CN103896551A - Energy-saving technology for solving steam-free maintenance of magnesium oxychloride cement roof board by using anhydrous magnesium chloride - Google Patents
Energy-saving technology for solving steam-free maintenance of magnesium oxychloride cement roof board by using anhydrous magnesium chloride Download PDFInfo
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- CN103896551A CN103896551A CN201410081412.2A CN201410081412A CN103896551A CN 103896551 A CN103896551 A CN 103896551A CN 201410081412 A CN201410081412 A CN 201410081412A CN 103896551 A CN103896551 A CN 103896551A
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Abstract
The invention discloses an energy-saving technology for solving steam-free maintenance of a magnesium oxychloride cement roof board by using anhydrous magnesium chloride. The technology comprises the following steps: adopting a prepared anhydrous magnesium chloride solution; in order to solve control of temperature, adding a filling material which does not participate into reaction, for example, calcium carbonate powder, so as to reduce the reaction temperature of magnesium chloride cement; doping a retarder, such as ammonium phosphate, so that the product covers the surface of undissolved magnesium oxide to block the reaction speed of magnesium oxide and relieve centralized heating; and replacing the original magnesium chloride hexahydrate with anhydrous magnesium chloride. The heat generated by the anhydrous magnesium chloride in the hydration process is mainly utilized, and the reaction with magnesium oxide is accelerated by using the temperature, so that the magnesium oxychloride cement roof board can achieve the steam-free maintenance by adding anhydrous magnesium chloride, so that the product is quickly molded under the steam-free maintenance condition, an energy source consumed by conventional maintenance is removed, the energy is saved and the environmental protection is facilitated.
Description
Technical field
The present invention relates to a kind of maintenance of material of construction, especially a kind of non-evaporating foster power-saving technology that solves magnesia oxychloride cement roof boarding with Magnesium Chloride Anhydrous.
Background technology
Conventionally concrete product needs maintenance, and the time of general maintenance is all long, within 7 days, reaches molding intensity for common prefabricated components, within 30 days, reaches working strength.As the vapor cure that concrete member adopts, need curing pool or horizontal tunnel kiln.Producing in chlorine oxygen magnesium light concrete product, within the whole year eight months, all need with vapor cure the time moulding that goods could be in accordance with regulations.Take a manufacturing enterprise as example, the vapor cure of eight months just needs to consume 1000 tons, the coal of 4500-5000 kilocalorie, not only consumes a large amount of coal resources with this, has also polluted air and has destroyed environment.
Summary of the invention
The object of this invention is to provide a kind of utilization and control the heat that produces of Magnesium Chloride Anhydrous in hydration process, make to add the magnesia oxychloride cement roof boarding goods of Magnesium Chloride Anhydrous to realize the power-saving technology of self non-evaporating maintenance.
For realizing object of the present invention, the concrete technical scheme of taking is: utilize Magnesium Chloride Anhydrous to solve the non-evaporating foster power-saving technology of magnesia oxychloride cement roof boarding, chlorine oxygen magnesium in the Concrete of preparing magnesia oxychloride cement roof boarding, what employing was prepared uses anhydrous chlorides of rase magnesium solution; For solving the control of temperature, the one, increase the casting resin that does not participate in reaction, as calcium carbonate powders, to reduce the temperature of reaction of magnesium chloride cement; The 2nd, mix retardant, as ammonium phosphate, allowing its product cover does not have on the mgo surface of dissolving, to stop magnesian speed of response, alleviates and concentrates heat release.The preparation of anhydrous chlorides of rase magnesium solution, in container, to add 2/3rds water, add again Magnesium Chloride Anhydrous, add the amount of Magnesium Chloride Anhydrous at every turn, to stop in the time that the temperature of solution reaches 80-100 ℃, when temperature is down to the minimum rate of accumulation between 80-100 ℃, in container, place Magnesium Chloride Anhydrous again, until the temperature of solution is increased to the ceiling for accumulation between 80-100 ℃ again, so point progressively add Magnesium Chloride Anhydrous 4-5 time, finally obtain 40-45 ℃, the anhydrous chlorides of rase magnesium solution of concentration 24-25 ° Be '.The concrete stirring that the magnesium chloride solution of 40 ~ 45 ℃ is added to get ready, roof boarding is watering after concrete, at the indoor vapor cure 10-18 hour that exempts from.
