Grading concentration method for ore containing more fine-fraction slime
By using screening equipment with 1-2mm screen hole size and multi-stage grading dewatering system in the iron ore ore process, the problems of insufficient processing capacity of the ball mill and low cyclone grading efficiency are solved, and stable feeding volume and energy reduction are achieved The effect of consumption and improving grading efficiency.
Patent Information
- Application Number
- CN202411542190.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-01-03
AI Technical Summary
In the existing iron ore ore ore dressing process, the ball mill has limited processing capacity and high energy consumption, resulting in unstable grinding capacity, frequent over-pulverization, and low cyclone grading efficiency, affecting energy utilization efficiency and output.
The screening equipment with a size of 1-2mm screen holes is used to screen ore mud to reduce the problem of unstable feed volume of the ball mill, and the concentration is rated and concentrated through a multi-stage grading dewatering system, and the dehydration treatment is used for different particle grades to reduce the grinding Mine system processing volume and energy consumption.
The stability of the feed volume of the ball mill is achieved, over-milling phenomenon is reduced, the cyclone classification efficiency is improved, the energy consumption of the ore dressing plant is reduced, the output is ensured, and the reasonable distribution and dehydration of mineral mud of different particle grades is achieved. .
Smart Images
Figure CN119237144A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of ore dressing technology, in particular to a classification and concentration method for ores containing more fine-grained ore mud. Background Art
[0002] At present, in some iron ore beneficiation production processes, the beneficiation process for ore is mainly divided into three stages, namely, washing + classification concentration + flotation process. First, the products after crushing and washing are preliminarily screened with a 3-5mm dewatering screen, the products on the screen enter the ball mill, and the products under the screen are concentrated and enter the cyclone for classification.
[0003] At present, this iron ore beneficiation process has the following disadvantages: Due to the limited processing capacity and high energy consumption of the ball mill, the washing section is only open during certain periods of time. Therefore, the ball mill feed is unstable, which makes the ball mill's grinding capacity not fully utilized for a period of time, and easily leads to over-crushing problems, which is not conducive to improving energy efficiency. When the washing section is turned on, the sludge under the washing screen is concentrated and fed into the cyclone. The sludge is fine and will increase the cyclone processing capacity, making the cyclone classification quality efficiency low. Summary of the invention
[0004] The purpose of the present invention is to provide a grading and concentration method for ores containing a large amount of fine-grained ore mud in view of the above situation. The inventive method reduces the processing capacity of the grinding system, ensures the output while reducing the energy consumption of the ore dressing plant, and realizes the dehydration of ore muds of different particle sizes and the rational allocation of resources.
[0005] The specific scheme of the present invention is: a classification and concentration method for ores containing a large amount of fine-grained ore mud, comprising the following steps: (1) After washing the -65mm product, the mass concentration of the ore mud is 70% to 80%, and the proportion of -25mm ore is more than 90%. The ore mud is screened with a screening device with a sieve size of 1 to 2 mm to obtain an oversize material A with a mass concentration of 85% to 95% and an undersize material B with a mass concentration of 50% to 60%; (2) The undersize material B is transported to the classifier in the primary grading and dehydration system for grading and concentration. The overflow C of the classifier has a mass concentration of 40% to 50% and the proportion of -0.35 mm ore is more than 90%. The sand D of the classifier has a mass concentration of 70% to 85% and the proportion of +0.35 mm ore is more than 90%. After the sand D of the classifier is concentrated by the concentration equipment, the mass concentration of the concentrated product E is 85% to 90%. The overflow with a mass concentration of 10% to 20% is returned to the classifier of the primary grading and dehydration system to participate in the grading cycle. (3) The overflow C of the classifier of the primary grading and dehydration system is transported to the classifier of the secondary grading and dehydration system for grading and concentration. The mass concentration of the overflow F of the classifier of the secondary grading and dehydration system is 20% to 30% and the proportion of -0.10 mm ore is more than 90%. The mass concentration of the classifier sediment G is 75% to 85% and the proportion of +0.10 mm ore is more than 90%. After the classifier sediment G is concentrated by the concentration equipment, the mass concentration of the concentrated product H is 85% to 90%. The overflow with a mass concentration of 10% to 20% is returned to the classifier of the secondary grading and dehydration system to participate in the grading cycle. (4) The overflow F from the secondary grading and dehydration system is transported to the tertiary grading and dehydration system for grading and concentration. The overflow I from the tertiary grading and dehydration system has a mass concentration of 5% to 10% and the proportion of -0.01 mm ore is more than 90%, and directly enters the tailings treatment system; the mass concentration of the sand J from the grading machine is 65% to 75%; (5) The concentrated products E and H in the primary and secondary grading and dehydration systems and the sand settling G in the tertiary grading and dehydration system enter the filter for dehydration. The moisture content of the dehydrated product K is below 10%. The dehydrated product K and the material A on the screen enter the ball mill bin for storage.
