CN109985720B - Mineral separation process for titanic iron ore containing mica - Google Patents
Mineral separation process for titanic iron ore containing mica Download PDFInfo
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Abstract
The invention belongs to the technical field of mineral separation, and discloses a mineral separation process for ilmenite containing mica, which comprises three stages of crushing procedures, a first stage of ball milling and cyclone closed circuit, mixed pre-flotation, a second stage of ball milling and fine screen closed circuit, magnesium removal rough flotation, magnesium removal fine flotation, iron removal low-intensity magnetic separation and a titanium mineral separation sub-process. The raw ore is subjected to demagging through demagging rough flotation and demagging fine flotation, and then is subjected to deferrization and mineral separation treatment through deferrization and low-intensity magnetic separation.
Description
Technical Field
The invention belongs to the technical field of beneficiation, and particularly relates to a beneficiation process of titanic iron ore containing mica.
Background
The metal titanium has the advantages of both steel (high strength) and aluminum (light weight), pure titanium has good plasticity, the toughness of the pure titanium is 2 times higher than that of pure iron, and the metal titanium also has good heat resistance and corrosion resistance. Because of these advantages, titanium is a prominent rare metal, and titanium and its alloys are used in the manufacture of airplanes, rockets, missiles, naval vessels, etc., and are widely used in the chemical and petroleum sectors.
Ilmenite is the most predominant mineral of metallic titanium, the most important source of titanium, and its chemical composition is dependent on the formation conditions. Ilmenite produced in ultrabasic rock, basic rock, has a high MgO content and MgO mainly exists in the form of mica, while a certain amount of magnetite tends to be incorporated in ilmenite.
Currently, part of the TiFe mine, TiO in TiFe ore2Is between 5% and 10%, TiO2The content is high, and the method has the condition of obtaining high-quality titanium concentrate. Magnetite in the ore is easy to be enriched with the enrichment of ilmenite because the specific gravity and the flotation selectivity of the magnetite are similar to those of ilmenite. The magnetite mixed into the titanium concentrate can reduce TiO in the titanium concentrate2While the magnesium-containing mica enters the titanium concentrate, the TiO content is not only reduced2And more importantly, the quality grade of the titanium concentrate is greatly reduced by magnesium. Therefore, there is a need to develop a mica-containing ilmenite beneficiation process which can effectively remove magnesium-containing mica and iron-containing magnetite in the ilmenite concentrate and guarantee the quality of the ilmenite concentrate.
Disclosure of Invention
In order to obtain high-quality titanium concentrate from ilmenite, the invention provides a mica-containing ilmenite beneficiation process, which comprises three stages of crushing procedures, a first stage of ball milling and cyclone closed circuit, a mixed pre-flotation, a second stage of ball milling and fine screen closed circuit, a demagnetising coarse flotation, a demagnetising fine flotation, a deferrization weak magnetic separation and a titanium beneficiation sub-process;
after the raw ore is subjected to three-stage crushing procedures, obtaining a crushed product with the granularity of 0-8mm, and entering a first-stage ball mill and a cyclone to be closed;
the first-stage ball milling and the cyclone are closed: feeding the crushed product of the three-stage crushing process into a first-stage ball mill, feeding the product into a cyclone after the first-stage ball mill grinds ores, returning settled sand of the cyclone to the first-stage ball mill to form a closed circuit, and ensuring the granularity P of the cyclone to be equal to that of the cyclone80Enabling overflow of 60-70 mu m to enter mixed pre-flotation;
the concentrate of the mixed pre-flotation is fed into a fine screen in a closed circuit of a second-stage ball milling and a fine screen, the oversize product with the granularity larger than 0.1mm is fed into the magnesium removal rough flotation, the magnesium removal rough flotation is reverse flotation, the underflow concentrate of the magnesium removal rough flotation is fed into a second-stage ball milling, the product after the second-stage ball milling and ore grinding returns to the fine screen to form a closed circuit, the granularity P is80Feeding the undersize product with the particle size of 30-40 mu m into a demagging fine flotation process, and feeding the underflow concentrate of the demagging fine flotation process into a deferrization low-intensity magnetic separation process; the concentrate subjected to iron-removing and low-intensity magnetic separation enters a titanium ore concentration sub-process, and the concentrate of the titanium ore concentration sub-process is titanium concentrate;
the tailings of the mixed pre-flotation, the tailings of the magnesium removal rough flotation, the tailings of the magnesium removal fine flotation, the tailings of the iron removal low-intensity magnetic separation and the tailings of the titanium ore dressing process form the process tailings discarding tailings together.
