CN113564347B - Method for improving blending degree of sintering-blending mixture - Google Patents
Method for improving blending degree of sintering-blending mixture Download PDFInfo
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Abstract
A method for improving the blending degree of a sintering-blending mixture is characterized by controlling the following two aspects: controlling the upper limit value of the water content of various raw materials, namely iron ore powder, flux and fuel, entering a primary mixer; the time for starting to add water in the sintering primary mixer is controlled as follows: adding all the raw materials into a mixer at one time, and then adding water into the mixer within 30-90 s of operation, wherein the water content is 5-10% of the total raw materials. The invention can reduce the self-aggregation particles in the mixture by more than 80 percent, improve the uniform mixing degree of the sintering-mixing mixture, and has strong feasibility when being used on the basis of the prior art; the method is simple to operate, convenient to implement, capable of using historical data and high in operability.
Description
Technical Field
The invention relates to the technical field of sintered pellets, and particularly belongs to a method for improving the uniform mixing degree of a sintered-mixed material.
Background
The degree of blending of the sinter mix is critical to sintering. The sintering fluctuation degree, the stability of the chemical components of the sintering minerals and the like are related. This affects not only the sintering process itself but also the blast furnace smelting. The research shows that the literature 'practice of improving the blending mineral content' and the literature 'analysis and countermeasure for influencing the blending effect of sintering raw materials' indicate that: at present, in order to improve the uniformity degree of the mixture, many companies establish a blending stock ground under the condition of condition, which plays a great role in improving the blending ore (namely the blending of various iron ore powders) of the sintering raw material. However, the research of ' the influence of the proportion of the weak magnetic concentrate in the harbor in the Wuhan Steel industry ' on the blending effect ' finds that when the water content of the iron ore powder is high, the iron ore powder is easy to generate self-aggregation before blending and stacking and in the stacking process, and self-aggregation particles are difficult to disperse in the subsequent transportation, blending and granulating processes, so that the blending degree of the mixture is influenced, and the same phenomenon also exists when the water content of other raw materials is too high. In companies which do not establish a blending yard under the condition, the self-aggregation phenomenon has larger influence and the blending effect of the mixture is poorer. At present, the application of a lining integration technology in a sintering mixer in the literature indicates that measures for improving the mixing effect of mixture materials in the sintering process are all improvements of mixing equipment, and the improvement measures of lining materials or lining structures and the like of a primary mixer are more, and the comparison of the sintering, mixing and granulating processes in the literature indicates that a powerful mixer is added in front of the primary mixer in a few sintering plants, and the measures have certain improvement effects on the aspect of strengthening the mixing effect of the mixture materials, and particularly the effect of strengthening the powerful mixer in front of the primary mixer is more remarkable. However, the measures have poor redispersion effect on particles which form self-aggregation, and the document "measures for improving the mixture uniformity and strengthening the distribution" indicates that the measure taken by climbing steel for solving the phenomenon of self-aggregation generated by large concentrate water is to add a material disperser to scatter the self-aggregation particles to obtain a certain effect, but the self-aggregation phenomenon cannot be fundamentally eliminated, and the method for improving the mixing degree of the sintering-mixing mixture is provided for solving the problem that the self-aggregation particles of the sintering raw material influence the mixing degree of the sintering mixture.
Disclosure of Invention
The invention aims to solve the problems that self-aggregation agglomeration easily occurs when the moisture content of a sintering raw material is too high, and aggregation blocks are not easy to disperse in the transferring and uniformly mixing processes, so that the uniformly mixing degree of a sintering mixture is poor after primary mixing, and provides a method for reducing self-aggregation particles of the sintering raw material by more than 80 percent so as to improve the uniformly mixing degree of a primary mixed material.
The measures for realizing the aim are as follows:
a method for improving the blending degree of a sintering-blending mixture comprises the following steps: the control is carried out from the following two aspects:
1) Controlling the upper limit value of the water content of various raw materials, namely iron ore powder, flux and fuel, entering a primary mixer;
2) The time for starting to add water in the sintering primary mixer is controlled as follows: adding all the raw materials into a mixer at one time, and then adding water into the mixer within 30-90 s of operation, wherein the water content is 5-10% of the total raw materials.
