Refractory ramming mass for lining furnaces

 

(57) Abstract:

The inventive mass contains, in wt.%: the clay content of Al2O380-85% of natural bauxite - 55-65, korundsoderzhashchie component 16-20, refractory clay, 7-9, graphite - 7-12, phosphoric acid - 4-5. table 1.

The invention relates to refractory sub-sectors, namely, compositions ramming mass for lining furnaces. Known refractory ramming mass, including electro-fused corundum 70-85 wt. the dust captured their flue gases from rotary kilns during the firing of high alumina fireclay 2-10 wt. phosphoric acid 5-8 wt. refractory clay, 7.5 to 12 mass. (ed.St. N 1191441, class C 04 B 28/34, 1985). The disadvantage of this mass is its lack of slag.

Closest to the present invention is a refractory ramming mass, including high-alumina refractory fireclay 51-56 wt. corundum waste abrasive production 18-26 wt. refractory clay 7-12 wt. phosphoric acid 4-5 wt. graphite 7-12 wt. (ed.St. N 1076417, class C 04 B 33/22, 1984). The disadvantage of this mass is its high thermal conductivity, high degree of baking results the mass thickness of the lining, and therefore significant don is Amenemope raw materials.

The purpose of the invention is to reduce thermal conductivity and the degree of baking results the mass thickness of the lining, the reduction of time for the removal of waste linings and involvement in the production of industrial raw materials.

This objective is achieved in that the refractory ramming mass for lining furnaces, comprising a refractory filler, karunanidhi component, fire clay, graphite, phosphoric acid, according to the invention as the refractory filler is clay with the content of Al2O380-85% of natural bauxite in the following ratio, wt.

fireclay from natural bauxite with the content of Al2O380-90% of 55-65

karunanidhi component 16-20

refractory clay 7-9

graphite 7-12

phosphoric acid 4-5

The use of clay content 80-85% Al2O3from natural bauxite reduces thermal conductivity, which reduces heat loss unit, and baking results the mass thickness of the lining, and also speeds up the removal of the worn lining without compromising other properties ramming mass, at the same time eliminates the use of scarce corundum raw materials.

The invention errortype (ed.St. N 1076417) were manufactured refractory ramming mass. Preparation of refractory ramming mass was carried out in the system. In the mixer in the specified quantities loaded chamotte with the content of Al2O380-85% was moistened with an aqueous solution of orthophosphoric acid was stirred for 2-3 min, then was added graphite, karunanidhi component and refractory clay with continuous stirring. The total mixing time is 10 minutes

The conductivity was determined by the method of "cylinder" (MI 14-430-10-83) at 500-1200oC. Securityadmin defined (MI 14-430-006-82). The open porosity was determined (GOST 18847-73), ultimate compressive strength (GOST 4071-80), on samples fired at 1580oC.

The test results of the samples are presented in the table.

As can be seen from the table the proposed compositions of the printed mass have a lower conductivity of 2.45-2.55 W/moTo against 2,60-2,70 W/moFor the prototype, respectively, at temperatures of 500 and 1200oC.

In addition, the proposed formulations ramming masses have the same resistance to the action of cupola slag (square corrosive slag samples (170 mm2) as printed mass of the prototype (the area of the rust was going to rototype 23.3% of the ultimate compressive strength of the samples we 20,0-20,6 H/mm2the prototype -20,6 H/mm2. As for the outrageous compositions, the introduction of clay with soderzhanie Al2O380-85% of natural bauxite in a smaller number increases thermal conductivity.

A higher content of clay content 80-85% Al2O3from natural bauxite reduces the conductivity and increases securityadmin (181 mm2).

At the plant "stankolit were carried out industrial tests of printed mass of the proposed structure and the prototype in the cupola furnace linings specified mass of the ball is made lining 2 compression siphons. Both siphon served for 5 days. However, breaking the worn lining of the mass according to the invention was carried out for 5 hours breakdown of the lining of the mass of the prototype 20 PM

Industrial manufacture of refractory ramming mass according to the invention was carried out in Semiluki refractory plant in 1993 in the amount of 10 thousand tons per year.

Refractory ramming mass for the lining of furnaces, including fireclay, karunanidhi component, refractory clay, graphite and phosphoric acid, characterized in that it contains a clay content of Al2O380 to 85% derived from the% derived from natural bauxite 55 65

Karunanidhi component 16 20

Refractory clay 7 9

Graphite 7 12

Orthophosphoric acid 4 5o

 

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