Phosphorite photoelectric physical beneficiation and tailing reverse beneficiation system and method

Abstract

The invention discloses a system and method for phosphorite photoelectric physical beneficiation and tailing reverse separation. The system comprises a raw ore temporary storage subsystem, a crushing and screening subsystem, a photoelectric beneficiation subsystem and a tailing reverse separation subsystem which are connected in sequence. The raw ore temporary storage subsystem comprises an ore receiving bin for storing raw ore; the crushing sieve molecular system comprises a jaw crusher, a raw ore grading sieve and a cone crusher, and the jaw crusher, the raw ore grading sieve and the cone crusher are matched through a plurality of belt conveyors to form a two-section one-closed-circuit crushing system; the photoelectric ore dressing subsystem comprises a powder removing sieve and a raw ore photoelectric sorting machine which are connected in sequence; the tailing reverse separation subsystem comprises a tailing photoelectric sorting machine, tailing resources are recycled through the photoelectric physical beneficiation technology, automatic operation of the beneficiation production link can be achieved, a large amount of waste water and waste cannot be generated in the beneficiation process, and the beneficial effects of being green, efficient and environmentally friendly are achieved. And the beneficiation recovery rate and the comprehensive utilization level of phosphorite resources are improved.

Description

Technical Field

[0001] The invention relates to the technical field of comprehensive utilization of phosphate tailings, in particular to a system and method for photoelectric physical beneficiation of phosphate ore and reverse selection of tailings. Background Art

[0002] At present, the comprehensive utilization of tailings resources at home and abroad can be summarized into the following ways: (1) Comprehensively recycle the useful components of tailings resources, use advanced technology and reasonable processes to re-select tailings, and maximize the recovery of useful components in tailings, which can further reduce the amount of tailings. Some beneficiation plants are gradually developing towards the direction of no tailings. (2) Tailings are used as filling materials in underground mining goafs, that is, water-sand filling materials or aggregates for cementing filling. The most ideal filling process for tailings as filling materials in goafs is the full tailings filling process, but it is still in the experimental research stage. In production, the coarse particles in the tailings are used as filling materials in goafs. After the tailings are discharged from the beneficiation plant, they are sent to the tailings preparation section for classification. The coarse sand part is sent to the underground goaf, and the fine particles are stored in the tailings pond. This tailings treatment method has been applied both at home and abroad. (3) Use tailings as raw materials for building materials: making cement, silicate tailings bricks, tiles, aerated concrete, cast stone, refractory materials, glass, ceramsite, concrete aggregate, microcrystalline glass, slag tiles, foam glass and foam materials, etc. (4) Use tailings to build roads, pavement materials, anti-skid materials, coastal land reclamation, etc. (5) Cover the tailings dump with soil to build farmland, plant crops or plant trees. (6) Store tailings in specially built tailings ponds, which is the most widely used tailings treatment method in most mineral processing plants.

[0003] Predecessors have conducted a lot of research on the treatment of phosphate tailings, mainly including phosphate tailings flotation or double reverse flotation, biological phosphorus leaching and hydrochloric acid precipitation, etc., combined with heavy medium beneficiation technology, the phosphorus, silicon and other metal resources in the phosphate tailings can be recovered, forming a relatively complete production process. However, traditional beneficiation methods require a lot of cost and time to control the environment. Therefore, it is particularly important to combine the emerging photoelectric physical beneficiation technology with the comprehensive utilization of tailings to form a safe and environmentally friendly intelligent beneficiation system.

[0004] CN202310803562.9 The present application discloses a phosphate ore photoelectric beneficiation and sorting system, including a crushing component, a screening component, and a sorting component connected in sequence; the crushing component includes a crusher for crushing the raw ore; the screening component includes a vibrating screen for screening the crushed raw ore; the sorting component includes a conveyor belt for conveying the ore screened by the vibrating screen, and a ray source and a detector respectively located on both sides of the conveyor belt, and a gas discharge gun located at the end of the conveyor belt. The phosphate ore photoelectric beneficiation and sorting process described in the invention can realize the throwing of about 10.35% of low-grade phosphate ore in the particle size range of 10 to 40 mm through photoelectric intelligent beneficiation before entering the flotation operation, reducing the cost of subsequent flotation operations, which is equivalent to the preliminary preparation work of the phosphate ore flotation operation, and is part of the entire beneficiation process, and does not introduce the treatment of phosphate tailings.

