CN104607308A - Beneficiation method for high carbonate iron ore - Google Patents

Beneficiation method for high carbonate iron ore Download PDF

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Publication number
CN104607308A
CN104607308A CN201510044475.5A CN201510044475A CN104607308A CN 104607308 A CN104607308 A CN 104607308A CN 201510044475 A CN201510044475 A CN 201510044475A CN 104607308 A CN104607308 A CN 104607308A
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magnetic separation
intensity magnetic
concentrate
iron
rough
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CN201510044475.5A
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Chinese (zh)
Inventor
邓鹏宏
韩跃新
姚强
薛敏
解治宇
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Angang Group Mining Co Ltd
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Angang Group Mining Co Ltd
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Priority to CN201510044475.5A priority Critical patent/CN104607308A/en
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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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage

Abstract

Provided is a beneficiation method for high carbonate iron ore, and belongs to the technical field of the mineral processing. The method comprises the following steps: firstly, ore grinding processing is carried out on the high carbonate iron ore after the carbonate iron ore is crushed; secondly, weak magnetic separation, first-stage strong magnetic separation and second-stage strong magnetic separation are carried out on hierarchic flooding products to separate tailings, and concentrates are merged to be used as mixed roughs; thirdly, filtration is carried out on the mixed roughs, heating is carried out to eliminate water, heat preservation is carried out on the mixed roughs for three min to sixty min under a reducing atmosphere condition, and air cooling is carried out on the mixed roughs; fourthly, ore pulp is prepared by adding water, and pre-selection is carried out after stirring; fifthly, fine selection is carried out by an electromagnetic fine selecting machine after fine grinding is carried out, and water is eliminated by filtration. According to the method, the strong magnetic separation and the weak magnetic separation are adopted, baking and reducing are carried out, pre-selection, namely, ore grinding and fine selecting, is carried out, and the products with iron grade larger than sixty percent are obtained. The method has the advantages that the product index is stable, the economical efficiency is good, and resources can be efficiently utilized.

Description

A kind of beneficiation method of iron ore of high-carbon hydrochlorate
Technical field
The invention belongs to technical field of mineral processing, particularly a kind of beneficiation method of iron ore of high-carbon hydrochlorate.
Background technology
Nearly 1,000,000,000 tons of Golconda iron ore reserves are closed in Anshan Iron and Steel Group of mining company.Close the Anshan type iron mine stone that Golconda iron ore belongs to high-carbon hydrochlorate, iron mineral is wherein mainly siderite, bloodstone and a small amount of magnetic iron ore, the content of siderite (i.e. carbonate) is usually between 30 ~ 60%, separately there are a small amount of argillaceous hematite and limonite, also contain a small amount of pyrite and micro-chalcopyrite in sample in addition, all the other are nonmetallic mineral.Wherein siderite, bloodstone and magnetic iron ore are main ferrous mineral, and the Khenpo granularity of bloodstone and magnetic iron ore is smaller, and main and gangue mineral adhesion, bloodstone and magnetic iron ore are the less of adhesion relation.Bloodstone and magnetic iron ore have certain washability.Bloodstone in raw ore and the granularity of magnetic iron ore superfine, be mainly distributed in the following grade of 400 order, only have a small amount of iron mineral to be distributed in the above grade of 200 order.
Current pass Golconda iron ore has built up ore dressing plant, and the index in ore dressing plant is head grade 31.15%, and final concentrate grade 64%, true tailings grade reaches 20%, and the rate of recovery is less than 60%, and resource utilization is lower, and production cost is higher.
Summary of the invention
For the problems referred to above that the technique of preparing of the Anshan type iron mine stone of existing high-carbon hydrochlorate exists, the invention provides a kind of beneficiation method of iron ore of high-carbon hydrochlorate, by the mode of preconcentration, heat reduction and magnetic separation, while reducing costs, improve yield and also obtain high grade iron mineral products.
