RU2317959C2 - Binder and method of production of such binder - Google Patents

Abstract

FIELD: manufacture of building materials; production of binders.

SUBSTANCE: proposed binder mixed preliminarily with activated water at pH of 11.0-11.5 contains the following components, mass-%: caustic alkali, 4-6; expanded clay aggregate powder, 16-18; hemihydrated calcium sulfate, 4-6; the remainder being ground glass. Proposed method includes joint grinding of ground glass, expanded clay aggregate powder and hemihydrated calcium sulfate and mixing with activated water with caustic alkali dissolved in it.

EFFECT: reduced consumption of pure alkali component at retained high physico-mechanical parameters.

3 cl, 2 tbl

Description

The invention relates to the production of building materials and can be used to obtain a binder.

The closest technical solution to the proposed one is a binder, including, wt.%: Caustic alkali - 7.0-9.0, ground expanded clay - 15.0-17.0, semi-aqueous calcium sulfate - 3.5-4.5, organosilicon liquid - 0.04-0.05, ground glass - the rest, and a method for its production, including co-grinding ground glass, ground expanded clay and semi-aqueous calcium sulfate and the subsequent introduction of an aqueous solution of caustic soda and organosilicon liquid (RU 2081073, IPC 6 С04В 7 / 00, published on 06/10/1997).

The disadvantage of this method is the use of expensive chemically pure caustic soda when receiving a binder.

The technical result consists in reducing the cost of obtaining a binder by reducing the consumption of pure alkaline component while maintaining high physical and mechanical properties.

The essence lies in the fact that the binder, including ground glass, caustic alkali, expanded clay powder, hemi-calcium calcium sulfate, sealed with water, contains these components in the following ratio, wt.%:

Caustic alkali 4-6 Expanded clay powder 16-18 Semi-aquatic calcium sulfate 4-6 Ground glass Rest

and as water use pre-activated water with a pH from 11.0 to 11.5.

A method of producing a binder involves the joint grinding of ground glass, expanded clay powder and semi-aqueous calcium sulfate and mixing them with said water with caustic alkali dissolved in it.

To prepare the proposed binder composition, ground glass is used, which is obtained from glass breakage of lamp production, the chemical composition of which varies in the following limits SiO ₂ - 68.5-72.9; Na ₂ O - 11.9-16.7; K ₂ O - 1.2-3.8; CaO - 5.0-6.0; BaO - 2.2-5.5; MgO - 3.2-3.8; Fe ₂ SO ₃ - 0.1-0.12; Al ₂ O ₃ - 1.0-1.5.

The chemical composition of expanded clay powder is as follows,%: SiO ₂ - 65-75; Na ₂ O + K ₂ O - 0.5-1.5; CaO - 0.5-3; MgO - 0.3-2; Fe ₂ SO ₃ + FeO - 2.5-9.5; Al ₂ O ₃ - 17.0-23.0.

Technical caustic soda is used as caustic alkali, meeting the requirements of GOST 2263-71.

Semi-aquatic calcium sulfate must meet the requirements of GOST 125-79.

To mix the binder, use activated water with a pH of 11-11.5. The level of alkalinity of water is increased by the electrochemical method in the electrolyzer using electrodes having unlike electric charges.

The technology for preparing components for a binder is as follows.

Ground glass preparation. The battle of incandescent lamps is passed through an electromagnetic separator, in which the separation of metal inclusions is carried out. The remaining glass phase is crushed to a particle size of less than 5 mm. The crushed mass is dried in a drying drum and subjected to grinding in a ball mill. The ground glass is sieved on a screen through a sieve with holes of 0.14 mm and fed into a storage hopper. Particles larger than 0.14 mm are returned to the ball mill for domol.

Preparation of expanded clay powder. When using screenings of expanded clay with a particle size of not more than 5 mm, the mass immediately enters the dryer drum and then to the ball mill. In the event that the particle size exceeds 5 mm, at the first stage they are crushed in a hammer mill. The crushed mineral additive is sieved through a sieve with a hole size of 0.14 mm and fed into the storage hopper. Particles larger than 0.14 mm are returned to the ball mill for domol.

At the next stage, the dosed amount of pre-prepared ground glass, aluminosilicate component and semi-aqueous calcium sulfate are subjected to additional joint grinding to a specific surface area of 3500-4000 cm ² / g.

Mixing of the binder is carried out with pre-activated water with a pH of 11 ÷ 11.5 with sodium hydroxide dissolved in it. With a lower value of the level of the hydrogen index of the mixing water, the efficiency of its use decreases due to the need to increase the content of pure caustic alkali in the mixture. It is difficult to achieve a higher pH level using the electroactivation technology described above (without using any additives that increase the cost of the process).

The resulting mixture is placed in molds and compacted by vibration or pressing. The formed samples are cured one day under normal conditions, and then in a steaming chamber at a temperature of 90 ° C.

The binder compositions are given in table 1 of the appendix. The amount of water is 28% by weight of the dry components.

The compressive strength of the samples is presented in table 2 of the application.

As can be seen from table 1 and 2, the proposed binder composition has the strength characteristics similar to the prototype with a consumption of pure caustic soda reduced by 1.5-2 times and, as a result, the reduced cost of obtaining the binder.

Table 1. Structure The content of components, wt.% Mixing water with a pH of 10.0 Mixing water with a pH of 10.5 Mixing water with a pH of 11.0 Mixing water with a pH of 11.5 Prototype one 2 3 four 5 6 7 8 9 10 eleven 12 13 fourteen fifteen 16 Caustic alkali four 5 6 7 four 5 6 7 four 5 6 7 four 5 6 7 9 Expanded clay powder fifteen 16 17 eighteen fifteen 16 17 eighteen fifteen 16 17 eighteen fifteen 16 17 eighteen 17 Semi-aquatic calcium sulfate four 4,5 5 6 four 4,5 5 6 four 4,5 5 6 four 4,5 5 6 4,5 Organosilicon liquid - - - - - - - - - - - - - - - - 0.05 Ground glass 77.0 74.5 72.0 69.0 77.0 74.5 72.0 69.0 77.0 74.5 72.0 69.0 77.0 74.5 72.0 69.0 69.45 Table 2. The name of indicators The value of indicators one 2 3 four 5 6 7 8 9 10 eleven 12 13 fourteen fifteen 16 Prototype Compressive strength, MPa 4.9 6.0 8.1 10.3 6.0 7.3 11,2 13.1 7.5 10.1 14.7 16,0 8.0 11.0 17.0 16.5 15.3

Claims (2)

1. An astringent, including ground glass, caustic alkali, expanded clay powder and semi-aqueous calcium sulfate, sealed with water, characterized in that it contains these components in the following ratio, wt.%: Caustic alkali 4-6 Expanded clay powder 16-18 Semi-aquatic calcium sulfate 4-6 Ground glass Rest, and as water use pre-activated water with a pH from 11.0 to 11.5. 2. The method of producing a binder according to claim 1, including the joint grinding of ground glass, expanded clay powder and semi-aqueous calcium sulfate and mixing them with specified water with caustic alkali dissolved in it.