Sanding section production line of monazite mineral aggregate and process of sanding section production line

Abstract

The invention provides a monazite mineral aggregate sanding section production line and a process thereof, and belongs to the technical field of rare earth mineral aggregate hydrometallurgy, the production line comprises a pulping section, a pulping section, a middle section and a rear storage section; the stock bin of the pulping section is shunted to a downstream pulping tank through a hoister material distributor; the pulping section is provided with at least one sand mill, the middle section is provided with at least one middle groove, the rear storage section is provided with at least one rear storage groove, and the groove bottom of the rear storage groove is connected to the downstream through a process pipeline. Alkali water and monazite directly enter a sand mill for ore grinding by adopting an alkali return wet grinding process, alkali continuously participates in a chemical reaction with the monazite in the ore grinding process and is uniformly mixed, sodium hydroxide is added into ore pulp obtained after fine grinding, the ore pulp reacts and is mixed again through stirring, and the ore pulp is pumped to a downstream process under the centrifugal force effect of a slurry pump. According to the continuous process production, the uniformity of the ore pulp and the thoroughness of chemical reaction are ensured, and the recovery rate and the product consistency of subsequent rare earth extraction are favorably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rare earth ore wet metallurgy, in particular to a sand grinding section production line for monazite ore and a process thereof. BACKGROUND

[0002] In general, the conventional process for ore particle grinding is directly completed in a reaction kettle, which has a long reaction time and causes uneven mixing due to the size of the kettle and the form of the stirrer, resulting in high energy consumption and low decomposition rate. The particle size of the ground product of the conventional process grinding equipment for ore particles is generally between 80 and 400 meshes, which cannot meet the requirements of modern industries such as electronics, coatings, and inks.

[0003] In terms of grinding efficiency, the traditional mill (such as Raymond mill, jet mill, and ball mill) mostly adopts dry grinding, which requires multiple cycles of material in the grinding cavity to achieve a certain fineness, and is prone to over-grinding, with relatively low overall efficiency. In many cases, continuous production cannot be achieved, and intermittent processes have to be used, which affects the production efficiency to some extent. Moreover, dry grinding produces a large amount of dust, increases material pollution, affects product purity, and has relatively weak ability to handle material agglomeration.

[0004] Traditional mills also have prerequisites for handling materials, and they have poor adaptability to materials with high moisture and strong viscosity, and are generally suitable for materials such as ores with moderate hardness and low moisture. Traditional mills also inevitably cause material loss and dust pollution. SUMMARY

[0005] The technical task of the present application is to solve the deficiencies of the prior art and provide a sand grinding section production line for monazite ore and a process thereof.

[0006] The technical solution of the present application is implemented in the following manner. The sand grinding section production line for monazite ore of the present application comprises a pulp preparation section, a pulp grinding section, an intermediate section, and a post-storage section.

[0007] The structure of the pulp preparation section is that the bottom of the stock bin is connected to the elevator through the closed air discharge device, the top of the elevator is connected downward to the material distributor, and the material distributor is connected to at least two pulp preparation tanks downstream.

[0008] The tank bottom of the pulp preparation tank outputs a slurry pipeline.

[0009] The pulp grinding section is composed of at least one sand mill, which adopts a wet horizontal grinding cavity sand mill. The downstream of the slurry pipeline is connected to the feed interface of the sand mill, and the discharge interface of the sand mill is connected to the pulp grinding pipeline.

[0010] The intermediate section is composed of at least one intermediate tank, the top of the intermediate tank is connected to the downstream of the pulp pipeline, the bottom of the intermediate tank is connected to the downstream of the refining pipeline,

[0011] The output pipeline of the bottom of the intermediate tank is connected to the downstream of the refining mill;

[0012] The downstream of the refining mill is connected to the top of the downstream tank, and the bottom of the downstream tank is connected to the downstream through the process pipeline.

[0013] The material distributor adopts a bifurcated chute or a gate distributor.

[0014] An alkali return tank is also provided upstream of the pulp tank, and the alkali return tank is connected to the pulp tank through an alkali return pipe provided with a flow control valve.

