Wet-method preparation and activation method of nanometer calcium carbonate

A technology of nano-scale calcium carbonate and activation method, which is applied in the field of nano-scale calcium carbonate wet preparation and activation, can solve the problems of large calcium carbonate particle size, high calcination temperature, and slow speed, and achieve uniform particle size, short calcination time, The effect of increasing the activation rate

Inactive Publication Date: 2019-02-12
NANJING AIFENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carbonization method in the prior art prepares nanoscale calcium carbonate and has the following problems: 1. In the existing calcination technology, the temperature of calcination and the particle diameter oil pipe of calcination, when the existing calcination furnace calcines, the calcination temperature after calcination is 900 When the calcination temperature is 1000 degrees Celsius, it can burn through 3.3mm of limestone per hour; if the cal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A nanoscale calcium carbonate wet preparation activation method, comprising the following steps:

[0022] In the first step, limestone is calcined, limestone is crushed, crushed by a crusher, and the crushed particle size is 1-2cm, and then put into a calciner for calcining, the calcining time is 120-360min, and the temperature is 900 degrees Celsius. A fluidized bed is provided, and the limestone particles are fluidized and calcined in the fluidized bed; quicklime is obtained;

[0023] In the second step, add water to the quicklime obtained in the first step, stir to obtain slaked lime, and stir for 30-60min;

[0024] The third step, slaked lime activation: put slaked lime into the activation reaction kettle, continue to add water, and at the same time, heat and stir, the heating temperature is 45-65 degrees Celsius, pass carbon dioxide bubbles into the activation device, add activator while stirring, and accelerate Activate; get wet calcium carbonate

[0025] The 4t...

Embodiment 2

[0031] In the present invention, the activator includes a regulator, a coupling agent, and a lubricant, wherein the regulator is an acrylate regulator, and the coupling agent is selected from an aluminate coupling agent, a titanate with a mass ratio of 1:1 The number of parts is compounded; the coupling agent is compounded with polyethylene wax and stearic acid in any proportion.

[0032] The rest of the preparation method is the same as in Example 1, and will not be repeated here.

Embodiment 3

[0034] In the present invention, the activator includes a regulator, a coupling agent, and a lubricant. The regulator is an acrylate regulator, and the coupling agent is an aluminate coupling agent, a titanate coupling agent, and a silane coupling agent. : Compounded in parts by mass of 1.5:2, the lubricant is compounded in parts by mass of monoglyceride stearate and paraffin wax in parts by mass of 1:1.5.

[0035] The rest of the preparation method is the same as in Example 1, and will not be repeated here.

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Abstract

The invention discloses a wet-method preparation and activation method of nanometer calcium carbonate. Limestone is calcined and crushed, wherein a crusher is adopted for crushing, the crushed particle size is 1-2 cm, then limestone particles are put into a calcinator for calcining, calcining time is 120-360 min, temperature is 900 DEG C, in a calcining process, a fluidized bed is arranged in thecalcinator, and the limestone particles are subjected to fluidized calcining in the fluidized bed; quicklime is obtained, water is added, stirring is conducted to obtain slaked lime, and stirring is conducted for 30-60 min; the slaked lime is put into an activation reaction kettle, water adding is continued, meanwhile, heating is conducted for stirring, heating temperature is 45-65 DEG C, in an activation device, carbon dioxide is introduced for bubbling, and an activator is added while stirring to accelerate activation; wet calcium carbonate is obtained; after sedimentation and filtering areconducted, a filter press is used for filter pressing; the wet calcium carbonate subjected to press filtering is dried. The activation method has the advantages that the calcining speed is higher thanthat in the prior art, a calcining effect is good, and energy consumption is saved; the activation rate is improved.

Description

technical field [0001] The invention relates to the field of wet activation of calcium carbonate, in particular to a nanoscale calcium carbonate wet preparation and activation method. Background technique [0002] In recent years, with the development of calcium carbonate technology, calcium carbonate products are increasingly showing a trend of nanoscale, and generally light calcium carbonate with an average particle size of 1-100nm becomes nano calcium carbonate. The advantages of nano-calcium carbonate are: small particle size, the average particle size is 50nm, the larger the specific surface area, more than three times larger than ordinary calcium carbonate; after the surface is activated, the activation rate is high, the whiteness is high, and it is suitable for light-colored products. Nano-scale calcium carbonate is mainly used in: rubber, plastics, advanced inks, coatings and other fields. [0003] The preparation methods of nano-scale calcium carbonate in the prior...

Claims

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Application Information

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IPC IPC(8): C01F11/18B82Y30/00C04B2/10
CPCC01F11/183B82Y30/00C04B2/106
Inventor 王爱兵
Owner NANJING AIFENG TECH CO LTD
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