CN105689126A - Mineral processing process for oolitic hematite - Google Patents

Mineral processing process for oolitic hematite Download PDF

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Publication number
CN105689126A
CN105689126A CN201610138658.8A CN201610138658A CN105689126A CN 105689126 A CN105689126 A CN 105689126A CN 201610138658 A CN201610138658 A CN 201610138658A CN 105689126 A CN105689126 A CN 105689126A
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concentrate
rough concentrate
ore
magnetic separator
ores
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CN105689126B (en
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庞玉荣
郭秀平
李朝晖
田江涛
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Hebei geological experiment and Testing Center
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Hebei Central Laboratory Of Geology And Mineral Resources
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00Magnetic separation
    • B03C1/02Magnetic separation acting directly on the substance being separated
    • B03C1/30Combinations with other devices, not otherwise provided for

Abstract

The invention discloses a mineral processing process for oolitic hematite. The mineral processing process comprises the following steps: crushing raw ores into ores with a grain size smaller than 5mm in a crusher, and then, roasting the ores for at least one hour in a fuel gas rotary kiln with a temperature being 500-550 DEG C; grinding the ores until the content of the ores with the grain size smaller than 0.074mm is 34%, and carrying out low intensity magnetic separation on the ores by use of a wet magnetic separator to magnetically separate iron rough concentrate 1 and tailings 1; introducing the iron rough concentrate 1 into a vibrating sieve to sieve, wherein qualified iron concentrate 1 is over the vibrating sieve, and magnetic separation column concentration is firstly carried out under the vibrating sieve; concentrating iron rough concentrate 2 and tailings 2; grinding the iron rough concentrate 2 until the content of the iron rough concentrate 2 with grain size smaller than 0.074mm is 75%, and carrying out secondary magnetic separation column concentration to concentrate iron rough concentrate 3 and middlings 1; and carrying out tertiary magnetic separation column concentration on the iron rough concentrate 3 to concentrate the iron rough concentrate 2 and the tailings 2. The mineral processing process is simple and is low in cost, is environmentally-friendly and is high in return water utilization rate as no chemical is needed to be added.

Description

A kind of oolitic hematite ore-dressing technique
Technical field
The invention belongs to technical field of beneficiation, relate to a kind of oolitic hematite ore-dressing technique。
Background technology
Existing rhombohedral iron ore beneficiation technics such as Jingtieshan Iron Mine stone adopts lump ore calcining magnetic separation (150~15mm grade), the technique of fine ore high intensity magnetic separation (15~0mm grade) processes。Lump ore roasting apparatus is 100m3Anshan type reduction magnetization vertical baking furnace, sintering temperature 650 DEG C-700 DEG C, roasting flow process is closed circuit magnetizing roast;Grinding process is three sections of stage grindings, and mog is that granularity accounts for 93.81% at below 0.045mm;Sorting process is rough concentrate after four magnetic separation to Flowsheet of cationic indirect flotation, introduces, by the concentrate of the 4th magnetic separation, reverse flotation system of regrinding。Regrinding is formed grind grading loop by ball mill and hydrocyclone, and flotation flowsheet is one roughing, primary cleaning, scans reverse flotation flowsheet four times。Flotation to ore deposit grade 55.76% when, concentrate grade 60.61%, SiO2Content 5.76%, tailings grade 24.16%, flotation operation iron recovery 94.23%。This mill selects technique mog carefully to cause ore grinding cost height, Beneficiation flowsheet length to cause beneficiation cost high。Reverse flotation work needs to add floating agent, and the waste water of generation can not be recycled, and waste water reclamation utilization rate is low。
Summary of the invention
The purpose of the present invention solves the above-mentioned problems in the prior art exactly, it is provided that a kind of technique is simple, cost is low, need not add any medicament, environmental protection, the oolitic hematite ore-dressing technique that recycling water utilization rate is high。
For achieving the above object, the technical solution of the present invention is: a kind of oolitic hematite ore-dressing technique, it comprises the following steps: raw ore is broken into the granularity of below 5mm by (1) in disintegrating machine, by Ore roasting at least 1 hour in combustion gas rotary kiln after broken, sintering temperature is 500~550 DEG C;(2) Ore after roasting carrying out ore grinding and account for 34% to the following content of granularity 0.074mm, then use wet magnetic separator to carry out low intensity magnetic separation, magnetic separation is tapped a blast furnace rough concentrate 1 and mine tailing 1;(3) the ferrum rough concentrate 1 magneticly elected enters vibrosieve and sieves, and Vibration Screen screen distance is at 0.7mm~1mm;The product in face is qualified iron ore concentrate 1 on the vibrating, and it is selected that the intermediate products below vibrosieve enter column magnetic separator first;(4) selected rough concentrate 2 and the mine tailing 2 of tapping a blast furnace of column magnetic separator;The ferrum rough concentrate 2 chosen by column magnetic separator is regrinded to the following content of granularity 0.074mm and is accounted for 75%, carry out second time column magnetic separator selected, selected rough concentrate 3 and the chats 1 of tapping a blast furnace;(5) to carry out third time column magnetic separator selected for the second time ferrum rough concentrate 3 chosen of column magnetic separator, chooses qualified iron ore concentrate 2 and chats 2。
By chats 1 described above and chats is 2-in-1 and after return to wet magnetic separator and proceed low intensity magnetic separation。
Wet magnetic separator low intensity magnetic separation magnetic field intensity described above is 120kA/m。
(1) present invention adopts combustion gas rotary kiln, under low temperature (500 DEG C-550 DEG C) condition, oolitic hematite is carried out magnetizing roast。After roasting, iron mine magnetic efficiency is good, and roasting condition is wider, simple to operate, on-the-spot strong adaptability, is suitable for large-scale industrial production。(2) present invention adopts vibrosieve and column magnetic separator equipment, and for bloodstone roasted ore magnetic separation cleaning technological flowasheet, test effect is excellent。Utilize that roasted ore coercivity is strong, the feature of easy magnetic coagulation; under corase grind (granularity accounts for 34% at the content of below 0.074mm) condition; wet magnetic separator is adopted to roughly select (magnetic field intensity is 120kA/m); magnetic iron ore will form " magnetic coagulation " in sorting process; so can catch microfine monomer magnetite ore particles; avoid the thin mud loss of magnetic iron ore, guarantee the response rate when roughly selecting。Adopt vibrosieve selected rough concentrate, closed circuit different from traditional ball mill-vibrosieve classification, here used by oscillating screen is in sorting operation, vibrosieve adopts large aperture (0.7mm~1mm) screen cloth, " magnetic coagulation " that formed by fine fraction magnetic iron ore is isolated on sieve, form qualified iron ore concentrate 1, intergrowth and gangue mineral (less than 0.7mm) that magnetic is more weak become undersize and enter second segment grinding operation, the qualified iron ore concentrate of productivity about 32~42% can be obtained in advance, only have the intermediate products of productivity 11~14% to enter next section and regrind selected operation, considerably reduce mill and hank this;Selected operation of regrinding adopts column magnetic separator selected, column magnetic separator energy fully dispersed remaining " magnetic coagulation " is to eliminate the lean intergrowth of monomer stone-like pulse and magnetic iron ore and the stone-like pulse being entrained in magnetic coagulation, the phenomenon overcoming the magnetic separation process choosing caused due to magnetic coagulation to reduce, plays selected effect。
In a word, present invention process is simple, cost is low;The mine-supplying quantity of second segment grinding-concentration operation is few, and ore grinding, beneficiation cost are greatly lowered, and second segment grinding-concentration operating cost can reduce about 50%;Screening magnetic separation process is compared with magnetic separation-reverse floatation process, it is not necessary to add any medicament, belongs to process for cleanly preparing;Because any medicament need not be added, so recycling water utilization rate is high。
Accompanying drawing explanation
Fig. 1 is the production technology figure of the present invention。
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention will be further described。
Embodiment 1, as it is shown in figure 1, the present embodiment comprises the following steps: raw ore is broken into the granularity of below 5mm by (1) in disintegrating machine, by Ore roasting 1 hour in combustion gas rotary kiln after broken, sintering temperature is 500 DEG C。(2) Ore after roasting carrying out ore grinding and account for 34% to the following content of granularity 0.074mm, then use wet magnetic separator to carry out low intensity magnetic separation, magnetic separation is tapped a blast furnace rough concentrate 1 and mine tailing 1。It is further preferred that described wet magnetic separator low intensity magnetic separation magnetic field intensity is 120kA/m。(3) the ferrum rough concentrate 1 magneticly elected enters vibrosieve and carries out screening sorting, and Vibration Screen screen distance is at 0.7mm;The product in face is qualified iron ore concentrate 1 on the vibrating, and it is selected that the intermediate products below vibrosieve enter column magnetic separator first, and the flushing water speed of column magnetic separator is 80ml/s。(4) selected rough concentrate 2 and the mine tailing 2 of tapping a blast furnace of column magnetic separator;The ferrum rough concentrate 2 chosen by column magnetic separator is regrinded to the following content of granularity 0.074mm and is accounted for 75%, carry out second time column magnetic separator selected, the flushing water speed of column magnetic separator is 160ml/s, selected rough concentrate 3 and the chats 1 of tapping a blast furnace;(5) to carry out third time column magnetic separator selected for the second time ferrum rough concentrate 3 chosen of column magnetic separator, chooses qualified iron ore concentrate 2 and chats 2。Qualified iron ore concentrate 1 productivity 34.20%, TFe grade 62.65%, the response rate 48.60%;Qualified iron ore concentrate 2 productivity 24.93%, TFe grade 61.33%, the response rate 34.68%;Chats 1 and chats is 2-in-1 and after chats productivity 12.64%, TFe grade 34.70%, the response rate 9.95%;Mine tailing 1 productivity 23.08%, TFe grade 10.26%, the response rate 5.37%;Mine tailing 2 productivity 5.15%, TFe grade 11.99%, the response rate 5.37%。To 100 tons of hematites, cost reduces by 51%。It is further preferred that by described chats 1 and chats is 2-in-1 and after return to wet magnetic separator and proceed low intensity magnetic separation。
Embodiment 2, as it is shown in figure 1, the present embodiment comprises the following steps: raw ore is broken into the granularity of below 5mm by (1) in disintegrating machine, by Ore roasting at least 1 hour in combustion gas rotary kiln after broken, sintering temperature is 530 DEG C。(2) Ore after roasting carrying out ore grinding and account for 34% to the following content of granularity 0.074mm, then use wet magnetic separator to carry out low intensity magnetic separation, magnetic separation is tapped a blast furnace rough concentrate 1 and mine tailing 1。It is further preferred that described wet magnetic separator low intensity magnetic separation magnetic field intensity is 120kA/m。(3) the ferrum rough concentrate 1 magneticly elected enters vibrosieve and carries out screening sorting, and Vibration Screen screen distance is at 0.8mm;The product in face is qualified iron ore concentrate 1 on the vibrating, and it is selected that the intermediate products below vibrosieve enter column magnetic separator first, and the flushing water speed of column magnetic separator is 80ml/s。(4) selected rough concentrate 2 and the mine tailing 2 of tapping a blast furnace of column magnetic separator;The rough concentrate 2 chosen by column magnetic separator is regrinded to the following content of granularity 0.074mm and is accounted for 75%, carry out second time column magnetic separator selected, the flushing water speed of column magnetic separator is 160ml/s, selected rough concentrate 3 and the chats 1 of tapping a blast furnace。(5) to carry out third time column magnetic separator selected for the second time ferrum rough concentrate 3 chosen of column magnetic separator, chooses qualified iron ore concentrate 2 and chats 2。Iron ore concentrate 1 productivity 42.39%, TFe grade 62.59%, the response rate 59.36%;Iron ore concentrate 2 productivity 15.87%, TFe grade 61.16%, the response rate 21.71%;Chats 1 and chats is 2-in-1 and after chats productivity 10.89%, TFe grade 37.94%, the response rate 9.24%;Mine tailing 1 productivity 25.35%, TFe grade 13.37%, the response rate 7.58%;Mine tailing 2 productivity 5.49%, TFe grade 17.17%, the response rate 2.11%;Roasted product productivity 100%, TFe grade 44.71%, the response rate 100%。To 100 tons of hematites, cost reduces by 64%。It is further preferred that by described chats 1 and chats is 2-in-1 and after return to wet magnetic separator and proceed low intensity magnetic separation。
Embodiment 3, as it is shown in figure 1, the present embodiment comprises the following steps: raw ore is broken into the granularity of below 5mm by (1) in disintegrating machine, by Ore roasting at least 1 hour in combustion gas rotary kiln after broken, sintering temperature is 550 DEG C。(2) Ore after roasting carrying out ore grinding and account for 34% to the following content of granularity 0.074mm, then use wet magnetic separator to carry out low intensity magnetic separation, magnetic separation is tapped a blast furnace rough concentrate 1 and mine tailing 1。Described wet magnetic separator low intensity magnetic separation magnetic field intensity is 120kA/m。(3) the ferrum rough concentrate 1 magneticly elected enters vibrosieve and sieves, and Vibration Screen screen distance is at 1mm;The product in face is qualified iron ore concentrate 1 on the vibrating, and it is selected that the intermediate products below vibrosieve enter column magnetic separator first, and the flushing water speed of column magnetic separator is 80ml/s。(4) selected rough concentrate 2 and the mine tailing 2 of tapping a blast furnace of column magnetic separator;The ferrum rough concentrate 2 chosen by column magnetic separator is regrinded to the following content of granularity 0.074mm and is accounted for 75%, carry out second time column magnetic separator selected, the flushing water speed of column magnetic separator is 160ml/s, selected rough concentrate 3 and the chats 1 of tapping a blast furnace。(5) to carry out third time column magnetic separator selected for the second time ferrum rough concentrate 3 chosen of column magnetic separator, chooses qualified iron ore concentrate 2 and chats 2。Qualified iron ore concentrate 1 productivity 32.32%, TFe grade 62.61%, the response rate 44.84%;Qualified iron ore concentrate 2 productivity 26.64%, TFe grade 61.32%, the response rate 36.19%;Chats productivity 14.04%, TFe grade 34.49%, the response rate 10.73%;Mine tailing 1 productivity 24.14%, TFe grade 14.03%, the response rate 7.50%;Mine tailing 2 productivity 2.86%, TFe grade 11.65%, the response rate 0.74%;Roasted product productivity 100%, TFe grade 45.13%, the response rate 100%。To 100 tons of hematites, cost reduces by 46%。It is further preferred that by described chats 1 and chats is 2-in-1 and after return to wet magnetic separator and proceed low intensity magnetic separation。
Embodiment described above is only preferably and example shape, all make within the spirit and principles in the present invention any amendment, be equal to replacement, improvement etc., it is all in the protection domain of this patent。

Claims (3)

1. an oolitic hematite ore-dressing technique, it is characterized in that: it comprises the following steps: raw ore is broken into the granularity of below 5mm by (1) in disintegrating machine, by Ore roasting at least 1 hour in combustion gas rotary kiln after broken, sintering temperature is 500~550 DEG C;(2) Ore after roasting carrying out ore grinding and account for 34% to the following content of granularity 0.074mm, then use wet magnetic separator to carry out low intensity magnetic separation, magnetic separation is tapped a blast furnace rough concentrate 1 and mine tailing 1;(3) the ferrum rough concentrate 1 magneticly elected enters vibrosieve and sieves, and Vibration Screen screen distance is at 0.7mm~1mm;The product in face is qualified iron ore concentrate 1 on the vibrating, and it is selected that the intermediate products below vibrosieve enter column magnetic separator first;(4) selected rough concentrate 2 and the mine tailing 2 of tapping a blast furnace of column magnetic separator;The ferrum rough concentrate 2 chosen by column magnetic separator is regrinded to the following content of granularity 0.074mm and is accounted for 75%, carry out second time column magnetic separator selected, selected rough concentrate 3 and the chats 1 of tapping a blast furnace;(5) to carry out third time column magnetic separator selected for the second time ferrum rough concentrate 3 chosen of column magnetic separator, chooses qualified iron ore concentrate 2 and chats 2。
2. oolitic hematite ore-dressing technique according to claim 1, it is characterised in that: in described combustion gas rotary kiln, roasting is to carry out under low temperature (500~550 DEG C) condition。
3. oolitic hematite ore-dressing technique according to claim 1, it is characterised in that: described is not intended to simple classification by ferrum rough concentrate 1 bolting, but by used by oscillating screen in separation operation, obtains qualified iron ore concentrate 1 under coarsely graded condition。
CN201610138658.8A 2016-05-11 2016-05-11 A kind of oolitic hematite ore-dressing technique Active CN105689126B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107365904A (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 iron ore shaft roasting magnetic separation flotation tailing recycles technique
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
CN109317289A (en) * 2018-11-14 2019-02-12 王光领 Dry sand medium preparation process is used on air dry sand Recognition Applied in Coal Preparation System
CN115055276A (en) * 2022-06-09 2022-09-16 赣州金环磁选科技装备股份有限公司 Technological process for physical separation of oolitic hematite

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EP0237689A1 (en) * 1986-02-28 1987-09-23 MANNESMANN Aktiengesellschaft Process for the production of finely divided fuel
CN101440416A (en) * 2008-12-18 2009-05-27 周玉平 Iron increase and phosphorous reduction method for oolitic high phosphorus hematite
CN101767057A (en) * 2008-12-30 2010-07-07 中国地质科学院郑州矿产综合利用研究所 Method for separating aluminum and iron in high-iron bauxite
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Publication number Priority date Publication date Assignee Title
CN107365904A (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 iron ore shaft roasting magnetic separation flotation tailing recycles technique
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
CN107365904B (en) * 2017-07-11 2019-01-25 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of iron ore shaft roasting magnetic separation flotation tailing recycling technique
CN107377205B (en) * 2017-07-11 2019-03-12 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
CN109317289A (en) * 2018-11-14 2019-02-12 王光领 Dry sand medium preparation process is used on air dry sand Recognition Applied in Coal Preparation System
CN115055276A (en) * 2022-06-09 2022-09-16 赣州金环磁选科技装备股份有限公司 Technological process for physical separation of oolitic hematite

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