[0015] The pulp tank is provided with two first and second pulp tanks, and the downstream output pulp pipelines of the two pulp tanks are combined and connected to the sand mill; the pulp tank is provided with a stirring mechanism composed of a stirring motor, a stirring shaft and a stirring paddle.

[0016] The pulp section is provided with a pre-milling pulp line;

[0017] The structure of the pre-milling pulp line is that the bottom of the second material bin is connected to the second elevator, the top of the second elevator is connected to the downstream of the vertical sand mill through the second material distributor;

[0018] The bottom of the vertical sand mill is connected to the downstream of the pulp tank through the pre-milling output pipeline;

[0019] The pre-milling output pipeline at the bottom of the vertical sand mill is provided with a reflux pipe connected to the vertical sand mill.

[0020] The grinding section is provided with a main sand mill, an auxiliary sand mill and a refining mill;

[0021] The main sand mill and the auxiliary sand mill are connected in parallel and run simultaneously or independently; the grinding pipelines of the main sand mill and the auxiliary sand mill are combined and extended to the downstream of the intermediate tank;

[0022] The output pipeline of the intermediate tank is connected to the downstream of the refining mill;

[0023] The refining mill is connected to the downstream of the downstream tank through the refining pipeline.

[0024] The intermediate section is provided with two groups of intermediate tanks; the two groups of intermediate tanks are connected in parallel and run simultaneously or independently;

[0025] The grinding pipelines of the main sand mill and the auxiliary sand mill are combined and then divided into two pipelines, which are connected to the two groups of intermediate tanks respectively;

[0026] Each intermediate tank in each group is respectively provided with a stirring mechanism;

[0027] The bottom output pipelines of the two groups of intermediate tanks are merged and communicated to the refining mill.

[0028] The rear storage section is provided with two groups of parallel rear storage tanks;

[0029] The bottom process pipelines of the two groups of rear storage tanks are merged and communicated to the downstream.

[0030] The sand grinding process of monazite ore, which is based on the sand grinding section production line of the monazite ore, adopts an alkali return wet grinding process:

[0031] The monazite fine ore is put into a bin, lifted by an elevator, distributed to parallel pulp preparation tanks by a material distributor, and the pulp preparation tanks are provided with stirring mechanisms to stir and pulp the monazite fine ore;

[0032] The alkali liquid in the alkali return tank is added to the pulp preparation tank to participate in the pulp preparation;

[0033] The pulp in the pulp preparation tank is pumped to a sand grinder in a wet horizontal grinding cavity for sand grinding;

[0034] The ground pulp is transported to an intermediate tank, where it is continuously stirred and evenly pulped, and the stable and evenly pulped slurry is pumped from the bottom of the intermediate tank to a refining mill for regrinding, and the regrinded pulp is pumped to a rear storage tank for continuous stirring and even pulping, and then transported to the downstream process;

[0035] The alkali liquid in the alkali return tank is respectively delivered to the pulp preparation tank, the intermediate tank and the rear storage tank through flow control;

[0036] The above constitutes a continuous monazite ore sand grinding process.

[0037] The alkali return wet grinding process: directly use alkali water + monazite to enter the sand grinder for grinding, and the alkali continuously participates in the chemical reaction with the monazite during the grinding process, and the mixture is uniform, the ground pulp is added with sodium hydroxide to react and mix again through stirring, and the mixed pulp is pumped to the downstream process under the centrifugal force of the slurry pump.

[0038] Compared with the prior art, the present application has the following beneficial effects:

[0039] In the prior art, dust control is missing during transportation, resulting in the diffusion of radioactive dust. The single-stage sand grinder in the traditional technology processes high-hardness monazite, and when the pulp preparation tank is directly connected to the sand grinder, the flow fluctuation causes the grinding cavity to be empty or overloaded, and the medium crushing rate increases; the particle size is difficult to stabilize in the micron level, and the particle size distribution is wide, which affects the subsequent rare earth leaching rate and the system stability is poor.

[0040] The present invention relates to a production line and process for the sand grinding section of monazite ore. Key sections (slurry preparation, grinding, intermediate processing, and post-storage) employ multiple parallel devices, supporting independent or simultaneous operation. This parallel, switchable design ensures that the entire production line does not need to shut down when a single device fails or requires maintenance, significantly improving equipment utilization and production continuity.

