CN114436232A - Method for preparing hydroxyapatite by using waste incineration ash - Google Patents
Method for preparing hydroxyapatite by using waste incineration ash Download PDFInfo
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- CN114436232A CN114436232A CN202210134509.XA CN202210134509A CN114436232A CN 114436232 A CN114436232 A CN 114436232A CN 202210134509 A CN202210134509 A CN 202210134509A CN 114436232 A CN114436232 A CN 114436232A
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- incineration ash
- hydroxyapatite
- waste incineration
- phosphate solution
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/32—Phosphates of magnesium, calcium, strontium, or barium
- C01B25/325—Preparation by double decomposition
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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Abstract
The invention discloses a method for preparing hydroxyapatite by using waste incineration ash. (1) The raw materials are divided into refuse incineration ash and phosphate solution. (2) The waste incineration ash is soaked in phosphate solution with the preferable concentration of 2 mol/L. (3) And (3) filtering the mixed solution which is maintained to the preferred age of 21 days in the step (2), and drying the solid to obtain the hydroxyapatite. The method has the advantages of simple operation, low cost, high yield and wide industrial production prospect, and is an important way for realizing the regeneration and utilization of the waste incineration ash.
Description
Technical Field
The invention relates to the field of recycling of household garbage incineration fly ash, in particular to a method for preparing hydroxyapatite by using garbage incineration ash.
Background
The household garbage incineration fly ash is a substance remained in a flue gas dust removal system after household garbage is incinerated, is a byproduct of garbage incineration power generation, accounts for 3-5% of the garbage incineration amount, accounts for about 10-20% of the total amount of the garbage incineration ash, and comprises flue ash, limestone powder added for removing acidic gas and a product CaCl after reaction2,CaSO4And the like. Generally, the fly ash from incineration of household garbage contains a large amount of heavy metal elements with high toxicity, and can cause serious damage to a plurality of organs of a human body. If the waste incineration ash is not properly disposed, serious toxicity can be caused to the environment. The fly ash in large and medium-sized cities in China is large in production amount and is short in land resources, and the disposal mode mainly based on landfill is under increasing pressure. At present, how to efficiently treat and utilize the waste incineration ash has become an important subject of the related research direction.
At present, the utilization and disposal of the waste incineration ash are divided into two modes of landfill and resource utilization. Landfill is a traditional method for treating fly ash, resource is a new treatment mode developed in recent years, research is less, and a novel idea is lacked. Research shows that the waste incineration ash is a calcium-rich material, and the main components of the waste incineration ash are CaO, MgO and SiO2、Fe2O3And Al2O3Oxide of heavy metal, belonging to SiO2-Al2O3A metal oxide system, and the annual output of the waste incineration ash is considerable, thereby having great potential of resource utilization.Therefore, the invention provides a method for utilizing waste incineration ash with high added value, namely, hydroxyapatite is prepared from the waste incineration ash. Hydroxyapatite (Ca)10(PO4)6(OH)2HAP) is the main inorganic component of human skeleton and tooth, has better biocompatibility, chemical stability, adhesion, and higher specific surface area, strength and rigidity, and is a bionic material commonly used for drug delivery and skeleton repair. Therefore, the method for preparing the hydroxyapatite by using the waste incineration ash not only can realize the recycling of the domestic waste treatment waste, but also can prepare the hydroxyapatite which is a multifunctional material with high added value, thereby having important social significance and application value.
Disclosure of Invention
The invention aims to provide a method for preparing hydroxyapatite by using waste incineration ash. The method is simple to operate, takes the household garbage disposal waste-garbage incineration ash as a calcium source, prepares a multifunctional bionic material-hydroxyapatite, solves the problem that the garbage incineration ash cannot be effectively utilized, realizes the purpose of efficiently utilizing the garbage incineration ash, and has very wide application prospect.
The method for preparing hydroxyapatite by using waste incineration ash is characterized in that the waste incineration ash is used as a calcium source and reacts with phosphate to prepare hydroxyapatite with high specific surface area and high adsorption capacity. The method comprises the following steps:
(1) the raw material consists of a solid component and a liquid component. The solid component is dry garbage incineration ash which is taken from household garbage disposal waste; the liquid component is a phosphate solution.