Preferably, the mixed pre-flotation comprises mixed pre-rough flotation, mixed pre-fine flotation and three times of mixed pre-sweeping flotation, and the mixed pre-flotation is reverse flotation; the overflow of the cyclone is fed into the mixed pre-rough flotation, the underflow concentrate of the mixed pre-rough flotation is fed into the mixed pre-fine flotation, the foam tailings of the mixed pre-rough flotation are fed into the first mixed pre-sweep flotation, the foam tailings of the first mixed pre-sweep flotation are fed into the second mixed pre-sweep flotation, the foam tailings of the second mixed pre-sweep flotation are fed into the third mixed pre-sweep flotation, the underflow concentrate of the third mixed pre-sweep flotation returns to the first mixed pre-sweep flotation, the underflow concentrate of the second mixed pre-sweep flotation and the foam tailings of the mixed pre-fine flotation return to the mixed pre-rough flotation, and the concentrate of the mixed pre-fine flotation is fed into the fine screen;
and the tailings obtained by the third mixed pre-scavenging flotation are the tailings obtained by the mixed pre-flotation, and are returned to the tailing discarding process.
Further, 108-132g of ethylenediamine collecting agent and 18-22g of methyl isobutyl carbinol foaming agent are added into each ton of ore in the mixed pre-coarse flotation; and adding 72-88g of ethylenediamine collecting agent and 13-16g of foaming agent methyl isobutyl carbinol into each ton of ore in the mixed pre-fine flotation.
Further, 32-45g of ethylenediamine collector and 9-12g of methyl isobutyl carbinol foaming agent are added into each ton of ore in the first mixed pre-sweeping flotation.
Preferably, the titanium ore concentration sub-process comprises two stages of shaking tables, titanium rough flotation, titanium scavenging flotation and four times of titanium fine flotation; feeding the concentrate subjected to the iron-removing low-intensity magnetic separation into a first-stage table concentrator, feeding the middling subjected to the gravity separation by the first-stage table concentrator into a second-stage table concentrator for gravity separation, feeding the concentrate of the first-stage table concentrator and the concentrate subjected to the gravity separation by the second-stage table concentrator into titanium rough flotation, feeding underflow tailings of the titanium rough flotation into titanium scavenging flotation, feeding the froth concentrate of the titanium rough flotation into first titanium fine flotation, feeding the concentrate of the first titanium fine flotation into second titanium fine flotation, feeding the concentrate of the second titanium fine flotation into third titanium fine flotation, and feeding the concentrate of the third titanium fine flotation into fourth titanium fine flotation; the underflow tailings of the fourth titanium fine flotation are fed into the second titanium fine flotation, the underflow tailings of the third titanium fine flotation are fed into the first titanium fine flotation, and the underflow tailings of the second titanium fine flotation, the underflow tailings of the first titanium fine flotation and the froth concentrate of the titanium scavenging flotation return to the titanium rough flotation; the concentrate obtained by the fourth titanium fine flotation is titanium concentrate;
the tailings of the first-stage shaking table, the tailings of the second-stage shaking table and the tailings of the titanium scavenging flotation belong to tailings of a titanium beneficiation son process, and are returned to process tailings for discarding tailings.
