1. The calcium content of fishbone and fish scales is mainly calcium phosphate, and the content varies from 58% to 62% depending on the type of fish. Its composition is close to the human skeleton and is one of the raw materials for preparing food grade calcium hydrogen phosphate. . When fish bone and fish scales are insufficient, supplementation with poultry, pigs, cattle, and bones is also a desirable option. Food-grade phosphate is one of the most used additives in the world, with an annual consumption of several hundred thousand tons, of which calcium hydrogen phosphate accounts for 30% of the total. China's food additive industry started late, has insufficient capacity, and imports a lot each year. The market prospects are broad.
Method: bone slag leaching method. Process Control Points:
1 rinsing with clean water, hammer, grind to 80-120 mesh sieve fineness; 2 deoiling, low boiling point solvent extraction, boiling range -37-8 Â°C; 3 acid leaching, 0-15 Â°C temperature, acid resistant tank series Continuous acid leaching, dilute hydrochloric acid concentration 2-3%; 4 adjust the PH value, enzymatic hydrolysis, Bacillus subtilis neutral protease 1.5%, temperature 50 Â°C, 6 hours; 5 membrane filtration; 6 The filtrate was concentrated to the water content of 18% into the molding; 7 Drying, hot air drying at 60Â°C to 12% moisture; 8 vacuum packaging.
Sensory index: pale white to light yellow colloid, used as food industry adhesives, emulsifiers, stabilizers.
Nutrients: protein, trace elements, amino acids, etc.
Submission: According to the Ministry of Health "Food Safety Toxicological Evaluation Procedure".
Second, the by-product dilute hydrochloric acid impregnating solution is rich in monocalcium phosphate and calcium chloride, can be used as raw materials for the preparation of food grade, toothpaste grade and pharmaceutical grade calcium hydrogen phosphate. The main points of the process are as follows:
1 Acid leaching solution purification; 2 Fluoride removal, de-fluorination with white carbon black and sodium chloride, toothpaste grade requirements fluorine â‰¤ 0.015%, food grade requirements â‰¤ â‰¤ 0.005%; 3 neutralization, acid solution after fluoride removal Neutralization with lime milk, control of PH3-5; 4 membrane filtration; 5 washing to neutrality, centrifugal separation; 6 airflow drying; 7 crushing filtration; 8 packaging.