CN108191383B - Method for manufacturing magnesium phosphate building block - Google Patents
Method for manufacturing magnesium phosphate building block Download PDFInfo
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- CN108191383B CN108191383B CN201711365979.2A CN201711365979A CN108191383B CN 108191383 B CN108191383 B CN 108191383B CN 201711365979 A CN201711365979 A CN 201711365979A CN 108191383 B CN108191383 B CN 108191383B
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- magnesium phosphate
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- foaming agent
- magnesium
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses a method for manufacturing a magnesium phosphate building block. The manufacturing method of the magnesium phosphate building block comprises the following steps: 1) preparing a magnesium phosphate cementing material; 2) preparing magnesium phosphate slurry; 3) preparing magnesium phosphate foam slurry; 4) and (4) injection molding. The invention provides the application of the environment-friendly magnesium phosphate cementing material in the manufacture of building blocks, which can not only meet the requirements of the cementing material, but also achieve the purpose of recycling solid waste resources. The magnesium phosphate building block disclosed by the invention is simple in manufacturing method, low in cost, high in energy-saving efficiency and good in application prospect.
Description
Technical Field
The invention relates to a method for manufacturing a magnesium phosphate building block.
Background
In the existing urban and rural buildings of 400 hundred million square meters in China, only 3.2 million square meters of urban houses can be called as energy-saving buildings. Among more than 20 hundred million square meters of buildings finished every year in China, only less than 1 hundred million square meters of buildings belong to energy-saving buildings, and account for about 3 percent. The energy consumption of heating or refrigerating per square meter of buildings in China is about 3 times that of the developed countries. The energy consumption for national buildings accounts for 27.5 percent of the total energy consumption in China. At present, China is building high-energy-consumption buildings in unprecedented scale.
Nowadays, the social demand is continuously increased and the consumption level is increasingly improved, and the energy shortage becomes a major subject restricting the continuous and coordinated development of the economy and the society in China. Energy conservation and energy consumption reduction, particularly the reduction of building energy consumption, are a difficult task which is indescribable in the front of wall material workers. Under the background, the developed building energy-saving heat-insulating building block has very wide application prospect.
The quantity of demolition construction waste in China is about 1 hundred million tons every year, 34% of the demolition construction waste is waste concrete, 3400 ten thousand tons of the waste concrete is generated, and in addition, 4000 ten thousand tons of the waste concrete is generated by newly built houses, so that how to utilize the waste concrete becomes a research hotspot. In the past, most of the research on waste concrete has focused on the research on the preparation of recycled aggregate from waste concrete aggregate, and the research on the utilization of powder in waste concrete has been rarely reported. Magnesium phosphate cements were first discovered by Prosen in 1939 and used in the foundry industry, also known as chemically bonded phosphate cements. Is generally prepared by reacting reburning MgO, phosphate and retarder according to a certain proportion. The fiber has the advantages of early strength generation, high strength, good cohesiveness, good durability, good volume stability, strong environmental temperature suitability, low pH value, good compatibility with fiber, good biocompatibility and the like, and is widely researched and applied by Chinese and foreign students.
Disclosure of Invention
The invention aims to provide a method for manufacturing a magnesium phosphate building block.
The technical scheme adopted by the invention is as follows:
a manufacturing method of a magnesium phosphate building block comprises the following steps:
1) preparing a magnesium phosphate cementing material: mixing monopotassium phosphate, magnesium oxide, waste concrete powder and sodium polyphosphate to obtain a magnesium phosphate cementing material;
2) preparing magnesium phosphate slurry: mixing a magnesium phosphate cementing material with water, adding fly ash and asbestos, and uniformly mixing to obtain magnesium phosphate slurry;
3) preparing magnesium phosphate foam slurry: mixing the magnesium phosphate slurry with a foaming agent solution, a foam stabilizer and a water reducing agent, and uniformly stirring to obtain magnesium phosphate foam slurry;
4) injection molding: and injecting the magnesium phosphate foam slurry into a mold, heating and maintaining, and demolding after cooling to obtain the magnesium phosphate building block.
In the step 1), the magnesium phosphate cementing material is composed of the following raw materials in parts by mass: 20-25 parts of monopotassium phosphate, 30-35 parts of magnesium oxide, 35-40 parts of waste concrete powder and 3-6 parts of sodium polyphosphate.
In the step 1), the magnesium oxide is dead burned magnesium oxide, and the mass fraction of MgO is more than or equal to 95%.
In the step 1), the waste concrete powder is obtained by crushing concrete waste for common buildings and then sieving the crushed concrete waste with a 300-mesh sieve.
In the step 2), the mass ratio of the magnesium phosphate cementing material to the fly ash to the asbestos is 100: (25-35): (15-25).
