CN107561115A - A kind of detection method of sintering quick lime pyroreaction characteristic - Google Patents
A kind of detection method of sintering quick lime pyroreaction characteristic Download PDFInfo
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- CN107561115A CN107561115A CN201610504867.XA CN201610504867A CN107561115A CN 107561115 A CN107561115 A CN 107561115A CN 201610504867 A CN201610504867 A CN 201610504867A CN 107561115 A CN107561115 A CN 107561115A
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Abstract
The invention discloses a kind of detection method of sintering quick lime pyroreaction characteristic, by quick lime to be detected, Fe2O3Reagent is pressed into circular little cake respectively；Little cake sample is placed in mini-sintering stove on sample holder, Fe2O3For reagent little cake under, quick lime little cake is placed on it；Heating is tested；Viewing test little cake；By comparing the height of quick lime reaction starting temperature, to detect the pyroreaction characteristic of the quick lime.Mineralization machanism of the invention directly against high basicity sinter, by determining quick lime and chemical reagent Fe2O3Reaction starting temperature detect the high temperature reactivity of quick lime, being capable of pyroreaction characteristic of objective, the accurate reaction quick lime in sintering process.
Description
Technical field
The invention belongs to ironmaking production technical field, is related to the staflux of iron-smelting raw material, more particularly to a kind of to sinter
With the detection method of quick lime pyroreaction characteristic.
Background technology
Quick lime main component is CaO, pure for white typically in bulk, is light gray or faint yellow during containing impurity.
Quick lime is important calcium base flux during iron ore sintering, and its main function has two：First, strengthen the granulation of Iron Ore Powder.
Quick lime fine size, specific surface area is big, after meeting water digestion, can form colloidal solution, can substantially improve the intensity of sintering feed and steady
It is qualitative, you can to accelerate pelletizing speed, and can improves dry, the intensity and heat endurance of wet bulb；Second, in sintering process with iron ore
The low melting point phases such as powder reaction generation calcium ferrite.In reality production, sintering quick lime species is various, and also difference is larger for quality.
At present, the evaluation to sintering quick lime only rests on the layers such as chemical composition, activity degree analysis or Water Chemistry Analysis
Face.Activity degree embodies respond of the lime at normal temperatures with other materials, is one of important indicator for examining lime quality.
A certain amount of quick lime is fused in water, stirred, made of phenolphthalein mainly according to acid-base neutralization principle by activity degree analytic approach
Indicator, and titrated with hydrochloric acid, the activity degree of quick lime is characterized with the hydrochloric acid content consumed in certain time.Water Chemistry Analysis method
It is to dissolve in a certain amount of quick lime in water, quick lime can react generation Ca (OH) with water2, and heat is discharged, pass through measurement
Increasing water temperature judges the quality of quick lime.
Activity degree and aquation method simply measure ability of the alkaline staflux at normal temperatures with pure acid reaction, can not
Simulate the quality of flux pyroreaction in sintering process.
The formation of each ore deposit phase in sintering process, the solid phase reaction of oxides-containing iron in basic solvent and ore is started from, then
The liquid phase based on calcium ferrite is generated, the nuclear matter that liquid phase bonds surrounding forms sintering deposit.Quick lime aoxidizes with iron content in ore
The height of thing reaction starting temperature, the temperature that low melting point in sintering process initially forms is directly affected, influences sintering deposit
Ore deposit phase composition, and then influence the intensity and metallurgical performance of sintering deposit.Under conditions of raw materials for sintering is consistent with technological parameter, raw stone
Ash can turn into an important indicator for investigating quick lime pyroreaction characteristic with iron in ore oxide reaction starting temperature.For
Make up existing method quick lime is carried out in sintering process high temperature reactivity to evaluate this not reasonable and comprehensive defect, carry
It is highly significant to go out a kind of new quick lime high temperature reactivity detection method.
The content of the invention
The present invention is can only to evaluate chemical reaction under quick lime normal temperature to solve existing quick lime method for testing performance
Ability, and can not rationally comprehensive simulated its sintering process high temperature reactivity worth the defects of, and then provide a kind of sintering life
The detection method of lime high temperature response characteristic.
