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Method and device for producing nano calcium carbonate by microwave drying

A nano-calcium carbonate, microwave drying technology, applied in calcium carbonate/strontium/barium, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem of affecting the quality of nano-calcium carbonate products and long drying time of filter cakes , Reduce product whiteness and other issues, achieve the effect of improving the production environment, fast heating speed, and improving whiteness

Active Publication Date: 2014-12-24
FUJIAN HONGFENG NANO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a process is applicable to the production of nano-calcium carbonate powder with a particle size ≥ 50nm, but if the particle size of the produced nano-calcium carbonate powder is ≤ 50nm, due to the small particle size and large specific surface area, the gap between particles The combination is large, the nano-calcium carbonate particles are easy to agglomerate, forming soft and hard agglomerates, causing coarse particles to appear in the product, easy to form secondary agglomerates, difficult to disperse during application, and the use effect is poor, which affects the quality of nano-calcium carbonate products quality
Moreover, with these conventional drying methods, the filter cake takes a long time to dry, and usually takes several hours to dry, which consumes a lot of energy and reduces the whiteness of the product.

Method used

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  • Method and device for producing nano calcium carbonate by microwave drying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method utilizing microwave drying to produce nano-calcium carbonate is implemented according to the following steps:

[0026] ①Preparation of Ca(OH) 2 Raw seminal pulp: calcined with limestone to obtain calcium oxide, which is digested with water to obtain Ca(OH) 2 Raw pulp, then aged, sieved to remove impurities, and prepared Ca(OH) 2 seminal plasma;

[0027] ②Calcium carbonate cooked pulp: adjust Ca(OH) 2 The temperature and mass percent concentration of raw seminal plasma, temperature is controlled at 20 ℃, and mass percent concentration is controlled at 10%, then Ca(OH) 2 Raw seminal pulp is added to the bubbling carbonization tower reactor and CO 2The gas is carbonized by bubbling and carbonized, and the carbonization is stopped when the pH of the slurry is less than or equal to 7.5, and the calcium carbonate cooked slurry is obtained;

[0028] ③Preparation of active calcium carbonate filter cake: add surface treatment agent to the calcium carbonate cooked p...

Embodiment 2

[0033] A method utilizing microwave drying to produce nano-calcium carbonate is implemented according to the following steps:

[0034] ①Preparation of Ca(OH) 2 Raw seminal pulp: calcined with limestone to obtain calcium oxide, which is digested with water to obtain Ca(OH) 2 Raw pulp, then aged and sieved to remove impurities to obtain Ca(OH) 2 seminal plasma;

[0035] ②Calcium carbonate cooked pulp: adjust Ca(OH) 2 The temperature and mass percent concentration of raw seminal pulp, temperature is controlled at 8 ℃, and mass percent concentration is controlled at 5%, then Ca(OH) 2 Raw seminal pulp is added to the bubbling carbonization tower reactor and CO 2 The gas is carbonized by bubbling and carbonized, and the carbonization is stopped when the pH of the slurry is less than or equal to 7.5, and the calcium carbonate cooked slurry is obtained;

[0036] ③Preparation of active calcium carbonate filter cake: add surface treatment agent to the calcium carbonate cooked pulp,...

Embodiment 3

[0041] A method utilizing microwave drying to produce nano-calcium carbonate is implemented according to the following steps:

[0042] ①Preparation of Ca(OH) 2 Raw seminal pulp: calcined with limestone to obtain calcium oxide, which is digested with water to obtain Ca(OH) 2 Raw pulp, then aged, sieved to remove impurities, and prepared Ca(OH) 2 seminal plasma;

[0043] ②Calcium carbonate cooked pulp: adjust Ca(OH) 2 The temperature and mass percent concentration of raw seminal pulp, temperature is controlled at 25 ℃, and mass percent concentration is controlled at 12%, then Ca(OH) 2 Raw seminal pulp is added to the bubbling carbonization tower reactor and CO 2 The gas is carbonized by bubbling and carbonized, and the carbonization is stopped when the pH of the slurry is less than or equal to 7.5, and the calcium carbonate cooked slurry is obtained;

[0044] ③Preparation of active calcium carbonate filter cake: add surface treatment agent to the calcium carbonate cooked pu...

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Abstract

The invention discloses a method for producing nano calcium carbonate by microwave drying. The method is carried out according to the following steps: (1) preparing Ca(OH)2 raw refined slurry; (2) preparing boiled calcium carbonate slurry; (3) preparing an activated calcium carbonate filter cake; (4) pelletizing; (5) carrying out microwave drying; and (6) crushing and sieving to prepare a nano calcium carbonate product. A device for producing nano calcium carbonate by microwave drying comprises a pelletizer, a feeding hopper, a conveyor belt, a transmission mechanism, a tunnel type microwave drying box, a microwave generator, a discharge hopper and a moisture removal mechanism. The method and the device are adopted to produce nano calcium carbonate, so that time of drying operation in a production process of the nano calcium carbonate can be greatly shortened, the energy consumption is lowered, the agglomeration of the nano calcium carbonate is weakened and the dispersion is improved, and thus, the quality of the nano calcium carbonate is improved; the prepared nano calcium carbonate has the advantages of small grain size, low agglomeration strength, a great specific surface area, small hardness and good dispersion; and moreover, the heating time is short, so that the whiteness of the nano calcium carbonate can be improved.

Description

technical field [0001] The invention relates to the technical field of nano-calcium carbonate production, in particular to a method and device for producing nano-calcium carbonate by microwave drying. Background technique [0002] Nano-calcium carbonate is a new type of ultra-fine solid powder material developed in the 1980s, with a particle size between 0.01 and 0.1 μm. Due to the superfineness of nano-calcium carbonate particles, its crystal structure and surface electronic structure change, resulting in quantum size effects, small size effects, surface effects and macroscopic quantum effects that ordinary calcium carbonate does not have. It can be widely used in plastics, Rubber, paint, ink, sealing adhesive materials, coatings and other fields. [0003] Due to the strong hydrophilic groups on the surface of nano-calcium carbonate, the affinity between nano-calcium carbonate and polymers is poor, and nano-calcium carbonate has extremely high free energy and polarity. Ha...

Claims

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Application Information

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IPC IPC(8): C01F11/18B82Y30/00
Inventor 邹林富刘亚雄雷水根
Owner FUJIAN HONGFENG NANO TECH
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