CN104458795A - Method for rapidly and accurately measuring cracking temperature of green pellets - Google Patents
Method for rapidly and accurately measuring cracking temperature of green pellets Download PDFInfo
- Publication number
- CN104458795A CN104458795A CN201410706710.6A CN201410706710A CN104458795A CN 104458795 A CN104458795 A CN 104458795A CN 201410706710 A CN201410706710 A CN 201410706710A CN 104458795 A CN104458795 A CN 104458795A
- Authority
- CN
- China
- Prior art keywords
- green
- ball
- temperature
- green pellets
- break temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses a method for rapidly and accurately measuring the cracking temperature of green pellets. The method comprises steps as follows: preparation of the green pellets: evenly mixing 97.5-98.0% of powdered iron with 2.0-2.5% of bentonite, enabling the moisture content of the mixture to be in a range of 7-7.5%, and performing pelletizing in a disc pelletizer; screening: screening the green pellets with sieves with apertures of 10 mm and 12 mm, and taking green pellets with the apertures ranging from 10 mm to 12 mm as measurement samples; detection and determination of the cracking temperature of the green pellets: during detection, placing 50 green pellets into a test glass every time, placing the test glass into a measuring device heated to 500-600 DEG C, performing blast drying in hot air of 1.6-2.0 m/s for 2.0-3.0 min, and recording the temperature when the green pellets make cracking sounds; pouring out the green pellets after measurement, and taking the temperature when two green pellets crack as the cracking temperature of the batch of green pellets; if more than or less than 2 green pellets crack, decreasing or increasing the temperature of the measuring device for re-measurement until the 2 green pellets crack. With the adoption of the method, the accuracy of measurement of the cracking temperature of the green pellets is improved effectively, and 50% of measurement time is saved.
Description
Technical field
The invention belongs to pellet quality inspection technology field, be specifically related to a kind of fast, the assay method of pellet raw ball break temperature accurately.
Background technology
In the production run of iron ore pellets ore deposit, green-ball breaking in drying is that normal operation and one of key factor of pellet quality is produced in impact, and its break temperature is the important index of in pellet production.The break temperature of green-ball refers to that 50 green-balls are in mensuration process, using green-ball break number be 2 time corresponding temperature as the criterion of this batch of green-ball break temperature.In recent years, produce raw material used for pellet and there occurs great changes, the failure mode of green-ball in drying also there occurs larger change.Breaking of green-ball was changed to current explosion is completely become granule by the former shape that cracks, and the temperature and time that green-ball breaks also there occurs change thereupon.Change due to green-ball break temperature has influence on the normal operation that pellet is produced, optimize and improve the assay method of green-ball break temperature, the accuracy that effective raising green-ball break temperature measures and ageing, for pelletizing production provides conforming to property strong, accurately, reliable technological parameter, the normal operation of produce pellet and the stable lifting of pellet quality, be all of great practical significance undoubtedly.
Summary of the invention
The object of the present invention is to provide a kind of fast, the assay method of pellet raw ball break temperature accurately.
The object of the present invention is achieved like this, described fast, the assay method of pellet raw ball break temperature accurately, comprise green-ball preparation, screening, green-ball break temperature detects and green-ball break temperature judges operation, specifically comprise:
Prepared by A, green-ball: mixed by the bentonitic clay of the Iron concentrate of 97.5 ~ 98.0% and 2.0 ~ 2.5%, and the water percentage controlling compound is 7 ~ 7.5%, pelletizing in disc balling machine.
B, screening: the sieve screening green-ball aperture of preparing in operation A being respectively 10mm, 12mm, get the green-ball of 10 ~ 12mm grade as the sample measuring break temperature.
C, green-ball break temperature detect: get 50 green-balls during detection at every turn and load in test glass, test glass is put into the green-ball break temperature determinator having risen to 500 ~ 600 DEG C, forced air drying 2.0 ~ 3.0min in the thermal current of speed 1.6 ~ 2.0m/s, records green-ball and produces temperature corresponding when breaking the sound in mensuration process.
