CN109939816B - Impurity-reducing titanium-selecting process for ilmenite - Google Patents
Impurity-reducing titanium-selecting process for ilmenite Download PDFInfo
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Abstract
The invention belongs to the technical field of mineral separation, and provides a process for impurity reduction and titanium separation of ilmenite, 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 a second stage of cyclone closed circuitThe method comprises the following steps of iron-removing low-intensity magnetic separation, iron-removing high-intensity magnetic separation, magnesium-removing rough flotation, magnesium-removing fine flotation, two-stage table reselection, sulfur-removing rough flotation, sulfur-removing scavenging flotation, sulfur-removing fine flotation and titanium flotation. Removing magnetic magnetite and pyrrhotite by weak magnetism, and removing false hematite with weak magnetism by strong magnetism, thereby removing iron and partial sulfur; removing magnesium-containing mica by demagging flotation and demagging flotation; most of pyrite and chalcopyrite, TiO and the sulfur-containing minerals are removed by desulfurization rough flotation, desulfurization scavenging flotation and desulfurization fine flotation2The grade and the recovery rate are good, the sulfur content is low, the magnesium oxide content is low, the iron content is low, and the raw ore is subjected to the iron-removing, magnesium-removing and sulfur-removing ore dressing treatment on the ilmenite by the process, so that high-quality ilmenite concentrate can be obtained.
Description
Technical Field
The invention belongs to the technical field of mineral separation, and particularly relates to a impurity-reducing titanium separation process for ilmenite.
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 titaniferous mineral, the most important source of metallic titanium, and the major minerals from which titanium and titanium dioxide are extracted. The chemical composition of ilmenite is related to the forming conditions, the ilmenite is produced in the super-basic rock and the basic rock, the MgO content is high, and MgO mainly exists in the form of mica; meanwhile, a certain amount of magnetite is often mixed in the ilmenite, and a small amount of weakly magnetic false hematite is often contained; the gangue components of ilmenite ore contain, in addition to mica, a proportion of sulphide minerals such as chalcopyrite, pyrite, pyrrhotite and the like.
TiO ore of the present, partially ilmenite2In an amount of 5% to 10%Meta, TiO 22The content is high, and the method has the condition of obtaining high-quality titanium concentrate. However, the titanium ore is often enriched along with the enrichment of ilmenite during gravity separation and flotation due to the fact that the specific gravity and the selectivity of magnetite, pseudohematite and ilmenite are similar during ore separation, so that the iron grade in the final titanium concentrate is too high and the titanium grade is reduced; if the elements harmful to the titanium concentrate, such as sulfur and magnesium, are not removed, the quality grade of the titanium concentrate can be greatly reduced when the elements enter the titanium concentrate, and even a titanium concentrate product with qualified quality cannot be produced, so in order to obtain high-quality titanium concentrate and improve the economic benefit of a concentrating mill, a titanium-impurity-reducing titanium-separating process for ilmenite, which can effectively remove iron, sulfur and magnesium in the titanium concentrate and ensure the quality of the titanium concentrate, needs to be developed.
