Slurry making system and high-pressure roller grinding wet-type closed-loop screening system

Abstract

The utility model discloses a slurry making system which comprises an upper soaking section, a middle material distributing section and a lower slurry making section which are sequentially arranged from top to bottom, a primary high-pressure flushing assembly is arranged in the upper soaking section, an outlet of the upper soaking section is connected with an inlet of the middle material distributing section, a plurality of material distributing plates are arranged in the middle material distributing section, and the lower slurry making section is connected with the primary high-pressure flushing assembly. An outlet of the middle material distribution section is connected with an inlet of the lower slurry making section, a secondary high-pressure flushing assembly is arranged in the lower slurry making section, and an overflow weir used for overflowing and discharging materials to the classifying screen is arranged at an outlet of the lower slurry making section. The utility model further provides a high-pressure roller grinding wet type closed-loop screening system. According to the utility model, a method of making slurry by using natural height difference and water pressure is utilized, so that a high-pressure roller grinding material cake is fully wetted and scattered, and materials are uniformly fed into the classifying screen through the overflow weir, so that the classifying effect and the screening efficiency are improved.

Description

Technical Field

[0001] The utility model belongs to the field of ore dressing equipment, in particular to a mineral crushing and screening system. Background Art

[0002] As a superfine crushing equipment, high pressure roller mill equipment has been widely used in the mineral processing industry. It often forms a closed-circuit ore crushing cycle with the grading screen. When the high pressure roller mill and the ball mill have the same working system, wet closed-circuit screening is often used (see Figure 1 ). Compared with dry screening, wet screening is conducive to loosening materials and improving grading efficiency. However, because the high-pressure roller abrasive cake is compact and easy to agglomerate, the material reaches the screen surface in piles and cannot be dispersed and evenly distributed in the screen width direction. Even if the material is dispersed by spraying water on the rear end screen, it is impossible to evenly distribute the material along the screen width at the screen feed end, thereby affecting the screening efficiency and losing the screening area at the screen feed end. In addition, since the high-pressure roller mill has strict requirements on the feeding conditions, in severe cases, it not only affects the screening efficiency, but also causes excessive fine particle content and excessive moisture content in the material on the screen, affecting the normal production and operation of the high-pressure roller mill.

[0003] Therefore, a solution is urgently needed to address the problem that the feed in the above-mentioned high-pressure roller mill wet closed-circuit screening system is compacted and concentrated into piles, and cannot be evenly distributed along the screen width, resulting in reduced screening efficiency and even affecting the normal production and operation of the high-pressure roller mill. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies and defects mentioned in the above background technology and provide a pulping system and a high-pressure roller mill wet closed-circuit screening system, which have the advantages of high screening efficiency and good screening and grading effect.

[0005] In order to solve the above technical problems, the technical solution proposed by the utility model is:

[0006] A pulping system comprises an upper soaking section, a middle distribution section and a lower pulping section which are arranged in sequence from top to bottom, wherein a primary high-pressure water flushing component is provided in the upper soaking section, the outlet of the upper soaking section is connected to the inlet of the middle distribution section, a plurality of material distribution plates are provided in the middle distribution section, the outlet of the middle distribution section is connected to the inlet of the lower pulping section, a secondary high-pressure water flushing component is provided in the lower pulping section, and an overflow weir is provided at the outlet of the lower pulping section for discharging overflow material onto a grading screen.

[0007] In the above pulping system, preferably, a retaining edge for overflow discharge is provided at the outlet of the upper soaking section.

[0008] In the above-mentioned pulping system, preferably, the length direction of the middle distribution section is a trumpet shape that is narrow at the top and wide at the bottom, the length direction of the middle distribution section is the screen width direction of the grading screen, and the material distribution plate is arranged on the length direction side plate of the middle distribution section on the side close to the outlet of the upper soaking section, and the number of the material distribution plates increases from top to bottom.

