CN101457291A - Equipment for producing oxidized pellet and method for producing oxidized pellet by using the same - Google Patents
Equipment for producing oxidized pellet and method for producing oxidized pellet by using the same Download PDFInfo
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- CN101457291A CN101457291A CNA2007101793941A CN200710179394A CN101457291A CN 101457291 A CN101457291 A CN 101457291A CN A2007101793941 A CNA2007101793941 A CN A2007101793941A CN 200710179394 A CN200710179394 A CN 200710179394A CN 101457291 A CN101457291 A CN 101457291A
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Abstract
The invention provides a device for producing oxidized pellets and a method for producing the oxidized pellets using the device. The device provides a new production plant used in a medium speed pulverizing-drying grate-rotary kiln for producing the oxidized pellets based on a traditional drying grate-rotary kiln. The method is added with a step of grinding a mixture of mineral powder and bentonite in a hot air condition based on a traditional process, dust slurry is sprayed during pelletizing to produce wet pellets, then the wet pellets is delivered to a drying grate-rotary kiln device for roasting, and then cooled. In the device and the method, over 80% of mineral powder is minums 200 meshes (0.074mm) fine powder after medium-speed pulverizing; a little converter dust slurry is sprayed during palletizing in a disc pelletizer so as to causes the addition amount of bentonite to be only 1.0-1.5% which is only the 1/2-1/4 of the common amount of domestic enterprises, thus effectively improving the iron grade of the pellets with the compressive strength of the final pellets larger than 2200N/P.
Description
Technical field
The present invention relates to the ferrous metallurgy field, relate in particular to a kind of blast furnace ironmaking of producing with the equipment of acid pellet and utilize the method for described device fabrication acid pellet.
Background technology
Pellet is a kind of important material of Iron and Steel Production, not only have advantages such as of high grade, intensity, Well-recovered, epigranular, and acidic pellet ore and the collocation of high basicity roasted ore, can constitute the rational burden structure of blast furnace, make blast furnace ironmaking reach the purpose that the volume increase joint is burnt, increase economic efficiency.
The pellet production method has 3 kinds both at home and abroad at present: (1) shaft roasting method; (2) belt roasting method; (2) grate kiln roasting method.China's pellet production is started late, and the grate kiln roasting method is since the eighties in last century.
Chain grate machine-rotary kiln technology has begun to promote at present, nearly about 40 of 40～5,000,000 tons of chain grate machine-rotary kiln production lines having built and gone into operation, Fig. 1 is traditional ball making process schema, as shown in Figure 1, with powdered iron ore and wilkinite prepare mix after, enter pelletizer and make wet bulb, then through entering drying grate drying, preheating behind screening, the cloth, afterwards, enter rotary kiln baking, then, send into the central cooler cooling, send into pellet.In addition, many in the prior art is raw material with the magnet fine mineral powder, because the resource of China's magnetite concentrate powder lacks day by day, domesticly begin explore to use based on magnetite concentrate powder (60～70%), suitably make ball with addition of red fine iron ore, produce the practice of pellet, to reach the purpose that is not subjected to resource limit.
China is using mixing ore deposit (magnetite concentrate powder and red fine iron ore) though on the Technology of production acid pellet certain progress has been arranged at present, but because the granularity and the pelletizer reason of breeze lacked deep research, therefore, how make the ball performance with what increase that bentonitic ratio improves breeze.Investigation shows that present domestic most enterprises bentonitic addition in the pelletizing pellet forming process is 2.5～4.0%, and minority enterprise is up to 5～6%.Yet, bentonitic addition directly influences the ferrous grade of pellet, therefore, how can be under the situation that reduces bentonitic addition, the rhombohedral iron ore of use 100% or mixing ore deposit are produced and are made the good acid pellet of ball performance, and the ferrous grade and the metallurgical performance that improve pelletizing become those skilled in the art's technical problem anxious to be solved.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of and produces the equipment of acid pellet and utilize described device fabrication acid pellet method, to solve prior art when preparing acid pellet, the wilkinite addition is too high, the too much problem of pelletizing iron content taste decline.