Disclosure of Invention
In order to obtain titanium concentrate with higher quality from ilmenite, the invention provides an ilmenite impurity-reducing titanium separation process, which comprises three sections of crushing procedures, a closed circuit of a first section of ball milling and a cyclone, mixed pre-flotation, a closed circuit of a second section of ball milling and a second section of cyclone, deferrization weak magnetic separation, deferrization strong magnetic separation, magnesium-removing rough flotation, magnesium-removing fine flotation, a two-section table gravity separation, desulfurization rough flotation, desulfurization scavenging flotation, desulfurization fine flotation and titanium flotation;
after the raw ore is subjected to three-stage crushing procedures, feeding a crushed product with the granularity of 0-12mm into a first-stage ball mill in a closed circuit of a first-stage ball mill and a cyclone, feeding the product into the cyclone after the ore is ground by the first-stage ball mill, returning settled sand of the cyclone to the first-stage ball mill, and performing ball milling on the cyclone with the granularity P of the cyclone80Feeding overflow of 60-70 μm into mixed pre-flotation;
feeding the concentrate subjected to the mixed pre-flotation into a second-stage cyclone in a closed circuit of a second-stage ball mill and the second-stage cyclone, and returning settled sand of the second-stage cyclone to the second-stage cyclone through the second-stage ball mill;
p of second stage cyclone80Feeding the overflow of 30-40 mu m into a deferrization low-intensity magnetic separation process, feeding the concentrate subjected to the deferrization low-intensity magnetic separation process into a deferrization high-intensity magnetic separation process, feeding the concentrate subjected to the deferrization high-intensity magnetic separation process into a demagging rough flotation process, and feeding the underflow concentrate subjected to the demagging rough flotation process into a demagging fine flotation process;
feeding the underflow concentrate subjected to the demagging fine flotation into a first section of table concentrator for gravity separation, and feeding the middlings subjected to the gravity separation by the first section of table concentrator into a second section of table concentrator for gravity separation;
feeding the concentrate reselected by the two-section table concentrator into desulfurization rough flotation, feeding the underflow concentrate of the desulfurization rough flotation into desulfurization fine flotation, feeding the foam tailings of the desulfurization rough flotation into desulfurization scavenging flotation, and returning the tailings of the desulfurization fine flotation and the concentrate of the desulfurization scavenging flotation to the desulfurization rough flotation; feeding the concentrate subjected to the desulfurization and fine flotation into titanium flotation, wherein the concentrate subjected to the titanium flotation is titanium concentrate;
the tailings of the mixed pre-flotation, the tailings of the deferrization and weak magnetic separation, the tailings of the deferrization and strong magnetic separation, the tailings of the magnesium removal and coarse flotation, the tailings of the magnesium removal and fine flotation, the tailings of the two-stage table concentrator, the tailings of the desulfurization and scavenging flotation and the tailings of the titanium flotation jointly form the process tailings discarding tailings.
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-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 is returned to 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 are returned to the mixed pre-rough flotation, and the concentrate of the mixed pre-fine flotation is fed into a second cyclone in the closed circuit of a second ball mill and a second cyclone;
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; 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; and adding 36-45g of ethylenediamine collecting agent and 9-11g of foaming agent methyl isobutyl carbinol into each ton of ore in the first mixed pre-sweeping flotation.
Preferably, the titanium flotation comprises titanium rough flotation, titanium scavenging flotation and four times of titanium fine flotation; the titanium flotation is positive flotation, the concentrate of the desulfurization fine flotation is fed into the titanium rough flotation, the underflow tailings of the titanium rough flotation are fed into the titanium scavenging flotation, the froth concentrate of the titanium rough flotation is fed into the first titanium fine flotation, the concentrate of the first titanium fine flotation is fed into the second titanium fine flotation, the concentrate of the second titanium fine flotation is fed into the third titanium fine flotation, and the concentrate of the third titanium fine flotation is fed into the 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 subjected to titanium scavenging flotation are the tailings subjected to titanium flotation, and the tailings are discarded.
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 1800-2200GS, and the magnetic field intensity of the iron-removing high-intensity magnetic separation is 7000-9000 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, 220g of PH modifier sulfuric acid, 90-110g of collecting agent butyl xanthate and 18-22g of foaming agent 2# oil are added into each ton of ore in the desulfurization rough flotation; 55-66g of collecting agent butyl xanthate and 9-11g of foaming agent No. 2 oil are added into each ton of ore in the desulfurization and fine flotation.
Preferably, the useful minerals of the raw ore are mainly ilmenite, and the gangue minerals of the raw ore are mainly pyroxene, mica, quartz, magnetite, pseudohematite, pyrite, chalcopyrite and pyrrhotite; TiO 22The raw ore with the content of 8.5 percent, the content of S of 0.85 percent, the content of MgO of 3.5 percent and the iron grade of 13.5 percent is subjected to the impurity-reducing titanium-selecting process of the ilmenite to obtain TiO246.60% of Fe, 23.68% of MgO, 0.15% of S and TiO2The recovery rate of (a) was 60.0%, the recovery rate of Fe was 19.20%, the recovery rate of MgO was 1.09%, and the recovery rate of S was 1.93%.
