Mineral processing technology for comprehensive recycling of inert titanium slag

Abstract

The invention develops an efficient inert titanium slag recovery process. Titanium and coal resources are synchronously recovered by adopting a flotation-reselection combined technology. The method comprises the following steps: mixing inert titanium slag to prepare ore pulp D, mixing the ore pulp D with diesel oil / kerosene and a combined reagent, and separating coal concentrate F through a flotation column; screening the tailings E, and roughing through a centrifugal jigger to obtain titanium concentrate J; and the residual tailings are scavenged by a suspended vibration conical surface concentrating machine to produce titanium concentrate K, recyclable middlings L and standard tailings M. Concentrate is concentrated, filtered and stored, and middling L and return water are subjected to closed-loop cyclic utilization. The process is integrated with an intelligent control system, efficient and comprehensive utilization of inert titanium slag resources is achieved, solid waste emission meets the environmental protection standard, the water resource recycling rate reaches 95% or above, remarkable economic benefits and environmental benefits are achieved, and a green solution is provided for titanium slag recycling.

Description

Technical Field

[0001] The present invention relates to the application of mineral processing technology in the field of smelting waste slag treatment and recovery, solving many problems existing in the effective recovery and utilization of inert titanium slag, and realizing the maximum utilization of inert titanium slag renewable resources. By using intelligent mineral processing equipment and automating the control of various physical and chemical indicators of inert titanium slag in the process flow, the comprehensive recovery and mineral processing process of inert titanium slag is optimized. Background Art

[0002] Inert titanium slag is a kind of waste residue produced in the production process of titanium tetrachloride. In the industrial process of titanium dioxide production, high titanium slag or rutile is used as raw materials to react with chlorine at high temperature. In addition to the main product of titanium tetrachloride, some impurities and unreacted substances will also form waste residue. Its main components include titanium oxide, other metal oxides, chlorides and some insoluble silicates. Inert titanium slag contains valuable minerals such as petroleum coke and rutile. Among them, the C grade of petroleum coke is 20%~30%, and the grade of rutile TiO2 is 10%~35%, which is a good titanium resource. Titanium slag is in the form of solid powder or fine particles, with a high mud content of about 50% in the 200 mesh, and has a certain viscosity; the particle size distribution of the slag particles is uneven, and the components are wrapped around each other. The complex ore properties are difficult to achieve efficient separation with simple treatment methods. In particular, the residual Cl ions in the inert titanium slag are strongly acidic and highly corrosive when dissolved in water, causing harm to the surrounding environment and posing potential environmental risks. Slag discharge is an important problem that needs to be urgently solved in the production process of titanium tetrachloride production enterprises.

[0003] At present, the commonly used process is: after the inert titanium slag is slurried with water, it is separated by screening operation to obtain coal concentrate products containing coarse-grained diesel coal and petroleum coke, or the flotation process is used to flotate and produce part of the petroleum coke products, with a yield of 20% and a coal concentrate with a C content of about 60%~70%; the tailings are separated by gravity separation equipment (such as blanket machines, spiral chutes, shaking tables, etc.), and titanium concentrate with a TiO2 content of about 65% is produced, with a yield of 14.28%. The existing process flow is simple and cannot meet the needs of comprehensive utilization of slag materials. Although the investment is small and the production cost is low, the quality of the products is difficult to improve. Summary of the invention

[0004] The invention relates to the field of inert titanium slag treatment, solves many problems existing in the process of effective recycling of inert titanium slag, and realizes the maximum utilization of inert titanium slag renewable resources.

