CN102491658A - Method for preparing geopolymeric material from bentonite - Google Patents
Method for preparing geopolymeric material from bentonite Download PDFInfo
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- CN102491658A CN102491658A CN2011104056267A CN201110405626A CN102491658A CN 102491658 A CN102491658 A CN 102491658A CN 2011104056267 A CN2011104056267 A CN 2011104056267A CN 201110405626 A CN201110405626 A CN 201110405626A CN 102491658 A CN102491658 A CN 102491658A
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- exciting agent
- wilkinite
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- polymeric materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention discloses a method for preparing a geopolymeric material from bentonite. The method comprises the following steps of: uniformly mixing the bentonite with an excitant I, wherein the granularity of a solid phase in a mixture is less than or equal to 10 percent of the mass ratio of 200-mesh screen residues, and the mass ratio of the excitant I to the bentonite is 0.1-0.25; (2) calcining the mixture obtained in the step (1) at the high preserved temperature of 700-1,000 DEG C for 2-4 hours, and regrinding a calcining product to obtain chamotte powder, wherein granularity of the chamotte powder is less than or equal to 10 percent of the mass ratio of 200-mesh screen residues; and (3) doping an aqueous solution of an excitant II into the chamotte powder obtained in the step (2), mixing uniformly, compacting by vibrating, and preserving in a wet state at the temperature of 60-95 DEG C to obtain the geopolymeric material, wherein a water cement ratio, i.e., the mass ratio of the aqueous solution of the excitant II to the chamotte powder is 0.2-0.4; and the mass ratio of a solid phase in the excitant II and the non-calcined bentonite is 0-0.05. The method plays a remarkable role in expanding raw material sources, reducing cost, enhancing use convenience, and the like.
Description
Technical field
The invention belongs to the novel concrete field of material preparation, be specifically related to a kind of method of utilizing wilkinite to prepare the geology polymeric materials.
Background technology
Geology polymeric materials (abbreviating the ground polymers as) is also referred to as mineral polymeric material, native polywater mud, alkali-excited cement etc., is a kind of ecological environment-friendly type sal inorganic coagulation material that is expected to substitute portland cement that development in recent years is got up.It mainly refers to contain multiple amorphousness to the hemicrystalline type of three-dimensional aluminium silicate mineral polymkeric substance of zeolite.Its typical preparation procedure is: sal raw material → calcining activation → soluble alkali metal silico-aluminate dissolving excites → 20～120 ℃ of insulated curings.Ground polymers raw material sources are abundant, and carbon emission is low, and expansion-concentration rate is low; Rate of permeation is low, and early strength rises fast, and final strength is high; Acid resistance is strong, good heat resistance, and alkali-aggregate reaction is far below conventional portland cement; Endurance quality is good, is considered to progressively to replace that the energy consumption material consumption is high, carbon emission is high, environmental pollution is serious, the novel inorganic gelling material of the portland cement of acid resistance and poor durability.Davidovits uses kaolinite and calcined kaolinite to prepare geopolymer the earliest and applies for a patent.In recent years, as the product that has most application market to be worth, the research of flyash base polymers is concentrated relatively.At home, the real research of geology polymeric materials is started from this century and persistently overheating, more with the research that China University of Geosciences, China Mining University and Southeast China University deliver.
Patent CN1634795A provides a kind of preparation method of aluminium silicate mineral polymer materials, promptly uses the mixing solutions of alkalescence to excite clay class aluminum silicate raw material to prepare the method for polymer materials.Utilize common clay class aluminosilicate, i.e. kaolin perhaps contains the industrial waste raw materials such as flyash, slag of aluminosilicate, uses chemical activator, in the moulding of 5-10MPa pressure pressed, through the prepared in reaction mineral polymeric material.CN1882516 provides a kind of method that forms the geopolymer moulded parts; It comprises: the geopolymer concrete compsn that forms alkali metal containing or alkaline earth metal silicate component, basic metal or alkaline earth metal hydroxides, aggregate and water; Wherein the content of water is not enough to provide the concrete of slump, SiO
2With M
2The ratio of O is at least 0.8.Concrete casting is cast onto in the mould, make the concrete of moulding in mould, carry out fixed.Yet; The geology polymeric materials is used for substituting portland cement and still faces some subject matters: 1. raw material restriction; See from composition; The abundantest aluminum silicate raw material of content all can be used as ground polymers natural matter in the earth's crust, but practical study at most and can prepare sufficient intensity ground polymers still have only kaolin; The sal solid waste is then formed with textural difference big, is difficult to extensive utilization.2. preparation cost is higher, and during natural matter preparation ground polymers, the high grade kaolinite of calcining pretreatment and alkali silicate exciting agent all are the higher raw materials of cost; During with industrial solid wastes preparation ground polymers, though do not need precalcining, used exciting agent is identical with natural mineral raw, and its cost still need reduce.3. be that exciting agent and bicomponent system make its storage use inconvenience with water absorbability and hyperergic overbased salts, and environmental exposure is bigger.