[0005] CN202010917666.9 provides a phosphate ore photoelectric beneficiation and sorting process, including phosphate ore screening; detector data collection, identification and differentiation of ore and waste rock through intelligent algorithm; precise striking by high-speed air discharge gun to separate concentrate from tailings, etc. This invention is currently only applicable to the sorting of high-magnesium phosphate ore in the middle phosphorus layer, and the comprehensive utilization of phosphate tailings is not mentioned in this sorting process.

[0006] CN202111349804.9 provides a collophane ore dressing process combining photoelectric beneficiation with heavy medium beneficiation. The raw ore is crushed and screened, and high-pressure water washing is performed during the screening process. The washed ore enters the photoelectric separator for beneficiation, and the selected optical concentrate is collected, and the optical tailings are reserved; the previously obtained optical tailings are crushed and screened, and the screened material enters the washing screen for further washing, and the screened material after washing enters the heavy medium cyclone for beneficiation, and the washed screened material enters the water treatment link; the products selected by the heavy medium cyclone enter the de-medium screen to remove the medium to obtain the heavy-separation concentrate, heavy-separation ore sand and heavy-separation tailings. The invention combines photoelectric beneficiation with heavy medium beneficiation, and can reuse the tailings of photoelectric beneficiation, which produces certain economic benefits. However, a large amount of wastewater and waste residue is easily generated during the treatment of heavy medium tailings. If the screening and removal are not thorough, it can not only fail to ensure the stability of ore quality, but also face the environmental pressure of wastewater treatment.

[0007] CN202010004508.4 discloses a process for treating collophanite flotation tailings, wherein the collophanite flotation tailings are pre-floated to remove tailings, and the pre-flotation concentrate products are concentrated. The high-concentration pulp obtained by concentration enters the classification operation, and the low-concentration product returns to the collophanite flotation system; the coarse-grained product obtained by classification is re-ground, and the re-ground product returns to the classification operation; the overflow product obtained by classification enters the reverse flotation re-selection operation; the re-selected tailings return to the pre-flotation operation, and the re-selected concentrate is used as the final concentrate. The process treatment of the invention is currently applicable to the common reverse flotation tailings of collophanite, and can obtain concentrates with a P2O5 grade of ≥28% and a MgO grade of ≤1.2%; the invention can obtain stable technical and economic indicators for the reprocessing of collophanite flotation tailings, obtain phosphate concentrates under low production cost conditions, improve the utilization rate of phosphate resources, and reduce the tailings discharge of the entire flotation plant.

[0008] CN201510314468.2 discloses a method for treating phosphate tailings by a single positive flotation process, wherein the phosphate tailings are directly fed into a roughing flotation machine for a roughing operation, and an appropriate amount of pH adjuster, inhibitor, and anion collector are added during the roughing operation; the foam product of the roughing operation is graded according to a particle size of 325 mesh; the +325 mesh product is fed to the grinding operation and ground to the grinding fineness required by the flotation operation; the product ground by the grinding operation and the -325 mesh product are combined and fed to the secondary roughing operation; the foam product of the secondary roughing operation is subjected to 3 to 4 rounds of selection, and the product in the tank is subjected to 1 to 2 rounds of scavenging to obtain a concentrate product. The final phosphate concentrate obtained by the invention has a high grade and recovery rate, a simple process, and is easy to realize industrialization. It not only greatly alleviates the pollution caused by phosphate tailings to the environment.

[0009] CN202311667770.7 provides a phosphate ore flotation process, the steps of which are as follows: the incoming material is taken from the bottom flow of the concentrate inclined plate, is fed into the stirring tank of the reverse flotation column after classification by a cyclone, is fed into the flotation column for reverse flotation desulfurization after pretreatment, the desulfurized tailings are fed into the stirring barrel of the roughing flotation column, and is fed into the flotation column via a peristaltic pump for rough and fine flotation. Through the reverse flotation desulfurization process, the flotation column overflow Cu grade is 5.36%, the bottom flow yield is 98.41%, and the recovery rate is 49.20%. The bottom flow after desulfurization is used for rough selection of phosphorus, and the yield of the rough concentrate stage is 12.38%, the P2O5 grade is 20.50%, and the P2O5 recovery rate is 90.61%. The rough concentrate can be further selected to obtain a phosphate concentrate with a P2O5 grade greater than 25%. At a P2O5 grade of 27%, the yield is 66.32%, and the recovery rate is 87.35%, thereby achieving an increase in the recovery rate and overcoming the problem of difficult selection of ultra-fine phosphate ore.

