Iron-titanium separation method and iron-titanium separation system for micron-sized ilmenite

Abstract

The invention relates to the field of mineral separation, in particular to an iron-titanium separation method and system for micron-sized ilmenite, the iron-titanium separation method for the micron-sized ilmenite separates feeding ore pulp in a multi-stage separation mode, and the specific separation links include roughing, scavenging, first-stage concentration and second-stage concentration. The ore pulp is separated and extracted, finally, concentrate with the higher titanium metal content proportion is obtained through separation, meanwhile, the concentrate and tailings obtained in the separation process are subjected to circulating separation in the mode of returning to the upper stage or returning in an override mode or returning in a cross mode, and the situation that titanium metal which is not separated from the ore pulp is discarded as tailings, and huge loss of the metal amount is caused is avoided; the concentrate and the tailings obtained in each separation link are separated for multiple times, so that the separation effect and the recovery rate of the method on the titanium iron ore are improved.

Description

[Technical field]

[0001] The invention relates to the field of mineral separation, and in particular to an iron-titanium separation method and an iron-titanium separation system for micron-grade ilmenite. [Background technology]

[0002] my country has large reserves of ilmenite resources, but more than 90% of ilmenite ore types are paragenetic rocks that are difficult to mine. They are not only complex in composition, but also have low TiO2 grades, making ore sorting difficult. For the sorting of ilmenite ore, the existing sorting methods mainly include gravity sorting, magnetic separation, flotation, grinding-flotation combined process and chemical sorting. When selecting a specific sorting method, it is necessary to comprehensively consider factors such as ore characteristics, particle size range, and economic benefits to achieve the best sorting effect and resource recovery rate.

[0003] In recent years, as the development of mining resources has entered the deep mining stage, the resources of high-quality raw ore have been significantly reduced. The characteristics of existing ores are: fine particle size, mixed associated minerals, low grade, and high difficulty in sorting. In order to ensure the sorting indicators, the beneficiation plant has to finely grind the mined raw ore, which leads to a wider particle size distribution range of the selected minerals, and a significant increase in the content of micron-sized mineral particles, especially the content of fine particles less than 45 microns, which gradually increases the difficulty of sorting. The excessive particle size of the ore will make it easy for fine-grained minerals to be doped during the sorting process, resulting in a decrease in sorting efficiency, resulting in the failure to fully separate the effective components, and the possibility of adhesion between fine minerals, resulting in a decrease in dissociation degree, affecting the subsequent sorting effect. In actual production, with the current ilmenite beneficiation technology and equipment, the grade of the tailings after sorting is relatively high, mainly because the fine particles less than 45 microns are not effectively sorted and directly enter the tailings, making TiO 2 The recovery of the minerals is not sufficient. This part of the minerals is discarded as sludge, resulting in a huge loss of metal content. [Summary of the invention]

[0004] In order to solve the problem of low recovery rate of current ilmenite ore sorting, the present invention provides a method for separating iron and titanium from micron-sized ilmenite, and the method for separating iron and titanium from micron-sized ilmenite comprises the following steps:

[0005] Providing a feed slurry containing micron-sized ilmenite particles, and subjecting the provided feed slurry to roughing through a roughing device to obtain a roughing concentrate and a roughing tailing;

[0006] The rougher tailings are scavenged by scavenging equipment to obtain scavenged concentrate and scavenged tailings, and it is determined whether to return the scavenged concentrate for re-roughing according to the sorting index;

[0007] The obtained rougher concentrate is subjected to a primary concentration by a primary concentration device to obtain a primary concentrated concentrate and a primary concentrated tailings. According to the sorting index, it is determined whether to return the primary concentrated tailings for re-roughing or scavenging to obtain the concentrate after sorting.

[0008] Preferably, the primary concentrated concentrate is subjected to secondary concentration by secondary concentration equipment to obtain secondary concentrated concentrate and secondary concentrated tailings. It is determined according to the sorting index whether to return the secondary concentrated tailings for re-roughing, scavenging or primary concentration to obtain the concentrate after sorting.

[0009] Preferably, flotation reagents are added during the roughing, scavenging, primary cleaning and secondary cleaning processes.

[0010] Preferably, the feed slurry includes a flotation agent and a raw material slurry, and the flotation agent and the raw material slurry are uniformly mixed through a stirring barrel.

[0011] Preferably, the roughing equipment, scavenging equipment, primary concentrating equipment and secondary concentrating equipment are all provided with flotation columns, and the concentrate and tailings in the ore pulp are separated by the flotation columns.

[0012] Preferably, the flotation reagent is delivered to the working link by setting a dosing point in the roughing flotation column, the scavenging flotation column, the primary concentrating flotation column and the secondary concentrating flotation column.

