Beneficiation method of laterite type weathered titanium placer

Abstract

The invention relates to the technical field of beneficiation, in particular to a beneficiation method of laterite type weathered titanium placer, which comprises the following steps of: enriching titanium placer in advance by adopting a rough grinding-strong magnetic separation process, and removing a large amount of slime rich in kaolin minerals; effective recovery of coarse-grained titanium placers is realized by adopting a'multi-stage spiral chute reselection 'process; compared with a conventional spiral chute and a conventional shaking table, the fine-grained ilmenite ore in reselected tailings can be efficiently recycled through the fine grinding-flotation technology, the ilmenite ore concentrate recycling rate can be increased by 10%-15%, and the grade can be increased by 5% or above. And meanwhile, the flotation process under the alkalescence condition is beneficial to environmental protection, and sodium oleate and cetyltrimethylammonium bromide serve as the combined collecting agent so that fine-fraction titanium placer can be collected powerfully. The'strong magnetic separation-reselection-flotation 'combined process provided by the invention can realize asynchronous recovery of coarse and fine fraction titanium placers, improves the utilization rate of resources, and has a good application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and in particular to a ore dressing method for laterite-type weathered titanium sand ore. Background Art

[0002] Titanium has the characteristics of low density, high strength, corrosion resistance, and high temperature resistance. It has been widely used in aerospace, petrochemical, metallurgy, and medical fields. my country has rich reserves of titanium resources, among which the available titanium minerals mainly exist in the form of ilmenite and rutile. Ilmenite is divided into titanium rock and titanium sand. my country's titanium rock is mainly distributed in Panxi and Chengde areas, and titanium sand is mainly distributed in Yunnan, Hainan, Guangdong and Guangxi. According to the degree of weathering, the titanium sand resources can be divided into weathered titanium ore, semi-weathered titanium ore and primary titanium ore. Laterite weathered titanium sand ore has the characteristics of high weathering degree, uneven mineral distribution particle size, high mud content, and high content of red brown iron minerals. This type of mineral structure is relatively loose, the gangue content is low, and the coarse-grained titanium sand ore is relatively easy to recover, but the fine-grained titanium sand ore is affected by factors such as ore mud and monomer dissociation degree and is relatively difficult to recover.

[0003] At present, the laterite-type weathered titanium sand ore often adopts the method of "water mining-water transportation", and the titanium selection process is mostly: "coarse grinding-strong magnetic tailings discarding-fine grinding-conventional gravity separation" of the original ore, but the recovery rate of titanium concentrate obtained by this process is very low, usually 35-50%, and the metal loss is serious, resulting in a huge waste of resources. Conventional gravity separation (spiral chute, shaking table, etc.) is relatively low in the separation efficiency of fine-grained titanium sand ore due to the restriction of the lower limit of the separation particle size, and the flotation method has obvious advantages in this regard, but the presence of a large amount of secondary ore mud also faces many challenges in the efficient recovery of weathered ilmenite by flotation. In addition, the flotation environment of ilmenite is mostly acidic, and strong corrosive agents such as sulfuric acid are required. Flotation agents are not easy to prepare, easily pollute the environment, and the recovery rate is not high.

[0004] There have been relevant reports on the separation method of laterite weathered titanium sand ore. The invention patent with application number CN201210401944.0 discloses the "combined ore dressing process for low-grade laterite weathered titanium sand ore". It first adopts the "weak magnetic-strong magnetic" pretreatment process to discard a large amount of ore mud rich in kaolin minerals, and then adopts "gravity separation-regrinding-gravity separation, gravity separation-regrinding-flotation or regrinding-flotation" treatment, and finally obtains a titanium concentrate product containing 40-50% titanium dioxide. However, the specific process structure of this combined beneficiation process, especially the process structure and reagent system of flotation, are not explained. The invention patent with application number 201710476885.6 discloses the "residual slope accumulation laterite weathered titanium sand ore roughing system and method". It uses a roughing system consisting of a spiral classifier, a mill, a high-efficiency inclined plate classifier, an underflow pump pool, a constant pressure ore separation cylinder and a spiral chute for sorting, and finally obtains a roughing concentrate with a TiO2 grade of up to 33.54% and an operating recovery rate of 86.58%. This method is limited to the roughing of the original ore and does not involve the subsequent links of the production of qualified titanium concentrate. The invention patent with application number CN118218120 A discloses "a fully weathered ilmenite ultrasonic coupling separation process". The process adopts a method of pre-classification of strong magnetic concentrate-shaking table re-selection-middling return, which has the disadvantages of relatively complex process, large shaking table area, and easy accumulation of ore mud and affecting the sorting effect due to the return of middlings. Therefore, the existing process needs to be improved, and the research and development of laterite weathered titanium sand ore beneficiation technology is of great practical significance for improving the utilization rate of such ore resources. Summary of the invention

[0005] The purpose of the present invention is to provide a beneficiation method for laterite-type weathered titanium sand ore, which realizes efficient recovery of laterite-type weathered titanium sand ore through a combined process of "strong magnetic separation-gravity separation-flotation" according to the principle of stage grinding and stage sorting.

