SU785262A1 - Raw mixture for making construction articles - Google Patents

Description

The invention relates to silicate materials and can be used in the building materials industry. The known raw material mixture for the manufacture of building bricks, including the components at the following ratio, wt%: Dehydrated clay 5-4 O Hydrated nepheline sludge, SO-8O. Nepheline slime. with a modulus of particle size of 1.5-2.5 Else llj Hydration of nepheline sludge is carried out by grinding it with water at B / T2: 0.5-3 in a ball mill, followed by steaming, or autoclaving or holding for 0.5-5 days at 15-25 C. The hydrated nepheline gaps are mixed with pre-dehydrated in the range from 500 to clay and nepheline slime with a modulus of 1.5-2.5, bringing the moisture content of the charge to a value equal to 8-16%. After mixing all the components, the mixture is evaporated, if necessary, and then brought to the desired molding moisture. The products are made by semi-dry pressing under pressure of 15О-400 kgf / cm. Immediately after pressing, the molded products (bricks) are water-resistant, do not require further autoclaving or high-temperature firing. The strength of the products gradually increases under operating conditions. A disadvantage of the known raw material mixture is a significant shrinkage of the molded products (bricks) caused by the continuing process of condensation of hydrated sludge and sludge of natural granulation under the conditions of operation of the products, which leads to cracking. In addition, products molded from a known mixture, in the initial period after pressing, have low flexibile strength.

Closest to the preferred one is the raw material mixture for the construction industry. products including nepheline sludge, asbestos and silica-containing component 2.

The disadvantage of the mixture is that the products of it have not enough high crack resistance and bending strength.

The purpose of the invention is to increase the crack resistance of the products and their bending strength.

The goal is achieved by the fact that the raw material mixture for the manufacture of building products, including nepheline sludge, asbestos and silica, contains a nepheline sludge hydrated and additionally A (5O) s in the following ratio of components, wt.%: Nepheline hydrate slime 40-80

Asbestos 5-10

AE; L (SQ4) 1-10

Silica-containing component Else.

The nepheline sludge is hydrated by grinding it with water at B / T 0.5-5-5 in a ball mill, followed by steaming, or autoclaving or holding the slurry for 0.5-5 days at 15-25 C.

In the process of slurry hydration, for example, after grinding, asbestos and ($ O) are introduced. A mixture of hydratized nepheline sludge and asbestos is mixed with the silica-containing component, the humidity of the resulting mixture is adjusted to a value of 10-18 wt.%. The products are made by pressing, rolling, tamping, pressing and other materials, which allow to exert pressure on the mixture, which ensures that immediately after pressing the material with the desired properties. The products obtained from such mixtures have a high bending strength, resistance to cracking and reduced shrinkage of products.

An increase in flexural strength, fracture cracks and reduced shrinkage of products is associated with the deepening of the process of hydration of nepheline sludge in the presence of At (5Ci) j, as well as with the formation of calcium sulfate and fibrous calcium sulfate aluminates, which have a widening effect and the role of additional reinforcement.

785262

The raw material mixture is illustrated by the following specific examples of its composition by weight:

Example. Nepheline mud

hydrated40

Asbestos10

At, (SO) 5

Silica component45

(the breed burned)

11 l of this 8000 g (40 wt.%) Nepheline sludge from the Achinsk alumina refinery and 1000 g (5 wt.% UAb, ($ OA) 2 are mixed with water for 2 hours until they pass completely through SI1O 008. The resultant the mass is mixed with 2000 g (10 wt.%) of asbestos varieties K-6 and 9OOO g (45 wt.%) of crushed burnt rock with a size of 1.8, and the mixture is subjected to steaming at 2 + 4 + 2. This mixture is dried to a moisture content of 14 wt.%, i is dispersed by wiping through a sieve with a size of 1 with 5 mg and formed from it samples with a diameter of .50 mm and a height of 50 mm, which are laid in different directions. test m.

