castable operation procedures for refeating furnace

First, castable operation procedures
The physical and chemical properties of various refractory castables used in the heating furnace must meet the design requirements and national standards. The construction must be operated strictly in accordance with the product instructions and design requirements and national regulations. Due to the wide application of low-cement and non-cementable castables in heating furnaces, the amount of added water (or aqueous solution) must be strictly controlled when the castables are stirred, and the amount of water (or aqueous solution) added is inaccurate, which directly affects the quality and use of castables. life. Increasing the amount of water (or aqueous solution) (sometimes only 1% more) will cause a large amount of bubbles or no hardening of the castable; the addition of less water (or aqueous solution) may fail to form and affect the construction. Therefore, the amount of water and the amount of water added to each tank must be measured accurately. The added water must be clean water (no sewage, especially seawater). The castables with admixtures should be dissolved in water before being dissolved in water and then added to the mixer. The stirring sequence is: first dry mix the aggregate, powder and binder for 2 ~ 3min to evenness, then add water (or even aqueous solution) and stir for about 3min before pouring. The well-mixed material should be used within 30 minutes, and the remaining material must not be recycled. When pouring, the material should be evenly spread and the height of the material layer must not exceed 1.2 times the effective length of the vibrating rod. Plum-shaped insert rod, even vibration, do not leak vibration and vibration, return to the pulp can be. Vibrating rods should be inserted quickly and slowly so as to avoid "karst holes" and numbness.
Second, furnace bottom and masonry construction
(1) Before the masonry is done, clean the foundation surface first, then cast the bricklaying line and the brick elevation line, then masonry. When stepping bottom or ring bottom is masonry, the debris in the water seal groove must be cleaned, and mud and brick slag must not be dropped. At the same time to ensure the gap between the tiles on both sides of the water seal tank. The bottom of the walking beam shall be masonry, and the reserved size of the girder pouring material shall be ensured and shall not be too small.
(2) The fixed girder embankment uses the surrounding furnace bottom masonry as the outer mold, the upright column is the inner mold, and the movable column must be installed with the removable special-shaped inner mold.
Before the pillar embankment is poured, the inner cavity of the template shall be cleaned and the expansion joint plate shall be provided according to the design requirements. Lightweight castables are used first, followed by clay combined with castables, then high-strength castables, poured upwards one by one.