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Process for preparing nano calcium hydroxide

A calcium hydroxide and nanotechnology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of particle collision, alkali reduction of yield, agglomeration, etc., achieve good environmental friendliness performance, improve stability and Dispersion effect

Inactive Publication Date: 2006-07-12
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the addition of alkali solution can also easily cause local overconcentration of the alkali and reduce the yield. The use of ultrasonic waves can effectively reduce powder agglomeration, but during the dispersion process, with the increase of thermal energy and mechanical energy, the probability of particle collision also increases. It will lead to further agglomeration and waste of energy, so the ultrasonic stirring method should be screened so that it can effectively break up the agglomerates, fully mix the materials, and reduce energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In 25ml of 0.2mol calcium chloride solution, add 0.04g of PVA124 which is 8% of the solution mass, ultrasonically oscillate for 1h, at room temperature, drop 50ml of 0.2mol sodium hydroxide at a rate of 20ml / h, and the dropwise addition is completed Then ultrasonically oscillate for half an hour. The resultant was centrifuged and precipitated at 7000r / min, and the precipitate was washed and centrifuged with distilled water. After repeating 4 times, the precipitate was tested for chlorine ions with silver nitrate, and vacuum-dried at 320K for 24 hours to obtain white powder nano calcium hydroxide. .

Embodiment 2

[0024] In 25ml of 0.1mol calcium chloride solution, add 0.08g of PEG6000 which is 16% of the solution mass, ultrasonically oscillate for 1h, at room temperature, drop 0.1mol of ammonia water 50ml at a rate of 30ml / h, after the addition is completed, ultrasonically Shake for half an hour. The resultant was centrifuged and precipitated at 7000r / min. The precipitate was washed with distilled water and centrifuged. After repeating 7 times, the precipitate was detected by silver nitrate. After the detection of chlorine ions in the precipitate, it was vacuum-dried at 320K for 24 hours to obtain a white powder nano-hydroxide calcium.

Embodiment 3

[0025] Embodiment 3: in the calcium chloride solution of 25ml 0.2mol, add 0.12g namely the 24% PAA-NH of solution quality 4, ultrasonically oscillate for 1 hour, drop 50ml of 0.2mol potassium hydroxide at room temperature at a rate of 25ml / h, ultrasonically oscillate for half an hour after the addition is completed, and centrifuge the product at 7000r / min, wash the precipitate with distilled water, and centrifuge , after repeating 4 times, after no chlorine ion was detected in the precipitate with silver nitrate, vacuum drying at 320K for 24 hours to obtain a white powder product nano-calcium hydroxide.

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Abstract

The invention discloses a making method of nanometer calcium hydroxide, which comprises the following steps: adding water-soluble, macromolecular polymer PVA124, PEG6000, PAA-NH4, PVP, PVA124 on the main chain or branched chain with polarity oxygen-containing group or natural macromolecular crust amine as mould; shocking the mould for 1h through ultraviolet wave to mix completely; preparing nanometer calcium hydroxide with macromolecular coating layer in the NaOH, KOH or ammonia alkaline solution through cleaning, centrifuging and drying. The invention improves the stability and dispersibility of nanometer calcium hydroxide to realize the controllable synthesis, which can be used as antichlor, desulfurizer and high effective adjuvant.

Description

technical field [0001] The invention relates to a method for preparing nanometer calcium hydroxide, in particular to a method for preparing nanometer calcium hydroxide by using an in-situ modification method. Background technique: [0002] Calcium hydroxide is a medium-strong alkali, slightly soluble in water, easy to absorb moisture, and easy to react with carbon dioxide in the air. It is a common chemical raw material and is widely used in plastics, rubber, cement and other fields. Its environmental friendliness is positive It has gradually become a research hotspot and has a good application prospect. For example, it can be used as a dechlorination agent and desulfurization agent for solid waste incineration, a neutralizing agent for soil acidification, a stabilizer for soil heavy metals, a high-efficiency additive that can accommodate plastics in the environment, and a flame retardant for plastics. [0003] The preparation method of ordinary calcium hydroxide is relativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/02
Inventor 陈庆华许兢钱庆荣肖荔人
Owner FUJIAN NORMAL UNIV
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