CN107930843B - A kind of refractory iron ore suspension roasting dry type preliminary rejection is returned mine furnace method of roasting again - Google Patents
A kind of refractory iron ore suspension roasting dry type preliminary rejection is returned mine furnace method of roasting again Download PDFInfo
- Publication number
- CN107930843B CN107930843B CN201711219004.9A CN201711219004A CN107930843B CN 107930843 B CN107930843 B CN 107930843B CN 201711219004 A CN201711219004 A CN 201711219004A CN 107930843 B CN107930843 B CN 107930843B
- Authority
- CN
- China
- Prior art keywords
- iron ore
- roasting
- dry
- dry type
- ore
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/005—Pretreatment specially adapted for magnetic separation
- B03C1/015—Pretreatment specially adapted for magnetic separation by chemical treatment imparting magnetic properties to the material to be separated, e.g. roasting, reduction, oxidation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
-
- 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
- C22B1/02—Roasting processes
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Food Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to technical field of mineral processing, it returns mine furnace method of roasting again more particularly to a kind of refractory iron ore suspension roasting dry type preliminary rejection, the method steps are as follows: will be crushed to the dry grinding of 0-15mm granularity refractory iron ore or wet-milling is dried to -200 mesh and accounts for 45-50%, fluidization magnetizing roast is carried out using shower furnace, roasted ore is cooled to 70-80 DEG C, feed the pre-selection of screw dry magnetic separator dry type, pre- concentrate selection enters mill and selects system, preliminary rejection enters shower furnace magnetizing roast again of returning mine, it is likewise cooled to 70-80 DEG C, feeding screw dry magnetic separator, dry type preselects again, pre-selection, which progresses greatly, selects system into mill, tail is preselected to be discharged by qualified tailings, entering furnace magnetizing roast present invention is generally directed to the wide size fraction ranges of refractory iron ore causes roasted ore quality uneven, cause to sort tailings grade higher, in the presence of The not high problem of resource utilization, after refractory iron ore is handled by closed circuit method of roasting, metal recovery rate can be improved 15 percentage points or more.
Description
Technical field
The invention belongs to technical field of mineral processing, and in particular to a kind of refractory iron ore suspension roasting dry type preliminary rejection returns
Mine furnace method of roasting again.
Background technique
Iron ore resource lean ore more, magnetic mine in China's is few, and refractory iron ore accounts for about 70% of gross reserves or more, refractory iron ore
Stone category weak magnetic mineral, need to be handled through magnetizing roast, can be changed into strongly magnetic mineral, carry out inexpensive low intensity magnetic separation processing,
Obtain the qualified iron ore concentrate that quality meets sintered material requirement.Suspension roasting is magnetizing roast method newly developed in recent years, -20
Mesh accounts for 50% grade and enters furnace magnetizing roast, and size fraction ranges 0-0.297mm belongs to wide size fraction ranges and enters furnace magnetizing roast, since hardly possible is selected
Iron ore size fractionated has different magnetizing roast parameters, and especially calcining time differs greatly, and inevitably there is roasted ore quality
Non-uniform problem causes the subsequent tailings grade that sorts high, and metal recovery rate is low.Such as wine steel Orebody in Jingtieshan iron ore, head grade
31-34% carries out low intensity magnetic separation, iron concentrate grade 60% after suspension roasting, tailings grade reaches 13-15%, and metal recovery rate is only
72-74% results in waste of resources.
Summary of the invention
For above-mentioned problems of the prior art and deficiency, the present invention provides a kind of refractory iron ore suspension roasting dry type
Preliminary rejection is returned mine furnace method of roasting again, solves that refractory iron ore suspending magnetization roasting quality is uneven, magnetic tailing grade
Problem high, metal recovery rate is low.