[0010] CN202210264488.3 discloses a method for comprehensive treatment of phosphorus tailings by reverse flotation and the application of recovered silicon slag. The invention improves the added value of phosphorus tailings acid through a simple process, realizes the resource treatment of waste, and the prepared silicon slag can meet the application of roadbed materials.

[0011] CN201810893283.5 discloses a double reverse flotation process for calci-silico colloid phosphate ore for recovering tailings resources through acid leaching. The invented process is simple and stable. Mixed acid is produced by phosphate tailings and returned to the reverse flotation and magnesium removal operation of phosphate ore, which greatly reduces the emission of phosphate tailings and the consumption of concentrated sulfuric acid. It has great application prospects in energy conservation and emission reduction.

[0012] CN201310611657.7 discloses a method for comprehensive utilization of reverse flotation phosphate tailings, belonging to the field of comprehensive utilization of tailings. The reverse flotation phosphate tailings are calcined at 800-1200°C, and then the calcined product is crushed, and finally the crushed calcined product is classified according to particle size to obtain calcium-magnesium-rich products, phosphorus-rich products and silicon-rich products. The generated phosphorus-rich products are raw materials for phosphorus chemical industry, and the calcium-magnesium-rich products and silicon-rich products are raw materials for building materials. The method of the invention has a simple process, basically no discharge of wastewater and waste solids, and is suitable for industrial application; it achieves the purpose of efficient utilization of reverse flotation phosphate tailings.

[0013] The existing beneficiation method of a certain phosphate mine is efficient and environmentally friendly photoelectric physical beneficiation. The way to deal with tailings is to transport the tailings to the underground goaf for filling, with medium and fine tailings as the filling material. Some of the tailings also contain a small amount of phosphate rock resources, resulting in a waste of phosphorus resources. At present, similar mines in the surrounding areas have also conducted little research on the utilization of tailings resources. Summary of the invention

[0014] The present invention provides a system and method for photoelectric physical beneficiation of phosphate ore and reverse separation of tailings, aiming to solve the problems of waste of phosphorus resources, pollution generated in the beneficiation process and complex process in the existing tailings treatment.

[0015] In order to solve the above technical problems, the technical solution adopted by the present invention is: A system for photoelectric physical ore dressing and tailings reverse selection of phosphate ore, comprising a raw ore temporary storage subsystem, a crushing and screening subsystem, a photoelectric ore dressing subsystem and a tailings reverse selection subsystem connected in sequence; The raw ore temporary storage subsystem includes an ore receiving bin storing raw ore; The crushing and screening molecular system includes a jaw crusher, an ore grading screen and a cone crusher, and the jaw crusher, the ore grading screen and the cone crusher are coordinated through a plurality of belt conveyors to form a two-stage one-closed-circuit crushing system; The photoelectric ore dressing subsystem comprises a powder removal screen and a raw ore photoelectric separator connected in sequence; The tailings counter-selection subsystem includes a tailings photoelectric separator.

[0016] Preferably, the discharge end of the receiving ore bin is connected to the feed end of the jaw crusher through a feeder, the discharge end of the jaw crusher is connected to the feed end of the raw ore grading screen through a first belt conveyor, the large-particle size discharge end of the raw ore grading screen is connected to the feed of the cone crusher through a second belt conveyor, the discharge end of the cone crusher returns the material to the feed end of the raw ore grading screen through a third belt conveyor, and the product discharge end of the raw ore grading screen is connected to the feed end of the intermediate storage bin through a fourth belt conveyor.

[0017] As a more preferred embodiment, the discharge end of the intermediate storage bin is connected to the feed end of the de-powdering screen through a feeder, the large-particle size discharge end of the de-powdering screen is connected to the feed end of the raw ore photoelectric sorting machine through the fifth belt conveyor, and the tailings discharge end of the raw ore photoelectric sorting machine is connected to the feed end of the tailings photoelectric sorting machine through the sixth belt conveyor.

[0018] Furthermore, the raw ore photoelectric separator and the tailings photoelectric separator are both TDS intelligent dry separators that utilize X-ray identification.