[0041] The alkaline return wet milling process allows the alkaline solution to participate in the reaction from the beginning of pulp preparation. By utilizing the high-intensity grinding and mixing action of the sand mill, the alkali and monazite mineral particles can be in more complete contact, the reaction can be more uniform, and the speed can be faster.

[0042] Multi-stage stirring and alkali replenishment in the slurry preparation tank, intermediate tank, and post-storage tank ensure the uniformity of the slurry and the thoroughness of the chemical reaction, which is conducive to improving the recovery rate and product consistency of subsequent rare earth extraction.

[0043] The production line can flexibly adjust its operating mode according to the characteristics of the ore and the processing capacity requirements, making it highly adaptable.

[0044] In terms of product fineness, it can grind materials to a finer particle size, usually reaching the submicron or even nanometer level, which is suitable for fields with extremely high fineness requirements, such as electronics, coatings, and inks.

[0045] In terms of grinding efficiency, wet grinding allows materials to quickly reach the required fineness under the impact and shearing action of the grinding media, and it can be produced continuously with high production efficiency.

[0046] In terms of product quality, wet grinding can effectively avoid dust and reduce material contamination. It also provides good material dispersion during the grinding process, resulting in more stable product quality.

[0047] In terms of applicability, it is widely applicable to the processing of mineral granular materials with high hardness.

[0048] Regarding material loss, wet grinding is adopted to ensure that the material is as close as possible to 100% utilization, thus minimizing material loss.

[0049] The wet-type horizontal grinding chamber sand mill offers higher grinding efficiency, enabling continuous feeding and discharging 24 hours a day. It achieves a narrower particle size distribution, with concentrated material residence time within the horizontal cylinder, resulting in superior product particle size uniformity compared to vertical sand mills, and is also easier to maintain.

[0050] The sand grinding production line for monazite ore of the present invention has a reasonable design, simple structure, safety and reliability, convenient use and easy maintenance, and has great value for promotion and application. Attached Figure Description

[0051] Appendix Figure 1 This is a schematic diagram of the structural layout of the present invention;

[0052] Figure Figure 2 is a schematic diagram of the process flow configuration structure of the application.

[0053] The marks in the drawings represent respectively:

[0054] 1, pulp preparation section, 2, grinding section, 3, intermediate section, 4, post-storage section,

[0055] 5, silo, 6, closed air unloader, 7, elevator, 8, material distributor,

[0056] 9, pulp preparation tank, 10, pulp pipeline,

[0057] 11, sand mill, 12, feed interface, 13, discharge interface, 14, grinding pipeline,

[0058] 15, intermediate tank, 16, output pipeline,

[0059] 17, refiner, 18, refined material pipeline,

[0060] 19, post-storage tank, 20, process pipeline,

[0061] 21, back lye tank, 22, flow control valve, 23, back lye pipe,

[0062] 24, first pulp preparation tank, 25, second pulp preparation tank,

[0063] 26, stirring mechanism, 27, stirring motor, 28, stirring shaft, 29, stirring paddle,

[0064] 30, pre-grinding pulp preparation line,

[0065] 31, second silo, 32, second elevator, 33, second material distributor, 34, vertical sand mill, 35, pre-grinding output pipeline, 36, backflow pipe,

[0066] 37, flow valve, 38, flow pump. DETAILED DESCRIPTION

[0067] The sand grinding section production line of monazite ore and its process will be described in detail below in combination with the drawings.

[0068] As shown in the drawings, the sand grinding section production line of monazite ore of the application is characterized by comprising a pulp preparation section, a grinding section, an intermediate section, and a post-storage section.

[0069] The structure of the pulp preparation section is that the bottom of the silo is connected to the elevator through the closed air unloader, the top end of the elevator is connected downward to the material distributor, and the material distributor is connected to the downstream pulp preparation tank in a shunt manner.

[0070] The material distributor adopts a bifurcated chute or a gate shunt.

[0071] The alkali liquor return tank is connected to the pulping tank through an alkali liquor return pipe provided with a flow control valve.

[0072] A slurry outlet pipe is arranged at the bottom of the pulping tank.

