CN102617096A - Method for preparing aerated concrete by controlling iron direction using low-silicon iron tailings - Google Patents
Method for preparing aerated concrete by controlling iron direction using low-silicon iron tailings Download PDFInfo
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- CN102617096A CN102617096A CN2012100982805A CN201210098280A CN102617096A CN 102617096 A CN102617096 A CN 102617096A CN 2012100982805 A CN2012100982805 A CN 2012100982805A CN 201210098280 A CN201210098280 A CN 201210098280A CN 102617096 A CN102617096 A CN 102617096A
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Abstract
The invention discloses a method for preparing aerated concrete by controlling iron direction using low-silicon iron tailings, and belongs to the field of mine environment protection and the field of building materials. The specific method comprises the following steps of: wet-milling the iron tailings and silica sand until the fineness is 200-mesh and sieving 7.8 percent and 2.3 percent of residue respectively; proportioning 30-50 percent of iron tailings, 10-30 percent of silica sand, 22-27 percent of lime, 7-11 percent of cement and 3-7 percent of desulfurized gypsum; adding aluminum powder in an amount which accounts for 0.05-0.06 percent of the total mass of the abovementioned dry materials, warm water and a foam stabilizer in an amount which accounts for 0.4-1.2 percent of the total volume of the used water into the uniformly mixed slurry; mixing; and preparing the qualified aerated concrete product under different temperature and pressure steam curing and autoclaving conditions, wherein the absolute dry compressive strength reaches over 3.5 MPa, the volume density is 550-625 kg/m<3>, meanwhile, the direction control of iron ions of different valence states is realized, and the requirements of national standard on the performance index of the autoclaved aerated concrete are met.
Description
Technical field
The present invention relates to a kind of is the method that main raw material prepares gas concrete and control iron trend thereof to be rich in silicate low-silicon iron mine tailing.Be a kind of can vast scale, utilize multiple trade waste production to have the technology of preparing of high-strength light gas concrete.Belong to Mining Environment Conservation field and building material field.
Background technology
The fast development of Iron And Steel Industry has promoted economic growth and social progress, and discharging of a large amount of iron tailings and utilization ratio thereof are low, have brought the development of problems such as land occupation, the wasting of resources, contaminate environment influence society simultaneously.Gas concrete is to be main raw material with siliceous material (like silica sand, flyash etc.) and calcareous material (like lime, cement, slag etc.); The cellular concrete that forms through the chemical reaction mode; Be integrate advantages such as sound insulation, insulation, fire prevention, easy construction can reach building energy conservation 50% novel light wall body building material; Ban use of in country under the background condition of clay brick, gas concrete occupies increasing market as body of wall.Aggravation along with river sand and the shortage of partial area fly ash; Lime-cement-sand and lime-cement-two kinds of systems of flyash prepare gas concrete and receive stern challenge; And utilize iron tailings to produce gas concrete; Not only can solve the problem of shortage of resources, reduce the raw materials cost of the production of gas concrete, and can realize the utilization of iron tailings resource circulation.
The domestic and international at present utilization technology about iron tailings mainly is to concentrate on to prepare material of construction, comprises preparation vitrified brick, steam-cured standard square, cement products etc.Patent of invention " is the method for raw material production vitrified brick with the iron tailings " (number of patent application 200510027159, publication number CN1887770), disclosing and having adopted iron tailings is the method for raw material production vitrified brick.This invention iron tailings consumption is low, is difficult to a large amount of dissolving and utilizes iron tailings.Patent of invention " iron ore gangue sand and working method thereof " (number of patent application 200710176401, publication number CN101172835), disclosing with prepared from tailing sand of iron ore and light-burning magnesium powder is main raw material, after batching, moulding and maintenance, forms the technology of product.This added value of product is lower, and the haul distance of product is restricted.Patent of invention " metal tailings (skarn) is produced the method for cement or cement products " (number of patent application 200310109672.8; Publication number CN1621378), metal skarn mine tailing replacement cement water feedstock production cement that utilizes 10 ~ 35% or the technology that partly replaces the cement production cement products are disclosed.This patent has been continued to use the production technology route of traditional cement, and the volume of iron tailings is low.