[0006] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0007] The present invention significantly improves the beneficiation index of laterite weathered titanium sand ore through the fine separation process of coarse and fine-grained ilmenite of "strong magnetic separation-gravity separation-flotation". The implementation of "strong magnetic separation pre-enrichment-multi-stage spiral gravity separation" effectively removes impurities containing non-titanium minerals such as kaolin, significantly improves the concentration of target minerals, makes full use of the differences in particle size and density of minerals, and promotes the effective separation and concentration of titanium minerals at any stage, thereby ensuring that the final titanium concentrate has a higher TiO2 content and purity, which has a significant positive effect on the low-cost and efficient separation of coarse-grained ilmenite. The concentrated grinding-flotation of medium and tailings, with sodium carbonate as the adjusting agent, realizes the efficient recovery of fine-grained ilmenite under weak alkaline conditions through a specific combination of inhibitors and collectors; the present invention creates an anionic and cationic collector system composed of sodium oleate and hexadecyltrimethylammonium bromide, and exerts the positive synergistic effect of the combined collector. After sodium oleate is adsorbed on the surface of ilmenite, the negative charge of the mineral surface is enhanced, which is conducive to the adsorption of cationic hexadecyltrimethylammonium bromide. Similarly, hexadecyltrimethylammonium bromide will promote the adsorption of anionic sodium oleate after interacting with the surface of ilmenite. Electrostatic adsorption is used to strengthen the interaction between collectors, and ultimately improve the adsorption of collectors on the surface of ilmenite, which not only reduces the consumption of reagents, but also improves the hydrophobicity of the surface of ilmenite.

[0008] A method for beneficiating laterite-type weathered titanium placer ore comprises the following steps:

[0009] S1: After the laterite weathered titanium placer ore is coarsely ground, it is subjected to strong magnetic separation to obtain strong magnetic coarse concentrate and tailings;

[0010] S2: performing a first spiral chute separation on the strong magnetic coarse concentrate to obtain spiral chute (I) coarse concentrate, middlings and tailings;

[0011] S3: performing a second spiral chute separation on the spiral chute (I) coarse concentrate obtained in step S2 to obtain spiral chute (II) coarse concentrate, middlings and tailings;

[0012] S4: performing a third spiral chute separation on the spiral chute (II) coarse concentrate obtained in step S3 to obtain spiral chute (III) coarse concentrate, middlings and tailings;

[0013] S5: performing a fourth spiral chute separation on the spiral chute (III) coarse concentrate obtained in step S4 to obtain titanium concentrate, middlings and tailings;

[0014] S6: The middlings of the spiral ore (I) obtained in step S2 and the middlings and tailings of the spiral ore obtained in step S3-5 are combined and then finely ground;

[0015] S7: after slurrying the material obtained in step S6, adding inhibitors and collectors respectively, aerating flotation, and obtaining roughing concentrate and roughing tailings;

[0016] S8: adding a regulator, an inhibitor, and a collector to the rougher tailings obtained in step S7 to perform scavenging to obtain scavenged concentrate and scavenged tailings;

[0017] S9: The rougher concentrate obtained in step S7 is subjected to primary concentration to obtain a primary concentrated concentrate and a primary concentrated tailings, wherein the primary concentrated tailings and the scavenged concentrate in step S8 are combined and returned to the rougher operation;

[0018] S10: performing secondary concentration on the primary concentrated ore obtained in step S9 to obtain secondary concentrated ore and secondary concentrated tailings, and returning the secondary concentrated tailings to the primary concentration operation;

[0019] S11: Sodium carbonate and a collector are added to the secondary concentrated concentrate obtained in step S10 for three times of concentration to obtain titanium concentrate and tailings, wherein the tailings are returned to the secondary concentration operation.

[0020] Furthermore, in step S1, the laterite weathered titanium sand ore contains almost no strong magnetic iron minerals. The coarse grinding ore has a fineness of -74 μm and a content of 45-55%. The magnetic field strength of the strong magnetic separation is 0.9-1.2T.

[0021] Furthermore, in steps S2 to S5, the spiral chute separation conditions include: feed concentration of 40 to 60%, a longitudinal inclination of 0.6, and a horizontal inclination of 9°.

[0022] Furthermore, in step S6, the fineness of the finely ground ore is -74 μm, and the content of the particle size is 85-95%.

[0023] Further, in step S7, the material slurry is adjusted to pH 7-9 by sodium carbonate, and the amount of sodium carbonate added to the material ore is 500-700 g / t. The inhibitor is sodium hexametaphosphate and carboxymethyl cellulose, and the collector is sodium oleate and hexadecyl trimethyl ammonium bromide. The amount of sodium hexametaphosphate added to the material is 500-800 g / t, the amount of carboxymethyl cellulose added to the material is 80-120 g / t, the amount of sodium carboxyoleate added to the material is 800-1200 g / t, and the amount of hexadecyl trimethyl ammonium bromide added to the material is 400-700 g / t.

