CN107385200A - A kind of symbiosis refractory iron ore closed circuit magnetizing roast dry grinding dry separation craft online - Google Patents
A kind of symbiosis refractory iron ore closed circuit magnetizing roast dry grinding dry separation craft online Download PDFInfo
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- CN107385200A CN107385200A CN201710562276.2A CN201710562276A CN107385200A CN 107385200 A CN107385200 A CN 107385200A CN 201710562276 A CN201710562276 A CN 201710562276A CN 107385200 A CN107385200 A CN 107385200A
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- iron ore
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Classifications
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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
- C22B1/02—Roasting processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
-
- 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
Abstract
The invention discloses a kind of symbiosis refractory iron ore closed circuit magnetizing roast dry grinding dry separation craft online, belong to metallurgical technology field.The symbiosis refractory iron ore dry grinded to 0.3mm is first subjected to weak magnetic separation pre-selection operation, then it is selected three sections of weak magnetic dry types to be carried out to magnetic iron ore, magnetizing roast is carried out to the mixing mine tailing containing bloodstone, siderite, limonite and country rock, finally useless to roasted ore progress dry type throwing, dry grinding, three sections of weak magnetic dry types are selected, and merge with three sections of selected concentrate of weak magnetic dry type, obtain the iron ore concentrate of grade more than 62%, three sections of weak magnetic dry type cleaner tailings merge into true tailings of the grade below 9% with throwing useless mine tailing, and metal recovery rate reaches more than 80%.Present invention process can be online simultaneously to containing magnetic iron ore and bloodstone, the symbiosis refractory iron ore progress magnetic separation processing of siderite, limonite, improving resource utilization and metal recovery rate, and water shortage mine iron ore resource can be made to be effectively used.
Description
Technical field
The invention belongs to metallurgical technology field, closed circuit magnetizing roast dry grinding is dry online for specifically a kind of symbiosis refractory iron ore
Select technique.
Background technology
China's iron ore resource lean ore is more, magnetic ore deposit is few, magnetic iron ore and bloodstone, siderite, the difficult choosing of limonite symbiosis
Iron ore accounts for more than the 50% of iron ore gross reserves, the small salon's iron ore in such as Qinghai, Gansu Si Daogou iron ores.The difficult choosing of the symbiosis
Iron ore is handled according to single magnetic separation process, and metal recovery rate only reaches 50-60%, causes the wasting of resources, and high intensity magnetic separation is handled
Obtained iron concentrate grade is also only 50% or so, and metal recovery rate 70% or so, tailings grade is up to 18-20%, iron ore be present
Utilization rate is low or unserviceable problem.Moreover, category mine lacks water resource mostly so that iron ore equally can not be effectively sharp
With.
The content of the invention
The purpose of the present invention is, refractory iron ore low for single magnetic separation process processing symbiosis refractory iron ore metal recovery rate
A kind of stone ore mountain water shortage so that iron ore can not exploit the problem of utilization, there is provided symbiosis refractory iron ore closed circuit Roasting online
Dryout mill dry separation craft.
Closed circuit magnetizing roast dry grinding dry separation craft, its technical scheme specifically include the symbiosis refractory iron ore of the present invention online
Following steps：
A. symbiosis refractory iron ore is dry grinded to -0.3mm, carried out using field strength 1500-2000 Oe screw dry magnetic separator
Magnetic iron ore and bloodstone, the separation pre-selection operation of siderite, limonite, pre- concentrate selection is magnetic iron ore, and preliminary rejection is containing red iron
Ore deposit, siderite, the mixing mine tailing of limonite and country rock；
B. dry type fine grinding is carried out to magnetic iron ore, is milled to -0.074mm and accounts for 70%, machine is selected at one using flat board wind magnetic joint dry type
Three sections of progress is selected on belt, and three sections of concentrate grades reach more than 63%, are mixed in one section, two sections, three sections of cleaner tailings and step A
Close mine tailing and merge granulation, be sent into rotary kiln and carry out magnetizing roast；
C. roasted ore is cooled to normal temperature and broken up, thrown using screw dry magnetic separator dry type it is useless, throw useless tailings grade control 8% with
Under, throw useless rear concentrate and dry grind to -0.074mm accounting 75-80%, three section concentrate selected using flat board wind magnetic three sections of dry-dressing machine of joint
For final qualified concentrate containing, grade reaches more than 60%, and final concentrate, final iron concentrate grade are merged into three sections of concentrate in step B
Reach more than 62%, three sections of cleaner tailings Grade Controls merge into true tailings, tailings grade 9% below 10%, with throwing useless mine tailing
Below.
