CN106435170B - A kind of Basic Pellets preparation method and preparation and mineral powder mixed material used - Google Patents
A kind of Basic Pellets preparation method and preparation and mineral powder mixed material used Download PDFInfo
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- CN106435170B CN106435170B CN201610875078.7A CN201610875078A CN106435170B CN 106435170 B CN106435170 B CN 106435170B CN 201610875078 A CN201610875078 A CN 201610875078A CN 106435170 B CN106435170 B CN 106435170B
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- 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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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- 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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
Abstract
The invention discloses a kind of Basic Pellets preparation method and prepare mineral powder mixed material used, applied to blast furnace field of metallurgy, wherein, Basic Pellets preparation method includes: that calcium hydroxide and sodium-ionized bentonite are mixed into calcium hydroxide mixture, in calcium hydroxide mixture: the mass percent of calcium hydroxide is 96%~98%, and the mass percent of sodium-ionized bentonite is 2%~4%；Calcium hydroxide mixture is incorporated in concentrate powder and is mixed into mineral powder mixed material, in mineral powder mixed material: the mass percent of concentrate powder is 95%~99%, and the mass percent of calcium hydroxide mixture is 1%~5%；Sieve takes the green-ball of release mesh to be fired technique after mineral powder mixed material is prepared green-ball, to obtain Basic Pellets.It solves pellet lower technical problem of use ratio in blast furnace process through the invention, and then improves pellet and enter furnace ratio, improve blast furnace process index.
Description
Technical field
The present invention relates to blast furnace field of metallurgy more particularly to a kind of Basic Pellets preparation method and preparation miberal powder used are mixed
Close material.
Background technique
China's iron ore deposit is mostly lean ore, and rich ore is seldom.Useful raw materials are mainly thin concentrate, and rich fine ore and lump ore are seldom.
In this case, this is preferably produced based on pelletizing, but due to historical reasons, China's blast furnace is always main former with high-basicity sintering
Material, then a small amount of acidic pellet ore of arranging in pairs or groups.It is continuously increased the increasingly promotion required with energy conservation and environmental protection with BF Burden Materials Preparation demand,
Developing pellet becomes trend.Pellet has many advantages, such as that grade is high, gangue content is low, epigranular and intensity are good.
Pellet production capacity in China's has had reached 200,000,000 tons at present, but what is mainly produced is general acidic pellet.Acid ball
Nodulizing is the pellet of natural alkalinity, SiO2And Al2O3Comparision contents are high, and the content of the alkaline matters such as calcium and magnesium is seldom, therefore existing
There is the of low quality of the pellet of technology production, in order to which the basicity of slag balanced in blast furnace will limit the use ratio of pellet,
Therefore pellet use ratio in blast furnace process is lower, is unfavorable for environmental protection.
Summary of the invention
The embodiment of the present invention is solved by providing a kind of Basic Pellets preparation method and preparing mineral powder mixed material used
Pellet lower technical problem of use ratio in blast furnace process.
In a first aspect, the embodiment of the invention provides a kind of Basic Pellets preparation methods, comprising: by calcium hydroxide and sodium
Bentonite is mixed into calcium hydroxide mixture, wherein in the calcium hydroxide mixture: the mass percent of the calcium hydroxide
It is 96%~98%, the mass percent of the sodium-ionized bentonite is 2%~4%；The calcium hydroxide mixture is incorporated concentrate
Mineral powder mixed material is mixed into powder, wherein in the mineral powder mixed material: the mass percent of the concentrate powder is 95%
~99%, the mass percent of the calcium hydroxide mixture is 1%~5%；The mineral powder mixed material is prepared to sieve after green-ball and is taken
The green-ball of release mesh is fired technique, to obtain Basic Pellets.
Preferably, the Ca (OH) of the calcium hydroxide2Content > 92%, the content of grain diameter≤44 μm in the calcium hydroxide
>=90%.
Preferably, water absorption rate >=700% of the sodium-ionized bentonite.
