CN109954577B - Beneficiation process for ilmenite of titanomagnetite - Google Patents
Beneficiation process for ilmenite of titanomagnetite Download PDFInfo
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- CN109954577B CN109954577B CN201910246325.0A CN201910246325A CN109954577B CN 109954577 B CN109954577 B CN 109954577B CN 201910246325 A CN201910246325 A CN 201910246325A CN 109954577 B CN109954577 B CN 109954577B
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Abstract
The invention belongs to the technical field of beneficiation and provides a titanomagnetite ilmenite beneficiation process which comprises three-section crushing and large-granularity dry separation procedures, a closed circuit of a high-pressure roller mill and a fine-grain dry separator, an iron beneficiation sub-process, strong magnetic separation, two-section shaking tables, desulfurization rough flotation, desulfurization scavenging flotation, desulfurization fine flotation and titanium flotation. Through the large-granularity dry separation in the three-section crushing and large-granularity dry separation process and the fine particle dry separation machine in the closed circuit of the high-pressure roller mill and the fine particle dry separation machine, waste rocks with the yield of 68 percent are removed through the two-section dry separation, the treatment capacity of subsequent ore grinding and sorting operations is greatly reduced, the energy consumption and the medium consumption are reduced, and the cost is saved; and carrying out desulfurization treatment by desulfurization rough flotation, desulfurization scavenging flotation and desulfurization fine flotation. By using the process to treat the titanomagnetite and the ilmenite which contain less iron and titanium, iron ore concentrate and titanium ore concentrate with higher grade can be obtained.
Description
Technical Field
The invention belongs to the technical field of beneficiation, and particularly relates to a beneficiation process for ilmenite of titanomagnetite.
Background
Titanomagnetite and ilmenite are important iron and titanium ore resources, particularly for titanium, the source of which is primarily this ore. The main useful metals of this type of ore are iron and titanium, the iron content of which is generally not high, mostly between 12% and 20%, TiO2The content is generally between 2 and 5 percent, and because titanium is mainly used as a high-grade alloy raw material and is applied in the national defense industry and the aviation industry in a large quantity, and the price of titanium concentrate is higher, the comprehensive recovery of iron and titanium is more necessary for the ore with low iron grade of raw ore.
Titanomagnetite is generally associated with ilmenite, both minerals being in a intergrown state in the case of coarse particles. The occurrence state of the iron in the ore is complex, the iron distributed in the titanomagnetite is generally about 50 percent, and the rest part mainly exists in the forms of ilmenite, pseudohematite, hematite (limonite) and iron silicate. MineThe titanium in the stone is also more dispersed, with about 2/3% of the titanium being present in the form of ilmenite, the remainder being present in titanomagnetites and silicate minerals, and in the form of TiO in titanomagnetites2Typically into the iron concentrate along with the titanomagnetite. In China, generally, the ore also contains a certain amount of pyrite and chalcopyrite, so the sulfur content is high, and the sulfur easily enters the final titanium concentrate along with flotation, thereby influencing the quality and the selling price of the titanium concentrate. From the view of ore disseminated particle size, the ore dissociation particle size is fine, and the grinding particle size needs to reach-200 meshes and accounts for more than 85 percent.
From the above analysis, the overall characteristics of the ore are that the embedded particle size is fine, the composition of iron minerals and titanium minerals is complex, the iron content of the raw ore is low, the proportion of iron in the easily-recovered titanomagnetite is not high, the titanium content of the raw ore is not high, part of titanium enters into iron ore concentrate, and the sulfur content in the raw ore is higher. In order to obtain high iron grade and recovery rate, titanium grade and recovery rate need to grind all raw ores, and efficient recovery of nonmagnetic useful minerals generally needs a very complicated magnetic separation-gravity separation-flotation process, which often consumes high energy, medium and chemical agents and has high beneficiation cost for the minerals with low raw ore grade and fine granularity, and even causes the cost loss of a beneficiation plant. Therefore, there is a need to develop a process for separating titanomagnetite and ilmenite, which can produce two high-quality concentrates of titanium and iron, can effectively remove sulfur, and has the advantages of low energy consumption, low medium consumption and low separation cost.