In above step B, the temperature of preferably magnetizing roast is 650-700 DEG C, roasting time 40-60min, this condition phase
Compared for conventional use of 750-850 DEG C of high-temperature roasting, have the function that to suppress ring formation of rotary kiln；There is roasting time simultaneously
The characteristics of short, rotary kiln production capacity can be effectively improved.
Because magnetic iron ore in continuous ore dressing, easily forms disk pack and wraps up in phenomenon, influence the selected index of dry type after roasting, because
This, in step B and step C, need to it is selected at each section before de- magnetic operation carried out using demagnetization device, handle previous stages of magnetic separation iron essence
Ore deposit carries out de- magnetic, selected is created conditions for next section.
Symbiosis refractory iron ore of the present invention online closed circuit magnetizing roast dry grinding dry separation craft compared to prior art, have with
Lower advantage：
1st, symbiosis refractory iron ore of the present invention, complicated component, containing magnetic iron ore, bloodstone, siderite and limonite,
Magnetic iron ore accounts for 15-20%, if taking magnetic separation operation single in the prior art, bloodstone, siderite and limonite therein this
A little weak magnetic minerals can not then recycle, and present invention process can carry out magnetic separation processing to this several mineral simultaneously online, carry
High resource utilization, metal recovery rate are improved to more than 80% by 50%.
2nd, present invention process is dry grinding dry separation, water shortage mine iron ore resource can be made to be effectively used, and can be scarce
Water area magnetic iron ore sorts offer technical support.
3rd, because symbiosis refractory iron ore contains magnetic iron ore and non-magnetic iron stone, first separated and preselected using weak magnetic separator,
Magnetic iron ore therein can be separated with weak magnetic mineral, be that the selected and non-magnetic iron ore magnetic roasting magnetic separation of next step magnetic iron ore is created
Condition.
4th, because magnetic iron ore sorts some country rock in mine tailing and raw ore pre-selection mixing mine tailing, can not be removed before roasting,
Bloodstone, siderite, limonite turn into strongly magnetic mineral after roasting, therefore, first need to carry out dry type throwing with screw dry magnetic separator
Useless processing, the useless tailings grade of throwing is controlled below 8%, three sections of dry types of progress are selected after throwing useless rear concentrate dry grinding, formed online
Closed circuit roasting dry grinding dry separation craft.
Embodiment
With reference to specific embodiment, to symbiosis refractory iron ore of the present invention, closed circuit magnetizing roast is dry grinded dry separation craft online
It is described further.
Embodiment 1
The present embodiment symbiosis refractory iron ore derives from Gansu Si Daogou iron ores, Iron grade 32%, wherein, magnetic iron ore accounts for 15%, red
Iron ore, siderite and limonite account for 85%, are handled according to the following steps：
A. above-mentioned symbiosis refractory iron ore is dry grinded to -0.3mm, magnetic is carried out using the Oe of field strength 1500 screw dry magnetic separator
The separation pre-selection operation of iron ore and bloodstone, siderite, limonite, pre- concentrate selection be magnetic iron ore, preliminary rejection for containing bloodstone,
The mixing mine tailing of siderite, limonite and country rock.Magnetic iron ore grade 35%, yield 50%, tailings grade is mixed after pre-selection after pre-selection
29%th, yield 50%；
B. dry type fine grinding is carried out to magnetic iron ore, is milled to -0.074mm and accounts for 75%, machine is selected at one using flat board wind magnetic joint dry type
Carried out on belt three sections it is selected, each section it is selected before first carry out de- magnetic operation, three sections of concentrate grades 63.5%, yield 27.55%, total yield
Rate 13.78%；One section, two sections, three sections of yields 72.45% of cleaner tailings grade 24.15%, gross production rates 36.22%.One section, two sections, three
Section cleaner tailings is 26.96% with mixing mine tailing in step A to merge grade, mixed pelletization, is sent into rotary kiln and carries out magnetizing roast,
Sintering temperature is 650 DEG C, and the time that material passes through rotary kiln is 60min；
C. roasted ore is cooled to normal temperature and broken up, and useless, the useless tailings grade 7.8% of throwing is thrown using screw dry magnetic separator dry type, and throwing is useless
Yield 15%, gross production rate 12.93%, throw useless rear roasted ore grade 30.34%, yield 85%, gross production rate 73.29%.Useless rear concentrate is thrown to do
Be milled to -0.074mm accountings 75%, it is selected to combine three sections of dry-dressing machine using flat board wind magnetic, each section it is selected before first carry out de- magnetic operation,
Three sections of selected concentrate are final qualified concentrate containing, iron concentrate grade 61%, yield 42%, gross production rate 30.78%, three sections of cleaner tailings product
Position 8.14%, yield 58%, gross production rate 42.51%.Gained concentrate merges into final concentrate, final iron essence with three sections of concentrate in step B
Ore deposit grade 61.78%, gross production rate 44.56%, total metal recovery rate 86.03%；Gained tailings grade and step C screw dry magnetic separation
Machine throws useless mine tailing and merges into true tailings, true tailings grade 8.04%, gross production rate 54.44%.