[0024] Further, in step S8, the adjusting agent is sodium carbonate, the pH of the slurry is adjusted to 7-9, the amount of sodium carbonate added to the material ore is 200-400 g / t, the inhibitors are sodium hexametaphosphate and carboxymethyl cellulose, the collectors are sodium oleate and cetyltrimethylammonium bromide, the amount of sodium hexametaphosphate added to the material is 250-400 g / t, the amount of carboxymethyl cellulose added to the material is 40-60 g / t, the amount of sodium carboxyoleate added to the material is 400-600 g / t, and the amount of cetyltrimethylammonium bromide added to the material is 200-350 g / t.

[0025] Further, in step S11, the adjusting agent is sodium carbonate, the pH of the slurry is adjusted to 7-9, the amount of sodium carbonate added to the selected concentrate is 250-350 g / t, and a collector is added for aeration flotation, the collector is sodium oleate and hexadecyltrimethylammonium bromide, the amount of sodium oleate added to the selected concentrate is 200-400 g / t, and the amount of hexadecyltrimethylammonium bromide added to the selected concentrate is 100-200 g / t.

[0026] Beneficial effects of the present invention:

[0027] Through the "strong magnetic separation-gravity separation-flotation" coarse and fine particle size iron ore fine separation process, the present invention significantly improves the recovery rate of laterite weathered titanium sand ore. First, in step S1, the implementation of strong magnetic separation is based on the characteristic that there is almost no strong magnetic iron mineral in laterite weathered titanium sand ore. The magnetic field strength of 0.9 to 1.2T is used to effectively remove impurities containing non-titanium minerals such as kaolin. This process can significantly increase the concentration of target minerals in subsequent steps. On this basis, the multiple spiral chute separations in steps S2 to S5 are separated step by step according to different particle sizes to form a coarse concentrate chain of spiral chute (I), spiral chute (II), spiral chute (III) and other coarse concentrates. The implementation of each level of separation makes full use of the differences in particle size and density of minerals, so that titanium minerals can be effectively separated and concentrated at any stage, thereby ensuring that the titanium concentrate finally obtained has a higher TiO2 content and purity, which has a significant positive effect on the low-cost and efficient separation of coarse particle size ilmenite.

[0028] In step S6 of the present invention, the middlings of the spiral sluice (I) obtained in step S2 are combined with the middlings and tailings obtained in steps S3 to S5 and then finely ground, thereby ensuring that the fine-grained titanium sand ore can be more fully dissociated and processed. This design is intended to minimize resource waste, especially in view of the problem that fine-grained minerals in traditional processes are greatly affected by factors such as ore mud and monomer dissociation degree and are difficult to recover. The use of -74μm fineness grinding treatment significantly increases the proportion of minerals involved in flotation in the subsequent flotation process. Through this recycling method, the generation of tailings is reduced, the environmental burden is reduced, and ultimately the efficient use of resources is achieved.

[0029] In the flotation process of steps S7 to S11, the present invention optimizes the flotation environment by adjusting the pH of the slurry to 7-9, combining the use of inhibitors such as sodium hexametaphosphate and carboxymethyl cellulose, and collectors such as sodium oleate and hexadecyltrimethylammonium bromide. Specifically, a reasonable pH value not only improves the flotation of titanium minerals, but also enhances the inhibitory effect of the inhibitor on gangue minerals, thereby improving the selectivity of flotation. For example, sodium hexametaphosphate can effectively inhibit the flotation of silicate gangue minerals, and carboxymethyl cellulose is rich in hydroxyl and carboxyl functional groups, which can selectively adsorb on the surface of calcium and magnesium gangue minerals (such as titanium pyroxene, calcite, dolomite, etc.), causing the surface of calcium and magnesium gangue minerals to be strongly hydrophilic. The use of the above-mentioned combined inhibition creates an important necessary condition for flotation to obtain high-quality ilmenite. The collector of a specific combination of sodium oleate and hexadecyltrimethylammonium bromide can effectively improve the enrichment of fine-grained ilmenite. Sodium oleate is an anionic collector, and its collection ability for ilmenite is relatively weak, but its selectivity is good; hexadecyltrimethylammonium bromide is a cationic collector, and its N-containing group can chelate with the active particles on the surface of ilmenite, showing excellent collection ability. More importantly, the combination of the above anionic and cationic collectors has an obvious positive synergistic effect, which can promote the adsorption of the collector on the surface of ilmenite, reduce the consumption of reagents and cause the surface of ilmenite to be strongly hydrophobic. The combination of the above collectors creates an important sufficient condition for flotation to obtain ilmenite with a high recovery rate. Therefore, the combination of specific inhibitors and collectors promotes the attachment and enrichment of titanium minerals, thereby improving the recovery efficiency of flotation. The optimization of this flotation process enables titanium minerals to be efficiently recovered through reasonable reagent control even in the presence of a large amount of secondary ore mud, overcoming the challenges of traditional flotation processes due to the difficulty in manufacturing reagents, insufficient reagent flotation performance and environmental pollution. The present invention efficiently recovers fine-grained ilmenite through concentrated flotation of middlings and tailings, thereby significantly improving the total recovery rate of titanium, which breaks through the bottleneck of low recovery rate of 35-50% in traditional processes.

[0030] The mineral processing method of the present invention effectively combines "strong magnetic separation-gravity separation-flotation" through a modular phased process to form an efficient and smooth mineral processing process. In this process, the design of each step is closely linked. For example, in steps S9 and S10, through the selection and secondary selection of rough concentrate, it is ensured that the minerals can be fully classified and purified at each stage, and the operational simplicity and economy of the overall system are optimized. This systematic design not only reduces the complexity of operation, but also effectively reduces the required resources and time, and improves the overall economic benefits. In addition, through reasonable reagent addition and environmental control, the cost of reagents and the burden of processing process waste are greatly reduced, which meets the requirements of modern green mining and sustainable development.

[0031] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0033] Figure 1 It is a schematic diagram of the overall process flow of the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] Taking a laterite weathered titanium sand mine in Yunnan as the ore sample, the TiO2 content in the original ore is 4.85%, and TFe is 13.2%. The iron in the magnetite accounts for about 0.7% of the total iron, and the associated gangue minerals are mainly kaolin, plagioclase, potassium feldspar and hematite.

[0037] Specific process flow such as Figure 1 shown.

[0038] A beneficiation method for laterite weathered titanium sand ore as described in this embodiment comprises the following steps:

[0039] (1) grinding the laterite-type weathered titanium sand ore to a particle size of -74 μm with a content of 45%, and performing strong magnetic separation at a magnetic field strength of 0.9 T to obtain a strong magnetic coarse concentrate and tailings (directly discharged);

[0040] (2) subjecting the strong magnetic coarse concentrate to a spiral chute separation at a feed concentration of 40%, a longitudinal inclination of 0.6, and a horizontal inclination of 9° to obtain spiral chute (I) coarse concentrate, middlings, and tailings (directly discharged);

[0041] (3) subjecting the spiral chute (I) coarse concentrate obtained in step (2) to secondary spiral chute sorting at a feed concentration of 40%, a longitudinal inclination of 0.6, and a horizontal inclination of 9° to obtain spiral chute (II) coarse concentrate, middlings, and tailings;

[0042] (4) subjecting the spiral chute (II) coarse concentrate obtained in step (3) to a third spiral chute sorting at a feed concentration of 40%, a longitudinal inclination of 0.4, and a horizontal inclination of 9° to obtain a spiral chute (III) coarse concentrate, middlings, and tailings;

[0043] (5) the spiral chute (III) rough concentrate obtained in step (4) is subjected to a fourth spiral chute separation at a feed concentration of 40%, a longitudinal inclination of 0.4, and a horizontal inclination of 9° to obtain spiral chute (IV) titanium concentrate, middlings, and tailings;

[0044] (6) the middlings of the spiral ore (I) obtained in step (2) and the middlings and tailings of the spiral ore obtained in steps (3) to (5) are combined and finely ground to a particle size content of -74 μm accounting for 85%;

[0045] (7) The pH value of the ore pulp obtained in step (6) is adjusted to 7.2 with sodium carbonate, sodium hexametaphosphate and carboxymethyl cellulose are added, the dosing interval is 3 minutes, and sodium oleate and hexadecyltrimethylammonium bromide collectors are added respectively after stirring for 3 minutes, the dosing interval is 3 minutes, and the mixture is stirred for 3 minutes for aeration flotation to obtain a coarse concentrate and tailings; wherein the amount of sodium carbonate added to the raw material (the material combined from the spiral sluice and the tailings, the same below) is 500 g / t, the amount of sodium hexametaphosphate added to the raw material is 500 g / t, the amount of carboxymethyl cellulose added to the raw material is 80 g / t, the amount of sodium oleate added to the raw material is 800 g / t, and the amount of hexadecyltrimethylammonium bromide added to the raw material is 400 g / t;

[0046] (8) sodium carbonate was added to the roughing tailings obtained in step (7) to adjust the pH value of the slurry to 7.6, sodium hexametaphosphate and carboxymethyl cellulose were added, the dosing interval was 3 min, and sodium oleate and hexadecyltrimethylammonium bromide collectors were added respectively after stirring for 3 min, the dosing interval was 3 min, and the aeration flotation was performed for 3 min to obtain scavenging concentrate and tailings (direct tailings discharge), wherein the addition amount of sodium carbonate in the roughing tailings was 200 g / t, the addition amount of sodium hexametaphosphate in the roughing tailings was 250 g / t, the addition amount of carboxymethyl cellulose in the roughing tailings was 40 g / t, the addition amount of sodium oleate in the roughing tailings was 400 g / t, and the addition amount of hexadecyltrimethylammonium bromide in the roughing tailings was 200 g / t;

[0047] (9) performing a primary concentration on the roughing concentrate obtained in step (7) to obtain a primary concentrated concentrate and a primary concentrated tailings, wherein the primary concentrated tailings and the scavenging concentrate in step (8) are combined and returned to the roughing operation;

[0048] (10) performing secondary concentration on the primary concentrated ore obtained in step (9) to obtain secondary concentrated ore and secondary concentrated tailings, and returning the secondary concentrated tailings to the primary concentration operation;

[0049] (11) Sodium carbonate and a collector are added to the secondary concentration concentrate obtained in step (10) for three times of concentration to obtain titanium concentrate and tailings, wherein the tailings are returned to the secondary concentration operation.