(2) Adding certain mass of waste incineration ash into phosphate solution with certain concentration, and maintaining at a certain temperature for a certain age.
(3) And (3) filtering the mixed solution which is maintained to a certain age in the step (2) and contains the garbage incineration ash and the phosphate solution, and drying the solid in an environment at 105 ℃ for 24 hours to obtain the hydroxyapatite.
The used garbageThe method for preparing hydroxyapatite by burning ash is characterized in that the phosphate solution in the step (1) is (NH)4)2HPO4,Na2HPO4,K2HPO4And the phosphate solution or the mixed solution of a plurality of phosphates is obtained.
The method for preparing hydroxyapatite by using the waste incineration ash is characterized in that the concentration of the phosphate solution in the step (2) is preferably 2mol/L, and the molar ratio of calcium element (Ca) in the waste incineration ash to phosphorus element (P) in the phosphate solution is preferably 1.67(Ca/P is 1.67).
The method for preparing hydroxyapatite by using waste incineration ash is characterized in that the preferable temperature condition in the step (2) is 50 ℃, and the preferable age is 21 days.
The method for preparing hydroxyapatite by using waste incineration ash is characterized in that nano-scale hydroxyapatite crystals are grown on the surfaces of the solid particles obtained in the step (3).
The hydroxyapatite crystal prepared by the invention grows on the surface of the waste incineration ash, has a nano-scale three-dimensional reticular or spherical structure, higher specific surface area and adsorption capacity and stable chemical property. The method has the advantages of simple preparation process, low cost and energy consumption, clear flow and suitability for industrial production, and the prepared hydroxyapatite can be widely applied to aspects of building humidity regulation, heavy metal adsorption, water pollution treatment and the like.
Advantageous effects
Compared with the prior art, the invention has the beneficial effects that: realizes the high value-added utilization of the waste incineration ash, prepares a multifunctional material-hydroxyapatite, reduces the pollution of air, water and soil caused by the disposal of the waste incineration ash, and recycles resources.
The method has the advantages of simple operation, low cost, high yield and wide industrial production prospect, and is an important way for realizing the recycling of calcium-containing wastes such as waste incineration ash and the like.
Drawings
FIG. 1 shows the elemental components of the incineration ash of refuse according to examples 1 and 2 of the present invention.
FIG. 2 is a scanning electron microscope image of a refuse incineration ash raw material in example 1 of the present invention.
Fig. 3 is a scanning electron microscope image of hydroxyapatite crystals prepared in example 1 of the present invention.
Fig. 4 is an energy spectrum of hydroxyapatite crystals prepared in example 1 of the present invention.
Fig. 5 is an X-ray diffraction pattern of hydroxyapatite crystals prepared in example 1 of the present invention.
Fig. 6 is a scanning electron microscope image of hydroxyapatite crystals prepared in example 2 of the present invention.
Detailed Description
In order to make the present invention more comprehensible and to make technical solutions and advantages thereof more apparent, the present invention is described in further detail below with reference to embodiments and accompanying drawings. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The specific experimental methods not mentioned in the following examples are generally carried out according to conventional experimental methods.
Example 1
Taking dry waste incineration ash, sieving to particle size of less than 0.63mm, testing the elemental composition of waste incineration ash with X-ray fluorescence spectrometer (as shown in figure 1), and preparing 100ml (NH) with concentration of 2mol/L4)2HPO4And (3) solution. 40g of refuse incineration ash was weighed out and placed in (NH)4)2HPO4In the solution, sealed with a plastic bag and left at 23 + -1 deg.C for 9 days. Thereafter, the solid was filtered and dried at 105 ℃ for 24 hours to obtain hydroxyapatite.