For achieving the above object, the invention provides a kind of equipment of producing acid pellet, comprise the dosing unit-garden dish pelletizer-chain grate-rotary kiln-central cooler that connects successively, it is characterized in that, between described dosing unit and described garden dish pelletizer, also be connected with in turn and be used for powerful medium-speed pulverizer that material is pulverized and the cloth bag collection machine that the material after grinding is collected, and the hot air apparatus that send that described milling apparatus and is used for heat air delivery links to each other, so that material is ground under the hot blast condition that is used to dry with selection by winnowing.
Wherein, pulverizing the back following fine powder of 200 orders reaches more than 80%.
The auxiliary material pay-off that described garden dish pelletizer and is used for sending into to palletizing device auxiliary material is connected.Described auxiliary material pay-off is a mud flusher, and described mud flusher has the nozzle that a slurry agitator/pond and that is used for stirred slurry is used to spray mud.
The described hot air apparatus that send is the device that can carry 200～250 ℃ of hot blasts.The described hot air apparatus that send has a power conveying device, is used for sending hot air apparatus to apply the power of heat air delivery.
The described hot-blast conveying appliance that send is the hot waste gas stove.
Also be connected with screening plant and distribution device in turn between described garden dish pelletizer and the described drying grate.
And for achieving the above object, the present invention also provides a kind of method of utilizing aforesaid device to produce acid pellet, may further comprise the steps:
Step 1: breeze is mixed in a dosing unit with wilkinite;
Step 2: above-mentioned compound is sent in the powerful medium-speed pulverizer, and by one link to each other with described powerful medium-speed pulverizer send the hot air apparatus heat air delivery, hot blast is used for oven dry, selection by winnowing, the grinding of milling apparatus fine ore, and ground compound is simultaneously by in the cloth bag collector that hot blast is delivered to described powerful medium-speed pulverizer links to each other;
Step 3: the compound in the described cloth bag collector is sent in the dish pelletizer of described garden, manufactured wet bulb;
Step 4: above-mentioned wet bulb is sent into a chain grate-rotary kiln device roasting;
Step 5: the pelletizing after the roasting is made acid pellet after central cooler cooling.
In described palletizing device, send into converter dust mud making in the ball process of described step 3 by a mud flusher that is connected with described garden dish pelletizer, to improve the agglomerating performance of fine ore.
Described flue dust mud is sent into by the nozzles spray that described mud flusher is had.
The concentration of described converter dust mud is 10～12%, is preferably 8～10%.
Described breeze is 100% rhombohedral iron ore, and described bentonitic addition is 1.0～1.2%.
Described breeze be magnetite with rhombohedral iron ore mix ore deposit or 100% magnetite.
Between described step 3 and step 4, also comprise step with made wet bulb screening and cloth.
Prepared oxide pellet ultimate compression strength reaches more than the 2200N/P.
The break temperature of made wet bulb reaches more than 600 ℃.
Maturing temperature in the described step 4 in described rotary kiln is 1250～1280 ℃, and roasting time is more than 35 minutes.
Described hot-blast conveying appliance is the hot waste gas stove.
The hot blast of stating in the step 2 is 200～250 ℃, pulverizes the back following fine powder of 200 orders and reaches more than 80%.
Effect of the present invention: the present invention has changed the production technology of producing the rotary kiln acid pellet with grate kiln, provide a kind of middling speed grinding-grate kiln to produce the new Technology of acid pellet, breeze is behind medium-speed pulverizer, the fine powder of-200 orders (0.074mm) reaches more than 80%, adopt the converter stove flue dust mud that sprays 8-10% when in the dish pelletizer of garden, making ball, thereby making bentonitic addition only is 1.0～1.2%, it only is 1/2～1/4 of domestic enterprise's usual amounts, effectively improved the ferrous grade of pellet, the break temperature of made wet bulb reaches more than 600 ℃, and the ultimate compression strength of final pellet is greater than 2200N/P (YB/T005-91 primary standard 〉=2000N/P).