The invention has the beneficial effects that: the iron, magnesium and sulfur removal titanium selection treatment is carried out by the process, and TiO is used2The raw ore with the content of (1) 8.5%, the content of S0.85% and the content of MgO 3.5% can obtain TiO246.60% of MgO, 0.35% of S and TiO2The recovery rate of the titanium concentrate is 60.0%, and the quality of the titanium concentrate is improved remarkably.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of a impurity-reducing titanium separation process of ilmenite;
FIG. 2 is a schematic diagram of a hybrid prefloat flow of an embodiment of a titanium impurity reduction and separation process for ilmenite;
FIG. 3 is a schematic diagram of a titanium flotation process flow of an embodiment of the impurity-reducing titanium separation process of ilmenite.
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 impurity-reducing titanium-separating process for ilmenite 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 second-stage cyclone S1004, a low-iron and low-intensity magnetic separation process S1006, a high-iron and high-intensity magnetic separation process S1007, a rough magnesium removal flotation process S1008, a fine magnesium removal flotation process S1009, a two-stage table reselection process, a rough sulfur removal flotation process S1012, a sulfur removal scavenging flotation process S1014, a fine sulfur removal flotation process S1013 and;
TiO in raw ore28.5%, S content 0.85%, MgO content 3.5% and iron grade 13.5%; the main component of useful minerals of the raw ore is ilmenite, and gangue minerals of the raw ore are mainly pyroxene, mica, quartz, magnetite, artificial hematite, pyrite, chalcopyrite and pyrrhotite; after raw ore is subjected to a three-stage crushing process S1001, crushed products with the granularity of 0-12mm are fed into a first-stage ball mill S1002 in a closed circuit of the first-stage ball mill S1002 and a cyclone S1003, the products after ore grinding by the first-stage ball mill S1002 are fed into the cyclone S1003, settled sand of the cyclone S1003 returns to the first-stage ball mill S1002, and the granularity P of the cyclone S1003 is80Feeding overflow of 60-70 mu m into a mixed pre-flotation S1100;
the concentrate of the mixed prefloating S1100 is fed into a second-stage cyclone S1004 in a closed circuit of the second-stage ball milling S1005 and the second-stage cyclone S1004, and settled sand of the second-stage cyclone S1004 returns to the second-stage cyclone S1004 through the second-stage ball milling S1005;
p of second cyclone S100480Feeding 30-40 mu m overflow into a deferrization low-intensity magnetic separation S1006, wherein the magnetic field intensity of the deferrization low-intensity magnetic separation S1006 is 2000GS, feeding the concentrate of the deferrization low-intensity magnetic separation S1006 into a deferrization high-intensity magnetic separation S1007, wherein the magnetic field intensity of the deferrization high-intensity magnetic separation S1007 is 8000GS, the concentrate yield of the deferrization high-intensity magnetic separation S1007 is 53.35%, and TiO214.42% of Fe, 12.2% of MgO, 1.09% of S, TiO2The recovery rate of 90.51%, the recovery rate of Fe of 48.21%, the recovery rate of MgO of 85.22% and the recovery rate of S of 68.50%; feeding the concentrate of the de-iron strong magnetic separation S1007 into de-magnesium rough flotation S1008, adding 200g/t of pH regulator sulfuric acid into the de-magnesium rough flotation S1008, 60g/t of ether amine collector and 15g/t of foaming agent 2# oil into the de-magnesium rough flotation S1008, and feeding the underflow concentrate of the de-magnesium rough flotation S1008 into de-magnesium fine flotation S1009; the ether amine collecting agent is added into the magnesium removal and fine flotation S1009 at the ratio of 30g/t for feeding, the concentrate yield of the magnesium removal and fine flotation S1009 is 43.02%, and the TiO content is217.36 percent of Fe, 14.57 percent of Fe, 0.52 percent of MgO,1.29% of S and TiO2The recovery rate of (1) was 87.85%, the recovery rate of Fe was 46.42%, the recovery rate of MgO was 6.40% and the recovery rate of S was 65.32%;
feeding the underflow concentrate of the magnesium-removing fine flotation S1009 into a first stage shaking table S1010 for reselection, and feeding the middlings reselected by the first stage shaking table S1010 into a second stage shaking table S1011 for reselection; the comprehensive yield of the concentrate reselected by the two-stage table concentrator is 31.55 percent, and the TiO concentration is220.79% of Fe, 16.45% of MgO, 1.7% of S, TiO2The recovery rate of (1) was 77.15%, the recovery rate of Fe was 38.44%, the recovery rate of MgO was 4.5% and the recovery rate of S was 63.32%;
