CN103170393A - Preparation method of superfine slag powder - Google Patents
Preparation method of superfine slag powder Download PDFInfo
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- CN103170393A CN103170393A CN2013100476390A CN201310047639A CN103170393A CN 103170393 A CN103170393 A CN 103170393A CN 2013100476390 A CN2013100476390 A CN 2013100476390A CN 201310047639 A CN201310047639 A CN 201310047639A CN 103170393 A CN103170393 A CN 103170393A
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Abstract
The invention provides a preparation method of superfine slag powder. The method comprises the following steps of: mixing the slag powder with a first grinding medium, and grinding for 45-90minutes in a ball mill; (2) adding a second grinding medium into the step (1), and continuously grinding for 180-480minutes to obtain the superfine slag powder. The first grinding medium is a mixture consisting of steel balls with diameters of 60mm, 40mm and 20mm as well as steel columns with diameters of 20mm and 10mm. The second grinding medium is steel balls with diameter of 20mm. According to the preparation method provided by the invention, a one-step grinding method in conventional technology is replaced by a two-step grinding method, and the grinding time in each step is shortened, and the grinding medium in special grade is matched to prepare the superfine slag powder. The superfine slag powder provided by the invention has the advantages of simpleness in preparation method and low in cost, and is suitable for engineering application.
Description
Technical field
The present invention relates to a kind of preparation method of ultrafine slag powder, belong to building material field.
Background technology
Slag is the main solid waste of ferrous metals industry, has higher lateral reactivity.At present, slag, except in order to the operating mine slag cement, also can be used its levigate slag powders that is prepared into as concrete admixture.When slag powders is used as concrete admixture, not only can save cement consumption, reduce concrete cost, can improve submicroscopic structure in concrete simultaneously, reduce the concrete heat of hydration and improve the performances such as mobility, workability and pumpability of concrete construction.One of basic demand when slag powders is used as concrete admixture is that enough large specific area must be arranged, because specific area is higher, its activity index is higher, and the high reaction speed that can accelerate cement of activity index, thereby can greatly improve cement and concrete early strength.
Grinding to slag powders in the architectural engineering application of China generally adopts traditional ball mill to carry out, large because ball mill has an inventory, and the advantage that equipment cost is low is applicable to the engineering application.But, ball mill is in the slag powders process of lapping, because inventory is large, there is the long problem of residence time of material, while especially preparing super finely ground slag, the desired specific area of ultrafine slag powder to be prepared is larger, need the time of grinding longer, and residence time of material length can cause occurring in process of lapping the dynamic equilibrium of " grinding-reunion ".This is mainly because material while grinding in ball mill, and after its specific area increases, specific surface energy also increases; thereby subparticle can be assembled mutually, in this state; even extend milling time, material also difficulty grinds carefullyyer, sometimes even can make the particle chap again.Due to the existence of the problems referred to above, through the specific area of the material of ball mill grinding, focus mostly at 360 ~ 430m
2/ kg.And, for fear of the dynamic equilibrium of " grinding-reunion ", in prior art, after in ball mill, slag powders being carried out to a step grinding, by satisfactory specific area, be all 360 ~ 430m usually
2the slag powders of/kg is separated and is removed after selecting powder, and remaining specific area is less is that the slag powders that particle diameter is larger continues to be ground in ball mill again, prepares the slag powders of satisfactory specific area.
In order to solve the problems of the technologies described above, Chinese patent literature CN101613190A disclose a kind of utilize Vertical Mill and roll mill combine the preparation specific area be 800 ~ 2000m
2the super-active slag powder of/kg, the specific area of this super-active slag powder and activity index, far above national Specification, have advantages of that fineness is large, active high.Its preparation method comprises that (1) dry blast-furnace slag to moisture≤0.6wt% under 105 ℃ of conditions; (2) blast-furnace slag after drying is ground with Vertical Mill; (3) select specific area and be greater than 430m
2the fine powder of/kg, specific surface is less than 430m
2the meal of/kg returns to Vertical Mill to be continued to grind; (4) select specific area and be greater than 430m
2the fine powder of/kg carries out fine grinding with the three-ring type roll mill, and obtaining specific area is 800 ~ 2000m
2/ kg, the super-active slag powder of average grain diameter≤4 micron; (5) by collector, collected, products obtained therefrom is super-active slag powder.
