High strength low cement castable

[purpose] heating furnace; furnace flame environment such as rolling heating soaking pit wall, top, bottom, pipe, burner cast or prefabricated, industrial boiler body; chemical equipment such as ammonia, a two conversion furnace lining casting;

[Characteristics]

high refractoriness — low cement castable content more than 1650-1800 DEG C, refractoriness, high temperature performance;

Intensity high — temperature, high temperature strength, anti erosion, anti stripping;

Anti erosion — at high temperature for various kinds of steel slag has strong resistance to erosion ability;

[Usage]

According to the proportion of water, stir into a mortar machine, vibration molding.

[Storage]

25kg/ bag sealed package at room temperature for 3 months.

The formation of the smelting furnace slag layer

Infiltration of molten state in refractories copper matte with good mobility. Due to the surface in the reaction tower refractory lining is covered with a layer of dense with magnetic iron oxide for hanging slag layer is mainly composed of, so he struck the wall surface matte does not directly penetrate into the brick body, but first of all along the silicate slag channel infiltration within the material and the interaction and slag, slag at different depth generate Cu or Cu2O material.

Reaction tower wall surface slag although direct intrusion effectively prevents the copper matte, but did not completely eliminate the erosion caused by the matte of lining. Through the slag layer, there are still a small number of matte can penetrate through, and then along the brick body pores or cracks penetrate within the capillary channel brick. Because of the more close to the firebrick center, oxygen potential is higher, so into the brick body after the copper matte is prone to oxidation reaction. After reaction, the generated Cu2O exists between the lining the main crystal and the matrix, and no penetration into the other grains.

Molten copper oxide (CuO-Cu2O at 1140 DEG C when the low total soluble) will cause the increase of permeability refractory brick thermal conductivity, the resulting expansion of strong diathermy, lining spalling and, in which Cu is oxidized to CuO, the volume expansion of 75%; oxidized into Cu2O, volume increased by 64%. Therefore, from the microscopic structure, corrosion of matte on the reaction tower lining is mainly for the chemical structure of permeability, copper matte and the resulting stress reaction.

The main problems of new dry process kiln refractory materials

(1) Refractory material inner quality is not stable and the size of irregularity is a serious problem in the whole industry. The main reason is that the level of equipment for producing refractory material is too low, the management problems of the production is also more. Neither series manufacturing refractory equipment factory supply meet the transformation requirements of fixed-point production equipment, refractories enterprises benefit and decreased year by year, outdated equipment, the lack of its own functional improvements, unable to carry out technical transformation.

(2) The cement factory on refractory material selection and storage also has many problems, some kiln equipment and process many problems, even frequent stop kiln. Therefore, only a handful of kiln, the world’s advanced level of refractory material unit consumption reached 0.6-0.8kg / T, generally deviate a lot.

(3) The new dry process kiln refractory materials production capacity at present more than 10000 tons, but cannot satisfy the kiln; needs development, must have the correspondingexpansion.

(4) in recent years abroad new dry process kiln lining tends to be light, is light and ultra light materials to improve the quality, the use of an increase in the proportion of the kiln lining, the total weight of about minus 20%, further open the gap between us and them.

(5) In foreign countries are promoting the use of low chromium (Cr2O3 < 4%)magnesia chrome brick, and on the development of chrome free basic bricks of high quality. China is lack of chrome ore resources of the country, to high quality alkaline brick rapid development and production of low chromium or chromium free, can also help to reduce the chromium pollution on the environment.