Description of drawings
Fig. 1 is traditional ball making process schema;
Fig. 2 produces the structure iron of the equipment of acid pellet for the present invention;
Fig. 3 is the process flow sheet that the present invention produces acid pellet.
Embodiment
Fig. 2 produces the structure iron of the equipment of acid pellet for the present invention, as shown in Figure 2, the present invention has changed the production unit that traditional grate kiln is produced the rotary kiln acid pellet, for the Iron and Steel Production acid pellet uses ground hematite, the new production unit that provides a kind of middling speed grinding-chain grate-rotary kiln to produce acid pellet is produced at traditional grate kiln to have increased between the batching of production equipment of rotary kiln acid pellet and the palletizing device and is used for material is pulverized, oven dry, material collection device (cloth bag collection machine) after milling apparatus of selection by winnowing (powerful middling speed grinding) and the grinding.Breeze after cloth bag collection machine is collected enters garden dish pelletizer by feeding device, and sprays converter dust mud by the mud flusher in the dish pelletizer of garden and make ball.The equipment that is production acid pellet of the present invention comprises: dosing unit-powerful fast grinding-cloth bag collection machine-garden dish pelletizer-roller bar grizzl(e)y-distribution device-chain grate-rotary kiln-central cooler, and the hot air apparatus that send that described milling apparatus and is used for heat air delivery links to each other, and described garden dish pelletizer links to each other with a mud flusher.
Powerful medium-speed pulverizer is connected with hot waste gas stove (200～250 ℃ hot waste gass), hot waste gas is by placing the vacuum fan behind the cloth bag collection machine to suck powerful medium-speed pulverizer, so that material is dried in process of lapping and selection by winnowing, hot waste gas stream will grind the back breeze simultaneously and be delivered to cloth bag collection machine.
After breeze enters garden dish pelletizer, in making the ball process, place the mud flusher slurry agitator (pond) converter dust mud by pressure pump (pressure is 0.2～0.3MPa) to carry, by nozzle uniformly the material in the dish pelletizer of garden spray, to strengthen the balling-up of breeze.Wherein, the concentration of described converter dust mud is 10～12%, is preferably 8～10%.
Fig. 3 is the process flow sheet that the present invention produces acid pellet, and as shown in Figure 3, the present invention adopts new production method to produce acid pellet by the equipment of above-mentioned production acid pellet, and the method for production acid pellet of the present invention may further comprise the steps:
Step 1: breeze is mixed in described dosing unit with wilkinite;
Step 2: above-mentioned compound is sent in the described powerful medium-speed pulverizer, and by sending hot air apparatus to carry to be used to the hot blast of drying with selection by winnowing so that fine ore is ground under the hot blast condition, ground compound is sent in the described cloth bag collection machine that links to each other with described powerful medium-speed pulverizer;
Step 3: the compound in the described cloth bag collection machine sent in the dish pelletizer of described garden and spray 10～12% (being preferably 8-10%) converter dust mud manufacture wet bulb;
Step 4: above-mentioned wet bulb is sent into the roasting of described chain grate-rotary kiln device;
Step 5: make acid pellet after the pelletizing after the roasting cooled off in described central cooler.
In the dish pelletizer of garden, send into converter dust mud (8～10%) by the mud flusher that is connected with described garden dish pelletizer making in the ball process of described step 3, to improve the agglomerating performance of fine ore.