[0009] In the above pulping system, preferably, the material distribution plate is an angle steel vertically arranged on the side plate in the length direction of the middle material distribution section, and the intersection lines of the two sides of the angle steel are kept upward.

[0010] In the above pulping system, preferably, the width direction of the middle cloth section is in a trumpet shape that is wider at the top and narrower at the bottom.

[0011] In the above pulping system, preferably, the length direction of the overflow weir is the screen width direction of the grading screen, and the length of the overflow weir matches the screen width of the grading screen. The length of the overflow weir matches the screen width of the grading screen, so that the slurry in the lower pulping section can be evenly distributed on the grading screen, thereby improving the screening efficiency.

[0012] In the above pulping system, preferably, the overflow weir includes an upper baffle, a lower baffle and an overflow distribution plate, the upper baffle is arranged above the lower baffle, the overflow distribution plate is arranged obliquely, the upper edge of the overflow distribution plate is connected to the upper edge of the lower baffle, and the lower edge of the overflow distribution plate is arranged above the grading screen. The lower baffle cooperates with the secondary high-pressure flushing assembly evenly distributed on the right side, and the material is completely broken up under the action of turbulence and forms a stable solid-liquid two-phase slurry, and then the stable solid-liquid two-phase slurry can be evenly overflowed onto the grading screen through the inclined overflow distribution plate; the upper baffle is mainly used to prevent material splashing.

[0013] In the above-mentioned pulping system, preferably, the primary high-pressure flushing component and the secondary high-pressure flushing component both include nozzles for providing high-pressure flushing, the nozzle of the primary high-pressure flushing component is located on the side away from the outlet of the upper soaking section, and the nozzle of the secondary high-pressure flushing component is located on the side away from the outlet of the lower pulping section.

[0014] As a general technical concept, the utility model also provides a high-pressure roller mill wet closed-circuit screening system, including a high-pressure roller mill, a grading screen, a feed belt, a return belt and the above-mentioned pulping system, the discharge end of the high-pressure roller mill is connected to the inlet of the upper soaking section through the feed belt, and the upper part of the grading screen is connected to the high-pressure roller mill through the return belt.

[0015] The slurry making system of the utility model utilizes the principle of natural height difference and water pressure slurry making, and cooperates with high-pressure water flushing to soak and break up the material cake twice, and evenly distribute the material in the lower slurry making section, and then flows into the grading screen by gravity through the overflow weir, so as to achieve full soaking and breaking up of the material cake and uniform distribution in the screen width direction, thereby greatly improving the screening operation effect. Specifically, the specific composition and functions of the upper soaking section, the middle material distribution section and the lower slurry making section are as follows:

[0016] (1) Upper soaking section: The discharge material (compacted cake) from the high-pressure roller mill is fed into the upper soaking section through a feeding belt (belt conveyor). This section is funnel-shaped and has a 300 mm retaining edge. It has the function of caching materials. Under the action of a high-pressure water flushing component, the cake is initially soaked and broken up.

[0017] (2) Middle distribution section: The initially soaked and scattered materials enter the middle distribution section under the action of gravity and impact water pressure. This section is funnel-shaped and has a bell-shaped shape from top to bottom. Four layers of 100-type angle steels are set from top to bottom in the funnel, with a height of 100-150mm. The number of angle steels in each layer increases successively, which serves as a material distribution plate. The materials are further scattered under the action of gravity and distributed along the bell-shaped shape toward the screen width.

[0018] (3) Lower slurry section: The further dispersed materials fall into the lower slurry section. With the secondary high-pressure water flushing, the materials are completely dispersed under the action of turbulence and form a stable solid-liquid two-phase slurry. This section is designed as a rectangular structure with a width of 1.5 mm and a length that matches the screen width to facilitate uniform feeding. This section is equipped with an overflow weir, including an upper baffle, a lower baffle and an overflow distribution plate. The upper baffle is mainly used to prevent material splashing and slurry material overflowing into the grading screen. The material is fully soaked and dispersed in the lower slurry section, and the overflow is evenly distributed in the screen width direction through the overflow distribution plate, thereby greatly improving the screening efficiency, making full use of the screening area, and improving the screening effect.