[0006] Furthermore, in step (1) of the present invention, the ore washing equipment is a drum ore washer or a wheel sand washer; the ore mud after water washing is transported to the screening equipment, and the conveying equipment is a screw conveyor or a slurry pump; the screening equipment is a vibrating linear dewatering screen or a cylindrical screen.
[0007] Furthermore, in step (2) of the present invention, the transport method of the material B under the transport screen is belt transport or screw conveyor transport; the classifier of the primary grading and dehydration system uses a mud bucket or a high weir double-screw classifier; the concentration equipment in the primary grading and dehydration system uses a vibrating dehydration screen, and the slurry pump is used to lift the material under the dehydration screen and return it to the classifier of the primary grading and dehydration system through a pipeline to participate in the grading cycle.
[0008] Furthermore, in step (3) of the present invention, the overflow C of the classifier of the primary grading and dehydration system is transported by pipeline and transported to the spiral classifier or the grading box of the secondary grading and dehydration system below; the concentration equipment in the secondary grading and dehydration system uses a vibrating dehydration screen, and the material under the screen is lifted by a slurry pump and returned to the classifier of the secondary grading and dehydration system through a pipeline to participate in the grading cycle.
[0009] Furthermore, in step (4) of the present invention, the overflow F of the classifier of the secondary grading and dehydration system is transported by pipeline and transported to the classifier of the tertiary grading and dehydration system below, and the classifier is a hydrocyclone; the ratio of the diameter of the hydrocyclone to the diameter of the overflow pipe is 3.66 to 2.75, and the feed pressure is 0.04 to 0.15 MPa.
[0010] Furthermore, in step (5) of the present invention, the primary, secondary and tertiary dehydration systems are arranged from high to low, and the dehydrated products E and H of the concentration equipment and the cyclone sedimentation g are transported to the filter by pipeline through the height difference for dehydration, or are placed on the same plane and transported to the filter step by step by a slurry pump; the filter uses a ceramic vacuum filter or a plate and frame pressure filter, and the moisture content of the obtained filter cake product is less than 10%; the transport equipment for transporting the dehydrated product K and the screened material A to the ball mill is a belt conveyor.
[0011] The beneficial effects of the present invention are: (1) In the current iron ore process, the ore mud after washing passes through the dewatering screen with a mesh size of 3-5 mm. After using a dewatering screen with a mesh size of 1-2 mm, the ore under the screen is dehydrated and stored in the ball mill bin. The ball mill feed rate tends to be stable, the grinding capacity can be fully utilized, the over-crushing phenomenon is reduced, and the energy utilization efficiency is improved; the cyclone feed rate is balanced and the cyclone classification efficiency is improved.
[0012] (2) A three-stage dehydration system is adopted, and different equipment is used to dehydrate products of different particle sizes. The tailings with lower particle sizes are transported to the tailings treatment system, which reduces the processing capacity of the grinding system. While reducing the energy consumption of the ore dressing plant, the output is guaranteed, and the dehydration of sludge of different particle sizes and the rational allocation of resources are achieved. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the specific implementation process of the present invention. DETAILED DESCRIPTION
[0014] The following will be combined with the accompanying drawings of the present invention to clearly and completely describe the technical solution of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.
