CN104673994A - Ore dressing method for roasting magnetized weakly-magnetic iron ores under external-reducer-free conditions - Google Patents
Ore dressing method for roasting magnetized weakly-magnetic iron ores under external-reducer-free conditions Download PDFInfo
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- CN104673994A CN104673994A CN201410178132.3A CN201410178132A CN104673994A CN 104673994 A CN104673994 A CN 104673994A CN 201410178132 A CN201410178132 A CN 201410178132A CN 104673994 A CN104673994 A CN 104673994A
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Abstract
The invention relates to a method for roasting magnetized weakly-magnetic iron ores under external-reducer-free conditions, belonging to the technical field of ore dressing in ore extraction metallurgy. The method comprises the following steps: (1) pulverizing weakly-magnetic iron ores to the required particle size, heating to 700-900 DEG C in a roasting furnace in a controllable nitrogen or argon atmosphere, and naturally cooling; and (2) grinding the roasted ores in the protective atmosphere to the selected particle size, and screening out the iron by low intensity magnetic separation, thereby finally obtaining the iron concentrate. The technical process is simple and convenient. Compared with the conventional reduction roasting furnace, the method does not need any combustion chamber, and does not need to consider the problems of overreduction, insufficient reduction of the ore particle center and the like. The method does not need any external reducer, and saves the fuel or energy. Compared with the existing roasting magnetization technique using C or CO as the reducer, the method has the advantages of low carbon emission, energy saving and environment friendliness, and the energy consumption is only 20% of that of the existing reduction roasting technique.
Description
Technical field
Patent of the present invention relates to a kind of beneficiation method without additional reducing agent roasting magnetization weakly magnetic iron ore under anoxic conditions, belongs to mineral Extraction metallurgy technical field of beneficiation.
Background technology
The weak magnetite reserves such as China's rhombohedral iron ore, limonite, kakoxene, specularite are large, and the low and difficult choosing of most of grade, fails to be used effectively.One of most effective means is separated in gangue by iron ore with low intensity magnetic separation after in reducing atmosphere, the weak magnetite of roasting makes it magnetize.Magnetizing roasting-magnetic separation can reach ore dressing effect fast in ore dressing mode, but reducing roasting has the shortcoming of high, a large amount of discharge carbonic acid gas that consumes energy, and limits large-scale industrial application.
Summary of the invention
The object of the present invention is to provide a kind of consume energy little, cost is low, without under additional reducing agent and anoxia condition roasting magnetization weakly magnetic iron ore beneficiation method.
The present invention includes following steps: weak magnetite ore fragmentation is less than 1mm granularity by (1), 700-900 DEG C can be heated to, naturally cooling in the atmosphere at nitrogen or argon gas in the stoving oven of controlled atmosphere.(2) by the ore after roasting, magneticstrength 20-260 KA/m low intensity magnetic separation is used to be separated iron ore.
The beneficial effect of the inventive method is:
1, the irreversible phenomena of rhombohedral iron ore susceptibility at intensification-temperature-fall period combines with magnetization technique of preparing by the present invention, thus achieves iron ore and magnetizing weak magnetite without the need to the roasting under additional reducing agent condition.
2, instant invention overcomes in actual industrial production and use weak magnetic raw ore to be heated to the technical problem that after 700 DEG C, the magnetic separation rate of recovery is lower, after being heated to 700 DEG C in actual industrial production, the magnetic separation rate of recovery is only 30% ~ 40%, and adopt the present invention without the beneficiation method of roasting magnetization weakly magnetic iron ore under additional reducing agent and anoxia condition, its rate of recovery significantly improves with the intensification of Heating temperature, under 900 DEG C of Heating temperatures, the rate of recovery can reach 75.7%, and the grade of magnetic separation magnetic product iron ore concentrate reaches 72.5%.
3, the present invention is compared with conventional reduction roasting method, due to without the need to additional any reductive agent, thus save the cost of reductive agent, decrease the noxious gas emissions such as carbonic acid gas simultaneously, not only energy-conservation but also environmental protection, its power consumption is only 50 percent of the power consumption of existing reducing roasting technology.
4, the present invention's stoving oven used does not need combustion chamber, and also without the need to considering the problem such as reduction and mineral grain center reduction deficiency, laid down cost is cheap, simple and convenient operation and maintenance, is convenient to realize suitability for industrialized production.
Embodiment
The inventive method step is as follows:
(1) roasting: by weak magnetite crushing raw ore mill, particle diameter: be less than 1mm, is then placed in the atmosphere stoving oven that can control nitrogen or argon gas and heats; without roasting 40-150 minute under any additional reducing agent condition; maturing temperature, at 750 ~ 900 DEG C, stops heating, naturally cooling under atmosphere protection.
(2) low intensity magnetic separation: the product that calcination atmosphere protection is cooled down; Iron grade is at 20-30%; be <200 order through regrinding to granularity, be carry out low intensity magnetic separation to the roasted ore after fine grinding under the condition of 20-260 KA/m to be selected by iron in magneticstrength, mine tailing is gangue.
