Preparation of monocalcium phosphate and dicalcium phosphate_industrial additives

Background and overview^[1]

Monocalcium phosphate is a resonance crystal of calcium dihydrogen phosphate and calcium hydrogen phosphate. Feed grade monocalcium phosphate is a mineral feed additive whose performance is between feed grade calcium dihydrogen phosphate and feed grade calcium dihydrogen phosphate, and its basic composition is calcium hydrogen phosphate and dicalcium phosphate. Phosphorus includes both water-soluble phosphorus and citrus-soluble phosphorus. Therefore, it is suitable for both livestock and poultry feeds and aquatic feed additives. This variety is gradually being promoted in the feed industry in China and has been widely used abroad. usage of.

Currently in the feed industry, especially in China, the commonly used calcium phosphate feed additives are calcium hydrogen phosphate and dicalcium phosphate. Monocalcium and dicalcium phosphate are a new calcium phosphate feed additive in China. According to the composition of monophosphate and diphosphate, some manufacturers use calcium hydrogen phosphate and dicalcium phosphate to physically mix them in a certain proportion to produce monocalcium phosphate.

Apply^[2-3]

CN201910442027 discloses a meat duck feed, including the following raw materials by weight: 200-250 parts of corn, 150-220 parts of wheat, 75-96 parts of duck oil, 13-33 parts of Enteromorpha powder, and 18 parts of corn gluten meal -33 parts, 185-225 parts of secondary flour, 7-14 parts of feather meal, 66-73 parts of peanut meal, 37-49 parts of sprayed corn germ meal, 53-71 parts of sugar residue, 11-23 parts of stone powder, 70% Lysine sulfate 8-17 parts, distillers grains 64-83 parts, monocalcium phosphate 3.7-5.4 parts, sodium chloride 1.9-3.7 parts, methionine 0.86-1.74 parts, threonine 1.07-1.65 parts, choline 0.75 -1.73 copies. The present invention configures enteromorpha powder, methionine, threonine, and corn and wheat as main ingredients in the feed, and the average daily weight gain and feed intake of the meat ducks are increased by the Huntsman metal complex dye. It effectively improves the quality of duck meat and increases the lean meat rate of meat ducks. The invention has a wide source of raw materials, effectively reduces costs, is safe, has no toxic side effects, reduces the use of antibiotics and other drugs, and effectively improves the immunity of meat ducks.

CN201010272711.6 discloses a feed for 817 broiler breeders, which is composed of the following components by weight: 170 to 230 parts of monocalcium phosphate, 150 to 250 parts of stone powder, 40 to 60 parts of salt, and baking soda 20~40 parts, choline 15~25 parts, complex trace elements 40~45 parts, multivitamin 8~10 parts, vitamin C 1~3 parts, methionine 20~25 parts, fish meal 50~100 parts, zeolite powder 220~470 parts 1 to 3 parts of Bacillus subtilis, 2 to 5 parts of phytase, and 2 to 4 parts of compound enzyme preparation. The feed of the present invention is obtained after many years of practice. The present invention adds nutritional additives and the like to the feed to produce broiler breeder feed that can significantly enhance the immunity of 817 broiler breeder chickens, improve the hatching rate and the survival rate of chicks. Significantly improved.

CN201910442025 discloses a feed for breast-enhancing sows, including the following raw materials by weight: 580-650 parts of corn, 80-120 parts of sub-rice, 15-25 parts of soybean oil, 180-230 parts of soybean meal; 8-23 parts of fish meal 99% Methionine 0.8-3 parts, 98.5% threonine 0.5-1.2 parts; vitamin premixed feed 0.6-3.8 parts, trace element premixed feed 0.8-4.3 parts; sweetener 0.1-1.2 parts, sodium bicarbonate 0.4-2.3 parts , 0.2-1.4 parts of mildew removal agent, 0.1-0.6 parts of essential oil, and 3-15 parts of glucose. The present invention contains enteromorpha powder, which meets the nutritional needs of lactating sows and improves the sow’s milk production and milk quality; the present invention can improve the digestibility and utilization rate of nutrients, improve the quality of sow feces, and reduce The occurrence of constipation.

Preparation^[1]

Production method of feed grade monocalcium phosphate and dicalcium phosphate:

Weigh 50Kg of 85% phosphoric acid, add 50Kg of wet phosphoric acid defluoridation solution (13.2% calcium dihydrogen phosphate solution containing P₂O₅), and mix well ; Add 161Kg calcium hydrogen phosphate to the mixing reactor, and at the same time add the above-mentioned dilute phosphoric acid. After the materials are evenly mixed, enter the air flow dryer for drying, use a classifier to classify, and use a 2mm sieve to sieve the remaining waterproofing agent with a pulverizer. After crushing, it is dried in an air flow dryer, and finally 126Kg of granular monocalcium phosphate and 82Kg of powdered monocalcium phosphate are obtained. Their technical indicators are as follows:

Granular product: Total phosphorus content (calculated as P) 22.92% Water-soluble phosphorus content (calculated as P) 14.67%

Calcium content (calculated as Ca) 19.59% Moisture 2.08%

Fluorine, arsenic and lead qualified

Powdered product: Total phosphorus content (calculated as P) 22.86% Water-soluble phosphorus content (calculated as P) 14.11%

Calcium content (calculated as Ca) 19.44% Moisture 1.81%

Fluorine, arsenic and lead qualified

Figure 1 is a schematic diagram of the production process flow of feed grade monocalcium phosphate and dicalcium phosphate: