Method for preparing non-toxic dust-free shell chalk from discarded shells

A shell and chalk technology, applied in applications, pencil leads, household appliances, etc., can solve the problems of teachers and students' respiratory system damage, skin damage, and inconspicuousness, and achieve the goal of reducing chalk dust, reducing ecological environment damage, and reducing energy consumption. The effect of loss
CN110229560AInactive Publication Date: 2019-09-13LINGNAN NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LINGNAN NORMAL UNIV
Publication Date
2019-09-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for preparing non-toxic dust-free high-quality shell chalk from discarded shells, belonging to the technical field of production of the teaching tool--chalk. The preparation method comprises the following steps: calcining washed shells at a temperature of 850 DEG C for 120 minutes to obtain calcium oxide powder; introducing carbon dioxide and continuing calcination to obtain high-purity calcium carbonate; and mixing diol and water according to a ratio of 1: 40 to form a water-soluble binder, then carrying out molding in a mold, and performing drying to obtainthe high-quality shell chalk. The chalk prepared by using the method effectively reduces chalk dust in the air, does not corrode the skin of teachers' fingers, and protects the health of teachers andstudents.
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Description

technical field

[0001] The invention relates to a preparation method of chalk, in particular to a preparation method of using discarded shells to make non-toxic and dust-free shell chalk, which belongs to the field of chalk production technology. Background technique

[0002] my country has many lakes, vast sea area, and rich shellfish resources, such as oysters, mussels, meretrix meretrix, and snails. With the rapid development of shellfish farming, the annual output has reached tens of millions of tons in recent years. In addition to providing people with delicious meat, shellfish also leave a lot of shell waste for people. Abandoned seashells have caused serious damage to the ecological environment of coastal areas and also affected people's lives. Therefore, the rational use of discarded shells is imminent. We use discarded shells to develop teaching chalk, so as to provide a way to deal with shells in coastal areas of China.

[0003] At present, the chalks used in Chi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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