Binders_additives

Binders and additives   1 water glass Compared to the composition of the glass of water is sodium silicate (Na2O - which), also known as sodium silicate and its solution is green gray, transparent viscous liquid is a mineral rubber and organic glue, combustion is not corrupt. The molar ratio of SiO2 to Na20 in a water glass solution is called the modulus of water glass (M), the modulus of which is usually 2.0~3.5. The viscosity of the water glass increases with the increase of the modulus and density, but the temperature is increased, but the viscosity is decreased. When the temperature is below zero, the viscosity of the water glass increases sharply. After heating, the performance of the frozen water glass can not be changed, and still can be used as usual. When the density of the water glass solution is larger, it is necessary to add water to dilute it: Water glass dilution formula Type V - dilution water; A - dilute the density of the water glass solution; Density of PN dilute U  aqueous solution;Vu - need to dilute the amount of water glass solution. In order to accelerate the hardening, it can be mixed with the coagulant of the coagulant of sodium silicate, and the amount of the added amount is 12%~15% of the water glass quality. Water glass is often used to modulate mud, paint and refractory concrete.   2 sodium fluoride Sodium fluoride (Na2SiF6) as a white powder, in water solubility is very small, acidic reaction, toxic. When wetting and agglomeration, it is necessary to be dried, crushed and used. Drying temperature should not exceed 65 degrees Celsius, so as to avoid the volatilization of sodium fluoride precipitation SiF4. "Industrial sodium fluoride" (ZBG12017-89) according to the different levels of content is three, the quality of its products should not be less than 97%. Sodium silicate is used as a coagulant to accelerate the hardening of water glass. 3 phosphoric acid There are two kinds of phosphoric acid, phosphoric acid (H3PO4), phosphoric acid (H4P2O7) and phosphoric acid (HPO3). Among all kinds of phosphoric acid, phosphoric acid is the most stable one.    It is mainly used in the industrial furnace masonry. Phosphoric acid is a colorless and transparent body, which is easily dissolved in water. In general, the mass fraction of phosphoric acid H3PO4 in industry is about 85%, which is in a thick paste. Phosphoric acid is used to prepare all kinds of phosphate - resistant concrete and phosphate slurry. Phosphoric acid, a phosphate, is generally used in phosphate and its mass fraction is 40%~50%. Phosphoric acid is corrosive to metal, human skin and clothing, and must be prepared with a ceramic jar or other acid proof container. Phosphoric acid dilution, the appropriate to water into the cylinder, and then slowly injected with phosphate, injection with stirring, so easy to mix. Concentrated phosphoric acid or phosphoric acid solution prepared, stored for a long time or temperature below 5 degrees Celsius, there is a crystal precipitation or precipitation phenomenon. This situation is not bad, because the container is not smooth, the impact of the vibration generated by the crystal, resulting in crystallization of phosphoric acid. Crystallization processing method is phosphoric acid heated to 80 degrees Celsius above, eliminate seed, otherwise cold again after crystallization, precipitation to stir and then. 4 brine The main ingredient of brine is magnesium chloride (MgCl2), which is usually solid. Before use, the brine is placed in the container, and the water is added to the water, and the water is heated to make it reach the required density. Brine is a toxic species, pay attention to the custody of. Brine in industrial furnaces is mainly used to modulate magnesia mud and ramming. Modulation brine mud easy solidification. Therefore, the masonry of the mud should be with the with the use, storage time should not be too long, the construction should be immediately baking. 5 boric acid Boric acid (H3BO3) is a white fine powder. When heated to 171 degrees Celsius, the dehydration into B2O3; to 588 degrees in the molten state, with the formation of quartz glass phase (boron silicate), reducing the melting point of the quartz. Accelerated quartz into scale quartz and quartz. The quality fraction of H3BO3 in industrial boric acid, >96%, should not be affected with damp. Boric acid is mainly used for knotting acid furnace lining adhesive. 6 pulp waste liquid Pulp waste liquid is paper mill with alkali or acid and raw materials (such as wood, etc.) common cooking containing lignin dark brown liquid. Alkaline pulp waste liquid adaptability is poor, rarely used, often using sulfite pulp waste. Lignin polymer viscosity colloidal solution is the main component of lignosulfonates with different degree of sulfonation. The pulp waste liquid has good hydrophilicity, can reduce the surface tension of water, and enhance the capillary effect of the liquid. The viscosity of high concentration pulp waste liquid was properties of diluted with low concentration diffusion, emulsification, foaming. Sulfite pulp waste liquid has a plasticizing and water reducing and the adhesive function, mainly used as refractory binder, plasticizer and additives. 7 coal tar Coal tar oil is commonly known as smelly, fractionated coal carbonization process is very complex products. At room temperature for black, brown viscous liquid, the density of 1130kg/m3~1220kg/m3. Toxicity, high viscosity, and a pungent odor, especially when heated. Coal tar in the use of the need for dehydration treatment, so that the water is less than 0.5%. Coal tar is mainly used as a binder and making arc furnace lining knotted tar magnesia brick. 8 coal tar pitch Lek celadon is a good bonding properties of organic binder, there are two kinds of coal tar and petroleum asphalt, asphalt is rarely used as a binder for refractory materials. Bituminous coal is coal tar residues after fractionation, at room temperature is black or dark brown solids. When the initial combustion of tobacco and a special smell. A sense of strong heat, crisp winter. In 200 degrees above carbonization, volatile fixed carbon volatiles removed left from the skeleton effect in the furnace lining. The quality of coal tar pitch is higher than the content of free carbon and less volatile.