CN105233972B - A kind of method for separating of Anshan type poor iron ore - Google Patents
A kind of method for separating of Anshan type poor iron ore Download PDFInfo
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- CN105233972B CN105233972B CN201510743081.9A CN201510743081A CN105233972B CN 105233972 B CN105233972 B CN 105233972B CN 201510743081 A CN201510743081 A CN 201510743081A CN 105233972 B CN105233972 B CN 105233972B
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- 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
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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Abstract
The invention belongs to Mineral Processing Engineering technical field, and in particular to a kind of method for separating of Anshan type poor iron ore.The present invention carries out selected and roughing, obtained selected concentrate is gravity concentrate, overflow to rougher tailings and thickness grading carries out low intensity magnetic separation and high intensity magnetic separation, reverse flotation roughing is carried out again to weak magnetic concentrate selection and high intensity magnetic separation concentrate, it is selected that the reverse flotation rougher concentration that reverse flotation roughing obtains carries out reverse flotation again, the selected concentrate of reverse flotation and gravity concentrate of gained are incorporated as total concentrate, and the Iron grade of total concentrate is 68 ~ 69%, and iron recovery is up to 83 ~ 86%.Of the invention low cost, iron mineral in Anshan type poor iron ore has been sorted high-recovery.
Description
Technical field
The invention belongs to Mineral Processing Engineering technical field, and in particular to a kind of method for separating of Anshan type poor iron ore.
Background technology
In the explored iron ore deposit in China, weak-magnetic iron ore accounts for 65% or so of iron ore total amount, wherein Anshan
The poor iron ore of formula accounts for more than half of weak magnetism ore resources, is one of main iron ore deposit in China.In Present Global steel industry
Under severe situation, the sorting for strengthening Anshan type poor iron ore utilizes, it appears particularly important.
Anshan type poor iron ore be mostly particulate contaminate high silicon poor iron ore, general iron content 30% or so, containing silica
40%~50%.Major metal mineral have magnetic iron ore, illusion（Or half illusion）Bloodstone, bloodstone, sometimes containing a small amount of limonite, mirror
Iron ore, siderite etc.；Gangue mineral is mainly quartz, is secondly the silicate minerals such as hornblend, biotite or pyroxene.
The outstanding feature of this kind of ore is shown：
（1）Iron mineral and the embedding cloth relation of gangue mineral are extremely close, and dip-dye granularity is thinner, need to typically be milled to -0.074mm and account for
More than 85% could monomer dissociation, some ores contaminated in microfine usually need to be milled to -0.054mm account for more than 85% could be single
Body dissociates.
（2）Ore is in belt structure more, and minority is compact massive.In ore layer, iron mineral accounts for 70% ~ 75%, quartz
Rock accounts for 25% ~ 30%；In interlayer between ore layer and ore layer, quartzite accounts for 80% ~ 85%, and iron mineral accounts for 15% ~ 20%.
（3）Due to being changed in mineral deposit during the thickness of ore layer and interlayer, the property of ore is caused often to fluctuate, in addition iron
The disseminated grain size thickness of mineral is uneven, and this also brings certain difficulty to the exploitation of such ore.
The maximally effective technological process of current sorting Anshan type poor iron ore be stage grinding and coarse and fine separation-gravity treatment-magnetic separation-
Anion reverse floatation technique, the flow achieve due to targetedly size fractionated iron mineral being separately recovered
Preferable separation index.But there is an obvious problem in the technique, i.e., relatively low due to sweeping middle magnetic magnetic field intensity, it is impossible to in pan feeding
The fine fraction iron mineral of monomer dissociation effectively reclaims, so that its too high levels in mine tailing, it is poor that this had both added Anshan type
The sorting cost of iron ore, causes the wasting of resources again.
The content of the invention
The problem of existing for prior art, the present invention provide a kind of method for separating of Anshan type poor iron ore, it is therefore an objective to
Overcome problem present in current process flows, low cost, sort iron mineral in Anshan type poor iron ore high-recovery.
Realize that the technical scheme of the object of the invention follows the steps below：
（1）Anshan type poor iron ore raw ore is sent into one section of closed circuit grinding system and carries out ore grinding, obtain granularity for-
0.074mm part accounts for the original ore powder of gross weight 55 ~ 65%；
（2）Original ore powder is sent into hydrocyclone and carries out thickness grading, underflow therein feeds in gravitational separation equipment and carried out
Roughing, roughing obtain rougher concentration, roughing chats and rougher tailings, will rougher concentration be sent into gravitational separation equipment in carry out again it is selected,
Selected to obtain selected concentrate, selected chats and cleaner tailings, selected concentrate therein is gravity concentrate, selected chats therein
It is selected again to return to cleaning technological flowasheet progress；
（3）By step（2）Described in roughing chats and cleaner tailings be sent into secondary grinding system in regrinded, obtain
Granularity is that -0.074mm part accounts for the ore grinding powder of gross weight 85 ~ 90%, and ore grinding powder is returned in hydrocyclone and carried out again slightly
Subfractionation；
（4）To step（2）The overflow of middle thickness grading and rougher tailings carry out low intensity magnetic separation, obtain weak magnetic concentrate selection and weak magnetic
Mine tailing is selected, low intensity magnetic separation mine tailing therein, which is once concentrated to give, once concentrates ore pulp, carries out high intensity magnetic separation to it, obtains high intensity magnetic separation
Concentrate and high intensity magnetic separation mine tailing；
（5）To step（4）In weak magnetic concentrate selection and high intensity magnetic separation concentrate carry out secondary concentration together, then carry out reverse flotation
Roughing, reverse flotation rougher concentration and reverse flotation rougher tailings are obtained, reverse flotation rougher tailings is scanned three times, each of which
The secondary concentrate for scanning to obtain all is returned in the flow of upper level, and obtained mine tailing carries out next stage and scanned, and final third time is swept
Select mine tailing, high intensity magnetic separation mine tailing and once concentrate overflow, secondary concentration overflow merge abandoned as true tailings, its grade be 8 ~
9%；It is selected that reverse flotation is carried out to described reverse flotation rougher concentration, obtains the selected concentrate of reverse flotation and reverse flotation cleaner tailings, its
Middle reverse flotation cleaner tailings is returned in reverse flotation roughing flow carries out reverse flotation roughing again, the selected concentrate of reverse flotation and gravity treatment
Concentrate is incorporated as total concentrate, and the Iron grade of total concentrate is 68 ~ 69%, and iron recovery is up to 83 ~ 86%.
Wherein, described low intensity magnetic separation magnetic field intensity is 1000 ~ 1500 Oe, described high intensity magnetic separation magnetic field intensity is 7000 ~
10000 Oe。
The described weight concentration for once concentrating ore pulp is 30 ~ 45%, and the weight concentration of secondary concentration ore pulp is 30 ~ 45%.
Compared with prior art, the features of the present invention and beneficial effect are：
（1）The method for separating of the Anshan type poor iron ore of the present invention eliminates the magnetic operation in scanning, and greatly reduces and sets
Standby fixed investment and operation cost；
（2）The fine fraction iron mineral of monomer dissociation is thrown into tail without the relatively low middle magnetic of scanning of magnetic field intensity in the present invention,
But directly feed magnetic separation, reverse flotation work, wherein high intensity magnetic separation due to magnetic field intensity it is high, can in pan feeding monomer dissociation it is thin
Grade iron mineral effectively reclaims, and so as to reduce its loss in mine tailing, improves recovery rate in ore-dressing；
（3）The present invention, which cancels, sweeps middle magnetic operation, and gravity treatment chats directly feeds Regrinding, makes a part of originally through sweeping middle magnetic
Throw the intergrowth particle removed and again pass by grinding dissociation, so as to increase reselection operation mine-supplying quantity, and improve the whole process rate of recovery, from
And reduce production cost；
（4）Gravity treatment and roughing operation of the present invention adds side tail product, and the overflow of itself and thickness grading cyclone is closed
And magnetic separation, reverse flotation work are fed, improve the rate of recovery.
Brief description of the drawings
Fig. 1 is the concrete technology flow process figure of the present invention.
Embodiment
With typical Anshan type poor iron ore in the embodiment of the present invention：Qidashan iron ore ore（TFe 32.43%）Come for example
Illustrate the application effect of the present invention, in order to prove the universality of the present invention, carry out the sorting examination of 3 kinds of different partition sizes respectively
Test.