In order to solve the above problems, the present invention uses following technical scheme：
A kind of detection method of sintering quick lime pyroreaction characteristic, comprises the following steps：
(1) by quick lime to be detected it is compressing be 10~15mm of diameter, 3~6g of quality circular little cake；By Fe2O3
It is 20~25mm of diameter that reagent is compressing, 8~12g of quality circular little cake；
(2) little cake sample is placed on the sample holder of mini-sintering stove, Fe2O3Under, quick lime little cake is placed in reagent little cake
Thereon, and quick lime little cake is made to be in Fe2O3Reagent little cake center；
(3) firing test device, heating are tested, and temperature control system is：900 DEG C are raised to 6~10min by room temperature, 900
1000 DEG C DEG C are raised to 3~6min, 1000 DEG C are raised to 1150 DEG C with 5~8min, then with the 8 DEG C~15 DEG C/min rate of heat addition
Be heated to test temperature, in test temperature 5~8min of constant temperature, 1000 DEG C cooled to 5~10min by test temperature, power-off from
So cooling, takes out after sample is cooled to room temperature；
(4) viewing test little cake, if Fe2O3Reagent little cake and product institute shape on quick lime little cake contact surface to be tested
Difference into circle diameter and quick lime little cake diameter is 2mm~4mm, then this test temperature is quick lime reaction starting temperature；
If Fe2O3Reagent little cake with product forms circle diameter on quick lime little cake contact surface to be tested and quick lime little cake is straight
The difference in footpath is more than 4mm, then Fe2O3Reagent little cake is superfused, and reduces test temperature；If Fe2O3Reagent little cake and raw stone to be tested
There is no product on grey little cake contact surface, or product forms circle diameter and the difference of quick lime little cake diameter is less than 2mm,
Then Fe2O3Reagent little cake does not start to react, then raises test temperature；Test temperature is raised and lowered every time as 3~10 DEG C；
(5) by determining the reaction starting temperature of quick lime, to detect the pyroreaction characteristic of the quick lime.
Quick lime and Fe to be checked described in step (1)2O3Reagent, its granularity is between the mesh of 200 mesh~150；Its is compressing
Pressure is 15~20MPa, and pressing forming time is 10min~20min.
Described in step (3) during elevated temperature test, air is passed through into experimental rig, air mass flow is 3~5L/min.
The present invention has the advantages that compared with prior art：The present invention is directly against high basicity sinter into ore deposit machine
Reason, by determining quick lime and chemical reagent Fe2O3Reaction starting temperature detect the high temperature reactivity of quick lime, can
Pyroreaction characteristic of objective, the accurate reaction quick lime in sintering process.
Embodiment
Embodiment 1
The quick lime A and quick lime B of different sources to be detected, wherein quick lime A and B CaO content is respectively 78.5%
With 78.2%；Quick lime A and B are ground, its granularity is more than 200 mesh less than 150 mesh；Quick lime A and B are suppressed respectively
It is shaped to diameter 12mm, quality 4g circular little cake.To Fe2O3Reagent is ground, and its granularity is less than 150 mesh and is more than 200
Mesh；By Fe2O3It is diameter 22mm that reagent is compressing, quality 10g circular little cake.Quick lime and Fe to be checked2O3The compacting of reagent
Briquetting pressure is 16MPa, pressing forming time 18min.
By quick lime A little cakes and Fe2O3Reagent little cake is placed on the sample holder of mini-sintering stove, Fe2O3Reagent little cake exists
Under, quick lime little cake is placed on it, and quick lime little cake is in Fe2O3Reagent little cake center；Start mini-sintering stove, rise
Temperature is tested, and temperature control system is：900 DEG C are raised to 6min by room temperature, and 900 DEG C are raised to 1000 DEG C with 3min, and 1000 DEG C are raised to
1150 DEG C with 5min, then with 10 DEG C/min heating rate to 1250 DEG C, in 1250 DEG C of constant temperature 6min, by 1250 DEG C of drops
Temperature with 5min, powers off Temperature fall, taken out after sample is cooled to room temperature to 1000 DEG C.During experiment, to mini-sintering stove
In be passed through air, air mass flow 3L/min.
Viewing test little cake, Fe2O3There is no product on reagent little cake and quick lime little cake contact surface to be tested, then Fe2O3
Reagent little cake does not start to react, then raises test temperature；3 DEG C of test temperature of rise every time, is tested again by above-mentioned steps.
When test temperature be 1271 DEG C, Fe2O3Reagent little cake is formed with product on quick lime little cake contact surface to be tested
The difference of circle diameter and quick lime little cake diameter is less than 4mm more than 2mm, then 1271 DEG C of reaction starting temperatures for quick lime A.
Reaction starting temperature with same method detection quick lime B is 1285 DEG C.
Found by being detected to quick lime A and B reaction starting temperature, although quick lime A and the B basic phase of CaO content
Together, but quick lime A reaction starting temperature it is lower than quick lime B 14 DEG C, i.e., sintering process parameter and iron charge composition identical bar
Under part, quick lime A is easier to react with Iron Ore Powder, and its pyroreaction characteristic is better than quick lime B.