The invention has the beneficial effects as follows: use without magnesium chloride and replace original magnesium chloride hexahydrate, mainly to utilize to control the heat that Magnesium Chloride Anhydrous produces in hydration process, accelerate itself and magnesian reaction by this temperature, make magnesia oxychloride cement roof boarding by adding Magnesium Chloride Anhydrous can reach self non-evaporating maintenance, make goods exempt to increase moulding rapidly in the situation of supporting, remove the energy that the conventional maintenance of Zheng vapour Yang Hu Alto consumes from, not only energy-conservation but also environmental protection.
Embodiment
Due to conventional making magnesia oxychloride cement roof boarding, principal reaction be magnesium oxide and magnesium chloride, it belongs to combination reaction, distribute heat in reaction process.Be magnesium chloride hexahydrate (containing six crystal water) because originally adopt, thereby reduced the heat in combination reaction.
The present invention finds and has utilized a kind of Magnesium Chloride Anhydrous, and it is the byproduct of producing titanium sponge.This Magnesium Chloride Anhydrous purity reaches 99 percent, and magnesium chloride hexahydrate is magnesium chloride hexahydrate because of containing six water, and purity only reaches 45 to 46 percent.Go dilution through a large amount of experiment showed, when the Magnesium Chloride Anhydrous by same weight and magnesium chloride hexahydrate with the water of same weight, the solution after magnesium chloride hexahydrate dilutes is temperature 30 while spending, and the solution temperature of Magnesium Chloride Anhydrous is 105 ℃; In the time Magnesium Chloride Anhydrous and magnesium chloride hexahydrate be all diluted to glass magnesium degree 24 spend, under same environment, magnesium chloride hexahydrate solution temperature is 30 ℃, Magnesium Chloride Anhydrous solution temperature is 80 ℃, as can be seen here, Magnesium Chloride Anhydrous in combination reaction liberated heat considerably beyond magnesium chloride hexahydrate institute liberated heat.
Through experiment, adopt anhydrous chlorides of rase magnesium solution (glass magnesium degree 24 is spent) and magnesium oxide mix, because the heat producing is large, moulding is too fast, and burning tendency has appearred in the goods after moulding, (be exactly because heat is too high, too concentrate heat release goods to occur crackle and do not have the phenomenon popular words of intensity to say be exactly burning shortcake), especially summer this phenomenon very outstanding, and be not easy solution.
Due to burning, surface temperature reaches more than 70 ℃, and goods internal temperature is got to 120-130 ℃, and the EO such as does not occur not, and slip has been tied the phenomenon of sclerosis.Through a large amount of experiment, scheme one is the consumption (being exactly not participate in reaction material) that increases casting resin as calcium carbonate powders etc., reduces the temperature of reaction of magnesium chloride cement; The 2nd, mix retardant ammonium phosphate, allowing its product cover does not have, on the mgo surface of dissolving, to stop magnesian speed of response, alleviates and concentrates heat release.By adopting above-mentioned two methods, prevent the cracking burn-off phenomenon that goods produce because of thermal expansion.
Prove by experiment, temperature of reaction is best results in the time of 40-45 ℃, can fully create the formation condition of crystallization phases, impels many generations can prevent that again the phase having generated from again decomposing and separate out free MgCl
2.The formula of roof boarding is used Magnesium Chloride Anhydrous instead, in its process of setting without steam-cured, process of setting excites by the magnesium chloride solution of 40-50 ℃ and the reacting of acceleration and MgO, the reaction of itself can be emitted certain heat, the accumulation heat that reacts in the short period of time output, is more than or equal to the heat that distributes (loss), makes goods temperature of reaction keep best 40-45 ℃ always, fully create the formation condition of 518 crystallization phasess, can improve in the short period of time moulding and the curing temperature of goods.Product does not need heating, steam-cured in process of production, has saved heating, steam-cured burning coal expense, only needs the heat that Magnesium Chloride Anhydrous and magnesium oxide combination reaction produce just can make product molding completely, reaches intensity, reaches standard.
