CN103575625A - Method for measuring content and particle size distribution of magnetic iron in steel slag - Google Patents
Method for measuring content and particle size distribution of magnetic iron in steel slag Download PDFInfo
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- CN103575625A CN103575625A CN201310451413.7A CN201310451413A CN103575625A CN 103575625 A CN103575625 A CN 103575625A CN 201310451413 A CN201310451413 A CN 201310451413A CN 103575625 A CN103575625 A CN 103575625A
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Abstract
The invention discloses a method for measuring content and particle size distribution of magnetic iron in steel slag. The method comprises the following steps of: performing grading and magnetic separation for the steel slag according to the particle sizes of 10mm, 5mm, 1mm and 0.25mm, and by taking the magnetic separation tails of which the particle size is less than 0.25mm as comparative reference, measuring content of magnetic iron in fine slag of each particle size grade through a specific gravity method, thereby obtaining content and particle size distribution of magnetic iron in steel slag. The method has the characteristics of accurate measurement, wide application range and low measuring cost, and needs no empirical formula. The method is especially suitable for magnetic iron grade measurement of metallic iron recycled by steel slag magnetic separation, and technology setting of graded magnetic separation production, has stronger promotional value, and is beneficial for steel slag resource recycling.
Description
Technical field
The present invention relates to slag and reclaim field, specifically steel scoria magnetic separation reclaims.
Background technology
One ton of steel of every production is by the slag that produces 15～20%, and in slag, contain 5～15% metallic iron and part magnetic oxide, therefore to the recycling of the metallic iron in slag and magnetic oxide, can not only reduce iron and steel enterprise's cost creates good economic benefit, and rationally utilize limited mineral wealth, ecological, environmental protective is all significant.But slag is because hardness is high, and slag is separated with iron more difficult, thus the magnetic separation process of slag comparatively complexity also exist some difficult problems.As the Armco magnetic iron grade in slag and magnetic concentrate directly has influence on the value of slag and utilizes approach; And the particle diameter distribution of magnetic separation iron directly has influence on the selection of steel scoria magnetic separation technique, all many-sides such as optimization of the setting of classification magnetic separation process hierarchy plan, magnetic separation process magnetic field intensity in slag.
The mensuration aspect of slag Armco magnetic iron content mainly contains " iron chloride-dichromate method " at present, but the method samples less, is only 0.5g, and each composition of slag is evenly distributed with to requirement, and low-grade small particle diameter slag metallic iron is measured and had better effects.National standard YBT4188-2009---magnetic metal Methods For The Determination of Iron > > in < < slag in addition, but because the separation of slag slag iron is more difficult, the simple magnetic separation iron content that adopts magnetic separation process to be difficult to accurately obtain slag, result is bigger than normal.The iron product position detecting method > > of patent of invention < < slag iron discloses a kind of detection method to slag iron, but it is only for the iron grade of slag iron, and the calculating formula that sees service, usage range is narrower.
For metallic iron particle diameter in slag, distribute and have no report, the grindability of slag is mainly paid close attention in the setting of steel scoria magnetic separation technique, magnetic field intensity, and be concerned about very micro-to the particle diameter distribution of Armco magnetic iron in slag (metallic iron).And the distribution of the particle diameter of magnetic separation iron is the Important Economic technical indicator of taking which kind of classification magnetic separation and grinding technics in slag, be directly connected to the efficiency of steel scoria magnetic separation and the abrasion condition of equipment.The bottleneck that steel scoria magnetic separation runs into is at present different slag processing adaptability wideless, and equipment attrition is serious, and the mensuration distributing by slag Armco magnetic iron particle diameter very can address these problems effectively.
Therefore, the mensuration that the improvement of measuring by steel scoria magnetic separation iron content for above problem and Armco magnetic iron particle diameter distribute can be worth the magnetic separation of slag, and the magnetic separation process setting of slag and the efficiency of steel scoria magnetic separation technique etc. effectively instruct and demarcates.
Summary of the invention
The slag Armco magnetic iron content assaying method that the object of this invention is to provide the industrial requirements of recycling for slag.
