A method for producing a multi-stage nepheline concentrate powder

Abstract

The application discloses a kind of multi-stage nepheline concentrate powder production methods, comprising: step 1: nepheline raw ore is crushed, washing, middle crushing, first screening classification, fine crushing, obtains nepheline powder and slurry I;Step 2: nepheline powder is ground, second screening classification, first hydrocyclone classification, obtain coarse-grained ore pulp and argillaceous ore pulp;Step 3: coarse-grained ore pulp is obtained by coarse-grained wet classification magnetic separation, coarse concentrate I, coarse-grained tailings;Argillaceous ore pulp is obtained by second hydrocyclone classification, fine-grained wet classification magnetic separation, coarse concentrate II, slurry II and fine-grained tailings;Step 4: coarse concentrate I is concentrated, dried, dry magnetic separation classification, ball milling, wind classification, obtains first grade nepheline concentrate and second grade nepheline concentrate;Coarse concentrate II is dehydrated, dried, obtains third grade nepheline concentrate.The comprehensive second hydrocyclone classification, wet magnetic separation, dry magnetic separation, multi-scale grinding, can simultaneously carry out the production of three high-quality nepheline concentrate powder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mineral processing, and in particular to a method for producing multi-stage nepheline concentrate powder. BACKGROUND

[0002] In the 21st century, mankind has entered an era of rapid development of high-tech, a large number of emerging industries have emerged, production technology continues to improve, production processes continue to innovate, and the development of new products is becoming increasingly active, bringing great changes to traditional industries, and prompting non-metallic mineral materials to gradually develop towards ultra-fining, functionalization, high performance, and compounding, and their application market will be even broader.

[0003] Nepheline, a feldspar-like mineral in the framework silicate, is generated under the condition of unsaturated silicon dioxide and is a marker mineral in sodium-rich and silicon-poor alkaline rocks, often occurring in nepheline syenite, aegirine nepheline syenite, and phosphorus nepheline syenite. Natural nepheline has a morphology similar to that of quartz and properties similar to those of alkaline feldspar, and its theoretical chemical composition contains 44% SiO2 and 33% Al2O3, making it a mineral raw material widely used in the glass and ceramic industry.

[0004] Currently, among the 16 nepheline ore deposits in the country, only two have been developed and utilized. One is the Pinghe Mine in Nanjiang County, Sichuan Province, which mainly produces nepheline concentrate powder, and the other is the Xianghongdian Mine in Jinzhai County, Anhui Province. These types of deposits are generally large in scale, have good mining conditions, are suitable for large-scale industrial mining, have high effective components, and good fluxing properties. However, the main drawback is that the ore contains a high amount of iron, which needs to be removed before utilization. In addition, the nepheline ore extracted from the mining site contains a certain amount of sand, which seriously affects the quality of the final nepheline products in the beneficiation plant and cannot meet the purity and particle size requirements.

[0005] A method for nepheline beneficiation (CN107262268A) discloses that the nepheline ore is crushed into nepheline powder after pretreatment, and the nepheline powder is separated into magnetic ore powder and black tailings slurry after magnetic separation. The magnetic ore powder is separated into wet powder slurry and white tailings slurry after flocculation, concentration, and deep-cone thickener separation. The wet powder slurry is filtered and dehydrated to obtain a wet powder product. The white tailings slurry is filtered after concentration, deep-cone thickener separation, and ceramic filter filtration to obtain a first ceramic-grade product with a particle size of -200-325 mesh. The black tailings slurry is concentrated in a concentration tank and then classified by a classifier to obtain coarse and fine particle products. The wet powder product is dried to obtain a dust collector product. The wet powder product is dried and air classified to obtain a concentrate product and a second ceramic-grade product. The present patent discloses removing iron by magnetic separation, and then obtaining different grades of nepheline ore powder products through dehydration and classification operations. The particle size of the optimal first ceramic-grade product is -200-325 mesh, and the product quality is not high. SUMMARY

[0006] The application aims at solving the problems in the prior art, and provides a multi-stage nepheline concentrate production method, which can produce three-stage high-quality nepheline concentrate, and the particle size of the nepheline concentrate is greatly reduced, and the whiteness of the product is improved.