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Summary of the invention
The objective of the invention is to overcome its low silicon, high Fe content gives and makes that the potential intensity that gas concrete brings is low, density big and the rimose problem; And give full play to characteristics such as gas concrete insulation, heat insulation, high-strength light, making large integral body of this type mine tailing dissolve to utilize becomes possibility.
A kind of method of utilizing low-silicon iron mine tailing control iron to move towards to prepare gas concrete, main raw material has low-silicon iron mine tailing, silica sand, lime, cement, desulfurated plaster, aluminium powder, water, admixture etc.Mine tailing used in the present invention is low silicon magnet mine tailing, and essential mineral has quartz, hornblende, blotite, chlorite etc.Because the silicone content of low-silicon iron mine tailing is lower; So the present invention doses silica sand and replenishes the required siliceous raw material of gas concrete,, reduce cement consumption in order to reduce the production cost of gas concrete; Add the industrial solid castoff desulfurated plaster, the Fe in the control iron tailings
3+Get into the aluminum-oxygen tetrahedron in the holder shellfish mullite, and Fe
2+Replaced C a then
2+Or Mg
2+, the density and the intensity index of the gas concrete of assurance preparation simultaneously satisfy the needs of gas concrete as materials for wall fully.
Concrete steps of the present invention are following:
1. will hang down silicon magnet mine tailing and in grinding machine, carry out wet-milling, the fineness of the iron tailings after levigate is 200 mesh screen residues 7.8%; Silica sand dried to water ratio be lower than 1%, silica sand is levigate to 200 mesh screen residues 2.3%; 200 mesh screen residues 4% of desulfurated plaster; Lime is that middling speed is cleared up lime, effective CaO content is not less than 65%, MgO 5%, digestion time 10 ~ 15min, 65 ~ 80 ℃ of digestion conditions.
2. by weight percentage with after 30 ~ 50% low silicon magnet mine tailings of the raw material in the step 1 and silica sand 10 ~ 30% difference wet-millings, add lime 22 ~ 27%, cement 7 ~ 11%; Desulfurated plaster 3 ~ 7% adds warm water in the slip that mixes, and water and siccative gross weight ratio (ratio of water to material) are controlled at 0.5 ~ 0.6; Account for the suds-stabilizing agent of total water amount volume ratio 4 ~ 12 ‰ more than the adding; Stirred for 90 ~ 150 seconds, add 30 ~ 50 seconds of aluminium powder restir of siccative gross weight 0.5 ~ 0.6 ‰ afterwards, the slip that obtains mixing; The insulation measure is set in the whipping process, and the molding temperature when guaranteeing slip casting is at 45 ~ 50 ℃.
3. the slip that stirs in the step 2 is poured into a mould, through quiet stop paying out gas, precuring, cutting after, put into autoclave and carry out high temperature and steam to press, obtain the finished product of gas concrete.The wherein quiet time of stopping paying out gas and precuring is 3.5 ~ 4.5 hours, 50 ~ 60 ℃ of precuring envrionment temperatures; High temperature steam to press through autoclave airtightly vacuumize, intensification, constant temperature, constant voltage, cooling, step-down.Autoclaved condition is: pressure-controlling is at 1.3 ~ 1.35Mpa, and temperature is controlled at 175 ~ 190 ℃, constant temperature (constant voltage) 6～8 hours.Technical process is as shown in Figure 1.
The mass percent of the main chemical compositions of aforesaid iron tailings is: SiO
240% ~ 65%; Al
2O
35% ~ 15%; Fe
2O
31% ~ 15%; FeO 1% ~ 15%; MgO0.01% ~ 10%; CaO 0.01% ~ 8%; K
2O 0.01% ~ 2%; Na
2O 0.01% ~ 2.5%; TiO
20% ~ 0.5%; SO
20.01 ~ 4%; Loss on ignition 0.01% ~ 3%, other are 0.01% ~ 1% years old.
The mass percent of the main chemical compositions of aforesaid silica sand is: SiO
270% ~ 95%; Al
2O
31% ~ 15%; Fe
2O
30.01% ~ 5%; FeO 0.01% ~ 5%; MgO 0.01% ~ 5%; CaO 0.01% ~ 5%; K
2O 0.01% ~ 3%; Na
2O 0.01% ~ 2.5%; Loss on ignition 0.01% ~ 3%, other are 0.01% ~ 1% years old.