[0019] A method for photoelectric physical beneficiation of phosphate ore and reverse separation of tailings, using the above-mentioned system for photoelectric physical beneficiation of phosphate ore and reverse separation of tailings to perform photoelectric physical beneficiation and reverse separation of tailings on phosphate ore, comprising the following steps: S1. Ore preparation: The underground ore is transported by car to the ore storage yard for stacking. After the small drilling excavator initially breaks the large pieces of ore, the shovel loader pushes it into the ore receiving bin of the ore temporary storage subsystem; S2. Crushing and screening: The raw ore is fed into the jaw crusher of the crushing and screening molecular system through the ore feeder under the ore receiving bin for primary crushing. After the primary crushing, the raw ore enters the raw ore grading screen for classification. The screened material is fed into the cone crusher for secondary crushing through the belt conveyor. After the secondary crushing, the raw ore is transferred to the raw ore grading screen for screening through the belt conveyor, realizing a two-stage one closed-circuit crushing system. S3, photoelectric beneficiation of raw ore: The raw ore formed by the screening system is transported to the intermediate warehouse by the belt conveyor for storage, and is fed to the powder removal screen of the photoelectric beneficiation subsystem through the under-warehouse feeder to remove the powder ore and store it. The remaining ore is intelligently sorted by the raw ore photoelectric separator to obtain concentrate and tailings; S4. Photoelectric reverse separation of tailings: The primary tailings are transported by belt conveyors to the tailings reverse separation subsystem, and are identified and sorted by tailings photoelectric sorting machines to obtain phosphate ore and final tailings. The phosphate ore is transported to the ore dump for storage, and the tailings are transferred to the tailings dump for storage.

[0020] Preferably, the primary crushing in S2 requires the particle size to be crushed to less than 100 mm, the raw ore grading screen is graded according to the particle size of 40 mm, the sieve material exceeding 40 mm enters the secondary crushing, and the material below 40 mm enters S3; The powder removal screen in S3 is classified according to 10mm, and removes powder ore below 10mm.

[0021] Preferably, the original ore photoelectric separator in S3 and the tailings photoelectric separator in S4 are of the same model, and corresponding sorting coefficient K values ​​are set according to different phosphate ores, and the relative phosphate ore grade is positively correlated with the sorting coefficient K value.

[0022] As a more preferred embodiment, the sorting coefficient K value of the tailings photoelectric separator in S4 is not less than the sorting coefficient K value of the original ore photoelectric separator in S3.

[0023] Furthermore, the photoelectric separator for raw ore in S3 and the photoelectric separator for tailings in S4 are both provided with three sets of separation coefficient K values, which are 50, 55 and 60 respectively, and are applicable to the comprehensive grade of raw ore of 18%-22%.

[0024] Furthermore, the photoelectric separator for raw ore in S3 and the photoelectric separator for tailings in S4 both use high-speed variable-frequency motors to drive a PU conveyor belt with a bandwidth of 1.6 m. The rotation speed is stably controlled at 1985 r / min, and the conveyor belt speed is stably controlled at 2.8 m / s.

[0025] Beneficial effects of the present invention: The present invention mainly takes photoelectric physical mineral processing technology as the theoretical basis, selects reasonable parameters for modeling, performs intelligent identification and secondary sorting of phosphorus ore in the primary tailings, and recovers part of the phosphorus ore resources in the primary tailings; The present invention adopts photoelectric physical mineral processing technology to recycle tailings resources, can realize automated operation and remote control in mineral processing production links, reduces safety risks and occupational health risks, does not generate a large amount of wastewater and waste during the mineral processing process, and has the characteristics of being green, efficient and environmentally friendly; and improves the mineral processing recovery rate and the comprehensive utilization level of phosphate resources, has very high economic and social benefits, and can be promoted and used in similar mines in surrounding areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the process of the present invention; Figure 2 It is a schematic diagram of the principle of the intelligent dry separator in the present invention. DETAILED DESCRIPTION

[0027] As follows, embodiments are further described with reference to the accompanying drawings.

[0028] like Figure 1As shown, as a preferred embodiment 1, a system for photoelectric physical beneficiation of phosphate ore and reverse selection of tailings includes a raw ore temporary storage subsystem, a crushing and screening subsystem, a photoelectric beneficiation subsystem and a tailings reverse selection subsystem connected in sequence; The raw ore temporary storage subsystem includes an ore receiving bin storing raw ore; The crushing and screening molecular system includes a jaw crusher, an ore grading screen and a cone crusher, and the jaw crusher, the ore grading screen and the cone crusher are coordinated through a plurality of belt conveyors to form a two-stage one-closed-circuit crushing system; The photoelectric ore dressing subsystem comprises a powder removal screen and a raw ore photoelectric separator connected in sequence; The tailings counter-selection subsystem includes a tailings photoelectric separator.

[0029] Preferably, the discharge end of the receiving ore bin is connected to the feed end of the jaw crusher through a feeder, the discharge end of the jaw crusher is connected to the feed end of the raw ore grading screen through a first belt conveyor, the large-particle size discharge end of the raw ore grading screen is connected to the feed of the cone crusher through a second belt conveyor, the discharge end of the cone crusher returns the material to the feed end of the raw ore grading screen through a third belt conveyor, and the product discharge end of the raw ore grading screen is connected to the feed end of the intermediate storage bin through a fourth belt conveyor.

[0030] As a more preferred embodiment, the discharge end of the intermediate storage bin is connected to the feed end of the de-powdering screen through a feeder, the large-particle size discharge end of the de-powdering screen is connected to the feed end of the raw ore photoelectric sorting machine through the fifth belt conveyor, and the tailings discharge end of the raw ore photoelectric sorting machine is connected to the feed end of the tailings photoelectric sorting machine through the sixth belt conveyor.

[0031] like Figure 2 As shown, as a preferred embodiment 2, the photoelectric sorting machine for raw ore and the photoelectric sorting machine for tailings can both use the existing TDS intelligent dry sorting machine using X-ray identification. The technical principle is to build a model based on the selected phosphate ore, and sort it by the differences in physical properties such as ray penetration ability, grayscale, texture, density and light diffusion. After the photoelectric sorting machine collects data and the computing system analyzes and identifies the data, a high-speed air discharge gun is used to accurately strike and separate the ore from the waste rock. The main components are divided into four modules: vibration distribution system, X-ray transmission detection system (high-definition image recognition system), computer software algorithm system, and pneumatic mine waste separation system.

[0032] (1) Material distribution system: It consists of a feeder, a chute, and a belt conveyor. It uses a two-stage buffer feeding system. The minerals are laid out in a single layer under the action of the feeding system and then pass through the inspection system, which ensures the sorting effect while maximizing the processing volume.

[0033] (2) Detection system: The X-ray transmission detection system consists of a ray generator and a ray receiver. The ore identification accuracy range can reach 40-10mm, and the 360-degree overall area can search the interior of the ore without blind spots. The high-definition image recognition system consists of a high-brightness light source and a high-definition digital camera, which can perform high-definition imaging of the ore based on the surface characteristics of the ore.

[0034] (3) Algorithm system: By studying the different characteristic information of the ore, such as color, texture, gloss, size, thickness, density, atomic sequence, etc., a targeted ore sorting training model is constructed to achieve high-speed and accurate recognition of massive ore data.

[0035] (4) Separation system: The hardware control part of the equipment is composed of important components such as industrial computers, high-speed controllers, relays, etc. Through algorithm optimization, it can automatically separate the mining waste by jetting in real time.

[0036] As a preferred embodiment 3, a method for photoelectric physical beneficiation of phosphate ore and reverse separation of tailings, using the above-mentioned system for photoelectric physical beneficiation of phosphate ore and reverse separation of tailings to perform photoelectric physical beneficiation and reverse separation of tailings on phosphate ore, comprises the following steps: S1. Ore preparation: The underground ore is transported to the ore storage yard by car and piled up. After the small drilling excavator initially breaks the large pieces of ore, the shovel loader pushes it into the ore receiving bin of the ore temporary storage subsystem; S2. Crushing and screening: The raw ore is fed into the jaw crusher of the crushing and screening molecular system through the ore feeder under the ore receiving bin for primary crushing. After the primary crushing, the raw ore enters the raw ore grading screen for classification. The screened material is fed into the cone crusher for secondary crushing through the belt conveyor. After the secondary crushing, the raw ore is transferred to the raw ore grading screen for screening through the belt conveyor, realizing a two-stage one closed-circuit crushing system. S3, photoelectric beneficiation of raw ore: The raw ore formed by the screening system is transported to the intermediate warehouse by the belt conveyor for storage, and is fed to the powder removal screen of the photoelectric beneficiation subsystem through the under-warehouse feeder to remove the powder ore and store it. The remaining ore is intelligently sorted by the raw ore photoelectric separator to obtain concentrate and tailings; S4. Photoelectric reverse separation of tailings: The primary tailings are transported by belt conveyors to the tailings reverse separation subsystem, and are identified and sorted by tailings photoelectric sorting machines to obtain phosphate ore and final tailings. The phosphate ore is transported to the ore dump for storage, and the tailings are transferred to the tailings dump for storage.