[0073] The pulping tank is provided with two pulping tanks, i.e., a first pulping tank and a second pulping tank, and the slurry outlet pipes of the two pulping tanks are connected to a sand mill.

[0074] The pulping section is provided with a pre-grinding pulping line.

[0075] The pre-grinding pulping line is connected to a second feeder at the bottom of a second bin, and the top end of the second feeder is connected to a second material distributor.

[0076] The bottom pre-grinding output pipeline of the vertical sand mill is connected to the pulping tank.

[0077] The bottom pre-grinding output pipeline of the vertical sand mill is provided with a reflux pipe connected to the vertical sand mill.

[0078] The grinding section is provided with a main sand mill, a secondary sand mill and a refining mill.

[0079] The sand mill is a wet horizontal grinding chamber, and the downstream of the slurry pipeline is connected to the feed interface of the sand mill.

[0080] The main sand mill and the secondary sand mill are connected in parallel and run simultaneously or independently.

[0081] The output pipeline of the intermediate tank is connected to the downstream refining mill.

[0082] The refined material pipeline of the refining mill is connected to the downstream storage tank.

[0083] The intermediate section is provided with two groups of intermediate tanks.

[0084] The main sand mill and the secondary sand mill are connected in parallel and run simultaneously or independently.

[0085] Each group of intermediate tanks is provided with a stirring mechanism.

[0086] The bottom output pipelines of the two groups of intermediate tanks are connected to the downstream refining mill.

[0087] The back storage section is provided with two groups of parallel back storage tanks; the refined material pipeline of the refiner is connected to the top of the back storage tank downstream, and the bottom of the back storage tank is connected to the downstream through a process pipeline.

[0088] The bottom process pipelines of the two groups of back storage tanks are merged and connected to the downstream.

[0089] The pulp grinding pipeline of the sand mill, the output pipeline of the intermediate tank, the refined material pipeline of the refiner, and the process pipeline of the back storage tank are each provided with a flow valve and a flow pump for independent control according to the process requirements.

[0090] The sand grinding process of the monazite ore material is based on the sand grinding section production line of the monazite ore material, and the process adopts an alkali wet grinding process:

[0091] The monazite fine ore material is fed into the stock bin, lifted by the elevator, and distributed to the parallel pulp preparation tanks by the material distributor; the pulp preparation tank is provided with a stirring mechanism to stir and dissolve the pulp of the monazite fine ore material.

[0092] The alkali solution in the alkali solution tank is added to the pulp preparation tank to participate in the pulp preparation.

[0093] The pulp in the pulp preparation tank is pumped to the sand mill of the wet horizontal grinding cavity for sand grinding.

[0094] The ground pulp is transported to the intermediate tank, where it is continuously stirred and homogenized; the homogenized pulp is pumped from the bottom of the intermediate tank to the refiner for regrinding, and the regrinded pulp is pumped to the back storage tank for continuous stirring and homogenization, and then transported to the downstream process.

[0095] The alkali solution in the alkali solution tank is delivered to the pulp preparation tank, the intermediate tank, and the back storage tank through flow control.

[0096] The above constitutes a continuous monazite ore material sand grinding process.

[0097] The alkali wet grinding process: directly use alkaline water + monazite to enter the sand mill for ore grinding; during the grinding process, the alkali continuously participates in the chemical reaction with the monazite, and the mixture is uniform; the regrinded pulp is added with sodium hydroxide for stirring and re-reaction; the mixed pulp is pumped to the downstream process under the centrifugal force of the slurry pump.

[0098] The pulp preparation tank, the intermediate tank, the back storage tank, and the alkali solution tank are all fed from the top and discharged from the bottom.

[0099] The monazite ore material sand grinding section production line and its process design have the following characteristics:

[0100] The material distributor divides the material from the top of the screw elevator into one or more pulp preparation tanks; multiple pulp preparation tanks can work in parallel to improve production efficiency and capacity.

[0101] The configuration of multiple pulp tanks can also coordinate the upstream and downstream of the entire process and downstream process, that is, the supply flow of the upstream granular dry material and the downstream pulp quantity.