Summary of the invention
The purpose of invention is to provide a kind of new wilkinite that utilizes to prepare the method for geology polymeric materials to existing defective in the existing preparation geology polymeric materials technology.
The inventive method comprises the step of following order:
(1) wilkinite and exciting agent I are mixed, the granularity of solid phase is Bi Li ≦ 10% that 200 mesh screen residues account for total mass in its mixture, and exciting agent I and bentonitic mass ratio are 0.1-0.25;
(2) with step (1) gained mixture 700 ℃-1000 ℃ soak calcining after 2-4 hour again with the levigate again chamotte powder that obtains of calcinate, the chamotte powder granularity is Bi Li ≦ 10% that 200 mesh screen residues account for total mass;
(3) in step (2) gained chamotte powder, mix the aqueous solution of exciting agent II, mix, obtained at 60-95 ℃ of moisture-keeping maintaining 2-4 days behind the vibratory compaction geology polymeric materials; Wherein, wc is that the mass ratio of the exciting agent II aqueous solution and chamotte powder is 0.25-0.45, in the exciting agent II solid phase with the calcining before bentonitic mass ratio be 0-0.05.
Said exciting agent I or NaOH, or KOH, or soda ash light NaCO
3The said exciting agent II or the NaOH aqueous solution, or the KOH aqueous solution.
The hybrid mode of said wilkinite of step (1) and exciting agent I is for first kind: with wilkinite and exciting agent I solid phase mixing, mix with the mode of grinding together; Second kind is: the bentonite in powder after the grinding carries out solid-liquid with the exciting agent I in being dissolved in water to be mixed, and stirs to reach uniform mixing; Wherein, be preferably second kind of hybrid mode.
Wilkinite according to the invention is meant with the smectite to be the clay that essential mineral is formed, and also contains quartz and other aluminium silicate mineral usually.For the performance of improving the geology polymeric materials can also add various gathering materials and inertia enhancing material in the material of step (3).
The present invention is through adjustment ground polymers preparation technology; Add the highly basic that should in subsequent technique, add at the raw material calcination stage and calcine (hereinafter referred is an alkali fusion) with raw material with other builder salts; To improve the geology polymerization activity of calcinate, solved the problem that exists in the existing ground polymers technology of preparing.It is rare to prepare the instance of geology polymeric materials with wilkinite in the existing document, and how undesirable effect is.Alkali fusion method of the present invention excites the meaning of bentonitic geology polymerization activity to be: 1. improved the strength property with the geology polymeric materials of wilkinite preparation, thereby expanded the raw material range of geology polymeric materials.2. be expected to reduce ground polymers cost and energy consumption and make things convenient for its use.
Embodiment
Through concrete experiment embodiment the present invention is described in further detail below.Equipment used is a conventional equipment in the embodiment of the invention, and raw materials used is conventional raw material.
Used bentonitic chemical composition analysis result sees table 1 in the embodiment of the invention.This wilkinite shows that through the polycrystalline X-ray diffraction analysis its thing is mainly alpha-quartz, smectite and calcite mutually, contains a small amount of limonite and chlorite in addition.Add suitable quantity of water with exciting agent I wiring solution-forming, the exciting agent I has NaOH, KOH and soda ash light NaCO
3Three kinds.With this exciting agent I liquid slurry and ball milling to particle diameter is that ratio that 200 mesh screen residues account for total mass is that 7% above-mentioned bentonite in powder is uniformly mixed into muddy; Obtaining grog then 700-1000 ℃ temperature lower calcination 2-4 hour, is that ratio that 200 mesh screen residues account for total mass is 8% chamotte powder with cooled chamotte powder ball milling to fineness again.With the solution of chamotte powder and exciting agent II be blended in stir 2-5 minute in the cement paste stirrer after, be poured into moulding in the punching block of 40 * 40 * 40mm, the wc of each instance select to make slurry can be on the vibration table because of the vibration closely knit Schwellenwert that liquefies.Made the geology polymeric materials under the humidity of vibratory compaction Hou Zai ≧ 90% and 60-95 ℃ the temperature in maintenance 2-4 days.The relevant prescription and the processing parameter of each instance see table 2 for details, and the ultimate compression strength of each corresponding instance test block sees table 3 for details.