the concentrate reselected by two sections of table beds is fed into a desulfurization rough flotation S1012, 200g/t of PH regulator sulfuric acid feeding, 100g/t of collecting agent butyl xanthate feeding and 20g/t of foaming agent 2# oil feeding are added into the desulfurization rough flotation S1012, the underflow concentrate of the desulfurization rough flotation S1012 is fed into a desulfurization fine flotation S1013, 60g/t of collecting agent butyl xanthate feeding and 10g/t of foaming agent 2# oil feeding are added into the desulfurization fine flotation S1013, the concentrate yield of the desulfurization fine flotation S1013 is 24.55%, and the TiO yield is 24.55%226.05% of Fe, 18.25% of MgO, 0.45% of S, 0.25% of TiO2The recovery rate of (1) was 75.25%, the recovery rate of Fe was 33.19%, the recovery rate of MgO was 3.16% and the recovery rate of S was 7.22%; the foam tailings of the desulfurization rough flotation S1012 are fed into a desulfurization scavenging flotation S1014, and the tailings of the desulfurization fine flotation S1013 and the concentrate of the desulfurization scavenging flotation S1014 are returned to the desulfurization rough flotation S1012; feeding the concentrate of the desulfurization and fine flotation S1013 into a titanium flotation S1200, wherein the concentrate of the titanium flotation S1200 is a titanium concentrate;
the tailings of the mixed pre-flotation S1100, the tailings of the deferrization weak magnetic separation S1006, the tailings of the deferrization strong magnetic separation S1007, the tailings of the magnesium removal rough flotation S1008, the tailings of the magnesium removal fine flotation S1009, the tailings of the two-stage shaking table, the tailings of the desulfurization scavenging flotation S1014 and the tailings of the titanium flotation S1200 jointly form process tailings, the yield of the process tailings is 89.06%, and the yield of the process tailings is TiO 120023.82% of Fe, 12.25% of MgO, 0.94% of S, TiO2The recovery rate of the catalyst is 40.0 percent, the recovery rate of Fe is 80.8 percent, the recovery rate of MgO is 98.91 percent, the recovery rate of S is 98.07 percent, and the processTailing discarding.
The process comprises two-stage ore grinding, mixed pre-flotation, deferrization low-intensity magnetic separation, deferrization high-intensity magnetic separation, demagging flotation, two-stage table shaking, desulfurization flotation and titanium flotation, wherein fine particles with high dissociation degree in the second stage of ore grinding overflow through weak magnetism to remove magnetic magnetite and pyrrhotite, and then through strong magnetism to remove false hematite with weak magnetism, partial sulfur is removed while iron is removed, the final iron grade is 12.2%, the iron recovery rate is 48.21%, the sulfur recovery rate is 68.5%, and the iron removal and sulfur reduction effects are very obvious compared with those of weak magnetism for ore feeding. Magnesium-containing mica is removed through the magnesium removal rough flotation and the magnesium removal fine flotation, the content of MgO in fine flotation concentrate is 0.52 percent, the recovery rate is 6.4 percent, and the magnesium removal effect is very obvious. Two-stage table reselection is adopted before desulfurization flotation, the characteristic that the table has better selectivity to metal minerals with large specific gravity of fine particles is fully utilized, partial gangue is further thrown away, and the tail flicking rate reaches 11.47%. Greatly reduces the treatment capacity of subsequent operation and further leads TiO to be2The content of the organic silicon fertilizer is improved from 17.36 percent to 20.79 percent, and the quality improvement effect is obvious. Most of pyrite and chalcopyrite containing sulfur minerals are removed by desulfurization flotation, so that TiO is ensured2On the premise of high yield, the sulfur content in the desulfurization flotation concentrate is reduced to 0.25%, the recovery rate is reduced to 7.22%, the desulfurization effect is very obvious, and the quality of subsequent titanium concentrate is powerfully guaranteed. The whole process adopts the processes of two-stage ore grinding, mixed pre-flotation, deferrization and low-intensity magnetic separation, deferrization and high-intensity magnetic separation, demagging and flotation, two-stage table shaking, desulfurization and flotation and titanium flotation, so that the yield is 10.94 percent, and TiO is obtained246.60% of Fe, 23.68% of MgO, 0.15% of S and TiO2The recovery rate of (a) was 60.0%, the recovery rate of Fe was 19.20%, the recovery rate of MgO was 1.09%, and the recovery rate of S was 1.93%. TiO 22The grade and the recovery rate of the titanium concentrate are good, the sulfur content is low, the magnesium oxide content is low, the iron content is low, the indexes of the titanium concentrate are very good, and the titanium concentrate is high-quality titanium concentrate.
