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A method for surface precipitation and crystallization type coating modification of fly ash used as papermaking filler

A technology of precipitation crystallization and paper-making filler, which is applied in the direction of adding inorganic compounds, can solve the problems of application limitations, difficulty in meeting high-whiteness paper filling, etc., and achieve the effects of convenient acquisition, low cost, and reduced energy consumption

Active Publication Date: 2018-03-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the interference of unburned carbon, iron oxide and other color sources in fly ash particles, the whiteness is only about 30% ISO, which is difficult to meet the requirements of high whiteness paper filling (≧80% ISO). Applications in the field are therefore limited

Method used

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  • A method for surface precipitation and crystallization type coating modification of fly ash used as papermaking filler
  • A method for surface precipitation and crystallization type coating modification of fly ash used as papermaking filler
  • A method for surface precipitation and crystallization type coating modification of fly ash used as papermaking filler

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Experimental program
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Effect test

Embodiment 1

[0030] at 25 o C condition according to M 粉煤灰 :M 氢氧化钙（溶质） =1.0 mass ratio equipped with fly ash (average particle size 40μm) and Ca(OH) 2 Mix the suspension, and adjust the mass concentration of fly ash in the mixture to 30%. Then, CO was introduced at a flow rate of 0.4 L / min at a stirring rate of 400 rpm. 2 Gas, after 50min, stop feeding CO 2 Gas and agitation terminate the reaction, take a sample to measure the whiteness of 73%ISO, dilute it with water to a concentration of 1% by mass, and then use it for papermaking and filling.

Embodiment 2

[0032] at 25 o C condition according to M 粉煤灰 :M 氢氧化钙（溶质） =1.6 mass ratio equipped with fly ash (average particle size around 40μm) and Ca(OH) 2 Mix the suspension, and adjust the mass concentration of fly ash in the mixture to 40%. Then, CO was introduced at a flow rate of 0.1 L / min at a stirring rate of 400 rpm. 2 Gas, after 30min, stop feeding CO 2 Gas and agitation terminate the reaction, take a sample to measure the whiteness of 78% ISO, and dilute it with water to a concentration of 5% by mass for papermaking and filling.

Embodiment 3

[0034] at 25 o C condition according to M 粉煤灰 :M 氢氧化钙（溶质） =0.185 mass ratio equipped with fly ash (average particle size around 40μm) and Ca(OH) 2 Mix the suspension, and adjust the mass concentration of fly ash in the mixture to 25%. Then, CO was introduced at a flow rate of 0.1 L / min at a stirring rate of 300 rpm. 2 Gas, after 30min, stop feeding CO 2 Gas and agitation terminate the reaction, and the whiteness is measured as 86%ISO by sampling. It is diluted with water to a concentration of 10% by mass and then used for filling in papermaking.

[0035] Such as figure 2 Shown is the SEM morphology of fly ash particles before surface modification, image 3 It is the SEM morphology of fly ash particles after surface modification. It can be clearly seen that a large number of calcium carbonate crystals with a particle size much smaller than the original coal ash particles are fixed on the surface of the fly ash particles, and they are evenly arranged, playing a certain co...

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Abstract

A method using crystal deposition coating for modifying surface of fly ash for manufacturing a paper filler. The method comprises: after vibration screening to select fly ash with particle diameter of 30-55 μm, evenly mixing the fly ash with a Ca(OH)2 solution under room temperature; bubbling CO2 gas from the bottom of a reaction vessel under a stirring condition to realize modification via crystal deposition coating.

Description

technical field [0001] The invention belongs to the technical field of filler modification in the discipline of pulping and papermaking engineering, and in particular relates to a method for surface precipitation and crystallization coating modification of fly ash used as papermaking filler. Background technique [0002] As a by-product of coal combustion in power plant boilers, fly ash is one of the largest sources of urban solid waste emissions in my country. The stacking of fly ash will directly or indirectly cause a series of environmental problems such as air, soil, and rivers, and at the same time cause a great waste of resources. Over the years, scholars at home and abroad have studied the resource utilization technology of fly ash through various methods, and have made breakthroughs in construction, roads, sewage treatment, mineral extraction, and material filling. However, there are a series of problems in the utilization of these fields, such as low product yield,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/69D21H17/67
CPCD21H17/67D21H17/69
Inventor 樊慧明齐亚楠刘建安李哲
Owner SOUTH CHINA UNIV OF TECH
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