Preferably, it is described the mineral powder mixed material prepared into sieve after green-ball the green-ball of release mesh taken to carry out roasting include:
The mineral powder mixed material makes green-ball in disc balling machine；Sieve takes the green-ball of 9~16mm of granularity through the roasting technique, wherein
The roasting technique includes the forced air drying successively carried out, exhausting drying, preheating, preheating, roasting, soaking and cooling, wherein
The temperature of the preheating is 500~650 DEG C.
Preferably, the forced air drying carries out 3 minutes at 300~350 DEG C of temperature；The exhausting it is dry temperature 350~
450 DEG C carry out 4~5 minutes；The preheating carries out 5~6 minutes；The preheating carries out 5~6 points at 700~1000 DEG C of temperature
Clock；The roasting carries out 8~10 minutes at 1240~1260 DEG C of temperature.
Preferably, the soaking carries out 2~3 minutes at 1150 DEG C.
Second aspect prepares the mining mineral powder mixed material of Alkalinous pelletizing, including following matter the embodiment of the invention discloses a kind of
The each component of amount percentage: calcium hydroxide 0.96%~4.9%, sodium-ionized bentonite 0.02%~0.2%, concentrate powder 95%~
99%.
One or more technical solution provided in an embodiment of the present invention, at least realizes following technical effect or advantage:
Calcium hydroxide and sodium-ionized bentonite are mixed into calcium hydroxide mixture due to first passing through, calcium hydroxide is mixed in calcium hydroxide
Close material in mass percent be 96%~98%, mass percent of the sodium-ionized bentonite in calcium hydroxide mixture be 2%~
4%, wherein 96%~98% calcium hydroxide is high with addition of the proportion of sodium-ionized bentonite in pellet is greatly reduced, to reduce
SiO2And Al2O3Content, while calcium hydroxide will be decomposed in the pre- warm-up phase of roasting technique, therefore to pellet roasting intensity
Influence it is small, then will calcium hydroxide mixture be incorporated concentrate powder in be mixed into mineral powder mixed material, concentrate powder is in mineral powder mixed material
Mass percent is 95%~99%, therefore is alkaline components there are also 1%~5% calcium hydroxide mixture, to effectively improve
The basicity of pellet, is able to produce out Basic Pellets, so that it is lower to solve pellet use ratio in blast furnace process
The technical issues of, and then Basic Pellets can improve pellet in blast furnace process and enter furnace ratio, improve blast furnace process index.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the flow chart of neutral and alkali of embodiment of the present invention pellet preparation method.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a kind of Basic Pellets preparation method, applied to preparing Basic Pellets.With reference to Fig. 1
Shown, Basic Pellets preparation method provided in an embodiment of the present invention includes the following steps:
S1, calcium hydroxide and sodium-ionized bentonite are mixed into calcium hydroxide mixture, wherein calcium hydroxide is mixed in calcium hydroxide
Mass percent in material is 96%~98%, mass percent of the sodium-ionized bentonite in calcium hydroxide mixture be 2%~
4%.
Specifically, in S1: be first (96~98) according to the mass ratio of calcium hydroxide and sodium-ionized bentonite: (4~2), which weigh, to disappear
Weighed calcium hydroxide and sodium-ionized bentonite are mixed into calcium hydroxide mixture by lime and sodium-ionized bentonite.
Specifically, the Ca (OH) of calcium hydroxide used in the present embodiment2Content > 92%, the content of grain diameter≤44 μm
>=90%.Water absorption rate >=700% of sodium-ionized bentonite used in the present embodiment.To fine-grained calcium hydroxide and high performance
The use of sodium-ionized bentonite improves the quality of the Basic Pellets of preparation.
S1 followed by carry out S2, will calcium hydroxide mixture be incorporated concentrate powder in be mixed into mineral powder mixed material,
In, mass percent of the concentrate powder in mineral powder mixed material is 95%~99%, and calcium hydroxide mixture is in mineral powder mixed material
Mass percent is 1%~5%.