Further, 2150-2650g of pH regulator sulfuric acid, 1350-1650g of collecting agent oxidized paraffin soap and 45-55g of foaming agent methoxypolypropylene glycol are added into each ton of ore in the titanium rough flotation.
Furthermore, 108-132g of sulfuric acid is added to each ton of ore fed in the first titanium fine flotation, 90-110g of sulfuric acid is added to each ton of ore fed in the second titanium fine flotation, 72-88g of sulfuric acid is added to each ton of ore fed in the third titanium fine flotation, and 55-66g of sulfuric acid is added to each ton of ore fed in the fourth titanium fine flotation.
Preferably, the magnetic field intensity of the iron-removing low-intensity magnetic separation is 1800-2200 GS.
Preferably, 220g of PH modifier sulfuric acid, 55-66g of ether amine collecting agent and 13-16g of foaming agent 2# oil are added into each ton of ore in the magnesium removal rough flotation; 27-33g of ether amine collecting agent is added into each ton of feeding ore in the demagging and fine flotation.
Preferably, the useful mineral main component of the raw ore is ilmenite, and the gangue mineral of the raw ore is mainly pyroxene, mica, quartz and magnetite; TiO 22The raw ore with the content of 8.5 percent, the Fe content of 13.5 percent and the MgO content of 3.5 percent is subjected to the ore dressing process of the ilmenite containing mica to obtain TiO246.30% of Fe, 23.62% of MgO and TiO2The recovery rate of (a) was 60.0% of the titanium concentrate.
The invention has the beneficial effects that: the mica-containing ilmenite beneficiation process is adopted, the demagging is carried out through demagging rough flotation and demagging fine flotation, the deferrization and beneficiation treatment is carried out through deferrization and weak magnetic separation, and the TiO is subjected to deferrization and beneficiation treatment2After ilmenite with a content of 8.5% and a content of MgO of 3.5% is treated, TiO can be obtained246.30% of MgO, 0.35% of TiO2The recovery rate of the titanium concentrate with higher quality is 60.0 percent, and the quality improvement effect is obvious.
Drawings
FIG. 1 is a schematic flow diagram of an embodiment of a mica-containing ilmenite beneficiation process;
FIG. 2 is a schematic diagram of a hybrid prefloat flow scheme of an example of a mica-containing ilmenite beneficiation process;
FIG. 3 is a schematic diagram of a titanium ore beneficiation sub-process flow of an embodiment of a mica-containing ilmenite beneficiation process.
Detailed Description
To further illustrate the technical means and effects of the present invention for solving the technical problems, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited by the scope of the claims.
An alternative embodiment of the mica-containing ilmenite beneficiation process shown in fig. 1 comprises a three-stage crushing process S1001, a closed circuit of a first-stage ball mill S1002 and a cyclone S1003, a mixed pre-flotation process S1100, a closed circuit of a second-stage ball mill S1005 and a fine screen S1004, a magnesium removal rough flotation process S1006, a magnesium removal fine flotation process S1007, a low-intensity iron removal magnetic separation process S1008 and a titanium beneficiation sub-process S1200;
raw ore TiO28.5%, Fe content of 13.5% and MgO content of 3.5%; the main component of the useful minerals is ilmenite, and the gangue minerals mainly comprise pyroxene, mica, quartz and magnetite; after the raw ore is subjected to a three-stage crushing process S1001, obtaining a crushed product with the granularity of 0-8mm, and feeding the crushed product into a first-stage ball mill S1002 to be closed with a swirler S1003;