It is characterized in that: the upper limit values of the iron ore powder, the flux and the water content in the fuel are obtained by calculation according to the following steps:
1) Sample preparation:
a. drying the raw materials for the test: the sampling amount of each raw material sample is not less than 1kg, and the raw material samples are dried at the temperature of not less than 100 ℃, the drying time is not less than 2 hours, and the drying is carried out until the water content is less than or equal to 0.05wt%;
b. screening the dried raw materials: screening out a sample with the granularity less than 0.5mm for later use;
2) Measuring the maximum capillary water of the sample to be used in the step 1) by adopting a saturated water absorption method, and the method comprises the following steps:
a. naturally stacking the sample to be used in the step 1) in a test tube, wherein the stacking thickness of a material layer is 100mm, and recording the weight of the used sample, which is expressed by G and has the unit of G;
b. the water absorption is saturated and the water absorption is recorded, using G Water (W) Expressed in units of g;
c. the maximum capillary water, expressed in M and in wt%,
the calculation formula is as follows: m = G Water (W) /(G Water (W) +G)*100 wt% ；
3) Measuring the water absorption weight of the sample to be used per unit weight in 1) for 1 hour by adopting a specific gravity bottle drainage method, and comprising the following steps:
a. weighing the sample to be used in the step 1), putting the sample into a pycnometer until the sample is about one third of the height of the pycnometer, recording the weight of the sample, and using m 0 Expressed in units of g;
b. adding distilled water into the specific gravity bottle filled with the sample to full, weighing the specific gravity bottle, and weighing the specific gravity bottle by m 1 Expressed in units of g;
c. standing for 1h;
d. stirring in the pycnometer until bubbles in the pycnometer are removed;
e. adding distilled water into the pycnometer, weighing, and adding water to desired volume 2 Expressed in units of g;
f、calculating the 1h water absorption weight X of the unit weight sample 1h In wt%, calculated by the formula:
X 1h =(m 2 -m 1 )/(m 0 +m 2 -m 1 )*100 wt%；
4) The water absorption weight per unit weight of the sample to be used in 1) was measured by a pycnometer drainage method for 24 hours: the determination steps are the same as the step 3), except that the standing time is 24h, and the calculated value is X 24h Expressed in units of wt%;
5) Calculating the upper limit value of the moisture control of each raw material, using W Limit of Expressed in wt%: is calculated by the formula
W Limit of =X 24h +（M-X 1h ）*0.4。
The main process of the invention has the following functions and mechanisms:
the upper limit of the water content in the raw materials, i.e. iron ore powder, flux and fuel, entering the primary mixer is controlled so that the sintered raw materials do not self-aggregate before being dispersed. The upper limit value of the water content of each raw material which does not generate the self-aggregation phenomenon is the relationship between the upper limit value of the water content of the sintering raw material which does not generate the self-aggregation and the factor after the self-aggregation factor is analyzed through a mechanism, and then a calculation formula of the upper limit value of the water content is determined, and the water content of each raw material for sintering is controlled according to the upper limit value.
The invention is characterized in that: and controlling the raw materials to be added all at once, then operating the mixer, and adding water within 30-90 s, wherein the added water amount is based on the principle that the water content of all the raw materials is 5-10%, because the self-aggregation of the raw materials needs to meet two conditions, one condition is full contact, the other condition is self-aggregation water, and the water adding time is controlled to destroy the self-aggregation condition, so that the sintering raw materials are dispersed before meeting the self-aggregation water condition.
Compared with the prior art, the invention can reduce the self-aggregation particles in the mixture by more than 80 percent, improve the uniform mixing degree of the sintering-mixing mixture, and has strong feasibility when used on the basis of the prior art; the method is simple to operate, convenient to implement, capable of using historical data and high in operability.
Drawings
FIG. 1 is a state diagram of a self-aggregation phenomenon;
FIG. 2 is a diagram showing a state after crushing in the self-aggregation phenomenon;
FIG. 3 is a state diagram of the case where there is no self-aggregation phenomenon;
FIG. 4 is a diagram showing a state after crushing in the absence of self-aggregation.
Detailed Description
The present invention is described in detail below:
example 1
The raw materials of this example consisted of: anthracite, limestone, iron ore powder Yang Di, iron ore powder button powder, iron ore powder MAC and iron ore powder card powder in the wing;
a method for improving the blending degree of a sintering-blending mixture comprises the following steps: the control is carried out from the following two aspects:
(1) Controlling the upper limit value of the moisture contained in various raw materials in the composition of the raw materials in the embodiment of the primary mixer;
(2) The time for starting to add water in the sintering primary mixer is controlled as follows: after all the raw materials were added all at once, water was added to the mixer for another 30s so that the moisture content of all the raw materials was 6.6%.
