04.
Control the water cement ratio when mixing the castables.
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02.
The castable shall be used up within 30 minutes after mixing.
In order to prolong the service life of the boiler, castables are generally used to repair the parts of the boiler that are severely worn.
However, castables cracks may occur after the construction is completed.
Why does this problem occur? If you want to solve this problem, you must first know the cause of the crack.
When is the most appropriate time for demoulding? The castable can be removed only when its strength can ensure that its edges and corners will not be damaged due to demoulding.
Natural gas forging heating furnace, annealing furnace, aluminum melting furnace welcome your customization! Tel: 1561013878801, Preface Overview The lining of the boiler will be worn after it has been running for a period of time.
If too little water is added, the fluidity of the castable will be poor, the vibration will not be dense, and it is easy to leave pores, bubbles, etc., and the strength will be greatly reduced.
The principle of oven drying is “long rather than short, slow rather than fast”.
It is said that the castable can be demoulded before it is completely hardened.
To facilitate demoulding, a layer of oil shall be coated on the pouring surface of all moulds before pouring.
Excessive water is added to the castables during mixing, which will easily lead to high internal porosity, low strength, long natural setting time and increased curing time after the castables are formed.
In serious cases, it will even directly damage the boiler and affect the normal operation.
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Control of mixing time and construction time When mixing castables, the mixing time must be strictly controlled.
05.
If the time is too short, the castables will be mixed unevenly, not dense, and the strength will be reduced; If the mixing time is too long, the castable is easy to delaminate, the fine powder floats on the surface, and the aggregate settles on the bottom, resulting in the reduction of castable strength and easy peeling.
It shall be carried out according to the oven curve prepared in advance, the heating speed shall be uniform and stable, the constant temperature time and temperature shall be well controlled, and the temperature fluctuation shall not be greater than ± 20 ℃.
Curing time control of castables After construction, castables should have enough natural drying period to separate most of the moisture in the refractory layer, so as to prevent a large amount of moisture from not being discharged in time when drying the furnace, causing the refractory layer to burst and fall off.
03.
Company Introduction Jinan Weiguang Energy Saving Technology Co., Ltd.
Prevent the temperature rising too fast, the water can not be discharged in time, and the wear-resistant and fire-resistant layer will be broken; Secondly, it can prevent the temperature fluctuation in the refractory and wear-resistant layer from being too large, resulting in huge thermal stress, causing the wear-resistant and wear-resistant layer to crack, bulge and fall off.
The demoulding time is not well controlled.