Embodiment 2
The present embodiment symbiosis refractory iron ore derives from Gansu Er Daogou iron ores, Iron grade 30%, wherein, magnetic iron ore accounts for 16%, red
Iron ore, siderite and limonite account for 84%, are handled according to the following steps：
A. above-mentioned symbiosis refractory iron ore is dry grinded to -0.3mm, magnetic is carried out using the Oe of field strength 1800 screw dry magnetic separator
The separation pre-selection operation of iron ore and bloodstone, siderite, limonite, pre- concentrate selection be magnetic iron ore, preliminary rejection for containing bloodstone,
The mixing mine tailing of siderite, limonite and country rock.Magnetic iron ore grade 33%, yield 50%, tailings grade is mixed after pre-selection after pre-selection
27%th, yield 50%；
B. dry type fine grinding is carried out to magnetic iron ore, is milled to -0.074mm and accounts for 75%, machine is selected at one using flat board wind magnetic joint dry type
Carried out on belt three sections it is selected, each section it is selected before first carry out de- magnetic operation, three sections of concentrate grades 62.10% are yield 26.20%, total
Yield 13.10%；One section, two sections, three sections of cleaner tailings grades 22.67%, yield 73.80%, gross production rate 36.90%.One section, two
Section, three sections of cleaner tailings are 25.16% with mixing mine tailing in step A to merge grade, mixed pelletization, are sent into rotary kiln and are magnetized
Roasting, sintering temperature are 680 DEG C, and the time that material passes through rotary kiln is 50min；
C. roasted ore is cooled to normal temperature and broken up, and useless, the useless tailings grade 7.72% of throwing is thrown using screw dry magnetic separator dry type, and throwing is useless
Yield 15.5%, gross production rate 13.47%, throw useless rear roasted ore grade 28.35%, yield 84.5%, gross production rate 73.43%.Throw useless rear essence
Ore deposit is dry grinded to -0.074mm accountings 78%, and it is selected to combine three sections of dry-dressing machine using flat board wind magnetic, each section it is selected before first carry out de- magnetic and make
Industry, three sections of selected concentrate are final qualified concentrate containing, iron concentrate grade 60.2%, yield 38.72%, gross production rate 28.43%, three sections of essences
Select tailings grade 8.23%, yield 61.28%, the % of gross production rate 45.00.Gained concentrate is merged into finally with three sections of concentrate in step B
Concentrate, final iron concentrate grade 60.80%, gross production rate 41.53%, total metal recovery rate 84.17%；Gained tailings grade and step
C screw dries magnetic separator throws useless mine tailing and merges into true tailings, true tailings grade 8.11%, gross production rate 58.47%.
