Process method for beneficiating fluorite in polymetallic ore

Abstract

The invention discloses a beneficiation process method for fluorite in polymetallic ore, which comprises the following steps: (1) performing photoelectric beneficiation on coarsely crushed raw ore after coarsely crushing, controlling the particle size to be 50mm after coarsely crushing in order to exert the performance of photoelectric beneficiation equipment, and adopting a section-by-section closed-loop crushing process in the design of coarsely crushing; and (2) fine crushing: performing fine crushing by adopting a cone crusher after light separation, performing inspection screening, feeding the raw ore with the particle size smaller than 12mm into an ore grinding bin, and returning the raw ore with the particle size larger than 12mm to the cone crusher for crushing. The overall ore dressing process flow designed by the invention comprises the following steps: coarse crushing of raw ore, fine crushing, two-stage ore grinding (stirring and size mixing), desulfurization, fluorite flotation (one-time roughing, two-time scavenging and seven-time concentration), dehydration and product (and tailings), the concentrate grade in the ore dressing process is 97.00%, and the ore dressing recovery rate is greater than 90%.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and in particular to a fluorite ore dressing process method in a polymetallic ore. Background Art

[0002] In order to improve the grade of minerals and remove some harmful impurities, chemical or physical methods are usually used to beneficiate minerals. Fluorite is an important non-metallic mineral resource, which is distributed all over the world. Its main component is calcium fluoride (CaF2). It is an important raw material for preparing fluorine-containing compounds and is widely used in metallurgy, aluminum smelting, glass, ceramics, cement, chemical industry and other industries. In addition to fluorite, fluorite deposits are generally associated or symbiotic with other minerals. The existing beneficiation process is simple and the beneficiation efficiency is poor. Based on this, the present invention further improves it. Summary of the invention

[0003] In view of the defects of the prior art, the purpose of the present invention is to provide a fluorite beneficiation process method in a polymetallic ore to solve the problems raised in the above background technology.

[0004] The present invention solves the technical problem by adopting the following technical solution:

[0005] The present invention provides a fluorite beneficiation process in a polymetallic ore, comprising the following steps:

[0006] (1) Coarse crushing

[0007] After coarse crushing, the raw ore enters the photoelectric ore dressing process. In order to give full play to the performance of the photoelectric ore dressing equipment, the particle size after coarse crushing is controlled at 50mm. The coarse crushing design adopts a one-stage closed-circuit crushing process.

[0008] (2) Finely crushed

[0009] After optical selection, the ore is crushed by cone crusher, and inspection and screening are set. The ore with particle size less than 12mm enters the grinding ore bin, and the ore with particle size greater than 12mm returns to the cone crusher for crushing;

[0010] (3) Secondary Grinding

[0011] The design adopts two-stage grinding of raw ore;

[0012] (4) Desulfurization

[0013] XGF / BS-K4 aerated flotation machine is used for desulfurization. After desulfurization, the pulp enters the flotation process, and the desulfurization wastewater enters the sewage station for treatment;

[0014] (5) Fluorite flotation

[0015] Fluorite flotation design adopts one roughing, seven cleaning and two scavenging process. The first cleaning tailings are returned to the grinding, and the remaining middlings are returned in sequence. The roughing and scavenging are equipped with XGF / BS-K4 aerated flotation machine, and the cleaning is equipped with XGF / BS-K4 aerated flotation machine. The concentrate grade is 97.00%, and the mineral processing recovery rate is greater than 90%;

[0016] (6) Dehydration

[0017] Fluorite concentrate is pumped to the thickener for thickening by slurry pumps, and the underflow of the thickener flows to the disc filter for dehydration. The dehydrated fluorite concentrate is stored in the concentrate warehouse for sale. The overflow of the thickener flows to the return water tank by gravity, and the filtrate of the filter is returned to the return water tank by the water pump.

[0018] Preferably, a jaw crusher is used for crushing in a closed-circuit crushing process, and a three-layer circular vibrating screen is used for pre-screening and inspection. The ore with a particle size less than 10 mm directly enters the grinding ore bin, the ore with a particle size of 10-50 mm enters the intermediate bin for optical selection, and the ore with a particle size greater than 50 mm is returned to the jaw crusher for crushing via a return belt.