The beneficiation method of the iron ore of high-carbon hydrochlorate of the present invention is carried out according to the following steps:
1, the iron ore of high-carbon hydrochlorate is crushed to granularity at 2 ~ 15mm, put into the closed circuit grinding system that ball mill and cyclone form and carry out ore grinding process, the part obtaining granularity-0.074mm in Grading Overflow product accounts for 60 ~ 90% of the iron ore gross weight of high-carbon hydrochlorate; The Iron grade of the iron ore of described high-carbon hydrochlorate is 20 ~ 30%, and wherein the weight content of carbonate is 30 ~ 60%;
2, Grading Overflow product is carried out low intensity magnetic separation by weak magnetic separator, obtain low intensity magnetic separation concentrate and low intensity magnetic separation mine tailing, low intensity magnetic separation mine tailing is carried out one section of high intensity magnetic separation by one section of intensity magnetic separator, obtain one section of high intensity magnetic separation concentrate and one section of high intensity magnetic separation mine tailing, one section of high intensity magnetic separation mine tailing is carried out two sections of high intensity magnetic separations by two sections of intensity magnetic separators, obtain two sections of high intensity magnetic separation concentrate and two sections of high intensity magnetic separation mine tailings, one section of high intensity magnetic separation concentrate, two sections of high intensity magnetic separation concentrate and low intensity magnetic separation concentrate are merged as mixing rough;
3, will mix rough filter obtain water weight 10 ~ 20% filter cake, then be heated to 550 ~ 700 DEG C of insulation 20 ~ 150s and remove moisture, make carbonate decomposition and preliminary election mixing rough middle iron content mineral convert bloodstone to, then 3 ~ 60min is incubated under being placed in reducing atmosphere condition, air cooling is to lower than 50 DEG C again, obtains magnet rough;
4, rough for magnet adding water is made the ore pulp of weight concentration 25 ~ 40%, stir 5 ~ 40min and eliminate Electrostatic Absorption and reunion, then carry out preliminary election with drum magnetic separator, controlling magnetic field intensity is 0.11 ~ 0.3T, and the pre-concentrate selection of acquisition is as rough concentrate;
5, account for more than 95% of rough concentrate gross weight by levigate for rough concentrate to granularity-400 object part, then carry out selected with electromagnetic refiner, the selected concentrate of acquisition filters removes moisture, obtains the concentrate product of Iron grade 63 ~ 68%.
In said method, when carrying out selected with electromagnetic refiner, the electric current controlling electromagnetic refiner is 0.5 ~ 2A, ascending current speed 5 ~ 30cm/s.
Above-mentioned reducing atmosphere is coal gas atmosphere or hydrogen atmosphere.
In said method, the rate of recovery >=80% of iron.
In said method, mix rough Iron grade 40 ~ 55%.
In said method, the rough Iron grade of magnet is 42 ~ 57%.
In said method, the Iron grade of rough concentrate is 58 ~ 63%.
In said method, magnetic field intensity during low intensity magnetic separation is 0.1 ~ 0.3T, and magnetic field intensity when one section of high intensity magnetic separation and two sections of high intensity magnetic separations is 0.8 ~ 1.5T.
Method of the present invention, by high intensity magnetic separation and low intensity magnetic separation, then through roasting and reduction (in heating process, non magnetic bloodstone is converted into magnetic bloodstone), then carries out preliminary election-ore grinding and selected, obtain the product that Iron grade is greater than 65%, product index is stablized, and good economy performance, resource can obtain efficiency utilization.
Accompanying drawing explanation
Fig. 1 is the beneficiation method schematic flow sheet of the iron ore of high-carbon hydrochlorate of the present invention.
Detailed description of the invention
The ball mill adopted in the embodiment of the present invention is tumbling ball mill, and ball-milling medium is steel ball or steel forging.
The one section of intensity magnetic separator adopted in the embodiment of the present invention and two sections of intensity magnetic separators are Slon and found ring electromagnetic pulsating high gradient magnetic separator.