In this example, the upper limit of the water content of the raw materials in the composition of the raw materials is obtained by calculating the following steps: anthracite in the first made wing;
1) Sample preparation:
a. drying anthracite in the tested wing: taking 1.5kg of sample, and drying at 104 ℃ for 2.5 hours until the water content is 0.01wt%;
b. screening anthracite in the dried wings: screening out a sample with the granularity less than 0.5mm for later use;
2) Adopting a cylindrical saturated water absorption test tube with the diameter of 15mm to measure the maximum capillary water of the sample to be used in the step 1) by a saturated water absorption method, and comprising the following steps:
a. naturally stacking the sample to be used in 1) in a test tube, wherein the stacking thickness of the material layer is 100mm, and recording the weight of the sample to be used as 79.321G which is indicated by G;
b. the water absorption was saturated and recorded as 13.130G, using G Water (W) Represents;
c. calculating the maximum capillary water M by adopting the following formula;
M=G water (W) /(G Water (W) +G)*100=13.130/(13.130+79.321)*100=14.20 wt% ；
3) Measuring the water absorption weight of the sample to be used in the step 1) for 1 hour by adopting a 25ml pycnometer drainage method, and comprising the following steps:
a. weighing the sample to be used in the step 1) and filling the sample into a pycnometer till the sample is one third of the height of the pycnometer, recording the weight of the sample as 12.541g in m 0 Representing;
b. adding distilled water into the pycnometer filled with the sample to full, weighing 47.613g, and weighing m 1 Represents;
c. standing for 1h;
d. stirring in the pycnometer until bubbles in the pycnometer are removed;
e. adding distilled water into the pycnometer, weighing 47.677g, and weighing m 2 Represents;
f. calculating the 1h water absorption weight X of the unit weight sample 1h In wt%, the calculation formula:
X 1h =（m 2 -m 1 ）/(m 0 +m 2 -m 1 )*100=(47.677-47.613)/(12.541+47.677-47.613)*100=0.51 wt%
4) The 24h water absorption weight of the sample to be used per unit weight in 1) was determined using a 25ml pycnometer drainage method: the determination steps are the same as the step 3), except that the standing time is 24h, and the calculated value is X 24h Is represented by X 24h =1.03 wt%。
5) Calculating the upper limit value of water content control of anthracite in the wing, using W Limit of Expressed in wt%: is calculated by the formula
W Limit of =X 24h +（M-X 1h ）*0.4=1.03+（14.20-0.51）*0.4=6.51 wt%。
The water control upper limit values of the other raw materials are calculated according to the steps to obtain the following:
the upper limit value of the moisture control of the limestone is W Limit of =X 24h +（M-X 1h ）*0.4=1.11+（15.42-0.59）*0.4=7.04，
The upper limit value of the water content of the iron ore powder Yang Di is W Limit of =X 24h +（M-X 1h ）*0.4=1.75+（20.93-1.12）*0.4=9.67，
The upper limit value of the moisture control of the iron ore powder is W Limit of =X 24h +（M-X 1h ）*0.4=1.28+（18.56-0.55）*0.4=8.48，
The upper limit value of the water content control of the iron ore powder MAC is W Limit of =X 24h +（M-X 1h ）*0.4=1.58+（19.42-0.77）*0.4=9.04，
The upper limit value of the water content control of the iron ore powder stuck powder is W Limit of =X 24h +（M-X 1h ）*0.4=1.17+（13.49-0.54）*0.4=6.35；
It should be noted that: the sampling amount of each raw material is 1.5kg, and the adopted test processes are the same;
after tests, 30 granules of 3-5mm size fraction were taken from a mixed material, and observed after crushing the granules, no granules having self-aggregation were found.
Example 2
The raw materials of this example consisted of: coke powder, dolomite, powdered iron ore, FMG
A method for improving the blending degree of a sintering-blending mixture comprises the following steps: the control is carried out from the following two aspects:
(1) Controlling the upper limit value of the moisture contained in each raw material in the raw material composition of the embodiment of the primary mixer;
(2) The time for starting to add water in the sintering primary mixer is controlled as follows: after all the raw materials were added all at once, water was added to the mixer for another 40s so that the water content of all the raw materials was 7.0%.