To achieve the above object, the invention provides the following technical scheme:
A kind of refractory iron ore suspension roasting dry type preliminary rejection is returned mine furnace method of roasting again, which is characterized in that this method is pressed
It is carried out according to following step:
Step A: the refractory iron ore for being broken for 0-15mm granularity dry grinding or wet-milling are dried to -200 mesh and account for 45-50%
It breaks up；
Step B: the iron ore in step A is carried out to the magnetic of 550-650 DEG C of temperature, time 5-8min using suspension roaster
Change roasting, is cooled to 70-80 DEG C；
Step C: using complete close under the conditions of 2000-3000 Oe magnetic field strength after the iron ore after magnetizing roast is broken up
It seals screw dry magnetic separator and carries out dry type pre-selection, preselect essence and enter mill as qualified roasted ore and select system, and preselect tail and enter and return
Mine shower furnace carries out the magnetizing roast of 550-650 DEG C of temperature, time 3-6min again, is cooled to 70-80 DEG C, after breaing up
Dry type again is carried out using hermetically sealed screw dry magnetic separator under the conditions of 2000-3000 Oe magnetic field strength to preselect, and preselects smart conduct
Qualified roasted ore enters mill and system is selected to handle, and pre-selection tailings grade control is used as qualified tailings outlet below 8%.
Further, the refractory iron ore in step A includes speculum iron, bloodstone, limonite, siderite and complicated symbiosis
Iron ore.
Compared with prior art, the beneficial effects of the present invention are:
The present invention belongs to weak magnetic mineral according to refractory iron ore such as bloodstone, limonite, siderite and speculum iron etc., through magnetic
After changing roasting reduction, strongly magnetic mineral can be become, since size fractionated refractory iron ore has different magnetizing roast parameters,
Especially calcining time differs greatly, and causes shower furnace roasted ore quality uneven, so that tailings grade is higher, metal recovery rate
It is lower, it results in waste of resources, after the closed circuit method of roasting processing, rawore will be burnt using furnace magnetizing roast again of returning mine, In
Under the premise of guaranteeing 60% or more iron concentrate grade, so that tailings grade is reduced to 8% hereinafter, metal recovery rate is mentioned by 72-74 by 13%
Height effectively improves resource utilization to 88%.
Detailed description of the invention
Fig. 1 is process flow diagram of the invention.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
Embodiment 1
The present embodiment aoxidizes refractory iron ore and derives from Orebody in Jingtieshan mine birch ditch mining area, and Iron grade 32% belongs to bloodstone, water chestnut
Iron ore and limonite symbiosis difficulty ore dressing, country rock are iron content phyllite, jasper etc., are handled according to the following steps:
Step A: the refractory iron ore for being broken for 0-15mm granularity is dry grinded to -200 mesh accountings 45%；
Step B: the iron ore in step A is subjected to magnetizing roast, 650 DEG C of maturing temperature, roasting using suspension roaster
Time 8min, roasting, which finishes, is cooled to 70 DEG C；Scaling loss 10%, roasted ore Iron grade 35.55%.
Step C: the iron ore cooling after magnetizing roast is finished after breaing up, under the conditions of 2000-3000 Oe magnetic field strength
Dry type pre-selection, pre- concentrate selection Iron grade 40.44% are carried out using hermetically sealed screw dry magnetic separator, preliminary rejection grade 16% produces
Rate 80%, metal recovery rate 91%, the smart iron of pre-selection enters mill as qualified roasted ore and selects system, and preselects tail and enter suspension of returning mine
Furnace carries out the magnetizing roast of 550 DEG C of temperature, time 3min again, is cooled to 70 DEG C, strong in the magnetic field 2000-3000 Oe after breaing up
It carries out dry type again using hermetically sealed screw dry magnetic separator under the conditions of degree to preselect, pre- concentrate selection Iron grade 30.1%, preliminary rejection
Grade 8%, yield 36%, metal recovery rate 67.73%, pre-selection essence enter mill as qualified roasted ore and system are selected to handle, and preselect tail product
Position control is used as qualified tailings outlet below 8%.
Resulting comprehensive pre-selection concentrate grade 39.6% is handled by this method, yield 87.2%, metal recovery rate 97.1%,
Comprehensive pre-selection essence enters mill as qualified roasted ore and system is selected to handle, and after method for concentrating, finally obtains concentrate grade
60.02%, comprehensive metal recovery rate 89.44%, comprehensive tailings grade control is in 8% index below.