Specifically, in S2: be (95~99) according to the mass ratio of concentrate powder and calcium hydroxide mixture: (5~1) weigh essence
Miberal powder and calcium hydroxide mixture, then weighed concentrate powder and calcium hydroxide mixture are mixed into mineral powder mixed material.To logical
Above-mentioned steps S1~S2 preparation mineral powder mixed material is crossed, and is calcium hydroxide and sodium swelling that first uniformly mixed usage amount is less
Soil, then the calcium hydroxide mixture of formation is mixed with the biggish concentrate powder of usage amount, it can more rapidly stir and be stirred in concentrate powder
Mix uniform calcium hydroxide, sodium-ionized bentonite.
Further, in the specific implementation process, if moisture < 7% by mineral powder mixed material made of S2, suitably
With addition of moisture, control the moisture of mineral powder mixed material 7%~7.5%, if meeting moisture by mineral powder mixed material made of S2
7%~7.5%, then no longer with addition of moisture.
S3, mineral powder mixed material is prepared to sieve after green-ball the green-ball of release mesh is taken to be fired technique, to obtain Alkalinous pelletizing
Mine.
Specifically, in S3: mineral powder mixed material makes green-ball in disc balling machine, specifically, setting release mesh is grain
9~16mm is spent, then the green-ball that sieve takes out 9~16mm of granularity after making green-ball is fired technique, wherein roasting technique includes successively
Forced air drying, exhausting drying, preheating, preheating, roasting, soaking and the cooling of progress, to obtain Basic Pellets.Certainly, exist
May be set to be other ranges in specific implementation process is release mesh.
Specifically, mineral powder mixed material carries out making green-ball 12 minutes or so in disc balling machine.
Specifically, the temperature preheated is 500~650 DEG C.To which calcium hydroxide can just be decomposed in pre- warm-up phase, thus
Avoid influence of the calcium hydroxide in subsequent roasting.
Specifically, forced air drying carries out 3 minutes at 300~350 DEG C of temperature.Specifically, exhausting it is dry temperature 350~
450 DEG C carry out 4~5 minutes.Specifically, preheating carries out 5~6 minutes.Specifically, preheating carries out 5 at 700~1000 DEG C of temperature
~6 minutes.Specifically, roasting carries out 8~10 minutes at 1240~1260 DEG C of temperature.Specifically, soaking 1150 DEG C carry out 2~
3 minutes.
Multiple embodiments of Basic Pellets preparation method provided in an embodiment of the present invention are given below:
Embodiment 1
Calcium hydroxide and sodium-ionized bentonite are mixed into calcium hydroxide mixture with mass ratio 96:4, then by concentrate powder be made
Calcium hydroxide mixture mineral powder mixed material is mixed into mass ratio 95:5, then with being mixed with water with by mineral powder mixed material
Moisture adjust to 7.3%.For example, weigh 0.288kg calcium hydroxide and 0.012kg sodium-ionized bentonite to be mixed into calcium hydroxide mixed
Material is closed, then manufactured calcium hydroxide mixture is incorporated in weighed 9.7kg kg concentrate powder and is mixed into mineral powder mixed material.
Mineral powder mixed material makes green-ball 12 minutes in disc balling machine, make after green-ball with sieve sieve take granularity 9~
The green-ball of 16mm, carry out following roasting technique using green-ball of the roasting cup to 9~16mm of granularity that sieve takes: green-ball is first in temperature
330 DEG C progress forced air drying 3 minutes, it is then 4 minutes dry in 400 DEG C of exhausting of temperature, then 550 DEG C pre- preheating 5 minutes, connect
850 DEG C preheat 5 minutes, then 1255 DEG C roast 8 minutes, then 1150 DEG C soaking 3 minutes；Then the ball after soaking
Group obtains Basic Pellets to 150 DEG C or less with room temperature air cooling.