[0037] As a preferred embodiment 4, a method for photoelectric physical beneficiation of phosphate ore and reverse separation of tailings, using the above-mentioned system for photoelectric physical beneficiation of phosphate ore and reverse separation of tailings to perform photoelectric physical beneficiation and reverse separation of tailings on phosphate ore, comprises the following steps: S1. Ore preparation: The underground ore is transported by car to the ore storage yard for stacking. After the large pieces of ore are initially broken by a small drilling excavator, they are pushed into the receiving bin by a shovel loader.

[0038] S2. Crushing and screening: The raw ore is fed into the jaw crusher through the feeder under the ore receiving bin for primary crushing, and is crushed to less than 100mm. After the primary crushing, the raw ore enters the raw ore grading screen and is graded according to 40mm. The +40mm screened material is fed into the cone crusher through a belt conveyor and crushed to less than 40mm. After crushing, the raw ore is transferred to the raw ore grading screen through a belt conveyor for screening, realizing a two-stage and one-closed-circuit crushing system. The raw ore is screened before the secondary crushing, which can effectively reduce the processing capacity of the cone crusher. At the same time, materials less than 40mm are no longer crushed by the cone crusher for secondary crushing, reducing the over-crushing of the raw ore, and directly screening out medium and high-grade phosphate ore.

[0039] S3. Photoelectric beneficiation of raw ore: The 40-10mm raw ore formed by the screening system is transported to the intermediate warehouse by the belt conveyor for storage, and is fed into the powder removal screen through the under-warehouse feeder to remove the powder ore below 10mm and store it. The remaining ore is intelligently sorted by the TDS photoelectric separator to obtain concentrate and tailings.

[0040] S4. Photoelectric reverse separation of tailings: The primary tailings are transported by belt conveyors to the tailings reverse separation system, and are identified and sorted by TDS photoelectric sorting machines to obtain phosphate ore and tailings. The phosphate ore is transported to the ore dump for storage, and the tailings are transported to the tailings dump for storage.

[0041] As a preferred embodiment 5, the original ore photoelectric separator in S3 and the tailings photoelectric separator in S4 are of the same model, and corresponding sorting coefficient K values ​​are set according to different phosphate ores, and the relative phosphate ore grade is positively correlated with the sorting coefficient K value.

[0042] The sorting coefficient K value of the tailings photoelectric separator in S4 is not less than the sorting coefficient K value of the original ore photoelectric separator in S3.

[0043] The photoelectric separator for raw ore in S3 and the photoelectric separator for tailings in S4 are both equipped with three sets of sorting coefficient K values, which are 50, 55 and 60 respectively, and are applicable to the comprehensive grade of raw ore of 18%-22%.

[0044] According to the technical principle of the TDS intelligent dry sorter described in Example 2, the photoelectric physical beneficiation system can transmit phosphate ore through X-rays to study the different characteristic information of the ore, such as color, texture, gloss, size, thickness, density, atomic sequence, etc., and analyze the sorting coefficient K value of different phosphate ores through system calculation (the ore with higher relative phosphate grade has a large K value, and vice versa). There are multiple sets of intelligent identification parameters for phosphate ores of different grades and large differences. Three sets of beneficiation parameters are established for the first selection and tailings reverse selection. The K value of the phosphate ore sorting coefficient of parameter 1 is 50; the K value of the phosphate ore sorting coefficient of parameter 2 is 55; the K value of the phosphate ore sorting coefficient of parameter 3 is 60; the corresponding K value parameters are selected according to the different grades of raw ore to realize intelligent sorting, and the first selection process intelligent identification system identifies the phosphate tailings. The intelligent identification system of the tailings reverse selection process identifies the phosphate ore. After the identification is completed, the information computing center analyzes the data and transmits the instructions for the first selection and tailings reverse selection, and finally uses a high-speed air gun to separate the phosphate ore and the phosphate tailings.

