CN102172556B - High-pressure roller milling-preselection processing method for vanadic titanomagnetite - Google Patents
High-pressure roller milling-preselection processing method for vanadic titanomagnetite Download PDFInfo
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Abstract
The invention discloses a high-pressure roller milling-preselection processing method for vanadic titanomagnetite. The raw ore is subjected to coarse crushing, secondary crushing, fine crushing and high-pressure roller milling superfine crushing, an open circuit crushing, scrap circulation crushing or fully-closed circuit crushing method is adopted, and low-intensity magnetism and high-intensity magnetism preselection is performed. The method disclosed by the invention reduces the energy consumption of crushing and ore milling and improves the ore selection efficiency in comparison with the conventional process; and the low-intensity magnetism and high-intensity magnetism preselection can separately select the main target ores-titanomagnetite and ilmenite in the vanadic titanomagnetite with higher pertinence, and the ore selection flow is simpler. By adopting a high-pressure roller mill as the superfine crushing apparatus after fine crushing, the particle size of the final crushed product can be reduced, and meanwhile, the preselection tailing discarding before milling is realized, the milling grade is improved and the energy consumption of ore milling is reduced. Compared with the traditional process, the particle size of the product is small, the equipment operation rate is high, and the unit crushing energy consumption is low. Meanwhile, the superfine crushed product can be subjected to preselection tailing discarding so as to improve the milling grade, reduce the energy consumption of ore milling, lighten the burden on subsequent selection process and improve the production efficiency.
Description
Technical field
The invention belongs to technical field of mineral processing, relate to the vanadium titano-magnetite process technology, particularly a kind of high-pressure roller milling-preselection processing method for vanadic titanomagnetite.
Background technology
The Panxi Diqu iron ore resource is very abundant, is one of important iron ore base of China, and its ore reserve occupies China's iron ore reserves second, accounts for national gross reserves about 15%.Studies show that in a large number that for many years it is mainly take iron as main, and contain the multiple useful association compositions such as abundant vanadium, titanium, gallium, cobalt, nickel, scandium, sulphur, is as main large-scale metalliferous deposit take iron.Exploit at present Panzhihua Mining Area and built up each one in the Iron concentrator of producing sefstromite concentrate 4,800,000 t per year and the titanium ore dressing plant of producing ilmenite concentrate 250,000 t per year.But the grade of the iron ore concentrate of Iron concentrator is 54%, and the rate of recovery is 68%, and the feed preparation unit size of primary grinding is 15mm in the technological process; The ilmenite concentrate grade in titanium ore dressing plant is 47%, and the rate of recovery is 24%, and concentrate grade and the rate of recovery are not high.
The grinding operation energy consumption accounts for more than 80% of whole comminution operation consumption." how broken few mill " theory is the important symbol of comminution engineering power-saving technology fast development, the most effective approach that reduces power consume is to reduce ore grinding stone granularity, and main way is the Novel crushing equipment with maximization, large reduction ratio, high energy, low consumption at present.High-pressure roller mill is based on a kind of New Grinding Devices of bed of material pulverization principle design, and the principal character of bed of material fragmentation is: broken operating pressure is large, and fine fraction content is high in the broken final products; Crack for the ore deposit granule interior, thereby improved the degree of dissociation of ore, so that follow-up grinding operation power-dissipation-reduced or output increased.Other advantage can be summarized as: disposal ability is large, reaches as high as 3 400t/h; Unit is low in energy consumption, hangs down 20% ~ 50% approximately than gyratory crusher, rod mill, ball mill; Product granularity is thin; Floor space is few, equipment operation rate is high.
The tradition circuit grinding as shown in Figure 2.
High-pressure roller mill is the at present domestic and international how broken main flow of grinding less technical development of ore dressing field.The ultrafine grinding that adopts high-pressure roller mill to carry out ore can significantly reduce fragmentation-power consume, in traditional Three stage crushing with single closed circuit stage flow process in ore dressing plant, if the 3rd section broken high-pressure roller mill that adopts replaces gyratory crusher, comprehensive energy consumption broken and grinding operation can reduce by 5～10kWh/t.。
Summary of the invention
Problem for above-mentioned prior art exists the invention provides a kind of high-pressure roller milling-preselection processing method for vanadic titanomagnetite, reduces the granularity of finished breaking product, realizes simultaneously pre-selecting before grinding throwing tail, improves to enter to grind grade, reduces power consume.
