The composition of the filling mixture

 

(57) Abstract:

The invention relates to the mining industry and can be used in the development of mineral deposits with the mined-out space. The technical result is an increase in strength of the filling mixture, recycling the hydrometallurgical production, reduction of environmental pollution. The composition of the backfill mixture comprising cement, ground granulated blast furnace slag, inert filler and water, as inert filler contains amorphous precipitation neutralization of sulfuric acid with limestone, pre-treated with an aqueous solution of sulphate of iron (III) Fe(OH)S04,in the following ratio, wt.%: cement 4,0-6,8, ground granulated blast furnace slag a 9.7-16.5, and amorphous precipitation neutralization of sulfuric acid with limestone 31,7 of 40.8, hydroconsult iron (III) 1,2-2,0, water the rest. table 2.

The invention relates to the mining industry and can be used in the development of mineral deposits with the mined-out space.

Known composition of the backfill mixture comprising cement, waste limestone crushing and mill tailings in the and other Backfilling in mines. M.: Nedra, 1989, S. 111). The strength of the filling mixture in the age of 180 days is 1.5-2.16 MPa.

The disadvantage of this structure is the low strength backfill mixture.

The basis of the invention is the use of filling mixture hydrometallurgical waste production and at the same time increasing its strength.

This is achieved by the fact that the known composition of the backfill mixture comprising cement, ground granulated blast furnace slag, inert filler and water, according to the invention as inert filler use amorphous precipitation neutralization of sulfuric acid with limestone, pre-treated with an aqueous solution of gidroksosulfat iron (III) Fe(OH)S04, in the following ratio, wt.%:

Cement - 4,0-6,8

Ground granulated blast furnace slag of 9.7 to 16.5

Amorphous precipitation neutralization of sulfuric acid with limestone - 31,7 of 40.8

Hydroconsult iron (III) - 1,2-2,0

Water - the Rest

Amorphous precipitation neutralization of sulfuric acid lime (gypsum-based waste hydrometallurgical plants) form a tenuous connection with astringent, because they are melkodispersnoi inert filler prototype leads to lower mechanical strength backfill mixes. Warning this decrease and increase the strength of the mixture compared to the prototype reaches a pre-treatment of the amorphous precipitation with an aqueous solution of gidroksosulfat iron (III) Fe(OH)S04because it has astringent properties (G. M. periwinkle, M. M. Sychov, N. Y. Hermes. Journal of applied chemistry, 12, 1985, S. 2662-2665) and increases the mechanical strength of the mixtures.

In addition, the use of amorphous precipitation neutralization of sulfuric acid with limestone for laying mines mines mining eliminates the accumulation of their on-site enterprises, to reduce the contamination of the environment and to liberate the lands occupied by them.

Example.

An amorphous precipitate neutralization of sulfuric acid with limestone, pre-treated with an aqueous solution of gidroksosulfat iron (III), douaville the desired quantity of cement M400 and granulated blast furnace slag, crushed in a ball mill to a particle size of 80% of class - 0,074 mm, the final mixture was mixed to a uniform consistency. The resulting mixture is prepared sample size HH mm Samples after hardening stood under a layer of wet sawdust within 90 days is whether and tested different formulations of filling mixtures. In table.1 shows the chemical composition of the starting components of the mixtures as in table.2 - source gross composition of the mixtures and the results of testing the mechanical strength of samples prepared from these mixtures. From table.2 it follows that the task of increasing the mechanical strength backfill mixtures according to the prototype(2,16 MPa) is achieved when a complete replacement of mixtures of waste crushing izvestnikh and tailings (prototype) amorphous sludge neutralization of sulfuric acid with limestone, pre-treated with an aqueous solution of gidroksosulfat iron (III) under the conditions:

1. The amount of aqueous solution of gidroksosulfat iron (III) supplied to the testing of the amorphous precipitation, not less than 1.2 wt.% (in terms of dry weight FeOHS04).

2. Introduction to the stowing mixtures of cement and blast furnace slag when their consumption is not lower than - 4.0 wt.% and 9.7 wt.% respectively.

The increase of the additive aqueous solution of gidroksosulfat iron (III) above 1.2 wt. % leads to an increase in mechanical strength backfill mixtures (table.2), but not economically feasible above 2.0 wt.%.

The increase in cement consumption above 4.0 wt.% and blast furnace slag above 9.7 wt. % while maintaining an optimal balance between the ski impractical above to 6.8 wt.% cement and 16.5 wt.% blast furnace slag.

Boundary content of binders, above which the mechanical strength of the prototype (4.0% cement; 9.7% slag), corresponds to the content of amorphous gypsum precipitate of 40.5 wt.% (PL.2). By increasing the proportion of binder in the composition of the backfill mixtures the proportion of amorphous gypsum precipitation in them is reduced and economically feasible compositions should not be below to 31.7 wt.%.

The composition of the backfill mixture comprising cement, ground granulated blast furnace slag, inert filler and water, characterized in that as an inert filler use amorphous precipitation neutralization of sulfuric acid with limestone, pre-treated with an aqueous solution of gidroksosulfat iron (III) Fe(OH)SO4, in the following ratio, wt. %:

Cement - 4,0-6,8

Ground granulated blast furnace slag of 9.7 to 16.5

Amorphous precipitation neutralization of sulfuric acid with limestone - 31,7 of 40.8

Hydroconsult iron (III) - 1,2-2,0

Water - Ostalnoe

 

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