CN103170393B - Preparation method of superfine slag powder - Google Patents
Preparation method of superfine slag powder Download PDFInfo
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- CN103170393B CN103170393B CN201310047639.0A CN201310047639A CN103170393B CN 103170393 B CN103170393 B CN 103170393B CN 201310047639 A CN201310047639 A CN 201310047639A CN 103170393 B CN103170393 B CN 103170393B
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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 primary solids discarded object of ferrous metals industry, has higher lateral reactivity.At present, its levigate slag powders that is prepared into, except in order to except operating mine slag cement, also can use as concrete admixture by slag.When slag powders uses as concrete admixture, not only cement consumption can be saved, reduce concrete cost, the submicroscopic structure in concrete can be improved simultaneously, reduce the concrete heat of hydration and improve the performances such as the mobility of concrete construction, workability and pumpability.One of basic demand when slag powders uses as concrete admixture to have enough large specific area, because specific area is higher, its activity index is higher, and the high reaction speed can accelerating cement of activity index, thus greatly can improve cement and concrete early strength.
In the architectural engineering application of China, to the grinding of slag powders, one adopts conventional bead mill to carry out, because ball mill has an inventory greatly, the advantage that equipment cost is low, is applicable to engineer applied.But, ball mill is in slag powders process of lapping, because inventory is large, there is the problem that residence time of material is long, when especially preparing super finely ground slag, specific area required by ultrafine slag powder to be prepared is larger, need the time of grinding longer, and residence time of material length can cause the dynamic equilibrium occurring " grinding-reunion " in process of lapping.This is mainly because when material grinds in ball mill, and after its specific area increases, specific surface energy also increases; thus, subparticle can be assembled mutually, in this state; even if extend milling time again, material also difficulty grinds thinner, and particle sometimes even can be made thicker.Due to the existence of the problems referred to above, the specific area through the material of ball mill grinding focuses mostly at 360 ~ 430m
2/ kg.And in order to avoid the dynamic equilibrium of " grinding-reunion ", in prior art, after a step grinding being carried out to slag powders in ball mill, be all 360 ~ 430m by satisfactory specific area usually
2the slag powders of/kg is separated removing after selecting powder, and the less namely slag powders that particle diameter is larger of remaining specific area continues to grind 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 one utilize Vertical Mill and roll mill combine 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 large, the active high advantage of fineness.Its preparation method comprises (1) dries moisture≤0.6wt% by blast-furnace slag under 105 DEG C of conditions; (2) the blast-furnace slag Vertical Mill after oven dry is ground; (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 Vertical Mill and continues grinding; (4) select specific area and be greater than 430m
2the fine powder three-ring type roll mill of/kg carries out fine grinding, and obtaining specific area is 800 ~ 2000m
2/ kg, the super-active slag powder of average grain diameter≤4 micron; (5) collected by collector, products obtained therefrom is super-active slag powder.
Above-mentioned technology carries out preliminary grinding mainly through Vertical Mill to slag, obtains specific area and is greater than 430m
2after the fine powder of/kg, then with three-ring type roll mill, fine grinding is carried out to this fine powder and can prepare super-active slag powder.In above-mentioned process of lapping, because Vertical Mill and roll mill have the simple and advantage that inventory is few of flow process, thus make material time of staying in mill short, and the particle after grinding can not be reunited at short notice, thus can to prepare specific area be 800 ~ 2000m
2the super-active slag powder of/kg.But in above-mentioned technology, owing to selecting Vertical Mill and three-ring type roll mill two kinds of milling apparatus, slag is ground, few and the problem of equipment price costliness of the single treatment amount that there is slag powders, thus cause the preparation cost of super-active slag powder high, and then make ultrafine slag powder limited in the engineer applied of reality.And how to use ball mill to grind slag to obtain the super-active slag micro mist that preparation cost is low, be suitable for commercial Application, be 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 still to utilize ball mill to carry out the preparation of ultrafine slag powder in prior art, and then provide a kind of method utilizing ball mill to prepare ultrafine slag powder.
In order to solve the problems of the technologies described above, the invention provides a kind of preparation method of ultrafine slag powder, comprising the steps:
(1) slag powders is mixed with the first abrasive media, in ball mill, grind 45 ~ 90min;
(2) in the material after described step (1) grinding, add the second abrasive media, continue grinding 180 ~ 480min, namely prepare ultrafine slag powder of the present invention;
Wherein, to be diameter be described first abrasive media
steel ball, and diameter is
the mixture of steel column;
Described second abrasive media is diameter
steel ball.