[0015] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0016] The present invention is a classification and concentration method for ores containing a large amount of fine-grained ore mud, comprising the following steps: (1) After washing the -65mm product, the mass concentration of the ore mud is 70% to 80%, and the proportion of -25mm ore is more than 90%. The ore mud is screened with a screening device with a sieve size of 1 to 2 mm to obtain an oversize material A with a mass concentration of 85% to 95% and an undersize material B with a mass concentration of 50% to 60%; (2) The undersize material B is transported to the classifier in the primary grading and dehydration system for grading and concentration. The overflow C of the classifier has a mass concentration of 40% to 50% and the proportion of -0.35 mm ore is more than 90%. The sand D of the classifier has a mass concentration of 70% to 85% and the proportion of +0.35 mm ore is more than 90%. After the sand D of the classifier is concentrated by the concentration equipment, the mass concentration of the concentrated product E is 85% to 90%. The overflow with a mass concentration of 10% to 20% is returned to the classifier of the primary grading and dehydration system to participate in the grading cycle. (3) The overflow C of the classifier of the primary grading and dehydration system is transported to the classifier of the secondary grading and dehydration system for grading and concentration. The mass concentration of the overflow F of the classifier of the secondary grading and dehydration system is 20% to 30% and the proportion of -0.10 mm ore is more than 90%. The mass concentration of the classifier sediment G is 75% to 85% and the proportion of +0.10 mm ore is more than 90%. After the classifier sediment G is concentrated by the concentration equipment, the mass concentration of the concentrated product H is 85% to 90%. The overflow with a mass concentration of 10% to 20% is returned to the classifier of the secondary grading and dehydration system to participate in the grading cycle. (4) The overflow F from the secondary grading and dehydration system is transported to the tertiary grading and dehydration system for grading and concentration. The overflow I from the tertiary grading and dehydration system has a mass concentration of 5% to 10% and the proportion of -0.01 mm ore is more than 90%, and directly enters the tailings treatment system; the mass concentration of the sand J from the grading machine is 65% to 75%; (5) The concentrated products E and H in the primary and secondary grading and dehydration systems and the sand settling G in the tertiary grading and dehydration system enter the filter for dehydration. The moisture content of the dehydrated product K is below 10%. The dehydrated product K and the material A on the screen enter the ball mill bin for storage.
[0017] Furthermore, in step (1) described in this embodiment, the ore washing equipment is a drum ore washing machine or a wheel sand washing machine; the ore mud after water washing is transported to the screening equipment, and the conveying equipment is a screw conveyor or a slurry pump; the screening equipment is a vibrating linear dewatering screen or a cylindrical screen.
[0018] Furthermore, in step (2) of the present embodiment, the transport method of the material B under the transport screen is belt transport or screw conveyor transport; the classifier of the primary grading and dehydration system uses a mud bucket or a high weir type double screw classifier; the concentration equipment in the primary grading and dehydration system uses a vibrating dehydration screen, and the slurry pump is used to lift the material under the dehydration screen and return it to the classifier of the primary grading and dehydration system through a pipeline to participate in the grading cycle.
[0019] Furthermore, in step (3) described in this embodiment, the overflow C of the classifier of the first-level grading and dehydration system is transported by pipeline and transported to the spiral classifier or grading box of the second-level grading and dehydration system below; the concentration equipment in the second-level grading and dehydration system uses a vibrating dehydration screen, and the material under the screen is lifted by a slurry pump and returned to the classifier of the second-level grading and dehydration system through a pipeline to participate in the grading cycle.
[0020] Furthermore, in step (4) described in this embodiment, the overflow F of the classifier of the secondary classification and dehydration system is transported by pipeline and transported to the classifier of the tertiary classification and dehydration system below, and the classifier is a hydrocyclone; the ratio of the diameter of the hydrocyclone to the diameter of the overflow pipe is 3.66-2.75, and the feed pressure is 0.04-0.15 MPa.
[0021] Furthermore, in step (5) described in this embodiment, the primary, secondary and tertiary dehydration systems are arranged from high to low, and the dehydrated products E and H of the concentration equipment and the cyclone sedimentation G are transported to the filter by pipeline through the height difference for dehydration, or are placed on the same plane and transported to the filter step by step by a slurry pump; the filter uses a ceramic vacuum filter or a plate and frame pressure filter, and the moisture content of the obtained filter cake product is less than 10%; the transportation equipment for transporting the dehydrated product K and the screened material A to the ball mill is a belt conveyor.
[0022] The following is combined with Figure 1 The embodiments of the present invention are described in detail.
