Method for preparing nano magnesium whitlockite powder

A technology of magnesium white calcium phosphate and mineral powder, which is applied in the fields of chemical and biological materials, can solve the problems of rare crystal grain size and uniformity of magnesium white phosphate calcium ore, and achieves the effect of simple method and loose preparation conditions.

Inactive Publication Date: 2010-06-16
CHONGQING UNIV
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Problems solved by technology

However, there are few reports on the use of surfactants to control the grain size and uniformity of magnesite

Method used

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  • Method for preparing nano magnesium whitlockite powder
  • Method for preparing nano magnesium whitlockite powder
  • Method for preparing nano magnesium whitlockite powder

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preparation example Construction

[0027] The preparation method of the nano-magnesium calcium white phosphorous ore powder of the present invention, its preparation steps are:

[0028] (1) Ca(NO 3 ) 2 4H 2 O, Mg(NO 3 ) 2 ·6H 2 O, Na 2 EDTA·2H 2 O and Na 2 HPO 4 12H 2 O for material preparation;

[0029] (2) Na 2 EDTA·2H 2 O, Ca(NO 3 ) 2 4H 2 O and Mg(NO 3 ) 2 ·6H 2 Dissolve O together in water to obtain 1# solution, adjust the pH value and concentration to finally make the pH value of 1# solution 7, and the concentration is 4~5mol.L -1 ;

[0030] (3) Na 2 HPO 4 12H 2 O is dissolved in water to form a solution, and the pH value is adjusted to be consistent with the 1# solution to obtain the 2# solution, and the volume of the 2# solution is the same as the 1# solution volume;

[0031] (4) Slowly add the 2# solution to the 1# solution, and stir while adding. The purpose of slowly adding and stirring is to fully react the 2# solution and the 1# solution to obtain the 3# solution;

[0032] (...

Embodiment 1

[0043] Weigh 18.6 g Na 2 EDTA·2H 2 O powder, 112.2 grams of Ca(NO 3 ) 2 4H 2 O and 6.4 g Mg(NO 3 ) 2 ·6H 2 O powder, dissolve into 40 milliliters of deionized water successively and fully stir to dissolve, use 50 milliliter volumetric flasks to constant volume, prepare and obtain 1# solution; Weigh 107.4 grams of Na 2 HPO 4 12H 2 O was dissolved in 40 milliliters of deionized water and stirred until completely dissolved to prepare 2# solution; the 1# and 2# solutions were adjusted to pH=7 with the 5M NaOH solution prepared in advance, and 2# was mixed under the condition of vigorous stirring. # solution was added dropwise to 1# solution, and 100 ml of mixed solution was obtained after the addition was completed; adjust the pH value of the solution to 7, then magnetically stirred the 100 ml mixed solution at a constant temperature of 60°C for 2 hours, and then put the mixed solution in polytetrafluoroethylene In the ethylene reaction kettle, make it carry out the hydro...

Embodiment 2

[0045] Weigh 18.6 g Na 2 EDTA·2H 2 O powder, 106.2 grams of Ca(NO3) 2 4H 2 O and 12.8 g Mg(NO 3 ) 2 ·6H 2 O powder, dissolve into 40 milliliters of deionized water successively and fully stir to dissolve, use 50 milliliter volumetric flasks to constant volume, prepare and obtain 1# solution; Weigh 107.4 grams of Na 2 HPO 4 12H 2 O was dissolved in 40 milliliters of deionized water and stirred until completely dissolved to prepare 2# solution; the 1# and 2# solutions were adjusted to pH=7 with the 5M NaOH solution prepared in advance, and 2# was mixed under the condition of vigorous stirring. # solution was added dropwise to 1# solution, and after the dropwise addition was completed, 100 ml of mixed solution was obtained, and the pH of the mixed solution was adjusted to 7 with 5M NaOH solution; then 100 ml of mixed solution was magnetically stirred at a constant temperature of 60°C for 2 hours, and then mixed Put the liquid into a polytetrafluoroethylene reactor, and ma...

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Abstract

The invention relates to a method for preparing nano magnesium whitlockite powder by taking Ca(NO3)2.4H2O, Mg(NO3)2.6H2O, Na2HPO4.12H2O and Na2EDTA.2H2O as raw materials, comprising the following steps: mixing Mg(NO3)2.6H2O and hydrophosphate agueous solution; heating the Mg(NO3)2.6H2O and the hydrophosphate agueous solution in a sealed container at specific temperature to make the Mg(NO3)2.6H2O and the hydrophosphate agueous solution react for a certain time; and filtering and drying the product of reaction to obtain the nano magnesium whitlockite powder. The invention mainly has the two advantages that the method for preparing the nano magnesium whitlockite powder is simple, economical and controllable, and the pure nano magnesium whitlockite powder with the very uniform particle size of less than 100 nm and the purity of more than 95 percent can be prepared under the non-strict condition in the large Ca / Mg ratio and temperature range by using Na2EDTA which can be simply recycled for secondary use to control the hydro-thermal reaction condition.

Description

technical field [0001] The invention relates to a preparation method of nano-magnesia white calcium calcium ore powder, which belongs to the field of chemistry and biological materials. Background technique [0002] Magnesium white phosphorus calcium mineral (Whitlockite), its chemical formula is Ca 18 Mg 2 h 2 (PO 4 ) 14 , is a precursor material for the preparation of magnesium-doped hydroxyapatite (HA) ceramics, and is also an important biomineral, which mainly exists in calcification and dentin caries of humans and animals, especially in pathological deposits. The research on the crystal structure and formation mechanism of magnesia white phosphocalcite is of great significance for understanding the metabolism and biomineralization mechanism of magnesium in the human body. In addition, magnesium-doped hydroxyapatite bioactive ceramics have great application prospects in medicine as hard tissue repair and replacement materials. [0003] At present, the research on m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45
Inventor 辛仁龙左蔼龄张敏丁永会高家诚
Owner CHONGQING UNIV
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