CN109855988A - A kind of measuring method entering furnace pellet/pelletizing drop strength for refining lead skim - Google Patents
A kind of measuring method entering furnace pellet/pelletizing drop strength for refining lead skim Download PDFInfo
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- CN109855988A CN109855988A CN201910148758.2A CN201910148758A CN109855988A CN 109855988 A CN109855988 A CN 109855988A CN 201910148758 A CN201910148758 A CN 201910148758A CN 109855988 A CN109855988 A CN 109855988A
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Abstract
A kind of measuring method for entering furnace pellet/pelletizing drop strength for refining lead skim of the present invention, the selection of test sample: in same batch products, obtains submitted sample by the way of random sampling or systematic sampling；The test sample of selection is subjected to free drop test, obtains the gross mass of the fragment of each test sample；The evaluation index of the drop strength of same batch products is calculated according to the gross mass of obtained fragment
Description
Technical field
The invention belongs to nonferrous metallurgy fields, enter furnace pellet/pelletizing drop strength for refining lead skim more particularly to a kind of
Measuring method.
How to refining, lead enters furnace pellet, the drop strength of pelletizing is measured process and evaluation method.It is mentioned using this patent
High method can accurate, efficiently, succinctly, objectively evaluate the drop strength of pellet, pelletizing.It is mainly used in nonferrous metallurgy
Field also can be applied to the measurement of the products drop strength such as iron smelting pellets, sinter or coal.
Background technique
Refining lead, which enters the current processing method of furnace charge, roller/the methods of disk ball and pressure ball.Various method manufactures
To enter furnace charge material properties difference very big, especially drop strength, some products are non-friable and some be easy to it is broken；Some originals
Expect that water content is very high, raw material even mobility occurs；Some raw aqueous are considerably less, touch and desertify.But at present not
Most suitable method enters the drop strength of furnace charge to evaluate similar to refining lead.
In actual production, factory to the evaluation of drop strength and thinks little of at present, lays particular emphasis on regulation smelting parameter, addition
The mode of auxiliary material guarantees to produce direct motion, but and pays no attention to the insufficient bring additional energy of feedstock property.Drop strength is made
For the critically important property of one kind of refining leady raw materials, there is important influence for production direct motion, energy consumption, disposal of pollutants.But current
Method can not fully meet the evaluation of refining leady raw materials drop strength, these methods compare primarily with regard to coal, ironmaking green-ball
It is directly simple.This is because the manufacturing process comparative maturity of the products such as coal, ironmaking green-ball, quality is more stable, and use is some
Very simple method can obtain suitable result.Refining lead enter the quality of furnace charge because of moisture, pressure, at the influence of grading factors,
Dispersion degree is very big, not can be carried out accurate evaluation using existing method, for example, some enters furnace pellet in same batch of sample
Experience is fallen for 1 time just to be crushed completely, is just crushed completely for some experience 2 times, using the method for existing evaluation coal or green-ball,
Their drop strength is the same.But actually they are different, are possible to meet into furnace needs for second, but the first
It is then to be unsatisfactory for substantially.It is not crushed substantially in another example one kind enters furnace pellet, it only can be with the matter for falling loss < 1% every time
Amount；And no matter another kind is all only broken in two (2 pieces both greater than count size) several times, but be not in peeling phenomenon.It adopts
The first drop strength height can be obtained with out-of-date methods, but actually second of intensity can be lower for even lead skim.And it is right
In the raw material of the same batch, some is not crushed completely, and some is easy to be crushed；Directly seeking an average value can not be accurate
Evaluate the raw material of this batch in ground.Therefore, it designs a kind of new, fitting refining lead and enters the method for furnace charge demand to come objectively and accurately
The drop strength that evaluation lead skim enters furnace charge is necessary.
Industrially, refining lead enters furnace charge and needs to have certain compression strength and fall strength of briquette.It embodies are as follows: place,
It is not scattered because of compression when storage, does not fall ash because of evaporation；It carries, is not broken by lighter collision during feeding
It splits；It is not fragmentary because of the high temperature of fire door after in into furnace；When it is slight later broken to fall to furnace bottom, but being also able to maintain one section
Between it is not loose；Water content is few, but compression strength is moderate.
For requirement more complicated in this way, it is proper to design which type of drop strength evaluation method? it first has to simultaneous
It is very high and the case where almost without intensity to care for intensity.Secondly, wanting the sample that can objectively evaluate different broken states is in anything
Grade.Thirdly, it to apply easily, can especially implement in no auxiliary tool, to meet certain urgent feelings
Use under condition.Core is how to segment degree of crushing and mathematically be characterized, can be based on the industry of current maturation
Standard is improved.