[0013] Preferably, the content of ilmenite particles with a particle size of less than 45 microns in the feed slurry accounts for no less than 50% of the total ilmenite particles, the TiO2 grade in the feed slurry is no less than 13%, and the feed slurry concentration is 30-50%.

[0014] Preferably, the sorting index is that the TiO2 grade in the ore pulp is not less than 46%, and the TiO2 recovery rate is not less than 85%.

[0015] Preferably, the flotation reagent includes a collector, a frother and sulfuric acid, the amount of the collector is 7000-9000g\t, the amount of the frother is 200-400g\t, and the amount of sulfuric acid is 30000-40000g\t.

[0016] In order to solve the above technical problems, the present invention also provides an iron-titanium separation system, which comprises:

[0017] A roughing module is used to provide a feed slurry containing micron-sized ilmenite particles, and to perform roughing on the provided feed slurry through a roughing device to obtain a roughing concentrate and a roughing tailing;

[0018] The scavenging module is used to scavenging the rougher tailings through scavenging equipment to obtain scavenging concentrates and scavenging tailings, and to determine whether to return the scavenging concentrates for re-roughing according to the sorting index;

[0019] The primary concentration module is used to perform primary concentration on the obtained roughing concentrate through the primary concentration equipment to obtain primary concentrated concentrate and primary concentrated tailings. According to the sorting index, it is determined whether to return the primary concentrated tailings for re-roughing or scavenging to obtain the concentrate after sorting.

[0020] Compared with the prior art, the iron-titanium separation method and iron-titanium separation system of micron-grade ilmenite of the present invention have the following advantages:

[0021] 1. The iron-titanium separation method of micron-sized ilmenite provided by the present invention separates the feed slurry by a multi-stage separation method, thereby obtaining a concentrate with a higher titanium content and a tailing with a relatively lower content; the specific separation steps include roughing, scavenging and primary concentration, and the feed slurry is preliminarily sorted by roughing to obtain a roughing concentrate and a roughing tailing; the roughing tailing is further sorted by scavenging to obtain a scavenging concentrate and a scavenging tailing, and the concentrate that is not effectively separated from the roughing tailing is obtained, and this part of the scavenging concentrate is returned for re-roughing, thereby avoiding the titanium metal that is not separated from the slurry from being discarded as tailings, resulting in a huge loss of metal content;

[0022] At the same time, the obtained rougher concentrate is subjected to a primary concentration to further increase the proportion of titanium metal content in the concentrate, and a primary concentrated concentrate and a primary concentrated tailings are obtained by sorting. The sorted primary concentrated tailings are returned for re-roughing or scavenging, and the primary concentrated tailings are sorted again to avoid incomplete sorting of titanium metal in the primary concentrated tailings. After multiple sorting, a concentrate product that meets the standards is finally obtained; by sorting the tailings obtained in each sorting link multiple times, the sorting effect and recovery rate of ilmenite ore by this method are improved.

[0023] 2. The present invention provides an iron-titanium separation method for micron-sized ilmenite, which also includes subjecting the obtained primary concentrated concentrate to secondary concentration, to obtain secondary concentrated concentrate and secondary concentrated tailings. The primary concentrated concentrate subjected to secondary concentration usually contains relatively pure useful minerals and some residual impurities, the particle size of the ore particles is finer, and the types of minerals are fewer. Its main purpose is to further improve the purity of the product, remove the remaining impurities, obtain a concentrate with a higher proportion of titanium metal content, and improve the quality of the final concentrate; at the same time, the obtained secondary concentrated tailings are returned for re-roughing, scavenging or primary concentration, and the titanium metal in the tailings can be further filtered and sorted out, thereby improving the recovery rate of the titanium metal.

[0024] 3. In the iron-titanium separation method of micron-sized ilmenite provided by the present invention, flotation agents are added in the roughing, scavenging, primary concentration and secondary concentration processes. By adding appropriate flotation agents to the slurry, the flotation selectivity of ilmenite and impurity minerals is improved, so that the ilmenite particles can be separated and processed from the slurry, thereby improving the separation effect of titanium metal.

[0025] 4. In the iron-titanium separation method of micron-sized ilmenite provided by the present invention, the feed slurry includes a flotation agent and a raw slurry. The raw slurry is prepared by crushing and grinding the ilmenite ore and mixing it with water and chemical reagents. The flotation agent and the raw slurry are evenly mixed by a stirring barrel so that the ilmenite particles in the raw slurry and the flotation agent can fully contact each other, thereby improving the separation recovery rate of the slurry.