[0023] (1) The washed ore mud of -25mm is screened with a vibrating dewatering screen with a mesh size of 2mm. The washed ore mud is transported to the vibrating dewatering screen by a screw conveyor to obtain an oversize material A with a mass concentration of 85% to 95% and an undersize material B with a mass concentration of 50% to 60%.
[0024] (2) The undersize material B is transported to the high weir double spiral classifier of the primary grading and dehydration system by a screw conveyor for dehydration. The mass concentration of the overflow C of the spiral classifier is 40% to 50% and the proportion of -0.35mm ore is more than 90%. The mass concentration of the classifier sediment D is 70% to 85% and the proportion of +0.35mm ore is more than 90%. The sediment of the classifier passes through a 0.5mm vibrating dehydration screen, and the mass concentration of the concentrated product E on the screen is 85% to 90%. The undersize material with a mass concentration of 10% to 20% is returned to the high weir double spiral classifier of the primary grading and dehydration system through a pipeline to participate in the grading cycle.
[0025] (3) The overflow C of the high weir double spiral classifier of the primary grading and dehydration system is transported to the spiral classifier of the secondary grading and dehydration system through a pipeline. The spiral classifier uses a submerged single spiral classifier. The overflow F of the submerged spiral classifier of the secondary grading and dehydration system has a mass concentration of 20% to 30% and the proportion of -0.10mm ore is more than 90%. The mass concentration of the classifier sediment G is 75% to 85% and the proportion of +0.10mm ore is more than 90%. The classifier sediment passes through a 0.15mm vibrating dehydration screen, and the mass concentration of the screen H is 85% to 90%. The underscreen material with a mass concentration of 10% to 20% is returned to the spiral classifier of the secondary grading and dehydration system through a pipeline to participate in the grading cycle.
[0026] (4) The overflow F of the submerged spiral classifier in the secondary classification and dehydration system is transported to the hydrocyclone of the tertiary classification and dehydration system through a pipeline. The ratio of the diameter of the hydrocyclone to the diameter of the overflow pipe is 3.66-2.75, and the feed pressure is 0.04-0.15 MPa. The overflow I of the hydrocyclone with a mass concentration of 5%-10% and a proportion of -0.01 mm ore of more than 95% directly enters the tailings treatment system, and the mass concentration of the hydrocyclone sedimentation G is 65%-75%.
[0027] (5) The primary, secondary and tertiary dehydration systems are arranged from high to low. The undersize products E, H and cyclone grit G are transported to the ceramic filter by pipeline through the height difference for dehydration. They can also be placed on the same plane and transported to the ceramic filter by a slurry pump. The moisture content of the obtained filter cake product is less than 10%, and the filtrate is used as supplementary water to enter the No. 1 ball mill; the dehydrated product K and the oversize material A are transported to the ball mill by a belt conveyor.
[0028] In the current iron ore process, the ore mud after washing passes through the dewatering screen with a mesh size of 3-5mm. After using the dewatering screen with a mesh size of 1-2mm, the ore under the screen is dehydrated and stored in the ball mill ore bin. The ball mill feed rate tends to be stable, the grinding capacity can be fully utilized, the over-crushing phenomenon is reduced, and the energy utilization efficiency is improved; the cyclone feed rate is balanced and the cyclone classification efficiency is improved. A three-level classification dewatering system is adopted, and different equipment is used for dehydration of different particle size products. The tailings with lower particle size are transported to the tailings treatment system, which reduces the processing capacity of the grinding system, reduces the energy consumption of the ore dressing plant while ensuring the output, and realizes the dehydration of ore muds of different particle sizes and the rational allocation of resources.