D, green-ball break temperature judge: measure after terminating and pour out green-ball, using green-ball break number be 2 time corresponding temperature as the break temperature of this batch of green-ball, if green-ball breaks during several > 2 or < 2, the temperature then reduced respectively or raise green-ball break temperature determinator measures again, breaks till number is 2 until green-ball.
Assay method of the present invention, by optimizing green-ball preparation condition, improves characterization processes and the decision criteria of green-ball break temperature, effectively improves the accuracy that green-ball break temperature measures, has saved the minute of 50%.For effective adjustment of green-ball drying process, the stable lifting of the normal operation that pellet is produced and pellet quality provides strong technical support, and for pelletizing production provides echoing property by force, accurate, reliable technological parameter, has higher application value.
Accompanying drawing explanation
Fig. 1 is green-ball break temperature determinator schematic diagram of the present invention;
In figure: 1---electric furnace, 2---temperature-control heat couple, 3---hot blast thermopair, 4---heat exchanger, 5---test glass, 6---glass rotameter, 7---control valve, 8---blower fan, 9---pipeline, 10---pipeline, 11---pipeline.
Embodiment
The present invention is further illustrated below, but limited the present invention never in any form, and any conversion done based on training centre of the present invention or replacement, all belong to protection scope of the present invention.
Of the present invention fast, the assay method of pellet raw ball break temperature accurately, comprise green-ball preparation, screening, green-ball break temperature detects and green-ball break temperature judges operation, specifically comprise:
Described green-ball preparation section refers to and is mixed by the bentonitic clay of the Iron concentrate of 97.5 ~ 98.0% and 2.0 ~ 2.5%, and the water percentage controlling compound is 7 ~ 7.5%, pelletizing in disc balling machine.
Described screening operation refers to the sieve screening green-ball aperture of preparing in above-mentioned operation being respectively 10mm, 12mm, gets the green-ball of 10 ~ 12mm grade as the sample measuring break temperature.
Described green-ball break temperature detects when operation refers to detection to be got in 50 green-balls loading test glasses at every turn, test glass is put into the green-ball break temperature determinator having risen to 500 ~ 600 DEG C, forced air drying 2.0 ~ 3.0min in the thermal current of speed 1.6 ~ 2.0m/s, records green-ball and produces temperature corresponding when breaking the sound in mensuration process.
Described green-ball break temperature judges that operation refers to that mensuration pours out green-ball after terminating, using green-ball break number be 2 time corresponding temperature as the break temperature of this batch of green-ball, if green-ball breaks during several > 2 or < 2, the temperature then reduced respectively or raise green-ball break temperature determinator measures again, breaks till number is 2 until green-ball.
In Iron concentrate described in green-ball preparation section, the content of the particulate of particle diameter < 0.074mm is 88 ~ 92%.
In bentonitic clay described in green-ball preparation section, the content of the particulate of particle diameter < 0.074mm is 95 ~ 98%.
Disc balling machine described in green-ball preparation section is Ф 6000 × 600 type disc balling machine.
The rotating speed of the disc balling machine described in green-ball preparation section is 7r/min, and inclination angle is 47 °.
The determinator used in green-ball break temperature detection operation is by the stainless steel electric furnace 1 of Φ 650 × 1000, the temperature-control heat couple 2 of E type nickel chromium triangle-copper nickel, the hot blast thermopair 3 of E type nickel chromium triangle-copper nickel, the stainless steel heat exchanger 4 of Φ 80 × 1400, Φ 50 × 180 bottom even arranges stainless steel test glass 5, LZB-25 glass rotameter 6, the DN25 control valve 7 of 86 Φ 3mm circular holes, DR14X20 roots blower 8, Φ 50 metallic conduit 9,10,11 forms.Connected mode between each composition component is shown in accompanying drawing 1.