[0026] 5. In the iron-titanium separation method of micron-grade ilmenite provided by the present invention, the roughing equipment, scavenging equipment, primary concentrating equipment and secondary concentrating equipment are all equipped with flotation columns, and the concentrate and tailings in the ore pulp are separated by the flotation columns. The flotation columns have high particle separation efficiency, low energy consumption, and simple operation, and are more suitable for processing ore pulp with finer ore particles.

[0027] 6. The iron-titanium separation method of micron-sized ilmenite provided by the present invention provides dosing points in the roughing flotation column, the scavenging flotation column, the primary concentrating flotation column and the secondary concentrating flotation column to deliver the flotation agent to the working link. The flotation agent can be delivered to the ore pulp to be sorted in time through the dosing points, thereby improving the sorting efficiency. At the same time, the content of the flotation agent can be effectively controlled during the dynamic consumption of the flotation agent to meet the different flotation agent contents required in different links, thereby improving the utilization rate of the flotation agent and reducing the sorting cost.

[0028] 7. In the iron-titanium separation method of micron-sized ilmenite provided by the present invention, the content of ilmenite particles with a particle size of less than 45 microns in the feed slurry accounts for not less than 50% of the total ilmenite particles, the TiO2 grade in the feed slurry is not less than 13%, and the feed slurry concentration is 30-50%. Since the present method has a better sorting effect on small particles, by selecting a feed slurry with smaller ilmenite particles and a higher content, the sorting efficiency of the present method during the sorting process and the utilization rate of raw materials and equipment are improved.

[0029] 8. In the iron-titanium sorting method for micron-sized ilmenite provided by the present invention, the sorting indicators are that the TiO2 grade in the slurry is not less than 46%, and the TiO2 recovery rate is not less than 85%. The slurry after sorting includes concentrate and tailings. By setting the sorting indicators, it is determined whether the concentrate or tailings needs to be sorted again, and the slurry that does not meet the standards is sorted again, thereby improving the recovery rate of titanium metal and controlling the number of multiple sortings.

[0030] 9. In the iron-titanium separation method of micron-sized ilmenite provided by the present invention, the flotation agents include collectors, frothers and sulfuric acid. The flotation agents promote the separation and flotation of minerals by changing the properties of the surface of ilmenite particles. The collector makes the surface of ilmenite particles hydrophilic so that it can combine with bubbles and float to the liquid surface. The frother generates and stabilizes bubbles to help mineral flotation and adjust the pH of the slurry during the flotation process. Sulfuric acid is used to optimize the effectiveness of the agents and the flotation effect of the minerals.

[0031] 10. The present invention also provides an iron-titanium separation system, which has the same beneficial effects as the above-mentioned iron-titanium separation method of micron-grade ilmenite, and will not be described in detail here.

Brief Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 It is a flow chart of the steps of a method for separating iron and titanium from micron-sized ilmenite provided in the first embodiment of the present invention.

[0034] Figure 2 The first embodiment of the present invention provides a method for separating iron and titanium from micron-sized ilmenite. Figure 1 .

[0035] Figure 3 The first embodiment of the present invention provides a method for separating iron and titanium from micron-sized ilmenite. Figure 2 .

[0036] Figure 4 The first embodiment of the present invention provides a method for separating iron and titanium from micron-sized ilmenite. Figure 3 .

[0037] Figure 5 The first embodiment of the present invention provides a method for separating iron and titanium from micron-sized ilmenite. Figure 4 .

[0038] Figure 6 It is a structural diagram of an iron-titanium separation system provided in the second embodiment of the present invention.

[0039] Description of the accompanying drawings:

[0040] 1. Iron and titanium separation system;

[0041] 101. Rough selection module; 102. Scanning selection module; 103. Primary selection module; 104. Secondary selection module. [Specific implementation method]

[0042] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] To solve the current problem of low recovery rate of ilmenite ore sorting, please refer to Figure 1 The first embodiment of the present invention provides a method for separating iron and titanium from micron-sized ilmenite, comprising the following steps:

[0044] S1: providing a feed slurry containing micron-sized ilmenite particles, and subjecting the provided feed slurry to roughing through a roughing device to obtain a roughing concentrate and a roughing tailing;

[0045] S2: The obtained rougher tailings are scavenged by scavenging equipment to obtain scavenged concentrate and scavenged tailings, and it is determined whether to return the scavenged concentrate for re-roughing according to the sorting index;

[0046] S3: The obtained rougher concentrate is subjected to a primary concentration device for primary concentration to obtain a primary concentrated concentrate and a primary concentrated tailings. According to the sorting index, it is determined whether to return the primary concentrated tailings for re-roughing or scavenging to obtain a concentrate after sorting.

