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Method for preparing coated sustained-release calcium fertilizer from waste seafood shell

A coated slow-release, seafood shell technology, applied in layered/coated fertilizers, organic fertilizers, fertilization devices, etc., can solve the problems of soil compaction, difficult absorption of ordinary biological calcium, and achieve the effect of saving resources

Inactive Publication Date: 2016-03-16
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: Aiming at the problem that the application of too much calcium fertilizer causes soil compaction, and ordinary biological calcium is difficult to absorb, it provides a method of desalting waste seafood shells, followed by alkaline hydrolysis and suction filtration to prepare seafood chitosan Sugar, seafood chitosan is used to prepare the slow-release coating material, and the coated biological calcium is used to prepare a coated slow-release calcium fertilizer. After use, it can be maintained for a long time without applying calcium fertilizer and the fertilizer effect is remarkable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] First, select discarded scallops, swimming crab shells and shrimp skins, wash them three times with clean water, and dry them in an oven at 60°C for 10 hours. The 60-mesh waste seafood shell powder was prepared by sieving; the above waste seafood shell powder was divided into two parts, one part was placed in an oven at 60 °C for dry storage, and the other part was placed in a mass ratio of 1:5. Stir and mix in a hydrochloric acid solution with a concentration of 20%, remove inorganic calcium salts, wait for pickling for 2 hours to prepare pickled seafood shell powder, then filter it and collect the filter residue, and then mix the pickled seafood shells with a mass ratio of 1:5 The powder is soaked in 5% sodium hydroxide solution for 6 hours; after the soaking is completed, it is suction-filtered and the filter cake is collected, and then placed in a concentration of 3% In the hydrogen peroxide solution, heat it up to 40°C, oxidize and decolorize it for 2 hours, and pr...

example 2

[0018]First, select discarded scallops, swimming crab shells and shrimp skins, wash them with water for 4 times, and dry them in an oven at 65°C for 11 hours. The 70-mesh waste seafood shell powder was prepared by sieving; the above waste seafood shell powder was divided into two parts, one part was placed in an oven at 70 ° C for dry storage, and the other part was placed in a mass ratio of 1:5. Stir and mix in a hydrochloric acid solution with a concentration of 20%, remove inorganic calcium salts, prepare pickled seafood shell powder after pickling for 2.5 hours, then filter it and collect the filter residue, and then pickled seafood shell powder according to a mass ratio of 1:5. The shell powder is soaked in 5% sodium hydroxide solution for 7 hours; after the soaking is completed, it is suction filtered and the filter cake is collected, and then placed in a mass concentration of 3% according to the mass ratio of 1:3 In the hydrogen peroxide solution, heat it up to 42°C, ox...

example 3

[0020] First, select discarded scallops, swimming crab shells and shrimp skins, wash them 5 times with clean water, and dry them in an oven at 70°C for 12 hours. 80 mesh waste seafood shell powder was prepared by sieving; the above waste seafood shell powder was divided into two parts, one part was placed in an oven at 80 °C for dry storage, and the other part was placed in a mass ratio of 1:5. Stir and mix in a hydrochloric acid solution with a concentration of 20%, remove inorganic calcium salts, prepare pickled seafood shell powder after pickling for 3 hours, then filter it and collect the filter residue, and then mix the pickled seafood shells with a mass ratio of 1:5 The powder is soaked in 5% sodium hydroxide solution for 8 hours; after the soaking is completed, it is suction-filtered and the filter cake is collected, and then placed in a concentration of 3% In the hydrogen peroxide solution, heat it up to 45°C, oxidize and decolorize it for 3 hours, and prepare the deco...

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PUM

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Abstract

The invention relates to a method for preparing coated sustained-release calcium fertilizer from a waste seafood shell, which belongs to the field of preparation of sustained-release calcium fertilizer. The method provided by the invention is directed at the problems of soil hardening caused by excessive application of calcium fertilizer and difficulty in absorption of common bio-calcium and comprises the following steps: desalinating the waste seafood shell; then carrying out alkaline hydrolysis and pumping filtration so as to prepare seafood chitosan; preparing a sustained-release coating material from seafood chitosan; and coating treated bio-calcium. The sustained-release calcium fertilizer prepared in the invention can be automatically realized in soil and has an action period of 15 to 30 d; and through preparation of the fertilizer from the waste seafood shell, resources are saved, and greenness and environmental protection are realized.

Description

technical field [0001] The invention relates to a method for preparing coated slow-release calcium fertilizer from discarded seafood shells, belonging to the field of slow-release fertilizer preparation. Background technique [0002] Calcium fertilizer refers to a fertilizer with a marked amount of calcium (Ca). Applying to the soil can supply calcium to the plant and has the effect of regulating the acidity of the soil. The main variety of calcium fertilizer is lime, including quicklime, slaked lime and limestone powder. Gypsum and most phosphate fertilizers, such as calcium magnesium phosphate fertilizer, superphosphate, etc., and some nitrogen fertilizers such as calcium nitrate, lime nitrogen, etc. also contain a considerable amount of calcium. The effect of calcium fertilizer is related to soil type. Applying lime in calcium-deficient soil can not only supplement plants and soil with calcium, but also increase soil pH, thereby reducing or eliminating the harm to soil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05F1/005C05G5/30C05F11/00
Inventor 陈毅忠
Owner CHANGZHOU UNIV
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