Calcium is an exogenous inorganic mineral element and is one of the most abundant mineral elements in the animal body, accounting for about 0.5% of the animal's weight. Calcium is the main component of the bones and eggshells of the livestock and poultry. At the same time, it maintains the normal excitability of muscles and nerves, reduces the permeability of capillaries and participates in the coagulation of blood, regulates metabolism and activates enzymes. Among them, the content of calcium in the eggshell is >35%. During the egg laying period, 60% of the eggshell is directly supplied by the feed, and the remaining calcium is supplied by the bone calcium, and the latter is supplemented by the feed. It is also involved in blood coagulation, together with sodium and potassium to maintain the normal function of the heart and muscles and the acid-base balance.
Gypsum as a feed additive can increase the laying rate of laying hens. Grind the raw gypsum into fine powder, feed it according to the ratio of 1.0%~1.5% of the diet, or feed 0.5~3.0g, and eat it freely, which can increase the egg production rate by 12%. Gypsum can accelerate moulting. During natural moulting or artificial moulting, adding gypsum as described above can accelerate feather growth and shorten moulting time.
adding 0.5g of raw gypsum powder to the diet of long-haired rabbits, the free-feeding can increase the yield of rabbit hair by about 20%, and the quality and grade of rabbit hair are also obviously improved, from the third-grade hair to the second-level hair.
Adding 1.5% raw gypsum powder to the piglet diet can increase the piglet weight by about 6kg and save feed. A Japanese pig research institute developed a new type of pig feed additive using computer formula. Its composition is (by weight): zeolite powder 45%, salt 10%, calcium sulfate 14.4%, and other 30.6%. The additive was added to the pig diet at a ratio of 5% to 8%. The increase in pig weight was 30% to 50% higher than that of the control group, and the feed consumption was reduced by about 30%. At the same time, there is no need to give the pig deworming, gastric lavage and so on
CaSO4(Calcium sulphate) as a calcium source has the effect of increasing the calcium content of the cow's milk source, increasing the milk production, and adding with the salt (sodium chloride) has the effect of improving the appetite of the cow.
The main application in aquaculture is calcium sulphate hemihydrate (calcined gypsum), which can be used as an aggregate of fish food, and can also be used as raw material for producing ammonia water. The effect is better than the commercially available ammonia water, and the cost is saved. Green safe. Raw gypsum is used less in aquaculture, mainly as a processing material for cryopreservation of crab and shrimp. The principle is that gypsum can inhibit the nerve stress reaction to a certain extent, reduce the vascular permeability, and thus inhibit the activity of crab and shrimp.
Calcined gypsum can be used as an additive to add chicken manure feed, but it should also be noted that when using chicken manure feed, it is better to add antibiotics such as oxytetracycline and salt, baking soda and other food additives.
For the application of gypsum in powder, we have customer sites in many countries. For example, we have a coarse powder field for processing dolomite in Gujarat, India. At the time, the customer requested 200 mesh processing and the screening rate was D99. The current output of the equipment is stable and the output can reach 8 tons. The customer uses the new MTW series European version of the trapezoidal mill for our Shanghai Zenith Mining Machinery Co., Ltd. Compared with the traditional mill, the MTW mill of Zenith has the advantages of low energy consumption, high output and low noise when the host power is 90KW.
The following is a specific comparison between the MTW mill and the conventional mill at a host power of 90 kW.