CN103693919A - Autoclaved aerated concrete blocks prepared from iron tailings and steel slags and preparation method thereof - Google Patents
Autoclaved aerated concrete blocks prepared from iron tailings and steel slags and preparation method thereof Download PDFInfo
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- CN103693919A CN103693919A CN201310720595.3A CN201310720595A CN103693919A CN 103693919 A CN103693919 A CN 103693919A CN 201310720595 A CN201310720595 A CN 201310720595A CN 103693919 A CN103693919 A CN 103693919A
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to autoclaved aerated concrete blocks prepared from iron tailings and steel slags and a preparation method thereof. The autoclaved aerated concrete blocks prepared by iron tailings and steel slags comprise the following components in parts by weight: 30-60 parts of iron tailings, 20-30 parts of steel slags, 30-54 parts of water, 0.04-0.10 part of a water-reducing dispersant, 0.5-1.0 part of an active additive B, 3-5 parts of quicklime, 2-3 parts of concrete, and 0.033-0.059 part of an aluminum powder. The 'wet fine grinding-chemical excitation-residual heat treatment' technical process is adopted, so as to solve the stability problem of the steel slag and improve the activity of the steel slags and the iron tailings, so that the steel slags can be used as the main gel material to partly replace the concrete or the quicklime, the residual heat steam is used to process the slurry, the production energy consumption is reduced, and the production cost is reduced.
Description
Technical field
The present invention relates to standby autoclave aerated concrete building block of a kind of iron tailings and prepared from steel slag and preparation method thereof.
Background technology
China is mining industry and big steel country, and the quantity discharged of mine tailing and slag is huge.Within 2012, China's crude steel output is 7.17 hundred million tons, produces 100,000,000 tons, slag, and mine tailing is piled up total amount and reached 8,000,000,000 tons; Be subject to utilizing the restriction of technology, the utilization ratio of these two kinds of large solid waste is all lower.A large amount of iron tailings and the accumulation of slag, easily cause atmosphere, soil and groundwater to pollute, and causes ecological damage, even causes serious geologic hazard.Through years of researches, China is having made some progress aspect the recycling of mine tailing, slag.At present about iron tailings, utilize technology mainly to concentrate on to prepare material of construction aspect.
Patent of invention CN1186782A provides a kind of technology of utilizing mine tailing autoclaved brick processed, has tentatively solved the agricultural technology problem of large volume tailing autoclaved.Patent of invention " take the method for iron tailings as raw material production vitrified brick " (number of patent application 200510027159) discloses the method that iron tailings is produced material of construction, but the iron tailings amount of dissolving is lower, and adopts the method for sintering, has greater environmental impacts.Patent of invention " a kind of iron tailings that utilizes is controlled the method that iron trend is prepared gas concrete " (application number 201210098280.5) discloses the method for utilizing iron tailings to produce gas concrete.This technology consumes natural silica Sand, cement etc. in a large number, and cost is also higher.Patent of invention " a kind of production method of utilizing the foam concrete block that slag makes " adopts the method for dry method grinding slag improve the activity of slag and eliminate the bad problem of stability, before grinding, need to dry, after grinding, also will add water slurrying, energy consumption is higher.In addition, the bad problem of steel slag stability is difficult to eliminate, and affects the volume stability of the finished product.Patent 201210253375.X discloses a kind of air-entrained concrete building block that utilizes special slag and tailing slag to produce, its use be a kind of special slag, therefore do not there is general applicability, and in its method, used and add the modifier that contains sial phase to carry out modification, suppress clearing up of slag Free CaO, free magnesium, to reach the object of improving steel slag stability, but relate in this patent application document, mine tailing and slag are not carried out to chemical activation to improve its active method.
Summary of the invention
The object of this invention is to provide a kind of iron tailings and standby autoclave aerated concrete building block of prepared from steel slag of utilizing, can realize the recycling to mine tailing slag, energy-conserving and environment-protective, and solved the active low and stability problem that slag exists of mine tailing, slag, prepared autoclave aerated concrete building block volume stability is good, and dry density and ultimate compression strength are high.
The present invention also aims to provide a kind of preparation method who utilizes iron tailings and the standby autoclave aerated concrete building block of prepared from steel slag, realize the resource utilization recycling of mine tailing, slag, energy-conserving and environment-protective, and solved the active low and poor problem of steel slag stability of mine tailing and slag, prepared autoclave aerated concrete building block volume stability is good, and dry density and ultimate compression strength are high.