Index such as the following table 1 of Basic Pellets prepared by embodiment 1:
The index of Basic Pellets and existing acidic pellet ore in 1. embodiment 1 of table compares
| Chemical component | TFe | SiO2 | CaO | MgO | Al2O3 | B2 | Compression strength |
| Basic Pellets | 65.26% | 2.0% | 2.23% | 0.48% | 0.36% | 1.11% | 2785N/P |
| Existing acidic pellet ore | 65.92% | 3.1% | 0.31% | 0.48% | 0.35% | 0.14% | 2759N/P |
Seen from table 1, Basic Pellets SiO prepared by embodiment 12Content is 1.1 hundred lower than existing acidic pellet ore
Branch, " TFe+CaO " content is 1.57 percentage points higher than existing acidic pellet ore, Basic Pellets basicity prepared by embodiment 1
Reach 1.1.
Embodiment 2:
Calcium hydroxide and sodium-ionized bentonite are mixed into calcium hydroxide mixture with mass ratio 98:2, then by concentrate powder be made
Calcium hydroxide mixture with quality be that 99:1 is mixed into mineral powder mixed material, then with being mixed with water with by mineral powder mixed material
Moisture adjust to 7.5%.For example, weigh 0.343kg calcium hydroxide and 0.007kg sodium-ionized bentonite to be mixed into calcium hydroxide mixed
Material is closed, then mineral powder mixed material will be mixed into the weighed 9.75kg concentrate powder of manufactured calcium hydroxide mixture supplying institute.
Mineral powder mixed material makes green-ball 12 minutes in disc balling machine, make after green-ball with sieve sieve take granularity 9~
The green-ball of 16mm, carry out following roasting technique using green-ball of the roasting cup to 9~16mm of granularity that sieve takes: green-ball is first in temperature
320 DEG C progress forced air drying 3 minutes, it is then 4 minutes dry in 380 DEG C of exhausting of temperature, then in 520 DEG C of temperature pre- 6 points of preheatings
Clock then preheats 6 minutes at 850 DEG C of temperature, then roasts 9 minutes at 1250 DEG C of temperature, then divide in 1150 DEG C of soaking 3 of temperature
Clock；Pelletizing room temperature air cooling after soaking obtains Basic Pellets to 150 DEG C or less.
Index such as the following table 2 of Basic Pellets prepared by embodiment 2:
The index of Basic Pellets and existing acidic pellet ore in 2. embodiment 2 of table compares
| Chemical component | TFe | SiO2 | CaO | MgO | Al2O3 | B2 | Compression strength |
| Basic Pellets | 65.26% | 1.88% | 2.72% | 0.49% | 0.33% | 1.45% | 2763N/P |
| Existing acidic pellet ore | 65.92% | 3.1% | 0.31% | 0.48% | 0.35% | 0.14% | 2759N/P |
As can be seen from Table 2, Basic Pellets SiO prepared by embodiment 22Content 1.22 percentages lower than acidic pellet ore
Point, the content of " TFe+CaO " are 1.71 percentage points higher than existing acidic pellet ore.Basic Pellets basicity prepared by embodiment 2
Reach 1.45.
Embodiment 3:
Calcium hydroxide and sodium-ionized bentonite are mixed into calcium hydroxide mixture with mass ratio 96:4, then by concentrate powder and niter
Grey mixture is mixed into mineral powder mixed material with mass ratio 99:1, and the moisture of mineral powder mixed material is 7.0%.
Mineral powder mixed material makes green-ball 12 minutes in disc balling machine, make after green-ball with sieve sieve take granularity 9~
The green-ball of 16mm, carry out following roasting technique using green-ball of the roasting cup to 9~16mm of granularity that sieve takes: green-ball is first in temperature
300 DEG C progress forced air drying 3 minutes, it is then 5 minutes dry in 350 DEG C of exhausting of temperature, then in 500 DEG C of temperature pre- 6 points of preheatings
Clock is then preheated 6 minutes at 700 DEG C of temperature, is then roasted 10 minutes at 1240 DEG C of temperature, then in 1150 DEG C of soaking 2 of temperature
Minute, the pelletizing room temperature air cooling after soaking obtains Basic Pellets to 150 DEG C or less.