Embodiment 2
The present embodiment aoxidizes refractory iron ore and derives from the mining area Orebody in Jingtieshan mine Hei Gou, and Iron grade 34% belongs to bloodstone, sparring
Mine and limonite symbiosis difficulty ore dressing, country rock are iron content phyllite, jasper etc., are handled according to the following steps:
Step A: the refractory iron ore for being broken for 0-15mm granularity is dry grinded to -200 mesh accountings 48%；
Step B: the iron ore in step A is subjected to magnetizing roast, 600 DEG C of maturing temperature, roasting using suspension roaster
Time 6min, roasting, which finishes, is cooled to 75 DEG C；Scaling loss 9%, roasted ore Iron grade 37.36%.
Step C: the iron ore cooling after magnetizing roast is finished after breaing up under the conditions of 2000-3000 Oe magnetic field strength
Dry type pre-selection, pre- concentrate selection Iron grade 42.14% are carried out using hermetically sealed screw dry magnetic separator, preliminary rejection grade 17% produces
Rate 81%, metal recovery rate 91.35%, the smart iron of pre-selection enters mill as qualified roasted ore and selects system, and it is outstanding into returning mine to preselect tail
Floating furnace carries out the magnetizing roast of 600 DEG C of temperature, time 4min again, is cooled to 75 DEG C, in 2500 Oe magnetic field strength items after breaing up
It carries out dry type again using hermetically sealed screw dry magnetic separator under part to preselect, pre- concentrate selection Iron grade 32.64%, preliminary rejection product
Position 7.96%, yield 36.9%, metal recovery rate 70.85%, pre-selection essence enter mill as qualified roasted ore and system are selected to handle, preselect
Tailings grade control is used as qualified tailings outlet below 8%.
Resulting comprehensive pre-selection concentrate grade 41.38%, yield 88.01%, metal recovery rate are handled by this method
97.48%, comprehensive pre-selection essence enters mill as qualified roasted ore and system is selected to handle, final to obtain concentrate product after method for concentrating
Position 60.33%, comprehensive metal recovery rate 89.89%, comprehensive tailings grade control is in 8% index below.
Embodiment 3
The present embodiment aoxidizes refractory iron ore and derives from V ore body of Orebody in Jingtieshan mine birch ditch mining area, and Iron grade 25% belongs to red iron
Mine, siderite and limonite symbiosis difficulty ore dressing, country rock are iron content phyllite, jasper etc., are handled according to the following steps:
Step A: the refractory iron ore wet-milling for being broken for 0-15mm granularity is dried to -200 mesh accountings 50%；
Step B: the iron ore in step A is subjected to magnetizing roast, 650 DEG C of maturing temperature, roasting using suspension roaster
Time 8min, roasting, which finishes, is cooled to 80 DEG C；Scaling loss 10%, roasted ore Iron grade 27.77%.
Step C: the iron ore cooling after magnetizing roast is finished and is used full under the conditions of 3000 Oe magnetic field strength after breaing up
The progress dry type pre-selection of sealing screw dry-type magnetic extractor, pre- concentrate selection Iron grade 31.65%, preliminary rejection grade 14%, yield 78%,
Metal recovery rate 88.91% preselects smart iron and enters mill as qualified roasted ore and selects system, and preselects tail and enter and return mine shower furnace again
The secondary magnetizing roast for carrying out 650 DEG C of temperature, time 6min, is cooled to 80 DEG C, adopts under the conditions of 3000 Oe magnetic field strength after breaing up
Dry type pre-selection again, pre- concentrate selection Iron grade 27.36%, preliminary rejection grade are carried out with hermetically sealed screw dry magnetic separator
7.68%, yield 32.12%, metal recovery rate 62.77% preselects essence and enters mill as qualified roasted ore and system is selected to handle, preselects tail
Grade Control is used as qualified tailings outlet below 8%.
Resulting comprehensive pre-selection concentrate grade 31.29%, yield 85.07%, metal recovery rate are handled by this method
95.85%, comprehensive pre-selection essence enters mill as qualified roasted ore and system is selected to handle, final to obtain concentrate product after method for concentrating
Position 59.12%, comprehensive metal recovery rate 88.33%, comprehensive tailings grade control is in 8% index below.
Claims (2)
- The furnace method of roasting again 1. a kind of refractory iron ore suspension roasting dry type preliminary rejection is returned mine, which is characterized in that this method according to Following step carries out:Step A: the refractory iron ore for being broken for 0-15mm granularity dry grinding or wet-milling are dried to -200 mesh and account for 45-50% and broken up；Step B: will in step A dry grinding or wet-milling be dried to -200 mesh account for iron ore that 45-50% breaks up using suspension roaster into The magnetizing roast of 550-650 DEG C of trip temperature, time 5-8min, is cooled to 70-80 DEG C；Step C: hermetically sealed spiral shell is used after the iron ore after magnetizing roast is broken up under the conditions of 2000-3000 Oe magnetic field strength Dry-type magnetic extractor progress dry type pre-selection is revolved, pre-selection essence enters mill as qualified roasted ore and selects system, and it is outstanding into returning mine to preselect tail Floating furnace carries out the magnetizing roast of 550-650 DEG C of temperature, time 3-6min again, is cooled to 70-80 DEG C, in 2000 Oe after breaing up Dry type again is carried out using hermetically sealed screw dry magnetic separator under the conditions of magnetic field strength to preselect, preselect essence as qualified roasted ore into Entering mill selects system to handle, and pre-selection tailings grade control is used as qualified tailings outlet below 8%.
- The furnace method of roasting again 2. a kind of refractory iron ore suspension roasting dry type preliminary rejection as described in claim 1 is returned mine, it is special Sign is that the refractory iron ore in the step A includes speculum iron, bloodstone, limonite, siderite and complicated symbiotic iron ore Stone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711219004.9A CN107930843B (en) | 2017-11-28 | 2017-11-28 | A kind of refractory iron ore suspension roasting dry type preliminary rejection is returned mine furnace method of roasting again |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711219004.9A CN107930843B (en) | 2017-11-28 | 2017-11-28 | A kind of refractory iron ore suspension roasting dry type preliminary rejection is returned mine furnace method of roasting again |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107930843A CN107930843A (en) | 2018-04-20 |
| CN107930843B true CN107930843B (en) | 2019-11-08 |
Family
ID=61950382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711219004.9A Active CN107930843B (en) | 2017-11-28 | 2017-11-28 | A kind of refractory iron ore suspension roasting dry type preliminary rejection is returned mine furnace method of roasting again |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107930843B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110564951B (en) * | 2018-06-05 | 2020-12-11 | 中国科学院过程工程研究所 | Iron ore fluidization magnetizing roasting method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1429919A (en) * | 2002-10-18 | 2003-07-16 | 中国科学院过程工程研究所 | Method of producing titanium enriched material using titanium mineral |
| WO2004086881A1 (en) * | 2003-03-31 | 2004-10-14 | Council Of Scientific And Industrial Research | A process for preparation of hypoglycemic foods and formulations thereof |
| CN104028367A (en) * | 2013-03-05 | 2014-09-10 | 中国科学院广州地球化学研究所 | Process for recycling sulfur and iron resources in copper and sulfur tailings |
| CN104607308A (en) * | 2015-01-29 | 2015-05-13 | 鞍钢集团矿业公司 | Beneficiation method for high carbonate iron ore |
| CN104745806A (en) * | 2015-04-03 | 2015-07-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Refractory low-grade iron ore shaft furnace semi-coke added magnetizing roast process |
| CN106000638A (en) * | 2016-05-20 | 2016-10-12 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for extracting iron from comprehensive tailings of refractory iron ores |
| CN107309081A (en) * | 2017-07-11 | 2017-11-03 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of processing barren rocks iron selection technique |
| CN107362902A (en) * | 2017-07-11 | 2017-11-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of symbiosis refractory iron ore closed circuit magnetizing roast magnetic separation recovery technique online |
| CN107377205A (en) * | 2017-07-11 | 2017-11-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of iron ore suspension roasting magnetic separation flotation tailing it is circulating it is non-topple over utilize technique |
-
2017
