CN107365905A - Closed circuit shower furnace is calcined dry grinding dry separation craft to a kind of refractory iron ore online - Google Patents
Closed circuit shower furnace is calcined dry grinding dry separation craft to a kind of refractory iron ore online Download PDFInfo
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- CN107365905A CN107365905A CN201710562822.2A CN201710562822A CN107365905A CN 107365905 A CN107365905 A CN 107365905A CN 201710562822 A CN201710562822 A CN 201710562822A CN 107365905 A CN107365905 A CN 107365905A
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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
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The present invention relates to a kind of refractory iron ore, closed circuit shower furnace roasting dry grinding dry separation craft, its step are as follows online：15mm refractory iron ores are milled to the miberal powder of 0.074mm accountings 45 50%, magnetizing roast is carried out using shower furnace, roasted ore is cooled to less than 57 DEG C, it is useless that dry type pre-selection throwing is carried out to roasted ore using screw dry magnetic separator, useless rear roasted ore is thrown to dry grind to 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 suspension furnace system and carries out closed circuit magnetizing roast after enrichment, three sections of selected rear concentrate are final qualified concentrate containing, grade reaches more than 60%.The present invention realizes iron resource in online closed circuit recovery mine tailing, improves iron recovery.
Description
Technical field
The invention belongs to technical field of mineral processing, and being related to a kind of refractory iron ore, closed circuit shower furnace roasting 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 milled to -0.074mm accountings
50% or so, which enters shower furnace, carries out magnetizing roast, because difficulty selects ferric oxide ore size fractionated to have different magnetizing roast characteristics, roasting
The parameters such as burning time, sintering temperature are different, and certain limit grade iron ore enters shower furnace magnetizing roast, roasting unavoidably be present
The problem of quality is uneven, that is, with the presence of rawore is burnt, cause tailings grade to be up to 15-25%, metal recovery rate is only 75-
80% or so, and tailing dam is sent into using the filtered dehydration of wet-milling wet separation mine tailing, secondary recovery is high using complex process, cost.
The content of the invention
The present invention is directed to certain size fraction ranges refractory iron ore shower furnace magnetizing roast, and roasted ore quality is uneven, causes
A kind of the problem of magnetic tailing grade is high, and recycling cost is high, there is provided refractory iron ore closed circuit shower furnace roasting dry grinding online
Dry separation craft.
The present invention adopts the following technical scheme that：Closed circuit shower furnace is calcined dry grinding dry separation craft to a kind of refractory iron ore online,
Specifically include following steps：
Step A. carries out magnetizing roast, roasting using shower furnace to being milled to -0.074mm accounting 45-50% refractory iron ores miberal powder
Ore deposit is cooled to less than 57 DEG C；
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. throws the pre- concentrate selection after giving up by dry grinding, -0.074mm accounting 70-80% is milled to, through flat board wind magnetic joint dry separation
Three sections of dry types of machine are selected, and three sections of selected rear concentrate are final qualified concentrate containing, and grade reaches more than 60%；
Dry-dressing machine is selected two sections for step D. flat board wind magnetic joint, three sections of mine tailings after the enrichment of screw dry magnetic separator, be enriched with mine tailing
Together discharged with one section of mine tailing, the useless rear barren rock of throwing by qualified tailings, Iron Grade of Tailings control is below 8%；
Concentrate return to step A shower furnace calcining magnetic separation system continues magnetizing roast after step E. enrichments, realizes online closed circuit magnetic
Change roasting, dry grinding dry 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.
Oxidation refractory iron ore described in step A includes speculum iron, bloodstone, limonite, siderite and complicated symbiosis
Iron ore, belong to weak-magnetic iron ore, need to after magnetizing roast can magnetic separation obtain high grade iron concentrate.
Roasted ore after described cooling, due to containing 8-12% or so country rock in raw ore, using screw dry magnetic separator to roasting
It is useless to burn ore deposit progress dry type pre-selection throwing, by adjusting revolution speed of screw control throwing waste product position, throws and gives up Grade Control below 8%, after reduction
Continuous ore grinding amount, reduces production cost.