For realizing the technical scheme that the object of the invention adopts, be such, a kind ofly measure the method that Armco magnetic iron content in slag and particle diameter thereof distribute, comprise the following steps:
1) fragmentation: the slag crushing after certain a collection of coming out of the stove is processed;
2) sampling: take out at least a sample from the slag after step 1) break process, the weight of a duplicate samples is M, and unit is g;
3) duplicate samples screening: get step 2) obtaining is sieved processing, by particle size, this duplicate samples is divided into five parts, is labeled as respectively sample I, sample II, sample III, sample IV and sample V, and its weight is respectively: M
1, M
2, M
3, M
4and M
5, unit is g;
4) magnetic separation: sample I, sample II, sample III, sample IV and sample V are carried out to magnetic separation, after magnetic separation, obtain five parts of Magnetic Materials and five parts of mine tailings,
Described five parts of Magnetic Materials are Magnetic Materials I, Magnetic Materials II, Magnetic Materials III, Magnetic Materials IV, Magnetic Materials V, and its density is respectively: ρ
1, ρ
2, ρ
3, ρ
4and ρ
5, unit is g/cm
3,
Described five parts of mine tailings are mine tailing I, mine tailing II, mine tailing III, mine tailing IV, mine tailing V;
5) ball milling: be milled to 60 orders after five parts of mine tailings that step 4) is obtained mix;
6) magnetic separation again: to being milled to 60 object mine tailings in step 5), carry out magnetic separation, obtain Magnetic Materials VI and mine tailing VI,, the density of described Magnetic Materials VI is ρ
6, the density of described mine tailing VI is ρ
s, 7) and the content of the iron that can be magneticly elected in sample I～V: W
i=ρ
f(ρ
i-ρ
s)/ρ i (ρ
f-ρ
s), i=1,2 ... 6, in formula: ρ
ffor metallic iron density, value is 7.86g/cm
3; ρ
ifor the density of described Magnetic Materials I～VI, i=1,2 ... 6;
8) calculate the content of the iron that can be magneticly elected in this collection of slag: w
fe=Σ (W
i* M
i/ M) * 100%, in formula: i=1,2 ... 5;
9) particle diameter of the iron that can be magneticly elected in this collection of slag distributes and calculates as follows: q
i=W
i* M
i/ M * 100%, in formula:
i=
1,
2......
5.
Compared to existing technology, the present invention has following beneficial effect:
1, the present invention has the mensuration that combines ferromagnetic assay in slag and different-grain diameter magnetic separation iron content of novelty.Technical ability is demarcated Armco magnetic iron content in slag can instruct steel scoria magnetic separation technique initialization again, to reduce equipment attrition and energy consumption.
2, usable range of the present invention is wide, wide to the particle diameter of slag, Armco magnetic iron taste usable range, is specially adapted to steel scoria magnetic separation industrial applicability.
3, the present invention does not adopt experimental formula, to variety classes slag, can carry out direct sample mensuration.
4, the present invention tests simply, and testing cost is low.
Adopt in sum such scheme, can reclaim industry for steel scoria magnetic separation and effectively demarcate the magnetic separation iron content in slag, effectively formulate rational steel scoria magnetic separation processing line.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but should not be construed the above-mentioned subject area of the present invention, only limits to following embodiment.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and customary means, make various replacements and change, all should be included in protection scope of the present invention.
Embodiment 1:
In the present embodiment, a collection of slag to southwest steelworks is studied.Comprise the following steps:
1) fragmentation: the slag crushing after certain a collection of coming out of the stove is processed.Used in this step is the conventional mining industry disintegrating machine in this area, and its power (broken dynamics) and broken time can be adjusted as required.
2) sampling: take out the sample that some parts of weight are 2003.1g from the slag after step 1) break process.
3) duplicate samples screening: get step 2) obtaining is sieved processing, by particle size, this duplicate samples is divided into five parts, the present embodiment can according to [10 ,+∞), [5,10), [1,5), [0.25,1), (∞, 0.25) five interval ranges sieve (unit is mm), be labeled as respectively sample I, sample II, sample III, sample IV and sample V, its weight is respectively: M
1=1352.1g, M
2=224.3g, M
3=179.9g, M
4=205.3g and M
5=41.5g.4) magnetic separation: sample I, sample II, sample III, sample IV and sample V are carried out to magnetic separation, after magnetic separation, obtain five parts of Magnetic Materials and five parts of mine tailings,
Described five parts of Magnetic Materials are Magnetic Materials I, Magnetic Materials II, Magnetic Materials III, Magnetic Materials IV, Magnetic Materials V, and its density is respectively: ρ
1=5.24g/cm
3, ρ
2=4.98/cm
3, ρ
3=4.53g/cm
3, ρ
4=5.30g/cm
3, ρ
5=3.57g/cm
3.
