CN107377207A - A kind of refractory iron ore closed circuit rotary kiln baking dry grinding dry separation craft online - Google Patents
A kind of refractory iron ore closed circuit rotary kiln baking dry grinding dry separation craft online Download PDFInfo
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- CN107377207A CN107377207A CN201710562823.7A CN201710562823A CN107377207A CN 107377207 A CN107377207 A CN 107377207A CN 201710562823 A CN201710562823 A CN 201710562823A CN 107377207 A CN107377207 A CN 107377207A
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Classifications
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- 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
- 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
-
- 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
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- 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
Abstract
The present invention relates to a kind of refractory iron ore closed circuit rotary kiln baking dry grinding dry separation craft online,The 15mm refractory iron ores that grade is 25 35% are classified as 1mm granulations,+1~‑5mm,+ 5 ~ 15mm scopes,Rotary kiln is respectively adopted and carries out magnetizing roast,Roasted ore is cooled to normal temperature and broken up,It is useless that dry type pre-selection throwing is carried out to roasted ore using screw dry magnetic separator,Throw useless rear roasted ore and carry out dry grinding dry separation,Granularity 0.074mm accountings 70 80%,It is selected that three sections of dry types are carried out using flat board wind magnetic joint dry-dressing machine,Two sections,Three sections of mine tailings are after the enrichment of screw dry magnetic separator,It is enriched with mine tailing and one section of cleaner tailings,Useless rear barren rock is thrown together to discharge by qualified tailings,Grade Control is below 8%,Concentrate returns to 1mm granulation rotary systems and carries out closed circuit magnetizing roast after enrichment,Final qualified concentrate containing grade is set to reach more than 60%.The present invention realizes iron resource in online closed circuit recovery mine tailing, and it is high to solve the problems, such as that feeding Tailings Dam secondary recovery hanks this again.
Description
Technical field
The invention belongs to technical field of mineral processing, and being related to a kind of refractory iron ore, closed circuit rotary kiln baking dry grinding is dry online
Select technique.
Background technology
China's iron ore resource lean ore is more, magnetic ore deposit is few, and weak-magnetic iron ore accounts for more than the 70% of gross reserves, weak magnetic
Iron ore is handled through magnetizing roast, after being changed into strongly magnetic mineral, can carry out magnetic separation, is obtained quality and is met sintered material requirement
Iron ore concentrate.+ 15mm grades iron ore directly uses shaft furnace magnetizing roast, and -15mm grade iron ores are classified as -1mm granulations ,+1
~ -5mm ,+5 ~ -15mm enter rotary kiln and carry out magnetizing roast respectively, because refractory iron ore size fractionated has different magnetizing roasts
Characteristic, roasting time, sintering temperature are different, and certain limit grade iron ore enters rotary kiln magnetizing roast, roasting unavoidably be present
The problem of quality is uneven is burnt, that is, with the presence of rawore is burnt, causes tailings grade to be up to 14 ~ 25%, metal recovery rate is only
78% or so, and using wet-milling wet separation mine tailing it is filtered dehydration be sent into tailing dam, secondary recovery using need spend it is very big into
This.
The content of the invention
The present invention is directed to the above-mentioned problems in the prior art, there is provided a kind of refractory iron ore closed circuit rotary kiln online
Roasting dry grinding dry separation craft.
The present invention adopts the following technical scheme that：A kind of refractory iron ore closed circuit rotary kiln baking dry grinding dry separation craft online,
Specifically include following steps：
- 15mm the refractory iron ores that grade is 25-35% are classified as -1mm granulations ,+1 ~ -5mm ,+5 ~ -15mm by step A.