Summary of the invention
The purpose of the present invention is to provide a kind of measuring method for entering furnace pellet/pelletizing drop strength for refining lead skim,
Solve the above deficiencies in the existing technologies.
In order to achieve the above object, the technical solution adopted by the present invention is that:
A kind of measuring method entering furnace pellet/pelletizing drop strength for refining lead skim provided by the invention, including it is following
Step:
The selection of S1, test sample: in same batch products, inspection is obtained by the way of random sampling or systematic sampling
Sample；
S2, the test sample for choosing S1 carry out free drop test, obtain the gross mass of the fragment of each test sample
mL；
S3, calculated according to the gross mass of the obtained fragment of S2 same batch products drop strength evaluation index
Preferably, in step S2, the specific method for carrying out free drop test to the test sample of selection is:
S21 falls sample from the calibration position of 2.5m, hits with bottom plate, several the first fragments is obtained, into S22；
S22 chooses quality in all first fragments obtained in S21 and is greater than 20% × m0The first fragment, Zhi Houcong
The calibration position of 2.5m is fallen, and is hit with bottom plate, several the second fragments are obtained, and carries out S23；
S23 chooses quality from all second fragments obtained in S22 and is greater than 20% × m0The second fragment, later
It falls from the calibration position of 2.5m, is hit with bottom plate, obtain several third fragments, carry out S24；
S24 calculates the quality chosen in S22 and is greater than 20% × m0The first fragment, the quality chosen in S23 be greater than 20%
×m0The second fragment and S23 obtained in quality be greater than 20% × m0Third fragment gross mass mL, and record the total of experiment
Number x=3.
Preferably, ground, which is fallen, is a little equipped with ceramic wafer or steel plate, wherein Hou Du≤1cm of ceramic wafer or steel plate, hardness
≧ 56HRC。
Preferably, if experiment number deficiency three times, and the quality of obtained fragment is respectively less than 20% × m0, then progress is recorded
The total degree x of experiment, and quality is calculated less than 20% × m0And it is greater than 10% × m0All fragments gross mass mL。
Preferably, in step S3, the calculation formula of the evaluation index of the drop strength of same batch products:
Wherein, QLX-iRefer to the drop strength of i-th of test sample；N indicates the sum for being used for test sample.
Preferably, QLXCalculation formula:
Wherein, n indicates the upper limit of drop strength, and 1~4 whole value is taken according to frangible degree；J is quality > 20%m0It is broken
The total quantity of piece, and j<5, when there is no quality>20%m after the test is ended0Fragment, then it is assumed that j is infinitely close to 0,
J=1 is taken at this time；m0For the original quality of sample.
Compared with prior art, the beneficial effects of the present invention are:
A kind of measuring method entering furnace pellet/pelletizing drop strength for refining lead skim provided by the invention, using this hair
The bright method advantage is, is no longer that mechanical low pass crosses mass loss or Volume Loss to measure falling by force for raw material
Degree, it is often more important that fallen by force based on completely broken number, the quality of remaining satisfactory fragment and quantity, batch sample
The factors such as the discreteness of degree are objective, scientifically evaluate the drop strength of raw material.The sample being applicable in includes: easily broken, frangible, no
Frangible, substantially not broken, etc., while it is different because of the broken factors such as number and number of tiles to be also applied for frangible but broken form
Sample covers all samples type substantially.
Further, it requires to obtain the gross mass m after falling single sample 3 times in S2L, main reason is that can be by band
Enter mLQ is obtained in formulaLX, in order to subsequent calculating.
Further, it requires to obtain in S3The parameter refers to the drop strength of the raw material of some batch, be by with
The Q for the single sample that machine sampling obtainsLXAveraging obtains.This is because the Q of single sampleLXA batch cannot be evaluated
Sample, it is therefore desirable to by seekingTo realize.
In conclusion the present invention, which can accurate, efficiently, succinctly, objectively evaluate different batches refining lead, enters falling for furnace charge
Intensity and the quality of production.
Detailed description of the invention
Fig. 1 is test device schematic diagram of the invention；
Fig. 2 is sample schematic diagram.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in more detail.
