Description:
Shell molluscan wrap up theca has a special glandulose cell
and the secretion of the cell can come into being calcify substance which can protect the soft part of the body. This is shell. The quantity, the shape
and the structure of the shell are very different
and always change.
The main composition of the shell is 95% calcium
and a spot of the chitin element. It has three layers. The outer layer is horniness layer (hull) which is black brown. It is thin
and transparence
and can prevent corrosion by the carbonic acid. It is formed by the chitin element. The middle layer is prism layer which is thick
and formed by the calcite which is excreted by the brim of the wrap up theca. The outer
and the middle layer can expand the proportion of the shell but can not increase the thickness of the shell .The inner layer is pearl layer (bottom layer) which is beautiful
and brightly. It can increase thickness with the body increase.
The shell powder not only contain a mass of calcium carbonate, but also have necessary microelements for the animal body, such as copper, magnesium, potassium, molybdenum, phosphor, manganese, iron, zinc
and so on. In addition, it has much amino acid composition in the pearl layer of the shell.
The produce process of the shell power: classify, clean by water, clean by alkali, kibble, dryness, classification by
air current mill.
The shell powder mainly used in feed additive, environment protection fertilizer, cropper, medicine, top grade fitment dope, improve soil, ornament procession, the stuffing of the macromolecule material
and so on.