The speed of the thermal current that green-ball break temperature detects described in operation is 1.8m/s, and the forced air drying time is 2.5min.
Green-ball break temperature judges reduction described in operation or raises hot stream temperature to refer to and reduce or raise 5 ~ 100 DEG C at every turn.
embodiment 1
(1) assay method of green-ball break temperature of the present invention
The bentonitic clay of the Iron concentrate of 97.5% and 2.5% is mixed, in Iron concentrate, the content of the particulate of particle diameter < 0.074mm is 90%, in bentonitic clay, the content of the particulate of particle diameter < 0.074mm is 96%, and the water percentage controlling compound is 7 ~ 7.5%.Pelletizing in Ф 6000 × 600 type disc balling machine, the rotating speed of disc balling machine is 7r/min, and inclination angle is 47 °.By the green-ball diameter 300mm prepared in above-mentioned operation, aperture is respectively the sieve screening of 10mm, 12mm, gets the green-ball of 10 ~ 12mm grade as the sample measuring break temperature.Get 50 green-balls during detection loads in test glass at every turn, test glass is put into the green-ball break temperature determinator having risen to 500 ~ 600 DEG C, forced air drying 2.5min in the thermal current of speed 1.8m/s, records green-ball and produces temperature corresponding when breaking the sound in mensuration process.Green-ball is poured out after mensuration terminates, using green-ball break number be 2 time corresponding temperature as the break temperature of this batch of green-ball, if green-ball breaks during several > 2 or < 2, the temperature 15 DEG C then reduced respectively or raise green-ball break temperature determinator measures again, breaks till number is 2 until green-ball.
(2) assay method of existing green-ball break temperature
The different of testing conditions and decision criteria are from the key distinction of the assay method of green-ball break temperature of the present invention:
(1) the green-ball break temperature determinator rising to 500 ~ 600 DEG C, by test glass is put into, forced air drying 5.0min in the thermal current of speed 1.8m/s.
(2) temperature when, putting into green-ball break temperature determinator using test glass is as the break temperature of green-ball.
(3) measurement result:
Adopt the assay method of existing green-ball break temperature: green-ball minute 5.0min, break temperature index are 550 DEG C;
Adopt the assay method of green-ball break temperature of the present invention: green-ball minute 2.5min, break temperature index are 530 DEG C.
Two kinds of assay methods are compared, and assay method of the present invention makes the minute of green-ball break temperature shorten 2.5 min, and the accuracy of break temperature index improves 20 DEG C.
embodiment 2
(1) assay method of green-ball break temperature of the present invention
The bentonitic clay of the Iron concentrate of 98.0% and 2.0% is mixed, in Iron concentrate, the content of the particulate of particle diameter < 0.074mm is 92%, in bentonitic clay, the content of the particulate of particle diameter < 0.074mm is 95%, and the water percentage controlling compound is 7 ~ 7.5%.Pelletizing in Ф 6000 × 600 type disc balling machine, the rotating speed of disc balling machine is 7r/min, and inclination angle is 47 °.By the green-ball diameter 300mm prepared in above-mentioned operation, aperture is respectively the sieve screening of 10mm, 12mm, gets the green-ball of 10 ~ 12mm grade as the sample measuring break temperature.Get 50 green-balls during detection loads in test glass at every turn, test glass is put into the green-ball break temperature determinator having risen to 500 ~ 600 DEG C, forced air drying 2.5min in the thermal current of speed 1.8m/s, records green-ball and produces temperature corresponding when breaking the sound in mensuration process.Green-ball is poured out after mensuration terminates, using green-ball break number be 2 time corresponding temperature as the break temperature of this batch of green-ball, if green-ball breaks during several > 2 or < 2, the temperature 5 DEG C then reduced respectively or raise green-ball break temperature determinator measures again, breaks till number is 2 until green-ball.
(2) assay method of existing green-ball break temperature
With embodiment 1.
