CS240357B1 - Mixed water glass coagulator - Google Patents

Abstract

The mixed water glass coagulator for the preparation of silicate and clay silicate injection mixtures consists in that it is formed as an aqueous solution of citric acid and ferrous, ferric, or aluminum salts of mineral acid. According to the above solution, the aqueous solution of the mixed coagulator as a water glass reagent contains 0.3 to 15 g. l"* l citric acid and 6 to 30 g. l-1 of ferrous, ferric, or aluminum salts of mineral acid.

Description

SUMMARY OF THE INVENTION The present invention relates to mixed waterglass coagulators for the preparation of silicate and ellosilicate injectable compositions at the construction site.

In injection molding operations, injection mixtures prepared as aqueous suspensions of cements with additives that increase their stability, resistance to aggressive water and the like have been introduced. Examples of such materials are bentonite and fly ash.

Water-based chemical mixtures are used to increase the tightness of injected rocks and soils, or to accelerate the solidification process. A wide variety of inorganic and organic coagulants can be used to prepare the silicate injectables, as described in the patent and technical literature. At present, a large number of coagulants are known which are capable of inducing the conversion of a colloidal water glass solution into a silica gel at a given time. Such substances include inorganic and organic acids such as hydrochloric, sulfuric, nitric, phosphoric, citric, oxalate, boric. Furthermore, salts of these acids such as calcium chloride, ferrous sulfate, sodium phosphate acid, copper sulfate, sodium carbonate carbonate, sodium aluminate, sodium hexametaphosphate, formamide, ethyl acetate, butyl acetate

The disadvantages of the ingredients used so far are either the poor quality of the gels produced, or their manufacturing, health or fire safety problems. So eg. mineral acids are corrosive, formamide releases ammonia in the reaction, ethyl acetate is flammable, copper salts form toxic solutions. Many coagulators do not suit! the requirement of ecological safety in relation to groundwater and surface waters.

It has been found that the quality of the silica gel is dependent on the coagulant used. The coagulation solution chemicals must comply with the above-mentioned health, fire and environmental safety requirements. Experimental work has shown that gels with good quality parameters also meet ecological requirements, provided that the coagulator itself is not a flammable substance and is not harmful to health.

The above drawbacks do not have a mixed water glass coagulator for the preparation of the silicate and silosilicate injectable compositions of the invention, which is prepared as an aqueous solution of citric acid and ferric, ferric, or aluminum salts of mineral acids at a suitable concentration of the individual components. Each component of the mixed coagulator has its specific properties, with the effect of multiplying their effect in the qualitative parameters of the resulting gels in common. With this new chemical reagent assembly, the gel formed exhibits high shear strength and bulk stability over a wide range of coagulation times.

The invention is illustrated in more detail in the following examples.

Example 1

reactive:

750 1 water kg citric acid 8 kg ferric or ferric chloride

Water glass:

350 kg, modules 3.2 to 3.5

Silicate mixture:

000 1

Example 2

Water glass:

350 kg, modules 3.2 to 3.5

750 1 water kg citric acid kg ferrous or ferric sulphate

1000 1

Example 3

reactive:

750 I Conscious kg Citric acid kg Aluminum sulphate

Water Glass:

350 kgj mdddl 3,2 to 3,5

1000 1

attaches

reactive:

846 1 water 50 kg bentonite kg citric acid 9 kg aluminum sulphate

Water glass:

200 kg water glass with modulus 3.2 to 3.5 clay silicate mixture:

000 1

The injectable mixture of the Examples is prepared by mixing the reactive with the aqueous ski resin in any sequence with vigorous stirring of the mixture. The reactant is prepared by dissolving the solids in water at the prescribed ratios. The dissolution of the substances is accelerated and the solution is homogenized by vigorous stirring. For silicate mixtures, the clay component is mixed in water before the chemicals are added, or the clay component suspension is added to the silicate mixture in a prescribed ratio.

In the examples of use, silicate and silica silicate injectable mixtures having coagulation times of 3 to 6 hours were prepared. a shear strength of 2 to 4.5 kPa and a syneresis of 0 to 0.5% for 24 hours.

Silicate and silosilicate injectable compositions can be prepared in a relatively wide range of components of the reactive, waterglass and clays according to the requirements of the quality parameters of the resulting gel.

Claims (1)

240357 The injection mixture of the Examples is prepared by mixing the reactive with an aqueous ski in any sequence with intensive mixing of the mixture. The reactant is prepared by dissolving the solid particles in water in the prescribed proportions. The dissolution of the lithium is accelerated and the solution is homogenized by intensive mixing. In the case of silicone mixtures, the clay component is mixed in water prior to the addition of chemicals, or the suspension of the clay component is added to the silicate mixture at a prescribed ratio. In the examples of use, the prepared silicate and olea silicate injection mixtures with coagulation times of 3 to 6 hours with a shear strength of 2 to 4.5 kPa and a syneresis of 0 to 0.5% for 24 hours. Silicate and silosilicate injection mixtures can be prepared in relatively wide range of reactive, waterglass and clay substrates with the resultant qualitative gel parameters. SUBSTANCE Mixed aqueous glass coagulator for the preparation of silicate and silicate silicate injection mixtures in a building site, characterized in that it is formed by an aqueous solution of citric acid] and ferrous, ferric, or discharged aluminum salts of mineral acid, wherein the solution contains 0.3 to 15 gh -1 citric acid] and 6 to 30 g. I "1 ferrous, ferrous, or mineral salt of mineral] acid.