CN104148175B - Mineral processing technology for siderite-magnetite mixed ore - Google Patents

Mineral processing technology for siderite-magnetite mixed ore Download PDF

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CN104148175B
CN104148175B CN201410388543.5A CN201410388543A CN104148175B CN 104148175 B CN104148175 B CN 104148175B CN 201410388543 A CN201410388543 A CN 201410388543A CN 104148175 B CN104148175 B CN 104148175B
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ore
magnetic
concentrate
grinding
iron
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CN104148175A (en
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刘宝山
李健民
郭海宁
刘涛
巩明辉
苗梁
彭建成
刘斯佳
李国栋
郭艳华
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Northwest Research Institute of Mining and Metallurgy
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Abstract

The invention provides a mineral processing technology for siderite-magnetite mixed ore. The mineral processing technology mainly comprises the followings process steps: a) the crushed siderite-magnetite mixed raw ore is fed into a primary grinding closed loop system for circular grinding and classification, and the obtained overflowing material is subjected to strong magnetic separation, so that strong magnetic concentrate with the iron grade greater than 40% is obtained; b) the strong magnetic concentrate is fed into a secondary grinding closed loop system for circular grinding and classification, and the obtained overflowing material is subjected to reverse flotation desulfuration, so that the desulfurated concentrate and desulfurated tailings are obtained; c) two-stage low intensity magnetic separation is performed on the desulfurated tailings, so as to form final iron ore concentrate I with the iron grade more than 62% and two-stage weak-magnetic tailings; d) the one-stage weak-magnetic tailings and the two-stage weak-magnetic tailings are mixed and then the mixture is fed into a table concentrator for mineral processing, so that table concentrator middling and table concentrator concentrate with the iron grade greater than 45% are obtained, the table concentrator middling is fed into a secondary grinding machine for processing again; the table concentrator concentrate is roasted directly, so that the roasted ore with the grade greater than 58% is obtained and used as final iron ore concentrate II.