Disclosure of Invention
In order to solve the problems of the existing beneficiation technologies, the invention provides a titanomagnetite ilmenite beneficiation process which comprises three-section crushing and large-granularity dry beneficiation procedures, a closed circuit of a high-pressure roller mill and a fine-grain dry beneficiation machine, an iron beneficiation sub-process, strong magnetic separation, two-section shaking tables, desulfurization rough flotation, desulfurization scavenging flotation, desulfurization fine flotation and titanium flotation;
after the raw ore is subjected to three-section crushing and large-granularity dry separation machine procedures, feeding a crushed product with the granularity of 0-20mm into a high-pressure roller mill and a high-pressure roller mill in a closed circuit of a fine particle dry separation machine, feeding a product with the granularity of 0-5mm of the high-pressure roller mill into the fine particle dry separation machine, returning dry separation middlings of the fine particle dry separation machine to the high-pressure roller mill to form a closed circuit, feeding dry separation concentrate of the fine particle dry separation machine into an iron ore separation seed process, wherein the concentrate of the iron ore separation seed process is iron concentrate;
the tailings of the iron beneficiation son process are fed into strong magnetic separation, the concentrate of the strong magnetic separation is fed into a first section of table concentrator for gravity separation, and the middlings of the first section of table concentrator for gravity separation are fed 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 large-granularity dry separation waste rocks of the three-section crushing and large-granularity dry separation process and the tailings of the fine-particle dry separation machine form dry tailings discarding tailings; the tailings subjected to strong magnetic separation, the tailings subjected to two-stage table reselection, the tailings subjected to desulfurization and scavenging flotation and the tailings subjected to titanium flotation jointly form wet tailings discarding.
Preferably, the iron ore beneficiation sub-process comprises a first section of ball milling and cyclone closed circuit, a first section of strong magnetic separation, a second section of ball milling and second section of cyclone closed circuit, a weak magnetic separation, a second section of strong magnetic scavenging and a magnetic separation column;
feeding dry concentrate of a fine particle dry separator into a first section ball milling of a closed circuit of a first section ball milling and a cyclone, discharging ore from the first section ball milling to the cyclone, returning settled sand of the cyclone to the first section ball milling, feeding overflow of 60 percent of 0-200 meshes of the cyclone into the first section strong magnetic separation, feeding concentrate of the first section strong magnetic separation into a second section cyclone in a closed circuit of a second section ball milling and a second section cyclone, feeding settled sand of the second section cyclone into a second section ball milling, returning the second section cyclone after the second section ball milling, feeding overflow of 90 percent of 0-200 meshes of the second section cyclone into weak magnetic separation, feeding tailings of the weak magnetic separation into a second section strong magnetic separation, feeding the concentrate of the weak magnetic separation and the concentrate of the second section strong magnetic separation into a magnetic separation column, returning the tailings of the magnetic separation column to the weak magnetic separation, wherein the concentrate of the magnetic separation column is iron concentrate;
the tailings of the first section of strong magnetic separation and the tailings of the second section of strong magnetic scavenging are the tailings of the iron ore beneficiation son process.
Further, the magnetic field intensity of the first-stage strong magnetic separation is 7200-.
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 are classified into wet tailings discarding.
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, 72-88 g 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 fine particle dry separation machine is 9000-11000 GS; the magnetic field intensity of the strong magnetic separation is 3600-.
Preferably, the constant dry separator is used in the closed circuit of the high-pressure roller mill and the dry separator for fine particles to dry separate three products of concentrate, middling and tailings, and the constant dry separator controls the middling yield by adjusting the position of a material distributing plate of the constant dry separator for middling yield to be constant.