[0019] Preferably, a ZTMG2400×3600 grid ball mill is used for the first stage of the two-stage grinding, and a FG-20+ high weir single spiral classifier is used for the classification.

[0020] Preferably, the second stage grinding uses a ZTMY2100×3000 overflow ball mill, and the classification uses There is one cyclone group, the first stage grinding fineness is -0.074mm accounting for 55%, and the second stage grinding fineness is -0.074mm accounting for 72.50%.

[0021] Preferably, the dewatered flotation tailings are fed into the thickening cyclone group by a slurry pump, the cyclone bottom flows into the dewatering screen, the material on the screen is transported to the tailings temporary storage yard by a belt conveyor, and the material under the screen flows by gravity to the slurry pump box.

[0022] Preferably, the overflow of the cyclone flows by gravity to the separation box and then to the deep cone thickener. The underflow of the deep cone thickener is collected and fed into the chamber automatic filter press by the filter press feed pump for filtration. The filter cake is transported to the tailings temporary storage yard by a belt conveyor. The overflow of the deep cone thickener and the filtrate of the filter press flows by gravity to the recycle pool for recycling.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The overall mineral processing process designed by the present invention is: coarse crushing of raw ore → fine crushing → two-stage grinding (stirring and slurry adjustment) → desulfurization → fluorite flotation (1 roughing, 2 scavenging, 7 concentrating) → dehydration → product (and tailings). The concentrate grade in the mineral processing process is 97.00%, and the mineral processing recovery rate is greater than 90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] A fluorite beneficiation process in a polymetallic ore of this embodiment comprises the following steps:

[0028] (1) Coarse crushing

[0029] After coarse crushing, the raw ore enters the photoelectric ore dressing process. In order to give full play to the performance of the photoelectric ore dressing equipment, the particle size after coarse crushing is controlled at 50mm. The coarse crushing design adopts a one-stage closed-circuit crushing process.

[0030] (2) Finely crushed

[0031] After optical selection, the ore is crushed by cone crusher, and inspection and screening are set. The ore with particle size less than 12mm enters the grinding ore bin, and the ore with particle size greater than 12mm returns to the cone crusher for crushing;

[0032] (3) Secondary Grinding

[0033] The design adopts two-stage grinding of raw ore;

[0034] (4) Desulfurization

[0035] XGF / BS-K4 aerated flotation machine is used for desulfurization. After desulfurization, the pulp enters the flotation process, and the desulfurization wastewater enters the sewage station for treatment;

[0036] (5) Fluorite flotation

[0037] Fluorite flotation design adopts one roughing, seven cleaning and two scavenging process. The first cleaning tailings are returned to the grinding, and the remaining middlings are returned in sequence. The roughing and scavenging are equipped with XGF / BS-K4 aerated flotation machine, and the cleaning is equipped with XGF / BS-K4 aerated flotation machine. The concentrate grade is 97.00%, and the mineral processing recovery rate is greater than 90%;

[0038] (6) Dehydration

[0039] Fluorite concentrate is pumped to the thickener for thickening by slurry pumps, and the underflow of the thickener flows to the disc filter for dehydration. The dehydrated fluorite concentrate is stored in the concentrate warehouse for sale. The overflow of the thickener flows to the return water tank by gravity, and the filtrate of the filter is returned to the return water tank by the water pump.

[0040] In the one-stage closed-circuit crushing process of this embodiment, a jaw crusher is used for crushing, and a three-layer circular vibrating screen is used for pre-screening and inspection. The ore with a particle size less than 10 mm directly enters the grinding ore bin, the ore with a particle size of 10-50 mm enters the intermediate bin for optical selection, and the ore with a particle size greater than 50 mm is returned to the jaw crusher for crushing via a return belt.

[0041] In the two-stage grinding of this embodiment, a ZTMG2400×3600 grid ball mill is used for the first stage grinding, and a FG-20+ high weir single spiral classifier is used for the classification.

[0042] In this embodiment, the second stage grinding uses a ZTMY2100×3000 overflow ball mill, and the classification uses There is one cyclone group, the first stage grinding fineness is -0.074mm accounting for 55%, and the second stage grinding fineness is -0.074mm accounting for 72.50%.