Particularly, as shown in Figure 3, the present invention has changed the production technology that traditional grate kiln is produced acid pellet, for the Iron and Steel Production acid pellet uses ground hematite, provide a kind of middling speed grinding-grate kiln to produce the new Technology of acid pellet, on the traditional technology basis, increased grinding, the technology that breeze is concentrated, and in making the technological process of ball, spray flue dust mud, be earlier each component quantitatively to be cooperated among the present invention, then compound is transported to and pulverizes in the powerful medium-speed pulverizer and be aided with hot blast, make powder be convenient to obtain dry fully and pulverizing, wherein powerful medium-speed pulverizer speed is 30-300 rev/mins.This vertical strengthened medium-speed pulverizer roll crusher than normal employing abroad under hot blast helps has higher abrasive dust efficient.Made fine ore concentrates the back evenly in the conveying garden dish pelletizer in cloth bag collection machine, and constantly sprays into converter dust mud by the nozzle of the mud flusher that links to each other with garden dish pelletizer.The ball of producing like this still has enough wet tenacitys and fall strength of briquette under the situation of bentonite content≤1.2%.Wet bulb enters chain grate machine-rotary kiln production line behind screening of roller bar grizzl(e)y and cloth, roasting balling-up under selected processing parameter enters pellet.
Specify embodiments of the invention below in conjunction with Fig. 3 and experiment parameter data of the present invention.
The present invention uses 100% ground hematite as pellet feed, and ground hematite and wilkinite with 100% mix, wherein, when the water content of ground hematite less than 8～10% the time, it can be without prebake.Following table 1 and table 2 are listed the rhombohedral iron ore chemistry composition and the size composition of the Kasia of India Orissa area EMIL company respectively.
The chemical ingredients (%) of the red fine iron ore of table 1 India
| Project | TFe | FeO | CaO | MgO | Al 2O 3 | SiO 2 | S | P | Scaling loss |
| India's breeze | 66.2 | 0.46 | 0.15 | 0.02 | 1.53 | 2.64 | 0.010 | 0.004 | 0.74 |
The mechanical grading size composition (mm%) of the red fine iron ore of table 2 India
| Project | >10 | 8～10 | 5～8 | 3～5 | 2～3 | 1～2 | 0.5～ 1 | 0.1～ 0.5 | <0.1 |
| India's breeze | 3.09 | 3.95 | 17.23 | 5.72 | 8.86 | 13.02 | 10.33 | 12.31 | 25.49 |
Breeze after the above-mentioned batching sent in the powerful mill of vertical middling speed together pulverize, powerful medium-speed pulverizer is dried and selection by winnowing fine ore by a hot blast that send 200～250 ℃ of hot air apparatus inputs that driven by power set.Breeze after the pulverizing is by concentrating its granularity of breeze accounting for more than 80% below 200 orders of concentrating in the cloth bag collection machine in the cloth bag collection machine.Table 3 has been listed the typical size behind the mill and has been distributed.
The red fine iron ore mechanical grading of India size composition contrast (%) after table 3 fine grinding
| Project | >0.5 | 0.5～ 0.25 | 0.25～ 0.125 | 0.125～ 0.1 | 0.1～ 0.074 | 0.074～ 0.045 | <0.045 |
| After the fine grinding | 0.00 | 0.00 | 0.03 | 0.05 | 11.30 | 56.67 | 31.95 |
| Relatively | -22.51 | -5.53 | -7.34 | -12.53 | +13.82 | +20.83 | +13.26 |
Evenly be transported to after made fine ore collected in cloth bag collection machine in the dish apparatus for making pearl ball of garden, and by constantly spraying into converter dust mud.The ball of producing like this still has enough wet tenacitys and fall strength of briquette under the situation of bentonite content≤1.2%.
Wherein, Steel Plant's converter dust mud is dedusting product in the top-blown oxygen steelmaking process, and its main component is Fe
2O
3And CaO, Fe
2O
3Content be about 90%, the content of CaO is about 10%.Because converter dust is a kind of ultrafine powder (diameter 0.3～3 μ m), has good suspension in water.The mud that converter dust generated has good cementability, has not only utilized the waste of steel mill, and helps the balling-up of fine ore.