Above-mentioned technology is mainly carried out preliminary grinding by Vertical Mill to slag, obtains specific area and is greater than 430m
2after the fine powder of/kg, then with the three-ring type roll mill, this fine powder is carried out to fine grinding and can prepare super-active slag powder.In above-mentioned process of lapping, because Vertical Mill and roll mill have advantages of that flow process is simple and an inventory is few, thereby make material time of staying in mill short, and the particle after grinding can not be reunited at short notice, is 800 ~ 2000m thereby can prepare specific area
2the super-active slag powder of/kg.But in above-mentioned technology, owing to selecting two kinds of milling apparatus of Vertical Mill and three-ring type roll mill to be ground slag, there is the problem that the single treatment amount is few and equipment price is expensive of slag powders, thereby cause the preparation cost of super-active slag powder high, and then make ultrafine slag powder limited in actual engineering application.Obtaining and how to use ball mill to grind slag the super-active slag micro mist that preparation cost is low, be suitable for commercial Application, is that those skilled in the art want to solve but unsolved technical problem always.
Summary of the invention
Technical problem to be solved by this invention is in prior art, still to utilize ball mill to carry out the preparation of ultrafine slag powder, and then a kind of method of utilizing ball mill to prepare ultrafine slag powder is provided.
In order to solve the problems of the technologies described above, the invention provides a kind of preparation method of ultrafine slag powder, comprise the steps:
(1) slag powders is mixed with the first abrasive media, grind 45 ~ 90min in ball mill;
(2) add the second abrasive media in the material after described step (1) is ground, continue to grind 180 ~ 480min, prepare ultrafine slag powder of the present invention;
Wherein, described the first abrasive media be diameter be,, steel ball, and diameter is, the mixture of steel column;
Described the second abrasive media is the steel ball that diameter is.
In mass, described the first abrasive media is (7 ~ 9) with described the second abrasive media addition ratio: (1 ~ 3).
In the quality of the first abrasive media, described steel ball is (20 ~ 35) with the addition ratio of described steel ball, described steel ball, described steel column, described steel column: (5 ~ 15): (10 ~ 25): (2 ~ 15): (3 ~ 20).
In described the first abrasive media and described the second abrasive media gross mass, the addition of described slag powders is 5 ~ 25wt%.
Described slag powders is S75 grade slag powder, S95 grade slag powder or S105 grade slag powder.
Specific area>=the 300m of described S75 slag powders
2/ kg, 7d activity index>=55%, 28d activity index>=75%, water content≤1.0wt%.
S95 slag powders specific area>=400m
2/ kg, 7d activity index>=75%, 28d activity index>=95%, water content≤1.0wt%.
S105 slag powders specific area>=500m
2/ kg, 7d activity index>=95%, 28d activity index>=105%, water content≤1.0wt%.
The present invention compared with prior art has following advantage:
(1) preparation method of a kind of ultrafine slag powder of the present invention, adopt two step polishings to be ground slag powders, in first step process of lapping, adopt steel ball and the steel column of specific grating, as the first abrasive media, slag powders is ground to 45 ~ 90min, after the first step is ground and finished, without the fine powder screening, directly in ball mill, continue to add the steel ball of special diameter as the second abrasive media, continue to grind 180 ~ 480min, can prepare ultrafine slag powder of the present invention.In preparation method of the present invention, after the powder that meets the specific area requirement obtained after having avoided in the prior art, a step being ground screens, continuing the undesirable slag powders of contrast table area at former ball mill is again ground, but creatively adopt two steps to grind, and by controlling the milling time of each step, simultaneously after a step is ground, the steel ball added in the slag powders of screening without fine powder carries out two step grindings, like this in ball mill due to the steel ball newly added and the specific area obtained after the first step is ground than the slag powders acting in conjunction of large (being that particle diameter is little) on the slag powders of specific area little (being that particle diameter is large), make the interaction force between the slag powders that slag powders that abrasive media and specific area are larger and specific area are less change, broken the dynamic equilibrium of normal " grinding-reunion " occurred in the prior art, thereby can prepare specific area, be 800 ~ 900m
2the ultrafine slag powder of/kg.The present invention has advantages of that the preparation method is simple, cost is low, applicable engineering application.
(2) preparation method of ultrafine slag powder of the present invention, further define the ratio of the addition of the first abrasive media and the second abrasive media, at described specific addition ratio, in mass, described the first abrasive media is (7 ~ 9) with described the second abrasive media addition ratio: when (1 ~ 3), and during the addition of further the controlling described slag powders 5 ~ 25wt% that is described the first abrasive media and the second abrasive media gross mass, the specific grating that coordinates described abrasive media, can further guarantee in process of lapping, slag powder can not reunited, thereby it is active high to make the slag powders prepared have, the advantage that specific area is large.
