Preparation method of high-quality environment-friendly dust-free shell chalk prepared from waste shells

A high-quality, shell powder technology, applied in applications, pencil leads, household appliances, etc., can solve the problem of reducing chalk dust rate, achieve the effect of reducing chalk dust rate, solving environmental protection problems, and eliminating hazards

CN110294979AInactive Publication Date: 2019-10-01LINGNAN NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-10-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a preparation method of a high-quality environment-friendly dust-free shell chalk made of waste shells, and belongs to the technical field of chalk preparation. The high-quality environment-friendly dust-free shell chalk is suitable for classroom teaching. The method comprises the following steps of: carrying out ultrasonic cleaning and hydrogen peroxide bleaching on the waste shells; crushing the treated shells into 200-mesh shell powder; carrying out microscopic morphology analysis on the shell powder by using a scanning electron microscope (SEM) to show a loose porous structure; according to the special structure of the shell powder, adding a water-soluble binder prepared by mixing polyethylene alcohol and water according to a ratio of 1: 50 into the shell powder, adding talcum powder as a lubricant, or adding a pigment to prepare a colored dust-free shell chalk; and drying the prepared chalk to obtain the high-quality, environment-friendly non-toxic dust-free shell chalk. The dust rate of the chalk prepared by the method is obviously reduced, the probability of causing respiratory discomfort or even diseases of teachers and students is greatly reduced,the skin of the teachers is not corroded, and the health of the teachers and students is protected.
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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 technical field of chalk production technology. Background technique

[0002] The Beibu Gulf region of my country is rich in shellfish resources, such as oysters, abalone, scallops, geoduck, concubine snails, and scallops. Because of its delicious meat and high nutritional value, it is eaten by more and more people. In recent years, the shellfish farming industry has developed rapidly, and the annual output has reached 10 million tons. Because people fail to effectively deal with "shell garbage", a large number of discarded shells are randomly thrown away in seafood markets, restaurants and other places, seriously polluting the environment. Therefore, how to effectively deal with discarded shells and realize the environmental protection concept of "turning waste into ...

Examples

Embodiment 1

[0025] A kind of preparation method that utilizes discarded shell to prepare high-quality environment-friendly dust-free shell chalk, concrete steps are as follows:

[0026] 1. Preparation of shell powder

[0027] Ultrasonic cleaning, hydrogen peroxide bleaching of discarded shells, and mechanical crushing into 200-mesh shell powder;

[0028] 2. Preparation of water-soluble binder

[0029] Add polyvinyl alcohol and water into the aluminum pot at a ratio of 1:50, put the pot on the stove to heat, and stir for 30-50 minutes while heating, until the polyvinyl alcohol is completely melted, and the total weight of the reagent accounts for the unboiled 75%-80% of the time of preparation, and take the white solution as the standard to obtain the water-soluble binder;

[0030] 3. Preparation steps of shell chalk

[0031] (1) After fully mixing the shell powder and water-soluble binder, add talcum powder, if you need to make colored chalk, you can add an appropriate amount of pigmen...