[0019] The utility model adopts a pulping system with a unique structure, using the natural height difference and water pressure to make pulp, and using the height difference between the tape head wheel and the screen surface and the water pressure to make the material roll in the pulping tank to the entire screen surface, so that the high-pressure roller abrasive cake is fully soaked and broken up, and the material is evenly fed into the grading screen along the screen width through the overflow weir, thereby improving the grading effect and screening efficiency, and solving the pain points of low grading efficiency and poor grading effect caused by compacted cake and uneven distribution during the closed-circuit screening process of the high-pressure roller mill. The specific analysis is as follows:

[0020] The high-pressure roller abrasive cake is usually compact and easy to clump, which is not conducive to screening, and the cake needs to be fully broken up. The utility model makes full use of the gravity and water pressure impact of the natural height difference of the plant configuration to save the energy required for breaking up the material. Without adding power equipment, only a unique structure of the pulping system design is adopted. Under the action of gravity and water pressure, the material is broken up and evenly distributed. The production operation is simple and the energy-saving effect is significant.

[0021] When the belt is fed directly, the material cannot be evenly distributed in the screen width direction due to the narrow belt surface and wide screen surface. Under the action of the drop gravity and the impact water pressure, the utility model adopts a pulping system design with a unique structure. The material is fully soaked under the action of two pulping processes, so that the high-pressure roller abrasive cake is fully soaked and scattered. Through a simple material distribution plate, the material is effectively evenly distributed along the screen width direction, improving the efficiency of material dispersion. In combination with the high-pressure water flushing component, the material can form a relatively stable solid-liquid two-phase slurry under the action of turbulence, creating conditions for the material to be evenly distributed in the screen width direction, and can enter the grading screen in a uniformly distributed state in the screen width direction, thereby improving the efficiency of subsequent grading operations. Due to the improvement in screening efficiency, compared with conventional designs, the screening area is saved, thereby reducing equipment and plant investment, and having better economic benefits.

[0022] Since the high-pressure roller mill has strict requirements on feeding conditions, when the fine-particle content of the material on the screen is too high and the moisture content is too high, it will affect the normal production and operation of the high-pressure roller mill. Under the action of the drop gravity and the impact water pressure, the utility model allows the material to have enough buffering and soaking space, and does not cause the material to be deposited at the bottom of the pulping system. The material is fully soaked under the action of two pulping processes, so that the high-pressure roller abrasive cake is fully soaked and broken up, and the material is evenly fed into the grading screen through the overflow weir, thereby improving the grading effect, solving the technical defects of poor screening effect in the wet closed-circuit screening process of the high-pressure roller mill, which is not conducive to the operation of the high-pressure roller mill, and providing a strong guarantee for the normal production of the high-pressure roller mill.

[0023] Compared with the prior art, the advantages of the utility model are:

[0024] The slurry making system and high-pressure roller mill wet closed-circuit screening system of the utility model utilize the natural height difference and water pressure slurry making method to fully wet and break up the high-pressure roller mill material cake, and evenly feed the material into the grading screen through the overflow weir, thereby improving the grading effect and screening efficiency, solving the problems of low grading efficiency and poor grading effect caused by compacted material cake and uneven material distribution in the closed-circuit screening process of the high-pressure roller mill, and ensuring the normal production operation of the high-pressure roller mill operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a schematic diagram of the structure of wet closed-circuit screening.

[0027] Figure 2 The schematic diagram of the structure of the high pressure roller mill wet closed circuit screening system in the embodiment (the grading screen and Figure 3 The grading screens are all suitable for the utility model).

[0028] Figure 3 It is a front view of the pulping system in the embodiment.

[0029] Figure 4 It is a side view of the pulping system in the embodiment.