[0047] The method separates the feed slurry by multi-stage sorting, thereby obtaining a concentrate with a higher titanium content and a tailing with a relatively lower content; the specific sorting steps include roughing, scavenging and primary concentration, and the feed slurry is preliminarily sorted by roughing to obtain a roughing concentrate and a roughing tailing; the roughing tailing is further sorted by scavenging to obtain a scavenging concentrate and a scavenging tailing, and the concentrate that is not effectively separated from the roughing tailing is obtained, and this part of the scavenging concentrate is returned for re-roughing, thereby avoiding the titanium metal that is not sorted out of the slurry from being discarded as tailings, resulting in a huge loss of metal content;

[0048] At the same time, the obtained rougher concentrate is subjected to a primary concentration to further increase the proportion of titanium metal content in the concentrate, and a primary concentrated concentrate and a primary concentrated tailings are obtained by sorting. The sorted primary concentrated tailings are returned for re-roughing or scavenging, and the primary concentrated tailings are sorted again to avoid incomplete sorting of titanium metal in the primary concentrated tailings. After multiple sorting, a concentrate product that meets the standards is finally obtained; by sorting the tailings obtained in each sorting link multiple times, the sorting effect and recovery rate of ilmenite ore by this method are improved.

[0049] Specifically, in the roughing stage, the feed slurry is fed into the roughing equipment, and flotation reagents are added. Through the generation of bubbles, the target minerals are attached to the bubbles and float to the liquid surface, forming flotation foam. The flotation foam contains most of the valuable minerals, while the unattached minerals sink to the bottom of the tank and are discharged as tailings. Roughing usually handles larger particles of ore and separates them quickly with a lower recovery rate.

[0050] In the scavenging stage, the froth after roughing is usually floated again to recover the remaining target minerals. The focus of this process is to improve the purity and quality of the flotation froth. Scavenging usually uses lower reagent concentrations and mild operating conditions to reduce the loss of recovered minerals and ensure that as many lost target minerals as possible are recovered.

[0051] In the primary concentration stage, the scavenging product is further processed to improve the purity and grade of the mineral. If some concentrates of the target mineral have been obtained in the roughing and scavenging stages, the concentration is aimed at removing the final impurities to ensure the quality of the final product. During the concentration process, the flotation reagents and operating parameters may be adjusted according to the different characteristics of the minerals to achieve the best separation effect.

[0052] Specifically, see Figure 2 , returning the scavenged concentrate obtained by scavenging to the roughing equipment for re-roughing to obtain new roughing concentrate and roughing tailings; further, returning the primary concentrated tailings obtained by the primary concentrating of the roughing concentrate to re-roughing to obtain new roughing concentrate and roughing tailings;

[0053] Optionally, see Figure 5 The first concentrated tailings obtained from the roughing concentrate through the first concentration are returned for re-scavenging to obtain new scavenging concentrate and scavenging tailings. The scavenging concentrate shells are circulated back to the roughing equipment for re-roughing to obtain new roughing concentrate and roughing tailings. The sorting index is used to determine whether to end the cycle according to the proportion of titanium metal content in the concentrate and tailings, and finally a first concentrated concentrate after the first concentration is obtained.

[0054] Optionally, the concentrate and tailings obtained by sorting exist in the form of slurry, and the sorting index is the TiO 2 The grade is not less than 46%, TiO 2 The recovery rate is not less than 85%. The titanium compounds in ilmenite are mainly TiO 2 By setting the sorting index, it is determined whether the concentrate or tailings need to be sorted again, and the slurry that does not meet the standard is sorted again, thereby improving the recovery rate of titanium metal and controlling the number of multiple sortings.

[0055] Understandably, see Figure 1 The iron-titanium separation method of micron-sized ilmenite also includes step S4: subjecting the obtained primary concentrated concentrate to secondary concentration through secondary concentration equipment to obtain secondary concentrated concentrate and secondary concentrated tailings, and judging whether to return the secondary concentrated tailings for re-roughing, scavenging or primary concentration according to the sorting index to obtain the concentrate after sorting.

[0056] The main goal of primary concentration is to initially separate useful minerals such as ilmenite from the slurry. At this stage, most of the valuable minerals are usually separated from waste (such as gangue and impurities). The primary concentrate treated by secondary concentration usually contains relatively pure useful minerals and some residual impurities. The particle size of the ore particles is finer and the types of minerals are fewer. Its main purpose is to further improve the purity of the product, remove the remaining impurities, obtain a concentrate with a higher proportion of titanium metal content, and improve the quality of the final concentrate; at the same time, the secondary concentrated tailings are returned for re-roughing, scavenging or primary concentration, which can further filter and sort out the titanium metal in the tailings and improve the recovery rate of titanium metal.

