Hardening fill mixture

FIELD: mining.

SUBSTANCE: invention is related to mining industry, namely to hardening fill mixtures. It includes filler, liquid sodium glass, gypsum, cement. Fill mixture is additionally supplemented with flocculant and martite-hematite iron ore, with the following ratio of mixture components: liquid sodium glass 20-22%; cement 1-2%; gypsum 1-2%; flocculant 0.002-0.004%; martite-hematite iron ore 1%; filler - the rest.

EFFECT: improved quality of technological properties of hardening fill mixture, reduced prime cost, increased bearing capacity of filled mass, reduced consumption of hardening solution and simplified technology of stripped area filling.

2 cl, 1 tbl

 

The invention relates to the mining industry and can be used in underground mining systems with mined-out space hardening filling mixture, which is applied substandard Sands with low fineness modulus less than 0.7. The use of a flocculant (Alclar) allows to reduce the dispersion of sand that makes it possible to reduce the cement content to a minimum (1-2%), but as a main binder to use liquid glass with density ρ=1300 kg/m3.

Known backfill material (application No. 2001104570 from 20.01.2003), including crushed rock and hardening the mixture, characterized in that the quality of the crushed rocks it contains crushed rock with grain size, providing after her vibrating laying in a goaf education laid the array with porosity 7-15%, and as a hardening mixtures injectively in its pores hardening solution.

The lack of backfill material for the mixture is the fact that as aggregate backfill material contains crushed rock rock, which greatly increases its value, for example, compared with non-conforming sandy filler and makes it difficult to control the quality of the bookmark.

Known for the hardening busslinjerna stowing mixture (patent RF №2275505, from 05.11.2004), including crushed lime-containing binder in the form of active aluminosilicate material and calcined carbonate rocks, mixing water, phlegmatizer, the placeholder that contains annealed at 900-1200°C carbonate rocks with the content of the active oxides of calcium and magnesium CaO+MgO in them not less than 40% and not more than 9.1 percent by weight of the mixture, crushed to sieve residue of 0.08 mm, not more than 15%, as the active aluminosilicate material is burnt marl or calcined clay or calcined tailings kimberlite ores, or granulated blast furnace slag and water mixing contains phlegmatizer in the amount determined by the formula: D=(0,005÷0,021)·C/NE, where D is the number of phlegmatizer in 1 l of water mixing, kg (0,005÷0,021) - coefficient taking into account the proportion of phlegmatizer and burnt carbonate rocks in the mixture; C - consumption burned carbonate rocks in the mixture, kg; SV - experimentally determined flow rate of the mixing water in the mixture, l, with the ratio of components in the filling mixture, wt.%: active aluminosilicate material - 5,6-33,2, burnt carbonate rocks - 1,0-16,7, the water mixing with phlegmatizer - 10,6-27,5, filler - the rest. When exceeding the specified content of active CaO+MgO in the mixture is transferred CaO and MgO in the hydroxide spraying water in to the Icesave not more than 20% by weight of the calcined carbonate rocks in terms of active CaO+MgO. As carbonate rocks using the host rock kimberlite deposits, as aggregate - sand, and/or tailings, and/or crushed silica rock - tuff, and/or diabase rock, and/or carbonate rock, as phlegmatizer - lignosulfonate technical - lsls or superplasticizer C-3 and lsls taken in a 2:1 ratio.

The disadvantage backlinking backfill mix is the fact that a high concentration of active oxides of calcium and magnesium provides vodonepronitsaemost this filling mixture; when exposed to water containing carbon dioxide or hydrogen sulfide, or acidified water due to the dissolution and removal of Cao and MgO is a sharp decrease of the strength and stability of the backfill array. These disadvantages are completely absent in the proposed composition of the filling mixture in which the binder is glass with a minimum cement content.

Known cement slurry, selected as a prototype (patent No. 2001135982 from 27.12.2001), for bridging Sakrebulo space shafts potash mines, containing cement, shuts the fluid, characterized in that the plasticizing and sealing additives, regulating the timing of hardening, use a solution of lignosulfonates as additives that increase the resistance and the density of the MCA and, used fly ash, liquid glass, calcium chloride, as expanding additives used gypsum, quicklime.

The disadvantage of cement slurry is the use of cement as the main binder, which significantly increases the cost of filling mixture, and the use of lignosulfonate - toxic waste pulp and paper industry does not meet the environmental requirements on the application materials in mines, as well as the protection of groundwater against pollution. In the present invention are environmentally friendly components, which significantly reduce the monetary cost of manufacturing large volumes of backfill mixtures with the use of substandard Sands with low fineness modulus.

The technical result - the quality improvement of technological properties of hardening filling mixture, reduce costs, increase the bearing capacity of embedded array.

The technical result is achieved by hardening filling mixture comprises a filler, sodium liquid glass, plaster, cement, according to the invention in the mixture is further added flocculant (Alclar), martite-hematite iron ore, when the ratio of mixture components:

- sodium liquid glass (density 1300 kg/m3) 20-22%;

cement 1-2%;

- gypsum 1-2%;

- Flo is meant 0,002-0,004%;

- iron ore, martite-hematite 1%;

placeholder - the rest.

The technical result is achieved by the fact that, as a filler mixture contains substandard quarry sand with fineness modulus less than 0.7.

Studies were conducted on the basis of theory of experiment planning, involving analytical developments in the field of physico-chemical and chemical processes for the synthesis of binding using substandard aggregates based on the criterion of their particle size distribution (module size), laboratory works, consisting of certain stages:

- preparation of air-dried mixture of several components (sand + cement + gypsum + iron ore) in the specified percentage by weight of sand;

- preparation of solutions (liquid glass + flocculant);

- thorough mixing of the solid and liquid components;

- forming samples of a certain shape and size;

- hardening of the samples at room temperature 20±2°C for 4-28 days;

- test samples for presses to get the size of the temporary resistance to compression.

To study the optimal composition was studied 15 recipes.

Example. Table 1 shows the results of the research hardening filling mixture.

The proposed composition of the filling mixture provides the opportunity ISOE is isawanya as the main filler substandard thin and small career Sands with low fineness modulus with the use of active flocculant (Alclar) to aggregate fine sand fractions, that allows to reduce the consumption of expensive cement and used as a binder liquid glass and a small quantity of gypsum as a binder, as well as to prevent shrinkage of the mixture during its hardening.

Table 1.
The results of research strength multicomponent filling mixture.
№№ p/pSolid components of the filling mixture in % by weight of filler (substandard sand)The liquid binder componentsThe ratio of liquid and solid componentsThe density of the mixture ρ,
kg/m3
Temporary compression resistance RSG, MPa
The sandGypsumCement M300Iron ore "paint"Liquid glass ρ=1300 kg/m3The flocculant solution, in % by weight of liquid glass density28 days, 100% strength4 with the current, 40% of final strength (28 days)
1+111+60,2217208534
2+021+40,2216307932
3+151+00,2119009036

1. Hardening filling mixture including a filler, sodium liquid glass, plaster, cement, characterized in that in filling the mixture is further added flocculant, martite-hematite iron ore with a ratio of mixture components:
liquid glass sodium 20-22%;
cement 1-2%;
gypsum 1-2%;
the flock is and 0,002-0,004%;
iron ore, martite-hematite 1%;
the aggregate else.

2. Hardening filling mixture according to claim 1, characterized in that as a filler it contains substandard quarry sand with fineness modulus less than 0.7.



 

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