The technical solution adopted in the present invention is as follows:
The component that autoclave aerated concrete building block of the present invention comprises following weight part:
Iron tailings 30 ~ 60 weight parts,
Slag 20 ~ 30 weight parts,
Water 30 ~ 54 weight parts,
Diminishing dispersant A 0.04 ~ 0.10 weight part,
Coagent B 0.5 ~ 1.0 weight part,
Unslaked lime 3 ~ 5 weight parts,
Cement 2 ~ 3 weight parts,
Aluminium powder 0.033 ~ 0.059 weight part,
Dry state specific surface area after wherein said iron tailings and slag wet-milling is 453 ~ 507m
2/ kg, a kind of and sodium lignosulfonate of described diminishing dispersant A in triethanolamine oleate, trolamine or ethylene glycol, a kind of composition in sulfonated melamine compound resin, the weight ratio of the former with the latter is 1:(1.5 ~ 2.5),
Described coagent B by monocalcium phosphate, terra alba and sodium-chlor form, three's weight ratio is 1:(1 ~ 2): (0.5 ~ 1.5).
Further, in the chemical constitution of iron tailings of the present invention, the content of silicon-dioxide is 55.35 ~ 64.92%, and before wet-milling, the maximum particle diameter of iron tailings is 2mm.
Further, slag chemical constitution Free CaO content of the present invention is 3.42～5.33%, and before wet-milling, slag maximum particle diameter is 2mm.
Further, diminishing dispersant A of the present invention is comprised of triethanolamine oleate and calcium lignin sulphonate, the former with the latter's weight ratio be 1:2.
Further, coagent B of the present invention by monocalcium phosphate, terra alba and sodium-chlor form, three's weight ratio is 1:2:1.
Further, unslaked lime of the present invention is middling speed calcium lime powder, 0.08 mm square hole sieve screen over-size≤15%, the content of free calcium oxide >=65%, content of magnesia≤5%.
The preparation method of autoclave aerated concrete building block of the present invention comprises the steps:
Step 1: iron tailings, slag, water, diminishing dispersant A be (30～60) by weight: (20～30): (30～54): the ratio of (0.04～0.10) mixes, through wet-milling, make mixed pulp, wherein in mixed pulp, the dry state specific surface area of solid materials is 453 ~ 507m
2/ kg;
Step 2: the mixed pulp in step 1 is sent into digester after Removal of iron with flotation, then add the coagent B of 0.5～1 part to mix, pass into steam in digester, keep 3～5 hours at 45～60 ℃ of temperature;
Step 3: postdigestive mixed pulp in step 2 is sent in stirrer, after adding again the cement of the unslaked lime of 3～5 parts and 2～3 parts, stir 30 seconds, then after adding the aluminium powder of 0.033～0.059 part to mix fast, obtain slip, slip makes autoclave aerated concrete building block through conventional operation.
Further, conventional operation described in the preparation method of autoclave aerated concrete building block of the present invention is described slip through building, get angry, quietly stop, cutting action obtains idiosome, and idiosome obtains autoclave aerated concrete building block with the steam steam press maintenance of 1.2MPa after 8 hours.
Further, the steam described in preparation method's step 1 of autoclave aerated concrete building block of the present invention is the afterheat steam producing in air-entrained concrete building block preparation process.
The present invention adopts mine tailing-slag mixing wet-milling, stability to process and activity excitation technological process is prepared autoclave aerated concrete building block.
The compound dry state specific surface area of the iron tailings after wet-milling and slag is 453 ~ 507m in the present invention
2/ kg, effective silicon that compound more carefully participates in hydration reaction is more, is more conducive to the raising of its activity, can replace part of cement (or lime); But, the thinner free calcium oxide that it comes out of compound is more, and if compound not carried out to modification, a large amount of free calcium oxides are wherein cleared up into calcium hydroxide volumetric expansion, in building block, this expansion stress is concentrated while discharging and can be caused building block cracking, affects quality product.Add coagent B, be conducive to further excite the activity of slag, promote clearing up of slag Free CaO simultaneously, improve its stability.The present invention adopts wet-grinding technology and relative device, and in wet-milling process, mine tailing and slag grind altogether, produces micro-abrading-ball effect in the situation that diminishing dispersant A exists, and is conducive to the super-refinement of mine tailing.
Afterheat steam of the present invention refers to the maintenance steam that autoclave aerated concrete building block maintenance is discharged after complete from autoclave.