Described five parts of mine tailings are mine tailing I, mine tailing II, mine tailing III, mine tailing IV, mine tailing V;
5) ball milling: be milled to 60 orders after five parts of mine tailings that step 4) is obtained mix;
6) magnetic separation again: carry out magnetic separation to being milled to 60 object mine tailings in step 5), obtain Magnetic Materials VI and mine tailing VI, ρ
6=3.56g/cm
3, the density of described mine tailing VI is ρ
s=3.12g/cm
3, 7) and the content of the iron that can be magneticly elected in sample I～VI: W
i=ρ
f(ρ
i-ρ
s)/ρ
i(ρ
f-ρ
s), i=1,2 ... 5, in formula: ρ
ffor metallic iron density, value is 7.86g/cm
3; ρ i is the density of described Magnetic Materials I～VI, i=1,2 ... 6;
Through calculating, W
1=67.11%, W
2=61.72%, W
3=51.35%, W
4=68.12%, W
5=20.48%, W
6=20.69.
8) calculate the content (metallic iron accounts for the number percent of slag general assembly (TW)) of the iron that can be magneticly elected in this collection of slag:
W
fe=Σ (W
i* M
i/ M) * 100%=45.49%, in formula: i=1,2 ... 6;
9) particle diameter of the iron that can be magneticly elected in this collection of slag distributes and calculates as follows: q
i=W
i* M
i/ M * 100%, in formula: i=1,2 ... 6,
As calculated, q
1=20.00%, q
2=3.91%, q
3=3.24%, q
4=15.05%, q
5=0.13%, q
6=3.16%.
Embodiment 2
Described in the open Application Example 1 of the present embodiment, measure the method that method that Armco magnetic iron content in slag and particle diameter thereof distribute improves steel scoria magnetic separation process economy.The present embodiment adopts embodiment 1 equipment used, object with embodiment 1.Just, in step 1), record power and the broken time of using of disintegrating apparatus;
Step 2) in, the umber that takes out described sample is two parts, and portion is wherein sample described in step 3), and another part is sample as a comparison; By x-ray analysis or chemical analysis, measure the content w=46.63% of metallic iron in described control sample.
After step 9) has been carried out, carry out following steps:
In step 10), calculate described w and w
fethe absolute value u=1.14% of difference.
Step 11), in the present embodiment, needs setting threshold I=3% and threshold value II=0.5%, and wherein threshold value I is greater than threshold value II.
If u is greater than threshold value I, show that slag magnetic separation is not thorough, need to increase broken dynamics, this batch of slag fragmentation is more thorough.Now, repeating step 1～11, but in step 1), need to increase the power of disintegrating apparatus or increase the broken time.
If u is less than threshold value II, show that slag magnetic separation is thorough, but crushing force spends greatly, uneconomical.Repeating step 1～11, but in step 1), need to reduce the power of disintegrating apparatus or reduce the broken time.
If u between threshold value I and threshold value II, end operation.Found suitable broken dynamics, after this, the magnetic separation of this batch of slag is all carried out according to this standard.
Embodiment 3:
Described in the present embodiment Application Example 1, measure the method for the evaluation that method that Armco magnetic iron content in slag and particle diameter thereof distribute is worth steel slag utilization.The present embodiment is accepted embodiment 2, just in step 11):
If u is greater than threshold value I, show that slag magnetic separation is not thorough, need to increase broken dynamics, this batch of slag fragmentation is more thorough.Now, repeating step 1～11, but in step 1), by increasing the power of disintegrating apparatus, increase broken dynamics, used is the common adjustable crusher in this area.
If adjustable crusher reaches peak power (broken dynamics is transferred to maximum), through calculating u value, be still greater than threshold value I, show that this collection of slag is difficult to reclaim by magnetic separation, should abandon the magnetic separation of this collection of slag.