Bentonitic content directly influences wet tenacity, dry strength and the wear resistance of pelletizing, also influence the explosion humidity of wet bulb, the table 4 and the performance of wet bulb group when listing different bentonite content, the bentonite content that the present invention proposes was at 1.0～1.2 o'clock, the wet bulb performance can reach the industrial production requirement fully, as following table 4:
Table 4 fine grinding India ground hematite is made chou really with addition of wilkinite and sprinkling converter dust mud
| Bentonite consumption % | Wet bulb moisture | Wet bulb ultimate compression strength | The wet bulb dropping strength | Dry bulb ultimate compression strength | The wet bulb burst temperature |
| 0.8 | 9.53 | 15.3 | 6.6 | >100 | 615℃ |
| 1.0 | 9.77 | 18.6 | 8.3 | >100 | 574℃ |
| 1.2 | 9.84 | 19.6 | 9.4 | >100 | 560℃ |
As seen from the above table: the burst temperature of above-mentioned made wet bulb can reach more than 600 ℃.
Afterwards, wet bulb group gives chain grate machine-rotary kiln production line at roller bar grizzl(e)y screening back cloth.Table 5 has been listed the test parameter of drying, preheating, roasting, and 1250～1280 ℃ of following roastings determining by the present invention just can make the solid-phase crystallization of pellet attain full development more than 35 minutes as can be seen, and ultimate compression strength reaches more than the 2200N/P.The pelletizing that comes out from rotary kiln is sent to pellet through the central cooler cooling.
Table 5 India red fine iron ore pellet roasting technology
The present invention uses the medium-speed pulverizer-cloth bag receipts powder device that independently has hot waste gas and has carried out industrialness grinding production test more than 1000 tons to originating from India's breeze; And, be transported on traditional pellet production line (the interim converter dust mud device that increases on the dish pelletizer of garden) with the breeze after the grinding that is obtained and produced the pellet more than 1000 tons, obtained satisfied result.Table 6 has been listed the chemical ingredients of final pellet.
Table 6 India red fine iron ore pellet chemical ingredients
| TFe | FeO | CaO | MgO | Al 2O 3 | SiO 2 | S | |
| The finished ball nodulizing | 65.56 | 0.74 | 0.25 | 0.01 | 1.84 | 3.12 | 0.0015 |
As shown in Table 6: produce acid pellet by above-mentioned process for making, when utilizing rhombohedral iron ore to produce pellet, bentonitic addition is reduced to 1/2～1/4 of domestic enterprise's usual amounts, the ultimate compression strength of pellet has reached more than the 2200N/P, and the iron-holder of pellet reduces seldom with respect to the iron-holder of raw material rhombohedral iron ore.
The present invention has not only carried out complete type approval test to the India ore deposit, and the test in different process stage has been carried out from Australia, Brazilian rhombohedral iron ore in the place of production, and the rhombohedral iron ore of test-results and India Orissa is basic identical, only needs to adjust relevant to parameter.
What certainly, the device of production acid pellet of the present invention and generation method also were applicable to rhombohedral iron ore and magnetite mixes ore deposit and 100% magnetite.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; being familiar with those of ordinary skill in the art ought can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (19)
1, a kind of equipment of producing acid pellet, comprise the dosing unit-garden dish pelletizer-chain grate-rotary kiln-central cooler that connects successively, it is characterized in that, between described dosing unit and described garden dish pelletizer, also be connected with in turn and be used for powerful medium-speed pulverizer that material is pulverized and the cloth bag collection machine that the material after grinding is collected, and the hot air apparatus that send that described milling apparatus and is used for heat air delivery links to each other, so that material is ground under the hot blast condition that is used to dry with selection by winnowing.
2, the equipment of production acid pellet according to claim 1 is characterized in that, pulverizes the back following fine powder of 200 orders and reaches more than 80%.
3, the equipment of production acid pellet according to claim 1 is characterized in that, the described hot-blast conveying appliance that send is the hot waste gas stove.
According to the equipment of claim 1 or 3 described production acid pellets, it is characterized in that 4, the described hot air apparatus that send is the device that can carry 200～250 ℃ of hot blasts.