The mass percent of the main chemical compositions of aforesaid desulfurated plaster is: SiO
20.01% ~ 5%; Al
2O
30.01% ~ 5%; Fe
2O
30.01% ~ 5%; FeO 0.01% ~ 5%; MgO 0.01% ~ 5%; CaO 30% ~ 70%; K
2O 0.01% ~ 2%; Na
2O 0.01% ~ 2.5%; SO
20.01 ~ 40%; Loss on ignition 0.01% ~ 6%.
The aluminium powder index request of aforesaid use, its active A l 90% ~ 100%, fineness requirement 0.08mm square hole sieve tails over 0% ~ 3.0%, and rate of gas generation 80% ~ 100% is got angry 1 ~ 20 minute time, 1 ~ 20 second of wetting ability.
The low silicon magnet mine tailing that ferric metasilicate is rich in utilization of the present invention prepares gas concrete and controls the trend of iron; So that the fully reaction under the high temperature autoclaved condition of the active constituent in the mine tailing raw material; A large approach of dissolving and utilizing is provided for the low silicon tailings that is rich in ferrosilicate; Realize the recycling treatment of mine tailing, reduce the pollution that brings to environment of storing up of mine tailing.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Embodiment 1:
1. will account for the wet-milling respectively of siccative gross weight 45% iron tailings and 15% silica sand, mine tailing is levigate to 200 mesh screen residues 7.8%; Silica sand is levigate to 200 mesh screen residues 2.3%, desulfurated plaster 200 mesh screen residues 4%; Lime is that middling speed is cleared up lime, effective CaO content 68%, MgO content 3.1%, 68 ℃ of digestion conditions.
2. after the iron tailings of step 1 being prepared mixed with the silica sand slip, adding accounted for siccative gross weight 25% lime, 10% cement and 5% desulfurated plaster; In slip, add warm water simultaneously, make ratio of water to material reach 0.5, and add the suds-stabilizing agent that accounts for total water amount volume ratio 9.10 ‰; Stir and add the aluminium powder that accounts for siccative gross weight 0.5 ‰ after 90 seconds; Restir 40 seconds, the slip that obtains mixing guarantees that the slip casting temperature is at 48 ℃.
3. the slip that stirs in the step 2 is poured into a mould, through quiet stop paying out gas, precuring, cutting after, put into autoclave and carry out high temperature and steam to press, obtain the finished product of gas concrete.The wherein quiet time of stopping paying out gas and precuring is 3.5 hours, 55 ℃ of precuring envrionment temperatures; Autoclave steams the compacting degree for vacuumizing 0.5 hour, heats up 1.5 hours, and the steaming pressure pressure is 1.32Mpa, 180 ℃ of temperature, and constant temperature (constant voltage) 7 hours was lowered the temperature 2 hours.
Performance index by the gas concrete of above-mentioned steps preparation are as shown in table 1.
The gas concrete performance index of table 1 embodiment 1 preparation
| Performance | The over dry volume density /（kg/m 3 ） | Over dry ultimate compression strength/MPa | Specific tenacity |
| Index | 590 | 4.12 | 6.98 |
Embodiment 2:
1. will account for the wet-milling respectively of siccative gross weight 40% iron tailings and 20% silica sand, mine tailing is levigate to 200 mesh screen residues 7.8%; Silica sand is levigate to 200 mesh screen residues 2.3%, desulfurated plaster 200 mesh screen residues 4%; Lime is that middling speed is cleared up lime, effective CaO content 65%, MgO content 4.3%, 66 ℃ of digestion conditions.
2. after the iron tailings of step 1 being prepared mixed with the silica sand slip, adding accounted for siccative gross weight 24% lime, 9% cement and 7% desulfurated plaster; In slip, add warm water simultaneously, make ratio of water to material reach 0.55, and add the suds-stabilizing agent that accounts for total water amount volume ratio 4.13 ‰; Stir and add the aluminium powder that accounts for siccative gross weight 0.52 ‰ after 100 seconds; Restir 30 seconds, the slip that obtains mixing guarantees that the slip casting temperature is at 45 ℃.
