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Method for preparing nano calcium carbonate coated fly ash ultrafine powder

A technology of nano-calcium carbonate and fly ash, which is applied in chemical instruments and methods, inorganic pigment treatment, dyeing organosilicon compound treatment, etc. It can solve the problems of not meeting the technical requirements of fly ash, filling amount limitation, poor compatibility, etc. , to achieve the effect of good effect, large filling amount and good compatibility

Inactive Publication Date: 2014-03-19
HUAINAN LANCAI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its smooth surface and poor compatibility with the polymer matrix, the interface between the fly ash and the matrix may become the weak link of the composite material. The inherent defects of the fly ash itself restrict its use in the polymer The application of fly ash can not meet the technical requirements of rubber and plastic filler, and the filling amount is also greatly restricted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the fluidized bed, the fly ash that has been screened to remove iron beads, carbon particles, and ultrafine grinding (grinding fineness: 32 μm sieve residue ≤ 8%) is soaked and activated in saturated lime water for 24 hours, and then filtered and dried (dried The temperature is above 105°C) to increase the active points (surface hydroxyl groups) on the surface of fly ash to achieve the effect of activation. The oxidized polyethylene emulsion (the oxidized polyethylene emulsion of nano-calcium carbonate is that nano-calcium carbonate is mixed with oxidized polyethylene emulsion in a ratio of 30% by weight after the oxidized polyethylene emulsion of the activated fly ash and atomized nano-calcium carbonate is uniformly mixed in the colloid Homogeneously dispersed in the mill, wherein the nano-calcium carbonate was purchased from Changzhou Calcium Carbonate Co., Ltd.) for coating treatment; the dosage of nano-calcium carbonate emulsion was 700ml / kg fly ash, the spraying ...

Embodiment 2

[0021] In the fluidized bed, the fly ash that has been screened to remove iron beads, carbon particles, and ultrafine grinding (grinding fineness: 32 μm sieve residue ≤ 8%) is activated with saturated lime water; the activated fly ash is mixed with The oxidized polyethylene emulsion of atomized nano-calcium carbonate (the oxidized polyethylene emulsion of nano-calcium carbonate is to mix and stir nano-calcium carbonate with oxidized polyethylene emulsion in a ratio of 35% by weight, and then homogeneously disperse in a colloid mill to obtain , wherein nano-calcium carbonate was purchased from Changzhou Calcium Carbonate Co., Ltd.) for coating treatment; the dosage of nano-calcium carbonate emulsion was 500ml / kg fly ash, the spraying time was 5min, and the reaction temperature was 110°C. Boiling and granulating for 50 minutes, discharging. Then, stearic acid accounting for 0.5% of the weight of fly ash was dissolved in absolute ethanol to make a saturated solution, and reacted ...

Embodiment 3

[0023] In the fluidized bed, the fly ash that has been screened to remove iron beads, carbon particles, and ultrafine grinding (grinding fineness: 32 μm sieve residue ≤ 8%) is activated with saturated lime water; the activated fly ash is mixed with The oxidized polyethylene emulsion of atomized nano-calcium carbonate (the oxidized polyethylene emulsion of nano-calcium carbonate is to mix and stir nano-calcium carbonate with oxidized polyethylene emulsion in a ratio of 40% by weight, and then homogeneously disperse in a colloid mill to make , wherein nano-calcium carbonate was purchased from Changzhou Calcium Carbonate Co., Ltd.) for coating treatment; the dosage of nano-calcium carbonate emulsion was 900ml / kg fly ash, the spraying time was 10min, and the reaction temperature was 110°C. Boiling and granulating for 70 minutes, discharging. Then, stearic acid accounting for 1.2% of the weight of the fly ash was dissolved in absolute ethanol to make a saturated solution, and react...

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Abstract

The invention discloses a method for preparing nano calcium carbonate coated fly ash ultrafine powder, which comprises: crushing fly ash serving as a raw material into ultrafine powder, activating the ultrafine powder, coating the ultrafine powder by using nano calcium carbonate, performing chemical modification and coupling treatment, and obtaining the nano calcium carbonate coated fly ash ultrafine powder product which can be filled into rubber and plastic products in place of light calcium carbonate. The indexes of the nano calcium carbonate coated fly ash ultrafine powder, including reinforcing performance, aging resistance, corrosion resistance and compatibility with polymer substrate are higher than those of light calcium carbonate. When used to be filled in rubber and plastic products in place of light calcium carbonate, the nano calcium carbonate coated fly ash ultrafine powder meets the technical requirements of rubber plastic filler; and the filled amount of the nano calcium carbonate coated fly ash ultrafine powder is high, the filling effect is good, the preparation method is simple and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of chemical fillers, in particular to a preparation method of modified fly ash. Background technique [0002] Fly ash is a solid waste formed from fine dust produced by coal-fired power plants. The quantity is large, and improper disposal will cause pollution. The harmful substances in it will also cause harm to human body and organisms, and it will also occupy a large amount of land. The chemical composition of fly ash is SiO 2 、Al 2 o 3 Mainly, due to its physical activity and chemical activity (potential pozzolanic activity), it can be exploited and utilized as a resource. As a resource, fly ash has high use value and is indispensable for some building materials and products. my country's coal resources are very rich, and coal-fired power generation will be the main energy source in my country for a long time, and the output of fly ash will continue to increase significantly. Therefore, vigorously ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/40C09C3/04C09C3/06C09C3/10C09C3/12C09C3/08
Inventor 高峰
Owner HUAINAN LANCAI ENVIRONMENTAL PROTECTION TECH
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