Embodiment 2
Different sources quick lime C and quick lime D to be detected, wherein quick lime C CaO content are 79.2%, quick lime D
CaO content be 80.3%；Quick lime C and D are ground, its granularity is more than 200 mesh less than 160 mesh；By quick lime C and
Compressing D difference is diameter 14mm, quality 6g circular little cake.To Fe2O3Reagent is ground, and its granularity is less than 160 mesh
More than 200 mesh；By Fe2O3It is diameter 24mm that reagent is compressing, quality 11g circular little cake.Quick lime and Fe to be checked2O3Examination
The compressing pressure of agent is 18MPa, pressing forming time 14min.
By quick lime C little cakes and Fe2O3Reagent little cake is placed on the sample holder of mini-sintering stove, Fe2O3Reagent little cake exists
Under, quick lime little cake is placed on it, and quick lime little cake is in Fe2O3Reagent little cake center；Start mini-sintering stove, rise
Temperature is tested, and temperature control system is：900 DEG C are raised to 9min by room temperature, and 900 DEG C are raised to 1000 DEG C with 5min, and 1000 DEG C are raised to
1150 DEG C with 8min, then with 12 DEG C/min heating rate to 1290 DEG C, in 1290 DEG C of constant temperature 5min, by test temperature
1000 DEG C are cooled to 8min, Temperature fall is powered off, is taken out after sample is cooled to room temperature；During experiment, to mini-sintering
Air, air mass flow 4L/min are passed through in stove.
Viewing test little cake, Fe2O3It is straight that reagent little cake with product on quick lime little cake contact surface to be tested forms circumference
Footpath and the difference of quick lime little cake diameter are more than 4mm, then Fe2O3Reagent little cake is superfused, and reduces test temperature；Reduce test temperature 5
DEG C, tested again by above-mentioned steps.When test temperature be 1265 DEG C, Fe2O3Reagent little cake and quick lime little cake contact surface to be tested
The difference that upper product forms circle diameter and quick lime little cake diameter is less than 4mm more than 2mm, then 1265 DEG C are quick lime C
Reaction starting temperature.Reaction starting temperature with same method detection quick lime D is 1278 DEG C.
Found by being detected to quick lime C and D reaction starting temperature, although quick lime C CaO content is slightly below D,
Quick lime C reaction starting temperature is lower than quick lime D 13 DEG C, i.e., in sintering process parameter and iron charge composition under the same conditions,
Quick lime C is easier to react with Iron Ore Powder, and its pyroreaction characteristic is better than quick lime D.
Embodiment 3
Different sources calcium oxide E and quick lime F to be detected, the wherein CaO of calcium oxide E content are 79.2%, calcium oxide E
CaO content be 77.8%；Calcium oxide E and F are ground, its granularity is more than 180 mesh less than 160 mesh；By calcium oxide E and
Compressing F difference is diameter 13mm, quality 5g circular little cake.To Fe2O3Reagent is ground, and its granularity is less than 160 mesh
More than 180 mesh；By Fe2O3It is diameter 21mm that reagent is compressing, quality 9g circular little cake.Quick lime and Fe to be checked2O3Reagent
Compressing pressure be 17MPa, pressing forming time 12min.
By calcium oxide E little cake and Fe2O3Reagent little cake is placed on the sample holder of mini-sintering stove, Fe2O3Reagent little cake exists
Under, quick lime little cake is placed on it, and quick lime little cake is in Fe2O3Reagent little cake center；Start mini-sintering stove, rise
Temperature is tested, and temperature control system is：900 DEG C are raised to 7min by room temperature, and 900 DEG C are raised to 1000 DEG C with 5min, and 1000 DEG C are raised to
1150 DEG C with 7min, then with 14 DEG C/min heating rate to 1280 DEG C, in 1280 DEG C of constant temperature 7min, by 1280 DEG C of drops
Temperature with 9min, powers off Temperature fall, taken out after sample is cooled to room temperature to 1000 DEG C；During experiment, to mini-sintering stove
In be passed through air, air mass flow 5L/min.
Viewing test little cake, Fe2O3It is straight that reagent little cake with product on quick lime little cake contact surface to be tested forms circumference
Footpath and the difference of quick lime little cake diameter are more than 4mm, then Fe2O3Reagent little cake is superfused, and reduces test temperature；Reduce test temperature 8
DEG C, tested again by above-mentioned steps.When test temperature be 1256 DEG C, Fe2O3Reagent little cake and quick lime little cake contact surface to be tested
The difference that upper product forms circle diameter and quick lime little cake diameter is less than 4mm more than 2mm, then 1256 DEG C are calcium oxide E
Reaction starting temperature.Reaction starting temperature with same method detection quick lime F is 1270 DEG C.
