SU745879A1 - Method of binder production - Google Patents

Description

(54) METHOD FOR GETTING BINDER

one

This invention relates to the field of production of increased strength and water resistance based on gypsum and cement.

Known methods for the production of gypsum moulders provide for obtaining the desired product with high strength but with insufficient water resistance.

One of the closest to the present invention to the technical essence is the method of obtaining a binder, providing for the hydrothermal treatment of an aqueous suspension of gypsum raw material under pressure in the presence of a crystallization regulator of semi-aquatic gypsum C.

Obtained according to the indicated method) bincoBoe in a gangway possesses low vodostoykost.

The purpose of the invention is to eliminate this disadvantage.

The goal is achieved by the fact that Portland cement is introduced into the aqueous suspension of gypsum raw materials at a gypsum: Portland cement ratio of (2., 33-19): 1, and the resulting system is subjected to hydrothermal treatment under pressure in

the presence of a crystallization regulator for semi-aquatic gypsum.

Additionally, a pozzol 5 new additive can be added to the initial gypsum slurry at a gypsum: ptlandland: pozzolanic additive ratio of 1.33–18: 1: 1.

Example 1. Plaster raw materials and cement in the ratio (by weight)

 0.8: 0.2 is diluted with water to a ratio L / T of 0.8-1.2, and a semi-hydrate crystallization regulator, for example, a sulfonate, is added in the amount of 0.5% by weight of solids.

15 The resulting suspension is fed to the autoclave, where at a temperature of 130 ° C with continuous stirring, the dehydration of the gypsum raw material occurs, the hemihydrate crystallizes, the hydration

20 cement and the formation of products of the interaction of cement and calcium sulfate. Then, after dehydration of 90-100% of the 7th gypsum raw material, the suspension is fed to a vacuum filter, where

25 the solid phase is separated and fed for drying and partial grinding.

EXAMPLE 2 The main technological operations are carried out as in Example 1, but a pozzolanic additive is additionally added to the solid part of the suspension at a ratio (by weight) of gypsum raw material: cement: additive 0,8 0, 1: 0, one.

This method allows, for example, at a cement consumption of 10%, to obtain more than 300 brands with a softening coefficient of 0.6–0.7.

The extrusion obtained by the method described above can be used in the manufacture of a number of building elements TbV ammunition of more expensive Cement. n and e: NOTE

. Introduction of 3% of puc-57 tsolanovy cement in the process of cooking (roasting) gypsum in a gypsum cooking kettle.

Dehydration of gypsum raw materials under pressure, with mixing in an aqueous suspension, not containing additives 147

Dehydration of gypsum raw material in an aqueous suspension containing 5% pozzolan cement. Cement is introduced into the autoclave during hydrothermal treatment 151

Dehydration of gypsum raw material in an aqueous suspension containing 5% pozzolan cement. Cement introduced during slurry preparation (according to the invention) 156

In tab. 1 shows the change in the properties of the obtained by the proposed method in the shearer, depending on the ratio of the starting components,

In tab. 2 shows the properties of the binder depending on the method of its preparation.

This table shows that the obtained in the gnawing significantly exceeds the properties of the gnawing, prepared by various known methods.

Table 1

88

0.37

0.37

185

0.36

0.36

189

0.43

0.42

0.57

196

0.58 samples of 3x3x3 cm from material obtained by hydrothermal treatment under pressure in a liquid medium of a phosphogypsum suspension, Giant cement plant and tripoli were tested. Table 2,

Claims (1)

1. Author's Certificate of the USSR 307075, cl. From 04 To 1/04, 1970 (PROTOTYPE).