The present invention carries out tailings discarding by preconcentration after adopting high-pressure roller mill to v-ti magnetite ore ultrafine grinding, the ball grinder graded closed-circuit system of the product introduction behind the tailings discarding by preconcentration, and processing step is as follows.
(1) with the raw ore coarse crushing, in rear granularity broken and in small, broken bits reach below the 12mm, carry out the high pressure roller mill ultrafine grinding, roll gap pressure is 4～6MPa during work, roller speed is 1～3m/min, roll gap is 2～30mm.The high pressure roller mill ultrafine grinding adopts open circuit crushing, rim charge circulation fragmentation or full cut-off road breaking method:
1. open circuit crushing: i.e. product after the vanadium titano-magnetite ultra-fine grinding directly feeds next work flow;
2. the rim charge circulation is broken: namely vanadium titano-magnetite is behind the high pressure roller mill ultrafine grinding, and rim charge directly returns high-pressure roller mill and newly carries out ultrafine grinding to the ore deposit merging again, and the ratio of rim charge circulation is 20% ~ 40% by mass percentage;
3. the full cut-off road is broken: after namely the product behind the vanadium titano-magnetite ultrafine grinding was the sieve screening of 3 ~ 5mm through sieve aperture, oversize returned high-pressure roller mill and newly pulverizes to the ore deposit merging again, and undersize feeds next work flow.
(2) preliminary election
High pressure roller mill ultrafine grinding product is introduced into the low-intensity magnetic field drum magnetic separator and carries out weak magnetic preliminary election, the drum magnetic separator magnetic field intensity is 95.04kA/m～199.05kA/m, titanomagnetite rough concentrate after the weak magnetic preliminary election enters titanomagnetite and sorts the independent sorting of flow process, weak magnetic preliminary rejection enters High gradient high intensity magnetic separator and carries out high magnetic pre-selection throwing tail, high gradient magnetic separator background magnetic field intensity is 398.1kA/m～796.2kA/m, the high magnetic pre-selection concentrate is the ilmenite rough concentrate, enter ilmenite and sort the independent sorting of flow process, the high magnetic pre-selection mine tailing enters the mine tailing treatment system, classification is processed, coarse grain is done heap, and microfine directly enters the Tailings Dam sedimentation.Preliminary election technique of the present invention has throws that the tail productive rate is high, preliminary election concentrate grade increase rate is large, make the follow-up simpler characteristics of flow process that sort.
Vanadium titano-magnetite high pressure roller mill of the present invention-preliminary election processing technology, broken and power consume reduces than common process, beneficiating efficiency improves, and weak magnetic-two sections preliminary elections of magnetic can more sort main target mineral titanomagnetite and the ilmenite in the vanadium titano-magnetite separately targetedly by force, make beneficiation flowsheet simpler.Use high-pressure roller mill as the ultrafine grinding equipment after in small, broken bits in vanadium titano-magnetite ore dressing flow process, can reduce the granularity of finished breaking product, can realize pre-selecting before grinding throwing tail simultaneously, raising enters to grind grade, reduces power consume.Compare with traditional crushing process, product granularity is thin, and equipment operation rate is high, and the unit comminution energy conssumption is low.Simultaneously can carry out tailings discarding by preconcentration to the ultrafine grinding product, raising enters to grind grade, reduces power consume, for follow-up sorting process reduces the heavy burdens, improves the production efficiency in ore dressing plant.
Description of drawings
Fig. 1 is the process flow diagram of the inventive method;
Fig. 2 is the traditional pulverizing of vanadium titano-magnetite-grinding process schematic flow sheet;
Fig. 3 is the granularmetric composition curve of the different high pressure roller mill ultrafine grinding technique milling product of the present invention.
The specific embodiment
Tcrude ore is the Panxi Diqu vanadium titano-magnetite, and water content 1% in mass ratio, iron grade 31.34% in the sample, TiO
2Quality percentage composition 12.46% is low-grade ferric oxide ore, its granularmetric composition such as table 1.
Carry out tailings discarding by preconcentration after adopting high-pressure roller mill to v-ti magnetite ore ultrafine grinding, the ball grinder graded closed-circuit system of the product introduction behind the tailings discarding by preconcentration, processing step is as follows.
(1) with the raw ore coarse crushing, in rear granularity broken and in small, broken bits reach below the 12mm, carry out the high pressure roller mill ultrafine grinding, roll gap pressure is 5MPa during work, roller speed is 1.6m/min, roll gap is 5mm.The high pressure roller mill ultrafine grinding adopts the open circuit crushing method: i.e. product after the vanadium titano-magnetite ultra-fine grinding directly feeds next work flow; The size distribution of high pressure roller mill ultra-fine grinding product is as shown in table 2.
(2) preliminary election
High pressure roller mill ultrafine grinding product is introduced into the low-intensity magnetic field drum magnetic separator and carries out weak magnetic preliminary election, the drum magnetic separator magnetic field intensity is 150.05kA/m, titanomagnetite rough concentrate after the weak magnetic preliminary election enters titanomagnetite and sorts the independent sorting of flow process, weak magnetic preliminary rejection enters High gradient high intensity magnetic separator and carries out high magnetic pre-selection throwing tail, high gradient magnetic separator background magnetic field intensity is 596.2kA/m, the high magnetic pre-selection concentrate is the ilmenite rough concentrate, enter ilmenite and sort the independent sorting of flow process, the high magnetic pre-selection mine tailing enters the mine tailing treatment system, classification is processed, coarse grain is done heap, and microfine directly enters the Tailings Dam sedimentation.
After the weak magnetic of ultra-fine grinding product process-strong two sections preliminary elections of magnetic, the pre-concentrate selection TFe of weak magnetic grade can reach 40.37%, and the rate of recovery reaches 80.29%, and weak magnetic preliminary rejection TFe grade can reach 16.4%, throws the tail productive rate and can reach 37.67%; High magnetic pre-selection is thrown the tail productive rate can reach 19.17%, concentrate TiO
2Grade can reach 14.2%, and true tailings TFe grade can reach 13.99%, TiO
2Grade can reach 7.89%, TiO
2The rate of recovery can reach 63.48%, and accumulative total is thrown the tail productive rate and can be reached 56.84%.
High pressure roller mill ultra-fine grinding product carries out weak magnetic-strong two sections preliminary elections of magnetic, its result such as table 3.
The vanadium titano-magnetite original ore size of table 1 embodiment 1,2 and 3 processing distributes
The size distribution of table 2 embodiment 1 high pressure roller mill ultra-fine grinding product
The weak magnetic of table 3 high pressure roller mill ultra-fine grinding product-strong two sections preliminary election results of magnetic
Carry out tailings discarding by preconcentration after adopting high-pressure roller mill to v-ti magnetite ore ultrafine grinding, the ball grinder graded closed-circuit system of the product introduction behind the tailings discarding by preconcentration, processing step is as follows.
(1) with the raw ore coarse crushing, in rear granularity broken and in small, broken bits reach below the 12mm, carry out the high pressure roller mill ultrafine grinding, roll gap pressure is 5MPa during work, roller speed is 1.6m/min, roll gap is 5mm.The high pressure roller mill ultrafine grinding adopts the rim charge cycle fragmentation method, and it is 20%, 30% and 40% that the ratio of rim charge circulation is respectively by mass percentage; The size distribution of high pressure roller mill ultra-fine grinding product is as shown in table 4.
(2) preliminary election
The rim charge circulation ratio is that 30% high pressure roller mill ultrafine grinding product is introduced into the low-intensity magnetic field drum magnetic separator and carries out weak magnetic preliminary election, the drum magnetic separator magnetic field intensity is 150.05kA/m, titanomagnetite rough concentrate after the weak magnetic preliminary election enters titanomagnetite and sorts the independent sorting of flow process, weak magnetic preliminary rejection enters High gradient high intensity magnetic separator and carries out high magnetic pre-selection throwing tail, high gradient magnetic separator background magnetic field intensity is 596.2kA/m, the high magnetic pre-selection concentrate is the ilmenite rough concentrate, enter ilmenite and sort the independent sorting of flow process, the high magnetic pre-selection mine tailing enters the mine tailing treatment system, classification is processed, coarse grain is done heap, and microfine directly enters the Tailings Dam sedimentation.
After the weak magnetic of ultra-fine grinding product process-strong two sections preliminary elections of magnetic, the pre-concentrate selection TFe of weak magnetic grade can reach 39.97%, and the rate of recovery reaches 79.65%, and weak magnetic preliminary rejection TFe grade can reach 16.5%, throws the tail productive rate and can reach 37.20%; High magnetic pre-selection is thrown the tail productive rate can reach 18.92%, concentrate TiO
2Grade can reach 14.50%, and true tailings TFe grade can reach 14.40%, TiO
2Grade can reach 8.19%, TiO
2The rate of recovery can reach 64.36%, and accumulative total is thrown the tail productive rate and can be reached 55.37%.
The rim charge circulation ratio is that 20% high pressure roller mill ultrafine grinding product is introduced into the low-intensity magnetic field drum magnetic separator and carries out weak magnetic preliminary election, the drum magnetic separator magnetic field intensity is 150.05kA/m, titanomagnetite rough concentrate after the weak magnetic preliminary election enters titanomagnetite and sorts the independent sorting of flow process, weak magnetic preliminary rejection enters High gradient high intensity magnetic separator and carries out high magnetic pre-selection throwing tail, high gradient magnetic separator background magnetic field intensity is 596.2kA/m, the high magnetic pre-selection concentrate is the ilmenite rough concentrate, enter ilmenite and sort the independent sorting of flow process, the high magnetic pre-selection mine tailing enters the mine tailing treatment system, classification is processed, coarse grain is done heap, and microfine directly enters the Tailings Dam sedimentation.
The rim charge circulation ratio is that 40% high pressure roller mill ultrafine grinding product is introduced into the low-intensity magnetic field drum magnetic separator and carries out weak magnetic preliminary election, the drum magnetic separator magnetic field intensity is 150.05kA/m, titanomagnetite rough concentrate after the weak magnetic preliminary election enters titanomagnetite and sorts the independent sorting of flow process, weak magnetic preliminary rejection enters High gradient high intensity magnetic separator and carries out high magnetic pre-selection throwing tail, high gradient magnetic separator background magnetic field intensity is 596.2kA/m, the high magnetic pre-selection concentrate is the ilmenite rough concentrate, enter ilmenite and sort the independent sorting of flow process, the high magnetic pre-selection mine tailing enters the mine tailing treatment system, classification is processed, coarse grain is done heap, and microfine directly enters the Tailings Dam sedimentation.
The size distribution of table 4 embodiment 2 high pressure roller mill ultra-fine grinding products
Embodiment 3
Carry out tailings discarding by preconcentration after adopting high-pressure roller mill to v-ti magnetite ore ultrafine grinding, the ball grinder graded closed-circuit system of the product introduction behind the tailings discarding by preconcentration, processing step is as follows.
(1) with the raw ore coarse crushing, in rear granularity broken and in small, broken bits reach below the 12mm, carry out the high pressure roller mill ultrafine grinding, roll gap pressure is 5MPa during work, roller speed is 1.6m/min, roll gap is 5mm.The high pressure roller mill ultrafine grinding adopts full cut-off road breaking method: after namely the product behind the vanadium titano-magnetite ultrafine grinding was the sieve screening of 3.5mm through sieve aperture, oversize returned high-pressure roller mill and newly pulverizes to the ore deposit merging again, and undersize feeds next work flow.
(2) preliminary election
High pressure roller mill ultrafine grinding product is introduced into the low-intensity magnetic field drum magnetic separator and carries out weak magnetic preliminary election, the drum magnetic separator magnetic field intensity is 150.05kA/m, titanomagnetite rough concentrate after the weak magnetic preliminary election enters titanomagnetite and sorts the independent sorting of flow process, weak magnetic preliminary rejection enters High gradient high intensity magnetic separator and carries out high magnetic pre-selection throwing tail, high gradient magnetic separator background magnetic field intensity is 596.2kA/m, the high magnetic pre-selection concentrate is the ilmenite rough concentrate, enter ilmenite and sort the independent sorting of flow process, the high magnetic pre-selection mine tailing enters the mine tailing treatment system, classification is processed, coarse grain is done heap, and microfine directly enters the Tailings Dam sedimentation.
After the weak magnetic of ultra-fine grinding product process-strong two sections preliminary elections of magnetic, the pre-concentrate selection TFe of weak magnetic grade can reach 41.20%, and the rate of recovery reaches 80.69%, and weak magnetic preliminary rejection TFe grade can reach 15.90%, throws the tail productive rate and can reach 36.50%; High magnetic pre-selection is thrown the tail productive rate can reach 18.30%, concentrate TiO
2Grade can reach 14.65%, and true tailings TFe grade can reach 15.10%, TiO
2Grade can reach 8.4%, TiO
2The rate of recovery can reach 62.60%, and accumulative total is thrown the tail productive rate and can be reached 56.73%.