Scope, rotary kiln is respectively adopted and carries out magnetizing roast, roasted ore is cooled to normal temperature and broken up；
Step B. carries out dry type pre-selection throwing to roasted ore using screw dry magnetic separator and given up, and throws useless Grade Control below 8%；
Step C. dry grinds to throwing the pre- concentrate selection after giving up, and is milled to -0.074mm accounting 70-80%, is combined using flat board wind magnetic
Three sections of dry types of dry-dressing machine progress are selected, wherein, one section of dry type is selected to obtain one section of concentrate and one section of mine tailing for weak magnetic is selected；To one
Two sections of dry types of section concentrate progress are selected to obtain two sections of concentrate and two sections of mine tailings, selected to two sections of concentrate progress, three sections of dry types to obtain iron essence
Ore deposit and three sections of mine tailings, two, three sections of tailings grades are controlled in 14-25%, and the mine tailing must be enriched with after the enrichment of screw dry magnetic separator
Barren rock is together by qualified tailings discharge, total Iron Grade of Tailings control after mine tailing and enrichment concentrate, enrichment mine tailing and one section of mine tailing, throwing are useless
System below 8%, with -1mm fine ores together mix by concentrate Iron grade 25-30% after enrichment, return -1mm granulation rotary kiln baking system
Even granulation roasting, dry grinding dry separation, form closed cycle roasting dry grinding dry separation craft.
Preferably, -1mm granulation roasting times 50min, 610-620 DEG C of sintering temperature in step A；+ 1 ~ -5mm roasting times
640-650 DEG C of 60min, sintering temperature；+ 5 ~ -15mm roasting times 70min, 690-700 DEG C of sintering temperature.
Preferably, one section of selected Oe of field strength 3000, two sections of selected field strength 2500, three sections of selected Oe of field strength 2200.
Described refractory iron ore includes speculum iron, bloodstone, limonite, siderite and complicated symbiotic iron ore stone, category
Weak-magnetic iron ore, strongly magnetic mineral need to be changed into after magnetizing roast, high grade iron concentrate could be obtained by magnetic separation.
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, this
Demagnetization device is installed additional before invention is selected at each section, and de- magnetic is carried out to previous stages of magnetic separation processing iron ore concentrate, is next section of selected creation
Condition.
Normal temperature roasted ore is cooled to described in step B, due to containing 10% or so country rock in raw ore, using screw dry magnetic
Select machine to carry out dry type pre-selection to roasted ore and throw useless, waste product position is thrown by adjusting revolution speed of screw control, throw useless Grade Control 8% with
Under, follow-up ore grinding amount is reduced, reduces production cost.
The beneficial effects of the invention are as follows：The present invention is carried out by the way that rotary kiln is respectively adopted after refractory iron ore is classified
Magnetizing roast is changed into strongly magnetic mineral, and then roasted ore is carried out using screw dry magnetic separator to carry out again after dry type pre-selection throwing is useless
Three-stage is selected, improves final concentrate taste, make final concentrate grade reach 60% with, for three sections of dry types it is selected in
Two sections, three sections it is selected after obtained mine tailing carry out enriching and recovering；Pelletized because -15mm grade refractory iron ores are classified as -1mm ,+
1 ~ -5mm ,+5 ~ -15mm enter kiln and carry out magnetizing roast respectively, and certain size fraction ranges refractory iron ore enters kiln roasting and roasting unavoidably be present
Burn mineral amount it is uneven the problem of, cause two sections, three sections of tailings grades reach 14 ~ 25%, belong to unqualified mine tailing, there is recycling
Value.Two sections, three sections of mine tailings after screw dry magnetic separator enrichment processing, enrichment concentrate grade reaches 25-30%, and category burns life
Iron ore, the qualified iron ore concentrate of ability magnetic separation production grade more than 60% after palpus is fired, enrichment concentrate return -1mm granulations are turned round
Kiln system is calcined, dry separation of dry grinding, and forms online closed circuit roasting dry grinding dry separation craft.Realize iron in online closed circuit recovery mine tailing
Resource, avoid feeding Tailings Dam secondary recovery from hanking the problem of this is high again, improve resource utilization, saved water resource, fit
For water shortage mine refractory iron ore dry grinding dry separation factory.It is enriched with mine tailing and one section of cleaner tailings, the useless rear barren rock of throwing is together pressed and closed
Lattice mine tailing is discharged, and Grade Control is below 8%, metal recovery rate 91.07%.
Brief description of the drawings
The process chart of Fig. 1 present invention.
Embodiment
Embodiment 1
Refractory iron ore derives from wine steel Orebody in Jingtieshan ore deposit birch ditch mining area, and -15mm Orebody in Jingtieshan the difficulties of wine steel grade 35% are selected into iron
Ore carries out following handle：
Jingtieshan Iron Mine stone includes speculum iron（Bloodstone）, siderite, limonite and a small amount of magnetic iron ore.