Claims
1. A method for classifying and concentrating an ore containing a large amount of fine-grained ore mud, characterized in that: The following steps are involved: (1) After washing the -65mm product, the mass concentration of the ore mud is 70% to 80%, and the proportion of -25mm ore is more than 90%. The ore mud is screened with a screening device with a sieve size of 1 to 2 mm to obtain an oversize material A with a mass concentration of 85% to 95% and an undersize material B with a mass concentration of 50% to 60%; (2) The undersize material B is transported to the classifier in the primary grading and dehydration system for grading and concentration. The overflow C of the classifier has a mass concentration of 40% to 50% and the proportion of -0.35 mm ore is more than 90%. The sand D of the classifier has a mass concentration of 70% to 85% and the proportion of +0.35 mm ore is more than 90%. After the sand D of the classifier is concentrated by the concentration equipment, the mass concentration of the concentrated product E is 85% to 90%. The overflow with a mass concentration of 10% to 20% is returned to the classifier of the primary grading and dehydration system to participate in the grading cycle. (3) The overflow C of the classifier of the primary grading and dehydration system is transported to the classifier of the secondary grading and dehydration system for grading and concentration. The mass concentration of the overflow F of the classifier of the secondary grading and dehydration system is 20% to 30% and the proportion of -0.10 mm ore is more than 90%. The mass concentration of the classifier sediment G is 75% to 85% and the proportion of +0.10 mm ore is more than 90%. After the classifier sediment G is concentrated by the concentration equipment, the mass concentration of the concentrated product H is 85% to 90%. The overflow with a mass concentration of 10% to 20% is returned to the classifier of the secondary grading and dehydration system to participate in the grading cycle. (4) The overflow F from the secondary grading and dehydration system is transported to the tertiary grading and dehydration system for grading and concentration. The overflow I from the tertiary grading and dehydration system has a mass concentration of 5% to 10% and the proportion of -0.01 mm ore is more than 90%, and directly enters the tailings treatment system; the mass concentration of the sand J from the grading machine is 65% to 75%; (5) The concentrated products E and H in the primary and secondary grading and dehydration systems and the sand settling G in the tertiary grading and dehydration system enter the filter for dehydration. The moisture content of the dehydrated product K is below 10%. The dehydrated product K and the material A on the screen enter the ball mill bin for storage.
2. The method for classifying and concentrating an ore containing a large amount of fine-grained ore slime according to claim 1, characterized in that: In the step (1), the ore washing equipment is a drum ore washer or a wheel sand washer; the ore mud after washing is transported to the screening equipment, and the conveying equipment is a screw conveyor or a slurry pump; the screening equipment is a vibrating linear dewatering screen or a cylindrical screen.
3. The method for classifying and concentrating an ore containing a large amount of fine-grained ore mud according to claim 1, characterized in that: In the step (2), the transport method of the material B under the transport screen is belt transport or screw conveyor transport; the classifier of the primary grading and dehydration system uses a mud bucket or a high weir double screw classifier; the concentration equipment in the primary grading and dehydration system uses a vibrating dehydration screen, and the slurry pump is used to lift the material under the dehydration screen and return it to the classifier of the primary grading and dehydration system through a pipeline to participate in the grading cycle.
4. The method for classifying and concentrating an ore containing a large amount of fine-grained ore mud according to claim 1, characterized in that: In the step (3), the overflow C of the classifier of the primary grading and dehydrating system is transported by pipeline and transported to the spiral classifier or the grading box of the secondary grading and dehydrating system below; the concentration equipment in the secondary grading and dehydrating system uses a vibrating dehydrating screen, and the material under the screen is lifted by a slurry pump and returned to the classifier of the secondary grading and dehydrating system through a pipeline to participate in the grading cycle.
5. The method for classifying and concentrating an ore containing a large amount of fine-grained ore slime according to claim 1, characterized in that: In the step (4), the overflow F of the classifier of the secondary classification and dehydration system is transported by pipeline to the classifier of the tertiary classification and dehydration system below, and the classifier is a hydrocyclone; the ratio of the diameter of the hydrocyclone to the diameter of the overflow pipe is 3.66 to 2.75, and the feed pressure is 0.04 to 0.15 MPa.
6. The method for classifying and concentrating an ore containing a large amount of fine-grained ore slime according to claim 1, characterized in that: In the step (5), the primary, secondary and tertiary dehydration systems are arranged from high to low, and the dehydrated products E and H of the concentration equipment and the cyclone sedimentation G are transported to the filter by pipeline through the height difference for dehydration, or placed on the same plane and transported to the filter step by step by a slurry pump; the filter uses a ceramic vacuum filter or a plate and frame pressure filter, and the moisture content of the obtained filter cake product is less than 10%; the transportation equipment for transporting the dehydrated product K and the screened material A to the ball mill is a belt conveyor.