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Calcium Aluminate Powder: An Introduction to Calcium Aluminate Powder

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Industry News

2021-11-19

Calcium aluminate powder (a raw material for water purification agents) has CaO, Al₂O₃, and Fe₂O₃ as its main components and exhibits strong reactivity. Producing water purification agents via a one-step acid dissolution method can significantly save labor and electricity, substantially reduce costs, and offers advantages such as simple process equipment and ease of operation. It is an ideal raw material for the production of basic aluminum chloride and polyaluminum chloride products.

Calcium aluminate powder (a raw material for water purification agents) primarily consists of CaO, Al2O3, and Fe2O3. It exhibits strong reactivity. Using an acid-soluble one-step process to produce water purification agents can significantly save labor and electricity, substantially reduce costs, and offers advantages such as simple process equipment and ease of operation. It is an ideal raw material for the production of basic aluminum chloride and polyaluminum chloride products.

Calcium aluminate powder is a grayish-white powder. Its main components are a mixture of calcium dialuminate (CaO·2Al₂O₃) and calcium monaluminate (CaO·Al₂O₃). It is slightly soluble in water, and its aqueous solution is alkaline, with a pH value of approximately 11. Calcium aluminate powder exhibits high reactivity when reacted with strong inorganic acids, initiating the reaction even at room temperature. Moreover, it releases substantial heat and heats up rapidly; the dissolution rate of aluminum oxide can exceed 90%. Using this material as a raw material to produce liquid or solid polyaluminum chloride can simplify the production process, reduce costs, and improve product quality. It is the raw material most widely adopted by polyaluminum chloride manufacturers both domestically and internationally.

During production, first add water to the reaction tank and turn on the agitator. Then, add hydrochloric acid in a measured amount, dilute it to the required concentration, and subsequently slowly add calcium aluminate powder to initiate the reaction.

During the reaction process, the temperature inside the tank will gradually rise. When the temperature exceeds 110°C, water can be added in small amounts as needed to moderate the reaction and prevent it from becoming too vigorous and causing overflow. Water should be added in small increments multiple times to maintain the required normal temperature. After adding the calcium aluminate powder and allowing the reaction to proceed for another 2 hours, use a pH test strip to verify that the pH is greater than 3. Then, add water to dilute the mixture until the density reaches 1.25–1.26. After discharging the mixture into the sedimentation tank and allowing sufficient time for sedimentation, the clear supernatant liquid obtained is the liquid product. Alternatively, the liquid product can be dried using a dryer to produce solid polyaluminum chloride.

Calcium aluminate powder is primarily used in the production of aluminum salts such as polyaluminum chloride, aluminum sulfate, and sodium aluminate. It can also be used to adjust the alkalinity level and as a raw material for refractory materials.

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