The bentonitic chemical constitution of table 1
Table 2 prepares the Recipe condition of geology polymeric materials instance with wilkinite through the alkali fusion exciting method
Table 3 is through the ultimate compression strength of alkali fusion exciting method with the geology polymeric materials instance of wilkinite preparation
*Three days full water ultimate compression strength refers to after steam-cured on request three days the soaked ultimate compression strength of measuring in 1 day of normal temperature again
Full water ultimate compression strength in the table 3 be meant steam-cured on request after the soaked ultimate compression strength of measuring in 1 day of normal temperature again.Know by table 3, under close conservation system, 3 days ultimate compression strength of the geology polymeric materials that obtains with alkali fusion method processing wilkinite between 9-25MPa, maximum 25MPa; Three days full water ultimate compression strength between 5-21MPa, maximum 20.3MPa.All things considered, the coefficient of softening of test block is lower, and is most between 0.5-0.6, explains that water tolerance is not ideal.But with NaCO
3For the coefficient of softening of the test block of alkali fusion auxiliary agent (exciting agent I) preparation reaches 0.9, reach the water tolerance requirement of most material of construction.The present invention prepares geopolymer; When aquation, only add water and do not add the geopolymer (seeing instance 4,8-10) that modified water glass and other alkali-activator can also make sufficient intensity; This is to enlarging geology polymeric materials raw material sources, and reducing its preparation cost, improving its ease of use and promoting its application all has clear meaning.
Claims (3)
1. method of utilizing wilkinite to prepare the geology polymeric materials is characterized in that comprising the step of following order:
(1) wilkinite and exciting agent I are mixed, the granularity of solid phase is Bi Li ≦ 10% that 200 mesh screen residues account for total mass in its mixture, and exciting agent I and bentonitic mass ratio are 0.1-0.25;
(2) with step (1) gained mixture 700 ℃-1000 ℃ soak calcining after 2-4 hour again with the levigate again chamotte powder that obtains of calcinate, the chamotte powder granularity is Bi Li ≦ 10% that 200 mesh screen residues account for total mass;
(3) in step (2) gained chamotte powder, mix the aqueous solution of exciting agent II, mix, obtained at 60-95 ℃ of moisture-keeping maintaining 2-4 days behind the vibratory compaction geology polymeric materials; Wherein, wc is that the mass ratio of the exciting agent II aqueous solution and chamotte powder is 0.25-0.45, in the exciting agent II solid phase with the calcining before bentonitic mass ratio be 0-0.05.
2. the method for utilizing wilkinite to prepare the geology polymeric materials according to claim 1 is characterized in that: said exciting agent I or NaOH, or KOH, or soda ash light NaCO
3The said exciting agent II or the NaOH aqueous solution, or the KOH aqueous solution.
3. the method for utilizing wilkinite to prepare the geology polymeric materials according to claim 1 and 2; It is characterized in that: the hybrid mode of said wilkinite of step (1) and exciting agent I is for first kind: with wilkinite and exciting agent I solid phase mixing, mix with the mode of grinding together; Second kind is: the bentonite in powder after the grinding carries out solid-liquid with the exciting agent I in being dissolved in water to be mixed, and stirs to reach uniform mixing; Wherein, be preferably second kind of hybrid mode.
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| CN2011104056267A CN102491658B (en) | 2011-12-08 | 2011-12-08 | Method for preparing geopolymeric material from bentonite |
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| CN102491658B CN102491658B (en) | 2013-06-12 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106284827A (en) * | 2016-08-15 | 2017-01-04 | 马鞍山十七冶工程科技有限责任公司 | A kind of geo-polymer base Light trabs and preparation method |
| CN106277875A (en) * | 2016-08-11 | 2017-01-04 | 哈尔滨工业大学 | One-step method prepares the method for aluminosilicate polymer |
| CN106588107A (en) * | 2016-10-26 | 2017-04-26 | 马鞍山十七冶工程科技有限责任公司 | Geopolymer-based foam concrete and preparation method thereof |
| CN112048284A (en) * | 2020-08-24 | 2020-12-08 | 东南大学 | Geopolymer composite phase change material suitable for road subgrade, and preparation method and application thereof |
| CN112250332A (en) * | 2020-09-15 | 2021-01-22 | 山东和光新材料有限公司 | High-temperature-resistant cementing material prepared from flint clay serving as raw material |
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| WO2005019130A1 (en) * | 2003-08-22 | 2005-03-03 | Industrial Research Limited | Geopolymers and methods for their production |
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2011
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Patent Citations (4)
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| WO2005019130A1 (en) * | 2003-08-22 | 2005-03-03 | Industrial Research Limited | Geopolymers and methods for their production |
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Non-Patent Citations (1)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106277875A (en) * | 2016-08-11 | 2017-01-04 | 哈尔滨工业大学 | One-step method prepares the method for aluminosilicate polymer |
| CN106284827A (en) * | 2016-08-15 | 2017-01-04 | 马鞍山十七冶工程科技有限责任公司 | A kind of geo-polymer base Light trabs and preparation method |
| CN106588107A (en) * | 2016-10-26 | 2017-04-26 | 马鞍山十七冶工程科技有限责任公司 | Geopolymer-based foam concrete and preparation method thereof |
| CN112048284A (en) * | 2020-08-24 | 2020-12-08 | 东南大学 | Geopolymer composite phase change material suitable for road subgrade, and preparation method and application thereof |
| CN112250332A (en) * | 2020-09-15 | 2021-01-22 | 山东和光新材料有限公司 | High-temperature-resistant cementing material prepared from flint clay serving as raw material |
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| CN102491658B (en) | 2013-06-12 |
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