CN113564347B - Method for improving blending degree of sintering-blending mixture - Google Patents
Method for improving blending degree of sintering-blending mixture Download PDFInfo
- Publication number
- CN113564347B CN113564347B CN202110669247.2A CN202110669247A CN113564347B CN 113564347 B CN113564347 B CN 113564347B CN 202110669247 A CN202110669247 A CN 202110669247A CN 113564347 B CN113564347 B CN 113564347B
- Authority
- CN
- China
- Prior art keywords
- water
- sample
- pycnometer
- expressed
- raw materials
- 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.)
- Active
Links
- 238000002156 mixing Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000000203 mixture Substances 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 124
- 239000002994 raw material Substances 0.000 claims abstract description 60
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000000843 powder Substances 0.000 claims abstract description 32
- 229910052742 iron Inorganic materials 0.000 claims abstract description 28
- 238000005245 sintering Methods 0.000 claims abstract description 24
- 230000004907 flux Effects 0.000 claims abstract description 6
- 239000000446 fuel Substances 0.000 claims abstract description 6
- 238000010521 absorption reaction Methods 0.000 claims description 30
- 238000005303 weighing Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 14
- 229920006395 saturated elastomer Polymers 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 10
- 239000012153 distilled water Substances 0.000 claims description 10
- 238000012216 screening Methods 0.000 claims description 10
- 230000005484 gravity Effects 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000004220 aggregation Methods 0.000 abstract description 27
- 239000002245 particle Substances 0.000 abstract description 7
- 230000008569 process Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000008187 granular material Substances 0.000 description 9
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 6
- 239000003830 anthracite Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000010459 dolomite Substances 0.000 description 3
- 229910000514 dolomite Inorganic materials 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- LTINZAODLRIQIX-FBXRGJNPSA-N cefpodoxime proxetil Chemical compound N([C@H]1[C@@H]2N(C1=O)C(=C(CS2)COC)C(=O)OC(C)OC(=O)OC(C)C)C(=O)C(=N/OC)\C1=CSC(N)=N1 LTINZAODLRIQIX-FBXRGJNPSA-N 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000012256 powdered iron Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
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。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110669247.2A CN113564347B (en) | 2021-06-17 | 2021-06-17 | Method for improving blending degree of sintering-blending mixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110669247.2A CN113564347B (en) | 2021-06-17 | 2021-06-17 | Method for improving blending degree of sintering-blending mixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113564347A CN113564347A (en) | 2021-10-29 |
| CN113564347B true CN113564347B (en) | 2023-03-21 |
Family
ID=78162110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110669247.2A Active CN113564347B (en) | 2021-06-17 | 2021-06-17 | Method for improving blending degree of sintering-blending mixture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113564347B (en) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 | A method for producing metalized pellets from iron ore tailings |
| JP6849279B2 (en) * | 2017-02-21 | 2021-03-24 | 株式会社日向製錬所 | How to make briquettes |
| 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 |
| 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 |
| 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 |
-
2021
- 2021-06-17 CN CN202110669247.2A patent/CN113564347B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113564347A (en) | 2021-10-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ouattara et al. | Effects of superplasticizer on rheological properties of cemented paste backfills | |
| Koohestani et al. | Experimental investigation into the compressive strength development of cemented paste backfill containing Nano-silica | |
| Cheng et al. | Effect of particle gradation characteristics on yield stress of cemented paste backfill | |
| Ferraris et al. | The influence of mineral admixtures on the rheology of cement paste and concrete | |
| Paiva et al. | Effect of metakaolin dispersion on the fresh and hardened state properties of concrete | |
| Assaad et al. | Effect of clinker grinding aids on flow of cement-based materials | |
| Aldhafeeri et al. | Sulphate induced changes in the reactivity of cemented tailings backfill | |
| Deng et al. | Influence of particle size on the basic and time-dependent rheological behaviors of cemented paste backfill | |
| Consoli et al. | Eggshell produced limes: Innovative materials for soil stabilization | |
| Fattah et al. | Characteristics of clays stabilized with lime-silica fume mix | |
| CN103342481A (en) | Mine filling cementing material slurry and preparation method thereof | |
| WO2018170767A1 (en) | Ore pellet, preparation method therefor, and preparation equipment | |
| Peng et al. | Preparation of composite micro-slag based on the application of tailings slag in cement and concrete | |
| Haruna et al. | Reactivity of cemented paste backfill containing polycarboxylate-based superplasticizer | |
| Ji et al. | Importance of intensive mixing on sintering with fine-grained iron ore materials: Characterization and function mechanism | |
| CN105948577B (en) | Mix micro mist whole-high valent titanium slag concrete and preparation method thereof | |
| Jiang et al. | Effects of liquidus temperature and liquid amount on the fluidity of bonding phase and strength of sinter | |
| JPH02248350A (en) | Improved pozzolan composition | |
| CN113564347B (en) | Method for improving blending degree of sintering-blending mixture | |
| Shishkin et al. | Study of the effect of micellar catalysis on the strength of alkaline reactive powder concrete | |
| Hu et al. | Key attributes of superfine tailings cemented paste backfill modified with nano-Al2O3: Mechanical properties, flowability, microstructure, and thermal decomposition characteristics | |
| Yu et al. | Relationships between compressive strength and microstructure in mortars with iron ore tailings as fine aggregate | |
| Lesovik et al. | Fine-grain concrete from mining waste for monolithic construction | |
| Salah et al. | Improvement of the mechanical properties of the cement mortar by the incorporation of silica particles with low and high surface area | |
| Mashifana | Beneficiation of Barberton gold mine tailings: the effect of fly ash on the mineralogy and micrograph |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |