Mixing and conveying method for iron ore concentrate and titanium concentrate

Abstract

The invention relates to the technical field of vanadium titano-magnetite ore dressing, and discloses an iron ore concentrate and titanium concentrate mixed conveying method which comprises the steps that the concentration of iron ore concentrate pulp and the concentration of titanium concentrate pulp are adjusted to the target concentration; mixing and stirring the two kinds of ore pulp after concentration adjustment according to a preset mass ratio to obtain mixed ore pulp, and conveying the mixed ore pulp through a single conveying pipeline; the mixed ore pulp conveyed to the tail end is subjected to multi-stage magnetic separation treatment, separation is conducted through the magnetic difference between the iron ore concentrate and the titanium concentrate, and an iron ore concentrate product and a titanium concentrate product are obtained respectively; and the separated iron ore concentrate product and the separated titanium concentrate product are subjected to dehydration treatment correspondingly. According to the method, only one conveying pipeline, a matched pumping system and a booster pump station need to be built, the pipeline construction cost is reduced by 50% or above, the equipment investment and the land occupation area are reduced by 40%-60%, the construction cost is greatly reduced, and the energy consumption and the operation and maintenance cost are remarkably reduced.

Description

Technical Field

[0001] This invention relates to the field of vanadium-titanium magnetite beneficiation technology, and more particularly to a method for mixing and conveying iron concentrate and titanium concentrate. Background Technology

[0002] In the beneficiation process of vanadium-titanium magnetite, the core products, iron concentrate and titanium concentrate, typically need to be transported from the beneficiation plant to subsequent filtration and dewatering stages via long-distance pipelines to meet the requirements of storage, transportation, or further smelting and processing. Currently, the industry generally adopts a "separate transportation" model for the long-distance transfer of such concentrates, that is, separate parallel transportation pipeline systems are built for iron concentrate and titanium concentrate. Specifically, after the two concentrates are prepared into slurries of a certain concentration, they are independently transported to their destinations using their respective pumping systems and pipelines, and then separately enter filtration equipment to complete dewatering.

[0003] However, this traditional dual-pipeline parallel transportation mode has many significant drawbacks in actual construction and operation: construction and investment costs are high, as a dual-pipeline system requires twice the land resources, pipeline materials, construction and installation work, and supporting facilities such as pump stations and valves. Especially in scenarios with transportation distances exceeding 10 kilometers, the overall construction cost increases by approximately 60% to 80% compared to a single-pipeline solution, placing a heavy initial investment burden on enterprises. Furthermore, it also suffers from complex and costly operation and maintenance, significant energy consumption, and poor space occupation and adaptability.

[0004] Therefore, there is a need for improvements in existing technologies for methods of co-transporting iron concentrate and titanium concentrate. Summary of the Invention

[0005] In view of this, the purpose of this invention is to propose a method for the mixed transportation of iron concentrate and titanium concentrate, which can achieve long-distance transportation by only constructing a single transportation pipeline and supporting system, and can meet the needs of subsequent processing through magnetic separation, thus significantly reducing construction costs and energy consumption.

[0006] To achieve the above objectives, embodiments of the present invention provide a method for mixing and conveying iron concentrate and titanium concentrate, comprising: S1 adjusts the concentrations of the iron concentrate slurry and titanium concentrate slurry to the target concentrations respectively; S2 mixes the two slurries after adjusting their concentrations according to a preset mass ratio to obtain a mixed slurry, and then transports the mixed slurry through a single conveying pipe; The mixed slurry transported to the end by S3 undergoes multi-stage magnetic separation, using the magnetic difference between iron concentrate and titanium concentrate to separate them, and obtain iron concentrate products and titanium concentrate products respectively. S4 dehydrates the separated iron concentrate and titanium concentrate products separately.

[0007] In some embodiments, in S1, the target concentration of the iron concentrate slurry is 55% to 70% by mass percentage, and the target concentration of the titanium concentrate slurry is 55% to 65%.

[0008] In some embodiments, in S2, the preset mass ratio is 1:(0.8~1.2) between the mass ratio of iron concentrate slurry and titanium concentrate slurry.

[0009] In some embodiments, iron concentrate slurry and titanium concentrate slurry are mixed in one of the following three mass ratios to obtain a mixed slurry with the corresponding mass fraction concentration: When the mass ratio is 1:0.8, the concentration of the mixed slurry is 62%–65%; When the mass ratio is 1:1, the concentration of the mixed slurry is 59%–62%; When the mass ratio is 1:1.2, the concentration of the mixed slurry is 56% to 59%.