The electromagnetic refiner adopted in the embodiment of the present invention is DFXL-II type electromagnetic refiner.
When carrying out ore grinding process in the embodiment of the present invention, ore milling concentration when ball mill carries out ball milling is 70 ~ 80%, and ore deposit pressure during cyclone classification is 0.15 ~ 0.5MPa.
The raw material selected in the embodiment of the present invention is the Anshan type iron mine stone of the high-carbon hydrochlorate closing Golconda, and carry out chemical spectrum semi-quantitative analysis and chemical multielement analysis, result is: TFe 28 ~ 29wt %, FeO 13.5 ~ 14wt %, SiO 247 ~ 48wt %, Mn 0.2 ~ 0.3 wt%, Al 2o 30.6 ~ 0.7wt %, CaO 0.8 ~ 0.9wt %, MgO 0.7 ~ 0.8wt %, all the other are S, P and K 2o; Analysis result shows to put forward the main task that Fe and reducing Si is this iron ore of sorting.
The Anshan type iron mine stone closing the high-carbon hydrochlorate of Golconda carries out material phase analysis result as table 1;
Table 1
Result of the test shows that the iron in this ore is mainly composed and is stored in red (brown) iron ore and ferric carbonate, and a small amount of iron is composed and is stored in magnetic iron ore, separately has the iron of trace to compose and is stored in iron sulfide and ferrosilite.
Embodiment 1
The Anshan type iron mine stone of high-carbon hydrochlorate is crushed to granularity at 2 ~ 15mm, put into the closed circuit grinding system that ball mill and cyclone form and carry out ore grinding process, the part obtaining granularity-0.074mm in Grading Overflow product accounts for 60% of the Anshan type iron mine stone gross weight of high-carbon hydrochlorate; The Iron grade of the Anshan type iron mine stone of described high-carbon hydrochlorate is 30%, and wherein the weight content of carbonate is 30%;
Grading Overflow product is carried out low intensity magnetic separation by weak magnetic separator, obtain low intensity magnetic separation concentrate and low intensity magnetic separation mine tailing, low intensity magnetic separation mine tailing is carried out one section of high intensity magnetic separation by one section of intensity magnetic separator, obtain one section of high intensity magnetic separation concentrate and one section of high intensity magnetic separation mine tailing, one section of high intensity magnetic separation mine tailing is carried out two sections of high intensity magnetic separations by two sections of intensity magnetic separators, obtain two sections of high intensity magnetic separation concentrate and two sections of high intensity magnetic separation mine tailings, one section of high intensity magnetic separation concentrate, two sections of high intensity magnetic separation concentrate and low intensity magnetic separation concentrate are merged as mixing rough; Mix rough Iron grade 55%; Magnetic field intensity during low intensity magnetic separation is 0.3T, and magnetic field intensity when one section of high intensity magnetic separation and two sections of high intensity magnetic separations is 1.5T;
The filter cake of rough filtration acquisition water weight 10% will be mixed, adopt suspending magnetization roasting furnace to be heated to 700 DEG C of insulation 20s and remove moisture, make carbonate decomposition and the mineral of the rough middle iron content of preliminary election mixing convert bloodstone to and are then placed in High-temperature mineral powder cooling device, 3min is incubated under reducing atmosphere condition, air cooling is to lower than 50 DEG C again, obtains magnet rough; The rough Iron grade of magnet is 57%; Reducing atmosphere is coal gas atmosphere;
Rough for magnet adding water is made the ore pulp of weight concentration 40%, and stir 40min and eliminate Electrostatic Absorption and reunion, then carry out preliminary election with drum magnetic separator, controlling magnetic field intensity is 0.3T, and the pre-concentrate selection of acquisition is as rough concentrate; The Iron grade of rough concentrate is 58%;
96% of rough concentrate gross weight is accounted for granularity-400 object part by levigate for rough concentrate, then carry out selected with electromagnetic refiner, the electric current controlling electromagnetic refiner is 2A, ascending current speed 30cm/s, the selected concentrate obtained filters removes moisture, obtain the concentrate product of Iron grade 63%, the rate of recovery >=80% of iron.