In the step 2), the water content of the magnesium phosphate slurry is 35wr percent to 45 weight percent.
In the step 3), the mass ratio of the magnesium phosphate slurry to the foaming agent solution to the foam stabilizer to the water reducer is 100: (10-15): (0.5-1.5): (0.3 to 1).
In the step 3), the foaming agent solution is prepared by mixing a foaming agent and water, wherein the mass ratio of the foaming agent to the water is 1: (16-22).
The foaming agent is at least one of abietic acid soap foaming agent, metal aluminum powder foaming agent, vegetable protein foaming agent, animal protein foaming agent, resin soap foaming agent, hydrolyzed blood gel foaming agent and petroleum aluminum sulfonate foaming agent; the foam stabilizer is at least one of polyacrylamide, polyvinyl alcohol, xanthan gum, hydroxyethyl cellulose and calcium stearate; the water reducing agent is at least one of lignosulfonate water reducing agents, naphthalene water reducing agents, melamine water reducing agents, sulfamate water reducing agents, fatty acid water reducing agents and polycarboxylic acid water reducing agents.
In the step 4), the heating maintenance specifically comprises the following steps: firstly heating to 70-80 ℃ and curing for 4-5 h, then heating to 200-250 ℃ and curing for 8-10 h.
The invention has the beneficial effects that:
the invention provides the application of the environment-friendly magnesium phosphate cementing material in the manufacture of building blocks, which can not only meet the requirements of the cementing material, but also achieve the purpose of recycling solid waste resources. The magnesium phosphate building block disclosed by the invention is simple in manufacturing method, low in cost, high in energy-saving efficiency and good in application prospect.
Detailed Description
A manufacturing method of a magnesium phosphate building block comprises the following steps:
1) preparing a magnesium phosphate cementing material: mixing monopotassium phosphate, magnesium oxide, waste concrete powder and sodium polyphosphate to obtain a magnesium phosphate cementing material;
2) preparing magnesium phosphate slurry: mixing a magnesium phosphate cementing material with water, adding fly ash and asbestos, and uniformly mixing to obtain magnesium phosphate slurry;
3) preparing magnesium phosphate foam slurry: mixing the magnesium phosphate slurry with a foaming agent solution, a foam stabilizer and a water reducing agent, and uniformly stirring to obtain magnesium phosphate foam slurry;
4) injection molding: and injecting the magnesium phosphate foam slurry into a mold, heating and maintaining, and demolding after cooling to obtain the magnesium phosphate building block.
Preferably, in the step 1), the magnesium phosphate cementing material is composed of the following raw materials in parts by mass: 20-25 parts of monopotassium phosphate, 30-35 parts of magnesium oxide, 35-40 parts of waste concrete powder and 3-6 parts of sodium polyphosphate.
Preferably, in the step 1), the magnesium oxide is dead burned magnesium oxide, and the mass fraction of MgO is more than or equal to 95%.
Preferably, in the step 1), the waste concrete powder is obtained by crushing common concrete waste for construction and then sieving the crushed concrete waste with a 300-mesh sieve.
Preferably, in the step 2), the mass ratio of the magnesium phosphate cementing material to the fly ash to the asbestos is 100: (25-35): (15-25).
Preferably, in the step 2), the fly ash is second-grade F type fly ash.
Preferably, in the step 2), the water content of the magnesium phosphate slurry is 35 wr% to 45 wt%.
Preferably, in the step 3), the mass ratio of the magnesium phosphate slurry to the foaming agent solution to the foam stabilizer to the water reducing agent is 100: (10-15): (0.5-1.5): (0.3 to 1).
Preferably, in the step 3), the foaming agent solution is prepared by mixing a foaming agent and water, and the mass ratio of the foaming agent to the water is 1: (16-22).
The foaming agent is at least one of abietic acid soap foaming agent, metal aluminum powder foaming agent, vegetable protein foaming agent, animal protein foaming agent, resin soap foaming agent, hydrolyzed blood gel foaming agent and petroleum aluminum sulfonate foaming agent; the foam stabilizer is at least one of polyacrylamide, polyvinyl alcohol, xanthan gum, hydroxyethyl cellulose and calcium stearate; the water reducing agent is at least one of lignosulfonate water reducing agents, naphthalene water reducing agents, melamine water reducing agents, sulfamate water reducing agents, fatty acid water reducing agents and polycarboxylic acid water reducing agents.
In the step 4), the heating maintenance specifically comprises the following steps: firstly heating to 70-80 ℃ and curing for 4-5 h, then heating to 200-250 ℃ and curing for 8-10 h.
The present invention will be described in further detail with reference to specific examples.