- 2017-11-28 CN CN201711219004.9A patent/CN107930843B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1429919A (en) * | 2002-10-18 | 2003-07-16 | 中国科学院过程工程研究所 | Method of producing titanium enriched material using titanium mineral |
| WO2004086881A1 (en) * | 2003-03-31 | 2004-10-14 | Council Of Scientific And Industrial Research | A process for preparation of hypoglycemic foods and formulations thereof |
| CN104028367A (en) * | 2013-03-05 | 2014-09-10 | 中国科学院广州地球化学研究所 | Process for recycling sulfur and iron resources in copper and sulfur tailings |
| CN104607308A (en) * | 2015-01-29 | 2015-05-13 | 鞍钢集团矿业公司 | Beneficiation method for high carbonate iron ore |
| CN104745806A (en) * | 2015-04-03 | 2015-07-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Refractory low-grade iron ore shaft furnace semi-coke added magnetizing roast process |
| CN106000638A (en) * | 2016-05-20 | 2016-10-12 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for extracting iron from comprehensive tailings of refractory iron ores |
| CN107309081A (en) * | 2017-07-11 | 2017-11-03 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of processing barren rocks iron selection technique |
| CN107362902A (en) * | 2017-07-11 | 2017-11-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of symbiosis refractory iron ore closed circuit magnetizing roast magnetic separation recovery technique online |
| CN107377205A (en) * | 2017-07-11 | 2017-11-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of iron ore suspension roasting magnetic separation flotation tailing it is circulating it is non-topple over utilize technique |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107930843A (en) | 2018-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105233976B (en) | Magnetic tailing recovery process is regrinded in preenrichment roasting | |
| CN103736588B (en) | Efficient beneficiation method of comprehensively recovering low-grade vanadium titano-magnetite | |
| CN105289838B (en) | Weak magnetic is selected to be calcined magnetic tailing recovery process of regrinding | |
| CN104923386A (en) | Micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process | |
| CN107185686A (en) | A kind of ferric oxide ore combined mineral dressing technology | |
| CN107377204B (en) | Closed circuit shaft roasting is dry grinded dry separation craft online for a kind of refractory iron ore | |
| CN104785347A (en) | Separation method of high-silicon low-grade oxidized iron ore | |
| CN108080142B (en) | A kind of shaft roasting mine quality grading ore-dressing technique | |
| CN108531717A (en) | A method of Refractory red iron ores are handled based on graded combination magnetizing roast | |
| CN107597430A (en) | A kind of magnetic reconnection for handling iron tailings closes ore-dressing technique | |
| CN104785367B (en) | Mineral separation method for pre-extraction of concentrates from roasted iron ore | |
| CN105233977B (en) | Magnetic separation recovery mine tailing technique is regrinded in magnetic separation circulation roasting | |
| CN105233974A (en) | Fine grinding magnetic separation-roasting-regrinding magnetic separation tailing recovery process | |
| CN105689126B (en) | A kind of oolitic hematite ore-dressing technique | |
| CN107930843B (en) | A kind of refractory iron ore suspension roasting dry type preliminary rejection is returned mine furnace method of roasting again | |
| CN102921547A (en) | Dry type ore dressing process for iron ore | |
| CN107362904A (en) | A kind of Combination of magnetic separation flotation ore-dressing technique for handling iron tailings | |
| CN107824331A (en) | A kind of magnetic of low-grade ilmenite stone-floating beneficiation combined method method | |
| CN107377206A (en) | A kind of closed circuit recycling technique of rotary kiln baking magnetic separation iron ore stone mine tailing | |
| CN109967229A (en) | A kind of method that weathering type haplotypite containing vanadium selects smelting recycling vanadium ferrotianium | |
| CN107385200B (en) | Closed circuit magnetizing roast is dry grinded dry separation craft online for a kind of symbiosis refractory iron ore | |
| CN109675708A (en) | A kind of Pre-sorting technique of vanadium titano-magnetite | |
| CN110038717A (en) | Vanadium titano-magnetite spoil reclaming technique | |
| CN107365904B (en) | A kind of iron ore shaft roasting magnetic separation flotation tailing recycling technique | |
| CN107930842A (en) | A kind of refractory iron ore rotary kiln baking dry type preliminary rejection is returned mine kiln method of roasting again |
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 |