[0010] In some embodiments, in S2, the stirring speed is 300~500 r / min and the time is 5~10 min.

[0011] In some implementations, in S3, the magnetic separation process is carried out using a two-stage magnetic separator connected in series, wherein the magnetic field strength of the two-stage magnetic separator increases with the increase of the concentration of the mixed slurry.

[0012] In some implementations, the magnetic separation process uses a drum magnetic separator, where iron concentrate is scraped and collected by a scraper device on the surface of the magnetic drum.

[0013] In some implementations, the matching mechanism between the magnetic field strength of the two-stage magnetic separator and the concentration of the mixed slurry includes: When the concentration of the mixed slurry is 62% to 65%, the magnetic field strength of the first-stage magnetic separation is 1600-1700 Gs, and the magnetic field strength of the second-stage magnetic separation is 1700-1800 Gs. When the concentration of the mixed slurry is 59% to 62%, the magnetic field strength of the first-stage magnetic separation is 1400-1500 Gs, and the magnetic field strength of the second-stage magnetic separation is 1500-1600 Gs. When the concentration of the mixed slurry is 56% to 59%, the magnetic field strength of the primary magnetic separation is 1200-1300 Gs, and the magnetic field strength of the secondary magnetic separation is 1300-1400 Gs.

[0014] In some implementations, the purity of the iron concentrate product obtained through two-stage magnetic separation is not less than 98%, and the purity of the titanium concentrate product is not less than 99%.

[0015] In some embodiments, in S4, the moisture content of the dehydrated iron concentrate and titanium concentrate is 8% to 10%.

[0016] The present invention has at least the following beneficial technical effects: (1) Significantly reduce construction costs: Only one pipeline and supporting pumping system and booster pump station need to be built, reducing pipeline construction costs by more than 50%, and reducing equipment investment and land occupation area by 40% to 60%; (2) Significantly reduce energy consumption and operation and maintenance costs: The energy consumption of a single transmission system is 30% to 50% lower than that of a dual system, which is in line with the "green and low-carbon" policy. Operation and maintenance only need to be carried out on one set of pipelines and equipment, and personnel and maintenance costs are reduced by about 50%. (3) High separation purity: By optimizing the magnetic separation parameters, the separation purity is improved to meet the requirements of subsequent processing; (4) Strong adaptability to working conditions: The pretreatment concentration range is widened, which can adapt to more than 90% of mineral processing conditions such as fluctuations in raw ore grade and process adjustments; (5) Simplified system and strong adaptability: The structure of the conveying system is simplified, the dependence of pipeline laying on terrain is reduced, and it has more application advantages in complex terrain areas such as mountains and valleys. At the same time, it reduces the construction difficulty and ecological damage risk. (6) Easy to operate: The mixing and separation processes are both automated, requiring no additional manual operation, resulting in high production efficiency.

[0017] (7) High operational stability: The risk of pipeline blockage is ≤5%, the equipment failure rate is reduced by 40% compared with the dual pipeline system, the degree of automation control is high, and the production efficiency is increased by more than 30%. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram illustrating an embodiment of the method for mixing and transporting iron concentrate and titanium concentrate provided by the present invention; Figure 2 A flowchart of the hybrid conveying process provided by the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are for ease of description only, and should not be construed as limiting the technical solution.

[0022] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., used in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order. "A plurality of" means two or more, unless otherwise explicitly specified.

[0023] In the description and claims of this invention and the foregoing drawings, when an element is referred to as "fixed to," "mounted to," "disposed on," or "connected to" another element, it can be located directly or indirectly on that other element. For example, when an element is referred to as "connected to" another element, it can be directly or indirectly connected to that other element.