(3) measurement result:
Adopt the assay method of existing green-ball break temperature: green-ball minute 5.0min, break temperature index are 510 DEG C;
Adopt the assay method of green-ball break temperature of the present invention: green-ball minute 2.5min, break temperature index are 495 DEG C.
Two kinds of assay methods are compared, and assay method of the present invention makes the minute of green-ball break temperature shorten 2.5 min, and the accuracy of break temperature index improves 15 DEG C.
embodiment 3
(1) assay method of green-ball break temperature of the present invention
The bentonitic clay of the Iron concentrate of 97.7% and 2.3% is mixed, in Iron concentrate, the content of the particulate of particle diameter < 0.074mm is 88%, in bentonitic clay, the content of the particulate of particle diameter < 0.074mm is 98%, and the water percentage controlling compound is 7 ~ 7.5%.Pelletizing in Ф 6000 × 600 type disc balling machine, the rotating speed of disc balling machine is 7r/min, and inclination angle is 47 °.By the green-ball diameter 300mm prepared in above-mentioned operation, aperture is respectively the sieve screening of 10mm, 12mm, gets the green-ball of 10 ~ 12mm grade as the sample measuring break temperature.Get 50 green-balls during detection loads in test glass at every turn, test glass is put into the green-ball break temperature determinator having risen to 500 ~ 600 DEG C, forced air drying 2.5min in the thermal current of speed 1.8m/s, records green-ball and produces temperature corresponding when breaking the sound in mensuration process.Green-ball is poured out after mensuration terminates, using green-ball break number be 2 time corresponding temperature as the break temperature of this batch of green-ball, if green-ball breaks during several > 2 or < 2, the temperature 10 DEG C then reduced respectively or raise green-ball break temperature determinator measures again, breaks till number is 2 until green-ball.
(2) assay method of existing green-ball break temperature
With embodiment 1.
(3) measurement result:
Adopt the assay method of existing green-ball break temperature: green-ball minute 5min, break temperature index are 570 DEG C;
Adopt the assay method of green-ball break temperature of the present invention: green-ball minute 2.5min, break temperature index are 557 DEG C.
Two kinds of assay methods are compared, and assay method of the present invention makes the minute of green-ball break temperature shorten 2.5 min, and the accuracy of break temperature index improves 13 DEG C.
Claims (6)
1. fast, the assay method of pellet raw ball break temperature accurately, it is characterized in that comprising green-ball preparation, screening, green-ball break temperature detects and green-ball break temperature judges operation, specifically comprise:
Prepared by A, green-ball: mixed by the bentonitic clay of the Iron concentrate of 97.5 ~ 98.0% and 2.0 ~ 2.5%, and the water percentage controlling compound is 7 ~ 7.5%, pelletizing in disc balling machine;
B, screening: the sieve screening green-ball aperture of preparing in operation A being respectively 10mm, 12mm, get the green-ball of 10 ~ 12mm grade as the sample measuring break temperature;
C, green-ball break temperature detect: get 50 green-balls during detection at every turn and load in test glass, test glass is put into the green-ball break temperature determinator having risen to 500 ~ 600 DEG C, forced air drying 2.0 ~ 3.0min in the thermal current of speed 1.6 ~ 2.0m/s, records green-ball and produces temperature corresponding when breaking the sound in mensuration process;
D, green-ball break temperature judge: measure after terminating and pour out green-ball, using green-ball break number be 2 time corresponding temperature as the break temperature of this batch of green-ball, if green-ball breaks during several > 2 or < 2, the temperature then reduced respectively or raise green-ball break temperature determinator measures again, breaks till number is 2 until green-ball.
2. assay method according to claim 1, is characterized in that the content of the particulate of particle diameter < 0.074mm in the Iron concentrate described in operation A is 88 ~ 92%.
3. assay method according to claim 1, is characterized in that the content of the particulate of particle diameter < 0.074mm in the bentonitic clay described in operation A is 95 ~ 98%.
