air temperature of 20 ± 2°C as follows: commercial sulfur was heated to a temperature of 128-136°C, with constant stirring until it turned into a liquid state, maintaining the temperature and without stopping stirring, alternately introduced into the composition of the solid tailing pulp phase of hydrometallurgical processing of ores (after filtration-decantation dehydration and drying) and sand-gravel mixture. After thorough mixing for 1-2 minutes of all components until a homogeneous plastic mass, the resulting material was laid out in the form of a cube (1FK 100) and kept until completely cooled at room temperature for 3 hours. After that, the samples were stripped and tested for strength under uniaxial compression.

The obtained samples of the modified filling material, made according to the proposed recipe and the described technology, with different percentages of components, as well as their characteristics are shown in the table.

composition number Components and their content in the filling material, wt.% Flowability (on the Suttard viscometer), mm Shear stress, Pa Curing time, hours *Average compressive strength, MPa Sulfur technical Hydrometallurgical tailings Sand and gravel 1 30.4 61.5 8.1 162 94.4 3 15.1 2 32.2 59.0 8.8 164 86.2 16.8 3 34.0 57.5 8.5 168 80.8 18.1 four 35.8 55.0 9.2 168 74.8 19.9 five 37.6 52.5 9.9 170 69.3 17.4 6 39.4 50.0 10.6 172 56.2 15.0 Prototype 180 days 2.1 - 7.8 * Note: the table shows the value of the uniaxial compressive strength, calculated as the arithmetic mean of one series of three samples. Uniaxial compression tests were carried out on a P-50 type hydraulic press (maximum limit load 500 kN) in accordance with GOST 10180-2012.

The analysis of the obtained results showed that the use of technical sulfur as a binder component made it possible to increase the strength of the backfill mixture in a short hardening time (up to 3 hours), eliminate the need to use it in the cement composition, and reduce the consumption of natural inert aggregate due to its partial replacement. for tailings of hydrometallurgical production.

Claims (1)

Modified filling material, including technical sulfur and inert aggregates - the solid phase of the tailing pulp of hydrometallurgical processing of ores and sand-gravel mixture, characterized in that, in order to increase strength, it contains technical sulfur as a binder component, in the following ratio of components, wt.%: solid phase of the tail pulp of hydrometallurgical processing of ores 50.0-61.5; sand and gravel mixture 8.1-10.6; technical sulfur 30.4-39.4.