The reasons of refractory brick collapse in the process of use

For refractory brick, we should not feel strange. With the progress of society, the application of refractory brick is more and more widely. Refractory brick appear collapse phenomenon, in the actual use so, what causes it; following the Xinmi Changxing refractory material factory is simple to give you introduced the refractory brick collapse reason

Refractory brick 1, red hot suddenly quenched with water to produce rupture and fall.

The 2 stage, oven heating rate master is not strict, temperature rise too fast, causing severe dehydration, masonry and damage due to expansion and shrinkage.

3 build stove masonry to expand stay insufficient, cracked and falling temperature after expansion.

4, the ash accumulation system, most of the metal salt corrosion of the refractory brick, embitterment of vanadium and nickel will penetrate into the refractory brick falling off caused by.

5 when the liquefied gas, heating, air flow ratio is undeserved, cause furnace blasting and vibration split off.

6, poor air flow furnace, flame directly flush furnace brick, the furnace brick thinning after a serious fall.

7, the operation too, lifting furnace temperature pressure to balance, it is strictly prohibited to excessive temperature and pressure, avoid the sharp rise in the drop, because the temperature of each layer of brick always lags behind the furnace temperature, the more rely on the outer temperature changes more slowly, if drastic changes in a short time the temperature of the furnace, brick layer between refractory brick and brick joints rupture is caused due to temperature difference is too large to generate huge internal stress. Furnace pressure will cause the sudden change, refractory brick for each layer of gas pressure can’t balance, pressure increasing and destroyed, may cause the whole refractory lining of furnace temperature fluctuation pressure serious collapse.

The role of boron carbide in castable refractory

Boron carbide refractory castable is very important to a substance; it can play a role in anti-compounds. Today, we look at the technical level to explain the important role of boron in castable.

Carbonation can make refractory castable product densification, suppression of carbonaceous refractory castable carbon compounds, but at the time of 1000 ℃ ~ 1250 ℃, Al2O3 and B2O3 reacts 9Al2O3 • columnar crystals 2B2O3, located in refractory castable the cracks in the matrix and thus decrease the porosity, temperature mobilize intensity, and the resulting 9Al2O3 • 2B2O3 crystals, volume expansion, can heal the volume is reduced, diminishing cracks.

Castable field of application of different specifications are not the same. We have to consider many factors, general used in firing big skateboard, Al2O3-SiC-C iron trough castable, as well as some high-speed non-burning carbonaceous refractory castable and Al2O3-C refractory castable, MgO-Crefractory interstitial castable general do not, due to the intervention of the elements boron affect the refractory castable using the furnace.

You can use Sic powder, metallic Al powder, metallic Si powder, ZrB6 from anti compounds such as replacing utility, aluminum casting material can be a little boric acid substitution, but pay special attention to the amount of manipulation.

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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.

Corundum products introduction

Corundum refractory materials refer to the Al2O3 content is more than products more than 90%, also known as alumina refractory products. Corundum has good stability, resistance to acid alkaline slag, glass and metal solution effect. It is in high temperature oxidizing atmosphere or use in a reducing atmosphere, can receive the good effect.

The physicochemical index of high purity corundum brick:

Al2O3 content≥99%, volume density≥3.2, apparent porosity≤18%, pressure temperature at normal temperature MPa ≥90,

Load softening temperature (0.2MPa, 0.6%) 1740℃.

Product characteristics and application:

Products with high refractoriness, good thermal stability, high temperature strength, corrosion resistance, excellent high slag resistance, small coefficient of expansion, the creep characteristics of low, spalling resistance, high temperature furnace is suitable for various conditions of use.

Widely used in zirconia ceramics fiber, fluorescent materials, electronic ceramics, magnetic materials, ceramic powder with high temperature sintering and gasifier, synthetic ammonia two reformer, carbon black reactor and glass industrial high temperature furnace and other equipment. Size, products, service life of physicochemical indexes have reached or exceeded the level of similar products at home and abroad.