Embodiment 1
The idiographic flow of the method for separating of the Anshan type poor iron ore of the present embodiment is as shown in figure 1, and according to following steps
Carry out：
（1）Qidashan iron ore ore raw ore is sent into one section of closed circuit grinding system, obtains the part that granularity is -0.074mm
Account for the original ore powder of gross weight 58.17%；
（2）Original ore powder is sent into hydrocyclone and carries out thickness grading, 36 μm of partition size, the overflow of hydrocyclone
Yield is 41.63%, and underflow therein feeds and roughing is carried out in spiral concentrator, and roughing obtains rougher concentration, roughing chats and thick
Select mine tailing, will rougher concentration be sent into spiral concentrator in carry out again it is selected, it is selected to obtain selected concentrate, selected chats and selected tail
Ore deposit, selected concentrate therein are gravity concentrate, and the yield of gravity concentrate is 21.64%, Iron grade 69.06%, iron recovery
For 46.38%, selected middling recurrence cleaning technological flowasheet therein carries out selected again；
（3）By step（2）Described in roughing chats and cleaner tailings be sent into secondary grinding system in regrinded, obtain
Granularity is that -0.074mm part accounts for the ore grinding powder of gross weight 88.56%, and ore grinding powder returns in hydrocyclone and carries out thickness again
Classification；
（4）To step（2）The overflow of middle thickness grading and rougher tailings carry out low intensity magnetic separation, and magnetic field intensity is 1000 Oe,
Obtain weak magnetic concentrate selection and low intensity magnetic separation mine tailing, low intensity magnetic separation mine tailing therein is once concentrated, turn into weight concentration be 30% one
Secondary concentration ore pulp, high intensity magnetic separation is carried out to it, the magnetic field intensity of high intensity magnetic separation is 7000 Oe, obtains high intensity magnetic separation concentrate and high intensity magnetic separation tail
Ore deposit；
（5）To step（4）In weak magnetic concentrate selection and high intensity magnetic separation concentrate carry out secondary concentration together, secondary concentration ore pulp
Weight concentration is 30%, then carries out reverse flotation roughing, reverse flotation rougher concentration and reverse flotation rougher tailings is obtained, to reverse flotation
Rougher tailings is scanned three times, and the concentrate that each of which time scans to obtain all is returned in the flow of upper level, obtained mine tailing
Carry out next stage to scan, final third time scans mine tailing, high intensity magnetic separation mine tailing and once concentrates overflow, secondary concentration overflow merging
Abandoned as true tailings, its grade is 8.89%；It is selected that reverse flotation is carried out to described reverse flotation rougher concentration, it is counter to be floated
Selected concentrate and reverse flotation cleaner tailings is selected, wherein reverse flotation cleaner tailings is returned in reverse flotation roughing flow and carried out again instead
The selected concentrate yield of roughing flotation, wherein reverse flotation is 17.87%, Iron grade 67.88, %, iron recovery 36.65%, reverse flotation essence
Ore deposit and gravity concentrate are incorporated as total concentrate, total concentrate yield 39.51%, Iron grade 68.53%, iron recovery 83.03%.
Embodiment 2
The idiographic flow of the method for separating of the Anshan type poor iron ore of the present embodiment is as shown in figure 1, and according to following steps
Carry out：
（1）Qidashan iron ore ore raw ore is sent into one section of closed circuit grinding system, obtains the part that granularity is -0.074mm
Account for the original ore powder of gross weight 58.17%；
（2）Original ore powder is sent into hydrocyclone and carries out thickness grading, 25 μm of partition size, the overflow of hydrocyclone
Yield is 33.61%, and underflow therein feeds and roughing is carried out in spiral concentrator, and roughing obtains rougher concentration, roughing chats and thick
Select mine tailing, will rougher concentration be sent into spiral concentrator in carry out again it is selected, it is selected to obtain selected concentrate, selected chats and selected tail
Ore deposit, selected concentrate therein are gravity concentrate, and the yield of gravity concentrate is 23.82%, Iron grade 69.28%, iron recovery
For 50.79%, selected middling recurrence cleaning technological flowasheet therein carries out selected again；
（3）By step（2）Described in roughing chats and cleaner tailings be sent into secondary grinding system in regrinded, obtain
Granularity is that -0.074mm part accounts for the ore grinding powder of gross weight 89.60%, and ore grinding powder returns in hydrocyclone and carries out thickness again
Classification；
