SU814953A1 - Raw mixture for producing ligh-weight refractory concrete - Google Patents

Description

The invention relates to the building materials industry and can be used for the manufacture of lightweight refractory concrete with a phosphate binder.

Raw mixtures are known for the production of a phosphate binder based refractory material that contain bauxite, refractory clay, aluminum hydroxide, and phosphoric acid [1].

A disadvantage of the known raw material mixtures is their low strength at high temperatures.

Closest to the proposed ¹ is a raw material mixture for the manufacture of lightweight refractory concrete, including phosphate binder 1540%, porous phosphate aggregate 10-50% and corundum aggregate from ^J corundum grains 30-60% [2].

The disadvantages of the known raw material mixture are an increase in the volume of products obtained at high temperatures due to gas evolution of phosphoric anhydride and reduced strength after firing at 1500 C.

The purpose of the invention is to reduce the volume expansion and increase the strength after firing at 1500 ° C.

The goal is achieved in that the raw material mixture for the manufacture! light refractory concrete, including phosphate binder, porous phosphate aggregate and corundum aggregate, contains corundum aggregate sandblasting waste metal corundum fractions 60-140 μm and additionally refractory clay in the following ratio of components, wt.%:

Porous phosphate aggregate 14-17

Sandblasting Waste Electrocorundum Metal Surface 53-63

Refractory clay 10-12

Phosphate Binder Else

The technical effect of the compositions of the proposed raw material mixtures is achieved due to the participation of metal processing particles and refractory clay in the formation at high temperature of a strong ceramic bond in the volume of the material.

Example. The proposed compositions are prepared by thoroughly mixing orthophosphoric acid or alumochromophosphate binder, porous phosphate aggregate, refractory clay and sandblasting waste. electrocorundum of the metal surface, after which the prepared mixture is placed into molds and heat treated at 300 ° C. from

Sandblasting waste by electrocorundum of a metal surface has the following chemical composition, wt.%: A1 _g 0 ^ 99.2; S10 _g 0.25; Na ^ O - 0.3; the total content of oxides is 10 TiO ₂ , Fe ^ O ^, CaO 0.25.

The ratio of components and properties of the resulting material are given in the table.

Components and Features The ratio of components and the value of the property index,% for compositions 1 2 3

Phosphoric acid thirteen - - Alumochromophosphate Binder - 18 fifteen Porous phosphate aggregate 14 17 fifteen thirty Sandblasting waste with electrocorundum metal surface 63 53 -59 35 Fire-clay 10 12 eleven Expansion after firing at 1500 ° C 0.1 0,0 0,0 40 The compressive strength after firing at 1500 ° C MPa 12 10 10

From a comparison of the indicators of the properties of expansion and strength of the proposed compositions and the known one for which they are respectively + 2.1% and 6.0 MPa, the advantage of the proposed ones is seen (a decrease in the expansion of the material by 2% and an increase in strength by 2 times). This makes it possible to reduce the time of broiling kilns to working temperatures by 1.2 times and to increase their life by 2 times.

Claims (2)

veil filler, refractory head and sandblasting waste electrically round the metal surface, after which the pigmented mixture is placed in molds and heat treated at. The waste sandblasting electrocorundum metal surface have the following chemical composition, wt.%: D1, 2; SiOj, 0.25; Na, jO 0.3; the total content of oxides of TiOg, Cao 0.25. The ratio of components and properties of the resulting material are shown in the table. Component ratio size by components and properties of coater properties,% for compositions Phosphoric acid 13 Alumochromophosphate 18 15 binder Porous phosphate 17 15 aggregate Sandblasting waste with electrocorundum of surface 53 -59 metal 12 11 Refractory clay Expansion after roasting at 1500 ° С 0.1 0, 0 0.0 Compressive strength after calcination at mPa 12 10 10 From a comparison of the indicators of the expansion properties and the strength of the proposed compositions and the known, for which they are respectively + 2.1% and 6.0 mPa, the advantage is Guy (decrease spreading material on a 2% increase in strength and a factor of 2). This makes it possible to reduce the time of brooding of kilns to operating temperatures by 1.2 times and increase their service life by 2 times. A raw material mixture for the manufacture of lightweight refractory concrete, including phosphate binder, porous phosphate filler and corundum filler, which, in order to reduce the volume expansion and increase the strength after calcination at a temperature of 1500 ° C, it contains corundum filler waste sandblasting electrocorundum metal surface fraction 60140. µm and additionally refractory clay in the following ratio of components, wt.%: Porous phosphate filler14-17 Sandblasting waste with metal surface electrocorundum53-63 Refractory clay 10-12 Phosphate binder Rest Sources of information taken into account during the examination 1.Patent of Great Britain 1066902 , cl. C 1 3, 1967, 2. Authors certificate of the USSR 480668, cl. From 04 To 29/02, 1973.