[0057] Specifically, see Figure 4 The secondary concentrated tailings obtained through the secondary concentration are returned to the roughing equipment for roughing to obtain new roughing concentrate and roughing tailings, and primary concentration and secondary concentration are carried out again to finally obtain secondary concentrated concentrate.

[0058] Optionally, see Figure 3 The secondary concentrated tailings obtained through the secondary concentration are returned to the primary concentration equipment for primary concentration to obtain new primary concentrated concentrate and primary concentrated tailings, and then secondary concentration is carried out again to obtain secondary concentrated concentrate.

[0059] Furthermore, the roughing equipment, scavenging equipment, primary concentrating equipment and secondary concentrating equipment are all provided with flotation columns, through which the concentrate and tailings in the ore pulp are separated, and the concentrate is discharged from the top of the flotation column and the tailings are discharged from the bottom.

[0060] Flotation columns can provide longer contact time, allowing minerals to come into contact with bubbles more fully, thereby improving separation efficiency. At the same time, the design of flotation columns allows for fine control of bubble size and distribution within the column, which helps to selectively separate target minerals from impurities. During operation, flotation columns can usually effectively reduce the amount of flotation reagents used, reducing production costs. The operation of flotation columns is also relatively stable and is relatively less susceptible to changes in slurry properties, maintaining consistent flotation performance. Secondly, flotation columns can handle a variety of slurries, including fine particles and difficult-to-float minerals, and have a wide range of adaptability. Flotation columns have high particle separation efficiency, low energy consumption, and easy operation, and are more suitable for processing slurries with finer particles.

[0061] Furthermore, the top of the flotation column is equipped with a gas distribution system, which usually uses air or inert gas to generate fine bubbles. When the slurry passes through the flotation column, the fine bubbles rise and combine with the ilmenite particles in the slurry, making the mineral surface hydrophobic. The ilmenite particles rise to the top of the flotation column under the buoyancy of the bubbles, while the unattached minerals settle to the bottom, so that the concentrate can be discharged from the top of the flotation column and the tailings can be discharged from the bottom.

[0062] Specifically, the first concentration is carried out through the flotation column for primary flotation, and the first sorting separates a large amount of ilmenite through bubble flotation; the second concentration is carried out through the flotation column for secondary flotation, and the second flotation is to further improve the purity and recovery rate. Multiple sorting can significantly improve the quality of the product and effectively remove impurities.

[0063] It can be understood that the feed slurry includes flotation reagents and raw slurry. Before using the flotation column, it is necessary to first adjust the slurry and add reagents. After the ilmenite ore is crushed and ground, it is mixed with water and chemical reagents to form a raw slurry. The particle size control of grinding is the key to ensuring flotation efficiency; then add appropriate flotation reagents to the slurry to improve the flotation selectivity of titanium ore and impurity minerals; finally, the flotation reagents and the raw slurry are evenly mixed through a stirring barrel. The flotation reagents and the raw slurry are evenly mixed through a stirring barrel so that the ilmenite particles in the raw slurry and the flotation reagents can fully contact, thereby improving the separation recovery rate of the slurry.

[0064] Furthermore, the content of ilmenite particles with a particle size of less than 45 microns in the feed slurry is not less than 50% of the total ilmenite particles, and the content of TiO 2 The grade is not less than 13%, and the feed slurry concentration is 30-50%.

[0065] Since the method is more suitable for the sorting of small-particle minerals, the sorting efficiency of the method and the utilization rate of raw materials and equipment in the sorting process are improved by selecting a feed slurry with smaller ilmenite particles and a higher content.

[0066] It should be noted that as the development of mining resources enters deep mining, the resources of high-quality raw ore have been significantly reduced. The characteristics of existing ores are: fine particle size, mixed associated minerals, low grade, and high difficulty in sorting. In order to ensure the sorting index, the beneficiation plant has to finely grind the mined raw ore, which leads to a wider particle size distribution range of the selected minerals and a significant increase in the content of micron-sized mineral particles, especially the gradual increase in the content of fine particles less than 45 microns, which further increases the difficulty of sorting.

[0067] Understandably, see Figure 3 Flotation reagents are added in the roughing, scavenging, primary cleaning and secondary cleaning processes. Flotation reagents play a key role in the mineral flotation process. They promote the separation and flotation of minerals by changing the properties of the mineral surface. By adding appropriate flotation reagents to the slurry to improve the flotation selectivity of ilmenite and impurity minerals, ilmenite particles can be separated from the slurry, thereby improving the separation effect of titanium metal.