Embodiment 2
Method is with embodiment 1, and difference is:
(1) Iron grade of the Anshan type iron mine stone of high-carbon hydrochlorate is 28%, and wherein the weight content of carbonate is 35%; The part obtaining granularity-0.074mm in Grading Overflow product accounts for 70% of the Anshan type iron mine stone gross weight of high-carbon hydrochlorate;
(2) rough Iron grade is mixed 52%; Magnetic field intensity during low intensity magnetic separation is 0.3T, and magnetic field intensity when one section of high intensity magnetic separation and two sections of high intensity magnetic separations is 1.2T;
(3) rough for mixing filtration is obtained water weight at the filter cake of 15%, be then heated to 680 DEG C of insulation 30s, be incubated 10min under being placed in reducing atmosphere condition, then air cooling be extremely lower than 50 DEG C; The rough Iron grade of magnet is 55%; Reducing atmosphere is hydrogen atmosphere;
(4) rough for magnet adding water is made the ore pulp of weight concentration 40%, stir 35min, preliminary election controlling magnetic field intensity is 0.25T; The Iron grade of rough concentrate is 59%;
(5) account for 97% of rough concentrate gross weight by levigate for rough concentrate to granularity-400 object part, the electric current of selected control electromagnetic refiner is 1.5A, ascending current speed 30cm/s, obtains the concentrate product of Iron grade 65%, the rate of recovery >=80% of iron.
Embodiment 3
Method is with embodiment 1, and difference is:
(1) Iron grade of the Anshan type iron mine stone of high-carbon hydrochlorate is 25%, and wherein the weight content of carbonate is 45%; The part obtaining granularity-0.074mm in Grading Overflow product accounts for 75% of the Anshan type iron mine stone gross weight of high-carbon hydrochlorate;
(2) rough Iron grade is mixed 47%; Magnetic field intensity during low intensity magnetic separation is 0.2T, and magnetic field intensity when one section of high intensity magnetic separation and two sections of high intensity magnetic separations is 1.2T;
(3) rough for mixing filtration is obtained water weight at the filter cake of 15%, be then heated to 650 DEG C of insulation 60s, be incubated 15min under being placed in reducing atmosphere condition, then air cooling be extremely lower than 50 DEG C; The rough Iron grade of magnet is 50%; Reducing atmosphere is coal gas atmosphere;
(4) rough for magnet adding water is made the ore pulp of weight concentration 35%, stir 30min, preliminary election controlling magnetic field intensity is 0.2T; The Iron grade of rough concentrate is 60%;
(5) account for 96% of rough concentrate gross weight by levigate for rough concentrate to granularity-400 object part, the electric current of selected control electromagnetic refiner is 1.5A, ascending current speed 20cm/s, obtains the concentrate product of Iron grade 66%, the rate of recovery >=80% of iron.
Embodiment 4
Method is with embodiment 1, and difference is:
(1) Iron grade of the Anshan type iron mine stone of high-carbon hydrochlorate is 22%, and wherein the weight content of carbonate is 55%; The part obtaining granularity-0.074mm in Grading Overflow product accounts for 80% of the Anshan type iron mine stone gross weight of high-carbon hydrochlorate;
(2) rough Iron grade is mixed 43%; Magnetic field intensity during low intensity magnetic separation is 0.2T, and magnetic field intensity when one section of high intensity magnetic separation and two sections of high intensity magnetic separations is 1.0T;
(3) rough for mixing filtration is obtained water weight at the filter cake of 20%, be then heated to 600 DEG C of insulation 120s, be incubated 30min under being placed in reducing atmosphere condition, then air cooling be extremely lower than 50 DEG C; The rough Iron grade of magnet is 45%; Reducing atmosphere is hydrogen atmosphere;
(4) rough for magnet adding water is made the ore pulp of weight concentration 30%, stir 20min, preliminary election controlling magnetic field intensity is 0.18T; The Iron grade of rough concentrate is 62%;
(5) account for 97% of rough concentrate gross weight by levigate for rough concentrate to granularity-400 object part, the electric current of selected control electromagnetic refiner is 1A, ascending current speed 10cm/s, obtains the concentrate product of Iron grade 67%, the rate of recovery >=80% of iron.