4. assay method according to claim 1, it is characterized in that the rotating speed of the disc balling machine described in operation A is 7r/min, inclination angle is 47 °.
5. assay method according to claim 1, it is characterized in that the speed of the thermal current described in operation C is 1.8m/s, the forced air drying time is 2.5min.
6. assay method according to claim 1, is characterized in that reduction described in step D or raises hot stream temperature referring to and reducing or raise 5 ~ 100 DEG C at every turn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410706710.6A CN104458795A (en) | 2014-12-01 | 2014-12-01 | Method for rapidly and accurately measuring cracking temperature of green pellets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410706710.6A CN104458795A (en) | 2014-12-01 | 2014-12-01 | Method for rapidly and accurately measuring cracking temperature of green pellets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104458795A true CN104458795A (en) | 2015-03-25 |
Family
ID=52905193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410706710.6A Pending CN104458795A (en) | 2014-12-01 | 2014-12-01 | Method for rapidly and accurately measuring cracking temperature of green pellets |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104458795A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053516A (en) * | 2016-08-02 | 2016-10-26 | 中国地质大学（北京） | Thermo-acoustic temperature measurement device for mineral inclusion |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3425823A (en) * | 1966-12-05 | 1969-02-04 | Nalco Chemical Co | Method of improving shock temperature of metallic pellets |
| CA828083A (en) * | 1969-11-25 | J. Ward William | Method of improving shock temperature of metallic pellets | |
| CN101457291A (en) * | 2007-12-12 | 2009-06-17 | 范英俊 | Equipment for producing oxidized pellet and method for producing oxidized pellet by using the same |
| CN102485921A (en) * | 2010-12-03 | 2012-06-06 | 攀钢集团钢铁钒钛股份有限公司 | Pellet production method of vanadium-titanium magnetite concentrate |
| CN102766763A (en) * | 2012-08-01 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Manufacturing method of magnesian pellets |
| CN203069535U (en) * | 2013-01-30 | 2013-07-17 | 中南大学 | Pellet decrepitation temperature measurement device |
| CN103614551A (en) * | 2013-12-11 | 2014-03-05 | 武钢集团昆明钢铁股份有限公司 | Pellet ore with good metallurgical property and proper alkalinity, and preparation method thereof |
| CN103645205A (en) * | 2013-12-05 | 2014-03-19 | 攀枝花钢城集团有限公司 | Methods for detecting cracking temperature of green pellets |
| CN103882223A (en) * | 2014-04-02 | 2014-06-25 | 山西太钢不锈钢股份有限公司 | Method for increasing bursting temperature of laterite nickel ore pellets |
| CN103924069A (en) * | 2014-04-15 | 2014-07-16 | 四川省川威集团有限公司 | Method for preparing oxidized pellets by utilizing iron-containing royalex sea sand concentrates as raw materials |
| CN203960294U (en) * | 2014-07-09 | 2014-11-26 | 武汉钢铁集团矿业有限责任公司程潮铁矿 | Bursting temperature of pellet ores metering equipment |
-
2014
- 2014-12-01 CN CN201410706710.6A patent/CN104458795A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA828083A (en) * | 1969-11-25 | J. Ward William | Method of improving shock temperature of metallic pellets | |
| US3425823A (en) * | 1966-12-05 | 1969-02-04 | Nalco Chemical Co | Method of improving shock temperature of metallic pellets |
| CN101457291A (en) * | 2007-12-12 | 2009-06-17 | 范英俊 | Equipment for producing oxidized pellet and method for producing oxidized pellet by using the same |
| CN102485921A (en) * | 2010-12-03 | 2012-06-06 | 攀钢集团钢铁钒钛股份有限公司 | Pellet production method of vanadium-titanium magnetite concentrate |
| CN102766763A (en) * | 2012-08-01 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Manufacturing method of magnesian pellets |
