CN102319621B - Method for raising grade of hematite by biologically reducing and magnetizing and dressing - Google Patents

Method for raising grade of hematite by biologically reducing and magnetizing and dressing Download PDF

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CN102319621B
CN102319621B CN201110171154.3A CN201110171154A CN102319621B CN 102319621 B CN102319621 B CN 102319621B CN 201110171154 A CN201110171154 A CN 201110171154A CN 102319621 B CN102319621 B CN 102319621B
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magnetization
hematite
bloodstone
magnetic
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冯雅丽
李浩然
杨志超
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University of Science and Technology Beijing USTB
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Abstract

The invention belongs to the field of dressing of black metals, and relates to a method for raising the grade of complex hematite which is difficult for dressing by reducing and magnetizing with microorganisms and dressing. A major process comprises ore grinding, forced magnetic dressing, reducing and magnetizing with microorganisms, and the like. The method is characterized by comprising the following steps of: feeding hematite of which the granularity is 0-4 millimeters into an ore mill for milling till hematite of -200 meshes accounts for 50-65 percent of all hematite; grading a ground ore sample with a high-gradient high intensity magnetic separator; feeding selected ore concentrate into the ore mill for milling to ore of less than -200 meshes; reducing and magnetizing with microorganisms by taking organic waste water as a culture medium; and selecting final ore concentration by performing high intensity magnetic separation, wherein the iron grade can be up to 55-70 percent, the recovery rate is over 70 percent, and the COD (Chemical Oxygen Demand) of the organic waste water is lowered remarkably. According to the method, complex hematite which is difficult for dressing can be fully recycled, and the product grade and the recovery rate are remarkably increased in comparison to those in the conventional high intensity magnetic separation process; and moreover, the energy consumption is low, and the method is environmentally-friendly.

Description

A kind of method that bloodstone biological reducing magnetizes and ore dressing is upgrade
Technical field
The present invention be more particularly directed to a kind of method that complicated refractory hematite is upgrade through biological reducing magnetization and ore dressing, belong to technical field of mineral processing.
Background technology
The fast development of China in Recent Years steel industry has driven the thriving demand of iron ore.China's iron ore deposit is abundant, but more than 97% is to be difficult to the directly lean ore of utilization, and exploitation difficulty is larger.The identified iron ore deposit of China is from natural abundance, and average grade only has 31-32%, still has the hematite of tens billion of tons or slag because disseminated grain size is thin, and complicated difficult is processed, and its potential economic worth reaches 1,000,000,000,000 dollars.
For difficulty, utilize iron ore to develop a collection of effective technology at present, as technology such as shaft furnace reducing hematite lump ore, rotary kiln magnetizing roast siderite and bloodstone, suspension fluidisation magnetizing roast bloodstone, adopt strong magnetic-flotation combined flow process that the bloodstone in some mines is sorted and reached iron concentrate grade.These technology energy consumptions are high or flow process is complicated.At nature, magnetic iron ore and bloodstone can transform mutually, and microorganism is playing the part of key player in the mutual conversion process of iron ore.Therefore urgently develop a kind of existing technical equipment of utilizing, hematite is carried out to Biological Pretreatment reduction magnetization bloodstone, then the new technology of carrying out traditional ore dressing, the iron mineral resources such as rational exploitation and utilization bloodstone and metallurgical slag.
Summary of the invention
The problems such as the object of the invention is to solve prior art, to process the energy consumption that low grade hematite exists large, and the low and environmental pollution of index is serious.
Technology that complicated refractory hematite biological reducing magnetizes and ore dressing is upgrade, step is as follows:
(1) bloodstone that granularity is less than to 4mm is milled to fineness through ore mill and accounts for 50%～65% for-200 orders, for high intensity magnetic separation;
(2) sample ore intensity magnetic separator magnetic separation step (1) being obtained;
(3) get step (2) magnetic concentrate and be milled to fineness for-200 orders～-325 order through ore mill, for going back
Former magnetization;
(4) select logarithmic phase alienation also pathogenic microorganism Rhodoferax ferrireducens (R.f), Geobacter sulfurreducens (G.s) and Shewanella oneidensis or anaerobic sludge, add sewage culture medium to form reduction magnetization liquid;
(5) by reduction magnetization 10～20d in step for magnetic concentrate (4) the gained reduction magnetization liquid obtaining in step (3);
(6) reduction concentrate step (5) being obtained again high intensity magnetic separation obtains final concentrate.
Further, in described step (2), for step (2) high intensity magnetic separation background lectromagnetism field, be 0.8T～1.2T.
Further, in described step (4), bacterium liquid and culture medium ratio are 1/4 ~ 3/7; After regulating reduction magnetization liquid pH to be 5.0～8.0, whole process is detested foster.
Further, in described step (5), roughly selecting concentrate addition is 1/9～3/7 with reduction magnetization solid and liquid ratio, and reduction magnetization process needs normal-temperature reaction 1～2d.
Further, in described step (6), magnetic separation background lectromagnetism field is 0.5T～1.0T.
Compare with the treatment process of existing bloodstone, the present invention is applicable to the bloodstone that granularity is less than the complicated difficult choosing of 4mm, and technique of the present invention is simple, and flow process is short, environmental protection, and cost is low.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
The specific embodiment
In the present invention, alienation also pathogenic microorganism Rhodoferax ferrireducens (R.f), Geobacter sulfurreducens (G.s) and Shewanella oneidensis is all purchased from German microorganism fungus kind preservation center (DSMZ).
Geobacter sulfurreducens: DSM No. 7210 collection No. ATCC53774
Rhodoferax ferrireducens: DSM No. 15236 collection No. ATCC BAA-621
Shewanella oneidensis: Type strain ATCC700550,MR-1
Embodiment 1: its main chemical compositions of certain bloodstone is: TFe 28.82, and P 0.35, and S 0.028, and C 0.96, SiO 248.64, Al 2o 36.08, CaO 3.64, and MgO 0.84, Na 2o 0.24, K 2o, 0.27.Mineral composition: metalliferous mineral is mainly bloodstone, is secondly limonite and siderite, and other metalliferous mineral content is extremely low; Gangue mineral is mainly the apatite of quartz, clay mineral, muscovite, dolomite and trace.
take the sample ore 100g of be crushed to-2mm, with levigate-200 orders of four rod mills of three rollers, account for 55%, preliminary election in the intensity magnetic separator that is then 1T by levigate sample ore in magnetic field intensity, magnetic mineral enters high intensity magnetic mineral, and non magnetic ore enters mine tailing, throws in advance except mine tailing;
high intensity magnetic mineral again enters to be milled to-325 orders and accounts for 75% rear filtration;
Figure 2011101711543100002DEST_PATH_IMAGE003
the phase alienation of taking the logarithm is pathogenic microorganism R.f bacterium liquid 60mL also, adds sanitary sewage 300mL to form 1 L reduction magnetization liquid, adjusts after pH=7.0, packs into detest to support in reactor;
Figure 460687DEST_PATH_IMAGE004
detest support reactor in by step
Figure 166475DEST_PATH_IMAGE002
overanxious concentrate respectively equivalent is transferred in the 1L reduction magnetization liquid that 5 tune pH are 7, after normal-temperature reaction 20d, filters, and magnetic separation in the intensity magnetic separator that is finally 0.6T in field intensity, magnetic mineral is final concentrate, non magnetic ore is that mine tailing abandons.
This routine result of implementation is: reduction magnetization liquid COD is down to 78mg/L from 336mg/L, and high intensity magnetic separation concentrate yield is 62.11%, throws in advance tail 37.89%, and final concentrate grade is 65.88%, and iron recovery is 74.67%.
Embodiment 2: its main chemical compositions of certain high-phosphor oolitic hematite is: TFe 43.50, and P 0.85, and S 0.028, SiO 218.80, Al 2o 36.67, CaO 3.66, and MgO 0.67, and MnO 0.17, K 2o, 0.79.Mineral composition: mineral species is comparatively simple, iron mineral be take bloodstone as main, is secondly limonite, accidental magnetic iron ore; Gangue mineral is in the majority with quartz, and inferior is chamosite, illite, collophane, dolomite, calcite and kaolinite.
Figure 501641DEST_PATH_IMAGE001
take the sample ore 100g of be crushed to-2mm, with levigate-200 orders of four rod mills of three rollers, account for 55%, preliminary election in the intensity magnetic separator that is then 1T by levigate sample ore in magnetic field intensity, magnetic mineral enters high intensity magnetic mineral, and non magnetic ore enters mine tailing, throws in advance except mine tailing;
Figure 292879DEST_PATH_IMAGE002
high intensity magnetic mineral again enters to be milled to-325 orders and accounts for 75% rear filtration;
the phase alienation of taking the logarithm is pathogenic microorganism Shewanella oneidensis bacterium liquid 100mL also, adds food processing wastewater 300mL to form 1 L reduction magnetization liquid, adjusts after pH=6.8, packs into detest to support in reactor;
Figure 931988DEST_PATH_IMAGE004
detest support reactor in by step
Figure 703635DEST_PATH_IMAGE002
overanxious concentrate respectively equivalent is transferred in the 1L reduction magnetization liquid that 5 tune pH are 7, after stirring at normal temperature 18d, filters, and magnetic separation in the intensity magnetic separator that is finally 0.8T in field intensity, magnetic mineral is final concentrate, non magnetic ore is that mine tailing abandons.
This routine result of implementation is: reduction magnetization liquid COD is down to 390mg/L from 1507mg/L, and high intensity magnetic separation concentrate yield is 76.23%, throws in advance tail 23.77%, and final concentrate grade is 64.47%, and iron recovery is 77.13%.
Embodiment 3: certain its main chemical compositions of kidney shape lean hematite is: TFe 29.28, and P 0.09, and S 0.07, and SiO2 52.94, and Al2O3 1.67, and CaO 1.01, and MgO 1.02, and MnO 0.08.Mineral composition: the structure of ore is comparatively complicated, take granular, en plaque, sheet, needle-like, column, flakey and nematoblastic texture as main.Structure be take banded structure as main, be secondly on the basis of banded structure, superpose rub Zou and brecciated structure; Also has a small amount of massive structure.
(1) take the sample ore 100g of be crushed to-2mm, with levigate-200 orders of four rod mills of three rollers, account for 55%, preliminary election in the intensity magnetic separator that is then 1.2T by levigate sample ore in magnetic field intensity, magnetic mineral enters high intensity magnetic mineral, non magnetic ore enters mine tailing, throws in advance except mine tailing;
Figure 218055DEST_PATH_IMAGE002
high intensity magnetic mineral again enters to be milled to-325 orders and accounts for 75% rear filtration;
Figure 100561DEST_PATH_IMAGE003
get anaerobic sludge 120mL, add breeding wastewater 300mL to form 1 L reduction magnetization liquid, adjust behind pH=6.9, pack into detest and support in reactor;
Figure 515361DEST_PATH_IMAGE004
detest support reactor in by step
Figure 457910DEST_PATH_IMAGE002
overanxious concentrate respectively equivalent is transferred in the 1L reduction magnetization liquid that 5 tune pH are 7, after normal-temperature reaction 12d, filters, and magnetic separation in the intensity magnetic separator that is finally 0.75T in field intensity, magnetic mineral is final concentrate, non magnetic ore is that mine tailing abandons.
This routine result of implementation is: reduction magnetization liquid COD is down to 2097mg/L from 8958mg/L, and high intensity magnetic separation concentrate yield is 68.46%, throws in advance tail 31.54%, and final concentrate grade is 60.22%, and iron recovery is 70.90%.
Embodiment 4: certain its main chemical compositions of complicated refractory hematite is: TFe 28.55, and P 0.031, and S 4.49, SiO 236.54, Al 2o 30.16, CaO 3.95, MgO1.98, MnO2.65, K 2o, 0.55.Mineral composition: this ore belongs to lean hematite ore, in ore, major metal mineral are bloodstone, pyrite and a small amount of magnetic iron ore, in ore bloodstone mainly with particulate misproportion dissemination in gangue mineral.Gangue mineral is mainly quartz, chlorite, carbonate and a small amount of allochite etc., take simultaneously chlorite as main easy argillization mineral more.In ore, sulfur-bearing is higher, mainly with pyrite form, exists.In addition, there is small part gangue mineral to be included in bloodstone.
Figure 958161DEST_PATH_IMAGE001
take the sample ore 100g of be crushed to-2mm, with levigate-200 orders of four rod mills of three rollers, account for 55%, preliminary election in the intensity magnetic separator that is then 1T by levigate sample ore in magnetic field intensity, magnetic mineral enters high intensity magnetic mineral, and non magnetic ore enters mine tailing, throws in advance except mine tailing;
Figure 378778DEST_PATH_IMAGE002
high intensity magnetic mineral again enters to be milled to-325 orders and accounts for 75% rear filtration;
Figure 913665DEST_PATH_IMAGE003
the phase alienation of taking the logarithm is pathogenic microorganism Geobacter sulfurreducens bacterium liquid 100mL also, adds food processing wastewater 300mL to form 1 L reduction magnetization liquid, adjusts after pH=6.0, packs into detest to support in reactor;
Figure 27114DEST_PATH_IMAGE004
detest support reactor in by step
Figure 504408DEST_PATH_IMAGE002
overanxious concentrate respectively equivalent is transferred in the 1L reduction magnetization liquid that 5 tune pH are 7, after stirring at normal temperature 15d, filters, and magnetic separation in the intensity magnetic separator that is finally 0.8T in field intensity, magnetic mineral is final concentrate, non magnetic ore is that mine tailing abandons.
This routine result of implementation is: reduction magnetization liquid COD is down to 372mg/L from 1507mg/L, and high intensity magnetic separation concentrate yield is 70.21%, throws in advance tail 29.79%, and final concentrate grade is 59.40%, and iron recovery is 72.98%.

Claims (5)

1. bloodstone biological reducing magnetization and the ore dressing method of upgrading, is characterized in that step is as follows:
(1) bloodstone that granularity is less than to 4mm is milled to fineness through ore mill and accounts for 50%～65% for-200 orders, for high intensity magnetic separation;
(2) sample ore magnetic separator magnetic separation step (1) being obtained;
(3) get step (2) magnetic concentrate and be milled to fineness for-200 orders～-325 order, for reduction magnetization through ore mill;
(4) select logarithmic phase alienation also pathogenic microorganism Rhodoferax ferrireducens (R.f), Geobacter sulfurreducens (G.s), Shewanella oneidensis, anaerobic sludge, add sewage culture medium to form reduction magnetization liquid;
(5) by reduction magnetization in step for magnetic concentrate (4) the gained reduction magnetization liquid obtaining in step (3);
(6) reduction concentrate step (5) being obtained again magnetic separation obtains final concentrate.
2. a kind of bloodstone biological reducing magnetization according to claim 1 and the ore dressing method of upgrading, is characterized in that: in described step (2), magnetic separation background lectromagnetism field is 0.8T～1.2T.
3. a kind of bloodstone biological reducing magnetization according to claim 1 and the ore dressing method of upgrading, is characterized in that: in described step (4), bacterium liquid and culture medium ratio are 1/4～3/7; After regulating reduction magnetization liquid pH to be 5.0～8.0, whole process is detested foster.
4. a kind of bloodstone biological reducing magnetization according to claim 1 and the ore dressing method of upgrading, it is characterized in that: in described step (5), magnetic concentrate addition is 1/9～3/7 with reduction magnetization solid and liquid ratio, and reduction magnetization process needs normal-temperature reaction 10～20d.
5. a kind of bloodstone biological reducing magnetization according to claim 1 and the ore dressing method of upgrading, is characterized in that, in step (6), magnetic separation background lectromagnetism field is 0.5T～1.0T.
CN201110171154.3A 2011-06-23 2011-06-23 Method for raising grade of hematite by biologically reducing and magnetizing and dressing Expired - Fee Related CN102319621B (en)

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