the first-stage ball milling S1002 and the cyclone S1003 are closed: the crushed product of the three-stage crushing procedure S1001 is fed into a first-stage ball mill S1002, the product is fed into a cyclone S1003 after the ore is ground by the first-stage ball mill S1002, the settled sand of the cyclone S1003 returns to the first-stage ball mill S1002 to form a closed circuit, and the granularity P of the cyclone S1003 is80Overflowing 60-70 mu m into a mixed pre-flotation S1100;
the concentrate of the mixed pre-flotation S1100 is fed into a fine screen S1004 in a closed circuit of a second stage ball-milling S1005 and the fine screen S1004, the oversize product with the granularity larger than 0.1mm is fed into a de-magnesium rough flotation S1006, the de-magnesium rough flotation S1006 is reverse flotation, 200g/t ore feeding of pH regulator sulfuric acid, 60g/t ore feeding of ether amine collecting agent (flotigam3135) and 15g/t ore feeding of foaming agent No. 2 oil are added into the de-magnesium rough flotation S1006, the underflow concentrate of the de-magnesium rough flotation S1006 is fed into a second stage ball-milling S1005, the product after the second stage ball-milling S1005 is ground is returned to the fine screen S1004 to form a closed circuit, the undersize product yield of the fine screen S1004 is 51.35%, and the TiO product yield is reduced to214.93% of Fe, 22.4% of MgO, 2.82% of TiO2Recovery rate of 90.20%, recovery of FeThe rate is 85.2 percent and the MgO recovery rate is 41.35 percent; particle size P80Feeding the product under the screen with the particle size of 30-40 mu m into a demagging and fine flotation S1007, adding an ether amine collector (flotigam3135) into the demagging and fine flotation S1007 to obtain ore at the concentration of 30g/t, wherein the yield of underflow concentrate of the demagging and fine flotation S1007 is 43.73%, and the yield of TiO is217.02% of Fe, 24.09% of MgO, 0.51% of TiO2The recovery rate of the catalyst is 87.55 percent, the recovery rate of Fe is 78.02 percent, and the recovery rate of MgO is 6.40 percent; the underflow concentrate of the magnesium removal and fine flotation S1007 is fed into a deferrization and low-intensity magnetic separation S1008, the magnetic field intensity of the deferrization and low-intensity magnetic separation S1008 is 2000GS, the concentrate yield of the deferrization and low-intensity magnetic separation S1008 is 37.69 percent, and TiO is219.23% of Fe, 15.22% of MgO, 0.55% of TiO2The recovery rate of the catalyst is 85.26 percent, the recovery rate of Fe is 42.50 percent and the recovery rate of MgO is 5.90 percent; the concentrate obtained by the iron-removing low-intensity magnetic separation S1008 enters a titanium ore concentration sub-process S1200, the concentrate obtained by the titanium ore concentration sub-process S1200 is titanium concentrate, the yield of the titanium concentrate is 11.02%, and TiO is obtained246.30% of Fe, 23.62% of MgO, 0.35% of TiO2The recovery rate of the catalyst is 60.0 percent, the recovery rate of Fe is 19.27 percent, and the recovery rate of MgO is 1.1 percent;
the tailings of the mixed pre-flotation S1100, the tailings of the magnesium-removing rough flotation S1006, the tailings of the magnesium-removing fine flotation S1007, the tailings of the iron-removing low-intensity magnetic separation S1008 and the tailings of the titanium beneficiation sub-process S1200 form process tailings together, the yield of the process tailings is 88.98%, and TiO is TiO23.82% of Fe, 12.25% of MgO, 3.89% of TiO2The recovery rate of the process tailings is 40.0 percent, the recovery rate of Fe is 80.73 percent, the recovery rate of MgO is 98.90 percent, and the process tailings are discarded.
Magnesium-containing coarse mica and fine mica are respectively removed by the magnesium removal rough flotation and the magnesium removal fine flotation, the content of MgO in concentrate of the fine flotation is 0.51 percent, the recovery rate is 6.4 percent, and the magnesium removal effect is very obvious. The magnetite which is a magnetic iron-containing mineral is removed by the low-intensity magnetic separation of the iron, the content of iron in the concentrate obtained by the low-intensity magnetic separation of the iron is 15.22 percent, the recovery rate is 42.5 percent, and the iron feeding and removing effect of the low-intensity magnetic separation of the iron is obvious. The demagging coarse flotation operation is introduced into the closed flow of the second stage of ball milling and fine screening, and not only is the magnesium-containing mica mostly in a coarse grain form utilizedThe method has the characteristics that a large amount of mica is removed when the granularity is larger than 0.1mm, the quality of subsequent titanium concentrate is guaranteed, the flotation tailings are directly subjected to tail flicking, the treatment capacity of secondary grinding is greatly reduced, and the energy consumption is saved. The titanium ore dressing process of the concentrate after the magnesium removal and the iron removal through two-stage table concentrator and titanium flotation obtains the yield of 11.02 percent and TiO246.30% of Fe, 23.62% of MgO, 0.35% of TiO2The recovery rate of the titanium concentrate is 60.0 percent, the recovery rate of the Fe is 19.27 percent, and the recovery rate of the MgO is 1.1 percent. TiO 22The grade and the recovery rate of the titanium concentrate are good, the iron content is low, the magnesium oxide content is low, the index of the titanium concentrate is very good, and the titanium concentrate is high-quality titanium concentrate.
The mixed pre-flotation process of the mica-containing ilmenite beneficiation process shown in fig. 2 comprises a mixed pre-coarse flotation process S1101, a mixed pre-fine flotation process S1102 and a third mixed pre-sweeping flotation process, wherein the mixed pre-flotation process S1100 is a reverse flotation process; feeding overflow of a cyclone S1003 into a mixed pre-rough flotation S1101, adding 120g/t of feeding ethylenediamine collecting agent and 20g/t of feeding foaming agent methyl isobutyl carbinol into the mixed pre-rough flotation S1101, feeding underflow concentrate of the mixed pre-rough flotation S1101 into a mixed pre-fine flotation S1102, adding 80g/t of feeding ethylenediamine collecting agent and 15g/t of feeding foaming agent methyl isobutyl carbinol into the mixed pre-fine flotation S1102, wherein the concentrate yield of the mixed pre-fine flotation S1102 is 63.23 percent, and TiO is212.53% Fe, 19.07% MgO, 4.83% TiO2The recovery rate of the catalyst is 93.20 percent, the recovery rate of Fe is 89.3 percent and the recovery rate of MgO is 87.20 percent; feeding the foam tailings of the mixed pre-rough flotation S1101 into a first mixed pre-scavenging flotation S1103, and adding 40g/t of feeding ethylenediamine collecting agent and 10g/t of feeding foaming agent methyl isobutyl carbinol into the first mixed pre-scavenging flotation S1103; the froth tailings of the first bulk pre-sweep flotation S1103 are fed into a second bulk pre-sweep flotation S1104, the froth tailings of the second bulk pre-sweep flotation S1104 are fed into a third bulk pre-sweep flotation S1105, the underflow concentrate of the third bulk pre-sweep flotation S1105 is returned to the first bulk pre-sweep flotation S1103, the underflow concentrate of the second bulk pre-sweep flotation S1104 and the bulk pre-concentrateReturning the foam tailings of the flotation S1102 to the mixed pre-rough flotation S1101, and feeding the concentrate of the mixed pre-fine flotation S1102 into a fine screen S1004; feeding undersize products of the fine screen S1004 into a demagging fine flotation S1007, feeding oversize products of the fine screen S1004 into a demagging rough flotation S1006, feeding concentrate of the demagging rough flotation S1006 into a second-stage ball milling S1005, and returning the products to the fine screen S1004 after the second-stage ball milling S1005 is ground to form a closed circuit;
the tailings of the third mixed pre-scavenging flotation S1105 are the tailings of the mixed pre-flotation S1100, and are returned to the process tailings discarding, and the tailings of the magnesium-removing rough flotation S1006 are also returned to the process tailings discarding.
By mixed pre-flotation, tailings with the yield of 36.77 percent are thrown off, and TiO is simultaneously used2The yield of the method reaches 93.2 percent, a large amount of pyroxene, quartz and other gangue minerals are thrown off on the premise of ensuring the yield of target minerals, the treatment capacity of subsequent operation is greatly reduced, the investment and operation cost is reduced, and the energy consumption is reduced. The concentrate of the mixed pre-flotation adopts a crossing return mode, namely the concentrate of each stage of sweeping flotation returns to the upper stage sweeping flotation, the ore pulp returned by each stage of sweeping flotation in the mode increases the time of the first stage sweeping flotation, and the TiO of the mixed pre-flotation concentrate is powerfully ensured2High yield of (2).
A titanium beneficiation subprocess flow of an alternative embodiment of a mica-containing ilmenite beneficiation process as shown in fig. 3, the titanium beneficiation subprocess S1200 comprising two stages of tables, titanium rough flotation S1203, titanium sweep flotation S1204 and four times of titanium fine flotation; feeding the concentrate from the iron-removing low-intensity magnetic separation S1008 into a first-stage shaking table S1201, feeding the middlings from the first-stage shaking table S1201 into a second-stage shaking table S1202 for reselection, wherein the comprehensive yield of the concentrate from the two stages of shaking tables for reselection is 26.55%, and TiO is224.06 percent of Fe, 17.25 percent of MgO, 0.41 percent of TiO2The recovery rate of the catalyst is 75.15 percent, the recovery rate of Fe is 33.93 percent, and the recovery rate of MgO is 3.10 percent; feeding the concentrate of the first-stage shaking table S1201 and the concentrate reselected by the second-stage shaking table S1202 into a titanium rough flotation S1203, adding 2400g/t of pH regulator sulfuric acid into the titanium rough flotation S1203 for ore feeding, 1500g/t of collecting agent oxidized paraffin soap for ore feeding, 50g/t of foaming agent methoxy polypropylene glycol for ore feeding, feeding the underflow tailings of the titanium rough flotation S1203 into a titanium scavenging flotation S1204, and performing the titanium rough flotation S120Feeding the froth concentrate of the step 3 into a first titanium fine flotation S1205, adding 120g/t of sulfuric acid into the first titanium fine flotation, feeding the concentrate of the first titanium fine flotation S1205 into a second titanium fine flotation S1206, adding 100g/t of sulfuric acid into the second titanium fine flotation, feeding the concentrate of the second titanium fine flotation S1206 into a third titanium fine flotation S1207, adding 80g/t of sulfuric acid into the third titanium fine flotation, feeding the concentrate of the third titanium fine flotation S1207 into a fourth titanium fine flotation S1208, and adding 60g/t of sulfuric acid into the fourth titanium fine flotation; the underflow tailings of the fourth titanium fine flotation S1208 are fed into the second titanium fine flotation S1206, the underflow tailings of the third titanium fine flotation S1207 are fed into the first titanium fine flotation S1205, and the underflow tailings of the second titanium fine flotation S1206, the underflow tailings of the first titanium fine flotation S1205 and the froth concentrate of the titanium sweep flotation S1204 are returned to the titanium rough flotation S1203; the concentrate of the fourth titanium fine flotation S1208 is titanium concentrate;
the tailings of the first-stage shaking table S1201, the tailings of the second-stage shaking table S1202 and the tailings of the titanium scavenging flotation S1204 belong to the tailings of the titanium beneficiation sub process S1200, and are classified as process tailings discarding.
