Method for preparing industrial gelatin and industrial protein powder by using waste leftover materials of leather

Abstract

The invention discloses a method for preparing industrial gelatin and industrial protein powder by using waste leftover materials of leather, and belongs to the technical field of leather waste recycling. The method comprises the following steps of alkali soaking and cleaning-pickling-water washing-extracting, the leather leftover materials are soaked in alkali to form chromium hydroxide flocculent precipitate by most chromium and hydroxide radical ions in the leather leftover materials, wherein the removal rate reaches more than 98%; the residual heavy metal chromium in the leather leftover materials can be removed by acid washing to generate soluble chromium sulfate salt; water washing is carried out to remove a small amount of impurities remaining in the inner layer of the skin and opena skin fiber interstitial channel, and the water washing is carried out until the pH value is neutral; in the extraction process, the upper layer glue solution is concentrated and used for preparingindustrial gelatin, and the residual precipitate is subjected to secondary extraction and is concentrated and used for preparing industrial protein powder. According to the invention, the leather leftover materials can be effectively treated, the environmental pollution and the treatment cost are reduced, industrial products are formed, the economic benefits are generated, and the economic and social benefits caused by changing waste into valuable are achieved.

Description

technical field [0001] The invention belongs to the technical field of leather waste recycling, and in particular relates to a method for preparing industrial gelatin and industrial protein powder from leather waste leftovers. Background technique [0002] At present, many leather production, processing and recycling enterprises will produce a large amount of leather scraps in their production and operation process. The leather scraps produced are mainly wet blue leather, finished leather scraps, etc., and their main components are solidified denatured proteins containing heavy metal chromium , about 15% of the total scraps are used as raw materials for the production of recycled leather, and most of the rest are difficult to be used as raw materials for the production of recycled leather, so they have to be mixed with other industrial wastes for removal and treatment, and have not been effectively disposed of. Greater environmental pollution and potential safety hazards. ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing industrial gelatin and industrial protein powder by using waste leather leftovers, aiming to solve the above-mentioned prior art that leather leftovers cannot be effectively disposed of with garbage removal, and there are environmental pollution and potential safety hazards question

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