Weak magnetic mineral raw ore Iron grade at 20-30%, is placed on and can controls, in nitrogen atmosphere pipe type calciner, to be evacuated to (-0.1x10 by embodiment 1.
5n/m
2), passing into atmosphere protection, sintering temperature at 700 DEG C, after product of roasting is finely ground to 200 orders, low intensity magnetic separation in the magnetic tube to fixed-field being 145KA/m, magnetic separation magnetic product is iron ore concentrate, its grade 32.5%, the rate of recovery 35.5%.
Weak magnetic mineral raw ore Iron grade at 20-30%, is placed on and can controls, in nitrogen atmosphere pipe type calciner, to be evacuated to (-0.1x10 by embodiment 2.
5n/m
2), passing into atmosphere protection, sintering temperature at 750 DEG C, after product of roasting is finely ground to 200 orders, low intensity magnetic separation in the magnetic tube to fixed-field being 145KA/m, magnetic separation magnetic product is iron ore concentrate, its grade 42.5%, the rate of recovery 45.5%.
Weak magnetic mineral raw ore Iron grade at 20-30%, is placed on and can controls, in nitrogen atmosphere pipe type calciner, to be evacuated to (-0.1x10 by embodiment 3.
5n/m
2), passing into atmosphere protection, sintering temperature at 800 DEG C, after product of roasting is finely ground to 200 orders, low intensity magnetic separation in the magnetic tube to fixed-field being 145KA/m, magnetic separation magnetic product is iron ore concentrate, its grade 52.5%, the rate of recovery 55.5%.
Weak magnetic mineral raw ore Iron grade at 20-30%, is placed on and can controls, in nitrogen atmosphere pipe type calciner, to be evacuated to (-0.1x10 by embodiment 4.
5n/m
2), passing into atmosphere protection, sintering temperature at 850 DEG C, after product of roasting is finely ground to 200 orders, low intensity magnetic separation in the magnetic tube to fixed-field being 145KA/m, magnetic separation magnetic product is iron ore concentrate, its grade 62.5%, the rate of recovery 65.5%.
Weak magnetic mineral raw ore Iron grade at 20-30%, is placed on and can controls, in nitrogen atmosphere pipe type calciner, to be evacuated to (-0.1x10 by embodiment 5.
5n/m
2), passing into atmosphere protection, sintering temperature at 900 DEG C, after product of roasting is finely ground to 200 orders, low intensity magnetic separation in the magnetic tube to fixed-field being 145KA/m, magnetic separation magnetic product is iron ore concentrate, its grade 72.5%, the rate of recovery 75.5%.
The grade of table 1. magnetic separation magnetic product iron ore concentrate under nitrogen atmosphere condition and the rate of recovery are with the change of maturing temperature
| Maturing temperature DEG C | Grade % | Rate of recovery % |
| 700 | 32.5 | 35.5 |
| 750 | 42.5 | 45.5 |
| 800 | 52.5 | 55.5 |
| 850 | 62.5 | 65.5 |
| 900 | 72.5 | 75.5 |
The difference of this embodiment of embodiment 6. and embodiment 1 is only that calcination atmosphere is argon gas, and magnetic separation magnetic product is iron ore concentrate, its grade 31.5%, the rate of recovery 34.5%.
The difference of this embodiment of embodiment 7. and embodiment 2 is only that calcination atmosphere is argon gas, and magnetic separation magnetic product is iron ore concentrate, its grade 41.5%, the rate of recovery 44.5%.
The difference of this embodiment of embodiment 8. and embodiment 3 is only that calcination atmosphere is argon gas, and magnetic separation magnetic product is iron ore concentrate, its grade 51.5%, the rate of recovery 54.5%.
The difference of this embodiment of embodiment 9. and embodiment 4 is only that calcination atmosphere is argon gas, and magnetic separation magnetic product is iron ore concentrate, its grade 61.5%, the rate of recovery 64.5%.
The difference of this embodiment of embodiment 10. and embodiment 5 is only that calcination atmosphere is argon gas, and magnetic separation magnetic product is iron ore concentrate, its grade 71.5%, the rate of recovery 74.5%.
Although describe the present invention in conjunction with specific embodiment, those skilled in the art will appreciate that and can make many amendments and modification to the present invention.Therefore, recognize, the intention of claims is to be encompassed in all such modifications in true spirit of the present invention and scope and modification.
Claims (10)
1., without a beneficiation method for roasting magnetization weakly magnetic iron ore under additional reducing agent, it is characterized in that, comprise the following steps:
(1) roasting: by weak magnetite crushing raw ore mill, particle diameter: be less than 1mm, is then placed in the atmosphere stoving oven that can control nitrogen or argon gas and heats, without roasting 40-150 minute under any additional reducing agent condition, maturing temperature, at 700 ~ 900 DEG C, stops heating, naturally cooling under atmosphere protection;
(2) low intensity magnetic separation: the product that calcination atmosphere protection is cooled down; Iron grade is at 20-30%; be <200 order through regrinding to granularity, be carry out low intensity magnetic separation to the roasted ore after fine grinding under the condition of 20-260 KA/m to be selected by iron in magneticstrength, mine tailing is gangue.