Example 2
Taking dry waste incineration ash, sieving to obtain particle diameter larger than 1.25mm, testing the elemental composition of the waste incineration ash by using X-ray fluorescence spectrometer as shown in figure 1, and preparing 100ml (NH) with concentration of 2mol/L4)2HPO4And (3) solution. According to the Ca/P molar ratio of 1.67, the waste incineration ash is put into (NH)4)2HPO4In the solution, the mixture was sealed with a plastic bag and left at 50 ℃ for 15 days. Then, the solid is filtered out and dried for 24 hours at 105 ℃, thus obtaining the hydroxyapatiteAnd (4) stone.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A method for preparing hydroxyapatite by using waste incineration ash is characterized in that the waste incineration ash is used as a calcium source to prepare the hydroxyapatite.
2. A method for preparing hydroxyapatite using refuse incineration ash according to claim 1, characterized by comprising the steps of:
(1) the raw material consists of a solid component and a liquid component. The solid component is dry garbage incineration ash which is taken from household garbage; the liquid component is a phosphate solution.
(2) Adding certain mass of waste incineration ash into phosphate solution with certain concentration, and maintaining at a certain temperature for a certain age.
(3) And (3) filtering the mixed solution which is maintained to a certain age in the step (2) and contains the garbage incineration ash and the phosphate solution, and drying the solid in an environment at 105 ℃ for 24 hours to obtain the hydroxyapatite.
3. The method for preparing hydroxyapatite using incineration ash of garbage according to claim 2, wherein the phosphate solution in the step (1) is (NH)4)2HPO4,Na2HPO4,K2HPO4And the phosphate solution or the mixed solution of a plurality of phosphates is obtained.
4. The method for preparing hydroxyapatite using waste incineration ash according to claim 2, characterized in that the phosphate solution of the step (2) has a concentration of 2mol/L, and the preferred molar ratio of calcium element (Ca) in the waste incineration ash to phosphorus element (P) in the phosphate solution is 1.67(Ca/P ═ 1.67).
5. The method for preparing hydroxyapatite using waste incineration ash according to claim 2, wherein the preferred temperature condition of the step (2) is 50 ℃, and the preferred age is 21 days.
6. The method for preparing hydroxyapatite using incineration ash of refuse according to claim 2, wherein the solid particles obtained in the step (3) have nano-sized hydroxyapatite crystals grown on the surface thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210134509.XA CN114436232A (en) | 2022-02-14 | 2022-02-14 | Method for preparing hydroxyapatite by using waste incineration ash |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210134509.XA CN114436232A (en) | 2022-02-14 | 2022-02-14 | Method for preparing hydroxyapatite by using waste incineration ash |
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| CN114436232A true CN114436232A (en) | 2022-05-06 |
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| CN202210134509.XA Withdrawn CN114436232A (en) | 2022-02-14 | 2022-02-14 | Method for preparing hydroxyapatite by using waste incineration ash |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106882779A (en) * | 2017-03-23 | 2017-06-23 | 武汉纺织大学 | A kind of method that phosphorus is reclaimed from city garbage burning flying ash |
| CN107934932A (en) * | 2017-12-19 | 2018-04-20 | 安徽理工大学 | A kind of method for preparing hydroxyapatite using discarded powder of lacquer putty for use on |
| CN113896180A (en) * | 2021-11-23 | 2022-01-07 | 深圳基荣新能源科技有限公司 | Hydroxyapatite and preparation method thereof |
-
2022
- 2022-02-14 CN CN202210134509.XA patent/CN114436232A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106882779A (en) * | 2017-03-23 | 2017-06-23 | 武汉纺织大学 | A kind of method that phosphorus is reclaimed from city garbage burning flying ash |
| CN107934932A (en) * | 2017-12-19 | 2018-04-20 | 安徽理工大学 | A kind of method for preparing hydroxyapatite using discarded powder of lacquer putty for use on |
| CN113896180A (en) * | 2021-11-23 | 2022-01-07 | 深圳基荣新能源科技有限公司 | Hydroxyapatite and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 胡雨燕;陈德珍;: "水热条件下磷酸盐稳定垃圾焚烧飞灰的研究", 建筑材料学报, no. 01, pages 121 - 126 * |
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