[0050] The third concentration is to add sodium carbonate to adjust the pH value of the slurry to 7.8. The amount of sodium carbonate added to the concentrated ore is 250g / t. After stirring for 3 minutes, sodium oleate and hexadecyltrimethylammonium bromide collectors are added. After stirring for 3 minutes, aeration flotation is performed. The amount of sodium oleate added to the concentrated ore is 200g / t, and the amount of hexadecyltrimethylammonium bromide added to the concentrated ore is 100g / t.

[0051] Test results: The TiO2 grade of the spiral titanium concentrate obtained in this embodiment is 46.85%, and the titanium recovery rate is 43.35%. The TiO2 grade of the titanium concentrate obtained by flotation is 45.25%, and the titanium recovery rate is 25.28%. The TiO2 grade of the comprehensive titanium concentrate is 46.25%, and the titanium recovery rate is 68.63%.

[0052] Example 2

[0053] Taking a laterite weathered titanium sand mine in Yunnan as the ore sample, the TiO2 content in the original ore is 6.82%, TFe is 17.35%, the iron in the magnetite accounts for about 0.9% of the total iron, and the associated gangue minerals are mainly kaolin, plagioclase, potassium feldspar and hematite.

[0054] Specific process flow such as Figure 1 shown.

[0055] A beneficiation method for laterite weathered titanium sand ore as described in this embodiment comprises the following steps:

[0056] (1) grinding the laterite-type weathered titanium sand ore to a particle size of -74 μm, which accounts for about 50%, and performing strong magnetic separation at a magnetic field strength of 1.0 T to obtain strong magnetic coarse concentrate and tailings (direct tailings);

[0057] (2) subjecting the strong magnetic coarse concentrate to a spiral chute separation at a feed concentration of 50%, a longitudinal inclination of 0.6, and a horizontal inclination of 9° to obtain spiral chute (I) coarse concentrate, middlings, and tailings (directly discharged);

[0058] (3) subjecting the spiral chute (I) coarse concentrate obtained in step (2) to secondary spiral chute sorting at a feed concentration of 50%, a longitudinal inclination of 0.6, and a horizontal inclination of 9° to obtain spiral chute (II) coarse concentrate, middlings, and tailings;

[0059] (4) subjecting the spiral chute (II) coarse concentrate obtained in step (3) to a third spiral chute sorting at a feed concentration of 50%, a longitudinal inclination of 0.4, and a horizontal inclination of 9° to obtain a spiral chute (III) coarse concentrate, middlings, and tailings;

[0060] (5) the spiral chute (III) rough concentrate obtained in step (4) is subjected to a fourth spiral chute separation at a feed concentration of 50%, a longitudinal inclination of 0.4, and a horizontal inclination of 9° to obtain spiral chute (IV) titanium concentrate, middlings, and tailings;

[0061] (6) the middlings of the spiral ore (I) obtained in step (2) and the middlings and tailings of the spiral ore obtained in steps (3) to (5) are combined and finely ground to a particle size content of -74 μm accounting for 90%;

[0062] (7) The material obtained in step (6) was adjusted to pH 8.2 with sodium carbonate, sodium hexametaphosphate and carboxymethyl cellulose were added, the dosing interval was 3 min, and sodium oleate and hexadecyltrimethylammonium bromide collectors were added after stirring for 3 min, the dosing interval was 3 min, and aeration flotation was performed for 3 min to obtain a coarse concentrate and tailings; wherein the amount of sodium carbonate added to the raw material (the combined material of the screw sluice and the tailings, the same below) was 600 g / t,

[0063] The amount of sodium hexametaphosphate added to the raw material is 600 g / t, the amount of carboxymethyl cellulose added to the raw material is 100 g / t, the amount of sodium oleate added to the raw material is 1000 g / t, and the amount of cetyltrimethylammonium bromide added to the raw material is 600 g / t;

[0064] (8) sodium carbonate is added to the roughing tailings obtained in step (7) to adjust the pH value of the ore pulp to 8.5, sodium hexametaphosphate and carboxymethyl cellulose are added, the dosing interval is 3 minutes, and sodium oleate and hexadecyltrimethylammonium bromide collectors are added respectively after stirring for 3 minutes, the dosing interval is 3 minutes, and the aeration flotation is carried out for 3 minutes to obtain scavenging concentrate and tailings (direct tailing discharge), wherein the addition amount of sodium carbonate in the roughing tailings is 300g / t, the addition amount of sodium hexametaphosphate in the roughing tailings is 300g / t, the addition amount of carboxymethyl cellulose in the roughing tailings is 50g / t, the addition amount of sodium oleate in the roughing tailings is 500g / t, and the addition amount of hexadecyltrimethylammonium bromide in the roughing tailings is 300g / t;

[0065] (9) performing a primary concentration on the roughing concentrate obtained in step (7) to obtain a primary concentrated concentrate and a primary concentrated tailings, wherein the primary concentrated tailings and the scavenging concentrate in step (8) are combined and returned to the roughing operation;

[0066] (10) performing secondary concentration on the primary concentrated ore obtained in step (9) to obtain secondary concentrated ore and secondary concentrated tailings, and returning the secondary concentrated tailings to the primary concentration operation;

[0067] (11) Sodium carbonate and a collector are added to the secondary concentration concentrate obtained in step (10) for three times of concentration to obtain titanium concentrate and tailings, wherein the tailings are returned to the secondary concentration operation.