[0045] As a preferred embodiment 6, the photoelectric separator for raw ore in S3 and the photoelectric separator for tailings in S4 both use high-speed variable-frequency motors to drive a PU conveyor belt with a bandwidth of 1.6m. The rotation speed is stably controlled at 1985r / min, and the conveyor belt speed is stably controlled at 2.8m / s. The conveyor belt speed is strictly controlled at 2.8m / s, which can ensure that the raw ore passes through the X-ray identification mechanism of the dry separator smoothly and evenly, making it convenient for the computer to make accurate and precise data analysis.

[0046] As a preferred embodiment 7, refer to Figure 1 According to the method for photoelectric physical ore dressing and tailings counter-selection of phosphate rock described in Example 4, a mine carried out multiple ore dressing test studies with a test scale of 40 t / h. The preferred parameters (1) and tailings counter-selection parameters (3) were selected, that is, the preferred K value was 50 and the tailings counter-selection K value was 60. The test results are shown in Table 1.

[0047] Table 1

[0048] As a preferred embodiment 8, refer to Figure 1 According to the method for photoelectric physical ore dressing and tailings counter-selection of phosphate ore described in Example 4, on the basis of Example 7, by changing the preferred and tailings counter-selection parameters, the preferred parameters (2) and tailings counter-selection parameters (3) are selected, that is, the preferred K value is 55, the tailings counter-selection K value is 60, and other operations remain unchanged, so as to reduce the final tailings comprehensive grade. A mine carried out multiple mineral processing tests with a test scale of 40t / h. The test results are shown in Table 2.

[0049] Table 2

[0050] As a preferred embodiment 9, refer to Figure 1 According to the method for photoelectric physical ore dressing and tailings counter-selection of phosphate ore described in Example 4, on the basis of Example 7, by changing the preferred and tailings counter-selection parameters, the preferred parameters (2) and tailings counter-selection parameters (2) are selected, that is, the preferred K value is 55, the tailings counter-selection K value is 55, and other operations remain unchanged, so as to reduce the final tailings comprehensive grade and improve the overall mineral processing yield, so as to maximize the mine production efficiency. A mine carried out multiple mineral processing test studies with a test scale of 40t / h. The test results are shown in Table 3.

[0051] Table 3

[0052] Note: Experimental research has found that the photoelectric physical mineral processing and tailings counter-selection process is suitable for an ore with an overall grade of 18%-22%, and an overall mineral processing yield of 55%-65%.

[0053] According to the geological report of the mining area, the industrial types of phosphate ore in the mine include calcium (magnesium) phosphate, silicon calcium (magnesium) phosphate, calcium (magnesium) siliceous collophosphate and silicon phosphate. The comprehensive grade of silicon calcium (magnesium) collophosphate is 22.74%-29.36%, and the comprehensive grade of calcium (magnesium) siliceous collophosphate is 19.65%-30.68%, which meets the applicable range of the above-mentioned raw ore comprehensive grade. The present invention is applicable to silicon calcium (magnesium) collophosphate and calcium (magnesium) siliceous collophosphate in phosphate mining. The process is aimed at the recycling of these two types of ores. At present, the comprehensive utilization of tailings has not been promoted in the surrounding areas, and it has broad prospects in the same industry.

Claims

1. A system for photoelectric physical beneficiation of phosphate ore and reverse separation of tailings, characterized in that: It includes a raw ore temporary storage subsystem, a crushing and screening subsystem, a photoelectric ore dressing subsystem and a tailings counter-selection subsystem which are connected in sequence; The raw ore temporary storage subsystem includes an ore receiving bin storing raw ore; The crushing and screening molecular system includes a jaw crusher, an ore grading screen and a cone crusher, and the jaw crusher, the ore grading screen and the cone crusher are coordinated through a plurality of belt conveyors to form a two-stage one-closed-circuit crushing system; The photoelectric ore dressing subsystem comprises a powder removal screen and a raw ore photoelectric separator connected in sequence; The tailings counter-selection subsystem includes a tailings photoelectric separator.

2. A system for photoelectric physical ore dressing and tailings counter-selection of phosphate ore according to claim 1, characterized in that: The discharge end of the ore receiving bin is connected to the feed end of the jaw crusher through the ore feeder, the discharge end of the jaw crusher is connected to the feed end of the raw ore grading screen through the first belt conveyor, the large-particle discharge end of the raw ore grading screen is connected to the feed of the cone crusher through the second belt conveyor, the discharge end of the cone crusher returns the material to the feed end of the raw ore grading screen through the third belt conveyor, and the product discharge end of the raw ore grading screen is connected to the feed end of the intermediate storage bin through the fourth belt conveyor.