FIG. 2 is a flow chart of a mixed pre-flotation process of an alternative embodiment of the impurity-reducing titanium separation process of ilmenite, wherein the mixed pre-flotation S1100 comprises a mixed pre-rough flotation S1101 and a mixed pre-fine flotationS1102 selecting and three times of mixed pre-sweeping flotation, wherein the mixed pre-flotation is reverse flotation; feeding overflow of a cyclone S1003 into a mixed pre-rough flotation S1101, adding 120g/t of feeding ethylene diamine replenishing 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 ethylene diamine replenishing 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, 1.25% S, TiO 22The recovery rate of 93.20%, the recovery rate of Fe 89.30%, the recovery rate of MgO 87.20% and the recovery rate of S92.98%; feeding the foam tailings of the mixed pre-rough flotation S1101 into a first mixed pre-sweep flotation S1103, adding 40g/t of feeding ethylene diamine replenishing agent and 10g/t of feeding foaming agent methyl isobutyl carbinol into the first mixed pre-sweep flotation S1103, feeding the foam tailings of the first mixed pre-sweep flotation S1103 into a second mixed pre-sweep flotation S1104, feeding the foam tailings of the second mixed pre-sweep flotation S1104 into a third mixed pre-sweep flotation S1105, returning the underflow concentrate of the third mixed pre-sweep flotation S1105 to the first mixed pre-sweep flotation S1103, returning the underflow concentrate of the first mixed pre-sweep flotation S1103, the underflow concentrate of the second mixed pre-sweep flotation S1104 and the foam tailings of the mixed pre-fine flotation S1102 to the mixed pre-rough flotation S1103, and feeding the concentrate of the mixed pre-fine flotation S1102 into a second cyclone S1004 in a closed circuit of a second ball milling S1005 and a second cyclone S1004;
and 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.
By the method of mixed pre-flotation, tailings with the yield of 36.77 percent are thrown off, and TiO is simultaneously thrown off2The yield of the mineral reaches 93.2 percent, and on the premise of ensuring the yield of target minerals, a large amount of pyroxene, quartz and other gangue minerals are thrown away, so that the processing capacity of subsequent operation is greatly reduced, the investment and operation cost is reduced, and the energy consumption is reduced. The mixed pre-scavenging flotation adopts a crossing return mode, namely, the concentrate of each stage of scavenging flotation returns to the upper stage of scavenging flotationThe ore pulp returned by each stage increases the time of primary scavenging flotation, and the TiO of the mixed pre-flotation concentrate is powerfully ensured2High yield of (2).