Embodiment 5
Method is with embodiment 1, and difference is:
(1) Iron grade of the Anshan type iron mine stone of high-carbon hydrochlorate is 20%, and wherein the weight content of carbonate is 60%; The part obtaining granularity-0.074mm in Grading Overflow product accounts for 90% of the Anshan type iron mine stone gross weight of high-carbon hydrochlorate;
(2) rough Iron grade is mixed 40%; Magnetic field intensity during low intensity magnetic separation is 0.1T, and magnetic field intensity when one section of high intensity magnetic separation and two sections of high intensity magnetic separations is 0.8T;
(3) rough for mixing filtration is obtained water weight at the filter cake of 20%, be then heated to 550 DEG C of insulation 150s, be incubated 60min under being placed in reducing atmosphere condition, then air cooling be extremely lower than 50 DEG C; The rough Iron grade of magnet is 42%; Reducing atmosphere is coal gas atmosphere;
(4) rough for magnet adding water is made the ore pulp of weight concentration 25%, stir 5min, preliminary election controlling magnetic field intensity is 0.11T; The Iron grade of rough concentrate is 63%;
(5) account for 96% of rough concentrate gross weight by levigate for rough concentrate to granularity-400 object part, the electric current of selected control electromagnetic refiner is 0.5A, ascending current speed 5cm/s, obtains the concentrate product of Iron grade 68%, the rate of recovery >=80% of iron.

Claims (7)

1. a beneficiation method for the iron ore of high-carbon hydrochlorate, is characterized in that carrying out according to the following steps:
(1) iron ore of high-carbon hydrochlorate is crushed to granularity at 2 ~ 15mm, put into the closed circuit grinding system that ball mill and cyclone form and carry out ore grinding process, the part obtaining granularity-0.074mm in Grading Overflow product accounts for 60 ~ 90% of the iron ore gross weight of high-carbon hydrochlorate; The Iron grade of the iron ore of described high-carbon hydrochlorate is 20 ~ 30%, and wherein the weight content of carbonate is 30 ~ 60%;
(2) Grading Overflow product is carried out low intensity magnetic separation by weak magnetic separator, obtain low intensity magnetic separation concentrate and low intensity magnetic separation mine tailing, low intensity magnetic separation mine tailing is carried out one section of high intensity magnetic separation by one section of intensity magnetic separator, obtain one section of high intensity magnetic separation concentrate and one section of high intensity magnetic separation mine tailing, one section of high intensity magnetic separation mine tailing is carried out two sections of high intensity magnetic separations by two sections of intensity magnetic separators, obtain two sections of high intensity magnetic separation concentrate and two sections of high intensity magnetic separation mine tailings, one section of high intensity magnetic separation concentrate, two sections of high intensity magnetic separation concentrate and low intensity magnetic separation concentrate are merged as mixing rough;
(3) will mix rough filter obtain water weight 10 ~ 20% filter cake, then be heated to 550 ~ 700 DEG C of insulation 20 ~ 150s and remove moisture, make carbonate decomposition and preliminary election mixing rough middle iron content mineral convert bloodstone to, then 3 ~ 60min is incubated under being placed in reducing atmosphere condition, air cooling is to lower than 50 DEG C again, obtains magnet rough;
(4) rough for magnet adding water is made the ore pulp of weight concentration 25 ~ 40%, stir 5 ~ 40min and eliminate Electrostatic Absorption and reunion, then carry out preliminary election with drum magnetic separator, controlling magnetic field intensity is 0.11 ~ 0.3T, and the pre-concentrate selection of acquisition is as rough concentrate;
(5) account for more than 95% of rough concentrate gross weight by levigate for rough concentrate to granularity-400 object part, then carry out selected with electromagnetic refiner, the selected concentrate of acquisition filters removes moisture, obtains the concentrate product of Iron grade 63 ~ 68%.
