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High alumina phosphate mud
Refractory mud can be divided into: dry soil refractory mud, high alumina refractory mud, siliceous refractory mud, magnesia refractory mud, etc. according to the composition of materials. According to the different binders, refractory mud can be divided into the following three categories:
(1) Ceramic bonded refractory clay It is a mixture of refractory fine aggregate and ceramic binder (plastic clay). The delivery state is dry, it needs to be added after water, and it is hardened by ceramic bonding at high temperature.
(2) Hydraulically bonded refractory mud It is a mixture of refractory fine aggregate and a hydraulic binder (cement) which acts as a primary bond. The delivery state is only dry, it is used after adding water, and it does not need to be heated during hardening.
(3) Chemically bonded refractory clay is a mixture of refractory fine aggregate and chemical binder (inorganic, organic-inorganic, organic). The delivery state can be either slurry or dry, hardening at a temperature below the ceramic bonding temperature. According to the hardening temperature, the refractory clay can be classified into two types: gas hard and hot hard. The gas-hard refractory mud is usually prepared by a gas-hardening binder such as water glass. The thermosetting refractory mud is usually prepared by a thermosetting binder such as phosphoric acid or phosphate. After hardening the thermosetting refractory mud, in addition to having high strength at various temperatures, it has the characteristics of small shrinkage, tight seams, and strong corrosion resistance.
Phosphate refractory mud:
The refractory mud is used for laying various heating furnace bodies. It is a refractory brick bonding material, which has sufficient bonding strength and physical and chemical properties and other various properties similar to those of refractory bricks. In the past, clay mud (30% raw clay powder, 70% cooked clay powder) was widely used. The clay mud has low bond strength and poor corrosion resistance. The use of the heating furnace not only has a low service life, but also causes a decrease in the heat preservation capacity of the furnace body and an increase in energy consumption. Therefore, improving the bond strength and other properties of the refractory mud is a key issue in extending the life of the furnace and saving energy.
High-strength phosphate refractory mud is prepared by using five kinds of raw materials such as phosphoric acid, aluminum scrap, high-aluminum powder, aggregate and additives. Phosphoric acid reacts with aluminum chips to form Al(H2PO4)3. Al(H2PO4)3 is the binder of the mud. High aluminum powder increases the chemical activity of the mud. High aluminum aggregate improves the thermal stability of the slurry. (H2PO4)3 adhesion to refractory bricks.
Operation process: a certain proportion (weight) of phosphoric acid is put into a non-metallic container, heated to 60 ° C, and then added aluminum chips and additives in proportion, after the reaction is stopped, the unreacted aluminum chips are removed, and then the high aluminum bone is removed. The high-aluminum powder was placed into the container in batches, stirred evenly and allowed to stand for 1 h. The adjusted mud should be dry and wet properly. The too dry mud reduces the free Al(H2PO4)3, the bond strength is reduced, the too thin mud, the excess water is too much, the porosity of the mud is too large, and the strength of the mud itself is reduced. . It can be flowed, can be drawn into silk, and can be used after use (it is suitable for bonding after bonding. The bonded refractory brick can be dried immediately or dried for a while.
The high-strength phosphate refractory mud can be applied to the heating furnace of clay brick, light clay brick, high-aluminum brick, silica brick, mullite brick, corundum brick, etc., especially for heat treatment salt-dissolving furnace.
Masonry of clay bricks, high alumina bricks, mullite bricks, sillimanite bricks and corundum bricks widely used in blast furnaces, hot blast stoves and other industrial furnaces
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