A. -15mm grade speculum irons are classified as -1mm granulations ,+1 ~ -5mm ,+5 ~ -15mm, enter kiln respectively and magnetized
Roasting, -1mm granulation roasting times 50min, 620 DEG C of sintering temperature；650 DEG C of+1 ~ -5mm roasting times 60min, sintering temperature；+
700 DEG C of 5 ~ -15mm roasting times 70min, sintering temperature.Roasted ore is cooled to normal temperature and broken up, and iron ore, which burns, loses 10%, roasting
Ore deposit Iron grade 38.89%.
B. dry type pre-selection is carried out after being well mixed using screw dry magnetic separator to roasted ores at different levels and throws useless, throwing waste product position
7%th, useless yield 10% is thrown, useless pre-selection concentrate grade 42.43% is thrown, throws useless pre-selection concentrate yield 90%.
C. throw the pre- concentrate selection after giving up to dry grind to -0.074mm accountings 75%, three are carried out using flat board wind magnetic joint dry-dressing machine
Section dry type is selected, and three sections of selected rear concentrate are final qualified concentrate containing.
71.20%, one section of one section of selected Oe of field strength 3000, concentrate grade 50.5%, concentrate yield concentrate gross production rate
64.08%th, 28.8%, one section of tailings grade 7.8%, mine tailing yield mine tailing gross production rate 25.92%；
Two sections of selected Oe of field strength 2500, concentrate grade 54.45%, concentrate yield 88.15%, two section of concentrate gross production rate 56.49%, tail
11.85%, two section of ore deposit grade 14.35%, mine tailing yield mine tailing gross production rate 7.59%；
Three sections of selected Oe of field strength 2200, concentrate grade 60.6%, concentrate yield 90.65%, three section of concentrate gross production rate 51.21%, tail
9.35%, three section of ore deposit grade 25.80%, mine tailing yield mine tailing gross production rate 5.28%, the total metal recovery rate 89.94% of iron ore concentrate.
Two sections, three sections of mine tailings merge screw dry magnetic separator dry separation enrichment, two sections, three sections of mine tailings merge after tailings grade
19.67%th, yield 12.87%, enrichment concentrate grade 28.21%, yield 54.61%, gross production rate 7.03%, are enriched with tailings grade
9.60%th, yield 47.11%, the % of gross production rate 5.84.
Roasted ore dry type preliminary rejection, one section of dry type cleaner tailings, two sections and three sections of cleaner tailings enrichment mine tailings are merged into
Qualified tailings are discharged, total tailings grade 7.34%, gross production rate 44.67%.
Being enriched with concentrate return -1mm granulation rotary kiln baking systems, together mixed pelletization roasting, dry grinding are dry with -1mm fine ores
Choosing, form closed cycle roasting dry grinding dry separation craft.
It is final to obtain iron concentrate grade 60.6%, yield 52.60%, metal recovery rate 91.07%.
Embodiment 2
The refractory iron ore of use derives from wine steel Orebody in Jingtieshan ore deposit Hei Gou mining areas, and -15mm the Orebody in Jingtieshan of wine steel grade 34% is difficult
Iron ore carries out following handle：
Jingtieshan Iron Mine stone includes speculum iron（Bloodstone）, siderite, limonite and a small amount of magnetic iron ore.
A. -15mm grade speculum irons are classified as -1mm granulations ,+1 ~ -5mm ,+5 ~ -15mm, enter kiln respectively and magnetized
Roasting, -1mm granulation roasting times 50min, 610 DEG C of sintering temperature；640 DEG C of+1 ~ -5mm roasting times 60min, sintering temperature；+
690 DEG C of 5 ~ -15mm roasting times 70min, sintering temperature.Roasted ore is cooled to normal temperature and broken up, and iron ore, which burns, loses 10%, roasting
Ore deposit grade 37.57%.
B. it is useless that dry type pre-selection throwing is carried out to roasted ore using screw dry magnetic separator, waste product position 7.5% is thrown, throws useless yield
9.6%th, throw useless pre-selection concentrate grade 40.76%, throw useless pre-selection concentrate yield 90.4%.
C. throw the pre- concentrate selection after giving up to dry grind to -0.074mm accountings 78%, three are carried out using flat board wind magnetic joint dry-dressing machine
Section dry type is selected, and three sections of selected rear concentrate are final qualified concentrate containing.