[0007] In a first aspect, the application provides a multi-stage nepheline concentrate production method, comprising:

[0008] Step 1: nepheline ore pretreatment, the nepheline ore is subjected to coarse crushing, ore washing, medium crushing, first screening and grading, and fine crushing to obtain nepheline powder and slurry I;

[0009] Step 2: the nepheline powder is subjected to grinding, second screening and grading, and first hydrocyclone classification to obtain coarse-grained ore slurry and argillaceous ore slurry;

[0010] Step 3: the coarse-grained ore slurry is subjected to coarse-grained wet classification and magnetic separation to obtain coarse concentrate I and coarse-grained tailings;

[0011] The argillaceous ore slurry is subjected to second hydrocyclone classification, fine-grained wet classification and magnetic separation to obtain coarse concentrate II, slurry II and fine-grained tailings;

[0012] Step 4: the coarse concentrate I is subjected to concentration, drying and dry magnetic separation to obtain first-stage nepheline concentrate and second-stage nepheline concentrate, and the first-stage nepheline concentrate and the second-stage nepheline concentrate are subjected to corresponding ball milling and air classification to obtain first-stage nepheline concentrate and second-stage nepheline concentrate;

[0013] The coarse concentrate II is subjected to dehydration and drying to obtain third-stage nepheline concentrate;

[0014] Step 5: the first-stage nepheline concentrate, the second-stage nepheline concentrate and the third-stage nepheline concentrate are respectively sent to corresponding packaging systems for metering and packaging to obtain finished products.

[0015] Further, it further comprises step 6:

[0016] The slurry I and the slurry II are sent to a thickener for concentration, and after concentration, dehydration is performed by a belt vacuum filter to obtain tailings and backwater;

[0017] The coarse-grained tailings are sent to a deep-cone thickener for concentration, and after concentration, dehydration is performed by a disc-type filter press to obtain tailings I and backwater;

[0018] The fine-grained tailings are sent to a deep-cone thickener for concentration, and after concentration, dehydration is performed by a ceramic filter to obtain tailings II and backwater.

[0019] Further, in step 1:

[0020] The nepheline raw ore is sent to a jaw crusher for coarse crushing to obtain coarse nepheline ore particles;

[0021] The coarse nepheline ore particles are sent to a washing screen for washing to obtain medium nepheline ore particles and a slurry I;

[0022] The medium nepheline ore particles are sent to a cone crusher for medium crushing to obtain fine nepheline ore particles;

[0023] The fine nepheline ore particles are sent to a vibrating screen for first screening and grading, the undersize of the vibrating screen is a nepheline powder, and the oversize of the vibrating screen is sent to a fine cone for fine crushing and then returned to the vibrating screen.

[0024] Further, the washing screen comprises an upper screen and a lower screen, the upper screen has a hole diameter of 100 mm, and the lower screen has a hole diameter of 1 mm.

[0025] The vibrating screen has at least two screens, and the lowermost screen has a hole diameter of 5 mm.

[0026] Further, the step 2 specifically comprises:

[0027] The nepheline powder is conveyed to a rod mill by a vibrating feeder for grinding, and then enters a high-frequency vibrating screen for second screening and grading, the oversize of the high-frequency vibrating screen is returned to the rod mill, and the undersize is conveyed to a first water flow cyclone for first hydrocyclone grading to obtain a coarse particle grade ore slurry and a argillaceous ore slurry, the coarse particle grade ore slurry is the underflow of the first hydrocyclone grading, and the argillaceous ore slurry is the overflow of the first hydrocyclone grading.

[0028] Further, the high-frequency vibrating screen has a screen hole of 30 mesh.

[0029] Further, in the step 3:

[0030] The coarse particle grade wet type grading magnetic separation adopts a strong magnetic plate type magnetic separator, a 1.3T high gradient magnetic separator and a 1.5T high gradient magnetic separator in series.