Example 1:
the preparation method of the magnesium phosphate block of example 1 is as follows:
firstly, preparing the magnesium phosphate cementing material
Adding 22.9 parts by mass of monopotassium phosphate, 32.7 parts by mass of dead burned magnesium oxide, 39.8 parts by mass of waste concrete powder and 4.6 parts by mass of sodium polyphosphate into a stirrer, stirring for 15-20 minutes, and controlling the stirring speed at 20-40 r/min to prevent dust from flying during powder stirring, thereby obtaining the magnesium phosphate cementing material.
The raw materials used are specified below:
potassium dihydrogen phosphate (KH)2PO4) Produced by Yongchuang chemical Limited company in Jiangxi province, the purity is more than or equal to 99.5 percent, the mesh number is 300 meshes, the pH value is 4.4-4.7, the water content is less than or equal to 2.5 percent, and the content of water-insoluble substancesLess than or equal to 0.20 percent, less than or equal to 0.20 percent of chloride (Cl), less than or equal to 0.003 percent of iron (Fe), less than or equal to 0.005 percent of arsenic (As) and less than or equal to 0.005 percent of heavy metal (calculated by Pb).
The dead burned magnesium oxide is produced by Huanai magnesium industry Limited company, the grain diameter is 300 meshes, the mass fraction of magnesium oxide (MgO) is more than or equal to 95 percent, the mass fraction of calcium oxide (CaO) is less than or equal to 0.9 percent, the mass fraction of hydrochloric acid insoluble is less than or equal to 0.1 percent, and sulfate (in terms of SO)4 2-Calculated by Cl) is less than or equal to 0.2 percent, the mass fraction of iron (Fe) is less than or equal to 0.05 percent, the mass fraction of manganese (Mn) is less than or equal to 0.003 percent, and chloride (calculated by Cl)-Calculated) mass fraction is less than or equal to 0.07 percent, ignition loss mass fraction is less than or equal to 3.0 percent, and bulk density is less than or equal to 160kg/m3。
The waste concrete powder is powder obtained by grinding common building concrete waste for 90min by a ball mill, taking out materials and screening by a 300-mesh standard sieve. The waste concrete powder is gray in appearance. The main components of these fines include a large amount of cement slurry powder, partly cement stone particles and a small amount of limestone fines.
Sodium polyphosphate (Na)5P3O10) Produced by Zhengzhou bannoco chemical products Limited company, the grain size is 300 meshes, the content is more than or equal to 94 percent, and the quality is excellent product, white powder.
Secondly, preparing magnesium phosphate slurry
Adding 100 parts by mass of water into the uniformly mixed magnesium phosphate cementing material, starting a stirrer, controlling the stirring speed to be 20-40 r/min, stirring for 1 minute, and primarily mixing uniformly to prepare slurry. And adding 30 parts by mass of secondary F-type fly ash and 20 parts by mass of asbestos into the primarily uniformly stirred slurry, continuously stirring for 10-15 minutes, and completely and uniformly mixing to obtain magnesium phosphate slurry with the solid concentration of 60%.
Thirdly, preparing magnesium phosphate foam slurry
Diluting a foaming agent by 20 times (the mass ratio of the foaming agent to water is 1:19), adding 30 parts of diluted foaming agent solution into the uniformly mixed magnesium phosphate slurry, simultaneously adding 2 parts of foam stabilizer by mass and 1 part of water reducing agent, continuously stirring for 10 minutes, and uniformly stirring to obtain the magnesium phosphate foam slurry.
The foaming agent is a vegetable protein foaming agent, the foam stabilizer is polyvinyl alcohol, and the water reducing agent is a naphthalene water reducing agent.
Injection molding
A discharge port of a magnesium phosphate foam slurry stirrer is connected to the position near the molds of the building block through a pipeline, a discharge valve is opened, the slurry is conveyed into the molds through the pipeline, and after one mold is poured, the pouring of other molds is continued; and (3) placing the cast mould into a drying room, heating to about 70-80 ℃, curing for 4-5 hours, continuing to heat to about 200-250 ℃, curing for 8-10 hours, and demolding after natural cooling.
Example 2:
in the step of preparing the magnesium phosphate cement of example 2, the magnesium phosphate cement is composed of the following raw materials in parts by mass: 25 parts of monopotassium phosphate, 35 parts of magnesium oxide, 37 parts of waste concrete powder, 3 parts of sodium polyphosphate, and the balance being the same as in example 1.
Example 3:
in the step of preparing the magnesium phosphate cement of example 3, the magnesium phosphate cement is composed of the following raw materials in parts by mass: 20 parts of monopotassium phosphate, 35 parts of magnesium oxide, 40 parts of waste concrete powder, 5 parts of sodium polyphosphate, and the balance being the same as in example 1.
Example 4:
in the step of preparing magnesium phosphate slurry of example 4, 25 parts by mass of fly ash and 25 parts by mass of asbestos were added, and the rest was the same as in example 1.