[0068] The third concentration is to add sodium carbonate to adjust the pH value of the pulp to 8.4, the amount of sodium carbonate added to the concentrated ore is 300g / t, and sodium oleate and hexadecyltrimethylammonium bromide collectors are added after stirring for 3 minutes. After stirring for 3 minutes, aeration flotation is performed, the amount of sodium oleate added to the concentrated ore is 300g / t, and the amount of hexadecyltrimethylammonium bromide added to the concentrated ore is 150g / t.

[0069] Test results: The TiO2 grade of the spiral titanium concentrate obtained in this embodiment is 46.35%, and the titanium recovery rate is 45.48%. The TiO2 grade of the titanium concentrate obtained by flotation is 45.85%, and the titanium recovery rate is 26.28%. The TiO2 grade of the comprehensive titanium concentrate is 46.17%, and the titanium recovery rate is 71.76%.

[0070] Example 3

[0071] Taking a laterite-type weathered titanium sand mine in Yunnan as the ore sample, the TiO2 content in the original ore is 8.76%, TFe is 19.24%, the iron in the titanomagnetite accounts for about 1.2% of the total iron, and the associated gangue minerals are mainly kaolin, plagioclase, potassium feldspar and hematite.

[0072] Specific process flow Figure 1 shown.

[0073] A beneficiation method for laterite weathered titanium sand ore as described in this embodiment comprises the following steps:

[0074] (1) grinding the laterite-type weathered titanium sand ore to a particle size of -74 μm, which accounts for about 55%, and performing strong magnetic separation at a magnetic field strength of 1.2 T to obtain strong magnetic coarse concentrate and tailings (direct tailings discharge);

[0075] (2) subjecting the strong magnetic coarse concentrate to a spiral chute separation at a feed concentration of 60%, a longitudinal inclination of 0.6, and a horizontal inclination of 9° to obtain spiral chute (I) coarse concentrate, middlings, and tailings (directly discharged);

[0076] (3) subjecting the coarse concentrate of spiral chute (I) obtained in step (2) to secondary spiral chute sorting at a feed concentration of 60%, a longitudinal inclination of 0.6, and a horizontal inclination of 9° to obtain coarse concentrate of spiral chute (II), middlings, and tailings;

[0077] (4) subjecting the spiral chute (II) coarse concentrate obtained in step (3) to a third spiral chute separation at a feed concentration of 60%, a longitudinal inclination of 0.4, and a horizontal inclination of 9° to obtain a spiral chute (III) coarse concentrate, middlings, and tailings;

[0078] (5) the spiral chute (III) rough concentrate obtained in step (4) is subjected to a fourth spiral chute separation at a feed concentration of 60%, a longitudinal inclination of 0.4, and a horizontal inclination of 9° to obtain spiral chute (IV) titanium concentrate, middlings, and tailings;

[0079] (6) the middlings of the spiral ore (I) obtained in step (2) and the middlings and tailings of the spiral ore obtained in steps (3) to (5) are combined and finely ground to a particle size content of -74 μm accounting for 95%;

[0080] (7) The pH value of the slurry obtained in step (6) was adjusted to 9 by using sodium carbonate, sodium hexametaphosphate and carboxymethyl cellulose were added, the dosing interval was 3 minutes, and sodium oleate and hexadecyltrimethylammonium bromide collectors were added after stirring for 3 minutes, the dosing interval was 3 minutes, and aeration flotation was performed for 3 minutes to obtain a coarse concentrate and tailings; wherein the amount of sodium carbonate added to the raw material (the combined material of the screw sluice and the tailings, the same below) was 700 g / t,

[0081] The amount of sodium hexametaphosphate added to the raw material is 800 g / t, the amount of carboxymethyl cellulose added to the raw material is 120 g / t, the amount of sodium oleate added to the raw material is 1200 g / t, and the amount of hexadecyltrimethylammonium bromide added to the raw material is 700 g / t;

[0082] (8) sodium carbonate is added to the roughing tailings obtained in step (7) to adjust the pH value of the slurry to 8.7, sodium hexametaphosphate and carboxymethyl cellulose are added, the dosing interval is 3 min, and after stirring for 3 min, sodium oleate and hexadecyltrimethylammonium bromide collectors are added respectively, the dosing interval is 3 min, and stirring is performed for 3 min and aeration flotation is performed to obtain scavenging concentrate and tailings (direct tailing discharge), wherein the addition amount of sodium carbonate in the roughing tailings is 350 g / t, the addition amount of sodium hexametaphosphate in the roughing tailings is 400 g / t, the addition amount of carboxymethyl cellulose in the roughing tailings is 60 g / t, the addition amount of sodium oleate in the roughing tailings is 600 g / t, and the addition amount of hexadecyltrimethylammonium bromide in the roughing tailings is 350 g / t;