[0031] The argillaceous ore slurry enters a second water flow cyclone for second hydrocyclone grading to obtain underflow and overflow of the second hydrocyclone grading, the underflow of the second hydrocyclone grading is subjected to fine particle grade wet type grading magnetic separation to obtain a coarse concentrate II, and the overflow of the second hydrocyclone grading is the slurry II.

[0032] The fine particle grade wet type grading magnetic separation adopts a strong magnetic plate type magnetic separator, a 1.3T slurry magnetic separator and a 1.5T slurry magnetic separator in series.

[0033] Further, the first water flow cyclone is a 250mm water flow cyclone, and the second water flow cyclone is a 150mm water flow cyclone.

[0034] Further, in step 4:

[0035] After the coarse concentrate I is dried in the drying cylinder, the drying cylinder is 30 meters long, dry magnetic separation grading is carried out through two rare earth strong magnetic roller magnetic separators in series, iron removal is carried out through the first rare earth strong magnetic roller magnetic separator, grading is carried out through the second rare earth strong magnetic roller magnetic separator, and first nepheline ore powder and second nepheline ore powder are obtained, and the rare earth strong magnetic roller magnetic separator is divided into four gradients.

[0036] After the coarse concentrate II is dewatered through the ceramic filter, it is dried in the drying machine, the drying machine is 20 meters long, and third nepheline ore powder is obtained.

[0037] Further, after the first nepheline ore powder enters the first ball mill, ball milling is carried out, and then air classification is carried out in the first air classifier, and first nepheline concentrate is obtained, the content of 200 mesh in the first nepheline concentrate is more than 95%, and the iron content is less than or equal to 0.15%.

[0038] After the second nepheline ore powder enters the second ball mill, ball milling is carried out, and then air classification is carried out in the second air classifier, and second nepheline concentrate is obtained, the content of 200 mesh in the second nepheline concentrate is more than 95%, and the iron content is less than or equal to 0.20%.

[0039] The coarse concentrate II is dewatered through the ceramic filter, and then dried through the drying machine, and third nepheline concentrate is obtained, the particle size of the third nepheline concentrate is -150 mesh to 700 mesh, and the iron content is less than or equal to 0.30%.

[0040] The beneficial effects of the present application are:

[0041] (1) In the present application, the content of soil impurities in the nepheline ore powder is reduced through the washing operation, the washing screen includes upper and lower layers, the upper layer screen has a pore size of 100 mm, and the lower layer screen has a pore size of 1 mm, different sizes of nepheline ore particles are obtained through the washing screen, and then the nepheline fine ore particles are obtained through crushing, and then the nepheline fine ore particles are sent through the first screening grading to obtain the nepheline powder material; the material on the screen of the vibrating screen is sent to the fine cone for fine crushing, and then returned to the vibrating screen. The nepheline ore powder with low soil impurity content is obtained through washing and multiple crushing, which can ensure the product quality and is also beneficial to the subsequent high gradient magnetic separation operation.

[0042] (2) In the beneficiation operation stage, grading is realized through the first hydrocyclone, and two parallel multi-stage magnetic separation processes are adopted after grading to carry out beneficiation operation of different magnetic field strengths, and the two processes do not interfere with each other, and different quality coarse concentrates I and coarse concentrates II are produced through the two processes.

[0043] (3) In order to further improve the product quality of nepheline concentrate powder, the magnetic separation operation of the ore is strengthened in the production process, and at the same time, the processing capacity of the magnetic separation operation equipment (i.e. the load coefficient of the equipment is reduced) and the magnetic field strength of the magnetic separator are appropriately increased, and for the rough concentrate I, the dry magnetic separation operation is adopted for the magnetic separation grading operation, and two rare earth roller magnetic separators are adopted in the magnetic separation grading process, the first said rare earth strong magnetic roller magnetic separator is used for magnetic separation and iron removal, and the second said rare earth strong magnetic roller magnetic separator is used for grading, so as to obtain first grade nepheline concentrate powder and second grade nepheline concentrate powder, so as to ensure that the concentrator can stably produce qualified products and high-grade products for a long time.

[0044] (4) The muddy ore slurry obtained by the first hydrocyclone classification contains a high content of soil impurities, in order to improve the magnetic separation quality of the muddy ore slurry, the muddy ore slurry is classified by the second hydrocyclone before magnetic separation, and the mud is removed, and then the rough concentrate II is obtained by multi-stage magnetic separation, and the third grade nepheline concentrate powder is obtained after dehydration and drying of the rough concentrate II. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0046] Figure 1 It is a flowchart of a multi-stage nepheline concentrate powder production method.

[0047] Figure 2 It is a flowchart of the treatment process of the coarse and fine particle tailings discharged in the muddy water I, muddy water II and wet magnetic separation operation.

[0048] Figure 3 It is a flowchart of step 1.

[0049] Figure 4 It is a flowchart of step 3.

[0050] Figure 5 It is a flowchart of step 4. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0052] AsFigure 1 As shown, the embodiment of the present application provides a multi-stage nepheline concentrate production method, comprising the following steps:

[0053] Step 1: nepheline ore pretreatment, the nepheline ore is subjected to coarse crushing, ore washing, medium crushing, first screening classification, and fine crushing to obtain nepheline powder and slurry I;

[0054] Step 2: the nepheline powder is subjected to grinding, second screening classification, and first hydrocyclone classification to obtain coarse-grained ore slurry and argillaceous ore slurry;

[0055] Step 3: the coarse-grained ore slurry is subjected to coarse-grained wet classification magnetic separation to obtain coarse concentrate I and coarse-grained tailings;

[0056] The argillaceous ore slurry is subjected to second hydrocyclone classification and fine-grained wet classification magnetic separation to obtain coarse concentrate II, slurry II, and fine-grained tailings;

[0057] Step 4: the coarse concentrate I is subjected to concentration, drying, and dry magnetic separation to obtain first-stage nepheline concentrate and second-stage nepheline concentrate, and the first-stage nepheline concentrate and the second-stage nepheline concentrate are subjected to corresponding ball milling and air classification to obtain first-stage nepheline concentrate and second-stage nepheline concentrate;

[0058] The coarse concentrate II is subjected to dewatering and drying to obtain third-stage nepheline concentrate;

[0059] Step 5: the first-stage nepheline concentrate, the second-stage nepheline, and the third-stage nepheline concentrate are respectively sent to corresponding packaging systems for metering and packaging to obtain finished products.

[0060] The present embodiment reduces the content of soil impurities in the nepheline powder through ore washing operations, and obtains nepheline medium ore particles of different sizes through the ore washing screen, and then obtains nepheline fine ore particles through medium crushing, and then sends the nepheline fine ore particles to the fine crushing cone through the screen material of the vibrating screen, and then returns to the vibrating screen. The nepheline powder with low soil impurity content obtained through ore washing and multiple crushing can ensure product quality and is also beneficial to subsequent high-gradient magnetic separation operations.

[0061] In the beneficiation operation stage, classification is realized through first hydrocyclone classification, and two parallel multi-stage magnetic separation processes are used after classification for beneficiation operations of different magnetic field strengths without interference, and different quality coarse concentrate I and coarse concentrate II are produced through the two processes.

[0062] In order to further improve the product quality of nepheline concentrate powder, the magnetic separation operation of the ore is strengthened in the production process, and at the same time, the processing capacity of the magnetic separation operation equipment (i.e. the load coefficient of the equipment is reduced) and the magnetic field strength of the magnetic separator are appropriately increased. At the same time, the coarse concentrate I is subjected to dry magnetic separation operation for magnetic separation grading operation, and first-grade and second-grade nepheline mineral powders of different qualities are obtained.

[0063] The muddy ore slurry obtained by the first hydrocyclone classification contains a high content of soil impurities. In order to improve the magnetic separation quality of the muddy ore slurry, the muddy ore slurry is subjected to a second hydrocyclone classification before magnetic separation to realize desliming, and then a coarse concentrate II is obtained through multi-stage magnetic separation. The coarse concentrate II is dehydrated and dried to obtain a third-grade nepheline mineral powder.