Dry-dressing machine is selected two sections, three sections of tails for flat board wind magnetic joint described in step D, ferric oxide ore is selected due to difficulty be milled to-
0.074mm accountings 50% or so enter stove and carry out magnetizing roast, and certain size fraction ranges miberal powder enters stove roasting and roasted ore quality be present unavoidably
The problem of uneven, cause two sections, three sections of tailings grades reach 15-25%, belong to unqualified mine tailing, the value for having recycling.Institute
State two sections, three sections of mine tailings after screw dry magnetic separator enrichment processing, enrichment concentrate grade reaches 25-30%, and category burns pig iron ore deposit
Stone, must it is fired after could magnetic separation production grade more than 60% qualified iron ore concentrate, enrichment concentrate return shower furnace enter roasting,
Dry grinding dry separation craft system, online closed circuit roasting dry grinding dry separation craft is formed, reduces cost, raising iron recovery.
The beneficial effects of the invention are as follows：The present invention is according to the certain size fraction ranges iron ore shower furnace Roasting of refractory iron ore
It is uneven to burn quality, causes tailings grade height, metal recovery rate low, mine tailing, which has to recycle, is worth this feature, develops
Closed circuit recycling technique, metal recovery rate bring up to more than 88% by 75-85%, reduce wet-milling the unqualified mine tailing of magnetic separation online
Wet separation mine tailing is sent into the cost that tailing dam recycles again, improves resource utilization, has saved water resource, is water shortage mine
Provide a kind of effective way for handling refractory iron ore.
Brief description of the drawings
The process chart of Fig. 1 present invention.
Embodiment
Embodiment 1
The oxidation refractory iron ore of use derives from wine steel Orebody in Jingtieshan ore deposit birch ditch mining area, by -15mm the mirrors of wine steel grade 33%
Iron mountain refractory iron ore carries out following handle：Orebody in Jingtieshan refractory iron ore mainly contains bloodstone, siderite, limonite and a small amount of magnetic
Iron ore, category difficulty select weak-magnetic iron ore, and country rock is irony phyllite, jasper etc.；
Closed circuit shower furnace is calcined dry grinding dry separation craft to a kind of refractory iron ore online, specifically includes following steps：
A. -15mm Orebody in Jingtieshan refractory iron ores are milled to -0.074mm accountings 48%, magnetizing roast, roasting is carried out using shower furnace
650 DEG C of time 6min, sintering temperature, roasted ore are cooled to 55 DEG C, scaling loss 8%, roasted ore grade 35.87%, roasted ore yield
92%；
B. it is useless that dry type pre-selection throwing is carried out to roasted ore using screw dry magnetic separator, waste product position 7.31% is thrown, throws useless yield 9%, throwing
Useless pre-selection concentrate grade 38.69%, throw useless pre-selection concentrate yield 91%.
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.
70.52%, one section of one section of selected Oe of field strength 3000, concentrate grade 51.03%, concentrate yield concentrate gross production rate
64.17%th, 29.48%, one section of tailings grade 9.19%, mine tailing yield mine tailing gross production rate 26.83%；
Two sections of selected Oe of field strength 2500, concentrate grade 55.33%, concentrate yield 89.56%, two section of concentrate gross production rate 57.47%, tail
10.44%, two section of ore deposit grade 14.14%, mine tailing yield mine tailing gross production rate 6.70%；
Three sections of selected Oe of field strength 2200, concentrate grade 60.52%, concentrate yield 86.66%, three section of concentrate gross production rate 49.81%, tail
13.34%, three section of ore deposit grade 21.61%, mine tailing yield mine tailing gross production rate 7.67%, the total metal recovery rate 84.03% 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
20.89%th, yield 14.37%, enrichment concentrate grade 29.36%, yield 53.15%, gross production rate 7.64%, enrichment tailings grade
11.24%th, yield 47.01%, gross production rate 6.73%.
