Refractory castable material inspection before construction

Construction of casting material before should strictly check the following:

    1. Casting material construction is made of steel or hard wood templates are available. The template must be of adequate strength, good rigidity, not out of shape, do not shift, no leakage of slurry. Steel template to mold release agent. Wood template to brush waterproof paint. The repeated use of the template to cleaning, painting can be used.
    2. Water, pouring material should be strictly according to the manual control, shall not exceed the limit. Under the premise of ensuring the construction performance, the amount of water should be less than.
    3. Castable refractory mixing time should not less than 5 minutes. The operation to the use of forced mixer. Mixing should first dry mix, then add 80% dosage of water mixing, and then depending on the extent of wet and dry, gently stir until the remaining water, obtaining suitable work consistency so far. Stirring casting material different should first mixer clean.
    4. Pouring material must use the whole barrel bag full of. Stirring casting material generally good must be used within 30 minutes. Drying at high temperature working environment should be appropriate to shorten this time. Already first castable coagulation even caking not poured into the mould, nor of mixing water reuse.
    5. If the project inspection unqualified should deal with qualified rear can construction. Expired materials shall not be used. Construction of castable to ensure that no power outages not interrupted construction.

Light-weight Insulating Castables for Heating Furnace,Insulating Castable

Light-weight Insulating Castables for Heating Furnace

This product mainly takes multi-hole clinker, floating ball, vermiculite and perlite as principal raw materials, and it is characterized by high strength, good heat insulation property and thermal shock resistance. It can be used as the heat-insulation castable on parts like furnace wall, top and bottom of various steel rolling heating furnaces.

Light-weight Insulating Castables for Heating Furnace

Light-weight Insulating Castables for Heating Furnace

 

Introduction

Our company manufactures and supplies superior quality range of Insulating Castable that is a light weight refractory concrete. We provide pre-cast and fired castable at industry leading prices and these are widely used as castable for walls, roof and bottom of steel rolling heating furnace.

Light-weight Insulating Castables for Heating Furnace

 Light-weight Insulating Castables for Heating Furnace

This product mainly takes multi-hole clinker, floating ball, vermiculite and perlite as principal raw materials, and it is characterized by high strength, good heat insulation property and thermal shock resistance. It can be used as the heat-insulation castable on parts like furnace wall, top and bottom of various steel rolling heating furnaces.

Notes About Fire Bricks Laying During Furnace Construction

1. Construct the furnace either by one kind of brick or by two kinds of brick, the required matching percentage of brick in theory may differ from the actual percentage affected by distortion of cylinder. So there is no need to use bricks totally as the theoretical required amount while constructing the furnace. It’s a key point to lay the big side of brick close to the cylinder when doing the construction, and the bricks should be laid straightly and there had better no gaps between each two bricks. Fill the gaps and distortion with mortar, the repair seam line should not be too hard in case of breaking of bricks.

2. Abandon the twisted bricks which are out of distortion standard, making sure that the bricks are tightly bonded and no looseness. While construct the furnace by bricklaying machine, the upper brick especially alkaline brick can not be given too much pressure, because alkaline brick’s strength at normal temperature is relatively lower. Avoid bricks broken by uneven compression, so that to avoid kiln body falling off while working.

3. While laying alkaline bricks, watering or grouting the brick upper surface is prohibited. The well up cement mortar should be cleaned before it hardens.

4. Construct the furnace strictly according to each brick matching method to avoid distortion of brick block and kiln body working out of balance, furthermore to avoid affecting working cycle.

5. During the construction, check carefully and immediately both annular flatness and axial flatness according to the datum line in every circle and section. Parallel vertical seam line with furnace axis, parallel annular seam lines with each other, and make the parallel annular seam line vertical with the furnace axis. If the furnace body distorts or the bricks are irregular, adjust the body by steel plate and the bricks by cement mortar. The steel plates should just fit with the bricks (the length and height of steel plate should be 5mm smaller than those of brick).

6. When finish semicircle construction of the furnace, firstly check the deviation of vertical seam line with datum line and annular seam line with datum line, then lay one tier or two tiers of bricks, set up the mandrel and turn the furnace by 90⁰. Construct the left half furnace on the other side, set up another mandrel while finishing one section. Turn the furnace after the mortar hardens.