[0064] In the production process, muddy water I, muddy water II and coarse and fine tailings discharged in the wet magnetic separation operation are produced. In order to realize efficient treatment of the tailings and recycling of water resources, the present embodiment further includes step 6, as shown in Figure 2

[0065] The muddy water I and the muddy water II are sent to the thickener for concentration, and then dehydrated by the belt vacuum filter to obtain tail mud and backwater.

[0066] The coarse tailings are sent to the deep-cone thickener for concentration, and then dehydrated by the disc-type filter press to obtain tailings I and backwater.

[0067] The fine tailings are sent to the deep-cone thickener for concentration, and then dehydrated by the ceramic filter to obtain tailings II and backwater.

[0068] In the present embodiment, the backwater produced can flow into the backwater pool for recycling, and the tail mud, tailings I and tailings II obtained can be further sold or used to prepare organic fertilizer or building materials.

[0069] Step 1 is used to realize the pretreatment of the nepheline raw ore and the preliminary treatment of the impurities in the nepheline raw ore, as shown in Figure 3 The specific operation processes in step 1 are as follows:

[0070] The nepheline raw ore is sent to the jaw crusher for coarse crushing to obtain nepheline coarse ore particles.

[0071] ​In this embodiment, according to the ore block size, processing capacity and ore hardness and toughness, etc., we select the JC1000 type jaw crusher as the coarse crushing operation equipment. The JC series jaw crusher is a new generation product successfully developed by introducing international advanced technology and research results on the basis of the original traditional PE series jaw crusher manufacturing experience in China, and has the international advanced level. The yield can be increased by more than 30%, and the unit operation cost can be reduced by more than 20%, which is an ideal coarse crushing equipment.

[0072] The nepheline coarse ore particles are sent to the washing screen for washing to obtain nepheline medium ore particles and slurry I.

[0073] The nepheline medium ore particles are sent to the cone crusher for medium crushing to obtain nepheline fine ore particles.

[0074] In this embodiment, according to the material block size, processing capacity and ore properties of the nepheline coarse ore particles obtained after coarse crushing operation, through calculation, a heavy single-cylinder hydraulic cone crusher is selected as the medium crushing operation equipment. The machine has the characteristics of small volume, light weight, large installed power and super strong firmness.

[0075] The nepheline fine ore particles are sent to the vibrating screen for the first screening and grading, the under-screen material of the vibrating screen is nepheline powder, and the oversize material of the vibrating screen is sent to the fine cone for fine crushing and then returned to the vibrating screen.

[0076] In this embodiment, the vibrating screen is used to realize the classification and screening of nepheline fine ore particles to obtain nepheline powder. The oversize particles of the vibrating screen are too large to meet the requirements of subsequent operations, so they are sent to the fine cone for fine crushing and then returned to the vibrating screen. Through the circulation of screening and fine crushing, nepheline powder is obtained.

[0077] The single-drive roller press is used as the fine crushing operation equipment. The machine has the characteristics of simple and compact structure, light weight, small volume and convenient operation and maintenance. More importantly, the amount of ultra-fine powder is small, which is an ideal sand making equipment in the quartz, potassium and sodium feldspar and nepheline industries in China.

[0078] In order to improve the impurity removal efficiency of the washing screen, in this embodiment, the washing screen includes an upper screen and a lower screen. The aperture of the upper screen is 100 mm, and the aperture of the lower screen is 1 mm.

[0079] In this embodiment, the washing operation is carried out on the screens with different apertures to reduce the content of soil impurities. At the same time, different sizes of nepheline medium ore particles are obtained through the washing screen. The ore particles with different particle sizes are mixed and crushed through medium crushing to obtain nepheline fine ore particles.

[0080] The nepheline fine ore is screened by a vibrating screen to obtain nepheline powder. In order to realize efficient screening of the nepheline fine ore, the vibrating screen has at least two layers of screens, and the screen hole of each layer of screen is 12 mm. In this embodiment, the vibrating screen has three layers of screens, and the screen hole of each layer of screen is 12 mm. The vibrating screen is arranged in three stages, that is, after the first stage of screening is completed, the material enters the second stage of screening, and after the second stage of screening is completed, the material enters the third stage of screening, thereby further improving the screening efficiency.