[0024] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] In the beneficiation process of vanadium-titanium magnetite, the core products are iron concentrate and titanium concentrate. Both types of concentrate need to be transported over long distances from the beneficiation plant to subsequent filtration processes for dewatering before they can meet the requirements for storage, transportation, or further smelting and processing. The industry generally adopts a "separate transport" model, constructing independent transport pipelines for iron concentrate and titanium concentrate. Long-distance transport is achieved by pumping slurry through these pipelines. After the two concentrates are transported to their respective terminals, they then enter filtration equipment for dewatering. The existing conveying methods have the following problems: (1) High construction cost: The double pipeline laying occupies twice the land resources, and the investment costs of pipeline materials, construction and installation and supporting pumping stations are greatly increased. In the case of long-distance transportation of more than 10km, the construction cost is 60% to 80% higher than that of the single pipeline scheme; (2) High maintenance difficulty: The two systems need to be inspected and maintained separately, the equipment failure rate is superimposed, the investment of maintenance personnel and costs is doubled, and the annual maintenance cost is more than 50% higher than that of a single system. (3) Serious energy waste: When two pumping systems are running simultaneously, the energy consumption is 30% to 50% higher than that of a single system, which does not conform to the trend of energy conservation and consumption reduction; (4) Large space occupation: Dual pipelines require 8-10m passage, while single pipelines only require 3-5m. The difficulty of laying in complex terrain and the risk of ecological damage increase significantly, and it is easy to face difficulties in land approval.

[0026] To address the problems existing in the prior art, this invention proposes a method for single-pipe hybrid long-distance transportation, such as... Figure 1 The diagram shown is a schematic representation of an embodiment of the method for mixing and transporting iron concentrate and titanium concentrate provided by the present invention, including the following steps: S1 adjusts the concentrations of the iron concentrate slurry and titanium concentrate slurry to the target concentrations respectively; S2 mixes the two slurries after adjusting their concentrations according to a preset mass ratio to obtain a mixed slurry, and then transports the mixed slurry through a single conveying pipe; The mixed slurry transported to the end by S3 undergoes multi-stage magnetic separation, using the magnetic difference between iron concentrate and titanium concentrate to separate them, and obtain iron concentrate products and titanium concentrate products respectively. S4 dehydrates the separated iron concentrate and titanium concentrate products separately.

[0027] Furthermore, in S1, the target concentration of iron concentrate slurry is 55%–70% by mass percentage, and the target concentration of titanium concentrate slurry is 55%–65%.

[0028] Furthermore, in S2, the preset mass ratio is 1:(0.8~1.2) between the iron concentrate slurry and the titanium concentrate slurry.

[0029] Iron concentrate slurry and titanium concentrate slurry are mixed in one of the following three mass ratios to obtain a mixed slurry with the corresponding mass fraction concentration: When the mass ratio is 1:0.8, the concentration of the mixed slurry is 62%–65%; When the mass ratio is 1:1, the concentration of the mixed slurry is 59%–62%; When the mass ratio is 1:1.2, the concentration of the mixed slurry is 56% to 59%.

[0030] The two slurries with adjusted concentrations are mixed and stirred at a preset mass ratio to obtain a mixed slurry. The stirring speed is 300~500 r / min and the stirring time is 5~10 min.

[0031] Furthermore, in S3, after long-distance conveying, there are two magnetic separation processes at the end: after the mixed slurry is conveyed to the end, it is fed into a drum magnetic separator for separation. Iron concentrate, due to its strong magnetism, is adsorbed onto the surface of the magnetic medium of the magnetic separator under the action of the magnetic field and is collected by a scraper device to obtain iron concentrate product; titanium concentrate is non-magnetic and is not affected by the magnetic field, and is discharged from the tailings outlet of the magnetic separator with the slurry flow to obtain titanium concentrate product.

[0032] Specifically, the magnetic separation process is carried out using a two-stage magnetic separator connected in series, and the magnetic field strength of the two-stage magnetic separator increases with the increase of the concentration of the mixed slurry.

[0033] In some embodiments, the magnetic separation process uses a drum magnetic separator, where the iron concentrate is scraped and collected by a scraper device on the surface of the magnetic drum. The primary roughing stage adsorbs 82%–88% of the iron concentrate, the secondary cleaning stage adsorbs the remaining iron concentrate, the iron concentrate is combined and collected, and the titanium concentrate is discharged in the secondary stage.

[0034] In some embodiments, the matching mechanism between the magnetic field strength of the two-stage magnetic separator and the concentration of the mixed slurry includes: When the concentration of the mixed slurry is 62% to 65%, the magnetic field strength of the first-stage magnetic separation is 1600-1700 Gs, and the magnetic field strength of the second-stage magnetic separation is 1700-1800 Gs. When the concentration of the mixed slurry is 59% to 62%, the magnetic field strength of the first-stage magnetic separation is 1400-1500 Gs, and the magnetic field strength of the second-stage magnetic separation is 1500-1600 Gs. When the concentration of the mixed slurry is 56% to 59%, the magnetic field strength of the primary magnetic separation is 1200-1300 Gs, and the magnetic field strength of the secondary magnetic separation is 1300-1400 Gs.

