Composition of stowage mixture

FIELD: mining.

SUBSTANCE: invention refers to mining and can be implemented at development of mineral deposits with stowing mined space. Composition of stowage mixture containing milled granulated blast furnace slag, inert filler and water consists of the said acidic slag of fractions smaller, than 0.071 mm not less 90 wt %, as inert filler - wastes of concentration of wet magnet separation of ferrous quartzite containing fractions smaller, than 0.071 mm not less 90 wt %, additionally - super fluidising agent SP-1 at the following ratio of components, wt % said slag 22, said wastes 54.5, super fluidising agent SP-1 0.4 of slag contents, water - the rest.

EFFECT: raised strength, increased volumes of utilised anthropogenic wastes for considerable improvement of ecological medium.

1 ex, 2 tbl

 

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

Known filling mixture comprising cement, ground granulated blast furnace slag, aggregate, and water in the following ratio, wt.%: cement - 2; ground granulated blast furnace slag - 18,4; aggregate - 61,38; water-other [1].

The disadvantages of this mixture are low ductility due to insufficient content of the fine fraction, and low strength of 3.0 MPa at 90 days of constructed array through the use of a filler with a tensile strength below the normative strength of the bookmark.

Closest to the proposed invention is a compound of backfill mixture comprising cement, ground granulated blast furnace slag, inert filler and water. As the inert filler the composition contains amorphous precipitation neutralization of sulfuric acid with limestone, pre-treated with an aqueous solution of sulphate of 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 - the rest [2].

The disadvantages of this structure are used as a binder scarce material - cement and slag with a higher quality factor 1,51 (table 1); the complexity of the composition, complicating cooking it in an industrial application, as it will require additional lines and operations to add each component; high consumption of water, requiring additional funds and equipment for drainage operations.

Objectives of the invention are: the exclusion of expensive cement and the use of slag lower grades at higher strength;

reducing the amount of water, while maintaining effective flowing property of filling mixture;

the reduction of components of the mixture and increasing the volume of recyclable industrial waste to a significant improvement of the ecological environment of the region.

The problem is solved by the proposed composition of the filling mixture, which includes ground granulated blast furnace slag, a binder, an inert filler and water, and further comprises a surface-active additive superplasticizer SP-1, and as an inert filler use tailings wet magnetic separation of ferruginous quartzite containing particles less than 0.071 mm not less than 90%, in addition the binder ground granulated blast acidic slag, containing not less than 90% fractions less than 0.071 mm, the next CEO of the wearing components, wt.%:

ground granulated blast acidic slag - 22;

tailings wet magnetic separation of ferruginous quartzite is 54.5;

superplasticizer SP-1 - 0,4 content of the slag;

water - the rest.

Example. Granulated blast furnace slag to grind in a ball mill to a particle size at a ratio of not less than 90% of the class less 0,071, mixed waste processing, containing not less than 90% of particles less than 0.071 mm, and closed the water in which pre-add superplasticizer SP-1. The final mixture was mixed to a uniform consistency. The resulting mixture is prepared samples of size 70×70×70 mm, which were kept in a climatic chamber for 2-3 days before reaching the Stripping strength of the samples. In the chamber was maintained temperature 20±20°C and relative humidity of 90-95%, i.e. conditions similar to the conditions of curing of the array in the mine. After demoulding, the specimens were again placed in the climatic chamber for further curing for 90 days, after which determined the mechanical strength using a hydraulic press. The following results are obtained: flowing the filling mixture - 165 mm, sediment cone "Strasznie" - 15 cm, the mechanical strength is 7.0 MPa at the age of 90 days when the water content of 23.4%. Similarly prepared and tested different formulations of filling mixtures.

Table 1
The chemical composition of blast furnace slag
The quality factorCaO, %SiO2, %Al2About3, %MgO, %MnO, %Other %
The placeholder1,5128,936,517,610,90,7of 5.40
Declare1,2340,442,7of 5.46,70,0264,78

Table 1 presents the chemical composition of the granulated blast furnace slag, and in table 2 - source gross composition of the mixtures and the results of testing the mechanical strength of samples prepared from these mixtures.

Superplasticizer SP-1 on the basis of a product of condensation of naphthalenesulfonate and formald the guide (polynaphthalenesulfonate or methylenbis(naphthalenesulfonate) sodium) produced according to TU 5870-005-58042865-05.

Hydraulic properties of blast furnace slag evaluated according to GOST 3476-74 the quality factor K, which is determined by the formula:

when the content of magnesium oxide to 10%

when the content of magnesium oxide is more than 10%:

For grades 1 K=1,65, 2 varieties K=1,45, 3 varieties of 1.2.

From table 2 it follows that the task of increasing the mechanical strength backfill mixtures according to the prototype (4,35 MPa), reducing the amount of water, while maintaining the consistency of the mixture, suitable for transportation, is achieved by adding plasticizer SP-1 and provided that the content of particles less than 0.071 mm, % in the tailings and hammer granulated blast furnace slag is not less than 90%.

The use of the proposed technical solution completely eliminates the consumption for filling operations of expensive cement, and also allows you to provide high technological properties of backfill mixes - spreading and normative strength while reducing the volume of water, replacement of slag on the more low-grade, to reduce the number of components of the mixture and to increase the volume of recyclable industrial waste to a significant improvement of the ecological environment of the region.

Sources of information

1. Lukowski, Emeniem, Kuip. The use of blast furnace slag dump for the preparation of a knitting bet is offered by the mixture. Mining magazine, 1979, No. 1, p.39.

2. RF patent №2186989 published 10.08.2002,

The composition of the filling mixture, including ground granulated blast furnace slag, inert filler and water, characterized in that it contains the specified acidic slag containing particles less than 0.071 mm not less than 90 wt.%, as the inert filler - tailings wet magnetic separation of ferruginous quartzite containing particles less than 0.071 mm not less than 90 wt.%, optional superplasticizer SP-1, in the following ratio, wt.%:

specified slag22
these wastes54,5
superplasticizer SP-10,4 content of the slag
waterrest



 

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