The composition of the filling mixture

 

(57) Abstract:

The invention relates to the mining industry and can be used in underground mining with the mined-out space. The technical result is an increase in strength due to the stimulation of hardening concrete mixtures while maintaining effective flowing property of filling mixture and expansion of waste disposal. The composition of the filling mixture containing cement, surface-active additive, filler and water, characterized in that it further comprises amorphous precipitation treatment of industrial wastewater on the basis of calcium sulphate, and as surface-active additives used bacterial additive containing products of the oxidation of aqueous solutions of iron sulfate (II) and/or pulp compounds containing iron and sulfur in the presence of microorganisms Tiobacillus ferrooxidans in the following ratio, wt.%: cement 4-10,5, bacterial additive 0,55-10,2, amorphous precipitation treatment of industrial wastewater on the basis of calcium sulphate 10,0-60,0, the aggregate of 12.5-72,0, water the rest, while the number of bacterial additives to define the dependence y=0,63/X, where y is the ratio of the bacterium is 1 tab.

The invention relates to the mining industry and can be used in underground mining with the mined-out space.

Known composition of the filling mixture, containing in weight. %: cement, a 9.5 to 11.4, surface-active additive, which is used sodality waste production - 0,57-0,91, placeholder 71,4-73,0, water - else (USSR Author's certificate 935634, CL E 21 F 15/00, 1982). The strength of samples of the mixture to compression-3,5-4,2 MPa/cm2at the age of 1 month with effective flowing property 140-160 mm

The disadvantage of this method is the low mechanical strength and limited disposal otkhodov production.

The task of the invention is to increase the strength and at the same time increasing recycling waste production with preservation of effective flowing property of filling mixture.

To solve the problem in the known composition of the filling mixture containing cement, surface-active additive, filler and water, according to the invention additionally impose amorphous precipitation treatment of industrial wastewater on the basis of calcium sulphate, and as surface-active additives use is ineni, containing iron and sulfur in the presence of microorganisms Thiobacillus ferrooxidans in the following ratio, wt. %:

Cement - 4-10,5

Bacterial additive - 0,55-10,2

Amorphous precipitation treatment of industrial wastewater on the basis of calcium sulphate - 10,0-60,0

Aggregate - 12,5-72,0

Water - the Rest

the number of bacterial additives to define addiction

y = 0,63/X

where y is the ratio of bacterial additive to amorphous precipitation, industrial wastewater treatment;

X - amount of cement in the range from 1 to 10.5, wt.%.

Particles of amorphous precipitation treatment of industrial wastewater on the basis of calcium sulfate CaSO42H2O do not have solid surfaces become less durable connection with astringent, and this increases the effective flowing property of filling mixture and simultaneously to the reduction of mechanical strength. Introduction in a mixture of bacterial additive stabilizes mentioned relationships and allows you to increase the proportion of amorphous precipitation in mixtures with simultaneous increase their mechanical strength.

Contained in a bacterial additive cells of microorganisms Tiobacillus ferrooxulans, purged of their activity and decay (proteins, lipids, and other), as well as comprehensive the Oia concrete mixtures.

The empirical dependence allows for permanent containing cement and gypsum in the filling mixture to calculate the bacterial content of the additive in the whole range from 0.55 to 10.2, weight. %, while the indicators for effective flowing property and strength of the backfill mixture reaches 150-160 mm and 5.6-6.3 MPa/cm2.

The technical result from the use of a mixture is the promotion of the processes underlying the hardening of concrete mixes, while maintaining effective flowing property of filling mixture and, thus, increase strength n expansion of waste.

Example (prototype). As the source materials used cement grade 400, sodality waste production, limestone filler fraction is 10 mm, the tap water.

Backfill mixture is prepared by mixing dry ingredients for 5 minutes. Sodality waste is dissolved in water and add to the dry compositions. The components of the mixture injected in amounts (in weight. %): cement - 10,5, sodality waste - to 0.72; lime filler - 72,0; 16.78 in water. The mixture is poured into the form and have the mechanical strength of the hardened concrete samples by the method according Holyrood using the device Attard.

The following results are obtained: the flowing nature of 150-160 mm, the mechanical strength of 42 MPa/cm2(table).

Example 2 (invention). As the source materials used cement grade 400, amorphous deposits of lime treatment of industrial wastewater on the basis of calcium sulphate, bacterial additive, lime filler and tap water.

Bacterial additive in experiments 1-3 introduced into the mixture in the form of products of oxidation of aqueous solutions of iron sulfate (II), in experiments 4-6 - in the form of a mixture of this solution and pulp compounds containing iron and sulfur, in experiments 7-12 in the form of pulp compounds containing iron and sulfur in the presence of microorganisms Tiobacillus ferrooxidans.

The flow of components in the mixture are given in table.

Stowing mixture is prepared and feel the same way as in example 1.

According to the results of experiments with the effective flowing property 150-160 mm strength of the mixture is increased by 0,8-2,1 MPa/cm2. The content of oxidation products of an aqueous solution of iron (II) and pulp compounds containing iron and sulfur in the presence of microorganisms Tiobacillus ferrooxidans together or separately did not significantly affect the quality of sacla ITIL and water, characterized in that it further comprises amorphous precipitation treatment of industrial wastewater on the basis of calcium sulphate, and as surface-active additives used bacterial additive containing products of the oxidation of aqueous solutions of iron sulfate (II) and/or pulp compounds containing iron and sulfur in the presence of microorganisms Tiobacillus ferrooxidans in the following ratio, wt. %:

Cement - 4 - 10,5

Bacterial additive - 0,55 - 10,2

Amorphous precipitation treatment of industrial wastewater on the basis of calcium sulphate - 10,0 - 60,0

Aggregate - 12,5 - 72,0

Water - the Rest

the number of bacterial additives to define addiction

y = 0,63/X

where y is the ratio of bacterial additive to amorphous precipitation, industrial wastewater treatment;

X - amount of cement in the range of 4 to 10.5, weight. %.

 

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