FIG. 3 is a titanium flotation flow of an alternative embodiment of the titanium impurity reduction and separation process for ilmenite, wherein the titanium flotation S1200 comprises titanium rough flotation S1201, titanium scavenging flotation S1202 and four times of titanium fine flotation; titanium flotation S1200 is direct flotation, concentrate of desulfurization concentrate flotation S1013 is fed into titanium rough flotation S1201, pH regulator sulfuric acid 2400g/t is added into titanium rough flotation S1201 for feeding, 1500g/t of collecting agent oxidized paraffin soap and 50g/t of foaming agent methoxypolypropylene glycol are fed, the underflow tailings of the titanium rough flotation S1201 are fed to a titanium scavenging flotation S1202, the foam concentrate of the titanium rough flotation S1201 is fed to a first titanium fine flotation S1203, 120g/t of sulfuric acid is added to the first titanium fine flotation S1203, the concentrate of the first titanium fine flotation S1203 is fed to a second titanium fine flotation S1204, 100g/t of sulfuric acid is added to the second titanium fine flotation S1204, the concentrate of the second titanium fine flotation S1204 is fed to a third titanium fine flotation S1205, 80g/t of sulfuric acid is added to the third titanium fine flotation S1205, the concentrate of the third titanium fine flotation S1205 is fed to a fourth titanium fine flotation S1206, and 60g/t of sulfuric acid is added to the fourth titanium fine flotation S1206; the underflow tailings of the fourth titanium fine flotation S1206 are fed into the second titanium fine flotation S1204, the underflow tailings of the third titanium fine flotation S1205 are fed into the first titanium fine flotation S1203, and the underflow tailings of the second titanium fine flotation S1204, the underflow tailings of the first titanium fine flotation S1203 and the froth concentrate of the titanium sweep flotation S1202 return to the titanium rough flotation S1201; the concentrate of the fourth titanium fine flotation S1206 is titanium concentrate; the yield of the titanium concentrate is 10.94 percent, and the TiO content246.60% of Fe, 23.68% of MgO, 0.15% of S and TiO2The recovery rate of (1) was 60.0%, the recovery rate of Fe was 19.20%, the recovery rate of MgO was 1.09%, and the recovery rate of S was 1.93%;
the tailings of the titanium scavenging flotation S1202 are the tailings of the titanium flotation S1200, and the tailings are discarded.
The tailings of the titanium flotation adopt a cross-over return mode, namely the tailings of each stage of the titanium flotation return to the upper-level flotation, and the ore pulp returned by each stage of the titanium flotation in the mode increases the time for the first-level flotationEffectively ensures the TiO of the titanium concentrate2High yield of (2).
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 (10)
1. An impurity-reducing titanium-selecting process for ilmenite comprises three crushing procedures, and is characterized in that: the method also comprises a closed circuit of a first-stage ball mill and a cyclone, mixed pre-flotation, a closed circuit of a second-stage ball mill and a second-stage cyclone, deferrization weak magnetic separation, deferrization strong magnetic separation, demagging rough flotation, demagging fine flotation, two-stage table gravity separation, desulfurization rough flotation, desulfurization scavenging flotation, desulfurization fine flotation and titanium flotation;
after the raw ore is subjected to three-stage crushing procedures, feeding a crushed product with the granularity of 0-12mm into a first-stage ball mill in a closed circuit of a first-stage ball mill and a cyclone, feeding the product into the cyclone after the ore is ground by the first-stage ball mill, returning settled sand of the cyclone to the first-stage ball mill, and performing ball milling on the cyclone with the granularity P of the cyclone80Feeding overflow of 60-70 μm into mixed pre-flotation;
feeding the concentrate subjected to the mixed pre-flotation into a second-stage cyclone in a closed circuit of a second-stage ball mill and the second-stage cyclone, and returning settled sand of the second-stage cyclone to the second-stage cyclone through the second-stage ball mill;
p of second stage cyclone80Feeding a 30-40 mu m overflow stream into a deferrization and low-intensity magnetic separation device, removing magnetic magnetite and pyrrhotite through the deferrization and low-intensity magnetic separation device, feeding a concentrate subjected to the deferrization and low-intensity magnetic separation device into a deferrization and high-intensity magnetic separation device, removing false hematite with low magnetism through the deferrization and high-intensity magnetic separation device, feeding a concentrate subjected to the deferrization and high-intensity magnetic separation device into a magnesium-removing rough flotation device, feeding a bottom concentrate subjected to the magnesium-removing rough flotation device into a magnesium-removing fine flotation device, and removing magnesium-containing mica through the magnesium-removing rough flotation device and;
feeding the underflow concentrate subjected to the demagging fine flotation into a first section of table concentrator for gravity separation, feeding middlings subjected to the gravity separation by the first section of table concentrator into a second section of table concentrator for gravity separation, and removing part of gangue through the gravity separation by the two sections of table concentrators;
feeding the concentrate reselected by the two-section table concentrator into desulfurization rough flotation, feeding the underflow concentrate of the desulfurization rough flotation into desulfurization fine flotation, feeding the foam tailings of the desulfurization rough flotation into desulfurization scavenging flotation, and returning the tailings of the desulfurization fine flotation and the concentrate of the desulfurization scavenging flotation to the desulfurization rough flotation; feeding the concentrate subjected to the desulfurization and fine flotation into titanium flotation, wherein the concentrate subjected to the titanium flotation is titanium concentrate;
the tailings of the mixed pre-flotation, the tailings of the deferrization and weak magnetic separation, the tailings of the deferrization and strong magnetic separation, the tailings of the magnesium removal and coarse flotation, the tailings of the magnesium removal and fine flotation, the tailings of the two-stage table concentrator, the tailings of the desulfurization and scavenging flotation and the tailings of the titanium flotation jointly form the process tailings discarding tailings.
