SU990723A1 - Raw mix for making silica products - Google Patents

Description

The invention relates to the building materials industry and can be used in the manufacture of silicate products.

From: a known raw material mixture for the manufacture of silicate products, including ground nepheline mud and quartz sand in a ratio of 1: 3 11

Closest to the technical essence of the invention is the raw material mixture for the manufacture of silicate products, including, wt.%: Hydrated nepheline sludge 30-80, dehydrated clay 5-40 and nepheline sludge with a grain size of 1.5-2.5 the rest of t2.

The disadvantages of the known mixtures are high water absorption and insufficient frost resistance.

The purpose of the invention is to reduce water absorption and increase frost-. bones.

This goal is achieved by the fact that the raw mix for the manufacture of silicate products, including hydrated nepheline sludge and aggregate, contains rehydrated as a filler, 50-90% nepheline sludge with oil-x;

the following ratio of KC components, wt.%:

Hydrated nepheline sludge 50-75 50-90% rehydrated nepheline sludge 25-50 Rehydrated nepheline sludge is a preliminary but hydrated nepheline sludge M, dewatered at 600,800 ° C to remove chemically bound water within 50-90%. The nepheline sludge is hydrated by wet grinding in a ball mill at a / T of 0.5-3, followed by steaming or autoclaving at 173 ° C and 8 atm or keeping for 0.5-5 days at 2020.

The ratio of phases in hydrated nepheline sludge,%: hydrosilicate of the CSH (II) type, plombierite 1025 15 and ot-C2S hydrate 10-15.

Phase ratio in rehydrated nepheline sludge,%: Amorphous hydrosilicate of the type CSH (Il) 6570; wollastonite 20-30 and plombierite

Claims (3)

30 5-10. The listed phases are unstable in structure and in part in chemical composition, i.e. have the greatest internal energy. In accordance with the principles of the ordering effect of the structure of silicate substances, in this state the products of hydration and the registration of nepheline sludge are prone to contact hardening, i.e. the formation of water-resistant stone immediately after dispersion is lowered. The presence of anhydrous phases leads to additional compaction of the stone due to their hydration in cramped conditions, which, in general, contributes to the achievement of the goal. The raw mix contains active aggregate - partially rehydrated nepheline sludge. The removal of a significant part of chemically bound water in hydrated nepheline sludge occurs in the range of 600-800 ° C, which is accompanied by disruption of the structure of the substance and its transfer to the most active state, which is manifested during petrification by contact-condensation and hydration-condensation schemes. Partially dehydrated hydrosilicates. Rock, qi exhibit the ability to harden both by creating contacts between particles and by hydration, i.e. attach missing water. In the process of moistening the mixture and pressing the products, structural bonds are formed in the material that are resistant to the destructive effect of water due to the presence of calcium hydrosilicates of an unstable structure. At the same time, hydrated hydrates hydrate, which is accompanied by an increase in phase volume and, therefore, compaction of the material. As a result, its water absorption is reduced. Example 1. A mixture of the following composition is prepared, wt%: hydrated nepheline sludge 75 and rehydrated nepheline sludge 25. To do this, the nepheline sludge from the Achinsk alumina plant is mixed with water at B / T-1.0 in a ball mill for 2 hours before passing through a 008 sieve and subjected to actogenesis according to the 1.5 + 6 + 2 mode at 173 ° C and 8 atm, after which the degree of hydration is 19-22%. A portion of the hydrated nepheline sludge is dehydrated in a muffle furnace at 600 ° C for 2 hours. The removal of chemically bound water is 50%, 2000 g (25% by weight) of the obtained rehydrated nepheline sludge is mixed with 6000 g (75% by weight) the remaining hydrated nepheline sludge is uniformly homogeneous mass, which is brought by drying to a moisture content of 8-10%, dispersed by wiping; sieve with size. 5 mm cells and molded from it under a pressure of 40 MPa samples with a diameter of 50 mm and a height of 50 mm, which are then subjected to various tests. Example 2. In a similar way as in Example 1, a mixture is prepared containing 50% by weight of hydrated nepheline sludge and 50% by weight of rehydrated nepheline sludge. As in Example 1, samples were made. Example 3. In a similar way as in example 2, a mixture is prepared containing 70% by weight of hydrated nepheline sludge and 30% by weight of rehydrated nepheline sludge. In the same way as in example 2 samples are prepared. The test results of the samples are shown in the table. 79 Formula for manufacturing Raw materials for the manufacture of silicate products, including hydrated nepheline sludge sludge and aggregate, characterized in that, in order to reduce water absorption and increase frost resistance, it contains 50% -90% nepheline sludge rehydrated at the following ratio of components, weight ,%: Hydrated nepheline sludge 50-75 90723 8 Nepheline sludge rehydrated by 50-90% 25-50 sources of information, „„ into account during examination c1, Bozhenov PI Complex use of mineral raw materials for the production of building materials. 0 L.-M., 1963, p. 56. 2, USSR Author's Certificate No. 587123, cl. From 04 To 15/08, 1976.