The table concentrator is adopted for gravity separation before the titanium rough flotation, the characteristic that the table concentrator has better selectivity on metal minerals with large specific gravity of fine particles is fully utilized, part of gangue is further thrown away, the tail-flicking rate reaches 14.14 percent, the treatment capacity of subsequent operation is greatly reduced, and TiO is further treated2The content of the organic silicon dioxide is improved from 19.23 percent to 24.06 percent, and the quality improvement effect is obvious. The tailings of the titanium concentrate flotation adopt a cross-over return mode, namely the tailings of each stage of the titanium concentrate flotation return to the upper-level concentrate flotation, the ore pulp returned by each stage of the mode increases the time of the first-level concentrate flotation, and the TiO of the titanium concentrate is powerfully ensured2High recovery rate.
The above-mentioned 'feeding per ton' means the weight of the ore fed to the process, and is the same as the 'feeding per ton'.
The present invention is capable of other embodiments, and various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. The mineral separation process of the mica-containing ilmenite comprises three crushing procedures and is characterized in that: the method also comprises a first-stage ball milling and cyclone closed circuit, a mixed pre-flotation, a second-stage ball milling and fine screening closed circuit, a magnesium removal rough flotation, a magnesium removal fine flotation, a deferrization weak magnetic separation and a titanium ore dressing sub-process;
after the raw ore is subjected to three-stage crushing procedures, obtaining a crushed product with the granularity of 0-8mm, and entering a first-stage ball mill and a cyclone to be closed;
the first-stage ball milling and the cyclone are closed: feeding the crushed product of the three-stage crushing process into a first-stage ball mill, feeding the product into a cyclone after the first-stage ball mill grinds ores, returning settled sand of the cyclone to the first-stage ball mill to form a closed circuit, and ensuring the granularity P of the cyclone to be equal to that of the cyclone80Enabling overflow of 60-70 mu m to enter mixed pre-flotation;
the mixed pre-flotation comprises mixed pre-rough flotation, mixed pre-fine flotation and third mixed pre-sweeping flotation, and the mixed pre-flotation is reverse flotation; the overflow of the cyclone is fed into the mixed pre-rough flotation, the underflow concentrate of the mixed pre-rough flotation is fed into the mixed pre-fine flotation, the foam tailings of the mixed pre-rough flotation are fed into the first mixed pre-scavenging flotation, the foam tailings of the first mixed pre-scavenging flotation are fed into the second mixed pre-scavenging flotation, the foam tailings of the second mixed pre-scavenging flotation are fed into the third mixed pre-scavenging flotation, the underflow concentrate of the third mixed pre-scavenging flotation returns to the first mixed pre-scavenging flotation, and the underflow concentrate of the first mixed pre-scavenging flotation, the underflow concentrate of the second mixed pre-scavenging flotation and the foam tailings of the mixed pre-fine flotation return to the mixed pre-rough flotation; the concentrate obtained by the mixed pre-fine flotation is the concentrate obtained by the mixed pre-fine flotation; feeding the concentrate subjected to the mixed pre-flotation into a fine screen in a closed circuit of a second-stage ball milling and the fine screen, feeding the oversize product with the granularity of more than 0.1mm into a demagging rough flotation, wherein the demagging rough flotation is reverse flotation, feeding the underflow concentrate subjected to the demagging rough flotation into a second-stage ball milling, returning the product subjected to the second-stage ball milling and grinding into a closed circuit, feeding the undersize product with the granularity of less than or equal to 0.1mm into a demagging fine flotation, and feeding the underflow concentrate subjected to the demagging fine magnetic separation; the concentrate subjected to iron-removing and low-intensity magnetic separation enters a titanium ore concentration sub-process, and the concentrate of the titanium ore concentration sub-process is titanium concentrate;
the tailings obtained by the third mixed pre-scavenging flotation are the tailings obtained by the mixed pre-flotation; the tailings of the mixed pre-flotation, the tailings of the magnesium removal rough flotation, the tailings of the magnesium removal fine flotation, the tailings of the iron removal low-intensity magnetic separation and the tailings of the titanium ore dressing process form the process tailings discarding tailings together.