2. The impurity-reducing titanium separation process for ilmenite as claimed in claim 1, characterized in that: 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 is returned to 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 are returned to the mixed pre-rough flotation, and the concentrate of the mixed pre-fine flotation is fed into a second cyclone in the closed circuit of a second ball mill and a second cyclone;
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.
3. The impurity-reducing titanium separation process for ilmenite as claimed in claim 1, characterized in that: the titanium flotation comprises titanium rough flotation, titanium scavenging flotation and four times of titanium fine flotation; the titanium flotation is positive flotation, the concentrate of the desulfurization fine flotation is fed into the titanium rough flotation, the underflow tailings of the titanium rough flotation are fed into the titanium scavenging flotation, the froth concentrate of the titanium rough flotation is fed into the first titanium fine flotation, the concentrate of the first titanium fine flotation is fed into the second titanium fine flotation, the concentrate of the second titanium fine flotation is fed into the third titanium fine flotation, and the concentrate of the third titanium fine flotation is fed into the 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 subjected to titanium scavenging flotation are the tailings subjected to titanium flotation, and the tailings are discarded.
4. The impurity-reducing titanium separation process for ilmenite as claimed in claim 1, characterized in that: the magnetic field intensity of the iron-removing weak magnetic separation is 1800-2200GS, and the magnetic field intensity of the iron-removing strong magnetic separation is 7000-9000 GS.
5. The ilmenite impurity-reducing titanium separation process according to claim 2, 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; adding 72-88g of ethylenediamine and 13-16g of methyl isobutyl carbinol into each ton of ore in the mixed pre-fine flotation; and adding 36-45g of ethylenediamine and 9-11g of methyl isobutyl carbinol into each ton of ore in the first mixed pre-sweeping flotation.
6. The impurity-reducing titanium separation process for ilmenite as claimed in 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 ore in the demagging fine flotation.
7. The impurity-reducing titanium separation process for ilmenite as claimed in claim 1, characterized in that: 220g of sulfuric acid, 90-110g of butyl xanthate and 18-22g of No. 2 oil are added into each ton of ore in the desulfurization rough flotation; in the desulfurization and fine flotation, 55-66g of butyl xanthate and 9-11g of No. 2 oil are added into each ton of ore.
8. The ilmenite impurity-reducing titanium separation process according to claim 3, 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.
9. The ilmenite impurity-reducing titanium separation process according to claim 3, 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.
10. The ilmenite impurity-reducing titanium separation process according to any one of claims 1 to 9, characterized in that: the main component of useful minerals of the raw ore is ilmenite, and gangue minerals of the raw ore are mainly pyroxene, mica, quartz, magnetite, artificial hematite, pyrite, chalcopyrite and pyrrhotite; TiO 22The raw ore with the content of 8.5 percent, the content of S of 0.85 percent, the content of MgO of 3.5 percent and the iron grade of 13.5 percent is subjected to the impurity-reducing titanium-selecting process of ilmenite to obtain TiO246.60% of Fe, 23.68% of MgO, 0.15% of S and TiO2The recovery rate of (a) was 60.0%, the recovery rate of Fe was 19.20%, the recovery rate of MgO was 1.09%, and the recovery rate of S was 1.93%.
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