The size distribution of table 5 embodiment 3 high pressure roller mill ultra-fine grinding products
1. open a way (being illustrated as open circuit among the figure);
2. the mass ratio of rim charge and middle material is 2:8 in the rim charge circulation 20%(high pressure roller mill crushed product, is illustrated as the 2:8 limit among the figure and follows);
3. the mass ratio of rim charge and middle material is 3:7 in the rim charge circulation 30%(high pressure roller mill crushed product, is illustrated as the 3:7 limit among the figure and follows);
4. the mass ratio of rim charge and middle material is 4:6 in the rim charge circulation 40%(high pressure roller mill crushed product, is illustrated as the 4:6 limit among the figure and follows);
5. full cut-off road (product is the sieve screening of 3.5mm through sieve aperture, is illustrated as among the figure-3.5mm full cut-off road)
Above-mentioned 5 kinds of different process products obtained therefroms
P 80(mass fraction is the corresponding size of accumulative total productive rate under 80% the sieve in the material) is respectively 4mm, 3.20mm, 3.18mm, 2.82mm and 2.4mm, and prior art production procedure product in small, broken bits
P 80Be 15.5mm.
Above-mentioned 5 kinds of different process products obtained therefroms are carried out grinding work assessment of indices (the control granularity is 0.074mm, and the sand return ratio is 250%), and the result is respectively 21.86kWh/t, 21.18kWh/t, 21.15kWh/t, 21.13kWh/t, 21.05kWh/t.And prior art product grinding work in small, broken bits index is 24.77kWh/t.
The raw ore that adopts is iron grade 29.96%, TiO
211.65%.
Carry out tailings discarding by preconcentration after adopting high-pressure roller mill to v-ti magnetite ore ultrafine grinding, the ball grinder graded closed-circuit system of the product introduction behind the tailings discarding by preconcentration, processing step is as follows.
(1) with the raw ore coarse crushing, in rear granularity broken and in small, broken bits reach below the 12mm, carry out the high pressure roller mill ultrafine grinding, to granularity be 3 ~ 5mm, roll gap pressure is 6MPa during work, roller speed is 3m/min, roll gap is 30mm.The high pressure roller mill ultrafine grinding adopts full cut-off road breaking method, and after namely the product behind the vanadium titano-magnetite ultrafine grinding was the sieve screening of 3mm through sieve aperture, oversize returned high-pressure roller mill and newly pulverizes to the ore deposit merging again, and undersize feeds next work flow.It is 21.23kWh/t that high pressure roller mill ultrafine grinding product is carried out ore grinding function assessment of indices (the control granularity is 0.074mm, and sand return is than being 250wt%) result, P
80Be 3.25mm.
(2) preliminary election
High pressure roller mill ultrafine grinding product is introduced into the low-intensity magnetic field drum magnetic separator and carries out weak magnetic preliminary election, the drum magnetic separator magnetic field intensity is 199.05kA/m, titanomagnetite rough concentrate after the weak magnetic preliminary election enters titanomagnetite and sorts the independent sorting of flow process, weak magnetic preliminary rejection enters High gradient high intensity magnetic separator and carries out high magnetic pre-selection throwing tail, high gradient magnetic separator background magnetic field intensity is 796.2kA/m, the high magnetic pre-selection concentrate is the ilmenite rough concentrate, enter ilmenite and sort the independent sorting of flow process, the high magnetic pre-selection mine tailing enters the mine tailing treatment system, classification is processed, coarse grain is done heap, and microfine directly enters the Tailings Dam sedimentation.
After weak magnetic-strong two sections preliminary elections of magnetic, the pre-concentrate selection TFe of weak magnetic grade can reach 40.12%, and the rate of recovery reaches 80.75%, and weak magnetic preliminary rejection TFe grade can reach 15.9%, throws the tail productive rate and can reach 35.76%; High magnetic pre-selection is thrown the tail productive rate can reach 20.25%, concentrate TiO
2Grade can reach 13.8%, and true tailings TFe grade can reach 13.21%, TiO
2Grade can reach 7.55%, TiO
2The rate of recovery can reach 64.15%, and accumulative total is thrown the tail productive rate and can be reached 55.64%.
The raw ore that adopts is iron grade 30.56%, TiO
212.68%.
Carry out tailings discarding by preconcentration after adopting high-pressure roller mill to v-ti magnetite ore ultrafine grinding, the ball grinder graded closed-circuit system of the product introduction behind the tailings discarding by preconcentration, processing step is as follows.