Positively effect of the present invention
The present invention's employing " wet method is levigate-chemi-excitation-Heat Treatment " and Technology, solved the stability problem of slag, improved the activity of slag and mine tailing, make slag replace part of cement or unslaked lime as main gelling material, utilize afterheat steam to process slurry, reduce production energy consumption, saved production cost.The production technique of autoclave aerated concrete building block of the present invention, can reduce by 20% unslaked lime or cement consumption, when realizing mine tailing (replacement natural sand) recycling, increase by 30% solid slag consumption, fundamentally solved the bad problem of steel slag stability, production unit volume add energy-conservation 25% left and right of building block product.
Embodiment
The chemical constitution of the iron tailings in the embodiment of the present invention is silicon-dioxide 55.35 ~ 64.92%, aluminium sesquioxide 1.84 ~ 7.10%, calcium oxide 6.47 ~ 19.05%, magnesium oxide 2.37 ~ 14.51%, ferric oxide 5.80 ~ 11.96%, loss on ignition 4.95 ~ 12.03%, and iron tailings maximum particle diameter is 2mm.To iron tailings activity influence maximum is the content of silicon-dioxide, when in the iron tailings using, the content of silicon-dioxide meets 55.35 ~ 64.92%, can use component proportion of the present invention and method, the activity of giving full play to iron tailings reduces cement or lime consumption, the object of the building block that processability is good to reach.
Slag chemical constitution in the embodiment of the present invention is silica 1 1.64 ~ 18.05%, aluminium sesquioxide 1.28 ~ 5.84%, calcium oxide 46.22 ~ 63.76%, magnesium oxide 4.12 ~ 9.77%, ferric oxide 11.90 ~ 21.41%, its Free CaO content is 3.42～5.33%, free magnesium is 0.13 ~ 0.74%, and slag maximum particle diameter is 2mm.Steel slag stability is had the greatest impact for the content of free calcium oxide, when the content of the slag Free CaO using meets 3.42～5.33%, can use component proportion of the present invention and method, improve steel slag stability, give full play to slag activity and reduce cement or lime consumption, the object of the building block that processability is good to reach.
Embodiment mono-
1. mixed pulp modification
The chemical constitution of iron tailings is silicon-dioxide 55.35%, aluminium sesquioxide 7.10%, calcium oxide 19.05%, magnesium oxide 4.01%, ferric oxide 6.37%, loss on ignition 7.67%, the chemical constitution of slag is silica 1 8.05%, aluminium sesquioxide 2.83%, calcium oxide 46.22%, magnesium oxide 8.36%, ferric oxide 21.41%, and its Free CaO content is 3.42, free magnesium is 0.66%.
By the iron tailings of 60 parts, 21 parts slag, 48 parts water, 0.081 part diminishing dispersant A (diminishing dispersant A consist of triethanolamine oleate: after sodium lignosulfonate=1:2) weighing in proportion, send in grinding machine and grind into mixed pulp, wherein the dry state specific surface area of the solid materials in mixed pulp is 507m
2/ kg.Above-mentioned mixed pulp is sent in digester after Removal of iron with flotation, then add 0.9 part coagent B(coagent B consist of monocalcium phosphate: terra alba: sodium-chlor=1:2:1); In tank, pass into afterheat steam, at 46 ℃ of temperature, keep 3 hours.
2. autoclaved aerated block is produced
Mixed pulp after above-mentioned digestion modification is sent in mixing machine, the cement mixing and stirring 30 seconds that adds the calcium lime powder of 5 parts and 2 parts, after adding again 0.049 part of aluminium powder to mix fast, obtain slip, slip through building, get angry, quietly stop, cutting action obtains idiosome, idiosome obtains autoclave aerated concrete building block with the steam steam press maintenance of 1.2MPa after 8 hours.
Autoclave aerated concrete building block salient features: dry density 604kg/m
3, ultimate compression strength 4.8 MPa, other performance is qualified.
Embodiment bis-
1. mixed pulp modification
The chemical constitution of iron tailings is silicon-dioxide 62.09%, aluminium sesquioxide 1.84%, calcium oxide 9.27%, magnesium oxide 7.49%, ferric oxide 5.80%, loss on ignition 12.03%, the chemical constitution of slag is silica 1 5.43%, aluminium sesquioxide 5.84%, calcium oxide 55.87%, magnesium oxide 4.12%, ferric oxide 17.09%, and its Free CaO content is 4.78%, free magnesium is 0.13%.
By the iron tailings of 45 parts, 25 parts slag, 42 parts water, 0.07 part diminishing dispersant A (diminishing dispersant A consist of triethanolamine oleate: after sodium lignosulfonate=1:1.5) weighing in proportion, send in grinding machine and grind into mixed pulp, wherein the dry state specific surface area of the solid materials in mixed pulp is 475m
2/ kg.Above-mentioned mixed pulp is sent in digester after Removal of iron with flotation, then add 0.8 part coagent B(coagent B consist of monocalcium phosphate: terra alba: sodium-chlor=1:1:1.5); In tank, pass into afterheat steam, at 53 ℃ of temperature, keep 4 hours.
