Ore grinding grading system
By designing overflow orifice plates and overflow inclined pipes in the grinding graded system, small-diameter steel balls are prevented from entering the subsequent equipment, the problems of rough fineness of the graded overflow product and equipment failure are solved, and more efficient grinding effect and production stability are achieved.
Patent Information
- Application Number
- CN202421020718.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-05-11
AI Technical Summary
In the existing grinding graded systems, the fineness of the graded overflow products is relatively coarse, making it difficult to reach the design value, and the small diameter rounded steel ball will cause subsequent equipment failures and affect production stability.
A grinding grading system is designed to communicate with the overflow inclined pipe through the overflow opening of a vertical spiral stirring mill, and the overflow inclined pipe is connected to one end of the overflow box. An overflow orifice plate perpendicular to the direction of the ore flow of the ore slurry is provided in the overflow orifice plate. The diameter of the through holes is one-fifth to one-third of the diameter of the steel ball, and the area of the multiple through holes accounts for 50%-80% of the total area of the overflow orifice plate to prevent the small-diameter steel ball from entering the subsequent equipment.
The fineness of grinding graded overflow products is improved, the effective volume and filling rate of the mill is increased, the grinding effect is enhanced, and small-diameter steel balls are effectively prevented from entering the subsequent equipment, ensuring stable production.
Smart Images
Figure CN222567987U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ore dressing and grinding, in particular to a grinding and classification system. Background Art
[0002] Grinding is the last operation before mineral processing. Its investment accounts for about 60% of the total investment of the mineral processing plant, its power consumption accounts for about 50% to 60% of the mineral processing plant, and its production and operation costs account for more than 40%. It is an important part of the mineral processing process. Improving the fineness of the classified overflow product can effectively improve the subsequent magnetic separation and flotation concentrate product indicators.
[0003] The closed-circuit grinding and classification system in the prior art mainly includes a vertical spiral stirred mill directly connected to a pump pool through an overflow port. The slurry in the pump pool is transported to a cyclone for classification by a slurry pump, and the classified overflow product is then sent to subsequent magnetic separation and flotation treatment.
[0004] However, the above system has the following problems during the production process: (1) The fineness of the overflow product is only -300 mesh, accounting for 89%. Without adding redundant equipment, it is difficult to reach the design value of -300 mesh, accounting for 94%; (2) The smaller diameter out-of-round steel balls in the vertical spiral stirred mill will enter the pump pool and subsequent classification, magnetic separation, flotation and other equipment along with the grinding products, causing equipment failure, affecting and restricting the stable and smooth production. Utility Model Content
[0005] The utility model aims to provide a system capable of improving the fineness of grinding and classification overflow products, solving the problems of coarse fineness of classification overflow products and poor subsequent mineral processing indicators in existing production, while ensuring stable operation of subsequent equipment.
[0006] To achieve the above-mentioned purpose, the technical solution of the utility model is: a grinding and grading system, comprising a vertical spiral stirred mill, the overflow port of the vertical spiral stirred mill is connected to one end of an overflow box through an overflow inclined pipe, an overflow orifice plate perpendicular to the flow direction of the slurry is provided in the overflow box, a plurality of through holes are provided on the overflow orifice plate, and the other end of the overflow box is connected to a pump pool through a discharging device;
[0007] The top of the pump pool is provided with an ore feeding pipe, and the bottom of the pump pool is connected to the cyclone through a slurry pump;
[0008] The sand settling port at the bottom of the cyclone is connected to the feed port at the bottom of the vertical spiral stirring mill;
[0009] Furthermore, an overflow baffle is provided at one end of the overflow orifice plate, and the height of the overflow baffle is not greater than one half of the height of the overflow orifice plate;
[0010] Furthermore, the angle between the overflow inclined pipe and the horizontal plane is in the range of 5°-10°;
[0011] Furthermore, the through holes are circular holes, the diameter of which is one fifth to one third of the diameter of the steel balls added to the vertical spiral stirring mill, and the area of the plurality of circular holes accounts for 50%-80% of the total area of the overflow orifice plate.
[0012] Compared with the prior art, the utility model has the following beneficial effects:
[0013] (1) The overflow liquid level of the vertical spiral stirred mill is increased, the effective volume of the mill is increased, thereby increasing the filling rate of the mill and improving the grinding effect.
[0014] (2) The overflow orifice can effectively prevent small-diameter out-of-round steel balls from entering subsequent process equipment, thus ensuring production operations.
