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Preparation method of nano calcium carbonate

A technology of nano-calcium carbonate and calcium carbonate ore, which is applied in the fields of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., which can solve the problem that the product is harmful to the human body, cannot be applied in the field of food and medicine, and the steps are cumbersome, etc. question

Pending Publication Date: 2022-03-22
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the waste liquid containing the above-mentioned crystal form control agents pollutes the environment, and it is difficult to ensure complete removal during the cleaning process. The residue in the product may cause the product to be harmful to the human body. It cannot be used in the field of food and medicine, and the scope of use is limited.
Moreover, the existing methods for preparing nano-calcium carbonate often have complicated steps. Therefore, the present invention provides a non-toxic and harmless method for preparing nano-calcium carbonate with very simple steps.

Method used

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  • Preparation method of nano calcium carbonate
  • Preparation method of nano calcium carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Step 1: put the crushed, ground and screened calcium carbonate raw material into a muffle furnace for calcination at 1000°C.

[0025] Step 2: Take 5.6g of calcined calcium oxide, dissolve it in 200ml of deionized water, pour it into a three-necked flask, digest it in a water bath at 70°C, stir vigorously at 1000rpm with a magnetic stirrer for 3 hours, and age it for 24 hours after digestion.

[0026] Step 3: Place the flask in a water bath at 25° C. and vigorously stir at 1000 rpm with a magnetic stirrer.

[0027] Step 4: Insert the catheter with the porous quartz stone connected to the head below the liquid surface, as close to the bottom as possible, and inject carbon dioxide at a ventilation rate of 50ml / min.

[0028] Step 5: when ventilating for 45min, the solution pH=7, continued excessive ventilating for 30min, and ventilating for 75min, at this moment, the solution pH=6.78, stopped ventilating, and the product was suction filtered, washed and dried to obtain calc...

Embodiment 2

[0030] Step 1: put the crushed, ground and screened calcium carbonate raw material into a muffle furnace for calcination at 1000°C.

[0031] Step 2: Take 5.6g of calcined calcium oxide, dissolve it in 200ml of deionized water, pour it into a three-necked flask, digest it in a water bath at 70°C, stir vigorously at 1000rpm with a magnetic stirrer for 3 hours, and age it for 24 hours after digestion.

[0032] Step 3: Take 0.304g of xylitol, put it into a three-necked flask, place the flask in a 25°C water bath, and stir vigorously at 1000rpm with a magnetic stirrer.

[0033] Step 4: Insert the catheter with the porous quartz stone connected to the head below the liquid surface on the right side, as close to the bottom as possible, and inject carbon dioxide at a ventilation rate of 50ml / min. Samples were taken every 15 min for morphology observation.

[0034] Step 5: After the solution pH=7, continue to ventilate for 30min, at this moment, the solution pH=6, stop ventilating, th...

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Abstract

The invention discloses a preparation method of nano calcium carbonate, which comprises the following steps: calcining and decomposing calcium carbonate ore serving as a raw material into calcium oxide, then digesting and aging, adding a crystal form control agent, introducing carbon dioxide gas, carrying out water bath reaction, and monitoring the pH value of the solution; after the pH value reaches 7, the carbon dioxide gas is still continuously introduced to enable the carbon dioxide gas to be over-carbonized until the pH value reaches 6 or below, gas introduction is stopped, filtering, washing and drying are conducted in time, and the nano calcium carbonate is prepared. The carbon dioxide is continuously introduced after the calcium hydroxide is completely consumed, so that the nano calcium carbonate at a relatively weak link part in the chain-shaped nano calcium carbonate is re-dissolved to generate calcium bicarbonate, and the particles are separated to obtain the monodispersed nano calcium carbonate. The method is simple and controllable, is suitable for industrial production, and can be used for preparing nano calcium carbonate with good monodispersity and uniform particles.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanometer materials, and relates to a method for preparing nano calcium carbonate, in particular to a method for preparing nano calcium carbonate with uniform particles and good dispersibility based on overcarbonization. Background technique [0002] Nano-calcium carbonate is a functional filling material, which is widely used in rubber, plastics, papermaking, adhesives and other industries. a special function. [0003] According to different production methods, calcium carbonate can be divided into heavy calcium carbonate and light calcium carbonate. Heavy calcium carbonate is to reduce the particle size of calcium carbonate through physical grinding. Due to the limitation of grinding equipment, it is almost difficult to use The particle size of calcium carbonate is less than 1000nm. Light calcium carbonate is through the method of chemical reaction, the calcium carbonate that ...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/183C01F11/181C01P2004/61C01P2004/01Y02P20/141
Inventor 商登奎周倪凡戴正冠宋能宇杜丕一王宗荣
Owner ZHEJIANG UNIV
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