[0005] The present invention is a mineral processing process for comprehensive recycling of inert titanium slag, comprising the following steps: 1. Make pulp with inert titanium slag according to the concentration requirement, and add a certain amount of alkaline solution to neutralize it to obtain pulp A; 2. Preferably, in step (1), the ratio of inert titanium slag to water in slurry A is 5:3, and the amount of NaOH alkaline solution added is controlled according to the slurry pH value of 6.0-7.5, mainly using a pH meter and an alkaline solution replenishment pump to form a chain control; 3. The slurry A is transported to the grinding mill for grinding, and the discharge of the grinding mill is classified to obtain slurry B and coarse particles C; 4. Return the coarse material C to the grinding mill for further grinding, forming a closed-circuit grinding and classification system; 5. Preferably, the particle size of slurry B in step (3) is controlled to -200 mesh 85%; 6. Add petroleum coke collector to pulp B for flotation separation to obtain flotation foam petroleum coke product D and flotation tailing slurry E; 7. Preferably, in step (6), a reagent system formed by diesel, kerosene and a combination of reagents is used to capture the target mineral of petroleum coke to obtain coal concentrate. The flotation equipment uses an SF type flotation machine and a flotation column; 8. Classify the tailings slurry E and remove the coarse slag F to obtain slurry G; 9. Preferably, in step (8), the particle size of the slurry G is -150 mesh 100%; 10. The slurry G is transported to the gravity separation operation for separation to obtain a rutile-rich titanium concentrate gravity separation product H and a tailings product I; 11. Preferably, the slurry concentration in step (10) is 20% to 30%, and the gravity separation equipment is mostly a centrifuge, a slurry shaker, a cyclone, or other gravity separation equipment that is conducive to fine particle recovery; 12. The petroleum coke product D, the rutile-rich titanium concentrate gravity separation product H and the tailings product I are pumped to their respective product concentration and filtration systems for concentration and filtration, and the return water is returned to the flotation and gravity separation systems for recycling.

[0006] The present invention uses advanced mineral processing equipment to optimize the combination of mineral processing technology for comprehensive recycling of inert titanium slag, and intelligently controls the main process parameters and conditions in the process flow. The production process is intelligent and the production operation is safe. The technical indicators obtained are: the C content of coal concentrate is 78% to 81%, and the selection ratio is 3.5; titanium dioxide: 81% to 93%, and the selection ratio is 4.5. The smelting waste slag is effectively utilized, providing a new way to efficiently use renewable resources and solving the problem of difficult waste slag discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The figure is a schematic diagram of a mineral processing process for recycling and utilizing inert titanium slag; Figure 2 This is a process connection diagram of various equipments in a comprehensive recovery and utilization of inert titanium slag beneficiation process; Figure 3 The linear flow chart of a comprehensive recovery and utilization process of inert titanium slag is shown in the figure. DETAILED DESCRIPTION

[0008] The present invention uses advanced mineral processing equipment to optimize the combination of inert titanium slag comprehensive recycling and mineral processing technology, and intelligently controls the main process parameters and conditions in the process flow. The production process is intelligent, the production operation is safe, and the product quality is excellent. The harmless treatment is thorough, the production water is used in a closed-loop cycle, water resources are saved, the solid waste discharge meets the standards, and the economic benefits and environmental protection are considerable.

[0009] 1. The slurry preparation system makes slurry from inert titanium slag according to the concentration requirements. The ratio of inert titanium slag to water is 5:3. At the same time, a certain amount of alkaline solution is added for neutralization. The pH value of the slurry is required to be 6.0~7.5. The concentration of NaOH alkaline solution is controlled to be 20%. The three substances are mixed to obtain slurry A. The control system mainly uses a pH meter and an alkaline solution addition pump to form a chain control.

[0010] 2. The grinding and grading closed-circuit system transports slurry A into the mill for grinding to obtain the mill discharge product B. Slurry B is classified by a spiral classifier to obtain slurry D and coarse-grained material C. The particle size of slurry D is controlled to -200 mesh 85%, and the coarse-grained material C is returned to the mill for re-grinding to form a grinding and grading closed-circuit system. To ensure a better grinding effect, it is necessary to establish a continuous and stable steel ball addition system to ensure a higher monomer dissociation degree and avoid mudification caused by over-grinding of the material, which affects the mineral processing and sorting effect.