The specific embodiment
Below in conjunction with embodiment, the present invention is further described in detail, but is not limited to this.
If not the raw material used in embodiment refers in particular to, be known, commercially available industrial chemicals, be specially:
embodiment 1
The preparation method of the described ultrafine slag powder of the present embodiment, comprise the steps:
(1) the S95 slag powders of 6.4kg is mixed with the first abrasive media of 12kg, wherein, the steel ball that described the first abrasive media is 4kg, 3kg steel ball, 2kg steel ball, and 1kg steel column, 2kg the mixture of steel column; Grind 55min in ball mill;
(2) add 8kg the second abrasive media in described step (1), wherein said the second abrasive media is the steel ball that diameter is, continues to grind 390min, prepares ultrafine slag powder A of the present invention.
embodiment 2
The preparation method of the described ultrafine slag powder of the present embodiment, comprise the steps:
(1) the S75 slag powders of 4kg is mixed with the first abrasive media of 56kg, the steel ball of the steel ball that wherein said the first abrasive media is 28kg, the steel ball of 4kg, 20kg, the steel column of 1.6kg, 2.4kg the mixture of steel column, grind 45min in ball mill;
(2) to the second abrasive media that adds 24kg in described step (1), wherein said the second abrasive media is the steel ball that diameter is, continues to grind 480min, prepares ultrafine slag powder B of the present invention.
embodiment 3
The preparation method of the described ultrafine slag powder of the present embodiment, comprise the steps:
(1) the S105 slag powders of 5kg is mixed with the first abrasive media of 16kg, the steel ball of the steel ball that wherein said the first abrasive media is 6kg, the steel ball of 2kg, 2kg, the steel column of 2.6kg, 3.4kg the mixture of steel column, grind 60min in ball mill;
(2) to the second abrasive media that adds 4kg in described step (1), wherein said the second abrasive media is the steel ball that diameter is, continues to grind 300min, prepares ultrafine slag powder C of the present invention.
embodiment 4
The preparation method of the described ultrafine slag powder of the present embodiment, comprise the steps:
(1) the S95 slag powders of 6kg is mixed with the first abrasive media of 36kg, the steel ball of the steel ball that wherein said the first abrasive media is 8kg, the steel ball of 6kg, 8kg, the steel column of 6kg, 8kg the mixture of steel column, grind 90min in ball mill;
(2) to the second abrasive media that adds 4kg in described step (1), wherein said the second abrasive media is the steel ball that diameter is, continues to grind 180min, prepares ultrafine slag powder D of the present invention.
comparative Examples
(1) blast-furnace cinder of 200kg is dried and is less than or equal to 0.6wt% to moisture under 105 ℃ of conditions;
(2) blast-furnace slag after drying is ground with Vertical Mill;
(3) select specific area with impulse bag type dust collector and be greater than 430m
2the fine powder of/kg, specific area is less than 430m
2the meal of/kg returns to Vertical Mill to be continued to grind;
(4) select specific area and be greater than 430m
2the fine powder of/kg carries out fine grinding with the three-ring type roll mill, and obtaining specific area is 800 ~ 2000m
2/ kg, average grain diameter is less than or equal to the ultrafine slag powder of 4 μ m;
(5) by collector, collected, products obtained therefrom is ultrafine slag powder.
the performance measurement evaluation Example
Get ultrafine slag powder A～D and Comparative Examples that above-described embodiment 1 to 4 prepares, carry out the performance test of density, specific area, 7d activity index, 28d activity index, fluidity ratio, moisture content, sulfur trioxide, chlorion and loss on ignition, test result is as shown in table 1:
The performance test results of table 1 ultrafine slag powder
From above-described embodiment and table 1, the specific surface of ultrafine slag powder of the present invention can be up to 868m
2/ kg, 7d activity index>=115%, 28d activity index>=125%, have the high activity characteristic.
Obviously, above-described embodiment is only for example clearly is described, and is not the restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments, and the apparent variation of being extended out thus or change are still among the protection domain in the invention claim.