3. the slip that stirs in the step 2 is poured into a mould, through quiet stop paying out gas, precuring, cutting after, put into autoclave and carry out high temperature and steam to press, obtain the finished product of gas concrete.The wherein quiet time of stopping paying out gas and precuring is 4 hours, 60 ℃ of precuring envrionment temperatures; Autoclave steams the compacting degree for vacuumizing 0.5 hour, heats up 1.5 hours, and the steaming pressure pressure is 1.3Mpa, 175 ℃ of temperature, and constant temperature (constant voltage) 8 hours was lowered the temperature 2 hours.
Performance index by the gas concrete of above-mentioned steps preparation are as shown in table 2.
The gas concrete performance index of table 2 embodiment 2 preparations
| Performance | The over dry volume density /（kg/m 3 ） | Over dry ultimate compression strength/MPa | Specific tenacity |
| Index | 588 | 4.26 | 7.24 |
Embodiment 3:
1. will account for the wet-milling respectively of siccative gross weight 35% iron tailings and 25% silica sand, mine tailing is levigate to 200 mesh screen residues 7.8%; Silica sand is levigate to 200 mesh screen residues 2.3%, desulfurated plaster 200 mesh screen residues 4%; Lime is that middling speed is cleared up lime, effective CaO content 70%, MgO content 2.4%, 72 ℃ of digestion conditions.
2. after the iron tailings of step 1 being prepared mixed with the silica sand slip, adding accounted for siccative gross weight 23% lime, 11% cement and 6% desulfurated plaster; In slip, add warm water simultaneously, make ratio of water to material reach 0.53, and add the suds-stabilizing agent that accounts for total water amount volume ratio 9.43 ‰; Stir and add the aluminium powder that accounts for siccative gross weight 0.58 ‰ after 80 seconds; Restir 50 seconds, the slip that obtains mixing guarantees that the slip casting temperature is at 49 ℃.
3. the slip that stirs in the step 2 is poured into a mould, through quiet stop paying out gas, precuring, cutting after, put into autoclave and carry out high temperature and steam to press, obtain the finished product of gas concrete.The wherein quiet time of stopping paying out gas and precuring is 3.5 hours, 58 ℃ of precuring envrionment temperatures; Autoclave steams the compacting degree for vacuumizing 0.5 hour, heats up 1.5 hours, and the steaming pressure pressure is 1.35Mpa, 185 ℃ of temperature, and constant temperature (constant voltage) 8 hours was lowered the temperature 2 hours.
Performance index by the gas concrete of above-mentioned steps preparation are as shown in table 3.
The gas concrete performance index of table 3 embodiment 3 preparations
| Performance | The over dry volume density /（kg/m 3 ） | Over dry ultimate compression strength/MPa | Specific tenacity |
| Index | 586 | 4.24 | 7.24 |
Embodiment 4:
1. will account for the wet-milling respectively of siccative gross weight 50% iron tailings and 10% silica sand, mine tailing is levigate to 200 mesh screen residues 7.8%; Silica sand is levigate to 200 mesh screen residues 2.3%, desulfurated plaster 200 mesh screen residues 4%; Lime is that middling speed is cleared up lime, effective CaO content 75%, MgO content 1.8%, 80 ℃ of digestion conditions.
2. after the iron tailings of step 1 being prepared mixed with the silica sand slip, adding accounted for siccative gross weight 27% lime, 10% cement and 3% desulfurated plaster; In slip, add warm water simultaneously, make ratio of water to material reach 0.6, and add the suds-stabilizing agent that accounts for total water amount volume ratio 10.00 ‰; Stir and add the aluminium powder that accounts for siccative gross weight 0.55 ‰ after 70 seconds; Restir 40 seconds, the slip that obtains mixing guarantees that the slip casting temperature is at 45 ℃.
3. the slip that stirs in the step 2 is poured into a mould, through quiet stop paying out gas, precuring, cutting after, put into autoclave and carry out high temperature and steam to press, obtain the finished product of gas concrete.The wherein quiet time of stopping paying out gas and precuring is 3.5 hours, 50 ℃ of precuring envrionment temperatures; Autoclave steams the compacting degree for vacuumizing 0.5 hour, heats up 1 hour, and the steaming pressure pressure is 1.33Mpa, 180 ℃ of temperature, and constant temperature (constant voltage) 7 hours was lowered the temperature 2 hours.