In this example, the upper limit of the water content of the raw materials in the composition of the raw materials is obtained by calculating the following steps:
1) Sample preparation:
a. drying iron ore powder used for the test: taking 2.5kg of sample, and drying at 105 ℃ for 4 hours until the water content is 0.02wt%;
b. screening the dried iron ore powder at the south of the Yangtze river: screening out a sample with the granularity less than 0.5mm for later use;
2) Adopting a cylindrical saturated water absorption test tube with the diameter of 15mm to measure the maximum capillary water of the sample to be used in the step 1) by a saturated water absorption method, and comprising the following steps:
a. naturally stacking the sample to be used in the step 1) in a test tube, wherein the stacking thickness of a material layer is 100mm, and recording the weight of the sample to be used as 137.183G which is indicated by G;
b. the water absorption was saturated and recorded as 25.490, using G Water (W) Expressed in units of g;
c. the maximum capillary water, expressed in M, in wt%,
the calculation formula is as follows: m = G Water (W) /(G Water (W) +G)*100=25.490/(25.490+137.183)*100=15.67 wt%；
3) The water absorption weight of the sample to be used in 1) per unit weight is measured by a 25ml pycnometer drainage method for 1 hour, and the method comprises the following steps:
a. weighing the sample to be used in the step 1) and filling the sample into a pycnometer till the sample is about one third of the height of the pycnometer, recording the weight of the sample as 28.213g in m 0 Represents;
b. adding distilled water into the pycnometer filled with the sample to full, weighing the pycnometer to 62.617 by m 1 Expressed in units of g;
c. standing for 1h;
d. stirring in the pycnometer until bubbles in the pycnometer are removed;
e. adding distilled water into the pycnometer, weighing 62.792, and weighing m 2 Expressed in units of g;
f. calculating the 1h water absorption weight X of the unit weight sample 1h In wt%, the calculation formula:
X 1h =（m 2 -m 1 ）/(m 0 +m 2 -m 1 )*100=(62.792-62.617)/(28.213+62.792-62.617)*100=0.62 wt%；
4) The 24h water absorption weight of the sample to be used per unit weight in 1) was determined using a 25ml pycnometer drainage method: the determination steps are the same as the step 3), except that the standing time is 24h, and the calculated value is X 24h Is represented by X 24h =1.30 wt%；
5) Calculating the upper limit value of the water content in the iron ore powder Banan, and using W Limit of Expressed in wt%: is calculated by the formula
W Limit for =X 24h +（M-X 1h ）*0.4=1.30+（15.67-0.62）*0.4=7.32 wt%；
The water control upper limit values of the other raw materials are calculated according to the steps to obtain the following:
the upper limit value of the moisture control of the coke powder is W Limit of =X 24h +（M-X 1h ）*0.4=0.27+（13.24-0.12）*0.4=5.52，
The water content control upper limit value of dolomite is W Limit for =X 24h +（M-X 1h ）*0.4=1.19+（15.94-0.61）*0.4=7.32，
The upper limit value of the water content control of the iron ore powder haydite is W Limit of =X 24h +（M-X 1h ）*0.4=1.59+（13.95-0.93）*0.4=6.80，
The upper limit value of the water content control of the iron ore powder crude powder is W Limit of =X 24h +（M-X 1h ）*0.4=1.39+（11.86-0.88）*0.4=5.78，
The upper limit value of the moisture control of the iron ore powder FMG is W Limit of =X 24h +（M-X 1h ）*0.4=1.42+（20.78-0.78）*0.4=9.42；
It should be noted that: the sampling amount of each raw material is 2.5kg, and the adopted test processes are the same;
after the test, 50 granules with the size fraction of 3-5mm are taken out from the mixed material, and the granules are crushed and observed, and no granules with self-aggregation are found.
Example 3
The raw materials of this example consisted of: the method for improving the mixing degree of the sintering-mixing mixture comprises the following steps of: the control is carried out from the following two aspects:
(1) Controlling the upper limit value of the moisture contained in each raw material in the raw material composition of the embodiment of the primary mixer;
(2) The time for starting to add water in the sintering primary mixer is controlled as follows: after all the raw materials were added all at once, water was added at the time when the mixer was operated for another 45 seconds so that the moisture content of all the raw materials was 6.3%.