(1) with the raw ore coarse crushing, in rear granularity broken and in small, broken bits reach below the 12mm, carry out the high pressure roller mill ultrafine grinding, to granularity be 3 ~ 5mm, roll gap pressure is 4MPa during work, roller speed is 1m/min, roll gap is 2mm.The high pressure roller mill ultrafine grinding adopts full cut-off road breaking method, and after namely the product behind the vanadium titano-magnetite ultrafine grinding was the sieve screening of 5mm through sieve aperture, oversize returned high-pressure roller mill and newly pulverizes to the ore deposit merging again, and undersize feeds next work flow.
The P of high pressure roller mill ultrafine grinding products obtained therefrom
80Be 2.5mm.
It is 21.05kWh/t that the material that the high pressure roller mill ultrafine grinding is obtained carries out ore grinding function assessment of indices (control granularity is 0.074mm, and sand return is than being 250wt%) result.
(2) preliminary election
High pressure roller mill ultrafine grinding product is introduced into the low-intensity magnetic field drum magnetic separator and carries out weak magnetic preliminary election, the drum magnetic separator magnetic field intensity is 95.04kA/m, titanomagnetite rough concentrate after the weak magnetic preliminary election enters titanomagnetite and sorts the independent sorting of flow process, weak magnetic preliminary rejection enters High gradient high intensity magnetic separator and carries out high magnetic pre-selection throwing tail, high gradient magnetic separator background magnetic field intensity is 398.1kA/m, the high magnetic pre-selection concentrate is the ilmenite rough concentrate, enter ilmenite and sort the independent sorting of flow process, the high magnetic pre-selection mine tailing enters the mine tailing treatment system, classification is processed, coarse grain is done heap, and microfine directly enters the Tailings Dam sedimentation.
After weak magnetic-strong two sections preliminary elections of magnetic, the pre-concentrate selection TFe of weak magnetic grade can reach 39.88%, and the rate of recovery reaches 79.45%, and weak magnetic preliminary rejection TFe grade can reach 15.9%, throws the tail productive rate and can reach 38.44%; Two sections high magnetic pre-selections are thrown the tail productive rate and can be reached 19.72%, concentrate TiO
2Grade can reach 15.3%, and true tailings TFe grade can reach 14.69%, TiO
2Grade can reach 7.05%, TiO
2The rate of recovery can reach 64.34%, and accumulative total is thrown the tail productive rate and can be reached 56.55%.
Claims (1)
1. high-pressure roller milling-preselection processing method for vanadic titanomagnetite is characterized in that processing step is as follows:
(1) with the raw ore coarse crushing, in rear granularity broken and in small, broken bits reach below the 12mm, carry out the high pressure roller mill ultrafine grinding, the high pressure roller mill ultrafine grinding adopts open circuit crushing, rim charge circulation fragmentation or full cut-off road breaking method:
1. open circuit crushing: i.e. product after the vanadium titano-magnetite ultra-fine grinding directly feeds next work flow;
2. the rim charge circulation is broken: namely vanadium titano-magnetite is behind the high pressure roller mill ultrafine grinding, and rim charge directly returns high-pressure roller mill and newly carries out ultrafine grinding to the ore deposit merging again, and the ratio of rim charge circulation is 20%～40% by mass percentage;
3. the full cut-off road is broken: after namely the product behind the vanadium titano-magnetite ultrafine grinding was the sieve screening of 3～5mm through sieve aperture, oversize returned high-pressure roller mill and newly pulverizes to the ore deposit merging again, and undersize feeds next work flow;
Wherein the roll gap pressure of high pressure roller mill ultrafine grinding is 4～6MPa, and roller speed is 1～3m/min, and roll gap is 2～30mm;
(2) preliminary election
High pressure roller mill ultrafine grinding product is introduced into the low-intensity magnetic field drum magnetic separator and carries out weak magnetic preliminary election, the drum magnetic separator magnetic field intensity is 95.04kA/m～199.05kA/m, titanomagnetite rough concentrate after the weak magnetic preliminary election enters titanomagnetite and sorts the independent sorting of flow process, weak magnetic preliminary rejection enters High gradient high intensity magnetic separator and carries out high magnetic pre-selection throwing tail, high gradient magnetic separator background magnetic field intensity is 398.1kA/m～796.2kA/m, the high magnetic pre-selection concentrate is the ilmenite rough concentrate, enter ilmenite and sort the independent sorting of flow process, the high magnetic pre-selection mine tailing enters the mine tailing treatment system, classification is processed, coarse grain is done heap, and microfine directly enters the Tailings Dam sedimentation.
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