[0035] Through two-stage magnetic separation, the purity of the iron concentrate product obtained is not less than 98%, and the purity of the titanium concentrate product is not less than 99%.

[0036] Furthermore, in S4, the separated iron concentrate and titanium concentrate are respectively fed into a filtration device for dehydration treatment. The moisture content of the filtered concentrate is controlled at 8% to 10% to meet the requirements for subsequent storage or processing.

[0037] like Figure 2 The diagram shown is a process flow chart provided by the present invention. Iron concentrate flows from the iron concentrate slurry storage tank into the concentration regulating device, where the concentration is adjusted to 55%~70%. Titanium concentrate flows from the titanium concentrate slurry storage tank into the concentration regulating device, where the concentration is adjusted to 55%~65%. The mixed slurry with the adjusted concentration flows into the mixing and stirring device for uniform stirring, and then flows into a single conveying pipeline for long-distance transport. At the end of the conveying pipeline, the mixed slurry enters the magnetic separator for secondary magnetic separation. After separation, it enters the iron concentrate collection tank and the titanium concentrate collection tank respectively. After filtration by the filtration equipment to reach the required water content, the final product is obtained.

[0038] Furthermore, both the iron concentrate concentration regulating device and the titanium concentrate concentration regulating device are frequency conversion concentration regulators. By monitoring the slurry concentration in real time and providing feedback for adjustment, the fluctuation range of the output slurry concentration is ensured to be no more than ±1%.

[0039] The present invention will be further explained below with reference to specific embodiments.

[0040] A vanadium-titanium magnetite beneficiation plant produces 60 t / h of iron concentrate and 50 t / h of titanium concentrate. The concentrate is transported to a filtration workshop 15 km away via a 250 mm inner diameter pipeline at a pressure of 1.0 MPa. The method of this invention is used for conveying and separating the concentrate. Example 1 Iron concentrate: titanium concentrate = 1:0.8, mixed concentration 62%~65%.

[0041] S1 pretreatment: Iron concentrate pulp 45% adjusted to 65%, titanium concentrate pulp 42% adjusted to 60%; S2 mixing: The mixture is introduced into the stirring device at a mass ratio of 1:0.8, the speed is 400 r / min, and the stirring time is 8 min, resulting in a mixing concentration of 63%. S3 magnetic separation: First-stage magnetic separation magnetic field strength 1650Gs, second-stage magnetic separation magnetic field strength 1750Gs, flow rate 0.8m / s, after separation the iron concentrate purity to 98.6% and the titanium concentrate purity to 99.2%; S4 filtration: Dewatering by filter press, moisture content 9.8%.

[0042] Example 2 Iron concentrate: titanium concentrate = 1:1, mixed concentration 59%~62%.

[0043] S1 pretreatment: Iron concentrate pulp 40% adjusted to 62%, titanium concentrate pulp 40% adjusted to 58%; S2 mixing: Pass the mixture into the stirring device at a 1:1 mass ratio, rotate at 350 r / min, stir for 10 min, and the mixing concentration is 60%; S3 magnetic separation: First-stage magnetic separation magnetic field strength 1450Gs, second-stage magnetic separation magnetic field strength 1550Gs, flow rate 0.7m / s, separation purity of iron concentrate 98.3% and titanium concentrate 99.1%; S4 filtration: Dewatering by filter press, moisture content 9.5%.

[0044] Example 3 Iron concentrate: titanium concentrate = 1:1.2, mixed concentration 56%~59%.

[0045] S1 pretreatment: Iron concentrate pulp 55% adjusted to 60%, titanium concentrate pulp 50% adjusted to 55%; S2 mixing: The mixture is introduced into the stirring device at a mass ratio of 1:1.2, the speed is 450 r / min, and the stirring time is 6 min, resulting in a mixing concentration of 57%. S3 magnetic separation: First-stage magnetic separation magnetic field strength 1250Gs, second-stage magnetic separation magnetic field strength 1350Gs, flow rate 0.9m / s, separation purity of iron concentrate 98.8% and titanium concentrate 99.3%; S4 filtration: Dewatering by filter press, moisture content 10.2%.

[0046] Example 4 Low-concentration verification: iron concentrate: titanium concentrate = 1:1.2, raw pulp 40%.