In the present example, the upper limit value of the water content in the raw material composition is obtained by the following steps:
1) Sample preparation:
a. drying the south Africa of the iron ore powder for the test: taking 3.0kg of sample, and drying at 106 ℃ for 4 hours until the water content is 0.01wt%;
b. screening the dried iron ore powder south Africa: screening out a sample with the granularity less than 0.5mm for later use;
2) Adopting a cylindrical saturated water absorption test tube with the diameter of 15mm to measure the maximum capillary water of the sample to be used in the step 1) by a saturated water absorption method, and comprising the following steps:
a. naturally stacking the sample to be used in 1) in a test tube, wherein the stacking thickness of the material layer is 100mm, and recording the weight of the sample to be used as 178.782G which is indicated by G;
b. the water absorption was saturated and recorded as 23.640, using G Water (I) Expressed in units of g;
c. the maximum capillary water, expressed in M and in wt%,
the calculation formula is as follows: m = G Water (W) /(G Water (W) +G)*100=23.640/(23.640+178.782)*100=11.68 wt%；
3) The water absorption weight of the sample to be used in 1) per unit weight is measured by a 25ml pycnometer drainage method for 1 hour, and the method comprises the following steps:
a. weighing the sample to be used in the step 1) and filling the sample into a pycnometer till the sample is about one third of the height of the pycnometer, recording the weight of the sample as 34.657 in m 0 Expressed in units of g;
b. adding distilled water into the pycnometer filled with the sample to full, weighing the pycnometer to 68.415 by m 1 Expressed in units of g;
c. standing for 1h;
d. stirring in the pycnometer until bubbles in the pycnometer are removed;
e. adding distilled water into the pycnometer, weighing 68.447, and weighing m 2 Expressed in units of g;
f. calculating the 1h water absorption weight X of the unit weight sample 1h In wt%, the calculation formula:
X 1h =（m 2 -m 1 ）/(m 0 +m 2 -m 1 )*100=(68.447-68.415)/(34.657+68.447-68.415)*100=0.09 wt%
4) The 24h water absorption weight of the sample to be used per unit weight in 1) was determined using a 25ml pycnometer drainage method: the determination steps are the same as the step 3), except that the standing time is 24h, and the calculated value is X 24h Is represented by X 24h =0.23 wt%。
5) Calculating the upper limit value of the water content control of the south Africa of the iron ore powder by using W Limit of Expressed in wt%: is calculated by the formula
W Limit of =X 24h +（M-X 1h ）*0.4=0.23+（11.68-0.09）*0.4=4.87 wt%。
The water control upper limit values of the other raw materials are calculated according to the steps as follows:
the upper limit value of the moisture control of the coke anthracite is W Limit for =X 24h +（M-X 1h ）*0.4=1.62+（16.74-0.73）*0.4=8.02 wt%，
The upper limit value of the moisture control of the self-produced dolomite is W Limit of =X 24h +（M-X 1h ）*0.4=1.48+（15.41-0.76）*0.4=7.34 wt%，
The upper limit value of the water content control of the iron ore powder PB is W Limit of =X 24h +（M-X 1h ）*0.4=1.53+（18.69-0.81）*0.4=8.68 wt%，
Upper limit value of water content control of iron ore powder kingIs W Limit of =X 24h +（M-X 1h ）*0.4=1.94+（17.83-1.43）*0.4=8.50 wt%；
It should be noted that: the sampling amount of each raw material is 3.0kg, and the adopted test processes are the same;
after the test, 40 granules with the size fraction of 3-5mm are taken out from a mixed material, and the granules are crushed and observed, and no granules with self-aggregation are found.
The above examples are merely preferred examples and are not intended to be exhaustive of the invention.
