1. Differences in appearance: Zinc sulfate monohydrate is a white smooth powder, and zinc sulfate heptahydrate is a white crystalline powder. Zinc sulfate monohydrate particles and zinc sulfate heptahydrate particles are difficult to distinguish in appearance, and can only be distinguished by detecting the content.
2. The difference in internal control content: the zinc content of zinc sulfate monohydrate powder is more than 35%, while that of zinc sulfate heptahydrate powder is more than 21.5%. The zinc content of the zinc sulfate monohydrate particles is more than 33%, and the zinc content of the zinc sulfate heptahydrate particles is more than 21%. The granules are made of powder by disc granulation, and the zinc content is lost, so the zinc content of the granules will be lower than that of the powder.
3. Water solubility: Because zinc sulfate heptahydrate contains 7 water molecules, the water solubility of all zinc sulfate heptahydrate is better than that of zinc sulfate monohydrate. However, the production quality control will qualify the water-insoluble matter of general zinc sulfate as a qualified product within 0.05%. In addition, both can be used as water-soluble fertilizers, and the specific use method can be determined according to the needs.
4. Difference in market price: The price of zinc sulfate is generally determined according to the zinc content of the product. The higher the content, the higher the price. Therefore, the price of zinc monohydrate powder is more expensive than that of zinc heptahydrate powder. The reason why zinc sulfate particles are more expensive than zinc sulfate powder is that the cost of manufacturing zinc sulfate particles has an increase in labor costs.