[0015] (3) Relying on existing equipment, the transformation investment is small, mainly for the transformation of overflow pipes and overflow boxes. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A structural diagram for the implementation of the utility model;
[0017] Figure 2 The structure diagram of the overflow orifice plate implemented in the utility model;
[0018] In the figure: 1-vertical spiral stirring mill; 2-overflow inclined pipe; 3-overflow box; 4-discharging device; 5-overflow orifice plate; 6-overflow baffle; 7-pump pool; 8-slurry pump; 9-cyclone; 10-feeding pipe; 11-through hole. DETAILED DESCRIPTION
[0019] In order to further understand the technical means of the utility model and the specific objectives and functions achieved, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0020] like Figure 1 As shown, the utility model is a grinding and classifying system, comprising: a vertical spiral stirred mill 1, the top of the vertical spiral stirred mill 1 is provided with an overflow port, the overflow port is connected with one end of an overflow box 3 through an overflow inclined pipe 2, the overflow box 3 is provided with an overflow orifice plate 5 perpendicular to the flow direction of the slurry, and the overflow orifice plate 5 is provided with a plurality of through holes 11;
[0021] The other end of the overflow box 3 is connected to the pump pool 7 through the discharge device 4; the top of the pump pool 7 is provided with a ore feeding pipe 10, and the bottom of the pump pool 7 is connected to the cyclone 9 through a slurry pump 8; the sand settling port at the bottom of the cyclone 9 is connected to the feed port at the bottom of the vertical spiral stirred mill 1.
[0022] Furthermore, an overflow baffle 6 is provided at one end of the overflow orifice plate 5 , and the height of the overflow baffle 6 is not greater than half of the height of the overflow orifice plate 5 , so as to increase the effective volume of the overflow box 3 .
[0023] Furthermore, the angle between the overflow inclined pipe 2 and the horizontal plane is in the range of 5°-10°.
[0024] Further, such as Figure 2 As shown, the through hole (11) is a circular hole, the diameter of which is one fifth to one third of the diameter of the steel ball added in the vertical spiral stirring mill 1, and the area of the plurality of circular holes accounts for 50% to 80% of the total area of the overflow orifice plate 5.
[0025] The workflow of this utility model is as follows:
[0026] First, steel balls are added to the vertical spiral stirred mill 1, and slurry is added to the pump pool 7 through the ore feeding pipe 10. The slurry is fed into the cyclone 9 through the slurry pump 8 to separate coarse and fine particles. The fine particle slurry is discharged from the overflow port of the cyclone 9, and the coarse particle slurry is fed into the vertical spiral stirred mill 1 from the sand settling port. The vertical spiral stirred mill 1 drives the steel balls to stir and grind the coarse particle slurry. The ground slurry flows into the overflow box 3 through the overflow inclined pipe 2. Since the overflow inclined pipe 2 is arranged at the top of the vertical spiral stirred mill 1, the effective volume of the vertical spiral stirred mill 1 is increased, thereby increasing the filling rate of the vertical spiral stirred mill 1 and improving the grinding effect. The feed end of the overflow inclined pipe 2 is lower than its discharge end, so that the steel balls or other heavy slag in the slurry are not easy to flow out with the slurry under the action of gravity. At the same time, an overflow orifice plate 5 is also provided in the overflow box 3. The through hole 11 on the overflow orifice plate 5 can further prevent the steel balls from entering the subsequent equipment. In addition, an overflow baffle 6 can be provided at the front or rear end of the overflow orifice plate 5 to increase the effective volume of the overflow box 3. The slurry in the overflow box 3 is discharged into the pump pool 7 through the discharge device 4, and the above steps are repeated with the slurry newly fed into the feed pipe 10.
[0027] Through experiments, the utility model can increase the product particle size -300 mesh from 89% to 91% compared with the traditional vertical spiral stirring mill.
[0028] The above embodiment only expresses one implementation method of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.
Claims
1. A grinding and classification system, characterized in that: include: A vertical spiral stirring mill (1), wherein the overflow port of the vertical spiral stirring mill (1) is connected to one end of an overflow box (3) through an overflow inclined pipe (2), an overflow orifice plate (5) perpendicular to the flow direction of the mineral powder is provided in the overflow box (3), and a plurality of through holes (11) are provided on the overflow orifice plate (5); The other end of the overflow box (3) is connected to the pump pool (7) through the discharge device (4); the top of the pump pool (7) is provided with an ore feeding pipe (10); the bottom of the pump pool (7) is connected to the cyclone (9) through a slurry pump (8); The sand settling port at the bottom of the cyclone (9) is communicated with the feed port at the bottom of the vertical spiral stirring mill (1).
2. The grinding and classifying system according to claim 1, characterized in that: An overflow baffle (6) is provided at one end of the overflow orifice plate (5), and the height of the overflow baffle (6) is no greater than half of the height of the overflow orifice plate (5).
3. The grinding and classifying system according to claim 2, characterized in that: The angle between the overflow inclined pipe (2) and the horizontal plane is in the range of 5°-10°.
4. The grinding and classifying system according to claim 3, characterized in that: The through holes (11) are circular holes, the diameter of which is one fifth to one third of the diameter of the out-of-round steel balls added to the vertical spiral stirring mill (1), and the area of the plurality of circular holes accounts for 50% to 80% of the total area of the overflow orifice plate (5).