SU1291571A1 - Raw mixture for producing light-weight aggregate - Google Patents

Abstract

The invention relates to the production of building materials and can be used for the manufacture of lightweight aggregate. To increase strength and reduce water absorption of the aggregate, the raw material mixture, including clay raw material, 88–97.5 wt.%, Contains an additive from aluminum pickling agent in an amount of 2.5–12 wt.%. 1 tab. ke co wore sj

Description

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The invention relates to the production of building materials and can be used for the manufacture of lightweight aggregate.

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

Raw mix for the manufacture of lightweight aggregate includes clay raw materials and additives from aluminum waste, and as an additive it contains aluminum pickling waste in the following ratio of components, masd:

Clay raw material 88-97,5

Pickling waste

aluminum 2.5-12

Pickling waste and aluminum alloys are aluminate-saline solution and contain monosodium aluminate in small amounts of 11 HjO.

 and

The content of the components of the raw mix, May,%

clay raw materials

(dry) 88

aluminum pickling waste (dry)

12

aluminum alloy production waste

Properties of lightweight aggregate (expanded clay)

287280250340

5.95.5 8.510.5

5.26.5 4.82.9

0.05 0; 05 0.040.07

Waste contains in its composition the following components, -may,%:

44,2-46

38.0-40.2

1,7-i; 8

1.0-2.3

0.01-0.05

0.01-0.07

0.1-0.21

0.3-0.21

0.2-0.31

Rest

A1.0,

WITH

Fe

Ni

Zn

Mn

Cr

Water

20

Wastes are dark brown with a moisture content of 60%, 5 soluble in water.

The preparation of the raw mix, granulation and roasting are carried out according to the usual technology for the production of expanded clay.

Examples of the proposed and known compositions of the mixture and the properties of haydite are given in the table.

91 97.5

85

2.5

15

The increase in aggregate strength is due to the fact that the additive contains sodium hydroxide, which forms a low-melting vitreous phase of sodium silicate at 750-800 ° C, followed by the formation of fusible eutectic silicate of iron oxide at SOOO with, In this phase, the remaining components of the mixture are dissolved imparting water resistance to it, Due to the presence of sodium hydroxide in addition, the amount of pyroplastic mass in claydite increases significantly, which increases the content of the vitreous phase and, accordingly, the strength the first filler - expanded clay. Simultaneously with the formation of the vitreous phase and the dissolution of the indicated oxides in it, saturation of the vitreous phase occurs and minerals such as nifelin, sodium feldspar and spy N.Gunko 1169/27 crystallize out of it.

Compiled by B. Obraztsov Tehred L. Oleinik,

Circulation 588 VGOSHPI State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d, 4/5

Cor Pod

Production and printing company, Uzhgorod, st. Project, 4

Neli, which also increase the strength of expanded clay.

The proposed raw mix can be used in the production of lightweight aggregates.

Claims (1)

Invention Formula Raw mixture for the manufacture of lightweight aggregate, which includes clay raw materials and additives from aluminum wastes, characterized in that, in order to increase strength and reduce water absorption of the aggregate, it contains as an additive aluminum etching wastes in the following ratio, wt. %: Clayey 88,0-97,5 Pickling waste aluminum 2.5-12.0 Proofreader C, Shekmar Subscription