[0102] Pulping is the mixing of monazite granular material with an appropriate amount of liquid (alkaline water), which makes the monazite particles fully wetted by the liquid and breaks the agglomeration, preparing for subsequent grinding.

[0103] A stirrer is configured in the pulp tank, which continuously operates to make the monazite solid particles uniformly suspended in the liquid, preventing sedimentation and promoting mixing and wetting. The stirrer is selected as a mechanical stirrer.

[0104] Before the coarse grinding sand mill, a parallel set of pulping sections is configured, which includes parallel hoppers, closed air unloader, screw elevator, material distributor, and two-way vertical sand mill downstream. The vertical sand mill outputs slurry, which is merged and transported to the pulp tank, and the pulp in the pulp tank enters the downstream coarse grinding sand mill together with the slurry.

[0105] The sand mill uses the impact, shear, and friction of grinding media (such as zirconium beads, aluminum oxide beads, steel beads, etc.) to perform coarse or medium grinding on monazite particles, significantly reducing the particle size.

[0106] The paddle in the pulp tank is transported to the sand mill for coarse grinding, and the ground slurry with finer particle size is obtained and enters the intermediate tank.

[0107] The fine grinding mill receives the slurry from the intermediate tank and performs higher intensity and finer grinding. Smaller particle size grinding media and more optimized grinding chamber structure are usually used to achieve the final required fineness index.

[0108] The two-stage sand mill in series (coarse grinding + fine grinding) cooperates with the intermediate tank to homogenize the slurry, so that the diameter of the particles in the final slurry reaches sub-micron level or even nanometer level, meeting the purification requirements of high-end minerals.

[0109] The slurry in the intermediate tank is further fine ground by the downstream sand mill to achieve fine monazite slurry with the final target fineness. The intermediate buffer tank eliminates the flow fluctuations between the grinding stages of the coarse grinding and fine grinding sand mills, and the post-storage tank provides buffer for the downstream process.

[0110] The fine ground slurry is transported to the downstream post-storage tank, and after homogenization in the post-storage tank, it is transported to the next process.

[0111] Closed treatment: From the closed air unloader, the control of radioactive mineral dust and the control of airtightness are controlled. From the hopper, the closed air unloader, the material distributor, the pulp tank, the sand mill, the intermediate tank, the post-storage tank, and the downstream process, the entire closed pipeline design completely blocks the escape of radioactive monazite dust, ensuring operation safety and environmental compliance.

[0112] High efficiency conveying: vertical conveying of particles is achieved by using a screw elevator.

[0113] Two-stage grinding: a series connection mode of coarse grinding + fine grinding is adopted to achieve high efficiency operation with high fineness and narrow particle size distribution. The stability of the process and the uniformity of the pulp quality are ensured by the intermediate tank and the rear storage tank.

[0114] Continuous stirring is implemented in each pulp tank: continuous stirring is implemented in the pulp tank and the rear storage tank to prevent sedimentation and ensure process continuity and product quality.

Claims

1. A sanding section production line of monazite ore material, characterized in that The pulp preparation section, the grinding section, the intermediate section, and the post-storage section are included. The structure of the pulp preparation section is that the bottom of the stock bin is connected to the elevator through the closed air discharge device, the top of the elevator is connected to the material distributor downward, and the material distributor is connected to at least two pulp preparation tanks downstream. The tank bottom of the pulp preparation tank is connected to the slurry pipeline. The grinding section is composed of at least one sand mill, the sand mill adopts a wet horizontal grinding cavity, the downstream of the slurry pipeline is connected to the feed interface of the sand mill, and the discharge interface of the sand mill is connected to the grinding pipeline. The intermediate section is composed of at least one intermediate tank, the top of the intermediate tank is connected to the feed, the bottom of the intermediate tank is connected to the discharge, the downstream of the grinding pipeline is connected to the top of the intermediate tank, the output pipeline of the bottom of the intermediate tank is connected to the downstream of the refining mill. The output pipeline of the bottom of the intermediate tank is connected to the downstream of the refining mill. The post-storage section is configured with at least one post-storage tank, the refined material pipeline of the refining mill is connected to the top of the post-storage tank, and the bottom of the post-storage tank is connected to the downstream through the process pipeline.