（4）To step（2）The overflow of middle thickness grading and rougher tailings carry out low intensity magnetic separation, and magnetic field intensity is 1200 Oe,
Obtain weak magnetic concentrate selection and low intensity magnetic separation mine tailing, low intensity magnetic separation mine tailing therein is once concentrated, turn into weight concentration be 40% one
Secondary concentration ore pulp, high intensity magnetic separation is carried out to it, the magnetic field intensity of high intensity magnetic separation is 8000 Oe, obtains high intensity magnetic separation concentrate and high intensity magnetic separation tail
Ore deposit；
（5）To step（4）In weak magnetic concentrate selection and high intensity magnetic separation concentrate carry out secondary concentration together, secondary concentration ore pulp
Weight concentration is 40%, then carries out reverse flotation roughing, reverse flotation rougher concentration and reverse flotation rougher tailings is obtained, to reverse flotation
Rougher tailings is scanned three times, and the concentrate that each of which time scans to obtain all is returned in the flow of upper level, obtained mine tailing
Carry out next stage to scan, final third time scans mine tailing, high intensity magnetic separation mine tailing and once concentrates overflow, secondary concentration overflow merging
Abandoned as true tailings, its grade is 8.33%；It is selected that reverse flotation is carried out to described reverse flotation rougher concentration, it is counter to be floated
Selected concentrate and reverse flotation cleaner tailings is selected, wherein reverse flotation cleaner tailings is returned in reverse flotation roughing flow and carried out again instead
The selected concentrate yield of roughing flotation, wherein reverse flotation is 16.95%, and Iron grade 67.69%, iron recovery 34.65%, described is anti-
The selected concentrate of flotation and gravity concentrate are incorporated as total concentrate, total concentrate yield 40.78%, Iron grade 68.62%, iron recovery
85.44%。
Embodiment 3
The idiographic flow of the method for separating of the Anshan type poor iron ore of the present embodiment is as shown in figure 1, and according to following steps
Carry out：
（1）Qidashan iron ore ore raw ore is sent into one section of closed circuit grinding system, obtains the part that granularity is -0.074mm
Account for the original ore powder of gross weight 59.2%；
（2）Original ore powder is sent into hydrocyclone and carries out thickness grading, 20 μm of partition size, the overflow of hydrocyclone
Yield is 21.72%, and underflow therein feeds and roughing is carried out in spiral concentrator, and roughing obtains rougher concentration, roughing chats and thick
Select mine tailing, will rougher concentration be sent into spiral concentrator in carry out again it is selected, it is selected to obtain selected concentrate, selected chats and selected tail
Ore deposit, selected concentrate therein are gravity concentrate, and the yield of gravity concentrate is 28.68%, Iron grade 67.02%, iron recovery
For 60.56%, selected middling recurrence cleaning technological flowasheet therein carries out selected again；
（3）By step（2）Described in roughing chats and cleaner tailings be sent into secondary grinding system in regrinded, obtain
Granularity is that -0.074mm part accounts for the ore grinding powder of gross weight 85.43%, and ore grinding powder returns in hydrocyclone and carries out thickness again
Classification；
（4）To step（2）The overflow of middle thickness grading and rougher tailings carry out low intensity magnetic separation, and magnetic field intensity is 1500 Oe,
Obtain weak magnetic concentrate selection and low intensity magnetic separation mine tailing, low intensity magnetic separation mine tailing therein is once concentrated, turn into weight concentration be 45% one
Secondary concentration ore pulp, high intensity magnetic separation is carried out to it, the magnetic field intensity of high intensity magnetic separation is 1000 Oe, obtains high intensity magnetic separation concentrate and high intensity magnetic separation tail
Ore deposit；
（5）To step（4）In weak magnetic concentrate selection and high intensity magnetic separation concentrate carry out secondary concentration together, secondary concentration ore pulp
Weight concentration is 45%, then carries out reverse flotation roughing, reverse flotation rougher concentration and reverse flotation rougher tailings is obtained, to reverse flotation
Rougher tailings is scanned three times, and the concentrate that each of which time scans to obtain all is returned in the flow of upper level, obtained mine tailing
Carry out next stage to scan, final third time scans mine tailing, high intensity magnetic separation mine tailing and once concentrates overflow, secondary concentration overflow merging
Abandoned as true tailings, its grade is 8.02%；It is selected that reverse flotation is carried out to described reverse flotation rougher concentration, it is counter to be floated