[0043] In this embodiment, the dewatered flotation tailings are fed into the thickening cyclone group by a slurry pump, and the cyclone bottom flows into the dewatering screen. The material on the screen is transported to the tailings temporary storage yard by a belt conveyor, and the material under the screen flows to the slurry pump box by gravity.

[0044] The overflow of the cyclone in this embodiment flows by gravity to the separation box and then to the deep cone thickener. The underflow of the deep cone thickener is collected and fed into the chamber automatic filter press by the filter press feed pump for filtration. The filter cake is transported to the tailings temporary storage yard by the belt conveyor. The overflow of the deep cone thickener and the filtrate of the filter press flow by gravity to the return water tank for recycling.

[0045] According to the design scale of mineral processing, ore properties and process flow characteristics, the main equipment selection follows the following principles: (1) Large-scale equipment specifications are easy to operate and manage, and improve production efficiency. (2) Domestic equipment is used as much as possible. When domestic equipment cannot meet the requirements, foreign equipment can be introduced. (3) The selection of main equipment takes into account different fluctuation coefficients and safety factors. (4) The selected equipment is easy to purchase, and the supply channels of spare parts are unobstructed to ensure the integrity of the equipment and the operation rate of the entire site. Crushing and screening equipment The selection of crushing and screening equipment comprehensively considers many factors such as mine scale, ore properties, subsequent mineral processing technology and equipment, etc. The selection calculation of the main crushing and screening equipment is shown in the table below. Crushing equipment table

[0046]

[0047] Screening equipment table

[0048]

[0049] Grinding equipment

[0050] The two-stage closed-circuit grinding process is adopted. The process requires that the final grinding product is -0.074mm accounting for 90%. The use of one-stage grinding is prone to over-grinding. The two-stage grinding can not only ensure the fineness of the final grinding product, but also effectively reduce the occurrence of over-grinding. The first-stage grinding and the spiral classifier form a closed circuit, and the overflow particle size is -0.074mm accounting for 60%. The first-stage grinding product is desludging and flotation, and the flotation concentrate enters the second-stage grinding. The second-stage grinding and the cyclone form a closed-circuit grinding, and the overflow fineness is -0.074mm accounting for 90%. Recommended selection of grinding equipment. Grinding equipment table

[0051]

[0052] Grading equipment

[0053] A high weir spiral classifier is selected in the first stage of grinding to form a closed circuit. The design parameters are as follows: the amount of solid ore in the overflow = 20.83t / h, and the overflow particle size is -0.074mm, accounting for 60%.

[0054] Since the second-stage grinding has a finer particle size, a hydrocyclone is used to form a closed circuit with it. The recommended selection of grading equipment is shown in the table.

[0055] Classification Equipment Table

[0056]

[0057]

[0058] The flotation equipment adopts secondary desulfurization flotation process for desulfurization. After desulfurization, it is added with chemicals and stirred in a TBJ-2000 lifting and stirring tank and a Ф2000×2000 fluorite-specific slurry stirring tank before entering the fluorite flotation operation.

[0059] Fluorite flotation adopts a process of one roughing, two scavenging and seven concentrating. The tailings of the first concentrating are returned to the grinding, and the rest of the middlings are returned in sequence. 16 XGF / BS-K4 aerated flotation machines are used for desulfurization roughing and scavenging, and 22 XGF / BS-K4 aerated flotation machines are used for concentrating. The flotation concentrate is pumped to the fluorite concentrate dehydration operation by a slurry pump, and the tailings are transported to the tailings treatment workshop by a slurry pump.

[0060] Flotation Equipment Table

[0061]

[0062] Dehydration equipment

[0063] (1) Concentrate dehydration

[0064] Fluorite concentrate is pumped by slurry pump to a NXZ-15 thickener for thickening. The underflow of the thickener flows by gravity to a 30m2 disc filter for dehydration. The dehydrated fluorite concentrate is stored in the concentrate warehouse for sale. The overflow of the thickener flows by gravity to the return water tank, and the filtrate of the filter is returned to the return water tank by the water pump.

