Preparation method for preparing novel environment-friendly non-toxic dust-free high-quality seashell chalk from waste shells

Abstract

The invention discloses a preparation method for preparing a novel environment-friendly non-toxic dust-free high-quality seashell chalk from waste shells, and the method comprises the following steps: 1, cleaning the waste shells with clear water, bleaching in hydrogen peroxide, and performing drying in an environment of 100 DEG C; 2, crushing the shells dried in the step 1 into 200-300 meshes by using a mechanical stirring crusher, and performing calcining at 900-950 DEG C for 130-150 minutes to obtain calcium oxide powder; 3, introducing carbon dioxide gas at a proper rate on the basis of the step 2, continuously performing heating, and performing reacting to obtain calcium carbonate powder with higher purity; 4, heating glycerol and water according to a ratio of 1: 60 to prepare a milky white solution, and fully mixing the milky white solution with polyvinyl alcohol according to a certain ratio by utilizing the loose and porous structural characteristics of shell powder, so when teachers and students use the chalk, serious damage of dust generated by the chalk to skins and respiratory tracts can be reduced, and the practicability of the seashell chalk is greatly improved.

Description

technical field [0001] The invention relates to the technical field of preparation of "sea shell" powder materials and "sea shell" chalk production technology, in particular to a preparation method of new environment-friendly, non-toxic and dust-free high-quality "sea shell" chalk made from discarded shells. Background technique [0002] There are a large number of discarded shells in the Beibu Gulf area of ​​my country, piled up into mountains, which not only occupy land resources, but also pollute the environment. Moreover, my country has a vast sea area and many lakes are rich in shellfish resources, such as scallops, scallops, oysters, clams, etc. With the rapid development of the marine shellfish farming industry, the annual output has reached tens of millions of tons in recent years. The development of the shellfish farming industry not only provides people with delicious seafood and meat, but also leaves a lot of waste for people-shells, discarded shells It has caused s...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method that utilizes discarded shell to make the high-quality " sea shell " chalk of novel environmental protection non-toxic and dust-free, to solve the problem that the chalk on the market at present proposed by the above-mentioned background technology will be damaged during long-term use. The skin is damaged, and when the chalk is used, the dust is suspended in the air, causing serious damage to the respiratory system of teachers and students

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