[0068] Specifically, flotation reagents may include collectors, inhibitors, frothers, pH regulators, additives and chelating agents, etc., and one or more different combinations of flotation reagents may be selected for use in different stages; wherein the collector makes the surface of ilmenite particles hydrophilic so that it can combine with bubbles and float to the liquid surface; the inhibitor inhibits the flotation of some minerals and prevents them from combining with bubbles to improve the selectivity of the desired minerals; the frother generates and stabilizes bubbles, helps the flotation of minerals, and adjusts the pH value of the pulp during the flotation process; the pH regulator is used to optimize the efficacy of the reagent and the flotation effect of the mineral; the additive improves the effect of the reagent or enters the pulp to improve the flotation performance of the mineral; the chelating agent forms a complex with specific metal ions to affect their flotation behavior.

[0069] As a feasible implementation method, the flotation reagent includes a collector, a frother and sulfuric acid. The amount of the collector is 7000-9000g\t, the amount of the frother is 200-400g\t, and the amount of sulfuric acid (PH regulator) is 30000-40000g\t.

[0070] It can be understood that by setting dosing points in the roughing flotation column, the scavenging flotation column, the primary concentrating flotation column and the secondary concentrating flotation column, the flotation reagent is delivered to the working link. The flotation reagent can be delivered to the ore pulp to be sorted in time through the dosing points, which improves the sorting efficiency. At the same time, the content of the flotation reagent can be effectively controlled during the dynamic consumption of the flotation reagent to meet the different flotation reagent contents required in different links, improve the utilization rate of the flotation reagent, and reduce the sorting cost.

[0071] It should be noted that primary concentration focuses more on overall recovery and separation, and the output is mainly coarse concentrate, which contains a high proportion of target minerals, but the impurity content is relatively high; while secondary concentration focuses on fine processing, and the output is a higher purity concentrate with significantly reduced impurity content, thereby increasing the value of the product. Therefore, primary concentration generally uses more flotation reagents to ensure that the main minerals are fully floated, and usually larger bubbles are selected with a relatively large flow rate to improve the attachment and separation efficiency of heavy minerals; the amount of flotation reagents used in secondary concentration is generally less, the purpose is to selectively float specific impurities, and the bubbles are usually smaller to increase the surface area and provide better selectivity and flotation efficiency.

[0072] The iron-titanium separation method of micron-sized ilmenite provided in the present embodiment separates the input slurry by means of a multi-stage separation method. The specific separation steps include roughing separation, scavenging separation, primary concentration and secondary concentration. The slurry is separated and extracted and finally sorted to obtain a concentrate with a higher titanium metal content. At the same time, in the separation process, the concentrate and tailings are returned to the previous level, returned across levels or cross-returned for cyclic separation, thereby avoiding the titanium metal that has not been separated from the slurry from being discarded as tailings, resulting in a huge loss of metal content. By multiple sorting of the concentrate and tailings obtained in each separation link, the separation effect and recovery rate of the ilmenite ore of the present method are improved.

[0073] To solve the above technical problems, please refer to Figure 6 The present invention also provides an iron-titanium separation system 1, which comprises:

[0074] A roughing module 101 is used to provide a feed slurry containing micron-sized ilmenite particles, and to perform roughing on the provided feed slurry through a roughing device to obtain a roughing concentrate and a roughing tailing;

[0075] The scavenging module 102 is used to scavenging the obtained rougher tailings through scavenging equipment to obtain scavenged concentrates and scavenged tailings, and determine whether to return the scavenged concentrates for re-roughing according to the sorting index;

[0076] The primary concentration module 103 is used to perform primary concentration on the obtained roughing concentrate through the primary concentration equipment to obtain primary concentrated concentrate and primary concentrated tailings, and determine whether to return the primary concentrated tailings for re-roughing or scavenging according to the sorting index to obtain the concentrate after sorting.

[0077] Specifically, an iron-titanium sorting system 1 also includes a secondary concentration module 104, which performs secondary concentration on the obtained primary concentrated ore through secondary concentration equipment to obtain secondary concentrated ore and secondary concentrated tailings, and determines whether to return the secondary concentrated tailings for re-roughing, scavenging or primary concentration according to the sorting index to obtain the concentrate after the sorting is completed.

