SU537979A1 - The method of obtaining claydite - Google Patents

Description

(54) METHOD OF OBTAINING KERAMZIT

one

The invention relates to the production of porous aapfillers for concretes and structures based on them.

There is a known method for preparing fillings for concretes with a protective coating on the surface of the finished granules formed in various ways: by running the finished clay with lime in an autoclave under pressure, by dusting raw granules with refractory materials or materials containing carbon, by applying aqueous suspensions of clay, by non-coating of of thermoplastic material in the fluidized bed to heated up to .700-100О С expanded clay granules

It is, however, impossible to obtain aggregates with sufficient strength properties using these methods.

The closest solution to the invention is a method for obtaining expanded clay, also enclosing in the molding of pellets, their roasting and ohlahsdenpi, but with additional processing of the surface of the pellets of the semifabpicate before roasting with phosphate solutions 2.

 However, along with increasing the strength of claydite gravel in this method I, the techno / juigical process of o6; jig is complicated when making sneakers from short-melting clay raw material (the temperature of onset is low).

; melting on C.

 The purpose of the invention is to increase the strength and the coefficient of structural quality by creating a compacted and hardened shell on the surface of the granules.

This is achieved by processing the granules of water} with the first phosphate solution after calcining at the initial stage of ox-t deposition at 1000-800 C.

 In contrast to the known methods, a reinforcing film-forming coating is applied to the surface of the expanded clay granules immediately after firing after they leave the rotary kiln at an early stage of cooling-sh at 1000-800:.

but

An increase in the yield is ensured by the formation of macro- and microcracks on the surface of the granules behind the sewing envelope (plenum) of the iioBepxHocTHbie that heals, this defects and cavities and

compressive stress in the surface layer.

The proposed method is carried out as follows.

The expanded clay granules obtained by the plastic method of preparing a nugget {) abrikat and heat treatment in existing roasting units, at the initial stage of cooling after leaving the rotary kiln at 1000-800 ° C, are sprayed with a solution of an aluminum-chromophosphate binder (spray gun), which provides film thickness mk.

Subsequent cooling of the expanded clay granules thus treated is carried out by known methods.

Example 1. Plastic-formed granules from the clay raw material of the Smyshlsky and Nikitshyuk deposit are heat-treated and fired in a laboratory cure, working

four

in the firing mode, corresponding to the mode in the manufacture of expanded clay under production conditions.

A portion of the granules with a temperature of 10OO-8OO C is sprayed with an atomizer solution, aluminum. chromophosphate (AHPS).

In order to form a thin film on the surface of an expanded clay granule, an aqueous solution of aluminum-chromophosphates is prepared in an ratio of 1: 2.

No other part of the granules are treated with the solution. It serves as a control when comparing the quality indicators of ceramsite (see table).

The data in the table indicate that the formation of a protective film of an aluminum-chromophosphate binder on the surface of the granules leads to an increase in the strength of claydite by a factor of 2-3.

Higher strength properties of the aggregate allow to obtain a significant economic effect when it is used. for manufacturing lightweight structures (reducing cement consumption, reducing the weight of the building and, accordingly, the foundation).