Example 5:
in the step of preparing magnesium phosphate foam slurry of example 5, 3 parts by mass of a foam stabilizer and 2 parts by mass of a water reducing agent were added, and the rest was the same as in example 1.
The performance test results of the magnesium phosphate building blocks prepared in examples 1 to 5 are shown in table 1.
TABLE 1 magnesium phosphate Block Properties
As can be seen from Table 1, the apparent density of the magnesium phosphate building block prepared by the embodiment is 520-550 kg/m3The heat conductivity coefficient is less than 0.05W/(m.K), and the building block can meet the requirement that the 7-day strength of the existing concrete building block is more than 3 MPa. The building block of the embodiment has very good sound insulation performance through tests, and can meet the requirements of building construction.
Claims (1)
1. A method for manufacturing a magnesium phosphate building block is characterized in that: the method comprises the following steps:
1) preparing a magnesium phosphate cementing material: mixing monopotassium phosphate, magnesium oxide, waste concrete powder and sodium polyphosphate to obtain a magnesium phosphate cementing material;
2) preparing magnesium phosphate slurry: mixing a magnesium phosphate cementing material with water, adding fly ash and asbestos, and uniformly mixing to obtain magnesium phosphate slurry;
3) preparing magnesium phosphate foam slurry: mixing the magnesium phosphate slurry with a foaming agent solution, a foam stabilizer and a water reducing agent, and uniformly stirring to obtain magnesium phosphate foam slurry;
4) injection molding: injecting the magnesium phosphate foam slurry into a mold, heating and maintaining, cooling and demolding to obtain a magnesium phosphate building block;
in the step 1), the magnesium phosphate cementing material is composed of the following raw materials in parts by mass: 20-25 parts of monopotassium phosphate, 30-35 parts of magnesium oxide, 35-40 parts of waste concrete powder and 3-6 parts of sodium polyphosphate; the waste concrete powder is obtained by crushing concrete waste for common buildings and then sieving the crushed concrete waste with a 300-mesh sieve; the magnesium oxide is dead burned magnesium oxide, and the mass fraction of MgO is more than or equal to 95 percent;
in the step 2), the mass ratio of the magnesium phosphate cementing material to the fly ash to the asbestos is 100: (25-35): (15-25); the water content of the magnesium phosphate slurry is 35-45 wt%;
in the step 3), the mass ratio of the magnesium phosphate slurry to the foaming agent solution to the foam stabilizer to the water reducer is 100: (10-15): (0.5-1.5): (0.3 to 1); the foaming agent solution is prepared by mixing a foaming agent and water, wherein the mass ratio of the foaming agent to the water is 1: (16-22); the foaming agent is a vegetable protein foaming agent, the foam stabilizer is polyvinyl alcohol, and the water reducing agent is a naphthalene water reducing agent;
in the step 4), the heating and curing specifically comprises the following steps: firstly heating to 70-80 ℃ and curing for 4-5 h, then heating to 200-250 ℃ and curing for 8-10 h;
the apparent density of the magnesium phosphate building block is 520-550 kg/m3The heat conductivity coefficient is less than 0.05W/(m.K), and the 7-day strength is more than 3 MPa.
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| CN201711365979.2A CN108191383B (en) | 2017-12-18 | 2017-12-18 | Method for manufacturing magnesium phosphate building block |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106242388A (en) * | 2016-07-18 | 2016-12-21 | 柳州弘蓝科技有限公司 | A kind of preparation method of light heat insulation blocks |
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| JP2001302327A (en) * | 2000-04-18 | 2001-10-31 | Sumitomo Kinzoku Kozan Siporex Kk | Production process of alc(autoclaved lightweight concrete) excellent in water repellency |
| WO2003031367A2 (en) * | 2001-08-10 | 2003-04-17 | Ceratech, Inc. | Composote materials and methods of making and using such composite materials |
| CN102344277A (en) * | 2010-08-05 | 2012-02-08 | 卞智铨 | Magnesium phosphate cement foamed lightweight wall building block |
| CN102515824B (en) * | 2011-11-30 | 2013-08-21 | 南京航空航天大学 | Super-light foam cement concrete and preparation method thereof |
| CN103508690A (en) * | 2013-09-17 | 2014-01-15 | 安徽循环经济技术工程院 | Novel inorganic binding material capable of bonding various substances and preparation method of novel inorganic binding material |
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| CN106242388A (en) * | 2016-07-18 | 2016-12-21 | 柳州弘蓝科技有限公司 | A kind of preparation method of light heat insulation blocks |
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| 废弃混凝土粉料在磷酸镁胶凝材料中的应用;曹洋等;《河南建材》;20100430;第76-77页 * |
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