Embodiment 4:
The present embodiment discloses and measures the method that method that Armco magnetic iron content in slag and particle diameter thereof distribute improves steel scoria magnetic separation process economy described in another kind of Application Example 1.The present embodiment is accepted embodiment 1, in the present embodiment, the particle diameter of the iron that can be magneticly elected in this collection of slag is analyzed.
According to the 9th of embodiment 1 the) the particle diameter distribution q of the iron that can be magneticly elected in this collection of slag
i(be q
1=20.00%, q
2=3.91%, q
3=3.24%, q
4=15.05%,, q5=0.13%, q6=3.16%, q
w=q
5+ q
6=3.29%).When the industrialization magnetic separation to this batch of slag, first this batch of slag carried out to fragmentation, if q
i(i=1,2 ... 5) be greater than 5%, filter out q
ithe slag of corresponding particle diameter again broken, and then carry out magnetic separation.Particularly, in the present embodiment, it is [10 that a middle maximum part for the iron that can be magneticly elected is distributed in particle diameter, + ∞) in (being broken) slag, a part for next of the iron that can be magneticly elected be distributed in particle diameter for [0.25,1) (being broken) slag in, the q of this two parts particle diameter
ivalue is all greater than 5%.According to this result, obtain the micro Distribution situation of magnetic separation rate, for the working method of disintegrating apparatus provides guidance.When this batch of slag carried out to magnetic separation, slag is carried out after fragmentation, filter out particle diameter for [10 ,+∞) and particle diameter be [0.25,1) slag carry out again fragmentation, carry out again afterwards magnetic separation, can improve the efficiency of magnetic separation.
Claims (6)
1. a method of measuring Armco magnetic iron content in slag, is characterized in that, comprises the following steps:
1) fragmentation: the slag crushing after certain a collection of coming out of the stove is processed;
2) sampling: take out at least a sample from the slag after step 1) break process, the weight of a duplicate samples is M, and unit is g;
3) duplicate samples screening: get step 2) obtaining is sieved processing, by particle size, this duplicate samples is divided into five parts, is labeled as respectively sample I, sample II, sample III, sample IV and sample V, and its weight is respectively: M
1, M
2, M
3, M
4and M
5, unit is g;
4) magnetic separation: sample I, sample II, sample III, sample IV and sample V are carried out to magnetic separation, after magnetic separation, obtain five parts of Magnetic Materials and five parts of mine tailings, described five parts of Magnetic Materials are Magnetic Materials I, Magnetic Materials II, Magnetic Materials III, Magnetic Materials IV, Magnetic Materials V, and its density is respectively: ρ
1, ρ
2, ρ
3, ρ
4and ρ
5, unit is g/cm
3,
Described five parts of mine tailings are mine tailing I, mine tailing II, mine tailing III, mine tailing IV, mine tailing V;
5) ball milling: be milled to 60 orders after five parts of mine tailings that step 4) is obtained mix;
6) magnetic separation again: to being milled to 60 object mine tailings in step 5), carry out magnetic separation, obtain Magnetic Materials VI and mine tailing VI,, the density of described Magnetic Materials VI is ρ
6, the density of described mine tailing VI is ρ
s,
7) content of the iron that can be magneticly elected in sample I～V: W
i=ρ
f(ρ
i-ρ
s)/ρ i (ρ
f-ρ
s), i=1,2 ... 6, in formula: ρ
ffor metallic iron density, value is 7.86g/cm
3; ρ
ifor the density of described Magnetic Materials I～VI, i=1,2 ... 6;
8) calculate the content of the iron that can be magneticly elected in this collection of slag:
W
fe=Σ (W
i* M
i/ M) * 100%, in formula: i=1,2 ... 6.
2. Armco magnetic iron content method in mensuration slag according to claim 1, it is characterized in that: by sieving in step 3): the particle diameter of sample I is more than or equal to 10mm, the particle diameter of sample II is less than 10mm and is not more than 5mm, the particle diameter of sample III is less than 5mm and is not more than 1mm, the particle diameter of sample IV is less than 1mm and is not more than 0.25mm, and the particle diameter of sample V is less than 0.25mm.
