SU836368A1 - Filling-in composition - Google Patents

Description

(54) MOLDING COMPOSITION

The invention relates to the field of mining and can be used in the development of mineral deposits with the laying of the goaf. The composition of the filling mixture is known, containing cement, ground granulated slag, sand and water 1. The disadvantage of such a mixture is the high cost and insufficient strength of the filling mass. In addition, the composition of the filling mix is known, containing crystalline and granulated ground slags with a specific surface area of more than 2500, an activating additive (caustic soda), aggregate (enrichment waste with a modulus of 0.714 mm) and water at a 1: 3 ratio of tare and aggregate and water content providing a 10 cm cone immersion {2J: The disadvantage of this mixture is the lower strength of the filling mass (30 kgf / cm for 90 days). The purpose of the present invention is to increase the strength of the filling mass. This is confirmed by the fact that the composition contains anhydrite as an activating additive, and crystalline slag of a fraction of 0.14-40 mm in the following ratio of components, w / w: Crystalline ground slag 7.4-17.6 Granulated ground Slag 3.4-5.8 Anhydrite 0.3-0.7 Crystal slag fraction, mm 0.14-527.5-33.6 5-4044.5-45.6 Water 6.7-6.9 In this case, activation The process of hydration of ground crystalline slag occurs due to the addition of granulated (vitreous) ground slag to it. The vitreous slags have a large supply of internal energy and an active structure, and the benthora is the causative agent of the crystalline structure of the slag. The process of activating the minerals of the crystalline slag in the proposed mixture is further accelerated by using in its composition in the binder and aggregates homogeneous in chemical composition, for example, blast furnace slag.

This happens in such a way that, along with homogeneous in chemical composition, the components of the mixture (in the filling and filler), enhanced adhesion bonds are established, which create additional close contacts between them.

The presence of additional contacts between the aggregate and the host accelerates the process of slag curing, and, consequently, increases the strength of the filling mass.

It has been established that the deeper the accretion to the merger with the aggregate occurs, the higher the strength of the mixture.

In order to create close contacts between the aggregate and the existing in the proposed dare, the granulometric composition and properties of the filling mixture are regulated.

22.5

10.7

As follows from the table, the mixture containing the cement and ground granulated slag in the form of cement and natural aggregates has a compressive strength at the age of 28 days from 14.2 to 58.0 kg / cm and at the age of 90 days - from 15 to 66 , 0 kg / cm.

The mixture described in this specification, which includes slag of 2 modifications (vitreous and crystalline), SagO (anhydrite) and slag aggregates, has an increase in strength characteristics:

at the age of 28 days 82.8-126.1 kg / cm ", at the age of 90 days 110.6-158.4 kg / cm

Increasing the content of granulated ground slag in a mixture of more than 5.8% increases the strength of the array, but also increases the cost of the mixture, which may be irrational under the specific conditions of use of the mixture. .

A decrease in the content in the mixture of granulated crushed ground less than 3.4 leads to a decrease in the strength of the array.

cue composition of slags in the form of fine milled particles, which play a role in a twitch and relatively large particles in the form of a filler.

Since the intergrowth between the placeholder

and in the trap occurs for a long time, then the increase in the strength of the mixture is observed gradually over a long period. This eliminates the rapid heat dissipation in the initial setting of the mixture.

The table shows for comparison the strength characteristics of the compositions of the backfill mixture using cement and on the basis of ground and unmilled crystalline clay, which is used with a certain ratio of aggregate fractions .58, 0 66.0

14.7

44.9

39.0 15.0 158.4 i 17.2

1 10.7

The optimal composition should; read the composition, weight. %:

Crystal ground shlak12,5

Granulated ground shlak4,5

Anhydrite 0.5

Crystalline slag fraction, mm

0.14-530.6

5-4045.1

Water6,8

The use of this mixture will allow the use (disposal) of waste from the production of metallurgical industry and increase the strength of the filling mass.

Claims (2)

1. Kravchenko V.P., Kulikov V.V. Application of hardening bookmarks in the development of ore deposits. M., “Nedra, 1974, p. 81. 2. Tsigalov M.N. and others. Monolithic HKhkla on the basis of waste slag blast furnace. Lime University “Mining Journal, 1977, № 12, p. 10-11.