[0030] Legend

[0031] 1. Upper soaking section; 2. Middle distribution section; 3. Lower pulping section; 4. Primary high-pressure water flushing assembly; 5. Material distribution plate; 6. Secondary high-pressure water flushing assembly; 7. Overflow weir; 71. Upper baffle; 72. Lower baffle; 73. Overflow distribution plate; 8. Grading screen; 9. High-pressure roller mill; 10. Feeding belt; 11. Baffle edge; 12. Return belt. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and carefully below in conjunction with the accompanying drawings and preferred embodiments of the specification, but the protection scope of the present invention is not limited to the following specific embodiments.

[0033] It should be noted that when an element is described as being "fixed, fixed, connected or connected to" another element, it can be directly fixed, fixed, connected or connected to the other element, or it can be indirectly fixed, fixed, connected or connected to the other element through other intermediate connectors.

[0034] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present utility model.

[0035] Example:

[0036] like Figure 3 and Figure 4As shown, the pulping system of this embodiment includes an upper soaking section 1, a middle distribution section 2 and a lower pulping section 3 which are arranged in sequence from top to bottom, a primary high-pressure water flushing component 4 is provided in the upper soaking section 1, the outlet of the upper soaking section 1 is connected to the inlet of the middle distribution section 2, a plurality of material distribution plates 5 are provided in the middle distribution section 2, the outlet of the middle distribution section 2 is connected to the inlet of the lower pulping section 3, a secondary high-pressure water flushing component 6 is provided in the lower pulping section 3, and an overflow weir 7 for overflowing material onto a grading screen 8 is provided at the outlet of the lower pulping section 3.

[0037] Specifically, in this embodiment, a retaining edge 11 for overflow discharge is provided at the outlet of the upper soaking section 1, and the height of the retaining edge 11 may be 300 mm.

[0038] In this embodiment, the length direction of the middle cloth section 2 is a trumpet-shaped shape that is narrow at the top and wide at the bottom, and the width direction of the middle cloth section 2 is a trumpet-shaped shape that is wide at the top and narrow at the bottom. The length direction of the middle cloth section 2 is the screen width direction of the grading screen 8, and the material distribution plate 5 is arranged on the length direction side plate of the middle cloth section 2 on the side close to the outlet of the upper soaking section 1, and the number of material distribution plates 5 increases from top to bottom.

[0039] In this embodiment, the material distribution plate 5 is an angle steel vertically arranged on the lengthwise side plate of the middle material distribution section 2, and the intersection lines of the two sides of the angle steel are kept upward. Specifically, in this embodiment, 4 layers of 100-type angle steels can be arranged from top to bottom, with a height of 100-150mm.

[0040] In this embodiment, the length direction of the overflow weir 7 is the screen width direction of the grading screen 8 , and the length of the overflow weir 7 matches the screen width of the grading screen 8 .

[0041] In this embodiment, the overflow weir 7 includes an upper baffle 71, a lower baffle 72 and an overflow distribution plate 73. The upper baffle 71 is arranged above the lower baffle 72, the overflow distribution plate 73 is arranged at an angle, the upper edge of the overflow distribution plate 73 is connected to the upper edge of the lower baffle 72, and the lower edge of the overflow distribution plate 73 is arranged above the grading screen 8.

[0042] In this embodiment, the primary high-pressure flushing component 4 and the secondary high-pressure flushing component 6 both include nozzles for providing high-pressure flushing. The nozzle of the primary high-pressure flushing component 4 is located on the side away from the outlet of the upper immersion section 1, and the nozzle of the secondary high-pressure flushing component 6 is located on the side away from the outlet of the lower pulping section 3.

[0043] like Figure 2 As shown, the high-pressure roller mill wet closed-circuit screening system of this embodiment includes a high-pressure roller mill 9, a grading screen 8, a feeding belt 10, a return belt 12 and the above-mentioned pulping system. The discharge end of the high-pressure roller mill 9 is connected to the inlet of the upper soaking section 1 through the feeding belt 10, and the upper part of the grading screen 8 is connected to the high-pressure roller mill 9 through the return belt 12.

