Raw Material Preparation
The primary raw materials for producing Polyaluminum Chloride (PAC) include calcium aluminate mineral powder, aluminum oxide, and aluminum hydroxide. Among these, calcium aluminate mineral powder serves as the principal aluminum-bearing raw material; its quality directly impacts the production efficiency and outcome of the PAC. Therefore, prior to production, the calcium aluminate mineral powder must undergo rigorous inspection to ensure that critical parameters-such as aluminum oxide content, impurity levels, and particle size distribution-meet production specifications. Additionally, appropriate quantities of auxiliary materials, such as hydrochloric acid and water, must be prepared.
Reaction Process
The reaction process constitutes the pivotal stage in the production of PAC. First, the calcium aluminate mineral powder is mixed with a suitable amount of hydrochloric acid solution and subjected to a reaction under conditions of high temperature and high pressure. During this process, parameters such as temperature, pressure, and concentration must be strictly controlled to ensure the reaction proceeds to completion. As the reaction progresses, aluminum oxide and chlorides are gradually generated, forming an aqueous solution. Continuous agitation is also required throughout the reaction to prevent localized concentration imbalances-whether too high or too low-which could compromise product quality.
Maturation Process
Maturation is one of the critical stages in PAC production. During the maturation process, the generated aluminum hydroxide undergoes a curing treatment to facilitate the loss of water molecules and its transformation into PAC. Parameters such as temperature and duration must be carefully controlled during maturation to ensure the stability of the PAC's quality. Concurrently, continuous agitation is necessary during this stage to prevent the product from clumping or precipitating.
Drying Process
Drying marks the final stage in the production of PAC. During the drying process, the matured PAC is subjected to a drying treatment to remove residual moisture, yielding the final dry PAC product. Parameters such as temperature and duration must be controlled during drying to ensure the stability of the finished product's quality. Typically, drying is accomplished using processes such as spray drying or drum drying. Throughout the drying process, care must be taken to prevent the product from becoming excessively dry or scorched, either of which would negatively impact product quality.
Packaging and Storage
Following the drying process, the PAC requires proper packaging and storage. The product should be packaged in bags with excellent sealing properties to prevent moisture absorption or deterioration. Furthermore, strict control over the humidity and temperature of the storage environment is essential to ensure the continued stability of the product's quality. During storage, periodic inspections of both the product's quality and the condition of its packaging should be conducted to promptly identify and address any potential issues.