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 titanomagnetite, ilmenite and pseudohematite, and the gangue minerals of the raw ore are mainly amphibole, pyroxene, plagioclase, pyrite and chalcopyrite; fe grade of 18.50% and TiO2The raw ore with the content of 2.85 percent and the sulfur content of 0.52 percent is treated by the ilmenite beneficiation process of the titanomagnetite to obtain the raw ore with the Fe grade of 63.0 percent and the TiO2Has a content of 3.0%, an S content of 0.15%, a Fe recovery rate of 43.51%, and TiO2The recovery rate of the iron ore concentrate is 13.45 percent, the recovery rate of S is 3.69 percent, the grade of Fe is 21.5 percent, and TiO2Has a content of 44.0%, an S content of 0.14%, a Fe recovery rate of 2.41%, and TiO2The recovery rate of (a) was 32.0% and the S recovery rate was 0.56% of the titanium concentrate.
According to the invention, through the large-granularity dry separation in the three-section crushing and large-granularity dry separation process and the fine particle dry separation machine in the closed circuit of the high-pressure roller mill and the fine particle dry separation machine, waste rocks with the yield of 68% are removed through the two-section dry separation, the treatment capacity of subsequent ore grinding and separation operations is greatly reduced, the energy consumption and the medium consumption are reduced, and the cost is saved; and carrying out desulfurization treatment by desulfurization rough flotation, desulfurization scavenging flotation and desulfurization fine flotation. The process is used for treating titanomagnetite and ilmenite with low iron and titanium contents, wherein the grade of Fe is 18.50 percent, and TiO is used2The raw ore with the content of 2.85 percent and the sulfur content of 0.52 percent can obtain iron ore concentrate with the Fe grade of 63.0 percent, the S content of 0.15 percent and the Fe recovery rate of 43.51 percent, and simultaneously obtain TiO2Is 44.0%, S content is 0.14% and TiO2The recovery rate of the titanium concentrate is 32.0%, the obtained iron concentrate and the titanium concentrate have low S content and high grade and recovery rate, and the process has remarkable effect of improving the quality and the recovery rate of the iron concentrate and the titanium concentrate processed by the titanomagnetite ilmenite.
Drawings
FIG. 1 is a schematic flow diagram of an embodiment of a titanomagnetite ilmenite beneficiation process;
FIG. 2 is a schematic view of an iron beneficiation sub-process flow of an embodiment of a titanomagnetite ilmenite beneficiation process;
FIG. 3 is a schematic view of a titanium flotation process of an embodiment of a titanomagnetite 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.
The flow of the optional embodiment of the ilmenite beneficiation process of titanomagnetite shown in fig. 1 comprises a three-section crushing and large-particle-size dry separation process S1001, a closed circuit of a high-pressure roller mill and a fine particle dry separator, an iron beneficiation sub-process S1100, a strong magnetic separation S1004, a two-section shaking table, a desulfurization rough flotation S1007, a desulfurization scavenging flotation S1009, a desulfurization fine flotation S1008 and a titanium flotation S1200;
the Fe grade of the raw ore is 18.50 percent, and the TiO content2The content of the mineral is 2.85 percent and the sulfur content is 0.52 percent, the main components of the useful minerals are titanomagnetite, ilmenite and false hematite, and the gangue minerals are mainly silicate minerals such as amphibole, pyroxene and diagenetic rock and sulfide minerals such as pyrite and chalcopyrite; raw ore is subjected to large-granularity dry separation with magnetic field intensity of 10000GS in a three-section crushing and large-granularity dry separation machine process S1001, a crushed product with granularity of 0-20mm is fed into a high-pressure roller mill S1002 in a closed circuit of the high-pressure roller mill and a fine-grain dry separation machine after passing through the three-section crushing and large-granularity dry separation machine process S1001, a product with granularity of 0-5mm of the high-pressure roller mill S1002 is fed into the fine-grain dry separation machine, the fine-grain dry separation machine adopts a constant-quantity dry separation machine S1003, namely three products of concentrate, middling and tailings are subjected to dry separation, the middling yield is controlled by adjusting the position of a material distributing plate of the constant-quantity dry separation machine S1003, so that the middling yield is constant, the dry separation yield of the constant-quantity dry separation machine S1003 is 10000GS, the dry separation middling of the constant-quantity dry separation machine S1003 is returned to the high-pressure roller mill S1002 to form a closed circuit, the circulating load of the high-pressure roller mill S1002 is constant-quantity and 120%, the dry separation concentrate of, TiO 22The content of (A) is 5.08%, and the S content is 0.88%The recovery rate of Fe is 56.5 percent, and the recovery rate of TiO is2The recovery rate of the S recovery rate is 57.0 percent and the S recovery rate is 54.0 percent, the dry separation concentrate of the constant dry separation machine S1003 is fed into the iron separation sub-process S1100, the concentrate of the iron separation sub-process S1100 is iron concentrate, the yield of the iron concentrate is 12.78 percent, the Fe grade is 63.0 percent, and TiO is added into the iron separation sub-process S11002Has a content of 3.0%, an S content of 0.15%, a Fe recovery rate of 43.51%, and TiO2The recovery rate of (A) was 13.45% and the recovery rate of S was 3.69%;
the tailings yield of the iron beneficiation sub-process S1100 is 19.22%, the Fe grade is 12.51%, and TiO2The content of (A) is 6.44%, the S content is 1.36%, the recovery rate of Fe is 13.0%, and TiO2The recovery rate of the S is 43.55 percent and the S recovery rate is 50.31 percent, the tailings of the iron ore concentration subprocess S1100 are fed into a strong magnetic separation S1004, the magnetic field intensity of the strong magnetic separation S1004 is 4000GS, the concentrate yield of the strong magnetic separation S1004 is 15.20 percent, the Fe grade is 9.53 percent, and TiO is added into the concentrate2Has a content of 7.90%, an S content of 1.28%, a Fe recovery rate of 7.83%, and TiO2The recovery rate of the concentrated ore is 42.13 percent and the S recovery rate is 37.42 percent, the concentrated ore of the strong magnetic separation S1004 is fed into a first-stage shaking table S1005 for reselection, the middling of the first-stage shaking table S1005 is fed into a second-stage shaking table S1006 for reselection, the yield of the concentrated ore of the two-stage shaking table reselection is 13.38 percent, the Fe grade is 8.65 percent, and the TiO grade is 8.65 percent2The content of (A) is 8.50%, the S content is 1.20%, the recovery rate of Fe is 6.26%, and TiO2The recovery rate of (A) was 39.9% and the recovery rate of S was 31.0%;
feeding the concentrate reselected by the two-section table concentrator into a desulfurization rough flotation S1007, adding 200g/t of PH regulator sulfuric acid into the desulfurization rough flotation S1007, 100g/t of collecting agent butyl xanthate into the desulfurization rough flotation S1007, 20g/t of foaming agent 2# oil into the desulfurization rough flotation S1007, feeding the underflow concentrate into a desulfurization fine flotation S1008, adding 60g/t of collecting agent butyl xanthate into the desulfurization fine flotation S1008, and 10g/t of foaming agent 2# oil into the desulfurization fine flotation S1008, wherein the concentrate yield of the desulfurization fine flotation S1008 is 10.5 percent, the Fe grade is 6.88 percent, TiO is 10.5 percent, and the Fe grade is 6.88 percent2The content of (A) is 8.80%, the S content is 0.25%, the recovery rate of Fe is 3.9%, and TiO2The recovery rate of the S recovery rate is 39.5 percent and the S recovery rate is 5.05 percent, the foam tailings of the desulfurization rough flotation S1007 are fed into the desulfurization scavenging flotation S1009, and the tailings of the desulfurization fine flotation S1008 and the concentrate of the desulfurization scavenging flotation S1009 return to the desulfurization rough flotation S1007; feeding the concentrate of the desulfurization and fine flotation S1008 into a titanium floatS1200 is selected, the concentrate of the S1200 titanium flotation is titanium concentrate, the yield of the titanium concentrate is 2.07 percent, the Fe grade is 21.5 percent, and TiO is added2Has a content of 44.0%, an S content of 0.14%, a Fe recovery rate of 2.41%, and TiO2The recovery rate of (A) was 32.0% and the S recovery rate was 0.56%;
the dry tailings are formed by the large-granularity dry separation waste rocks of the three-stage crushing and large-granularity dry separation process S1001 and the tailings of the constant-volume dry separation machine S1003, and the dry tailings have the indexes of 68 percent of yield, 11.83 percent of Fe grade and TiO21.8 percent of (B), 0.35 percent of S, 43.50 percent of Fe recovery rate and TiO2The recovery rate of the dry tailings is 43.0 percent, the recovery rate of S is 46.0 percent, and the dry tailings are discarded; the tailings of the strong magnetic separation S1004, the tailings of the two-stage table reselection, the tailings of the desulfurization scavenging flotation S1009 and the tailings of the titanium flotation S1200 jointly form wet tailings, the yield of the wet tailings is 17.15%, the Fe grade is 11.42%, and TiO is added21.92% of (B), 1.51% of S, 10.59% of Fe recovery rate, TiO2The recovery rate of the wet tailings is 11.55 percent, the recovery rate of S is 49.76 percent, and the wet tailings are discarded.
