SU610819A1 - Method of manufacturing silicate articles - Google Patents

Description

(.54) METHOD FOR MANUFACTURING SILICATE PRODUCTS

The invention relates to a process for the manufacture of non-autoclaved silicate products and can be used in industry for the production of, for example, silicate bricks, tiles from nepheline sludge.

A known method for the manufacture of elicate products from nephelcic sludge with the addition of alkalis, lime and gypsum by mixing components, pressing and hydrothermal processing of products l.

The disadvantage of this method is the formation of -weaves on the surface of the products.

The closest to the invention to the technical essence and the achieved result is a method that includes mixing nepheline sludge with water, molding and heat-moisture treatment of products at atmospheric pressure.

The disadvantage of this method is low strength rolls of the obtained products, increased porosity and water absorption of the products, which prevents their use in conditions of alternate moistening.

2

The purpose of the invention is to increase the strength and reduce water absorption.

This goal is achieved by the fact that the products after heat and humidity 5 treatment are moistened to a relative humidity of 50-100% and sumat at 120280 ° C.

To achieve higher strength, the wetting and drying process is repeated several times.

In the process of repeated moistening and drying of products based on nepheline sludge, the amount of new formation that increases strength increases as well as the circulation of moisture, as well as the thermal stresses and water absorption decrease.

In the implementation of the method, nepheline galas are pre-ground to a specific surface of 3500-4500 cm7g and mixed with water. The resulting mass is molded, for example, by pressing under pressure up to 200 kg / cm -, and then subjected to heat and moisture treatment 5 at 280 ° C and atmospheric pressure. The heat treatment is carried out in tunnel dryers equipped with wetting and drying zones or in an autoclave, followed by wetting and drying at atmospheric pressure.

After cooling to 50-70 ° C, the products are soaked in water for 20 minutes to a relative humidity of 70% and dried in a vapor-air medium at 200 ° C for 3 hours. After cooling, the product is moistened to relative humidity. Autoclaving

mode 2 + 2 h

Claims (2)

Thermal moisture at atmospheric pressure and temperature of 280 ° C. The initial strength of the slurry brick and the degree of strength increase during the process of continuous wetting and drying depend on the storage duration of the nepheline yupam. The shorter the shelf life of the asham, the higher the strength of the brick. The brick of nepheline sludge made by the proposed method, unlike calc-silicate, is waterproof and can be used for laying foundations of buildings and for underwater structures, and the strength of the brick increases with time. Claims The method of making silicate from products, which includes mixing a 30% to 50% injectability and is sent to the finished goods warehouse. Processing modes and strength characteristics of products are presented in the table. 300 278 172 of feline sludge and water, molding and heat-moisture treatment of products / characterized in that, in order to increase strength and reduce absorption, the product after heat-moisture treatment is moistened to a relative humidity of 50-100% and dried at 120-280 ° C. Sources of information taken into account during the examination 1. Korneev v.i. other. Complex processing of nepheline sludge. M., stroiizdat, 1974, p.130. 2. For all 2158473/33, cl. From 04 to 15/06, 1975, according to which a decision was made to issue an author's certificate.