Refractory Castables for Working Lining of Heating

Refractory Castables for Working Lining of Heating 

The castables, characterized by qualified flint clay, superfine aluminuma, fused alumina, sintered mullite, etc material and combined with micro mist, several additives. Its main character is good volume stability, good thermal shock resistance and high strength, widely used for heating furnace’s roof and wall of various types of steel rolling by casting.

Construction of Refractory Castable

During the construction of refractory castable, special attention should be paid on pin welding, asphalt brushing, stirring of castable with water, making and fixing of mould, vibration and ramming of castable, demoulding, sizes’ and measuring points’ accuracy, etc. http://www.yilongrefractory.comDo construction strictly as material manufacturer and boiler works required.

1. Installation of Pin and Claw Nails

Reinstall the pins missing for any reason and the pins in the area of heating surface composite melding junction before hydraulic pressure. Lengthen and reinstall the pins properly in coal mouth, material return mouth and upper inflection point of air duct furnace so that meets the required density of pins. Brush all the pre-buried metal parts and claw nails with asphalt paint (thickness > 1mm) or cover them with combustibles before casting.

2. Dosing and Stirring of Castable & Water

The dosing of castable and water should be done strictly as the instructions of material manufacturer. The water should be clean, such as drinking water, ph 6-8. The mixer should be clean forced action mixer, and clean it for the next time using. Pay attention on the adding order of castable and water and its stirring time, adding water freely and prolonging of stirring time are forbidden. The water and castable should be mixed evenly and stirred till smooth. Carry away the mixed casatble immediately after stirring, the castable poured out from stirring tank is disallowed to be poured into the tank and stirred again. Clean the tank after every construction for the next using, record the amount of water and castable, and the stirring time.

3. Checking Before Making Template

Check carefully whether the pin, hook nail and strutting part conform to the drawing, whether all the re-welding and is done and firm, whether the temporary metal parts have been cut off. Check whether the metal parts which should be brushed with asphalt paint meet the requirement, whether the casting place is clean, any other unrelated materials are forbidden to appear. For easy demoulding, a thin tier of partition (such as used oil) can be brushed in the mould. There can not be gaps between each two templates to avoid castable leaking out, so that also convenient for mould releasing. The refractory castable should be used up in 30 minutes after stirring, and should be casted to the required thickness in 1 time. Ram the castable till tight. For the too thick parts, cast tier by tier, while casting the upper tier, vibration bar can not touch the lower casted tier.

Types, Technical Properties and Application of Refractory Castable

Types of refractory castable
    Refractory castable mainly distinguished according to apparent porosity, anchoring agent, and types of aggregate. Besides that, refractory castable also classified according to applied temperate and functional characteristics when used. According to apparent porosity, it can be divided into compact refractory castable and adiabatic refractory castable whose apparent porosity is not less than 45%; according to anchoring agent, it can be divided to hydraulicity refractory castable, chemical constitution refractor castable and union refractor castable. The hydralicity refractory castable can harden in normal atmospheric temperature or by hydration, which mainly include portland cement, ordinary Calcium aluminate cement, pure Calcium aluminate cement and elect rometrical pure Calcium aluminate cement. The chemical constitution usually harden by adding curing agent to lead to chemical reaction in the normal atmospheric temperature, which mainly includes sodium silicate refractory castable, aluminum sulfate refractory castable and phosphate refractory castable. The union refractor castable turns to hard by sintering in the process of calcination, which mainly include Clay castable. According to refractory aggregate, there are clay aggregate (Al2O3 30%～45%),high aluminum aggregate (Al2O3%26ge;45%), silicon aggregate (SiO2%26ge;85%、Al2O3%26lt;10%), alkalin-ous aggregate (magnesite clinker and dolomite ) , special aggregate (carbon, carbide, spinel, zircon and nitride ) and adiabatic aggregate (pearlstone, vermiculite, ceramicite, floater, light brick sand, Porous clinker, and alumina hollow sphere). In the process of construction, it is available to use some mixture aggregate according to construction necessaries. Technical performances and applications of refractory castable
    Refractory castable as the main sort of unshaped refractory material, which can be used without fritting, besides that, among all he unshaped materials it with simple produce craft ship, needs no equipments, with high level of mechanization, easy to construct and with high coefficient of utilization. What’s more, refractory castable often have high intensity and can be made into fabricated material that used by furnace, for example, continuous casting weir plate preform which is pans available refractory castable.
     Refractory castable mainly used in casting industrial stoves, and also widely applied in fossil oil, chemical industry, electric power, mechanical industrial stoves, and thermal equipment.