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:
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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, etting 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 sric acid
There are two kinds of sric acid, sric acid (H3PO4), sric acid (H4P2O7) and sric acid (HPO3). Among all kinds of sric acid, sric acid is the most stable one.
It is mainly used in the industrial furnace masonry.
sric acid is a colorless and transparent body, which is easily dissolved in water. In general, the mass fraction of sric acid H3PO4 in industry is about 85%, which is in a thick paste. sric acid is used to prepare all kinds of ste - resistant concrete and ste slurry.
sric acid, a ste, is generally used in ste and its mass fraction is 40%~50%.
sric acid is corrosive to metal, human skin and clothing, and must be prepared with a ceramic jar or other acid proof container. sric acid dilution, the appropriate to water into the cylinder, and then slowly injected with ste, injection with stirring, so easy to mix.
Concentrated sric acid or sric acid solution prepared, stored for a long time or temperature below 5 degrees Celsius, there is a crystal precipitation or precipitation nomenon. This situation is not bad, because the container is not smooth, the impact of the vibration generated by the crystal, resulting in crystallization of sric acid. Crystallization processing method is sric 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 , 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 se (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. Alka 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 hydrolicity, 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. h 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 aslt, aslt 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 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.