Add in process of production heat insulation core material (composite polyphenylene plate, rock wool in roof boarding) simultaneously, there is fabulous thermal and insulating performance, the thermal property of the heat insulation core material that 70mm is thick is equivalent to the thick common brick wall of 1m, concerning life-time service, really accomplishes cool in summer and warm in winter.
When preparation anhydrous chlorides of rase magnesium solution, should first in a container, add after 2/3rds water, then add Magnesium Chloride Anhydrous, divide adding of progressively successively decreasing for 4-5 time, often within 30 minutes every other month, add once (object is by molten liquid temp reduction).To coordinate stirring simultaneously, scald people in order to avoid hot water spills.Add the amount of Magnesium Chloride Anhydrous at every turn, to stop, when temperature is down to the minimum rate of accumulation between 80-100 ℃, then place Magnesium Chloride Anhydrous in container, until the temperature of solution is increased to the ceiling for accumulation between 80-100 ℃ again in the time that the temperature of solution reaches 80-100 ℃.Dissolution time was than individual hour of traditional magnesium chloride hexahydrate proper extension 2-3.
Magnesium Chloride Anhydrous system adopts high-quality muriate and producing high purity metal magnesium under high-temperature vacuum state, forms through replacement(metathesis)reaction post crystallization, is the byproduct of MAGNESIUM METAL displacement metal titanium.Foreign matter content in its raw material muriate and MAGNESIUM METAL is easy to control.Do raw material production chlorine Gas magnesium cement product with 99% magnesium chloride, in process for preparation, generate owing to there is hydrolysis reaction.Magnesium Chloride Anhydrous makes 80 ~ 100 ℃ of saltwater brine temperature increase, in the time that temperature is reduced to 40 ~ 45 ℃, re-uses.Can shorten magnesite product dehydration setting time, with the saltwater brine of 99% magnesium chloride preparation, more than reducing 1-3 degree than traditional magnesium chloride hexahydrate glass magnesium degree.Theoretical consumption contrast: with 1000 kilograms of magnesium chloride hexahydrates (content 43%)=with 430 kilograms, 99% magnesium chloride.Actual amount contrast: 1000 kilogram of 99% magnesium chloride=2500 kilogram magnesium chloride hexahydrate (content 43%).
When magnesium chloride solution temperature is reduced to 40 ~ 45 ℃, use, carry out concrete stirring.Here said concrete, is to have added other required batchings of magnesia oxychloride cement roof boarding, as: magnesium oxide, industrial residue, sawdust, the poly-rare fiber of the third second, water-resisting agent small powder etc.
Roof boarding is watering after concrete, exempts from vapor cure 10-18 hours indoor, and intensity can reach the more than 60% of design strength, can shorten magnesite product dehydration setting time, and when especially temperature is low, advantage is more obvious.
There are aqueous magnesium chloride and Magnesium Chloride Anhydrous to sample performance test-results:
| Sample | Magnesium chloride type and temperature | 1 day anti-folding Mpa | 1 day resistance to compression Mpa | 7 days anti-folding Mpa | 7 days resistance to compression Mpa |
| Sample 1 | There is water (23 degree) | 3.4 | 9.8 | 8.85 | 29 |
| Sample 2 | Anhydrous (45 degree) | 5.7 | 16.2 | 10.8 | 34.8 |
As can be seen from the above table, due to the temperature difference of reactant, be larger to the shaping influence of goods.Shorter strength increase of time larger, later stage impact is more and more less.The anti-folding of one day has increased by 67%, and resistance to compression has increased by 65%.The anti-folding of 7 days has increased by 22%, and resistance to compression has increased by 20%.