The embodiment of fig. 1 realizes effective recovery of useful minerals through large-particle-size dry separation and fine-particle dry separation, and recovers most of magnetic titanomagnetite and ilmenite and pseudohematite with weak magnetism associated with the titanomagnetite through high field intensity of 10000GS while throwing off most of nonmagnetic waste rocks. The waste rock with the yield of 68 percent is removed through two-stage dry separation, the treatment capacity of subsequent ore grinding and sorting operations is greatly reduced, the energy consumption and the medium consumption are reduced, the cost is saved, and a foundation is laid for lower ore dressing cost and higher economic benefit. The closed circuit of the high-pressure roller mill and the dry separation of the fine particles is increased, the large dissociation of the nonmagnetic minerals and the magnetic minerals is greatly increased by adopting the superfine crushing effect of the high-pressure roller mill and the dry separation of the fine particles of 0-5mm, and conditions are created for the large-proportion tail flicking of the dry separation. The dry separation operation can adopt constant dry separation, so that the stable cyclic load of the high-pressure roller grinding operation is ensured, and favorable conditions are created for the stable operation of the high-pressure roller grinding operation. Adopts the technological process of strong magnetic separation and continuous two-stage shaking table. The strong magnetic drift tailing is adopted before the gravity separation, so that part of non-magnetite in the iron ore dressing tailings is removed, and a table concentrator is reducedThe ore amount of ore feeding is reduced, the equipment investment cost and the operation cost of a shaking table are saved, the ore dressing cost is reduced, and the TiO for gravity separation ore feeding is further improved2The content of (a). The titanium concentrating sub-process adopts the continuous two-section table concentrator gravity separation and desulfurization flotation process, adopts the titanium reselected by the table concentrator, fully utilizes the better selectivity of the table concentrator to fine particles with 0-200 meshes accounting for 90 percent, preliminarily improves the content of the titanium, and then removes most sulfides in table concentrator concentrate through desulfurization flotation, thereby avoiding the sulfides entering the titanium concentrate along with the ilmenite during the titanium flotation, polluting the titanium concentrate, leading the sulfur content of the obtained titanium concentrate to be 0.14 percent, and having particularly obvious sulfur reduction effect. By desulfurization flotation and titanium flotation, the yield is 2.07 percent, the Fe grade is 21.5 percent, and TiO is obtained2Has a content of 44.0%, an S content of 0.14%, a Fe recovery rate of 2.41%, and TiO2The recovery rate of the titanium concentrate is 32.0 percent, the S recovery rate of the titanium concentrate is 0.56 percent, the grade and the recovery rate of the titanium concentrate are high, and the whole beneficiation benefit is greatly improved by obtaining the part of the titanium concentrate.
