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Excessive free water. The drying temperature is too high.
If there is agglomeration of zinc sulfate heptahydrate, there are two ways to solve it:
First, in the production process, the free water in the dry product table, if the fiuidity is good, of course, the probability of aqglomeration wil be ow. t can be dried with hot air or dried with a roller.
Second, add anti-caking agent to the product.