[0083] (9) performing a primary concentration on the roughing concentrate obtained in step (7) to obtain a primary concentrated concentrate and a primary concentrated tailings, wherein the primary concentrated tailings and the scavenging concentrate in step (8) are combined and returned to the roughing operation;

[0084] (10) performing secondary concentration on the primary concentrated ore obtained in step (9) to obtain secondary concentrated ore and secondary concentrated tailings, and returning the secondary concentrated tailings to the primary concentration operation;

[0085] (11) Sodium carbonate and a collector are added to the secondary concentration concentrate obtained in step (10) for three times of concentration to obtain titanium concentrate and tailings, wherein the tailings are returned to the secondary concentration operation.

[0086] The third concentration is to add sodium carbonate to adjust the pH value of the slurry to 9. The amount of sodium carbonate added to the concentrated ore is 350g / t. After stirring for 3 minutes, sodium oleate and hexadecyltrimethylammonium bromide collectors are added. After stirring for 3 minutes, aeration flotation is performed. The amount of sodium oleate added to the concentrated ore is 400g / t, and the amount of hexadecyltrimethylammonium bromide added to the concentrated ore is 200g / t.

[0087] Test results: The TiO2 grade of the spiral titanium concentrate obtained in this embodiment is 46.35%, and the titanium recovery rate is 47.08%. The TiO2 grade of the titanium concentrate obtained by flotation is 46.15%, and the titanium recovery rate is 27.23%. The TiO2 grade of the comprehensive titanium concentrate is 46.28%, and the titanium recovery rate is 74.31%.

[0088] Comparative Example 1

[0089] The test steps of this comparative example are the same as those of Example 1, except that the corresponding spiral chute sorting process is used instead of the "one roughing, one scavenging and three fines" flotation process (i.e., the middlings and tailings from the spiral chute roughing are sent to the spiral chute scavenging; the concentrates and middlings from the spiral chute scavenging, and the middlings and tailings from the spiral chute fines are returned to the previous operation in sequence). The titanium concentrate obtained by the spiral chute has a TiO2 grade of 39.15% and a titanium recovery rate of 15.21%.

[0090] Comparative Example 2

[0091] The test steps of this comparative example are the same as those of Example 1, except that sulfuric acid is used instead of sodium carbonate as the adjusting agent, the pH of the slurry is 5.5, and oxidized paraffin soap and benzohydroxamic acid collectors are used instead of sodium oleate and hexadecyltrimethylammonium bromide combined collectors, and the dosage remains unchanged. The titanium concentrate obtained by flotation has a TiO2 grade of 45.05% and a titanium recovery rate of 21.36%.

[0092] Comparative Example 3

[0093] The test steps of this comparative example are the same as those of Example 2, except that the corresponding shaking table sorting process is used instead of the "one roughing, one sweeping and three fines" flotation process (i.e., the intermediates and tailings from the shaking table roughing are sent to the shaking table sweeping; the concentrates and intermediates from the shaking table sweeping, and the intermediates and tailings from the shaking table fines are returned to the previous operation in sequence). The titanium concentrate obtained by the shaking table has a TiO2 grade of 40.15%, and a titanium recovery rate of 11.21%.

[0094] Comparative Example 4

[0095] The test steps of this comparative example are the same as those of Example 2, except that sulfuric acid is used instead of sodium carbonate as the adjusting agent, the pH of the slurry is 5.5, and sodium oleate is used instead of sodium oleate and hexadecyltrimethylammonium bromide as the combined collector, and the dosage remains unchanged. The titanium concentrate obtained by flotation has a TiO2 grade of 45.58% and a titanium recovery rate of 21.21%.

[0096] Comparative Example 5

[0097] The test steps of this comparative example are the same as those of Example 3, except that the corresponding spiral chute sorting process is used instead of the "one roughing, one scavenging and three fines" flotation process (i.e., the middlings and tailings from the spiral chute roughing are sent to the spiral chute scavenging; the concentrates and middlings from the spiral chute scavenging, and the middlings and tailings from the spiral chute fines are returned to the previous operation in sequence). The titanium concentrate obtained by the spiral chute has a TiO2 grade of 41.15% and a titanium recovery rate of 16.21%.

[0098] Comparative Example 6

[0099] The test steps of this comparative example are the same as those of Example 3, except that sulfuric acid is used instead of sodium carbonate as the adjusting agent, the pH of the slurry is 5.5, and MOH collector is used instead of sodium oleate and hexadecyltrimethylammonium bromide combined collector, and the dosage remains unchanged. The titanium concentrate obtained by flotation has a TiO2 grade of 46.55% and a titanium recovery rate of 23.43%.