[0078] In the embodiments provided by the present invention, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0079] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0080] In various embodiments of the present invention, it should be understood that the size of the serial numbers of the above-mentioned processes does not mean the necessary order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0081] Compared with the prior art, the iron-titanium separation method of micron-sized ilmenite of the present invention has the following advantages:

[0082] 1. The iron-titanium separation method of micron-sized ilmenite provided by the present invention separates the feed slurry by a multi-stage separation method, thereby obtaining a concentrate with a higher titanium content and a tailing with a relatively lower content; the specific separation steps include roughing, scavenging and primary concentration, and the feed slurry is preliminarily sorted by roughing to obtain a roughing concentrate and a roughing tailing; the roughing tailing is further sorted by scavenging to obtain a scavenging concentrate and a scavenging tailing, and the concentrate that is not effectively separated from the roughing tailing is obtained, and this part of the scavenging concentrate is returned for re-roughing, thereby avoiding the titanium metal that is not separated from the slurry from being discarded as tailings, resulting in a huge loss of metal content;

[0083] At the same time, the obtained rougher concentrate is subjected to a primary concentration to further increase the proportion of titanium metal content in the concentrate, and a primary concentrated concentrate and a primary concentrated tailings are obtained by sorting. The sorted primary concentrated tailings are returned for re-roughing or scavenging, and the primary concentrated tailings are sorted again to avoid incomplete sorting of titanium metal in the primary concentrated tailings. After multiple sorting, a concentrate product that meets the standards is finally obtained; by sorting the tailings obtained in each sorting link multiple times, the sorting effect and recovery rate of ilmenite ore by this method are improved.

[0084] 2. The iron-titanium separation method of micron-sized ilmenite provided by the present invention also includes secondary concentration of the obtained primary concentrated concentrate, and secondary concentrated concentrate and secondary concentrated tailings are obtained through secondary concentration. The primary concentrated concentrate treated with secondary concentration usually contains relatively pure useful minerals and some residual impurities, the particle size of the ore particles is finer, and the types of minerals are fewer. Its main purpose is to further improve the purity of the product, remove the remaining impurities, obtain a concentrate with a higher proportion of titanium metal content, and improve the quality of the final concentrate; at the same time, the secondary concentrated tailings are returned for re-roughing, scavenging or primary concentration, and the titanium metal in the tailings can be further filtered and sorted out, thereby improving the recovery rate of titanium metal.

[0085] 3. In the iron-titanium separation method of micron-sized ilmenite provided by the present invention, flotation agents are added in the roughing, scavenging, primary concentration and secondary concentration processes. By adding appropriate flotation agents to the slurry, the flotation selectivity of ilmenite and impurity minerals is improved, so that the ilmenite particles can be separated and processed from the slurry, thereby improving the separation effect of titanium metal.

[0086] 4. In the iron-titanium separation method of micron-sized ilmenite provided by the present invention, the feed slurry includes a flotation agent and a raw slurry. The raw slurry is prepared by crushing and grinding the ilmenite ore and mixing it with water and chemical reagents. The flotation agent and the raw slurry are evenly mixed by a stirring barrel so that the ilmenite particles in the raw slurry and the flotation agent can fully contact each other, thereby improving the separation recovery rate of the slurry.

[0087] 5. In the iron-titanium separation method of micron-grade ilmenite provided by the present invention, the roughing equipment, scavenging equipment, primary concentrating equipment and secondary concentrating equipment are all equipped with flotation columns, and the concentrate and tailings in the ore pulp are separated by the flotation columns. The flotation columns have high particle separation efficiency, low energy consumption, and simple operation, and are more suitable for processing ore pulp with finer ore particles.

[0088] 6. The iron-titanium separation method of micron-sized ilmenite provided by the present invention provides dosing points in the roughing flotation column, the scavenging flotation column, the primary concentrating flotation column and the secondary concentrating flotation column to deliver the flotation agent to the working link. The flotation agent can be delivered to the ore pulp to be sorted in time through the dosing points, thereby improving the sorting efficiency. At the same time, the content of the flotation agent can be effectively controlled during the dynamic consumption of the flotation agent to meet the different flotation agent contents required in different links, thereby improving the utilization rate of the flotation agent and reducing the sorting cost.

[0089] 7. In the iron-titanium separation method of micron-sized ilmenite provided by the present invention, the content of ilmenite particles with a particle size of less than 45 microns in the feed slurry accounts for not less than 50% of the total ilmenite particles, the TiO2 grade in the feed slurry is not less than 13%, and the feed slurry concentration is 30-50%. Since the present method has a better sorting effect on small particles, by selecting a feed slurry with smaller ilmenite particles and a higher content, the sorting efficiency of the present method during the sorting process and the utilization rate of raw materials and equipment are improved.

[0090] 8. In the iron-titanium sorting method for micron-sized ilmenite provided by the present invention, the sorting indicators are that the TiO2 grade in the slurry is not less than 46%, and the TiO2 recovery rate is not less than 85%. The slurry after sorting includes concentrate and tailings. By setting the sorting indicators, it is determined whether the concentrate or tailings needs to be sorted again, and the slurry that does not meet the standards is sorted again, thereby improving the recovery rate of titanium metal and controlling the number of multiple sortings.