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 9.11%, gross production rate 45.19%.
Enrichment concentrate returns to shower furnace roasting system and is calcined, and 650 DEG C of sintering temperature, roasting time 50min, cold-zone is extremely
Normal temperature, former dry grinding dry separation system is returned to, form closed cycle roasting dry grinding dry separation craft.
Final iron concentrate grade 60.52%, yield 52.81%, the metal recovery rate of obtaining is up to 89.10%.
Embodiment 2
The oxidation refractory iron ore of use derives from wine steel Orebody in Jingtieshan ore deposit Hei Gou mining areas, by -15mm the spiegel of wine steel grade 35%
Mountain refractory iron ore carries out following handle：Orebody in Jingtieshan refractory iron ore mainly contains bloodstone, siderite, limonite and a small amount of magnet
Ore deposit, category difficulty select weak-magnetic iron ore, and country rock is irony phyllite, jasper etc..
Closed circuit shower furnace is calcined dry grinding dry separation craft to a kind of refractory iron ore online, specifically includes following steps：
A. -15mm Orebody in Jingtieshan refractory iron ores are milled to -0.074mm accountings 50%, magnetizing roast, roasting is carried out using shower furnace
650 DEG C of time 6min, sintering temperature, roasted ore are cooled to 55 DEG C, scaling loss 10%, roasted ore grade 38.89%, roasted ore yield
90%；
B. roasted ore is carried out using screw dry magnetic separator dry type pre-selection throw it is useless, throw waste product position 7.69%, throw useless yield 10%,
Throw useless pre-selection concentrate grade 42.36%, throw 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.
76.55%, one section of one section of selected Oe of field strength 3000, concentrate grade 52.56%, concentrate yield concentrate gross production rate
68.90%th, 23.45%, one section of tailings grade 9.04%, mine tailing yield mine tailing gross production rate 21.11%；
Two sections of selected Oe of field strength 2500, concentrate grade 55.35%, concentrate yield 92.88%, two section of concentrate gross production rate 63.99%, tail
7.12%, two section of ore deposit grade 16.16%, mine tailing yield mine tailing gross production rate 4.91%；
Three sections of selected Oe of field strength 2200, concentrate grade 60.46%, concentrate yield 87.33%, three section of concentrate gross production rate 55.88%, tail
12.67%, three section of ore deposit grade 20.13%, mine tailing yield mine tailing gross production rate 8.77%, the total metal recovery rate 86.88% 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
19.45%th, yield 13.01%, enrichment concentrate grade 30.01%, yield 52.66%, gross production rate 6.85%, enrichment tailings grade
7.75%th, yield 47.34%, gross production rate 6.16%.
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 8.46%, gross production rate 39.12%.
Enrichment concentrate returns to shower furnace roasting system and is calcined, and 650 DEG C of sintering temperature, roasting time 50min, cold-zone is extremely
Normal temperature, former dry grinding dry separation system is returned to, form closed cycle roasting dry grinding dry separation craft.
Final iron concentrate grade 60.46%, yield 58.88%, the metal recovery rate of obtaining is up to 91.54%.
Embodiment 3
Closed circuit shower furnace roasting dry grinding dry separation craft, the oxidation refractory iron ore of use derive from wine to a kind of refractory iron ore online
Steel Orebody in Jingtieshan ore deposit Hei Gou mining areas and birch ditch mining area iron ore 1:1 aggregate sample, -15mm the Orebody in Jingtieshan of wine steel grade 34% is difficult
Iron ore carries out following handle：Orebody in Jingtieshan refractory iron ore mainly contains bloodstone, siderite, limonite and a small amount of magnetic iron ore,
Category difficulty selects weak-magnetic iron ore, and country rock is irony phyllite, jasper etc..