[0065] (2) Tailings dewatering

[0066] The flotation tailings are fed into a 250×4 thickening cyclone group by a slurry pump. The bottom flow of the cyclone enters a ZKGT1236 dewatering screen. The material on the screen is transported to the tailings yard for storage by a belt conveyor, and the material under the screen flows to the slurry pump box by gravity. The overflow of the cyclone flows by gravity to the separation box and is divided into three 15m deep cone thickeners. The bottom flow of the deep cone thickener is collected and fed into two 250m2 chamber automatic filter presses by the filter press feed pump for filtration. The filter cake is transported to the tailings yard for storage by a belt conveyor. The overflow of the deep cone thickener and the filtrate of the filter press flow by gravity to the return water tank for recycling.

[0067] Fluorite concentrate dehydration equipment table

[0068]

[0069] Tailings dewatering equipment calculation table

[0070]

[0071]

[0072] The present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is limited by the appended claims rather than the above description, so it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0073] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A fluorite beneficiation process in polymetallic ores, It is characterized in that The following steps are involved: (1) Coarse crushing After coarse crushing, the raw ore enters the photoelectric ore dressing process. In order to give full play to the performance of the photoelectric ore dressing equipment, the particle size after coarse crushing is controlled at 50mm. The coarse crushing design adopts a one-stage closed-circuit crushing process. (2) Finely crushed After optical separation, the ore is crushed by cone crusher, and inspection and screening are set. The ore with particle size less than 12mm enters the grinding ore bin, and the ore with particle size greater than 12mm returns to the cone crusher for crushing; (3) Secondary Grinding The design adopts two-stage grinding of raw ore; (4) Desulfurization XGF / BS-K4 aerated flotation machine is used for desulfurization. After desulfurization, the pulp enters the flotation process, and the desulfurization wastewater enters the sewage station for treatment; (5) Fluorite flotation Fluorite flotation design adopts one roughing, seven cleaning and two scavenging process. The first cleaning tailings are returned to the grinding, and the remaining middlings are returned in sequence. The roughing and scavenging are equipped with XGF / BS-K4 aerated flotation machine, and the cleaning is equipped with XGF / BS-K4 aerated flotation machine. The concentrate grade is 97.00%, and the mineral processing recovery rate is greater than 90%; (6) Dehydration Fluorite concentrate is pumped to the thickener for thickening by slurry pumps, and the underflow of the thickener flows to the disc filter for dehydration. The dehydrated fluorite concentrate is stored in the concentrate warehouse for sale. The overflow of the thickener flows to the return water tank by gravity, and the filtrate of the filter is returned to the return water tank by the water pump.

2. A fluorite beneficiation process in a polymetallic ore according to claim 1, It is characterized in that In the one-stage closed-circuit crushing process, jaw crusher is used for crushing, and three-layer circular vibrating screen is used for pre-screening and inspection. The ore with a particle size less than 10mm goes directly into the grinding ore bin, the ore with a particle size of 10-50mm goes into the intermediate bin for optical selection, and the ore with a particle size greater than 50mm is returned to the jaw crusher for crushing via the return belt.

3. A fluorite beneficiation process in a polymetallic ore according to claim 2, It is characterized in that A ZTMG2400×3600 grid ball mill is used for the first stage of the two-stage grinding, and a FG-20+ high weir single spiral classifier is used for the classification.

4. A fluorite beneficiation process in a polymetallic ore according to claim 3, It is characterized in that The second stage grinding uses a ZTMY2100×3000 overflow ball mill, and the classification uses a φ250×4 cyclone group. The first stage grinding fineness is -0.074mm, accounting for 55%, and the second stage grinding fineness is -0.074mm, accounting for 72.50%.

5. The fluorite beneficiation process in polymetallic ores according to claim 1, It is characterized in that The flotation tailings in dewatering are fed into the thickening cyclone group by the slurry pump, and the bottom flow of the cyclone enters the dewatering screen. The material on the screen is transported to the tailings temporary storage yard by the belt conveyor, and the material under the screen flows to the slurry pump box by gravity.

6. A fluorite beneficiation process in a polymetallic ore according to claim 5, It is characterized in that The overflow of the cyclone flows by gravity to the separation box and then to the deep cone thickener. The bottom flow of the deep cone thickener is collected and fed into the chamber automatic filter press by the filter press feed pump for filtration. The filter cake is transported to the tailings temporary storage yard by the belt conveyor. The overflow of the deep cone thickener and the filtrate of the filter press flows by gravity to the recycle pool for recycling.

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