In mass, described first abrasive media and described second abrasive media addition are than being (7 ~ 9): (1 ~ 3).
In the quality of the first abrasive media, described in
steel ball and described
steel ball, described in
steel ball, described in
steel column, described in
the addition of steel column than for (20 ~ 35): (5 ~ 15): (10 ~ 25): (2 ~ 15): (3 ~ 20).
In described first abrasive media and described 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 tool has the following advantages:
(1) preparation method of a kind of ultrafine slag powder of the present invention, two step polishings are adopted to grind slag powders, in first step process of lapping, the steel ball of specific grating and steel column is adopted to carry out grinding 45 ~ 90min as the first abrasive media to slag powders, after first step grinding terminates, without fine powder screening, in ball mill, directly continue to add the steel ball of special diameter as the second abrasive media, continue grinding 180 ~ 480min, ultrafine slag powder of the present invention can be prepared.In preparation method of the present invention, avoid after the powder meeting specific area requirement obtained after a step grinding being screened in prior art, continue the undesirable slag powders of contrast table area at protocorm grinding machine again to grind, but creatively adopt two step grindings, and by controlling the milling time of each step, simultaneously after a step grinding, add in the slag powders of fine powder screening
steel ball carry out two step grindings, like this in ball mill due to the steel ball that newly adds and the specific area obtained after the first step grind compared with the slag powders acting in conjunction of (namely particle diameter is little) greatly in the slag powders of specific area little (namely particle diameter is large), interaction force between the less slag powders of abrasive media and the larger slag powders of specific area and specific area is changed, to have broken in prior art the dynamic equilibrium of normal " grinding-reunion " that occur, thus can to prepare specific area be 800 ~ 900m
2the ultrafine slag powder of/kg.The present invention has the advantage that preparation method is simple, cost is low, is suitable for engineer applied.
(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, namely in mass, described first abrasive media is (7 ~ 9) with described second abrasive media addition ratio: time (1 ~ 3), and the addition controlling further described slag powders is when being 5 ~ 25wt% of described first abrasive media and the second abrasive media gross mass, coordinate the specific grating of described abrasive media, can ensure in process of lapping further, slag powder can not be reunited, thus it is active high to make the slag powders prepared have, the advantage that specific area is large.
Detailed description of the invention
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 ultrafine slag powder described in the present embodiment, comprises the steps:
(1) the S95 slag powders of 6.4kg mixed with first abrasive media of 12kg, wherein, described first abrasive media is 4kg's
steel ball, 3kg
steel ball, 2kg
steel ball, and 1kg
steel column, 2kg
the mixture of steel column; 55min is ground in ball mill;
(2) in described step (1), add 8kg second abrasive media, to be diameter be wherein said second abrasive media
steel ball, continue grinding 390min, namely prepare ultrafine slag powder A of the present invention.
embodiment 2
The preparation method of ultrafine slag powder described in the present embodiment, comprises the steps:
(1) the S75 slag powders of 4kg mixed with first abrasive media of 56kg, wherein said first abrasive media is 28kg's
steel ball, 4kg's
steel ball, 20kg's
steel ball, 1.6kg's
steel column, 2.4kg's
the mixture of steel column, in ball mill, grind 45min;
(2) in described step (1), add second abrasive media of 24kg, to be diameter be wherein said second abrasive media
steel ball, continue grinding 480min, namely prepare ultrafine slag powder B of the present invention.
embodiment 3
The preparation method of ultrafine slag powder described in the present embodiment, comprises the steps:
(1) the S105 slag powders of 5kg mixed with first abrasive media of 16kg, wherein said first abrasive media is 6kg's
steel ball, 2kg's
steel ball, 2kg's
steel ball, 2.6kg's
steel column, 3.4kg's
the mixture of steel column, in ball mill, grind 60min;
(2) in described step (1), add second abrasive media of 4kg, to be diameter be wherein said second abrasive media
steel ball, continue grinding 300min, namely prepare ultrafine slag powder C of the present invention.
embodiment 4
The preparation method of ultrafine slag powder described in the present embodiment, comprises the steps:
(1) the S95 slag powders of 6kg mixed with first abrasive media of 36kg, wherein said first abrasive media is 8kg's
steel ball, 6kg's
steel ball, 8kg's
steel ball, 6kg's
steel column, 8kg's
the mixture of steel column, in ball mill, grind 90min;
(2) in described step (1), add second abrasive media of 4kg, to be diameter be wherein said second abrasive media
steel ball, continue grinding 180min, namely prepare ultrafine slag powder D of the present invention.