One section of selected Oe of field strength 3000, concentrate grade 51.2%, 70.8%, one section of concentrate gross production rate 64.00% of concentrate yield,
29.2%, one section of tailings grade 7.86%, mine tailing yield mine tailing gross production rate 26.40%；
Two sections of selected Oe of field strength 2500, concentrate grade 55.21%, concentrate yield 87.86%, two section of concentrate gross production rate 56.23%, tail
12.14%, two section of ore deposit grade 14.96%, mine tailing yield mine tailing gross production rate 7.77%；
Three sections of selected Oe of field strength 2200, concentrate grade 60.25%, concentrate yield 90.31%, three section of concentrate gross production rate 50.78%, tail
9.69%, three section of ore deposit grade 26.12%, mine tailing yield mine tailing gross production rate 5.45%, the total metal recovery rate 88.69% of iron ore concentrate.
Two sections, three sections of mine tailings merge screw dry magnetic separator dry separation enrichment, two sections, three sections of mine tailings merge after tailings grade
20.74%th, yield 13.22%, enrichment concentrate grade 28.21, yield 54.61%, gross production rate 7.22%, enrichment tailings grade 9.54%,
Yield 46.89%, gross production rate 6.00%.
Roasted ore dry type preliminary rejection, one section of dry type cleaner tailings, two sections and three sections of cleaner tailings enrichment mine tailings are merged into
Qualified tailings are discharged, total tailings grade 7.49%, gross production rate 45.27%.
Being enriched with concentrate return -1mm granulation rotary kiln baking systems, together mixed pelletization roasting, dry grinding are dry with -1mm fine ores
Choosing, form closed cycle roasting dry grinding dry separation craft.
It is final to obtain iron concentrate grade 60.25%, yield 52.89%, metal recovery rate 91.05%.
Embodiment 3
The refractory iron ore of use derives from wine steel Orebody in Jingtieshan ore deposit Hei Gou mining areas and birch ditch mining area 1:1 composite ore, by wine steel
- 15mm Orebody in Jingtieshan the refractory iron ore of grade 34.5% carries out following handle：
Jingtieshan Iron Mine stone includes speculum iron（Bloodstone）, siderite, limonite and a small amount of magnetic iron ore.
A. -15mm grade speculum irons are classified as -1mm granulations ,+1 ~ -5mm ,+5 ~ -15mm, enter kiln respectively and magnetized
Roasting, -1mm granulation roasting times 50min, 615 DEG C of sintering temperature；645 DEG C of+1 ~ -5mm roasting times 60min, sintering temperature；+
695 DEG C of 5 ~ -15mm roasting times 70min, sintering temperature.Roasted ore is cooled to normal temperature and broken up, and iron ore, which burns, loses 10%, roasting
Ore deposit grade 38.33%.
B. it is useless that dry type pre-selection throwing is carried out to roasted ore using screw dry magnetic separator, waste product position 7.2% is thrown, throws useless yield
9.8%th, throw useless pre-selection concentrate grade 41.71%, throw useless pre-selection concentrate yield 90.2%.
C. throw the pre- concentrate selection after giving up to dry grind to -0.074mm accountings 78%, three are carried out using flat board wind magnetic joint dry-dressing machine
Section dry type is selected, and three sections of selected rear concentrate are final qualified concentrate containing.
70.32%, one section of one section of selected Oe of field strength 3000, concentrate grade 50.99%, concentrate yield concentrate gross production rate
63.29%th, 29.68%, one section of tailings grade 7.86%, mine tailing yield mine tailing gross production rate 26.71%；
Two sections of selected Oe of field strength 2500, concentrate grade 55.35%, concentrate yield 87.86%, two section of concentrate gross production rate 55.60%, tail
12.14%, two section of ore deposit grade 14.96%, mine tailing yield mine tailing gross production rate 7.68%；
Three sections of selected Oe of field strength 2200, concentrate grade 60.15%, concentrate yield 90.31%, three section of concentrate gross production rate 50.22%, tail
9.69%, three section of ore deposit grade 26.12%, mine tailing yield mine tailing gross production rate 5.39%, the total metal recovery rate 87.69% of iron ore concentrate.
Two sections, three sections of mine tailings merge screw dry magnetic separator dry separation enrichment, two sections, three sections of mine tailings merge after tailings grade
20.50%th, yield 13.07%, enrichment concentrate grade 28.21, yield 54.61%, gross production rate 7.14%, enrichment tailings grade 9.54%,
Yield 46.89%, gross production rate 5.93%.