Claims (8)
1. the preparation method of a ultrafine slag powder, comprise the steps:
(1) slag powders is mixed with the first abrasive media, grind 45 ~ 90min in ball mill;
(2) add the second abrasive media in the material after described step (1) is ground, continue to grind 180 ~ 480min, prepare ultrafine slag powder of the present invention;
Wherein, described the first abrasive media is the steel ball that diameter is 60mm, 40mm, 20mm, and the mixture of the diameter steel column that is 20 mm, 10mm;
Described the second abrasive media is the steel ball that diameter is 20mm.
2. the preparation method of ultrafine slag powder according to claim 1, is characterized in that, in mass, described the first abrasive media with described the second abrasive media addition than being (7 ~ 9): (1 ~ 3).
3. according to the preparation method of claim 1 or 2 described ultrafine slag powder, it is characterized in that, in the quality of the first abrasive media, the steel ball of described 60mm is (20 ~ 35) with the addition ratio of the steel column of the steel ball of the steel ball of described 40mm, described 20mm, the steel column of described 20 mm, described 10mm: (5 ~ 15): (10 ~ 25): (2 ~ 15): (3 ~ 20).
4. according to the preparation method of claim 1 or 2 or 3 described ultrafine slag powders, it is characterized in that, in described the first abrasive media and described the second abrasive media gross mass, the addition of described slag powders is 5 ~ 25wt%.
5. according to the preparation method of the arbitrary described ultrafine slag powder of claim 1 ~ 4, it is characterized in that, described slag powders is S75 grade slag powder, S95 grade slag powder or S105 grade slag powder.
6. the preparation method of ultrafine slag powder according to claim 5, is characterized in that the specific area>=300m of described S75 slag powders
2/ kg, 7d activity index>=55%, 28d activity index>=75%, water content≤1.0wt%.
7. the preparation method of ultrafine slag powder according to claim 5, is characterized in that S95 slag powders specific area >=400m2/kg, 7d activity index >=75%, 28d activity index >=95%, water content≤1.0wt%.
8. the preparation method of ultrafine slag powder according to claim 5, is characterized in that S105 slag powders specific area>=500m
2/ kg, 7d activity index>=95%, 28d activity index>=105%, water content≤1.0wt%.
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| CN201310047639.0A CN103170393B (en) | 2012-12-28 | 2013-02-06 | Preparation method of superfine slag powder |
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| CN201210582219 | 2012-12-28 | ||
| CN201210582219.8 | 2012-12-28 | ||
| CN201310047639.0A CN103170393B (en) | 2012-12-28 | 2013-02-06 | Preparation method of superfine slag powder |
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Cited By (6)
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| CN103846130A (en) * | 2014-03-12 | 2014-06-11 | 瓮福（集团）有限责任公司 | Ore grinding method |
| CN104258943A (en) * | 2014-09-04 | 2015-01-07 | 河南东大矿业股份有限公司 | Ball mill steel ball and steel forging match grinding and filling ball selection method |
| CN109250930A (en) * | 2018-11-14 | 2019-01-22 | 韶关学院 | A method of improving low-grade ore ground-slag gelation activity |
| CN110152855A (en) * | 2019-05-11 | 2019-08-23 | 贵州日恒资源利用有限公司 | A kind of blast-furnace cinder flour producing process |
| CN110590208A (en) * | 2019-08-29 | 2019-12-20 | 广东清大同科环保技术有限公司 | Preparation method of white slag admixture |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104258943A (en) * | 2014-09-04 | 2015-01-07 | 河南东大矿业股份有限公司 | Ball mill steel ball and steel forging match grinding and filling ball selection method |
| CN104258943B (en) * | 2014-09-04 | 2016-12-07 | 河南东大矿业股份有限公司 | A kind of ball mill steel ball and steel forging match grinding by-election ball method |
| CN109250930A (en) * | 2018-11-14 | 2019-01-22 | 韶关学院 | A method of improving low-grade ore ground-slag gelation activity |
| CN109250930B (en) * | 2018-11-14 | 2021-03-30 | 韶关学院 | Method for improving gelling activity of low-grade slag powder |
| CN110152855A (en) * | 2019-05-11 | 2019-08-23 | 贵州日恒资源利用有限公司 | A kind of blast-furnace cinder flour producing process |
| CN110152855B (en) * | 2019-05-11 | 2022-06-28 | 贵州日恒资源利用有限公司 | Blast furnace slag powder processing technology |
| CN110590208A (en) * | 2019-08-29 | 2019-12-20 | 广东清大同科环保技术有限公司 | Preparation method of white slag admixture |
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