Found by being detected to the reaction starting temperature of calcium oxide E and F, the CaO content of calcium oxide E is slightly above F, quick lime
Also 14 DEG C lower than quick lime F of E reaction starting temperature, i.e., in sintering process parameter and iron charge composition under the same conditions, raw stone
Grey E is easier to react with Iron Ore Powder, and its pyroreaction characteristic is better than quick lime F.
Claims (3)
1. a kind of detection method of sintering quick lime pyroreaction characteristic, it is characterised in that comprise the following steps：
(1) by quick lime to be detected it is compressing be 10~15mm of diameter, 3~6g of quality circular little cake；By Fe2O3Reagent
Compressing is 20~25mm of diameter, 8~12g of quality circular little cake；
(2) little cake sample is placed on the sample holder of mini-sintering stove, Fe2O3For reagent little cake under, quick lime little cake is placed in it
On, and quick lime little cake is in Fe2O3Reagent little cake center；
(3) firing test device, heating are tested, and temperature control system is：900 DEG C are raised to 6~10min by room temperature, and 900 DEG C rise
To 1000 DEG C with 3~6min, 1000 DEG C are raised to 1150 DEG C with 5~8min, then with 8 DEG C~15 DEG C/min heating rate
To test temperature, in test temperature 5~8min of constant temperature, 1000 DEG C are cooled to 5~10min, power-off nature drop by test temperature
Temperature, taken out after sample is cooled to room temperature；
(4) viewing test little cake, if Fe2O3Reagent little cake forms circle with product on quick lime little cake contact surface to be tested
The difference of all diameters and quick lime little cake diameter is 2mm~4mm, then this test temperature is quick lime reaction starting temperature；If
Fe2O3Reagent little cake forms circle diameter and quick lime little cake diameter with product on quick lime little cake contact surface to be tested
Difference is more than 4mm, then Fe2O3Reagent little cake is superfused, and reduces test temperature；If Fe2O3Reagent little cake and quick lime to be tested are small
There is no product on cake contact surface, or product forms circle diameter and the difference of quick lime little cake diameter is less than 2mm, then
Fe2O3Reagent little cake does not start to react, and raises test temperature；Test temperature is raised and lowered every time as 3~10 DEG C；
(5) by determining the reaction starting temperature of quick lime, to detect the pyroreaction characteristic of the quick lime.
2. the detection method of sintering quick lime pyroreaction characteristic according to claim 1, it is characterised in that step (1)
Described in quick lime and Fe to be checked2O3Reagent, its granularity is in the mesh of 200 mesh~150；Its compressing pressure is 15~20MPa, pressure
Molding time processed is 10min~20min.
3. the detection method of sintering quick lime pyroreaction characteristic according to claim 1, it is characterised in that step (3)
Described in test during, air is passed through into experimental rig, air mass flow is 3~5L/min.
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|---|---|---|---|---|
| CN102023176A (en) * | 2010-12-13 | 2011-04-20 | 首钢总公司 | Method for acquiring high temperature characteristics of iron ore powder in sintering process |
| CN104250688A (en) * | 2013-06-26 | 2014-12-31 | 宝山钢铁股份有限公司 | Evaluation method of reactivity of quicklime for sintering |
| CN105372273A (en) * | 2015-11-24 | 2016-03-02 | 北京科技大学 | Method for measuring iron ore powder and CaO assimilation reaction performance |
| CN105463188A (en) * | 2015-11-27 | 2016-04-06 | 北京科技大学 | Method for measuring flowing property of iron ore powder sintering liquid phase |
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2016
- 2016-06-30 CN CN201610504867.XA patent/CN107561115A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102023176A (en) * | 2010-12-13 | 2011-04-20 | 首钢总公司 | Method for acquiring high temperature characteristics of iron ore powder in sintering process |
| CN104250688A (en) * | 2013-06-26 | 2014-12-31 | 宝山钢铁股份有限公司 | Evaluation method of reactivity of quicklime for sintering |
| CN105372273A (en) * | 2015-11-24 | 2016-03-02 | 北京科技大学 | Method for measuring iron ore powder and CaO assimilation reaction performance |
| CN105463188A (en) * | 2015-11-27 | 2016-04-06 | 北京科技大学 | Method for measuring flowing property of iron ore powder sintering liquid phase |
Non-Patent Citations (1)
| Title |
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| 吴铿 等: "测定铁矿粉同化特性新方法的探索", 《东北大学学报（自然科学版）》 * |
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Application publication date: 20180109 |