[0044] The pulping system and the high-pressure roller mill wet closed-circuit screening system of this embodiment utilize the natural height difference and water pressure pulping method to fully wet and break up the high-pressure roller mill material cake, and evenly feed the material into the grading screen 8 through the overflow weir 7, thereby improving the grading effect and screening efficiency, and solving the problems of low grading efficiency and poor grading effect caused by compacted material cake and uneven material distribution during the closed-circuit screening process of the high-pressure roller mill, thereby ensuring the normal production operation of the high-pressure roller mill operation.

[0045] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A pulping system, characterized in that: The invention comprises an upper soaking section (1), a middle material distribution section (2) and a lower pulping section (3) which are arranged in sequence from top to bottom, wherein the upper soaking section (1) is provided with a primary high-pressure water flushing component (4), the outlet of the upper soaking section (1) is connected to the inlet of the middle material distribution section (2), the middle material distribution section (2) is provided with a plurality of material distribution plates (5), the outlet of the middle material distribution section (2) is connected to the inlet of the lower pulping section (3), the lower pulping section (3) is provided with a secondary high-pressure water flushing component (6), and the outlet of the lower pulping section (3) is provided with an overflow weir (7) for overflowing and discharging material onto a grading screen (8).

2. The pulping system according to claim 1, characterized in that: A retaining edge (11) for overflow discharge is provided at the outlet of the upper soaking section (1).

3. The pulping system according to claim 1, characterized in that: The length direction of the middle material distribution section (2) is in the shape of a trumpet that is narrow at the top and wide at the bottom. The length direction of the middle material distribution section (2) is the screen width direction of the grading screen (8). The material distribution plates (5) are arranged on the length direction side plates of the middle material distribution section (2) on the side close to the outlet of the upper soaking section (1). The number of the material distribution plates (5) increases from top to bottom.

4. The pulping system according to claim 3, characterized in that: The material distribution plate (5) is an angle steel vertically arranged on the side plate in the length direction of the middle material distribution section (2), and the intersection lines of the two sides of the angle steel are kept upward.

5. The pulping system according to claim 3, characterized in that: The width direction of the middle fabric section (2) is in the shape of a trumpet that is wider at the top and narrower at the bottom.

6. The pulping system according to claim 1, characterized in that: The length direction of the overflow weir (7) is the screen width direction of the grading screen (8), and the length of the overflow weir (7) matches the screen width of the grading screen (8).

7. The pulping system according to claim 1, characterized in that: The overflow weir (7) comprises an upper baffle (71), a lower baffle (72) and an overflow distribution plate (73), wherein the upper baffle (71) is arranged above the lower baffle (72), the overflow distribution plate (73) is arranged obliquely, the upper edge of the overflow distribution plate (73) is connected to the upper edge of the lower baffle (72), and the lower edge of the overflow distribution plate (73) is arranged above the grading screen (8).

8. The pulping system according to any one of claims 1 to 7, characterized in that: The primary high-pressure water flushing component (4) and the secondary high-pressure water flushing component (6) both comprise nozzles for providing high-pressure water flushing, the nozzle of the primary high-pressure water flushing component (4) being located on a side away from the outlet of the upper soaking section (1), and the nozzle of the secondary high-pressure water flushing component (6) being located on a side away from the outlet of the lower pulping section (3).

9. A high pressure roller mill wet closed circuit screening system, characterized in that: The pulping system comprises a high-pressure roller mill (9), a grading screen (8), a feeding belt (10), a returning belt (12) and any one of claims 1 to 8, wherein the discharge end of the high-pressure roller mill (9) is connected to the inlet of the upper soaking section (1) via the feeding belt (10), and the upper part of the grading screen (8) is connected to the high-pressure roller mill (9) via the returning belt (12).

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