Embodiment 3
The present embodiment symbiosis refractory iron ore derives from Gansu slubbing ditch iron ore, Iron grade 33%, wherein, magnetic iron ore accounts for 20%, red
Iron ore, siderite and limonite account for 80%, are handled according to the following steps：
A. above-mentioned symbiosis refractory iron ore is dry grinded to -0.3mm, magnetic is carried out using the Oe of field strength 2000 screw dry magnetic separator
The separation pre-selection operation of iron ore and bloodstone, siderite, limonite, pre- concentrate selection be magnetic iron ore, preliminary rejection for containing bloodstone,
The mixing mine tailing of siderite, limonite and country rock.Magnetic iron ore grade 36%, yield 50%, tailings grade is mixed after pre-selection after pre-selection
30%th, yield 50%；
B. dry type fine grinding is carried out to magnetic iron ore, is milled to -0.074mm and accounts for 75%, machine is selected at one using flat board wind magnetic joint dry type
Carried out on belt three sections it is selected, each section it is selected before first carry out de- magnetic operation, three sections of concentrate grades 63.90% are yield 29.20%, total
Yield 14.60%；One section, two sections, three sections of cleaner tailings grades 24.49%, yield 70.80%, gross production rate 35.40%.One section, two
Section, three sections of cleaner tailings are 27.71% with mixing mine tailing in step A to merge grade, mixed pelletization, are sent into rotary kiln and are magnetized
Roasting, sintering temperature are 700 DEG C, and the time that material passes through rotary kiln is 40min；
C. roasted ore is cooled to normal temperature and broken up, and useless, the useless tailings grade 7.92% of throwing is thrown using screw dry magnetic separator dry type, and throwing is useless
Yield 14.5%, gross production rate 12.38%, throw useless rear roasted ore grade 31.07%, yield 85.5%, gross production rate 73.02%.Throw useless rear essence
Ore deposit is dry grinded to -0.074mm accountings 80%, and it is selected to combine three sections of dry-dressing machine using flat board wind magnetic, each section it is selected before first carry out de- magnetic and make
Industry, three sections of selected concentrate are final qualified concentrate containing, iron concentrate grade 63.12%, yield 42.72%, gross production rate 31.19%, three sections of essences
Select tailings grade 7.17%, yield 57.28%, the % of gross production rate 41.83.Gained concentrate is merged into finally with three sections of concentrate in step B
Concentrate, final iron concentrate grade 63.37%, gross production rate 45.79%, total metal recovery rate 87.93%；Gained tailings grade and step
C screw dries magnetic separator throws useless mine tailing and merges into true tailings, true tailings grade 7.34%, gross production rate 54.21%.
Claims (3)
1. a kind of symbiosis refractory iron ore closed circuit magnetizing roast dry grinding dry separation craft online, it is characterised in that comprise the following steps：
A. symbiosis refractory iron ore is dry grinded to -0.3mm, carried out using field strength 1500-2000 Oe screw dry magnetic separator
Magnetic iron ore and bloodstone, the separation pre-selection operation of siderite, limonite, pre- concentrate selection is magnetic iron ore, and preliminary rejection is containing red iron
Ore deposit, siderite, the mixing mine tailing of limonite and country rock；
B. dry type fine grinding is carried out to magnetic iron ore, is milled to -0.074mm and accounts for 70%, machine is selected at one using flat board wind magnetic joint dry type
Three sections of progress is selected on belt, and three sections of concentrate grades reach more than 63%, are mixed in one section, two sections, three sections of cleaner tailings and step A
Close mine tailing and merge granulation, be sent into rotary kiln and carry out magnetizing roast；
C. roasted ore is cooled to normal temperature and broken up, thrown using screw dry magnetic separator dry type it is useless, throw useless tailings grade control 8% with
Under, throw useless rear concentrate and dry grind to -0.074mm accounting 75-80%, three section concentrate selected using flat board wind magnetic three sections of dry-dressing machine of joint
For final qualified concentrate containing, grade reaches more than 60%, and final concentrate, final iron concentrate grade are merged into three sections of concentrate in step B
Reach more than 62%, three sections of cleaner tailings Grade Controls merge into true tailings, tailings grade 9% below 10%, with throwing useless mine tailing
Below.
2. a kind of symbiosis refractory iron ore according to claim 1 closed circuit magnetizing roast magnetic separation recovery technique online, it is special
Sign is：In step B, sintering temperature is 650-700 DEG C, and the time that material passes through rotary kiln is 40-60min.
3. a kind of symbiosis refractory iron ore according to claim 1 closed circuit magnetizing roast magnetic separation recovery technique online, it is special
Sign is：In step B and step C, each section it is selected before carry out de- magnetic operation.
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Cited By (3)
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| CN108787164A (en) * | 2018-05-07 | 2018-11-13 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of sintering dust separation ash wind magnetic joint dry type iron-extracting process |
| CN108889439A (en) * | 2018-05-07 | 2018-11-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore roasted ore artificial magnet kind magnetization sorting process |
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| CN108787164A (en) * | 2018-05-07 | 2018-11-13 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of sintering dust separation ash wind magnetic joint dry type iron-extracting process |
| CN108889439A (en) * | 2018-05-07 | 2018-11-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore roasted ore artificial magnet kind magnetization sorting process |
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