Hot air blowing

Stannic Oxide. Stannic oxide tin(IV) oxide, white crystals, mol wt 150.69, mp > 1600° C, sp gr 6.9, is insoluble in water, methanol, or acids but slowly dissolves in hot, concentrated alkaH solutions. In nature, it occurs as the mineral cassiterite. It is prepared industrially by blowing hot air over molten tin, by atomizing tin with high pressure steam and burning the finely divided metal, or by calcination of the hydrated oxide. Other methods of preparation include treating stannic chloride at high temperature with steam, treatment of granular tin at room temperature with nitric acid, or neutralization of stannic chloride with a base. 

Blowing hot air A typical arrangement is shown in Figure 31.9. The bus duct enclosure is provided with inlet and outlet valves at suitable locations. Hot air is supplied through the inlet valve until the interior of the enclosure is completely dry. The blowing equipment comprises an axial flow fan. a heater unit, an inlet air filter unit, pressure... 

In the process, the catalyst is continuously separated from the mixture at the top of the reactor and sent to a regenerator where carbon and other contaminants are removed by blowing hot air irito the regenerator forming CO/CO9. From the top of the reactor, the product mbc moves to the separation columns where ethylene and propylene are separated from the heavier C4 products, any unreacted methanol, and the water that gets formed. 

Roasting in air and smelting and blowing hot air - copper is extracted by this method. 

Y-Ray powder samples were prepared in 0-3 mm. quartz capillaries in the manner usual for volatile material and powder photographs were taken at various temperatures. Higher temperatures were achieved by blowing hot air over the capillary mounted on a standard 14-32 cm. diam. General Electric Precision camera. The temperature was controllable to 1°, and was recorded throughout the ex-... 

About 90% of the wool wax can be removed by this system. The recommended solvents are benzene, carbontetrachloride, solvent naptha, white spirit, trichloroethane etc. In one method solvent is applied under high pressure jet on the material placed on a permeable conveyer and dislodges much of the dirt and suint apart from removal of wax from the fibre [36]. The solvent content on the treated wool is reduced to about 45% by passing through the rollers and is further reduced to about 10% by centrifuging. Finally, the residual solvent is removed from the fibre by blowing hot air [37]. 

Space heating and hot water supply A similar system to the one discussed above may be used to blow hot air into the foundry hall for space heating. Alternatively, a water-water heat-exchange is used to heat a water circuit for radiators or for hot water supply. 

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