Roasted ore dry type preliminary rejection, one section of dry type cleaner tailings, two sections and three sections of cleaner tailings enrichment mine tailings are merged into
Qualified tailings are discharged, total tailings grade 7.54%, gross production rate 45.78%.
Being enriched with concentrate return -1mm granulation rotary kiln baking systems, together mixed pelletization roasting, dry grinding are dry with -1mm fine ores
Choosing, form closed cycle roasting dry grinding dry separation craft.
It is final to obtain iron concentrate grade 60.25%, yield 51.89%, metal recovery rate 90.47%.
Claims (5)
- A kind of 1. refractory iron ore closed circuit rotary kiln baking dry grinding dry separation craft online, it is characterised in that：Specifically include following step Suddenly：Step A. by Iron grade be 25-35% -15mm refractory iron ores be classified as -1mm granulations ,+1 ~ -5mm ,+5 ~ - 15mm, rotary kiln is respectively adopted and carries out magnetizing roast, roasted ore is cooled to normal temperature and broken up；Step B. carries out dry type pre-selection throwing to roasted ore using screw dry magnetic separator and given up, and throws useless Grade Control below 8%；Step C. dry grinds to throwing the pre- concentrate selection after giving up, and is milled to -0.074mm accounting 70-80%, is combined using flat board wind magnetic Three sections of dry types of dry-dressing machine progress are selected, wherein, one section of dry type is selected to obtain one section of concentrate and one section of mine tailing for weak magnetic is selected；To one Two sections of dry types of section concentrate progress are selected to obtain two sections of concentrate and two sections of mine tailings, selected to two sections of concentrate progress, three sections of dry types to obtain iron essence Ore deposit and three sections of mine tailings, two, three sections of tailings grades are controlled in 14-25%, and the mine tailing must be enriched with after the enrichment of screw dry magnetic separator Barren rock is together by qualified tailings discharge, total Iron Grade of Tailings control after mine tailing and enrichment concentrate, enrichment mine tailing and one section of mine tailing, throwing are useless System below 8%, with -1mm fine ores together mix by concentrate Iron grade 25-30% after enrichment, return -1mm granulation rotary kiln baking system Even granulation, roasting, dry grinding dry separation, form closed cycle roasting dry grinding dry separation craft.
- 2. closed circuit rotary kiln baking dry grinding dry separation craft, its feature exist a kind of refractory iron ore as claimed in claim 1 online In：- 1mm granulation roasting times 50min, 610-620 DEG C of sintering temperature in step A；+ 1 ~ -5mm roasting times 60min, roasting temperature 640-650 DEG C of degree；+ 5 ~ -15mm roasting times 70min, 690-700 DEG C of sintering temperature.
- 3. closed circuit rotary kiln baking dry grinding dry separation craft, its feature exist a kind of refractory iron ore as claimed in claim 1 online In：One section of selected Oe of field strength 3000, two sections of selected field strength 2500, three sections of selected Oe of field strength 2200.
- 4. closed circuit rotary kiln baking dry grinding dry separation craft, its feature exist a kind of refractory iron ore as claimed in claim 1 online In：In each section of selected preceding installation demagnetization device in step C, de- magnetic is carried out to previous stages of magnetic separation processing iron ore concentrate.
- 5. closed circuit rotary kiln baking dry grinding dry separation craft, its feature exist a kind of refractory iron ore as claimed in claim 1 online In：Refractory iron ore category weak-magnetic iron ore described in step A, including speculum iron, bloodstone, limonite, siderite and above-mentioned The symbiotic iron ore stone of iron ore.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710562823.7A CN107377207A (en) | 2017-07-11 | 2017-07-11 | A kind of refractory iron ore closed circuit rotary kiln baking dry grinding dry separation craft online |
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| CN201710562823.7A CN107377207A (en) | 2017-07-11 | 2017-07-11 | A kind of refractory iron ore closed circuit rotary kiln baking dry grinding dry separation craft online |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107930842A (en) * | 2017-11-28 | 2018-04-20 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore rotary kiln baking dry type preliminary rejection is returned mine kiln method of roasting again |
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Application publication date: 20171124 |