comparative example
(1) blast-furnace cinder of 200kg is dried under 105 DEG C of conditions be less than or equal to 0.6wt% to moisture;
(2) the blast-furnace slag Vertical Mill after oven dry is ground;
(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 Vertical Mill and continues grinding;
(4) select specific area and be greater than 430m
2the fine powder three-ring type roll mill of/kg carries out fine grinding, and obtaining specific area is 800 ~ 2000m
2/ kg, average grain diameter is less than or equal to the ultrafine slag powder of 4 μm;
(5) collected by collector, products obtained therefrom is ultrafine slag powder.
performance measurement evaluation Example
Get ultrafine slag powder A ~ D and comparative example 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 up to 868m
2/ kg, 7d activity index>=115%, 28d activity index>=125%, has high activity characteristic.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not 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 the need to also giving all embodiments, and thus the apparent change of extending out or variation be still among the protection domain of the invention claim.
Claims (8)
1. a preparation method for ultrafine slag powder, comprises the steps:
(1) slag powders is mixed with the first abrasive media, in ball mill, grind 45 ~ 90min;
(2) in the material after described step (1) grinding, add the second abrasive media, continue grinding 180 ~ 480min, namely prepare ultrafine slag powder of the present invention;
Wherein, the steel ball of described first abrasive media to be diameter be 60mm, 40mm, 20mm, and diameter is the mixture of the steel column of 20 mm, 10mm;
The steel ball of described second abrasive media to be diameter be 20mm.
2. the preparation method of ultrafine slag powder according to claim 1, is characterized in that, in mass, described first abrasive media and described second abrasive media addition are than being (7 ~ 9): (1 ~ 3).
3. the preparation method of ultrafine slag powder according to claim 1 or 2, it is characterized in that, in the quality of the first abrasive media, the addition of the steel ball of the steel ball of described 60mm and the steel ball of described 40mm, described 20mm, the steel column of described 20 mm, the steel column of described 10mm is than being (20 ~ 35): (5 ~ 15): (10 ~ 25): (2 ~ 15): (3 ~ 20).
4. the preparation method of ultrafine slag powder according to claim 3, it is characterized in that, in described first abrasive media and described second abrasive media gross mass, the addition of described slag powders is 5 ~ 25wt%.
5. the preparation method of ultrafine slag powder according to claim 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 grade slag powder
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 grade slag powder specific area>=400m
2/ 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 grade slag powder 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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| CN201210582219.8 | 2012-12-28 | ||
| CN201210582219 | 2012-12-28 | ||
| CN201310047639.0A CN103170393B (en) | 2012-12-28 | 2013-02-06 | Preparation method of superfine slag powder |
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| CN103170393B true CN103170393B (en) | 2015-04-29 |
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| CN103611618A (en) * | 2013-12-06 | 2014-03-05 | 中南大学 | Control method for grinding ores in stages |
| CN103846130B (en) * | 2014-03-12 | 2015-12-02 | 瓮福（集团）有限责任公司 | A kind of milling 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 |
| CN109250930B (en) * | 2018-11-14 | 2021-03-30 | 韶关学院 | Method for improving gelling activity of low-grade slag powder |
| 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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| JP3165631B2 (en) * | 1995-12-21 | 2001-05-14 | 三菱重工業株式会社 | Horizontal ultra-fine grinding mill |
| CN100478076C (en) * | 2007-03-30 | 2009-04-15 | 昆明理工大学 | The method of accurate loading-and-filling ball of two sections of milling mine |
| CN101722085B (en) * | 2008-10-15 | 2012-06-13 | 许兴康 | Grinding technology of high purity sub-nano level superfine zirconium silicate powder |
| CN101745447B (en) * | 2008-12-19 | 2012-01-11 | 鞍钢矿山建设有限公司 | Once-grinding double-use production method which not only can be used for producing concrete, but also can be used for grinding slag ultrafine powder |
| CN102101069B (en) * | 2009-12-17 | 2012-05-23 | 鞍钢集团矿业公司 | Novel method for proportioning ore grinding media |
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Address after: 101119 Guantou Village, Songzhuang Town, Tongzhou District, Beijing Patentee after: Beijing Zhonglian Xinhang building materials Co.,Ltd. Address before: 101119 Guantou Village, Songzhuang Town, Tongzhou District, Beijing Patentee before: BEIJING NEW VOYAGING CO.,LTD. |