2. autoclaved aerated block is produced
Mixed pulp after above-mentioned digestion modification is sent in mixing machine, add again 4.2 parts of unslaked limes and 2.4 parts of cement, mix and blend 30 seconds, add again 0.042 part of aluminium powder, after mixing, obtain slip, slip through building, get angry, quietly stop, cutting action obtains idiosome, idiosome obtains autoclave aerated concrete building block with the steam steam press maintenance of 1.2MPa after 12 hours.
Autoclave aerated concrete building block salient features: dry density 620kg/m
3, ultimate compression strength 3.7 MPa, other performance is qualified.
Embodiment tri-
1. mixed pulp modification
The chemical constitution of iron tailings is silicon-dioxide 57.40%, aluminium sesquioxide 4.89%, calcium oxide 6.47%, magnesium oxide 14.51%, ferric oxide 8.16%, loss on ignition 4.95%, the chemical constitution of slag is silica 1 3.36%, aluminium sesquioxide 1.28%, calcium oxide 63.76%, magnesium oxide 5.83%, ferric oxide 15.29%, and its Free CaO content is 5.33%, free magnesium is 0.35%.
By the iron tailings of 42 parts, 30 parts slag, 43 parts water, 0.072 part diminishing dispersant A (diminishing dispersant A consist of triethanolamine oleate: after sodium lignosulfonate=1:2.5) weighing in proportion, send in grinding machine and grind into mixed pulp, wherein the dry state specific surface area of the solid materials in mixed pulp is 491m
2/ kg.Above-mentioned mixed pulp is sent in digester after Removal of iron with flotation, then add 0.6 part coagent B(coagent B consist of monocalcium phosphate: terra alba: sodium-chlor=1:2:0.5); In tank, pass into afterheat steam, at 58 ℃ of temperature, keep 5 hours.
2. autoclaved aerated block is produced
Mixed pulp after above-mentioned digestion modification is sent in mixing machine, add 3 parts of unslaked limes and 3 parts of cement mixing and stirring 30 seconds, after adding again 0.043 part of aluminium powder to mix fast, obtain slip, slip through building, get angry, quietly stop, cutting action obtains idiosome, idiosome obtains autoclave aerated concrete building block with the steam steam press maintenance of 1.2MPa after 8 hours.
Autoclave aerated concrete building block salient features: dry density 612kg/m
3, ultimate compression strength 3.8 MPa, other performance is qualified.
Embodiment 4
1. mixed pulp modification
The chemical constitution of iron tailings is silicon-dioxide 64.92%, aluminium sesquioxide 3.08%, calcium oxide 10.45%, magnesium oxide 2.37%, ferric oxide 11.96%, loss on ignition 5.74%, the chemical constitution of slag is silica 1 1.64%, aluminium sesquioxide 5.05%, calcium oxide 60.28%, magnesium oxide 9.77%, ferric oxide 11.90%, and its Free CaO content is 5.16%, free magnesium is 0.74%.
By the iron tailings of 40 parts, 30 parts slag, 42 parts water, 0.040 part diminishing dispersant A (diminishing dispersant A consist of ethylene glycol: after sulfonated melamine compound resin=1:2) weighing in proportion, send in grinding machine and grind into mixed pulp, wherein the dry state specific surface area of the solid materials in mixed pulp is 453m
2/ kg.Above-mentioned mixed pulp is sent in digester after Removal of iron with flotation, then add 0.5 part coagent B(coagent B consist of monocalcium phosphate: terra alba: sodium-chlor=1:1.5:0.9); In tank, pass into afterheat steam, at 59 ℃ of temperature, keep 3.5 hours.
2. autoclaved aerated block is produced
Mixed pulp after above-mentioned digestion modification is sent in mixing machine, add 3.7 parts of unslaked limes and 2.8 parts of cement mixing and stirring 30 seconds, after adding again 0.059 part of aluminium powder to mix fast, obtain slip, slip through building, get angry, quietly stop, cutting action obtains idiosome, idiosome obtains autoclave aerated concrete building block with the steam steam press maintenance of 1.2MPa after 8 hours.
Autoclave aerated concrete building block salient features: dry density 609kg/m
3, ultimate compression strength 4.2 MPa, other performance is qualified.