Embodiment 4:
Calcium hydroxide and sodium-ionized bentonite with mass ratio are that 98:2 is mixed into calcium hydroxide mixture, then by concentrate powder and system
At calcium hydroxide mixture with mass ratio be that 95:5 is mixed into mineral powder mixed material, then with being mixed with water to mix miberal powder
The moisture for closing material is adjusted to 7.2%.
Mineral powder mixed material makes green-ball 12 minutes in disc balling machine, make after green-ball with sieve sieve take granularity 9~
The green-ball of 16mm, carry out following roasting technique using green-ball of the roasting cup to 9~16mm of granularity that sieve takes: green-ball is first in temperature
350 DEG C progress forced air drying 3 minutes, it is then 3 minutes dry in 450 DEG C of exhausting of temperature, then in 650 DEG C of temperature pre- 5 points of preheatings
Clock is then preheated 5 minutes at 1000 DEG C of temperature, is then roasted 8 minutes at 1260 DEG C of temperature, then in 1150 DEG C of soaking 3 of temperature
Minute；Pelletizing room temperature air cooling after soaking obtains Basic Pellets to 150 DEG C or less.
Embodiment 5:
Calcium hydroxide and sodium-ionized bentonite are mixed into calcium hydroxide mixture with mass ratio 97:3, then by concentrate powder be made
Calcium hydroxide mixture with quality be that 96:2 is mixed into mineral powder mixed material, then with addition of water with by the moisture tune of mineral powder mixed material
It is whole to 7.1%.Mineral powder mixed material makes green-ball 12 minutes in disc balling machine, make after green-ball with sieve sieve take granularity 9~
The green-ball of 16mm, carry out roasting technique to the green-ball for 9~16mm of granularity that sieve takes: roasting technique refers to aforementioned in embodiment 5
One embodiment, this embodiment is not repeated.
Embodiment 6:
Calcium hydroxide and sodium-ionized bentonite with mass ratio are that 97:3 is mixed into calcium hydroxide mixture, then by concentrate powder and system
At calcium hydroxide mixture with mass ratio be that 97:3 is mixed into mineral powder mixed material, then with addition of water with by the water of mineral powder mixed material
Divide and adjusts to 7.2%.After mineral powder mixed material makes green-ball 11.9 minutes in disc balling machine with sieve sieve take granularity 9~
The green-ball of 16mm carries out roasting technique: the roasting work in embodiment 6 using green-ball of the roasting cup to 9~16mm of granularity that sieve takes
Skill refers to aforementioned any embodiment, and this embodiment is not repeated.
Embodiment 7:
Calcium hydroxide and sodium-ionized bentonite are mixed into calcium hydroxide mixture with mass ratio 97:3, then by concentrate powder be made
Calcium hydroxide mixture mineral powder mixed material is mixed into mass ratio 98:2, then with addition of water with by the moisture tune of mineral powder mixed material
It is whole to 7.4%.Mineral powder mixed material makes green-ball 12.1 minutes in disc balling machine, is sieved after making green-ball with sieve and takes granularity 9
The green-ball of~16mm carries out roasting technique using green-ball of the roasting cup to 9~16mm of granularity that sieve takes: roasting work in embodiment 7
Skill refers to aforementioned any embodiment, and this embodiment is not repeated.
Based on the same inventive concept, the mining mineral powder mixed material of Alkalinous pelletizing is prepared the embodiment of the invention also provides a kind of,
Preparation process can refer to step S1~S2 of aforementioned base pellet preparation method embodiment, in order to illustrate the succinct of book, originally
Text repeats no more.