2. The sand mill production line for monazite ore according to claim 1, wherein the material distributor adopts a bifurcated chute or a gate distributor.

3. The sand mill production line for monazite ore according to claim 1, wherein a back alkali tank is further arranged upstream of the pulp preparation tank, and the back alkali tank is connected to the pulp preparation tank through a back alkali pipeline configured with a flow control valve.

4. The sand mill production line for monazite ore according to claim 1, wherein the pulp preparation tank is configured with two first and second pulp preparation tanks, the slurry pipelines of the two pulp preparation tanks are combined and connected to the sand mill, the pulp preparation tank is configured with a stirring mechanism, and the stirring mechanism is composed of a stirring motor, a stirring shaft, and a stirring paddle.

5. The sand mill production line for monazite ore according to claim 1, wherein the pulp preparation section is provided with a pre-grinding pulp preparation line. The structure of the pre-grinding pulp preparation line is that the bottom of the second stock bin is connected to the second elevator, the top of the second elevator is connected to the second material distributor downward, and the second material distributor is connected to the vertical sand mill downstream. The bottom of the vertical sand mill is connected to the pre-grinding output pipeline downstream. The pre-grinding output pipeline of the vertical sand mill is provided with a backflow pipe connected to the vertical sand mill.

6. The sand mill production line for monazite ore according to claim 1, wherein the grinding section is configured with a main sand mill, an auxiliary sand mill, and a refining mill. The main sand mill and the auxiliary sand mill are connected in parallel, and are simultaneously operated or independently operated in a single group. The grinding pipelines of the main sand mill and the auxiliary sand mill are combined and extended to the downstream intermediate tank. The output pipeline of the intermediate tank is connected to the downstream of the refining mill. The refined material pipeline of the refining mill is connected to the downstream of the post-storage tank.

7. The sand mill production line for monazite ore according to claim 6, wherein the intermediate section is configured with two groups of intermediate tanks. The two groups of intermediate tanks are connected in parallel, and are simultaneously operated or independently operated in a single group. The grinding pipelines of the main sand mill and the auxiliary sand mill are combined and then divided into two pipelines, which are connected to the two groups of intermediate tanks. Each group of intermediate tanks is configured with a stirring mechanism. The bottom output pipelines of the two groups of intermediate tanks are combined and connected to the downstream of the refining mill. ​ ​ ​ ​ 8. The sand grinding section production line of monazite ore material according to claim 1, characterized in that: a rear storage section is configured with two sets of parallel rear storage tanks; the bottom process pipelines of the two sets of rear storage tanks are merged and connected to the downstream.

9. The sanding process of monazite ore according to claim 1, characterized in that: The process is based on the sand grinding section production line of monazite ore material according to any one of claims 1-8, and the process uses an alkali re-wetting grinding process: The monazite fine ore is put into the silo, lifted by the elevator, distributed to the parallel pulp preparation tanks by the material distributor, and the pulp preparation tanks are configured with stirring mechanisms to stir and dissolve the monazite fine ore slurry and prepare the slurry; The alkali liquid in the alkali liquid tank is added to the pulp preparation tank to participate in the preparation of the slurry; The slurry in the pulp preparation tank is pumped to the sand mill of the wet horizontal grinding cavity for sand grinding; The ground pulp is transported to the intermediate tank, where it is continuously stirred and evenly grinded. The stable and evenly grinded slurry is pumped from the bottom of the intermediate tank to the refiner for regrinding. The regrinded slurry is pumped to the rear storage tank for continuous stirring and even gridding, and then transported to the downstream process; The alkali liquid in the alkali liquid tank is delivered to the pulp preparation tank, the intermediate tank, and the rear storage tank through flow control respectively; The above constitutes a continuous monazite ore material sand grinding process.

10. The sand grinding process of monazite ore material according to claim 9, characterized in that: The alkali re-wetting grinding process: directly use alkali water + monazite to enter the sand mill for ore grinding. In the process of ore grinding, the alkali continuously participates in the chemical reaction with the monazite, and the mixture is uniform. The ground ore slurry is added with sodium hydroxide to react and mix again through stirring. The mixed ore slurry is pumped to the downstream process under the centrifugal force of the slurry pump.

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