Is it better to use a weighing grab or a weighing belt for metered feeding?

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What enters is ferrous sulfate heptahydrate in bulk. Currently, it is first packed into ton bags, and then fed in using a crane along with a spring scale for measurement. However, it is necessary to cut open the bags before feeding the material in, as the material contains some moisture and tends to form clumps when under pressure. This way, the cost of manually adding packaging bags is too high. I want to use bulk material and load it directly into the feed bin with a loader; then, for feeding, is it better to use a weighing grab or a weighing belt? Two factors need to be considered: first, ferrous sulfate heptahydrate cannot be stored for long; before adding new material, the contents in the silo must be used up ； Second, ferrous sulfate is not in the form of loose particles or crystals; it has some degree of sticking and caking. Please discuss the design of the silo as well as the weighing and feeding of materials, and offer some suggestions. Thank you!