[0011] 3. The flotation decoaling system flows the slurry D by gravity to the slurry mixing barrel of the flotation system. According to a reasonable reagent system, diesel, kerosene, combined reagents and other reagents are added to the slurry mixing barrel. The petroleum coke target mineral slurry attached with reagents is captured in the flotation machine to achieve flotation separation, and the flotation foam petroleum coke product F and flotation tailings E are obtained; the flotation equipment mostly uses SF flotation machine and CPT flotation column.

[0012] 4. The gravity separation titanium system feeds the tailings E into the linear vibrating screen for screening, removes the coarse slag product H, and the particle size of the slurry G under the screen is -150 mesh 100%, and the concentration is 20%~30%. The slurry G is transported to the gravity separation operation for sorting. The gravity separation operation uses a centrifugal jig to configure the roughing operation, and the suspended vibration cone concentrator is configured with a scavenging operation. The slurry G is fed into the centrifugal jig for sorting to obtain the rutile-rich titanium concentrate gravity separation product J and the tailings product I; the tailings product I is fed into the suspended vibration cone concentrator for scavenging to obtain titanium concentrate K, middlings L and tailings M. The middlings L are returned to the slurry preparation system in a closed circuit as supplementary water for inert titanium slag slurrying.

[0013] 5. The product dehydration system pumps the petroleum coke product E, the rutile-rich titanium concentrate gravity separation products J and K, and the tailings product M to their respective product concentration and filtration systems for concentration and filtration. The products are stored in separate warehouses, and the return water is returned to the flotation and gravity separation systems for recycling.

[0014] Example 1: Press Figure 3 As shown in the flow chart, the ratio of inert titanium slag and water is 5:3, the concentration of slurry A is 50%, the particle size of slurry D is controlled to -200 mesh 85%; the thickness of the froth layer of the flotation column is controlled to 600cm, 800cm, and 1000cm; the particle size of the slurry G under the screen is -150 mesh 100%, the concentration is 25%, the centrifugal jig centrifugal speed is 570 rpm, and the suspended cone concentrator disk speed is 25 rpm. The products obtained are as follows:

[0015] Example 2: Press Figure 3 As shown in the flow chart, the ratio of inert titanium slag and water is 5:3, the concentration of pulp A is 50%, the particle size of pulp D is controlled to -200 mesh 65%, 75%, 85%; the thickness of the flotation column foam layer is controlled to 1000cm; the particle size of the under-screen pulp G is -150 mesh 100%, the concentration is 25%, the centrifugal jig centrifugal speed is 570 rpm, and the suspended cone concentrator disk speed is 25 rpm. The products obtained are as follows:

[0016] Example 3: Press Figure 3 As shown in the flow chart, the ratio of inert titanium slag and water is 5:3, the concentration of pulp A is 50%, the particle size of pulp D is controlled to -200 mesh 85%; the thickness of the froth layer of the flotation column is controlled to 1000cm; the particle size of the under-screen pulp G is -150 mesh 90%, -150 mesh 100%, -200 mesh 100%, the concentration is 25%, the centrifugal jig centrifugal speed is 570 rpm, the suspended cone concentrator disk speed is 25 rpm, and the obtained products are as follows:

[0017] Example 4: Press Figure 3 As shown in the flow chart, the ratio of inert titanium slag and water is 5:3, the concentration of slurry A is 50%, the particle size of slurry D is controlled to -200 mesh 85%; the thickness of the flotation column foam layer is controlled to 1000cm; the particle size of the under-screen slurry G is -150 mesh 100%, the concentration is 25%, the centrifugal jig centrifugal speed is 570 rpm, 670 rpm, 770 rpm, the suspended cone concentrator disk speed is 25 rpm, and the products obtained are as follows:

[0018] Example 5: Press Figure 3As shown in the flow chart, the ratio of inert titanium slag and water is 5:3, the concentration of slurry A is 50%, the particle size of slurry D is controlled to -200 mesh 85%; the thickness of the flotation column foam layer is controlled to 1000cm; the particle size of the under-screen slurry G is -150 mesh 100%, the concentration is 25%, the centrifugal jig centrifugal speed is 570 rpm, the suspended cone concentrator disk speed is 20 rpm, 25 rpm, 30 rpm, and the products obtained are as follows:

[0019] Example 6: Press Figure 3 As shown in the flow chart, the ratio of inert titanium slag and water is 5:3, the concentration of slurry A is 50%, the particle size of slurry D is controlled to -200 mesh 85%; the thickness of the flotation column foam layer is controlled to 1000cm; the particle size of the slurry G under the screen is -150 mesh 100%, the concentration is 25%, the centrifugal jig speed is 570 rpm, and the bed stone density is 4.2kg / M 3 , 4.7 kg / M 3 The disk speed of the suspended vibration cone concentrator is 25 rpm, and the products obtained are as follows:

Claims

1. A mineral processing process for comprehensive recycling of inert titanium slag, characterized in that: The steps include: 1.

1. Make pulp of inert titanium slag according to the concentration requirement, and add a certain amount of alkaline solution to neutralize it to obtain pulp A; 1.

2. The slurry A is transported to the grinding mill for grinding, and the discharge of the grinding mill is classified to obtain slurry B and coarse particles C; 1.

3. Return the coarse material C to the grinding mill for re-grinding to form a closed-circuit grinding and classification system; 1.

4. Add petroleum coke collector to pulp B for flotation separation to obtain flotation foam petroleum coke product D and flotation tailing slurry E; 1.

5. Classify the tailings slurry E and remove the coarse slag F to obtain slurry G; 1.

6. The slurry G is transported to the gravity separation operation for separation to obtain a rutile-rich titanium concentrate gravity separation product H and a tailings product I; 1.

7. The petroleum coke product D, the rutile-rich titanium concentrate gravity separation product H and the tailings product I are pumped to their respective product concentration and filtration systems for concentration and filtration, and the circulating water is returned to the flotation and gravity separation systems for recycling.

2. The beneficiation process of inert titanium slag according to claim 1, characterized in that The ratio of inert titanium slag and water in slurry A is 5:

3. A pH meter and an alkaline solution replenishing pump are used to form a chain control, and the amount of NaOH alkaline solution added is controlled according to the slurry pH value of 6.0~7.

5.

3. According to the beneficiation process of inert titanium slag in claim 1, the grinding particle size of slurry B is controlled to be -200 mesh 85%, and the concentration is 60%~80%.

4. According to the beneficiation process of inert titanium slag in claim 1, the particle size of the slurry G entering the gravity separation operation is -150 mesh 100%, the concentration is 20%~30%, and the gravity separation equipment is mostly suspended vibration cone concentrator, pulsating centrifuge, sludge shaker, cyclone and other gravity separation equipment that is conducive to fine particle recovery.

5. According to the beneficiation process of inert titanium slag in claim 5, the middling ore L is returned to the slurry preparation system in a closed circuit to serve as supplementary water for slurrying of the inert titanium slag.

6. According to the beneficiation process of inert titanium slag according to claim 5, the medium ore L enters the cyclone through a slurry pump to obtain coarse-particle slurry and fine-particle overflow, and the fine-particle overflow is used as supplementary water for inert titanium slag slurrying and returned to the slurry preparation system. The coarse-particle slurry is combined with the product I and transported to the feed trough of the suspended vibration cone concentrator to enter the scavenging operation.

7. The beneficiation process of inert titanium slag according to claim 1, characterized in that The inert titanium slag contains petroleum coke C 20%~30%, TiO210%~35%, SiO2 12.5%, Fe2O313.08%, and the particle size is about -200 mesh 50%.

8. The beneficiation process of inert titanium slag according to claim 1, characterized in that The C content of petroleum coke in the obtained coal concentrate is 77%~83%; the TiO2 content of the titanium concentrate is 80%~92%.

9. The inert titanium slag beneficiation process according to claim 1, wherein the reagent system formed by diesel, kerosene and combined reagents is used to capture the target mineral of petroleum coke to obtain coal concentrate. The flotation equipment adopts SF flotation machine and CPT flotation column.

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