2. the beneficiation method of the iron ore of a kind of high-carbon hydrochlorate according to claim 1, when it is characterized in that carrying out selected with electromagnetic refiner, the electric current controlling electromagnetic refiner is 0.5 ~ 2A, ascending current speed 5 ~ 30cm/s.
3. the beneficiation method of the iron ore of a kind of high-carbon hydrochlorate according to claim 1, is characterized in that the rough Iron grade of described mixing is 40 ~ 55%.
4. the beneficiation method of the iron ore of a kind of high-carbon hydrochlorate according to claim 1, is characterized in that the rough Iron grade of described magnet is 42 ~ 57%.
5. the beneficiation method of the iron ore of a kind of high-carbon hydrochlorate according to claim 1, is characterized in that the Iron grade of described rough concentrate is 58 ~ 63%.
6. the beneficiation method of the iron ore of a kind of high-carbon hydrochlorate according to claim 1, is characterized in that the rate of recovery >=80% of iron.
7. the beneficiation method of the iron ore of a kind of high-carbon hydrochlorate according to claim 1, magnetic field intensity when it is characterized in that low intensity magnetic separation in step (2) is 0.1 ~ 0.3T, and magnetic field intensity when one section of high intensity magnetic separation and two sections of high intensity magnetic separations is 0.8 ~ 1.5T.
CN201510044475.5A 2015-01-29 2015-01-29 Beneficiation method for high carbonate iron ore Pending CN104607308A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105233974A (en) * 2015-11-05 2016-01-13 鞍钢集团矿业公司 Fine grinding magnetic separation-roasting-regrinding magnetic separation tailing recovery process
CN105233976A (en) * 2015-11-05 2016-01-13 鞍钢集团矿业公司 Tailing recovery process adopting preconcentration-roasting-regrinding and magnetic separation method
CN105233977A (en) * 2015-11-05 2016-01-13 鞍钢集团矿业公司 Tailing recovery process adopting magnetic separation-circulating roasting-regrinding and magnetic separation method
CN107930843A (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 suspension roasting dry type preliminary rejection is returned mine stove method of roasting again

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
卢冀伟等: "东鞍山含碳酸盐铁矿石分步浮选菱铁矿中矿的焙烧磁选试验研究", 《中国矿业》 *
张汉泉等: "难选赤褐铁矿焙烧-磁选试验研究", 《中国矿业》 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105233974A (en) * 2015-11-05 2016-01-13 鞍钢集团矿业公司 Fine grinding magnetic separation-roasting-regrinding magnetic separation tailing recovery process
CN105233976A (en) * 2015-11-05 2016-01-13 鞍钢集团矿业公司 Tailing recovery process adopting preconcentration-roasting-regrinding and magnetic separation method
CN105233977A (en) * 2015-11-05 2016-01-13 鞍钢集团矿业公司 Tailing recovery process adopting magnetic separation-circulating roasting-regrinding and magnetic separation method
CN105233976B (en) * 2015-11-05 2017-07-28 鞍钢集团矿业有限公司 Magnetic tailing recovery process is regrinded in preenrichment roasting
CN105233974B (en) * 2015-11-05 2017-07-28 鞍钢集团矿业有限公司 Magnetic separation recovery mine tailing technique is regrinded in fine grinding magnetic separation roasting
CN107930843A (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 suspension roasting dry type preliminary rejection is returned mine stove method of roasting again
CN107930843B (en) * 2017-11-28 2019-11-08 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of refractory iron ore suspension roasting dry type preliminary rejection is returned mine furnace method of roasting again

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