[0047] S1 Pretreatment: The iron concentrate and titanium concentrate pulp were both adjusted from 40% to 56%; S2 mixing: The mixture is introduced into the stirring device at a mass ratio of 1:1.2, the speed is 400 r / min, and the stirring time is 7 min, resulting in a mixing concentration of 56%. S3 magnetic separation: First-stage magnetic separation magnetic field strength 1200Gs, second-stage magnetic separation magnetic field strength 1300Gs, flow rate 0.6m / s, separation purity of iron concentrate 98.1% and titanium concentrate 99.0%.

[0048] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this invention as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0049] It should be understood that, as used herein, the singular form “a” is intended to include the plural form as well, unless the context clearly supports an exception. It should also be understood that, as used herein, “and / or” refers to any and all possible combinations of one or more of the associated listed items.

[0050] The embodiment numbers disclosed in the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0051] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A method of mixed conveying of iron ore concentrate and titanium ore concentrate, characterized in that, The application relates to a method for separating iron concentrate and titanium concentrate. S1: adjusting the concentrations of iron concentrate slurry and titanium concentrate slurry to target concentrations respectively; S2: mixing and stirring the two kinds of slurry with a preset mass ratio to obtain mixed slurry, and conveying the mixed slurry through a single conveying pipeline; S3: carrying out multi-stage magnetic separation treatment on the mixed slurry at the end, and separating the iron concentrate and the titanium concentrate by utilizing the magnetic difference between the two kinds of concentrate, to obtain iron concentrate products and titanium concentrate products respectively; S4: carrying out dehydration treatment on the separated iron concentrate products and titanium concentrate products respectively.

2. The method for mixed conveying of iron ore concentrate and titanium ore concentrate according to claim 1, characterized in that, In S1, the target concentration of the iron concentrate slurry is 55%-70% by mass percentage, and the target concentration of the titanium concentrate slurry is 55%-65% by mass percentage.

3. The method of claim 1, wherein the mixed conveying of the iron ore concentrate and the titanium ore concentrate is characterized by, In S2, the preset mass ratio is 1: (0.8-1.2) of the mass ratio of the iron concentrate slurry to the titanium concentrate slurry.

4. The method of claim 3, wherein the mixed conveying of the iron ore concentrate and the titanium ore concentrate is characterized by, The iron concentrate slurry and the titanium concentrate slurry are mixed in one of the following three groups of mass ratios, and mixed slurry with corresponding mass fraction concentration is obtained: When the mass ratio is 1:0.8, the concentration of the mixed slurry is 62%-65%; When the mass ratio is 1:1, the concentration of the mixed slurry is 59%-62%; When the mass ratio is 1:1.2, the concentration of the mixed slurry is 56%-59%.

5. The method of claim 1, wherein the mixed conveying of the iron ore concentrate and the titanium ore concentrate is characterized by, In S2, the stirring speed is 300-500 r / min, and the time is 5-10 min.

6. The method of claim 1, wherein the mixed conveying of the iron ore concentrate and the titanium ore concentrate is characterized by, In S3, the magnetic separation treatment is carried out by using two-stage magnetic separators in series, and the magnetic field strength of the two-stage magnetic separators increases with the increase of the concentration of the mixed slurry.

7. The method of claim 6, wherein the mixed conveying of the iron ore concentrate and the titanium ore concentrate is characterized by, The equipment used in the magnetic separation treatment is a drum-type magnetic separator, and the iron concentrate products are collected by a scraper device on the surface of the magnetic cylinder of the magnetic separator.

8. The method of claim 6, wherein the mixed conveying of the iron ore concentrate and the titanium ore concentrate is characterized by, The matching mechanism of the magnetic field strength of the two-stage magnetic separators and the concentration of the mixed slurry includes: When the concentration of the mixed slurry is 62%-65%, the first-stage magnetic field strength is 1600-1700 Gs, and the second-stage magnetic field strength is 1700-1800 Gs; When the concentration of the mixed slurry is 59%-62%, the first-stage magnetic field strength is 1400-1500 Gs, and the second-stage magnetic field strength is 1500-1600 Gs; When the concentration of the mixed slurry is 56%-59%, the first-stage magnetic field strength is 1200-1300 Gs, and the second-stage magnetic field strength is 1300-1400 Gs.

9. The method of claim 8, wherein the mixed conveying of the iron ore concentrate and the titanium ore concentrate is characterized by, Through the two-stage magnetic separation, the purity of the obtained iron concentrate products is not less than 98%, and the purity of the obtained titanium concentrate products is not less than 99%.

10. The method of claim 1, wherein the method is characterized by, In S4, the water content of the iron concentrate and the titanium concentrate after the dehydration treatment is 8%-10%.

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