The test results are presented in Table. one,.

Example 2. Nepheline sludge hydrated in Asbestos .5 Aed (504) c 10 Silica-containing component (sistof) 5 For this, 8000 g (80 wt.%) Nepheline sludge from the Achinsk alumina refinery and 1OOO g (1 wt.%) mixed with water at 5 for 2 hours until complete passage through a sieve 008. The resulting mass is mixed with 50O g (5 wt.%) asbestos and 500 g (5 wt.%) sishtoph and the mixture is subjected to autoclaving with continuous stirring at a pressure of 4 ATI mode 2 + 3 + 2. The resulting mixture is dried to a moisture content of 18 wt.%, Dispersed by wiping through a sieve With a cell size of 2.5 mm and f (fmuyut the same samples as in example 1.

The test results are presented in Table. one.

PRI me R 3. Nepheline hydrated sludge60

Asbestos7 Aea. (304) s Silicon-emitting Component (clay shale battle) For this, 600O g (60 wt.%) Nepholithic Slime and 10O g (1 wt.%) L.)} Mixed with water at. V / TG in a ball mill for 2 hours until complete passage through a 008 sieve, after which 700 g (7 wt.%) Of dissolved asbestos is added to the mass, kept under continuous stirring for 24 hours. at -0 2Qt5 C, mixed with 32OO g (32 weights of clay bricks of a fraction of 0.5-2.5 mm. The mixture obtained is dried to a moisture content of 16 wt.%, dispersed by wiping through a sieve with a size of 5 mm and forming the same The samples, as in example 1. The results of the tests are presented in Table D. All the samples immediately after forming had water resistance. When storing the samples in natural conditions and water, their strength increases. After boiling the samples, no cracks were observed. from the proposed mixture is molded at a pressure of 40 MPa samples 4x4x16 cm pills that are autoclaved under the 3 + 6-b regime 2. Six samples of the mixture of each particular composition are tested for bending and compression at the autoclave humidity, and six others are dried in a drying cabinet according to the regime: one day at and two days at. The assessment of the crack resistance of products is based on the fact that surface and internal cracks that occur during the drying of specimens, first of all, affect their flexural strength and show little compression specimens. In connection with, as a criterion for evaluating the treshine resistance, the following relation has been adopted, .. Y .. GmZg.Lszh / pvL. mzg. / th The results of testing samples from the proposed mixture and the mixture "by source f2j are presented in Table 2.

Table 2

 Nepheline mud

hydrated 4O

, Asbest10

AP (S04) 35

Silica-containing component (rock burned) 45

2. Nepheline spirami hydrated 80

Asbestos5

Ar, {$ 04) h10

Silica containing component (sishtof) 5

.Neptiline slurry

Asbestos Aez, (50d) h

 one

Silica containing component (clay brick battle) -32

.Neplet sludge - 85 Asbestos

Silica-containing component

(sishtof) (source 2)

-40

Nepheline mud

-25 16.2 Asbestos

Kremneyemsoder-35 gkashy component (burned rock) by source, 0 55,220,75 70,2

0.96

0.92

ZO 45 45.4

28,172,5

0.88

2O, 45 39.3

27 „9

16.5

0.75

13,128,4

19.7

12.2

0.81

30.8

Claims (2)

21,418,9 Claims of the invention The raw material mixture for the manufacture of construction products, including nepheline sludge, asbestos D1 is a silica-containing component, characterized in that, in order to increase the cracking resistance of the products and their bending strength, it contains nepheline sludge in the following ratio of components, wt.%: Nepheline sludge 40-80 Hydrated asbestos 5-10. Aej (SQ4) j1-10 Silica-containing componentOther. Sources of information taken into account in the examination 1. - The copyright certificate number 587123, CP. From 04 To 15/08, 1976 2. Author's certificate under ve. N9 2588129 / 29-33, / i. From 04/15/15, 03/07/78.