[0100] From the above comparative test results, it can be seen that the flotation in the present invention can achieve effective recovery of titanium-containing middlings and tailings, and can increase the recovery rate of ilmenite concentrate by 10-15 percentage points and the concentrate grade by more than 5 percentage points compared with conventional spiral chutes and shaking tables. At the same time, the use of sodium oleate and hexadecyltrimethylammonium bromide combined collectors can effectively capture fine-grained ilmenite minerals. Compared with single sodium oleate, MOH collectors or oxidized paraffin soap and benzohydroxamic acid combined collectors, the concentrate grade does not change much, but the titanium recovery rate is increased by about 4 percentage points.

[0101] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for beneficiating laterite-type weathered titanium placer, characterized in that: The following steps are involved: S1: After the laterite weathered titanium placer ore is coarsely ground, it is subjected to strong magnetic separation to obtain strong magnetic coarse concentrate and tailings; S2: performing a first spiral chute separation on the strong magnetic coarse concentrate to obtain spiral chute (I) coarse concentrate, middlings and tailings; S3: subjecting the spiral chute (I) coarse concentrate obtained in S2 to a second spiral chute separation to obtain spiral chute (II) coarse concentrate, middlings and tailings; S4: The spiral chute (II) rough concentrate obtained in S3 is subjected to a third spiral chute separation to obtain spiral chute (III) rough concentrate, middlings and tailings; S5: the spiral chute (III) rough concentrate obtained in S4 is subjected to a fourth spiral chute separation to obtain titanium concentrate, middlings and tailings; S6: The middlings of the spiral ore (I) obtained in S2 and the middlings and tailings of the spiral ore obtained in step S3-5 are combined and then finely ground; S7: after slurrying the material obtained in S6, depressants and collectors are added respectively, and aeration flotation is performed to obtain roughing concentrate and roughing tailings; S8: adding a regulator, an inhibitor, and a collector to the rougher tailings obtained in S7 to perform scavenging to obtain scavenging concentrate and scavenging tailings; S9: The rougher concentrate obtained in S7 is subjected to primary concentration to obtain a primary concentrated concentrate and a primary concentrated tailings, wherein the primary concentrated tailings and the scavenging concentrate in step S8 are combined and returned to the rougher operation; S10: Perform secondary concentration on the primary concentrated ore obtained in S9 to obtain secondary concentrated ore and secondary concentrated tailings, and the secondary concentrated tailings are returned to the primary concentration operation; S11: Sodium carbonate and a collector are added to the secondary concentrated concentrate obtained in S10 for three times of concentration to obtain titanium concentrate and tailings, wherein the tailings are returned to the secondary concentration operation.

2. The beneficiation method of laterite-type weathered titanium placer according to claim 1, characterized in that: In step S1, the coarse grinding fineness is -74 μm and the particle size content is 45-55%; the magnetic field strength of the strong magnetic separation is 0.9-1.2T.

3. The beneficiation method of laterite-type weathered titanium placer according to claim 1, characterized in that: In steps S2-5, the spiral chute separation conditions include: feed concentration of 40-60%, longitudinal inclination of 0.6, and horizontal inclination of 9°.

4. The beneficiation method of laterite-type weathered titanium placer according to claim 1, characterized in that: In step S6, the fineness of the finely ground ore is -74 μm, and the content of the particle size is 85-95%.

5. The beneficiation method of laterite weathered titanium placer according to claim 1, characterized in that: In step S7, the material slurrying is to adjust the pH value of the slurry to 7-9 with sodium carbonate, and the amount of sodium carbonate added to the material ore is 500-700 g / t; the inhibitor is sodium hexametaphosphate and carboxymethyl cellulose, and the collector is sodium oleate and cetyltrimethylammonium bromide; the amount of sodium hexametaphosphate added to the material is 500-800 g / t, the amount of carboxymethyl cellulose added to the material is 80-120 g / t, the amount of sodium carboxyoleate added to the material is 800-1200 g / t, and the amount of cetyltrimethylammonium bromide added to the material is 400-700 g / t.

6. The beneficiation method of laterite weathered titanium placer according to claim 1, characterized in that: In step S8, the adjusting agent is sodium carbonate, and the pH value of the slurry is adjusted to 7-9. The amount of sodium carbonate added to the material ore is 200-400 g / t. The inhibitors are sodium hexametaphosphate and carboxymethyl cellulose. The collectors are sodium oleate and cetyltrimethylammonium bromide. The amount of sodium hexametaphosphate added to the material is 250-400 g / t, the amount of carboxymethyl cellulose added to the material is 40-60 g / t, the amount of sodium carboxyoleate added to the material is 400-600 g / t, and the amount of cetyltrimethylammonium bromide added to the material is 200-350 g / t.

7. The beneficiation method of laterite weathered titanium placer according to claim 1, characterized in that: In step S11, the adjusting agent is sodium carbonate, and the pH of the slurry is adjusted to 7-9. The amount of sodium carbonate added to the selected concentrate is 250-350 g / t, and a collector is added for aeration flotation. The collectors are sodium oleate and hexadecyltrimethylammonium bromide. The amount of sodium oleate added to the selected concentrate is 200-400 g / t, and the amount of hexadecyltrimethylammonium bromide added to the selected concentrate is 100-200 g / t.

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