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How Calcium Aluminate Develops Polyaluminum Chloride
Calcium aluminate is an off-white powder. The main ingredient is a mixture of calcium dialuminate (CaO·2A1203) and calcium aluminate (CaO·A1203). Slightly soluble in water, aqueous solution is alkaline, PH value is about 11.
Calcium aluminate reacts with inorganic acids with high reactivity and can start at room temperature. With large heat release and rapid heating, the dissolution rate of alumina can reach over 90%. Using it as raw material to produce liquid or solid PAC can simplify the process, reduce costs, and improve product quality. At present, most of the domestic and foreign polymeric chlorines Raw materials used by aluminum producers.
Calcium aluminate reacts with hydrochloric acid to produce a polyaluminum chloride in one step. The composition ratio is calculated as follows:
Where: WHCl-weight of hydrochloric acid to be added
W-preferred calcium aluminate weight Kg
B- Expected degree of alkalization of polyaluminum chloride product
Aal2O3-calcium aluminate in alumina%
AcaO-calcium aluminate oxide content%
Ahc1-hydrochloric acid content in hydrochloric acid%
N-dissolution rate %
When producing, first add water to the reaction tank and turn on the stirring paddle. Then quantitatively add hydrochloric acid, dilute to the required concentration, and then slowly add calcium aluminate to react. During the reaction, the temperature in the tank will gradually increase. More than 110 °C. Appropriate amount of water can be suppressed. The reaction will not be fierce and overflow the pool. Make up a small amount of water several times. Maintain the normal temperature required. After adding calcium aluminate, and then reacting for 2 hours, when the pH test paper is used to measure more than 3, it can be diluted with water to a density of 1.25 to 1,26. After the material is discharged into the sedimentation tank, the supernatant liquid is a liquid product. , It can also be dried by a dryer to obtain a solid polyaluminum chloride product.