3. A system for photoelectric physical ore dressing and tailings counter-selection of phosphate ore according to claim 2, characterized in that: The discharge end of the intermediate storage bin is connected to the feed end of the powder removal screen through a feeder, the large particle size discharge end of the powder removal screen is connected to the feed end of the raw ore photoelectric sorting machine through the fifth belt conveyor, and the tailings discharge end of the raw ore photoelectric sorting machine is connected to the feed end of the tailings photoelectric sorting machine through the sixth belt conveyor.

4. A system for photoelectric physical ore dressing and tailings counter-selection of phosphate ore according to claim 3, characterized in that: The raw ore photoelectric separator and tailings photoelectric separator are both TDS intelligent dry separators that utilize X-ray identification.

5. A method for photoelectric physical beneficiation of phosphate ore and reverse separation of tailings, characterized in that: The photoelectric physical beneficiation and tailings counter-separation system for phosphate ore as claimed in any one of claims 1 to 4 is used to perform photoelectric physical beneficiation and tailings counter-separation on phosphate ore, comprising the following steps: S1. Ore preparation: The underground ore is transported by car to the ore storage yard for stacking. After the small drilling excavator initially breaks the large pieces of ore, the shovel loader pushes it into the ore receiving bin of the ore temporary storage subsystem; S2. Crushing and screening: The raw ore is fed into the jaw crusher of the crushing and screening molecular system through the ore feeder under the ore receiving bin for primary crushing. After the primary crushing, the raw ore enters the raw ore grading screen for classification. The screened material is fed into the cone crusher for secondary crushing through the belt conveyor. After the secondary crushing, the raw ore is transferred to the raw ore grading screen for screening through the belt conveyor, realizing a two-stage one closed-circuit crushing system; S3, photoelectric beneficiation of raw ore: the raw ore formed by the screening system is transported to the intermediate warehouse by the belt conveyor for storage, and is fed to the powder removal screen of the photoelectric beneficiation subsystem through the under-warehouse feeder to remove the powder ore and store it. The remaining ore is intelligently sorted by the raw ore photoelectric separator to obtain concentrate and tailings; S4. Photoelectric reverse separation of tailings: The primary tailings are transported by belt conveyors to the tailings reverse separation subsystem, and are identified and sorted by tailings photoelectric sorting machines to obtain phosphate ore and final tailings. The phosphate ore is transported to the ore dump for storage, and the tailings are transferred to the tailings dump for storage.

6. The method for photoelectric physical beneficiation of phosphate ore and reverse separation of tailings according to claim 5, characterized in that: The primary crushing in S2 requires the particle size to be crushed to less than 100 mm, the raw ore grading screen is graded according to the particle size of 40 mm, the screened material exceeding 40 mm enters the secondary crushing, and the material below 40 mm enters S3; The powder removal screen in S3 is classified according to 10mm, and removes powder ore below 10mm.

7. The method for photoelectric physical beneficiation of phosphate ore and reverse separation of tailings according to claim 5, characterized in that: The original ore photoelectric separator in S3 and the tailings photoelectric separator in S4 are of the same model, and corresponding sorting coefficient K values ​​are set according to different phosphate ores. The relative phosphate ore grade is positively correlated with the sorting coefficient K value.

8. The method for photoelectric physical beneficiation of phosphate ore and reverse separation of tailings according to claim 7, characterized in that: The sorting coefficient K value of the tailings photoelectric separator in S4 is not less than the sorting coefficient K value of the original ore photoelectric separator in S3.

9. The method for photoelectric physical beneficiation of phosphate ore and reverse separation of tailings according to claim 8, characterized in that: The photoelectric separator for raw ore in S3 and the photoelectric separator for tailings in S4 are both equipped with three sets of sorting coefficient K values, which are 50, 55 and 60 respectively, and are applicable to the comprehensive grade of raw ore of 18%-22%.

10. The method for photoelectric physical beneficiation of phosphate ore and reverse separation of tailings according to claim 9, characterized in that: The photoelectric separator for raw ore in S3 and the photoelectric separator for tailings in S4 both use high-speed variable-frequency motors to drive a PU conveyor belt with a bandwidth of 1.6 m. The speed is stably controlled at 1985 r / min, and the conveyor belt speed is stably controlled at 2.8 m / s.

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