3. measure the method that in slag, Armco magnetic iron particle diameter distributes, it is characterized in that: the step 8 in claim 1 or 2 carry out step 9 after finishing,
That is: the particle diameter of the iron that 9) can be magneticly elected in this collection of slag distributes and calculates as follows: q
i=W
i* M
i/ M * 100%, in formula: i=1,2 ... 6.
4. the method for measuring Armco magnetic iron content in slag described in application rights requirement 1 or 2 improves the method for steel scoria magnetic separation process economy.
5. application rights requires to measure described in 1 or 2 the method for the evaluation that method that in slag, Armco magnetic iron particle diameter distributes is worth steel slag utilization.
6. application rights requires to measure described in 3 the method for the method raising steel scoria magnetic separation process economy that in slag, Armco magnetic iron particle diameter distributes.
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| CN105372154A (en) * | 2015-11-24 | 2016-03-02 | 中冶节能环保有限责任公司 | Method for measuring metallic iron content in steel slag |
| CN107227405A (en) * | 2017-05-04 | 2017-10-03 | 江苏省冶金设计院有限公司 | The method for correcting degree of dissociation |
| CN107367436A (en) * | 2017-06-14 | 2017-11-21 | 宝钢集团新疆八钢铁有限公司 | A kind of method for determining slag iron-holder |
| CN108169053A (en) * | 2017-12-16 | 2018-06-15 | 芜湖新兴铸管有限责任公司 | A kind of slag all iron content detection method |
| CN108918356A (en) * | 2018-05-18 | 2018-11-30 | 中建材（合肥）粉体科技装备有限公司 | A kind of mixed material squeezes smashed granularity prediction technique and system |
| CN109046760A (en) * | 2018-09-26 | 2018-12-21 | 攀钢集团攀枝花钢铁研究院有限公司 | The recoverying and utilizing method of vanadium titano-magnetite tailing |
| CN112098505A (en) * | 2020-08-19 | 2020-12-18 | 安徽金安矿业有限公司 | Method for determining magnetic iron content of tailings by utilizing magnetic susceptibility principle |
| CN113466079A (en) * | 2021-06-30 | 2021-10-01 | 重庆钢铁股份有限公司 | Method for detecting component content of steel slag |
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| CN105259084A (en) * | 2015-10-26 | 2016-01-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for detecting components and particle size range of unreacted materials after titanium slag fused salt chlorination |
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| CN105372154A (en) * | 2015-11-24 | 2016-03-02 | 中冶节能环保有限责任公司 | Method for measuring metallic iron content in steel slag |
| CN107227405A (en) * | 2017-05-04 | 2017-10-03 | 江苏省冶金设计院有限公司 | The method for correcting degree of dissociation |
| CN107367436A (en) * | 2017-06-14 | 2017-11-21 | 宝钢集团新疆八钢铁有限公司 | A kind of method for determining slag iron-holder |
| CN108169053A (en) * | 2017-12-16 | 2018-06-15 | 芜湖新兴铸管有限责任公司 | A kind of slag all iron content detection method |
| CN108918356A (en) * | 2018-05-18 | 2018-11-30 | 中建材（合肥）粉体科技装备有限公司 | A kind of mixed material squeezes smashed granularity prediction technique and system |
| CN108918356B (en) * | 2018-05-18 | 2021-07-09 | 中建材（合肥）粉体科技装备有限公司 | Method and system for predicting particle size of mixed material after extrusion and crushing |
| CN109046760A (en) * | 2018-09-26 | 2018-12-21 | 攀钢集团攀枝花钢铁研究院有限公司 | The recoverying and utilizing method of vanadium titano-magnetite tailing |
| CN109046760B (en) * | 2018-09-26 | 2021-04-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for recycling vanadium titano-magnetite tailings |
| CN112098505A (en) * | 2020-08-19 | 2020-12-18 | 安徽金安矿业有限公司 | Method for determining magnetic iron content of tailings by utilizing magnetic susceptibility principle |
| CN113466079A (en) * | 2021-06-30 | 2021-10-01 | 重庆钢铁股份有限公司 | Method for detecting component content of steel slag |
| CN113466079B (en) * | 2021-06-30 | 2023-05-16 | 重庆钢铁股份有限公司 | Method for detecting content of steel slag components |
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