[0091] 9. In the iron-titanium separation method of micron-sized ilmenite provided by the present invention, the flotation agents include collectors, frothers and sulfuric acid. The flotation agents promote the separation and flotation of minerals by changing the properties of the surface of ilmenite particles. The collector makes the surface of ilmenite particles hydrophilic so that it can combine with bubbles and float to the liquid surface. The frother generates and stabilizes bubbles to help mineral flotation and adjust the pH of the slurry during the flotation process. Sulfuric acid is used to optimize the effectiveness of the agents and the flotation effect of the minerals.

[0092] 10. The present invention also provides an iron-titanium separation system, which has the same beneficial effects as the above-mentioned iron-titanium separation method of micron-grade ilmenite, and will not be described in detail here.

[0093] The above is a detailed introduction to the iron-titanium separation method and iron-titanium separation system of micron-grade ilmenite disclosed in the embodiment of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea: At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention, and any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for separating iron and titanium from micron-sized ilmenite, characterized in that: The following steps are involved: Providing a feed slurry containing micron-sized ilmenite particles, and subjecting the provided feed slurry to roughing through a roughing device to obtain a roughing concentrate and a roughing tailing; The rougher tailings are scavenged by scavenging equipment to obtain scavenged concentrate and scavenged tailings, and it is determined whether to return the scavenged concentrate for re-roughing according to the sorting index; The obtained rougher concentrate is subjected to a primary concentration by a primary concentration device to obtain a primary concentrated concentrate and a primary concentrated tailings. According to the sorting index, it is determined whether to return the primary concentrated tailings for re-roughing or scavenging to obtain the concentrate after sorting.

2. The method for separating iron and titanium from micron-sized ilmenite according to claim 1, characterized in that: The obtained primary concentrated concentrate is subjected to secondary concentration by secondary concentration equipment to obtain secondary concentrated concentrate and secondary concentrated tailings. According to the sorting index, it is determined whether to return the secondary concentrated tailings for re-roughing, scavenging or primary concentration to obtain the concentrate after sorting.

3. The method for separating iron and titanium from micron-sized ilmenite according to claim 2, characterized in that: Flotation reagents are added during roughing, scavenging, primary cleaning and secondary cleaning processes.

4. The method for separating iron and titanium from micron-sized ilmenite according to claim 1, characterized in that: The feed slurry includes flotation reagent and raw material slurry, and the flotation reagent and raw material slurry are evenly mixed through a stirring barrel.

5. The method for separating iron and titanium from micron-sized ilmenite according to claim 3, characterized in that: Roughing equipment, scavenging equipment, primary concentrating equipment and secondary concentrating equipment are all equipped with flotation columns, which are used to separate the concentrate and tailings in the slurry.

6. The method for separating iron and titanium from micron-sized ilmenite according to claim 5, characterized in that: By setting dosing points in the roughing flotation column, the scavenging flotation column, the primary concentrating flotation column and the secondary concentrating flotation column, the flotation reagent is transported to this working link.

7. The method for separating iron and titanium from micron-sized ilmenite according to claim 1, characterized in that: The content of ilmenite particles with a particle size of less than 45 microns in the feed slurry accounts for no less than 50% of the total ilmenite particles, the TiO2 grade in the feed slurry is no less than 13%, and the feed slurry concentration is 30-50%.

8. The method for separating iron and titanium from micron-sized ilmenite according to claim 1, characterized in that: The sorting index is that the TiO2 grade in the ore pulp is not less than 46%, and the TiO2 recovery rate is not less than 85%.

9. The method for separating iron and titanium from micron-sized ilmenite according to claim 6, characterized in that: Flotation reagents include collector, frother and sulfuric acid. The dosage of collector is 7000-9000g\t, the dosage of frother is 200-400g\t, and the dosage of sulfuric acid is 30000-40000g\t.

10. An iron-titanium separation system, used to implement the iron-titanium separation method of micron-sized ilmenite as claimed in any one of claims 1 to 9, characterized in that: include: A roughing module is used to provide a feed slurry containing micron-sized ilmenite particles, and to perform roughing on the provided feed slurry through a roughing device to obtain a roughing concentrate and a roughing tailing; The scavenging module is used to scavenging the rougher tailings through scavenging equipment to obtain scavenging concentrates and scavenging tailings, and to determine whether to return the scavenging concentrates for re-roughing according to the sorting index; The primary concentration module is used to perform primary concentration on the obtained roughing concentrate through the primary concentration equipment to obtain primary concentrated concentrate and primary concentrated tailings. According to the sorting index, it is determined whether to return the primary concentrated tailings for re-roughing or scavenging to obtain the concentrate after sorting.

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