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Composite powder material of fly ash hollow microspheres with surfaces cladded with nanometer magnesium hydroxide and preparation method thereof

A technology of nano-magnesium hydroxide and hollow microspheres, which is applied in chemical instruments and methods, water treatment of special compounds, water/sewage treatment, etc., can solve the problems of high cost and difficult filtration of water treatment agents, and achieve the goal of solving difficult filtration Effect

Inactive Publication Date: 2017-12-08
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a nano-magnesium hydroxide composite powder material coated on the surface of fly ash hollow microspheres and its preparation method. According to the idea of ​​"particle design", it is conceived to coat Nano-magnesium hydroxide particles can not only solve the problems when fly ash hollow microspheres and nano-magnesium hydroxide are used as fillers, but can also be used in the field of sewage treatment to solve the problems of difficult filtration and high cost of nano-magnesium hydroxide water treatment agents

Method used

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  • Composite powder material of fly ash hollow microspheres with surfaces cladded with nanometer magnesium hydroxide and preparation method thereof
  • Composite powder material of fly ash hollow microspheres with surfaces cladded with nanometer magnesium hydroxide and preparation method thereof
  • Composite powder material of fly ash hollow microspheres with surfaces cladded with nanometer magnesium hydroxide and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Weigh 4.35g of the calcined sample of fly ash hollow microspheres, the solid-to-liquid ratio is 1:3, heat to 80°C, stir for 20min, and add dropwise a sodium hydroxide solution with a concentration of 0.25mol / l and a dropping rate of 7ml / min 500ml; concentration is 0.15mol / l, and the magnesium sulfate solution 417ml that dripping speed is 5ml / min, adjusts pH to be 12 after dropwise addition is completed, continues to react for 120min, after aging 30min, filter, wash, dry, break up and depolymerize, Measure whiteness.

Embodiment 2

[0027] Weigh 4.35g of the calcined sample of fly ash hollow microspheres, the solid-to-liquid ratio is 1:10, heat to 25°C, stir for 30min, and add dropwise a sodium hydroxide solution with a concentration of 0.25mol / l and a dropping rate of 2ml / min 500ml, the concentration is 0.15mol / l, and the rate of addition is 2ml / min magnesium sulfate solution 417ml. After the dropwise addition, adjust the pH to 7, continue to react for 30 minutes, then age for 60 minutes, filter, rinse, dry, break up and depolymerize, and measure the whiteness.

Embodiment 3

[0029] Weigh 5.8g of the calcined sample of fly ash hollow microspheres, the solid-to-liquid ratio is 1:5, heat to 90°C, stir for 20min, and add dropwise a sodium hydroxide solution with a concentration of 0.25mol / l and a dropping rate of 5ml / min 466.7ml and 455.5ml of magnesium sulfate solution with a concentration of 0.15mol / min and a dropping rate of 5ml / min, adjust the pH to 10 after the addition is completed, continue to react for 90min, then age for 30min, filter, rinse, dry, break up and dissolve Gather, measure whiteness.

[0030] Table 1 Whiteness test and analysis results of example samples and raw materials

[0031]

[0032] figure 1 It is the SEM picture of the nano-magnesium hydroxide composite powder coated on the surface of the fly ash hollow microspheres prepared in Example 1 of the present invention. In the figure: a. Fly ash hollow microspheres coated with magnesium hydroxide × 10,000 times; b. Fly ash hollow microspheres coated with magnesium hydroxide ...

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Abstract

The invention discloses a composite powder material of fly ash hollow microspheres with surfaces cladded with nanometer magnesium hydroxide and a preparation method thereof. A calcined sample of fly ash hollow microspheres is adopted as a raw material, sodium hydroxide and magnesium sulfate are adopted as a cladding agent, and the composite powder material is prepared by adopting a heterogeneous nucleation method. The preparation method specifically comprises the following steps: (1) calcinating the fly ash hollow microspheres; (2) adding water into the calcined fly ash hollow microspheres for stirring dispersion, and performing water-bath heating to obtain suspension liquid; (3) adding a solution of the sodium hydroxide and the magnesium sulfate into the suspension liquid, and performing precipitation reaction to clad the surfaces of the fly ash hollow microspheres with magnesium hydroxide; (4) after addition of the solution of the sodium hydroxide and the magnesium sulfate is finished, regulating the pH with sodium hydroxide, continuing reaction, and performing heat preservation and aging; (5) performing filtering, washing, drying and depolymerization on a reaction product to obtain the composite powder material. According to the composite powder material, the problems of low whiteness, poor compatibility, high abrasion and poor flame retardancy of a hollow microsphere filled polymer and the difficulty in dispersion of a nanometer magnesium hydroxide filled polymer are solved.

Description

technical field [0001] The invention relates to a nano-magnesium hydroxide composite powder material coated on the surface of fly ash hollow microspheres and a preparation method thereof, belonging to the fields of mineral material processing and environmental treatment. Background technique [0002] The storage and treatment of fly ash has become a worldwide problem, and it is often used in the production of building materials, road construction, photocatalysis, agriculture, sewage treatment and other fields. In recent years, researchers have used ultrafine fly ash as a filler in plastics, and partially realized the high value-added utilization of fly ash. In the paper "The Effect of Fly Ash on the Properties of Polyurethane Rigid Foam" published by Du et al. (New Building Materials, 2014, 4:15-17), the fly ash is filled in the polyurethane rigid foam, and the fly ash is considered to be The main component has a certain flame retardancy and can work synergistically with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K7/26C02F1/00
CPCC08K9/10C02F1/00C02F2305/08C08K7/26
Inventor 王彩丽王怀法杨润全王静
Owner TAIYUAN UNIV OF TECH
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