Experimental example
The indices such as embodiment 1 ~ 4 gained building block outward appearance, intensity all can meet < < autoclave aerated concrete building block > > A3.5B06 class requirement; The comparative example that do not add coagent B digestion modification corresponding with embodiment 1 ~ 4, gained building block has connectivity crackle, and the indexs such as its outward appearance and intensity can not meet A3.5B06 class requirement.
Claims (9)
1. the standby autoclave aerated concrete building block of iron tailings and prepared from steel slag, is characterized in that the component that it comprises following weight part:
Iron tailings 30 ~ 60 weight parts,
Slag 20 ~ 30 weight parts,
Water 30 ~ 54 weight parts,
Diminishing dispersant A 0.04 ~ 0.10 weight part,
Coagent B 0.5 ~ 1.0 weight part,
Unslaked lime 3 ~ 5 weight parts,
Cement 2 ~ 3 weight parts,
Aluminium powder 0.033 ~ 0.059 weight part,
Dry state specific surface area after wherein said iron tailings and slag wet-milling is 453 ~ 507m
2/ kg,
A kind of and the sodium lignosulfonate of described diminishing dispersant A in triethanolamine oleate, trolamine or ethylene glycol, a kind of composition in sulfonated melamine compound resin, the weight ratio of the former with the latter is 1:(1.5 ~ 2.5),
Described coagent B by monocalcium phosphate, terra alba and sodium-chlor form, three's weight ratio is 1:(1 ~ 2): (0.5 ~ 1.5).
2. a kind of iron tailings according to claim 1 and the standby autoclave aerated concrete building block of prepared from steel slag, is characterized in that in described iron tailings, dioxide-containing silica is 55.35 ~ 64.92%, and before wet-milling, maximum particle diameter is 2 mm.
3. a kind of iron tailings according to claim 1 and the standby autoclave aerated concrete building block of prepared from steel slag, is characterized in that the free calcium oxide content of described slag is 3.42～5.33%, and the maximum particle diameter before wet-milling is 2mm.
4. a kind of iron tailings according to claim 1 and the standby autoclave aerated concrete building block of prepared from steel slag, is characterized in that described diminishing dispersant A is comprised of triethanolamine oleate and calcium lignin sulphonate, and the weight ratio of the former with the latter is 1:2.
5. a kind of iron tailings according to claim 1 and the standby autoclave aerated concrete building block of prepared from steel slag, is characterized in that described coagent B is comprised of monocalcium phosphate, terra alba and sodium-chlor, and three's weight ratio is 1:2:1.
6. the standby autoclave aerated concrete building block of a kind of iron tailings and prepared from steel slag according to claim 1, is characterized in that described unslaked lime is middling speed calcium lime powder, 0.08 mm square hole sieve screen over-size≤15%, the content of free calcium oxide >=65%, content of magnesia≤5%.
7. according to a preparation method for the iron tailings described in any one of claim 1 ~ 6 and the standby autoclave aerated concrete building block of prepared from steel slag, it is characterized in that it comprises the steps:
Step 1: iron tailings, slag, water, diminishing dispersant A be (30～60) by weight: (20～30): (30～54): the ratio of (0.04～0.10) mixes, through wet-milling, make mixed pulp, wherein in mixed pulp, the dry state specific surface area of solid materials is 453 ~ 507m
2/ kg;
Step 2: the mixed pulp in step 1 is sent into digester after Removal of iron with flotation, then add the coagent B of 0.5～1 part to mix, pass into steam in digester, keep 3～5 hours at 45～60 ℃ of temperature;
Step 3: postdigestive mixed pulp in step 2 is sent in stirrer, after adding again the cement of the unslaked lime of 3～5 parts and 2～3 parts, stir 30 seconds, then after adding the aluminium powder of 0.033～0.059 part to mix fast, obtain slip, slip makes autoclave aerated concrete building block through conventional operation.
8. the preparation method of the standby autoclave aerated concrete building block of iron tailings according to claim 7 and prepared from steel slag, it is characterized in that described conventional operation be described slip through building, get angry, quietly stop, cutting action obtains idiosome, idiosome obtains autoclave aerated concrete building block with the steam steam press maintenance of 1.2MPa after 8 hours.
9. the preparation method of the standby autoclave aerated concrete building block of iron tailings according to claim 7 and prepared from steel slag, is characterized in that the steam described in step 1 is the afterheat steam producing in air-entrained concrete building block preparation process.
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| CN104130007A (en) * | 2014-08-11 | 2014-11-05 | 广西启利新材料科技股份有限公司 | Autoclaved aerated lightweight partition board taking steel slag as raw materials |
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| 杨凡: "不同激发剂对矿渣水泥强度的影响", 《铁道技术监督》 * |
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