Claims (3)
1. utilize Magnesium Chloride Anhydrous to solve the non-evaporating foster power-saving technology of magnesia oxychloride cement roof boarding, it is characterized in that: the chlorine oxygen magnesium in the Concrete of preparing magnesia oxychloride cement roof boarding, what employing was prepared uses anhydrous chlorides of rase magnesium solution; For solving the control of temperature, the one, increase the casting resin that does not participate in reaction, as calcium carbonate powders, to reduce the temperature of reaction of magnesium chloride cement; The 2nd, mix retardant, as ammonium phosphate, allowing its product cover does not have on the mgo surface of dissolving, to stop magnesian speed of response, alleviates and concentrates heat release.
2. utilize Magnesium Chloride Anhydrous to solve the non-evaporating foster power-saving technology of magnesia oxychloride cement roof boarding, it is characterized in that: the preparation of described anhydrous chlorides of rase magnesium solution, in container, to add 2/3rds water, add again Magnesium Chloride Anhydrous, add the amount of Magnesium Chloride Anhydrous at every turn, to stop in the time that the temperature of solution reaches 80-100 ℃, when temperature is down to the minimum rate of accumulation between 80-100 ℃, in container, place Magnesium Chloride Anhydrous again, until the temperature of solution is increased to the ceiling for accumulation between 80-100 ℃ again, so divide and progressively add Magnesium Chloride Anhydrous 4-5 time, finally obtain 40-45 ℃, the anhydrous chlorides of rase magnesium solution of concentration 24-25 ° of Be '.
3. utilize Magnesium Chloride Anhydrous to solve the non-evaporating foster power-saving technology of magnesia oxychloride cement roof boarding, it is characterized in that: in the concrete that the magnesium chloride solution of 40 ~ 45 ℃ is added to get ready, stir, roof boarding is watering after concrete, at the indoor vapor cure 10-18 hour that exempts from.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446062A (en) * | 2014-12-17 | 2015-03-25 | 中国科学院青海盐湖研究所 | Method for reducing hydration heat release of magnesium cement material |
| CN104478254A (en) * | 2014-12-17 | 2015-04-01 | 中国科学院青海盐湖研究所 | Method for reducing heat release during hydration of magnesium oxychloride cement |
| CN104529204A (en) * | 2014-12-17 | 2015-04-22 | 中国科学院青海盐湖研究所 | Method for reducing hydration heat release of magnesium oxychloride cement |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102060453A (en) * | 2010-12-14 | 2011-05-18 | 支亮 | Magnesium oxychloride concrete composite powder material and preparation process thereof |
| CN102285785A (en) * | 2011-06-14 | 2011-12-21 | 东南大学 | Modified magnesium oxychloride cement product and preparation method thereof |
| CN102674725A (en) * | 2012-04-24 | 2012-09-19 | 中国科学院青海盐湖研究所 | Novel magnesium oxychloride cement mixed by water |
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2014
- 2014-03-07 CN CN201410081412.2A patent/CN103896551A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102060453A (en) * | 2010-12-14 | 2011-05-18 | 支亮 | Magnesium oxychloride concrete composite powder material and preparation process thereof |
| CN102285785A (en) * | 2011-06-14 | 2011-12-21 | 东南大学 | Modified magnesium oxychloride cement product and preparation method thereof |
| CN102674725A (en) * | 2012-04-24 | 2012-09-19 | 中国科学院青海盐湖研究所 | Novel magnesium oxychloride cement mixed by water |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446062A (en) * | 2014-12-17 | 2015-03-25 | 中国科学院青海盐湖研究所 | Method for reducing hydration heat release of magnesium cement material |
| CN104478254A (en) * | 2014-12-17 | 2015-04-01 | 中国科学院青海盐湖研究所 | Method for reducing heat release during hydration of magnesium oxychloride cement |
| CN104529204A (en) * | 2014-12-17 | 2015-04-22 | 中国科学院青海盐湖研究所 | Method for reducing hydration heat release of magnesium oxychloride cement |
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Application publication date: 20140702 |