Sodium tripolyphosphate production process from the phosphoric acid in soda ash and positively by the sodium, and then formed by condensation. Production of phosphoric acid methods are wet and hot and French. Wet is the phosphorus and inorganic acids (usually sulfuric acid, hydrochloric acid has recently been used) reaction, after extraction, refining phosphoric acid after too. Thermal method is the furnace will be phosphate and silica, together with the coke calcination, phosphate material reduced to phosphorus, and then oxidation, hydration, that is too acid.
The system by making a phosphate of sodium tripolyphosphate process is relatively simple and short process, control, easy to operate. There are two main ways.
① Spray Drying - BOF condensation bis law: spray dryer as a cylinder, the upper horizontal and with a gas burner nozzle connecting. Temperature is 400 ~ 500 ℃ gas burner pass through the spray drying tower into the upper part, while high pressure (4.2MPa) pump is injected into phosphate solution. Moisture content below 5% of the dry products constantly removed from the dryer bottom. Orthophosphate mixture into a rotary furnace in the dehydration condensation of sodium tripolyphosphate. This method is characterized by product without the need for grinding, spray dryer drying, high efficiency, dry material is very uniform, stratification does not occur; disadvantage is that two hours of drying and condensation carried out
Direct heating dehydration big losses when the dust.
② Dry - Dehydrated a law: The slurry sprayed into the rotary furnace, the furnace nozzle into hot air or burning oil to heat. Ring baffle into the furnace flame section and heating section. In the heating section, the materials into the final dehydration condensation and sodium tripolyphosphate. The cooling tube and the rotary kiln fused out from the cooling tube granular products in the grinding machine grinded out from the furnace a small amount of powder recovered in the cyclone. This law will be dry, dehydrated and cooling equipment, combined in a single unit within, so that greatly simplify the process, heat utilization is higher and can reduce infrastructure investment, improve labor conditions.
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