Selected concentrate and reverse flotation cleaner tailings is selected, wherein reverse flotation cleaner tailings is returned in reverse flotation roughing flow and carried out again instead
The selected concentrate yield of roughing flotation, wherein reverse flotation is 12.14%, and Iron grade 68.07%, iron recovery 24.37%, described is anti-
The selected concentrate of flotation and gravity concentrate are incorporated as total concentrate, total concentrate yield 40.82%, Iron grade 68.00%, iron recovery
84.93%。
Claims (1)
1. a kind of method for separating of Anshan type poor iron ore, is followed the steps below:
(1) Anshan type poor iron ore raw ore is sent into one section of closed circuit grinding system and carries out ore grinding, it is -0.074mm's to obtain granularity
Part accounts for the original ore powder of gross weight 55 ~ 65%；
(2) original ore powder to be sent into hydrocyclone and carries out thickness grading, underflow therein, which is fed, carries out roughing in gravitational separation equipment,
Roughing obtains rougher concentration, roughing chats and rougher tailings, rougher concentration is sent into gravitational separation equipment carry out again it is selected, it is selected
To selected concentrate, selected chats and cleaner tailings, selected concentrate therein is gravity concentrate, selected middling recurrence essence therein
Flow is selected to carry out selected again；
It is characterized in that：
(3) the roughing chats described in step (2) and cleaner tailings are sent into secondary grinding system and regrinded, obtain grain
The part spent for -0.074mm accounts for the ore grinding powder of gross weight 85 ~ 90%, and ore grinding powder returns in hydrocyclone and carries out thickness again
Classification；
(4) overflow to thickness grading in step (2) and rougher tailings carry out low intensity magnetic separation, obtain weak magnetic concentrate selection and low intensity magnetic separation tail
Ore deposit, low intensity magnetic separation mine tailing therein, which is once concentrated to give, once concentrates ore pulp, and high intensity magnetic separation is carried out to it, obtains high intensity magnetic separation essence
Ore deposit and high intensity magnetic separation mine tailing；
(5) secondary concentration is carried out together to the weak magnetic concentrate selection in step (4) and high intensity magnetic separation concentrate, it is thick then carries out reverse flotation
Choosing, obtains reverse flotation rougher concentration and reverse flotation rougher tailings, secondary to the progress of reverse flotation rougher tailings to scan, each of which time
The concentrate for scanning to obtain all is returned in the flow of upper level, and obtained mine tailing carries out next stage and scanned, and final scans for the second time
Mine tailing, high intensity magnetic separation mine tailing and once concentrate overflow, secondary concentration overflow merge abandoned as true tailings, its grade be 8 ~ 9%；
It is selected that reverse flotation is carried out to described reverse flotation rougher concentration, obtains the selected concentrate of reverse flotation and reverse flotation cleaner tailings, wherein
Reverse flotation cleaner tailings is returned in reverse flotation roughing flow carries out reverse flotation roughing again, the selected concentrate of reverse flotation and gravity treatment essence
Ore deposit is incorporated as total concentrate, and the Iron grade of total concentrate is 68 ~ 69%, and iron recovery is up to 83 ~ 86%；Described low intensity magnetic separation magnetic field is strong
It is 7000 ~ 10000 Oe to spend for 1000 ~ 1500Oe, described high intensity magnetic separation magnetic field intensity；The described weight for once concentrating ore pulp
Concentration is 30 ~ 45%, and the weight concentration of secondary concentration ore pulp is 30 ~ 45%.
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| CN109939818A (en) * | 2019-03-29 | 2019-06-28 | 阿勒泰正元国际矿业有限公司 | A kind of beneficiation method that tailing is regrinded and device |
| CA3144756A1 (en) * | 2019-07-03 | 2021-01-07 | Fortescue Metals Group Ltd | Method for the beneficiation of iron ore streams |
| CN111013811A (en) * | 2019-12-23 | 2020-04-17 | 鞍钢集团矿业有限公司 | Thickness separation-gravity-magnetic combined mineral separation process for treating Anshan type iron ore |
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| CN113042195A (en) * | 2021-03-19 | 2021-06-29 | 鞍钢集团北京研究院有限公司 | Ore dressing process of hematite through coarse-fine classification-gravity-magnetic-reverse flotation |
| CN113042194A (en) * | 2021-03-19 | 2021-06-29 | 鞍钢集团北京研究院有限公司 | Mineral separation process for hematite |
| CN113953080B (en) * | 2021-09-01 | 2024-04-19 | 鞍钢集团北京研究院有限公司 | Mineral separation method of mixed iron ore |
| CN115090534A (en) * | 2022-07-15 | 2022-09-23 | 中钢集团马鞍山矿山研究总院股份有限公司 | Beneficiation method for recovering low-grade manganese ore from flotation tailings |
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