Closed circuit shower furnace is calcined dry grinding dry separation craft to a kind of refractory iron ore online, specifically includes following steps：
A. -15mm Orebody in Jingtieshan refractory iron ores are milled to -0.074mm accountings 49%, magnetizing roast, roasting is carried out using shower furnace
650 DEG C of time 6min, sintering temperature, roasted ore are cooled to 55 DEG C, scaling loss 9%, roasted ore grade 37.36%, roasted ore yield
91%；
B. roasted ore is carried out using screw dry magnetic separator dry type pre-selection throw it is useless, throw waste product position 7.69%, throw useless yield 11%,
Throw useless pre-selection concentrate grade 41.03%, throw useless pre-selection concentrate yield 89%.
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.
75.98%, one section of one section of selected Oe of field strength 3000, concentrate grade 51.36%, concentrate yield concentrate gross production rate
67.62%th, 24.02%, one section of tailings grade 8.35%, mine tailing yield mine tailing gross production rate 21.38%；
Two sections of selected Oe of field strength 2500, concentrate grade 55.32%, concentrate yield 89.96%, two section of concentrate gross production rate 60.83%, tail
10.04%, two section of ore deposit grade 15.88%, mine tailing yield mine tailing gross production rate 6.79%；
Three sections of selected Oe of field strength 2200, concentrate grade 60.11%, concentrate yield 88.59%, three section of concentrate gross production rate 53.89%, tail
11.41%, three section of ore deposit grade 18.13%, mine tailing yield mine tailing gross production rate 6.94%, the total metal recovery rate 86.70% 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
18.74%th, yield 13.73%, enrichment concentrate grade 29.58%, yield 51.78%, gross production rate 7.11%, enrichment tailings grade
7.09%th, yield 48.22%, gross production rate 6.62%.
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 7.95%, gross production rate 41.11%.
Enrichment concentrate returns to shower furnace roasting system and is calcined, and 650 DEG C of sintering temperature, roasting time 50min, cold-zone is extremely
Normal temperature, former dry grinding dry separation system is returned to, form closed cycle roasting dry grinding dry separation craft.
Final iron concentrate grade 60.11%, yield 56.89%, the metal recovery rate of obtaining is up to 91.53%.
Claims (3)
1. closed circuit shower furnace is calcined dry grinding dry separation craft to a kind of refractory iron ore online, it is characterised in that：Specifically include following step
Suddenly：
Step A. carries out magnetizing roast, roasting using shower furnace to being milled to -0.074mm accounting 45-50% refractory iron ores miberal powder
Ore deposit is cooled to less than 57 DEG C；
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. throws the pre- concentrate selection after giving up by dry grinding, -0.074mm accounting 70-80% is milled to, through flat board wind magnetic joint dry separation
Three sections of dry types of machine are selected, and three sections of selected rear concentrate are final qualified concentrate containing, and grade reaches more than 60%；
Dry-dressing machine is selected two sections for step D. flat board wind magnetic joint, three sections of mine tailings after the enrichment of screw dry magnetic separator, be enriched with mine tailing
Together discharged with one section of mine tailing, the useless rear barren rock of throwing by qualified tailings, Iron Grade of Tailings control is below 8%；
Concentrate return to step A shower furnace calcining magnetic separation system continues magnetizing roast after step E. enrichments, realizes online closed circuit magnetic
Change roasting, dry grinding dry separation.
2. closed circuit shower furnace roasting 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 or above-mentioned
The symbiotic iron ore stone of iron ore.
3. closed circuit shower furnace roasting 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, de- magnetic is carried out to previous stages of magnetic separation processing iron ore concentrate.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108531717A (en) * | 2018-04-19 | 2018-09-14 | 长沙矿冶研究院有限责任公司 | A method of Refractory red iron ores are handled based on graded combination magnetizing roast |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108531717A (en) * | 2018-04-19 | 2018-09-14 | 长沙矿冶研究院有限责任公司 | A method of Refractory red iron ores are handled based on graded combination magnetizing roast |
| 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 |
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