The one or more embodiments provided by the embodiments of the present invention, at least realize following technical effect or excellent
Point:
Calcium hydroxide and sodium-ionized bentonite are mixed into calcium hydroxide mixture due to first passing through, calcium hydroxide is mixed in calcium hydroxide
Close material in mass percent be 96%~98%, mass percent of the sodium-ionized bentonite in calcium hydroxide mixture be 2%~
4%, wherein 96%~98% calcium hydroxide is high with addition of the proportion of sodium-ionized bentonite in pellet is greatly reduced, to reduce
SiO2And Al2O3Content, while calcium hydroxide will be decomposed in the pre- warm-up phase of roasting technique, therefore to pellet roasting intensity
Influence it is small, then will calcium hydroxide mixture be incorporated concentrate powder in be mixed into mineral powder mixed material, concentrate powder is in mineral powder mixed material
Mass percent is 95%~99%, therefore is alkaline components there are also 1%~5% calcium hydroxide mixture, to effectively improve
The basicity of pellet, is able to produce out Basic Pellets, so that it is lower to solve pellet use ratio in blast furnace process
The technical issues of, and then Basic Pellets can improve pellet in blast furnace process and enter furnace ratio, improve blast furnace process index.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of Basic Pellets preparation method, comprising:
Calcium hydroxide and sodium-ionized bentonite are mixed into calcium hydroxide mixture, wherein in the calcium hydroxide mixture: described
The mass percent of calcium hydroxide is 96%~98%, and the mass percent of the sodium-ionized bentonite is 2%~4%；
The calcium hydroxide mixture is incorporated in concentrate powder and is mixed into mineral powder mixed material, wherein in the mineral powder mixed material
In: the mass percent of the concentrate powder is 95%~99%, and the mass percent of the calcium hydroxide mixture is 1%~5%；
Sieve takes the green-ball of release mesh to be fired technique after the mineral powder mixed material is prepared green-ball, to obtain Basic Pellets；
It is characterized by:
The mineral powder mixed material is prepared into sieve after green-ball the green-ball of release mesh is taken to be fired technique and includes:
The mineral powder mixed material makes green-ball in disc balling machine；
Sieve takes the green-ball of 9~16mm of granularity through the roasting technique, wherein the roasting technique includes that the air blast successively carried out is done
It is dry, exhausting is dry, preheating, preheating, roasting, soaking and cooling, wherein the temperature of the preheating is 500~650 DEG C.
2. Basic Pellets preparation method as described in claim 1, which is characterized in that the Ca (OH) of the calcium hydroxide2Content >
92%, content >=90% of grain diameter≤44 μm in the calcium hydroxide.
3. Basic Pellets preparation method as described in claim 1, which is characterized in that the water absorption rate of the sodium-ionized bentonite >=
700%.
4. Basic Pellets preparation method as described in claim 1, which is characterized in that
The forced air drying carries out 3 minutes at 300~350 DEG C of temperature；
The exhausting is dry to be carried out 4~5 minutes at 350~450 DEG C of temperature；
The preheating carries out 5~6 minutes；
The preheating carries out 5~6 minutes at 700~1000 DEG C of temperature；
The roasting carries out 8~10 minutes at 1240~1260 DEG C of temperature.
5. such as claim1The Basic Pellets preparation method, which is characterized in that the soaking carries out 2~3 at 1150 DEG C
Minute.
6. a kind of prepare the mining mineral powder mixed material of Alkalinous pelletizing, which is characterized in that each component including following mass percent: disappear
Lime 0.96%~4.9%, sodium-ionized bentonite 0.02%~0.2%, concentrate powder 95%~99%.
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| CN107488784B (en) * | 2017-09-06 | 2019-07-26 | 安徽工业大学 | A kind of blast furnace ironmaking superfluxed pellets and its production method |
| CN109097561B (en) * | 2018-06-29 | 2021-03-19 | 首钢京唐钢铁联合有限责任公司 | Method for producing low-silicon-melting-agent pellets by large-scale belt type roasting machine |
| CN109161678A (en) * | 2018-09-30 | 2019-01-08 | 四川德胜集团钒钛有限公司 | A kind of ameliorative Basic Pellets and preparation method thereof |
| CN109852788B (en) * | 2019-03-20 | 2021-05-25 | 首钢集团有限公司 | Method and device for preparing alkaline pellets by using slaked lime |
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