| CN203069535U (en) * | 2013-01-30 | 2013-07-17 | 中南大学 | Pellet decrepitation temperature measurement device |
| CN103645205A (en) * | 2013-12-05 | 2014-03-19 | 攀枝花钢城集团有限公司 | Methods for detecting cracking temperature of green pellets |
| CN103614551A (en) * | 2013-12-11 | 2014-03-05 | 武钢集团昆明钢铁股份有限公司 | Pellet ore with good metallurgical property and proper alkalinity, and preparation method thereof |
| CN103882223A (en) * | 2014-04-02 | 2014-06-25 | 山西太钢不锈钢股份有限公司 | Method for increasing bursting temperature of laterite nickel ore pellets |
| CN103924069A (en) * | 2014-04-15 | 2014-07-16 | 四川省川威集团有限公司 | Method for preparing oxidized pellets by utilizing iron-containing royalex sea sand concentrates as raw materials |
| CN203960294U (en) * | 2014-07-09 | 2014-11-26 | 武汉钢铁集团矿业有限责任公司程潮铁矿 | Bursting temperature of pellet ores metering equipment |
Non-Patent Citations (3)
| Title |
|---|
| 康兴东 等: "提高大冶铁精矿球团质量的试验研究", 《金属矿山》 * |
| 朱德庆 等: "铁矿球团中有机复合膨润土的强化机理", 《重庆大学学报》 * |
| 杨雪峰: "混合铁精矿生产氧化球团的基础与应用研究", 《万方学位论文》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053516A (en) * | 2016-08-02 | 2016-10-26 | 中国地质大学（北京） | Thermo-acoustic temperature measurement device for mineral inclusion |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104090091A (en) | Method for detecting steel-slag stability of full-graded steel-slag concrete | |
| CN106391218B (en) | Wet type ball mill discharging granulation uniformity detection device | |
| CN108106961A (en) | A kind of detection method of blast furnace ironmaking coke reactivity | |
| CN107561251A (en) | A kind of cement-based material cracking sensitivity test device and method of testing | |
| CN104458795A (en) | Method for rapidly and accurately measuring cracking temperature of green pellets | |
| CN104458789A (en) | Method for detecting high temperature performance of iron ore powder | |
| CN203069535U (en) | Pellet decrepitation temperature measurement device | |
| CN107589304A (en) | A kind of method of testing of glass melt high-temperature resistivity | |
| CN108892448A (en) | A kind of preparation method reducing thermal expansion coefficient of concrete | |
| US20130243027A1 (en) | Thermal erosion tester | |
| CN110057692A (en) | A kind of agglomeration for iron mine Binder Phase adhesion strength measuring method | |
| CN107607573B (en) | Novel method for predicting hot cracking tendency of alloy | |
| CN105067478A (en) | Method and device for detecting powder rate of dry pellets | |
| CN106197027A (en) | A kind of device and method detecting dry type ramming refractory material sintering character | |
| CN104402474A (en) | Preparation process for anti-explosion castable | |
| CN109855988A (en) | A kind of measuring method entering furnace pellet/pelletizing drop strength for refining lead skim | |
| CN102033021A (en) | Testing method for quantifying sintering property of flow guiding sand | |
| CN107655780A (en) | A kind of method for evaluating Iron concentrate balling property | |
| CN101701853B (en) | Method for measuring heat treatment degree by judging final temperature of thermal kiln furnace | |
| CN206696105U (en) | A kind of green pellets drop strength determines device | |
| CN106987710A (en) | A kind of online pre-control method of pelletizing production technique and device | |
| Granlund | Understanding the basics of green sand testing | |
| CN112067455A (en) | High-temperature crushing value test method for coarse aggregate | |
| Stachowicz et al. | Impact of density degree and grade of inorganic binder on behavior of molding sand at high temperature | |
| CN114636625A (en) | Detection and evaluation method for strength of sintered and granulated pellets |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150325 |