As shown in fig. 2, the iron beneficiation sub-process flow of the optional embodiment of the titanomagnetite ilmenite beneficiation process, the iron beneficiation sub-process S1100 includes a closed circuit of a first-stage ball mill S1101 and a cyclone S1102, a closed circuit of a first-stage strong magnetic separation S1103, a closed circuit of a second-stage ball mill S1105 and a second-stage cyclone S1104, a weak magnetic separation S1106, a second-stage strong magnetic scavenging S1108, and a magnetic separation column S1107;
the constant dry separator S1003 is adopted by the fine dry separator, dry separation concentrate of the constant dry separator S1003 is fed into a first ball mill S1101 in a closed circuit with a cyclone S1102, ore is discharged from the first ball mill S1101 to the cyclone S1102, settled sand of the cyclone S1102 returns to the first ball mill S1101, 0-200-mesh overflow of the cyclone S1102 accounts for 60% and is fed into a first strong magnetic separation S1103, the magnetic field strength of the first strong magnetic separation S1103 is 8000GS, the concentrate yield of the first strong magnetic separation S1103 is 16.26%, the Fe grade is 55.3%, and TiO is 16.26%2The content of (A) is 7.70%, the S content is 0.40%, the recovery rate of Fe is 48.59%, and TiO2The recovery rate of the S recovery rate is 43.89 percent and the S recovery rate is 12.50 percent, the concentrate of the first-stage strong magnetic separation S1103 is fed into a second-stage cyclone in the closed circuit of a second-stage ball mill S1105 and a second-stage cyclone S1104S1104, feeding settled sand of the second-section cyclone S1104 into a second-section ball mill S1105, grinding the ore by the second-section ball mill S1105, returning the ore to the second-section cyclone S1104, feeding overflow of the second-section cyclone S1104, wherein the overflow accounts for 90% of the size of 0-200 meshes, into a low-intensity magnetic separation S1106, wherein the magnetic field intensity of the low-intensity magnetic separation S1106 is 2000GS, feeding tailings of the low-intensity magnetic separation S1106 into a second-section high-intensity magnetic separation S1108, and the magnetic field intensity of the second-section high-intensity magnetic separation S1108 is 6000 GS; feeding the concentrate of the low-intensity magnetic separation S1106 and the concentrate of the second-stage high-intensity magnetic scavenging S1108 into a magnetic separation column S1107, returning the tailings of the magnetic separation column S1107 to the low-intensity magnetic separation S1106, wherein the concentrate of the magnetic separation column S1107 is iron concentrate;
the tailings of the first section of strong magnetic separation S1103 and the tailings of the second section of strong magnetic scavenging S1108 are the tailings of the iron ore dressing subprocess S1100.
In the embodiment of fig. 2, the iron ore concentration sub-process adopts the processes of strong magnetic separation, weak magnetic separation, strong magnetic scavenging at the second section and a magnetic separation column, and the effective recovery of the magnetite and the artificial hematite of the ferromagnetic minerals after grinding is ensured through the high-field-intensity strong magnetic operation at the first section; and the second stage of strong magnetic scavenging with high field intensity ensures the effective recovery of the pseudolite hematite with weak magnetism in the tailings in weak magnetic selection. Effective recovery of the titanomagnetite is ensured through low-intensity magnetic separation; the comprehensive recovery of the magnetic separation recovery of the titanomagnetite and the gravity separation recovery of the artificial hematite is ensured through the comprehensive action of the magnetic separation and gravity separation of the magnetic column, and the quality of the iron ore concentrate is also ensured through the large-water-volume washing of the magnetic column. The magnetic separation method ensures that non-magnetic sulphide ore is not mixed in the magnetic separation concentrate, the sulphur content in the iron concentrate is 0.15 percent, and the method meets the strict requirements of domestic and foreign markets on the sulphur content. The magnetic field intensity of the first section of strong magnetic separation is 8000GS, the magnetic field intensity of the second section of strong magnetic separation is 6000GS, and the magnetic field intensity of the weak magnetic separation is 2000 GS. The magnetic separation field strength is gradually reduced from front to back, so that the nonmagnetic minerals are effectively and gradually released, the grade of the iron ore concentrate is continuously improved, and the quality of the iron ore concentrate is guaranteed. The indexes of the iron ore concentrate are that the yield is 12.78%, the Fe grade is 63.0%, and TiO2Has a content of 3.0%, an S content of 0.15%, a Fe recovery rate of 43.51%, and TiO2The recovery rate of the iron ore concentrate is 13.45 percent, the recovery rate of S is 3.69 percent, and the iron ore concentrate with higher grade is obtained.