Performance index by the gas concrete of above-mentioned steps preparation are as shown in table 4.
The gas concrete performance index of table 4 embodiment 4 preparations
| Performance | The over dry volume density /（kg/m 3 ） | Over dry ultimate compression strength/MPa | Specific tenacity |
| Index | 601 | 3.98 | 6.62 |
Embodiment 5:
1. will account for the wet-milling respectively of siccative gross weight 30% iron tailings and 30% silica sand, mine tailing is levigate to 200 mesh screen residues 7.8%; Silica sand is levigate to 200 mesh screen residues 2.3%, desulfurated plaster 200 mesh screen residues 4%; Lime is that middling speed is cleared up lime, effective CaO content 73%, MgO content 2%, 74 ℃ of digestion conditions.
2. after the iron tailings of step 1 being prepared mixed with the silica sand slip, adding accounted for siccative gross weight 22% lime, 11% cement and 7% desulfurated plaster; In slip, add warm water simultaneously, make ratio of water to material reach 0.53, and add the suds-stabilizing agent that accounts for total water amount volume ratio 12 ‰; Stir and add the aluminium powder that accounts for siccative gross weight 0.6 ‰ after 90 seconds; Restir 30 seconds, the slip that obtains mixing guarantees that the slip casting temperature is at 50 ℃.
3. the slip that stirs in the step 2 is poured into a mould, through quiet stop paying out gas, precuring, cutting after, put into autoclave and carry out high temperature and steam to press, obtain the finished product of gas concrete.The wherein quiet time of stopping paying out gas and precuring is 4 hours, 55 ℃ of precuring envrionment temperatures; Autoclave steams the compacting degree for vacuumizing 0.5 hour, heats up 1 hour, and the steaming pressure pressure is 1.34Mpa, 190 ℃ of temperature, and constant temperature (constant voltage) 8 hours was lowered the temperature 2 hours.
Performance index by the gas concrete of above-mentioned steps preparation are as shown in table 5.
The gas concrete performance index of table 5 embodiment 5 preparations
| Performance | The over dry volume density /（kg/m 3 ） | Over dry ultimate compression strength/MPa | Specific tenacity |
| Index | 581 | 4.13 | 7.11 |
Claims (5)
1. one kind is utilized the low-silicon iron mine tailing to control the method that iron moves towards to prepare gas concrete, it is characterized in that preparation process is following:
(1) will hang down silicon magnet mine tailing and in grinding machine, carry out wet-milling, the fineness of the iron tailings after levigate is 200 mesh screen residues 7.8%; Silica sand dried to water ratio be lower than 1%, silica sand is levigate to 200 mesh screen residues 2.3%; 200 mesh screen residues 4% of desulfurated plaster; Lime is that middling speed is cleared up lime, effective CaO content is not less than 65%, MgO 5%, digestion time 10 ~ 15min, 65 ~ 80 ℃ of digestion conditions;
(2) by weight percentage with after 30 ~ 50% low silicon magnet mine tailings of the raw material in the step 1 and silica sand 10 ~ 30% difference wet-millings, add lime 22 ~ 27%, cement 7 ~ 11%; Desulfurated plaster 3 ~ 7% adds entry in the slip that mixes, with water and siccative gross weight ratio control 0.5 ~ 0.6; Account for the suds-stabilizing agent of total water amount volume ratio 4 ~ 12 ‰ more than the adding; Stirred for 90 ~ 150 seconds, add 30 ~ 50 seconds of aluminium powder restir of siccative gross weight 0.5 ~ 0.6 ‰ afterwards, the slip that obtains mixing; The insulation measure is set in the whipping process, and the molding temperature when guaranteeing slip casting is at 45 ~ 50 ℃;
(3) slip that stirs in the step 2 is poured into a mould, through quiet stop paying out gas, precuring, cutting after, put into autoclave and carry out high temperature and steam to press, obtain the finished product of gas concrete; The wherein quiet time of stopping paying out gas and precuring is 3.5 ~ 4.5 hours, 50 ~ 60 ℃ of precuring envrionment temperatures; High temperature steam to press through autoclave airtightly vacuumize, intensification, constant temperature, constant voltage, cooling, step-down; Autoclaved condition is: pressure-controlling is at 1.3 ~ 1.35Mpa, and temperature is controlled at 175 ~ 190 ℃, constant temperature and pressure 6～8 hours.