2. a kind of beneficiation method without roasting magnetization weakly magnetic iron ore under additional reducing agent as claimed in claim 1, is characterized in that, roasting is in an oxygen-free atmosphere without roasting magnetization weakly magnetic iron ore under additional reducing agent condition.
3. a kind of method without roasting magnetization weakly magnetic iron ore under additional reducing agent as claimed in claim 1, it is characterized in that, roasting uses weakly magnetic iron ore raw ore to comprise rhombohedral iron ore, limonite, kakoxene, specularite and pyrrhosiderite.
4. a kind of beneficiation method without roasting magnetization weakly magnetic iron ore under additional reducing agent as claimed in claim 1, it is characterized in that, roasting process all carries out in the stove of controlled atmosphere.
5. a kind of beneficiation method without roasting magnetization weakly magnetic iron ore under additional reducing agent as claimed in claim 1, it is characterized in that, baking heat mode comprises the outer combustion heating of electrically heated, Sweet natural gas or gas furnace and microwave heating.
6. a kind of beneficiation method without roasting magnetization weakly magnetic iron ore under additional reducing agent as claimed in claim 1, it is characterized in that, the oxygen-free atmosphere of roasting process comprises nitrogen atmosphere, inert gas atmosphere and carbon dioxide atmosphere.
7. a kind of beneficiation method without roasting magnetization weakly magnetic iron ore under additional reducing agent as claimed in claim 1, it is characterized in that, iron ore is separated with gangue by the weak magnetite low-intensity magnetic field under oxygen free condition after roasting magnetization.
8. a kind of beneficiation method without roasting magnetization weakly magnetic iron ore under additional reducing agent as claimed in claim 1, it is characterized in that, maturing temperature is 750 DEG C ~ 900 DEG C, and now the grade of magnetic separation magnetic product iron ore concentrate can reach more than 41.5%, the rate of recovery reaches more than 44.5%.
9. a kind of beneficiation method without roasting magnetization weakly magnetic iron ore under additional reducing agent as claimed in claim 8, it is characterized in that, maturing temperature is 800 DEG C ~ 900 DEG C, and now the grade of magnetic separation magnetic product iron ore concentrate can reach more than 51.5%, the rate of recovery reaches more than 54.5%.
10. a kind of beneficiation method without roasting magnetization weakly magnetic iron ore under additional reducing agent as claimed in claim 9, it is characterized in that, maturing temperature is 850 DEG C ~ 900 DEG C, and now the grade of magnetic separation magnetic product iron ore concentrate can reach more than 61.5%, the rate of recovery reaches more than 64.5%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104946882A (en) * | 2015-07-09 | 2015-09-30 | 内蒙古科技大学 | Method for converting limonite into magnetic iron mineral |
| CN105268540A (en) * | 2015-11-13 | 2016-01-27 | 河南理工大学 | Hematite beneficiation method |
| CN106119456A (en) * | 2016-08-01 | 2016-11-16 | 江苏省冶金设计院有限公司 | Prepare the method and system of ferrum |
| CN107326173A (en) * | 2017-07-13 | 2017-11-07 | 中南大学 | A kind of method of valuable metal in compound additive recovery copper ashes |
| CN108993770A (en) * | 2018-07-27 | 2018-12-14 | 湖南农业大学 | A kind of ore-dressing technique of fine grain teeth cloth silicate-type iron oxide ore |
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| CN103397176A (en) * | 2013-07-26 | 2013-11-20 | 辽宁博联特冶金科技有限公司 | Combined ore-dressing method of extracting iron and removing phosphorus from low-lean, high-phosphorous and refractory iron ore |
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2014
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| GB484757A (en) * | 1936-06-13 | 1938-05-10 | Metallgesellschaft Ag | Process for concentrating low-grade iron ores |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104946882A (en) * | 2015-07-09 | 2015-09-30 | 内蒙古科技大学 | Method for converting limonite into magnetic iron mineral |
| CN105268540A (en) * | 2015-11-13 | 2016-01-27 | 河南理工大学 | Hematite beneficiation method |
| CN106119456A (en) * | 2016-08-01 | 2016-11-16 | 江苏省冶金设计院有限公司 | Prepare the method and system of ferrum |
| CN107326173A (en) * | 2017-07-13 | 2017-11-07 | 中南大学 | A kind of method of valuable metal in compound additive recovery copper ashes |
| CN107326173B (en) * | 2017-07-13 | 2019-03-05 | 中南大学 | A kind of method of valuable metal in compound additive recovery copper ashes |
| CN108993770A (en) * | 2018-07-27 | 2018-12-14 | 湖南农业大学 | A kind of ore-dressing technique of fine grain teeth cloth silicate-type iron oxide ore |
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Application publication date: 20150603 |