5, the equipment of production acid pellet according to claim 1 is characterized in that, the auxiliary material pay-off that described garden dish pelletizer and is used for sending into to palletizing device auxiliary material is connected.
6, the equipment of production acid pellet according to claim 5 is characterized in that, described auxiliary material pay-off is a mud flusher, and described mud flusher has the nozzle that a slurry agitator/pond and that is used for stirred slurry is used to spray mud.
7, a kind of method of producing acid pellet may further comprise the steps:
Step 1: breeze is mixed in a dosing unit with wilkinite;
Step 2: above-mentioned compound is sent in the powerful medium-speed pulverizer, and by one link to each other with described powerful medium-speed pulverizer send the hot air apparatus heat air delivery, hot blast is used for oven dry, selection by winnowing, the grinding of milling apparatus fine ore, and ground compound is simultaneously by in the cloth bag collector that hot blast is delivered to described powerful medium-speed pulverizer links to each other;
Step 3: the compound in the described cloth bag collector is sent in the dish pelletizer of described garden, manufactured wet bulb;
Step 4: above-mentioned wet bulb is sent into a chain grate-rotary kiln device roasting;
Step 5: the pelletizing after the roasting is made acid pellet after central cooler cooling.
8, method according to claim 7 is characterized in that, the hot blast in the described step 2 is 200～250 ℃, pulverizes the back following fine powder of 200 orders and reaches more than 80%.
9, according to claim 7 or 8 described methods, it is characterized in that, in described palletizing device, send into converter dust mud making in the ball process of described step 3 by a mud flusher that is connected with described garden dish pelletizer, to improve the agglomerating performance of fine ore.
10, method according to claim 9 is characterized in that, the concentration of converter dust mud is 10～12%.
11, method according to claim 10 is characterized in that, the concentration of converter dust mud is preferably 8～10%.
12, method according to claim 9 is characterized in that, described flue dust mud is sent into by the nozzles spray that described mud flusher is had.
According to claim 7 or 8 described methods, it is characterized in that 13, described breeze is 100% rhombohedral iron ore, described bentonitic addition is 1.0～1.2%.
14, according to claim 7 or 8 described methods, it is characterized in that, described breeze be magnetite with rhombohedral iron ore mix ore deposit or 100% magnetite.
15, according to claim 7 or 8 described methods, it is characterized in that, between described step 3 and step 4, also comprise step made wet bulb screening and cloth.
According to claim 7 or 8 described methods, it is characterized in that 16, prepared oxide pellet ultimate compression strength reaches more than the 2200N/P.
17, according to claim 7 or 8 described methods, it is characterized in that the break temperature of made wet bulb reaches more than 600 ℃.
According to claim 7 or 8 described methods, it is characterized in that 18, the maturing temperature in the described step 4 in described rotary kiln is 1250～1280 ℃, roasting time is more than 35 minutes.
