Liming method for preparing bone gelatin and application

Abstract

The invention provides a liming method for preparing bone gelatin and application. The liming method comprises the step of conducting liming by utilizing a saturated calcium hydroxide solution. The liming method provided by the invention can reduce bone consumption and improve gelatin quality; meanwhile, waste of raw and auxiliary materials such as quick lime and water can be reduced, emission of solid waste is reduced, and safety and environmental protection are achieved; and the liming period can be shortened, the efficiency is improved, and the production automation level is improved.

Description

technical field [0001] The invention belongs to the technical field of preparing gelatin, and relates to a liming method and application for preparing bone gelatin. Background technique [0002] In the existing processing method for bone raw materials for gelatin, it mainly includes smashing bones, degreasing, sorting, pickling, liming and neutralization and washing several processes. For the liming process, it is generally used to make calcium hydroxide emulsion with quicklime (calcium oxide content of 65-90%) and water, and then according to the process requirements, it is made into calcium hydroxide emulsion of different concentrations and added to the liming tank to make the bone particles Soak in the liming tank, agitate several times a day with low-pressure air, and replace the lime milk regularly until the bone grains "mature" in the liming stage. [0003] At present, the following problems generally exist in the use of calcium hydroxide emulsion for liming: [0004...

AI Technical Summary

Problems solved by technology

[0004] First, the consumption of raw and auxiliary materials is large

Because calcium hydroxide is slightly soluble in water, the calcium hydroxide emulsion with high concentration cannot dissolve into the bone particles during the liming stage, resulting in a large amount of ash milk flowing into the waste liquid treatment stage, resulting in waste; Agitation causes friction between bone particles and between bone particles and the liming tank to produce a large number of fine bone particles, which will flow out with the waste liquid, resulting in waste of aggregate; at the same time, repeated washing is required when replacing the calcium hydroxide emulsion, resulting in waste of water

[0005] Second, the product quality cannot be stably controlled

Impurities in calcium hydroxide enter the capillary pores of bone particles, which are difficult to clean and may affect the light transmittance of gelatin; at the same time, the temperature of calcium hydroxide emulsion formed by the reaction of quicklime and water is not easy to control, and the hydrogen distributed on the surface of bone particles The uneven distribution of calcium oxide leads to uneven maturity of bone, which directly leads to gelatin viscosity and dynamic instability; and, due to air agitation, carbon dioxide in the air reacts with calcium hydroxide to form calcium carbonate precipitation, and calcium carbonate particles enter the bone. In the capillary pores of the gelatin, blocking the capillary pores of the gelatin is not only unfavorable for the maturation of the bone pellet, but also the neutralization process requires a large amount of tap water washing, which can easily lead to a decrease in the light transmittance of the gelatin

[0006] The third is to increase the environmental load

A large amount of excess calcium hydroxide emulsion causes more solid waste. At present, the monthly production of 400 tons of gelatin is about 4,000 tons of solid waste; the fine bone particles produced flow into the subsequent environmental protection treatment system with the waste liquid, resulting in high total nitrogen, while the total nitrogen Most of them exist in the form of organic nitrogen, which is difficult to handle

[0007] Fourth, the cost is higher

The production cycle is longer and the occupied area is larger, which indirectly increases the cost; due to the need to replace the calcium hydroxide emulsion and the increased labor cost due to air agitation

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