A kind of measuring method entering furnace pellet/pelletizing drop strength for refining lead skim provided by the invention, this method mention
The advantages of having taken other methods, and be bonded the characteristics of refining lead enters furnace charge and need to have carried out new design and demonstration, it can be to object
Material progress is objective, accurately evaluates.The following steps are included:
S1, the selection of test sample:
When for same batch products, submitted sample is obtained by the way of random sampling or systematic sampling, wherein when same
When one batch products≤3t, the quantity of test sample is 12；As same batch products > 3t, increase according to the quantity of 2/per.t
Add selection；
When for different batches and total amount < 3t, mixed and disorderly sample carry out a macroscopic evaluation, there are two types of methods: first, it can divide
Understand sample batch, is sampled according to the methods of sampling described in this.Second, if batch can not be distinguished one from the other, by object
Material regards an entirety as, doubles to choose sample using method of random sampling.
The diameter of test sample is 10mm~35mm；
S2, the test sample that S1 is chosen carry out free drop test, wherein falling distance is 2.5m；Ground is fallen a little
It is equipped with ceramic wafer or steel plate, wherein Hou Du≤1cm, Ying Du≤56HRC of ceramic wafer or steel plate, as shown in Figure 1；
Specifically:
S21 falls sample from the calibration position of 2.5m, hits with bottom plate, several the first fragments is obtained, into S22；
S22 chooses quality in all first fragments obtained in S21 and is greater than 20% × m0The first fragment, Zhi Houcong
The calibration position of 2.5m is fallen, and is hit with bottom plate, several the second fragments are obtained, and carries out S23；
S23 chooses quality from all second fragments obtained in S22 and is greater than 20% × m0The second fragment, later
It falls from the calibration position of 2.5m, is hit with bottom plate, obtain several third fragments, carry out S24；
S24 calculates the quality chosen in S22 and is greater than 20% × m0The first fragment, the quality chosen in S23 be greater than 20%
×m0The second fragment and S23 obtained in quality be greater than 20% × m0Third fragment gross mass mL, and record the total of experiment
Number x=3.
If experiment number deficiency is three times, and the quality of obtained fragment is respectively less than 20% × m0, then record is tested
Total degree x, and quality is calculated less than 20% × m0And it is greater than 10% × m0All fragments gross mass mL。
S3 calculates the evaluation index of the drop strength of same batch products according to the gross mass of the obtained fragment of S2Tool
Body:
The calculation formula of the drop strength of each test sample:
The calculation formula of the dispersion of the drop strength of each test sample:
The evaluation index of the drop strength of same batch productsCalculation formula:
Wherein, QLXRefer to the drop strength of some any sample；QLX-iRefer to the drop strength of i-th of test sample；N table
Show the sum for test sample；N indicates the upper limit of drop strength, and 1~4 whole value is taken according to frangible degree；J be quality >
20%m0Fragment total quantity, and j<5, if quality>20%m is not present after the test is ended0Fragment, then it is assumed that j without
Limit takes j=1 close to 0 at this time；m0For the original quality of sample.
Wherein, drop strength QLXIt is bigger, it indicates to be not easy to break into pieces into furnace charge particle；
Dispersion VLXIt is smaller；Indicate that the quality of same batch products is relatively uniform.
The calculation formula of the evaluation index of drop strength of the invention has certain similarity to relevant professional standard.
The difference is that the formula can be negative, for extremely frangible sample, its degree of crushing is segmented.It is related to
Country and professional standard have: " MT/T925-2004 industrial shaping coal drop strength measuring method ", " YB/T 4606-2017 sintering
The measurement of mine drop strength ", " measuring method of YB T 5166-1993 sinter and pellet drum strength ", " coke is fallen
Strength detection method (GB/T 4511.2-1999) ", " the drop strength measuring method of GB/T 15459-2006 coal ".
Certain lead refinery produces a batch using pressing process and enters the total 5t of furnace pellet, column, and nominal diameter 13cm needs to know
The drop strength of these pellets and the quality of production uniformity of pellet.By tentatively attempting, n=4, i.e. this batch products are taken
Maximum drop strength is 4.1% this batch sample has 7 kinds, and every kind all in 3t hereinafter, type is classified according to water content: 0%,
2%, 3%, 4%, 6%, 8%.Test result is as shown in table 1.