Claims (1)
1. A method for improving the blending degree of a sintering-blending mixture is characterized in that: the control is carried out from the following two aspects:
(1) Controlling the upper limit value of the water content of various raw materials, namely iron ore powder, flux and fuel, entering a primary mixer;
(2) The time for starting water adding of the sintering primary mixer is controlled as follows: adding all the raw materials into a mixer once, and then adding water into the mixer within 30-90 s of operation, wherein the added water amount is based on the principle that the water content of all the raw materials is 5-6.6%;
the upper limit value of the water content in the iron ore powder, the flux and the fuel is calculated according to the following steps:
1) Sample preparation:
a. drying the raw materials for the test: the sampling amount of each raw material sample is not less than 1kg, and the raw material samples are dried at the temperature of not less than 100 ℃, the drying time is not less than 2 hours, and the drying is carried out until the water content is less than or equal to 0.05wt%;
b. screening the dried raw materials: screening out a sample with the granularity of less than 0.5mm for later use;
2) Measuring the maximum capillary water of the sample to be used in the step 1) by adopting a saturated water absorption method, and the method comprises the following steps:
a. naturally stacking the sample to be used in the step 1) in a test tube, wherein the stacking thickness of a material layer is 100mm, and recording the weight of the used sample, which is expressed by G and has the unit of G;
b. the water absorption is saturated and the water absorption is recorded, using G Water (W) Expressed in units of g;
c. calculating the maximum capillary water, expressed as M, in wt%;
the calculation formula is as follows: m = G Water (W) /(G Water (W) +G)*100 wt%
3) Measuring the water absorption weight of the sample to be used per unit weight in 1) for 1 hour by adopting a pycnometer drainage method, and comprising the following steps of:
a. weighing the sample to be used in the step 1), putting the sample into a pycnometer until the sample is one third of the height of the pycnometer, recording the weight of the sample, and using m 0 Expressed in units of g;
b. adding distilled water into the specific gravity bottle filled with the sample to full, weighing the specific gravity bottle, and weighing the specific gravity bottle by m 1 Expressed in units of g;
c. standing for 1h;
d. stirring in the pycnometer until bubbles in the pycnometer are removed;
e. adding distilled water into the pycnometer, weighing, and adding 2 Expressed in units of g;
f. calculating the 1h water absorption weight X of the unit weight sample 1h In wt%, the calculation formula:
X 1h =(m 2 -m 1 )/(m 0 +m 2 -m 1 )*100 wt%
4) The water absorption weight per unit weight of the sample to be used in 1) was measured by a pycnometer drainage method for 24 hours: the determination steps are the same as the step 3), except that the standing time is 24h, and the calculated value is X 24h Expressed in units of wt%;
5) Calculating the upper limit value of the moisture control of each raw material, using W Limit of Expressed in wt%: is calculated by the formula
W Limit of =X 24h +（M-X 1h ）*0.4。
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| CN101701289A (en) * | 2009-09-29 | 2010-05-05 | 武汉钢铁(集团)公司 | Method for intensifying limonite sintering |
| DE102012011240A1 (en) * | 2012-06-06 | 2013-12-12 | Outotec Oyj | Process for producing hardened granules from iron-containing particles |
| CN103103346A (en) * | 2013-01-08 | 2013-05-15 | 内蒙古包钢钢联股份有限公司 | Recycling method for calcium-free chromium slag sintered building block |
| CN103215443B (en) * | 2013-05-21 | 2014-04-23 | 唐山瑞丰钢铁（集团）有限公司 | High-ore-matching-ratio brown iron ore sintering technology |
| CN106755981B (en) * | 2016-11-25 | 2019-07-19 | 江苏省沙钢钢铁研究院有限公司 | Method for producing metallized pellets by using iron ore tailings |
| JP6849279B2 (en) * | 2017-02-21 | 2021-03-24 | 株式会社日向製錬所 | How to make briquettes |
| CN107881336A (en) * | 2017-11-19 | 2018-04-06 | 东北大学 | A kind of method that low chromium type vanadium titano-magnetite prepares pellet with addition of chromite |
| CN107937715A (en) * | 2017-11-19 | 2018-04-20 | 东北大学 | A kind of method that high-chromic vanadium-titanium ferroferrite prepares pellet with addition of chromite |
| CN108897981A (en) * | 2018-06-29 | 2018-11-27 | 武钢集团昆明钢铁股份有限公司 | Blending ore is kept to do, wet feed matches consistent method |
| CN111763822A (en) * | 2019-04-02 | 2020-10-13 | 上海梅山钢铁股份有限公司 | Method for producing sintered ore from superfine iron concentrate powder |
| CN110499419B (en) * | 2019-08-30 | 2021-01-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Sintering method using ultrafine-grained vanadium-titanium concentrate |
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