2. according to the described a kind of method of utilizing low-silicon iron mine tailing control iron to move towards to prepare gas concrete of claim 1, it is characterized in that: the low-silicon iron mine tailing of use, the mass percent of its Chemical Composition is: SiO
240% ~ 65%; Al
2O
35% ~ 15%; Fe
2O
31% ~ 15%; FeO 1% ~ 15%; MgO0.01% ~ 10%; CaO 0.01% ~ 8%; K
2O 0.01% ~ 2%; Na
2O 0.01% ~ 2.5%; TiO
20% ~ 0.5%; SO
20.01 ~ 4%; Loss on ignition 0.01% ~ 3%, other are 0.01% ~ 1% years old.
3. according to the described a kind of method of utilizing low-silicon iron mine tailing control iron to move towards to prepare gas concrete of claim 1, it is characterized in that: the mass percent of the silica sand Chemical Composition of use is: SiO
270% ~ 95%; Al
2O
31% ~ 15%; Fe
2O
30.01% ~ 5%; FeO 0.01% ~ 5%; MgO 0.01% ~ 5%; CaO 0.01% ~ 5%; K
2O 0.01% ~ 3%; Na
2O 0.01% ~ 2.5%; Loss on ignition 0.01% ~ 3%, other are 0.01% ~ 1% years old.
4. according to the described a kind of method of utilizing low-silicon iron mine tailing control iron to move towards to prepare gas concrete of claim 1, it is characterized in that: the mass percent of the desulfurated plaster Chemical Composition of use is: SiO
20.01% ~ 5%; Al
2O
30.01% ~ 5%; Fe
2O
30.01% ~ 5%; FeO 0.01% ~ 5%; MgO 0.01% ~ 5%; CaO 30% ~ 70%; K
2O 0.01% ~ 2%; Na
2O 0.01% ~ 2.5%; SO
20.01 ~ 40%; Loss on ignition 0.01% ~ 6%.
5. hang down the method that silicon magnet mine tailing control iron moves towards to prepare gas concrete according to described a kind of utilization of claim 1; It is characterized in that: the aluminium powder index request of use; Its active A l 90% ~ 100%, fineness requirement 0.08mm square hole sieve tails over 0% ~ 3.0%, rate of gas generation 80% ~ 100%; Get angry 1 ~ 20 minute time in 1 ~ 20 second of wetting ability.
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|---|---|---|---|
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| CN104478466A (en) * | 2014-11-14 | 2015-04-01 | 安徽中龙建材科技有限公司 | Polypropylene fiber autoclaved aerated concrete (autoclaved lightweight concrete, ALC) plate and preparation method thereof |
| CN104609795A (en) * | 2015-02-26 | 2015-05-13 | 青岛华联装饰工程有限公司 | Aerated concrete block and preparation method thereof |
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| CN108033745A (en) * | 2017-11-20 | 2018-05-15 | 马鞍山豹龙新型建材有限公司 | A kind of Green production method of iron remaining fund air-entrained concrete building block |
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| CN109734369A (en) * | 2019-03-13 | 2019-05-10 | 浙江工业大学 | A kind of foam air-entrained concrete building block and preparation method thereof prepared using iron tailings as raw material normal temperature and pressure |
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| CN114605121A (en) * | 2022-03-25 | 2022-06-10 | 华润水泥技术研发有限公司 | Tungsten tailing autoclaved aerated concrete and preparation method thereof |
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| CN104478466A (en) * | 2014-11-14 | 2015-04-01 | 安徽中龙建材科技有限公司 | Polypropylene fiber autoclaved aerated concrete (autoclaved lightweight concrete, ALC) plate and preparation method thereof |
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| CN113511916A (en) * | 2021-05-10 | 2021-10-19 | 贵州凯得利建材有限公司 | Quartz sand fine powder high-strength aerated brick and production process thereof |
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