1 sample drop strength Q of tableLXWith pellet drop strengthTest result
The results show that pellet drop strength is in a first raised trend with the variation of water content.Illustrate the water in raw material
Content forms pellet and the size of fall strength of briquette is in a first positive influence.Furthermore VLXTrend presented with moisture content
One reversed trend illustrates the too low possible uniformity for influencing product quality of water content, the Q madeLXDispersion increases.Fig. 2 is aobvious
Show the sample after drop test, the complete crushing having, some is substantially intact.
Claims (6)
1. a kind of measuring method for entering furnace pellet/pelletizing drop strength for refining lead skim, which is characterized in that including following step
It is rapid:
The selection of S1, test sample: in same batch products, inspection sample is obtained by the way of random sampling or systematic sampling
Product；
S2, the test sample for choosing S1 carry out free drop test, obtain the gross mass m of the fragment of each test sampleL；
S3, calculated according to the gross mass of the obtained fragment of S2 same batch products drop strength evaluation index
2. a kind of measuring method for entering furnace pellet/pelletizing drop strength for refining lead skim according to claim 1, special
Sign is, in step S2, the specific method for carrying out free drop test to the test sample of selection is:
S21, sample is fallen from the calibration position of 2.5m, is hit with bottom plate, several the first fragments is obtained, into S22；
Quality is chosen in S22, all first fragments obtained in S21 is greater than 20% × m0The first fragment, later from 2.5m's
Calibration position is fallen, and is hit with bottom plate, several the second fragments are obtained, and carries out S23；
S23, quality is chosen from all second fragments obtained in S22 greater than 20% × m0The second fragment, later from 2.5m
Calibration position fall, hit with bottom plate, obtain several third fragments, carry out S24；
S24, the quality chosen in S22 is calculated greater than 20% × m0The first fragment, the quality chosen in S23 be greater than 20% × m0
The second fragment and S23 obtained in quality be greater than 20% × m0Third fragment gross mass mL, and record the total degree of experiment
X=3.
3. a kind of measuring method for entering furnace pellet/pelletizing drop strength for refining lead skim according to claim 2, special
Sign is that ground, which is fallen, is a little equipped with ceramic wafer or steel plate, wherein Hou Du≤1cm, Ying Du≤56HRC of ceramic wafer or steel plate.
4. a kind of measuring method for entering furnace pellet/pelletizing drop strength for refining lead skim according to claim 2, special
Sign is, if experiment number deficiency is three times, and the quality of obtained fragment is respectively less than 20% × m0, then record is tested total
Number x, and quality is calculated less than 20% × m0And it is greater than 10% × m0All fragments gross mass mL。
5. a kind of measuring method for entering furnace pellet/pelletizing drop strength for refining lead skim according to claim 1, special
Sign is, in step S3, the evaluation index of the drop strength of same batch productsCalculation formula:
Wherein, QLX-iRefer to the drop strength of i-th of test sample；N indicates the sum for being used for test sample.
6. a kind of measuring method for entering furnace pellet/pelletizing drop strength for refining lead skim according to claim 5, special
Sign is, QLX-iCalculation formula:
Wherein, n indicates the upper limit of drop strength, and 1~4 whole value is taken according to frangible degree；J is quality > 20%m0Fragment it is total
Quantity, and j<5, when there is no quality>20%m after the test is ended0Fragment, then it is assumed that j is infinitely close to 0, takes j at this time
=1；m0For the original quality of sample.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238971A (en) * | 2020-02-07 | 2020-06-05 | 西安建筑科技大学 | Method for evaluating falling strength of green pellets |
| CN111596030A (en) * | 2019-09-02 | 2020-08-28 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method for quickly evaluating tunnel slag performance of aggregate prepared by machine |
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2019
- 2019-02-28 CN CN201910148758.2A patent/CN109855988B/en active Active
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| YADONG LI ET AL: "High-pressure densification of wood residues to form an upgraded fuel", 《BIOMASS AND BIOENERGY》 * |
| 国家发展和改革委员会: "《MT/T 925-2004 工业型煤落下强度测定方法》", 14 December 2004 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111596030A (en) * | 2019-09-02 | 2020-08-28 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method for quickly evaluating tunnel slag performance of aggregate prepared by machine |
| CN111596030B (en) * | 2019-09-02 | 2023-01-24 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method for quickly evaluating tunnel slag performance of aggregate prepared by machine |
| CN111238971A (en) * | 2020-02-07 | 2020-06-05 | 西安建筑科技大学 | Method for evaluating falling strength of green pellets |
| CN111238971B (en) * | 2020-02-07 | 2022-10-21 | 西安建筑科技大学 | Method for evaluating falling strength of green pellets |
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