2. The mica-containing ilmenite beneficiation process of claim 1, characterized in that: the titanium beneficiation sub-process comprises two-section table shaking, titanium rough flotation, titanium scavenging flotation and four-time titanium fine flotation; feeding the concentrate subjected to the iron-removing low-intensity magnetic separation into a first-stage table concentrator, feeding the middling subjected to the gravity separation by the first-stage table concentrator into a second-stage table concentrator for gravity separation, feeding the concentrate of the first-stage table concentrator and the concentrate subjected to the gravity separation by the second-stage table concentrator into titanium rough flotation, feeding underflow tailings of the titanium rough flotation into titanium scavenging flotation, feeding the froth concentrate of the titanium rough flotation into first titanium fine flotation, feeding the concentrate of the first titanium fine flotation into second titanium fine flotation, feeding the concentrate of the second titanium fine flotation into third titanium fine flotation, and feeding the concentrate of the third titanium fine flotation into fourth titanium fine flotation; the underflow tailings of the fourth titanium fine flotation are fed into the second titanium fine flotation, the underflow tailings of the third titanium fine flotation are fed into the first titanium fine flotation, and the underflow tailings of the second titanium fine flotation, the underflow tailings of the first titanium fine flotation and the froth concentrate of the titanium scavenging flotation return to the titanium rough flotation; the concentrate obtained by the fourth titanium fine flotation is titanium concentrate;
the tailings of the first-stage shaking table, the tailings of the second-stage shaking table and the tailings of the titanium scavenging flotation belong to tailings of a titanium beneficiation son process, and are returned to process tailings for discarding tailings.
3. The mica-containing ilmenite beneficiation process of claim 1, characterized in that: the magnetic field intensity of the iron-removing weak magnetic separation is 1800-2200 GS.
4. The mica-containing ilmenite beneficiation process of claim 1, characterized in that: 220g of sulfuric acid-containing acid, 55-66g of ether amine and 13-16g of 2# oil are added into each ton of ore in the magnesium-removing rough flotation; 27-33g of ether amine is added into each ton of feeding ore in the demagging fine flotation.
5. The mica-containing ilmenite beneficiation process of claim 1, characterized in that: 108-132g of ethylenediamine and 18-22g of methyl isobutyl carbinol are added into each ton of ore in the mixed pre-rough flotation; 72-88g of ethylenediamine and 13-16g of methyl isobutyl carbinol are added into each ton of ore in the mixed pre-fine flotation.
6. The mica-containing ilmenite beneficiation process of claim 1, characterized in that: 32-45g of ethylenediamine and 9-12g of methyl isobutyl carbinol are added into each ton of ore in the first mixed pre-sweeping flotation.
7. The mica-containing ilmenite beneficiation process of claim 2, characterized in that: in the titanium crude flotation, 2150 g of sulfuric acid, 2650g of oxidized paraffin soap, 1650g of oxidized paraffin soap and 45-55g of methoxypolypropylene glycol are added into each ton of ore.
8. The mica-containing ilmenite beneficiation process of claim 2, characterized in that: and 108-132g of sulfuric acid is added to each ton of ore in the first titanium fine flotation, 90-110g of sulfuric acid is added to each ton of ore in the second titanium fine flotation, 72-88g of sulfuric acid is added to each ton of ore in the third titanium fine flotation, and 55-66g of sulfuric acid is added to each ton of ore in the fourth titanium fine flotation.
9. The mica-containing ilmenite beneficiation process according to any one of claims 1 to 8, characterized in that: the main component of useful minerals of the raw ore is ilmenite, and gangue minerals of the raw ore mainly comprise pyroxene, mica, quartz and magnetite; TiO 22The raw ore with the content of 8.5 percent, the grade of the Fe content of 13.5 percent and the content of the MgO of 3.5 percent is subjected to the ore dressing process of the ilmenite containing mica to obtain TiO246.30% of Fe, 23.62% of MgO and TiO2The recovery rate of (a) was 60.0% of the titanium concentrate.
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