A titanic flotation flow of an alternative embodiment of a titanomagnetite ilmenite beneficiation process shown in fig. 3, the titanic flotation S1200 comprising a titanic rougher flotation S1201, a titanic sweep flotation S1202 and four times of titanic concentrate flotation; the titanium flotation S1200 is direct flotation, the concentrate of the desulfurization fine flotation S1008 is fed into titanium rough flotation S1201, 2400g/t of pH regulator sulfuric acid is added into the titanium rough flotation S1201, 1500g/t of collecting agent oxidized paraffin soap and 50g/t of foaming agent methoxy polypropylene glycol are added into the titanium rough flotation S1201, the underflow tailings of the titanium rough flotation S1201 are fed into titanium scavenging flotation S1202, the foam concentrate of the titanium rough flotation S1201 is fed into first titanium fine flotation S1203, 120g/t of sulfuric acid is added into the first titanium fine flotation S1203, the concentrate of the first titanium fine flotation S1203 is fed into second titanium fine flotation S1204, 100g/t of sulfuric acid is added into the second titanium fine flotation S1204, the concentrate of the second titanium fine flotation S1204 is fed into third titanium fine flotation S1205, 80 g/t of sulfuric acid is added into the third titanium fine flotation S1205, and the concentrate of the third titanium fine flotation S1205 is fed into fourth titanium fine flotation S1206; adding 60g/t of sulfuric acid into 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;
and (3) tailings obtained in the titanium scavenging flotation S1202 are tailings of the titanium flotation S1200, and are classified into wet tailings discarding.
In the embodiment of fig. 3, the tailings in each section of titanium fine flotation in the titanium flotation are returned to the previous titanium fine flotation stage, and the time of one titanium fine flotation is increased for the tailings returned in each section of titanium fine flotation, so that the recovery rate of the titanium flotation is greatly increased.
The three-stage crushing and large-particle-size dry separation process generally comprises coarse crushing, large-particle-size dry separation, medium crushing and fine crushing, wherein a product of a raw ore after coarse crushing is subjected to large-particle-size dry separation, concentrate of the large-particle-size dry separation is subjected to medium crushing, a medium crushed product is subjected to fine crushing, and a fine crushed product is a crushed product; the large-particle-size dry separation waste rock forms one of the constituents of the dry tailings.
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 ilmenite beneficiation process for the titanomagnetite comprises three stages of crushing and large-granularity dry separation processes and is characterized in that: the method also comprises the closed circuit of the high-pressure roller mill and a fine particle dry separator, an iron ore dressing sub-process, strong magnetic separation, two-stage table shaking, desulfurization rough flotation, desulfurization scavenging flotation, desulfurization fine flotation and titanium flotation; the iron ore separation sub-process comprises a first section of ball milling and cyclone closed circuit, a first section of strong magnetic separation, a second section of ball milling and second section of cyclone closed circuit, a weak magnetic separation, a second section of strong magnetic scavenging and a magnetic separation column;
after raw ore is subjected to three-section crushing and large-granularity dry separation procedures, feeding crushed products with the granularity of 0-20mm into a high-pressure roller mill in a closed circuit with a fine particle dry separation machine, feeding products with the granularity of 0-5mm of the high-pressure roller mill into the fine particle dry separation machine, returning dry separation medium ores of the fine particle dry separation machine to the high-pressure roller mill to form a closed circuit, feeding dry separation concentrate of the fine particle dry separation machine into a first section ball mill in the closed circuit of a first section ball mill and a cyclone, discharging ore from the first section ball mill to the cyclone, returning settled sand of the cyclone to the first section ball mill, feeding 0-200 meshes of 60% of overflow of the cyclone into a first section strong magnetic separation, feeding concentrate of the first section strong magnetic separation into a second section ball mill in a second section cyclone in the closed circuit of the second section, feeding settled sand of the second section ball mill into the second section ball mill, returning to the second section after the second section ball mill, feeding 0-200 meshes of the second section cyclone into, feeding the tailings subjected to low-intensity magnetic separation into a second section of high-intensity magnetic scavenging, feeding the concentrate subjected to low-intensity magnetic separation and the concentrate subjected to second section of high-intensity magnetic scavenging into a magnetic separation column, returning the tailings of the magnetic separation column to low-intensity magnetic separation, and taking the concentrate of the magnetic separation column as iron concentrate;