Description

A kind of process Pedicellus et Pericarpium Trapae, the ore-dressing technique of magnetic mixed ore
Technical field
The invention belongs to iron ore sorts technical field, it is related to a kind of process Pedicellus et Pericarpium Trapae, the ore-dressing technique of magnetic mixed ore.
Background technology
With national society's expanding economy, what capital construction put into is continuously increased, and steel consumption is very huge.Every year The iron ore of China's import flood tide, to make up domestic Steel demand shortage, constantly rises recently as imported Fe ore price, The domestic existing iron ore of rational and efficient use has very real and important meaning to China's steel and iron industry.
Pedicellus et Pericarpium Trapae, magnetic mixed ore are a kind of domestic common iron ore types, and its ore properties changes greatly because of place of production difference. A kind of Pedicellus et Pericarpium Trapae originating from NORTHWEST CHINA area, magnetic mixed ore, the full Iron grade of its raw ore is relatively low, and only about 30.00%, wherein Pedicellus et Pericarpium Trapae Iron mine content is more, accounts for about the 50% of all iron content, next to that magnetic iron ore, accounts for about the 40% of all iron content, contains a small amount of sulfur simultaneously Iron mine, bloodstone, limonite and ferrosilite, objectionable impurities phosphorus content is less, but sulfur-bearing 2% about, gangue mineral is mainly quartzy And calcite.Process such Pedicellus et Pericarpium Trapae, magnetic mixed ore and typically adopt whole ore roasting-stage(Or it is continuous)Ore grinding-strong magnetic-weak magnetic-floating Select technological process(Or ore grinding-magnetic, weight, floating joint process).But by studying to this ore properties, magnetic iron ore in this Ore Disseminated grain size thickness is uneven, and typically between 1~60 micron, and the disseminated grain size of siderite is then relatively thick, typically 50 Between~300 microns, and containing a small amount of troilite.The Experimental study on ore dressing of this mixed ore is shown, this Ore adopts raw ore Roasting-stage(Or it is continuous)Ore grinding-weight, magnetic, floating joint process, after whole ore roasting, property changes, a part of ferromagnetism ore deposit Thing be in disseminated preservation it is difficult to effective dissociate, using magnetic method, iron concentrate grade is extremely difficult to require, and iron ore concentrate is counter floats Select desulfurization difficult.And in the case of raw ore not roasting, siderite is difficult to improve using Floatation Concentrate Grade.
Content of the invention
It is an object of the invention to provide a kind of process Pedicellus et Pericarpium Trapae, the ore-dressing technique of magnetic mixed ore, this technique can effectively solve Determined Pedicellus et Pericarpium Trapae, magnetic iron ore, siderite disseminated grain size difference are larger, containing compared with high sulfide pyrite, calcite, sparring in Ore in magnetic composite ore Ore deposit is unable to the problem of efficient recovery using floatation, can obtain the qualified iron ore concentrate of grade.
For this reason, the present invention adopts the following technical scheme that:
A kind of process Pedicellus et Pericarpium Trapae, the ore-dressing technique of magnetic mixed ore, comprise the technical steps that:
a)Will broken after Pedicellus et Pericarpium Trapae, magnetic mixed ore raw ore, feed and be made up of one section of grinding machine and one section of classifying cyclone group Primary grinding closed-circuit system is circulated ore grinding and classification, and specifically, after one section of grinding machine ore grinding, Ore enters one section of classification rotation Stream device group is formed hierarchically overflow material and the sand setting material that -200 mesh account for 60 ~ 70%, sand setting return to one section of grinding machine continue ore grinding and Classification, so constantly circulates and the satisfactory overflow material of output, and the overflow material that one section of classifying cyclone group is discharged is entered Row high-intensity magnetic separation, Iron grade of dishing out is less than 12.00% strong magnetic tail ore deposit and as true tailings, obtains Iron grade and is more than 40% High intensity magnetic mineral;
b)High intensity magnetic mineral is fed to be entered by the secondary grinding closed-circuit system that two-stage nitration classifying cyclone group and Secondary grinding mill are constituted Row circulation classification and ore grinding, specifically, first be formed hierarchically -325 mesh through two-stage nitration classifying cyclone group accounts for 80% ~ 90% to high intensity magnetic mineral Overflow material and sand setting material, sand setting feeds Secondary grinding mill ore grinding, and after ore grinding, Ore returns to two-stage nitration classifying cyclone group and continues It is classified and ore grinding, so constantly circulated and the satisfactory overflow material of output, the overflow that two-stage nitration cyclone group is discharged Material carries out reverse flotation desulfurizing, obtains the desulfurization mine tailing that desulfurization concentrate and sulfur grade are less than 0.30%;