19, method according to claim 7 is characterized in that, described hot-blast conveying appliance is the hot waste gas stove.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101793941A CN101457291A (en) | 2007-12-12 | 2007-12-12 | Equipment for producing oxidized pellet and method for producing oxidized pellet by using the same |
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|---|---|---|---|
| CNA2007101793941A CN101457291A (en) | 2007-12-12 | 2007-12-12 | Equipment for producing oxidized pellet and method for producing oxidized pellet by using the same |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2010078638A1 (en) * | 2009-01-09 | 2010-07-15 | Minesteel Representação E Comércio Ltda | Process for implementing and improving pellet feed by using fines from steel works |
| CN102031364A (en) * | 2010-12-17 | 2011-04-27 | 山西太钢不锈钢股份有限公司 | Method for enhancing intensity of ground hematite pellet preheated pellets |
| CN102126243A (en) * | 2010-11-30 | 2011-07-20 | 南京梅山冶金发展有限公司 | Water pre-adding balling method and device in production of permanent magnetic ferrite pre-sintered material |
| CN102230073A (en) * | 2011-06-14 | 2011-11-02 | 李国三 | Method for producing magnetic iron ore by using limonite |
| CN102828022A (en) * | 2012-09-11 | 2012-12-19 | 新兴能源装备股份有限公司 | Production process of pure hematite alkaline pellets |
| CN103582529A (en) * | 2011-06-15 | 2014-02-12 | 奥图泰有限公司 | Equipment to prepare ore concentrate for pelletizing |
| CN104060087A (en) * | 2014-06-18 | 2014-09-24 | 中信重工机械股份有限公司 | Iron ore concentrate oxidized pellet production process |
| CN104164556A (en) * | 2014-07-31 | 2014-11-26 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Chain grate-tandem rotary kiln whole-particle fraction magnetic roasting process for refractory low-grade iron ore |
| CN104458795A (en) * | 2014-12-01 | 2015-03-25 | 武钢集团昆明钢铁股份有限公司 | Method for rapidly and accurately measuring cracking temperature of green pellets |
| CN105506273A (en) * | 2014-09-26 | 2016-04-20 | 鞍钢股份有限公司 | Method for adding red mud into pellets |
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| WO2010078638A1 (en) * | 2009-01-09 | 2010-07-15 | Minesteel Representação E Comércio Ltda | Process for implementing and improving pellet feed by using fines from steel works |
| CN102126243A (en) * | 2010-11-30 | 2011-07-20 | 南京梅山冶金发展有限公司 | Water pre-adding balling method and device in production of permanent magnetic ferrite pre-sintered material |
| CN102031364A (en) * | 2010-12-17 | 2011-04-27 | 山西太钢不锈钢股份有限公司 | Method for enhancing intensity of ground hematite pellet preheated pellets |
| CN102031364B (en) * | 2010-12-17 | 2012-10-03 | 山西太钢不锈钢股份有限公司 | Method for enhancing intensity of ground hematite pellet preheated pellets |
| CN102230073A (en) * | 2011-06-14 | 2011-11-02 | 李国三 | Method for producing magnetic iron ore by using limonite |
| CN103582529A (en) * | 2011-06-15 | 2014-02-12 | 奥图泰有限公司 | Equipment to prepare ore concentrate for pelletizing |
| CN102828022A (en) * | 2012-09-11 | 2012-12-19 | 新兴能源装备股份有限公司 | Production process of pure hematite alkaline pellets |
| CN104060087B (en) * | 2014-06-18 | 2016-05-25 | 中信重工机械股份有限公司 | A kind of iron ore concentrate acid pellet production technology |
| CN104060087A (en) * | 2014-06-18 | 2014-09-24 | 中信重工机械股份有限公司 | Iron ore concentrate oxidized pellet production process |
| CN104164556A (en) * | 2014-07-31 | 2014-11-26 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Chain grate-tandem rotary kiln whole-particle fraction magnetic roasting process for refractory low-grade iron ore |
| CN104164556B (en) * | 2014-07-31 | 2016-06-29 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of difficulty selects iron ore of low ore grade drying grate-series connected type turning kiln wholegrain level magnetic roasting process |
| CN105506273A (en) * | 2014-09-26 | 2016-04-20 | 鞍钢股份有限公司 | Method for adding red mud into pellets |
| CN104458795A (en) * | 2014-12-01 | 2015-03-25 | 武钢集团昆明钢铁股份有限公司 | Method for rapidly and accurately measuring cracking temperature of green pellets |
| CN110402293A (en) * | 2017-03-22 | 2019-11-01 | 首钢集团有限公司 | Pellet, preparation method and preparation facilities |
| CN110402293B (en) * | 2017-03-22 | 2022-02-18 | 首钢集团有限公司 | Pellet ore, and method and apparatus for producing the same |
| CN110273040A (en) * | 2019-08-02 | 2019-09-24 | 唐山鑫虎冶金科技有限公司 | Iron powder is cold-pressed reduction apparatus and method |
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