the tailings of the first section of strong magnetic separation and the tailings of the second section of strong magnetic scavenging form tailings of an iron ore dressing sub process, the tailings of the iron ore dressing sub process are subjected to strong magnetic separation, concentrate subjected to strong magnetic separation is subjected to first section of table concentrator for gravity separation, and middlings subjected to first section of table concentrator gravity separation are subjected to 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 large-granularity dry separation waste rocks of the three-section crushing and large-granularity dry separation process and the tailings of the fine-particle dry separation machine form dry tailings discarding tailings; the tailings subjected to strong magnetic separation, the tailings subjected to two-stage table reselection, the tailings subjected to desulfurization and scavenging flotation and the tailings subjected to titanium flotation jointly form wet tailings discarding.
2. The titanomagnetite ilmenite beneficiation process according to claim 1, characterized by: 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 are classified into wet tailings discarding.
3. The titanomagnetite ilmenite beneficiation process according to claim 1, characterized by: the magnetic field intensity of the fine particle dry separation machine is 9000-11000 GS; the magnetic field intensity of the strong magnetic separation is 3600-.
4. The titanomagnetite ilmenite beneficiation process according to claim 1, characterized by: the magnetic field intensity of the first-stage strong magnetic separation is 7200-6600 GS, the magnetic field intensity of the second-stage strong magnetic separation is 5500-6600GS, and the magnetic field intensity of the low magnetic separation is 1800-2200 GS.
5. The titanomagnetite ilmenite beneficiation process according to claim 1, characterized by: the constant dry separator is used for dry separation of three products of concentrate, middling and tailings, and controls the middling yield by adjusting the position of a material distributing plate of the constant dry separator, so that the middling yield is kept constant.
6. The titanomagnetite ilmenite beneficiation process according to claim 1, characterized by: 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 feeding.
7. The titanomagnetite ilmenite beneficiation process according to 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 titanomagnetite ilmenite beneficiation process according to 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, 72-88 g 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 titanomagnetite ilmenite beneficiation process according to any one of claims 1 to 8, characterized in that: the useful minerals of the raw ore are mainlyThe components are titanomagnetite, ilmenite and artificial hematite, and the gangue minerals of the raw ore mainly comprise amphibole, pyroxene, plagioclase, pyrite and chalcopyrite; fe grade of 18.50% and TiO2The raw ore with the content of 2.85 percent and the sulfur content of 0.52 percent is processed by the ilmenite beneficiation process of titanomagnetite as claimed in any one of claims 1 to 8 to obtain the ilmenite with the Fe grade of 63.0 percent and the TiO grade2Has a content of 3.0%, an S content of 0.15%, a Fe recovery rate of 43.51%, and TiO2The recovery rate of the iron ore concentrate is 13.45 percent, the recovery rate of S is 3.69 percent, the grade of Fe is 21.5 percent, and TiO2Has a content of 44.0%, an S content of 0.14%, a Fe recovery rate of 2.41%, and TiO2The recovery rate of (a) was 32.0% and the S recovery rate was 0.56% of the titanium concentrate.
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| CN111389583A (en) * | 2020-03-06 | 2020-07-10 | 长沙矿冶研究院有限责任公司 | Beneficiation method for enhancing separation efficiency of placer type ilmenite |
| CN112076891B (en) * | 2020-08-26 | 2022-09-27 | 长沙矿冶研究院有限责任公司 | Method for extracting titanium and reducing impurities from iron ore dressing tailings of vanadium titano-magnetite |
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