c)Using desulfurization concentrate as true tailings, desulfurization mine tailing is carried out two sections of weak magnetics and sorts, one section of weak magnetic sorts rear shape Become one section of inferior fine magnetite concentrate and one section of weakly magnetic tailings;One section of inferior fine magnetite concentrate is fed two-stage nitration weak magnetic sort, form Iron grade and reach 62% Above final iron ore concentrate one and two-stage nitration weakly magnetic tailingses;
d)One section of weakly magnetic tailings and the merging of two-stage nitration weakly magnetic tailingses are fed shaking table and carry out ore dressing, Iron grade of dishing out is less than 20% Shaking table mine tailing, obtain the table concentrate that shaking table chats and Iron grade are more than 45%, shaking table chats feeds Secondary grinding mill and located Reason;Table concentrate, through roasting direct, obtains the roasted ore of grade more than 58% and as final iron ore concentrate two, shaking table mine tailing is made For true tailings.
Further, step(a)In, the magnetic field intensity of high intensity magnetic separation is 3500 ~ 5000 Oe.
Further, step(c)In, the magnetic field intensity of one section of low intensity magnetic separation is 1500 ~ 2500 Oe.
Further, step(c)In, the magnetic field intensity of two-stage nitration low intensity magnetic separation is 800 ~ 1000 Oe.
Further, step(d)In, the roasting condition of roasting direct is:600 ~ 750 DEG C of sintering temperature, roasting time 15 ~ 45min.
Using stage grinding, roughly grind-strong magnetic-regrinding process, one section of corase grind raw ore is fed high-intensity magnetic separation, due to magnetic iron ore Disseminated grain size is thinner, and after one section of corase grind, siderite and magnetic iron ore do not dissociate, can be effectively enriched with by high intensity magnetic separation with siderite and Iron mineral based on magnetic iron ore, two-stage nitration is regrinded and then desulfurization, decreases ore deposit amount of regrinding, has saved ore grinding energy consumption, and achieved morning Receive early throwing, it is to avoid strong magnetic tail ore deposit enters reverse flotation desulfurizing operation, had both saved floating agent, and had reduced floating agent environment again Pollution problem, reduces beneficiation cost.
Magnetic separation and table concentration organically combine, economic and environment-friendly energy-conservation, have both utilized single magnetic separation efficient recovery ferromagnetism magnetic Iron mine, is allowed to, as iron ore concentrate one, use the gravity table efficiently concentrating siderite of weak magnetic again, solve Pedicellus et Pericarpium Trapae, magnetic composite ore Middle siderite using traditional floatation can not effective enrichment problem, the table concentrate based on siderite through roasting direct, The qualified iron ore concentrate of output grade, as iron ore concentrate two, thus combining ore properties, the iron ore concentrate of the different grade of two kinds of output, Improve Pedicellus et Pericarpium Trapae, the economic benefit of magnetic composite ore, maximum has played Pedicellus et Pericarpium Trapae, the resources advantage of magnetic composite ore.
In addition, gravity table sorts the weakly magnetic tailingses based on siderite, it is to avoid cause to use in a large number using reverse flotation Floating agent and the problem of environmental pollution thus bringing, economic and environment-friendly energy-conservation.
To sum up, the beneficial effects of the present invention is:Achieve the effective ore dressing to Pedicellus et Pericarpium Trapae, magnetic composite ore to reclaim, and can obtain The qualified iron ore concentrate of grade;By the way of circulation ore grinding and classification, effectively reduce ore grinding energy consumption;First carry out high intensity magnetic separation to enter again Row reverse flotation desulfurizing, it is to avoid strong magnetic tail ore deposit enters reverse flotation desulfurizing operation, had both saved floating agent, reduces flotation medicine again Agent problem of environmental pollution, reduces beneficiation cost.
Brief description
Fig. 1 is the process chart of the present invention.
Specific embodiment
Pedicellus et Pericarpium Trapae, magnetic mixed ore handled by following embodiments, the full Iron grade of its raw ore is 30.72%, and wherein siderite accounts for full ferrum The 49.50% of content, magnetic iron ore accounts for the 39.28% of all iron content, contains a small amount of troilite, bloodstone, limonite and silicic acid simultaneously Ferrum, sulfur-bearing 1.86%, gangue mineral is mainly quartz and calcite.
Embodiment 1
A kind of process Pedicellus et Pericarpium Trapae, the ore-dressing technique of magnetic mixed ore, comprise the technical steps that:
a)Will broken after Pedicellus et Pericarpium Trapae, magnetic mixed ore raw ore, feed and be made up of one section of grinding machine and one section of classifying cyclone group Primary grinding closed-circuit system is circulated ore grinding and classification, and specifically, after one section of grinding machine ore grinding, Ore enters one section of classification rotation Stream device group is formed hierarchically overflow material and the sand setting material that -200 mesh account for 60 ~ 70%, sand setting return to one section of grinding machine continue ore grinding and Classification, so constantly circulates and the satisfactory overflow material of output, and the overflow material that one section of classifying cyclone group is discharged is entered Row high-intensity magnetic separation, the magnetic field intensity of high intensity magnetic separation is 4000 Oe, and Iron grade of dishing out is 11.23% strong magnetic tail ore deposit as Finality ore deposit, obtains Iron grade and is more than 42.50% high intensity magnetic mineral;
b)High intensity magnetic mineral is fed to be entered by the secondary grinding closed-circuit system that two-stage nitration classifying cyclone group and Secondary grinding mill are constituted Row circulation classification and ore grinding, specifically, first be formed hierarchically -325 mesh through two-stage nitration classifying cyclone group accounts for 80% ~ 90% to high intensity magnetic mineral Overflow material and sand setting material, sand setting feeds Secondary grinding mill ore grinding, and after ore grinding, Ore returns to two-stage nitration classifying cyclone group and continues It is classified and ore grinding, so constantly circulated and the satisfactory overflow material of output, the overflow that two-stage nitration cyclone group is discharged Material carries out reverse flotation desulfurizing, obtains the desulfurization mine tailing that desulfurization concentrate and sulfur grade are less than 0.30%;
c)Using desulfurization concentrate as true tailings, desulfurization mine tailing is carried out two sections of weak magnetics and sorts, wherein, one section of low intensity magnetic separation Magnetic field intensity is 1500 Oe, and the magnetic field intensity of two-stage nitration low intensity magnetic separation is 1000 Oe, and one section of weak magnetic forms one section of weak magnetic essence after sorting Ore deposit and one section of weakly magnetic tailings;One section of inferior fine magnetite concentrate is fed two-stage nitration weak magnetic sort, obtain the final Haematite that Iron grade is 62.01% Ore deposit one and two-stage nitration weakly magnetic tailingses;
d)One section of weakly magnetic tailings and the merging of two-stage nitration weakly magnetic tailingses are fed shaking table and carry out ore dressing, Iron grade of dishing out is 19.25% Shaking table mine tailing, obtain the table concentrate of Iron grade 47%, shaking table chats feeds Secondary grinding mill and processed;Table concentrate warp Cross roasting direct, obtain the roasted ore of grade 58.14% and as final iron ore concentrate two, shaking table mine tailing is as true tailings;Directly The roasting condition of roasting is:700 ~ 750 DEG C of sintering temperature, roasting time 15min.
Embodiment 2
Embodiment 2 is with the difference of embodiment 1:
Step a)In, the magnetic field intensity of high intensity magnetic separation is 3500 Oe, and the Iron grade of the strong magnetic tail ore deposit dished out is 11.64%, obtains The Iron grade of the high intensity magnetic mineral arriving is 41.87%;
Step c)In, the magnetic field intensity of one section of low intensity magnetic separation is 2500 Oe, and the magnetic field intensity of two-stage nitration low intensity magnetic separation is 800 Oe, The Iron grade of the final iron ore concentrate one obtaining is 63.22%;
Step d)In, the Iron grade of the shaking table mine tailing dished out after table concentration is 18.55%, the ferrum of the table concentrate obtaining Grade is 47.66%;The roasting condition of roasting direct is:600 ~ 650 DEG C of sintering temperature, roasting time 45min;Obtain is final The Iron grade of iron ore concentrate two is 58.21%.
Embodiment 3
Embodiment 3 is with the difference of embodiment 1:
Step a)In, the magnetic field intensity of high intensity magnetic separation is 5000 Oe, and the Iron grade of the strong magnetic tail ore deposit dished out is 9.89%, obtains High intensity magnetic mineral Iron grade be 41.90%;
Step c)In, the magnetic field intensity of one section of low intensity magnetic separation is 2000 Oe, and the magnetic field intensity of two-stage nitration low intensity magnetic separation is 900 Oe, The Iron grade of the final iron ore concentrate one obtaining is 62.71%;
Step d)In, the Iron grade of the shaking table mine tailing dished out after table concentration is 19.03%, the ferrum of the table concentrate obtaining Grade is 48.06%;The roasting condition of roasting direct is:650 ~ 700 DEG C of sintering temperature, roasting time 30min;Obtain is final The Iron grade of iron ore concentrate two is 58.45%.

Claims (5)

1. a kind of process Pedicellus et Pericarpium Trapae, the ore-dressing technique of magnetic mixed ore are it is characterised in that comprise the technical steps that:
a)Will broken after Pedicellus et Pericarpium Trapae, magnetic mixed ore raw ore, feed a section being made up of one section of grinding machine and one section of classifying cyclone group Ore grinding closed-circuit system is circulated ore grinding and classification, and specifically, after one section of grinding machine ore grinding, Ore enters one section of classifying cyclone Group is formed hierarchically overflow material and the sand setting material that -200 mesh account for 60 ~ 70%, and sand setting returns to one section of grinding machine to be continued ore grinding and divide Level, so constantly circulates and the satisfactory overflow material of output, and the overflow material that one section of classifying cyclone group is discharged is carried out High-intensity magnetic separation, Iron grade of dishing out is less than 12.00% strong magnetic tail ore deposit and as true tailings, obtains Iron grade and is more than the last 40% Magnetic concentrate;
b)High intensity magnetic mineral is fed and is followed by the secondary grinding closed-circuit system that two-stage nitration classifying cyclone group and Secondary grinding mill are constituted Ring classification and ore grinding, specifically, high intensity magnetic mineral is first formed hierarchically, through two-stage nitration classifying cyclone group, the overflow that -325 mesh account for 80% ~ 90% Material and sand setting material, sand setting feeds Secondary grinding mill ore grinding, and after ore grinding, Ore returns to two-stage nitration classifying cyclone group and proceeds Classification and ore grinding, so constantly circulate and the satisfactory overflow material of output, the overflow that two-stage nitration classifying cyclone group is discharged Material carries out reverse flotation desulfurizing, obtains the desulfurization mine tailing that desulfurization concentrate and sulfur grade are less than 0.30%;
c)Using desulfurization concentrate as true tailings, desulfurization mine tailing is carried out two sections of weak magnetics and sorts, one section of weak magnetic forms one after sorting Section inferior fine magnetite concentrate and one section of weakly magnetic tailings;One section of inferior fine magnetite concentrate is fed two-stage nitration weak magnetic sort, form Iron grade and reach more than 62% Final iron ore concentrate one and two-stage nitration weakly magnetic tailingses;
d)One section of weakly magnetic tailings and the merging of two-stage nitration weakly magnetic tailingses are fed shaking table and carry out ore dressing, Iron grade of dishing out shaking less than 20% Tailstock ore deposit, obtains the table concentrate that shaking table chats and Iron grade are more than 45%, and shaking table chats feeds Secondary grinding mill and processed; Table concentrate, through roasting direct, obtains the roasted ore of Iron grade more than 58% and as final iron ore concentrate two, shaking table mine tailing conduct True tailings.
2. a kind of ore-dressing technique processing Pedicellus et Pericarpium Trapae, magnetic mixed ore according to claim 1 is it is characterised in that step(a) In, the magnetic field intensity of high intensity magnetic separation is 3500 ~ 5000 Oe.
3. a kind of ore-dressing technique processing Pedicellus et Pericarpium Trapae, magnetic mixed ore according to claim 1 is it is characterised in that step(c) In, the magnetic field intensity of one section of low intensity magnetic separation is 1500 ~ 2500 Oe.
4. a kind of ore-dressing technique processing Pedicellus et Pericarpium Trapae, magnetic mixed ore according to claim 1 is it is characterised in that step(c) In, the magnetic field intensity of two-stage nitration low intensity magnetic separation is 800 ~ 1000 Oe.
5. a kind of ore-dressing technique processing Pedicellus et Pericarpium Trapae, magnetic mixed ore according to claim 1 is it is characterised in that step(d) In, the roasting condition of roasting direct is:600 ~ 750 DEG C of sintering temperature, roasting time 15 ~ 45min.
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CN105597925A (en) * 2015-12-30 2016-05-25 贵州省大方润丰化工有限公司 Magnetic separation method of pyrite roasting slag
CN107365905B (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 refractory iron ore closed circuit shower furnace roasting dry grinding dry separation craft online
CN108405179A (en) * 2018-03-07 2018-08-17 鞍钢集团矿业有限公司 A kind of method of magnetic separation-roasting-magnetic separation process recycling magnetic tailing

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CN102513203B (en) * 2011-12-12 2014-04-02 昆明理工大学 Method for recycling high-phosphorus/sulfur siderite resource
CN102553707A (en) * 2012-03-17 2012-07-11 鞍钢集团矿业公司 Process for separating lean-magnetite fine ore
CN102909124B (en) * 2012-10-26 2014-07-30 玉溪大红山矿业有限公司 Iron-increasing and silicon-reducing reselection technique for mixed-type lean iron ore tailings
CN103894283B (en) * 2014-04-04 2016-04-13 昆明理工大学 A kind of ore-dressing technique of iron content height silicate-type iron ore

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