[0081] In this embodiment, the vibrating screen has three layers of screens, and the screen hole of each layer of screen is 12 mm. The vibrating screen is arranged in three stages, that is, after the first stage of screening is completed, the material enters the second stage of screening, and after the second stage of screening is completed, the material enters the third stage of screening, thereby further improving the screening efficiency.

[0082] In this embodiment, step 2 is specifically as follows:

[0083] The nepheline powder is conveyed to a rod mill by a vibrating feeder for grinding, and after grinding, the material is subjected to second screening and classification by a high-frequency vibrating screen. The oversize of the high-frequency vibrating screen returns to the rod mill, and the undersize is conveyed to a first hydrocyclone for first hydrocyclone classification to obtain coarse-grained ore slurry and argillaceous ore slurry. The coarse-grained ore slurry is the underflow of the first hydrocyclone classification, and the argillaceous ore slurry is the overflow of the first hydrocyclone classification.

[0084] According to the ore processing capacity and the fineness requirement of the ground product, a wet rod mill is designed for grinding operation. According to the amount of ore slurry discharged by the wet grinding operation, the material concentration and the product fineness, the second screening and classification is designed as wet classification. The high-frequency vibrating screen adopts a folded straight-line vibrating screen, which has large processing capacity, good screening and classification effect, and is not easy to block the screen mesh. The screen hole of the high-frequency vibrating screen is 30 mesh.

[0085] The coarse-grained ore slurry and the argillaceous ore slurry are obtained through step 2, and step 3 is a magnetic separation operation. The flow of step 3 is as shown in Figure 4

[0086] The coarse-grained wet classification magnetic separation adopts a strong magnetic plate-type magnetic separator, a 1.3T high-gradient magnetic separator and a 1.5T high-gradient magnetic separator in series.

[0087] The argillaceous ore slurry enters a second hydrocyclone for second hydrocyclone classification to obtain underflow and overflow of the second hydrocyclone classification. The underflow of the second hydrocyclone classification is subjected to fine-grained wet classification magnetic separation to obtain coarse concentrate II, and the overflow of the second hydrocyclone classification is slurry II.

[0088] The fine-grained wet classification magnetic separation adopts a strong magnetic plate-type magnetic separator and two slurry magnetic separators in series. Specifically, the fine-grained wet classification magnetic separation adopts a strong magnetic plate-type magnetic separator, a 1.3T slurry magnetic separator and a 1.5T slurry magnetic separator in series.

[0089] ​In this embodiment, in the beneficiation operation stage, classification is realized by the first hydrocyclone classification, and after classification, two parallel multi-stage magnetic separation processes are adopted to carry out beneficiation operation of different magnetic field strengths. For the coarse particle level wet classification magnetic separation operation, three magnetic separators with different magnetic media and different magnetic field strengths are adopted according to the material fineness and processing capacity. For the fine particle level wet classification magnetic separation process, a strong magnetic plate type magnetic separator and two slurry magnetic separators are adopted. The above magnetic separation operation equipment works stably, has high magnetic field strength, and has good separation effect.

[0090] In order to realize the classification of different levels of products, in this embodiment, the first water flow cyclone is a 250mm water flow cyclone, and the second water flow cyclone is a 150mm water flow cyclone.

[0091] Different specifications of rough concentrates are obtained through step 3, and further purification and classification of products are carried out through step 4. The specific process of step 4 is shown in Figure 5 .

[0092] In step 4:

[0093] After the rough concentrate I enters the drying cylinder to complete drying, dry magnetic separation classification is carried out through two series of rare earth strong magnetic roller type magnetic separators. Iron is removed through the first rare earth strong magnetic roller type magnetic separator. Classification is carried out through the second rare earth strong magnetic roller type magnetic separator to obtain first nepheline mine powder and second nepheline mine powder. The rare earth strong magnetic roller type magnetic separator is divided into four gradients.

[0094] After the rough concentrate II is dehydrated through the ceramic filter, it enters the dryer to be dried to obtain third nepheline mine powder.

[0095] In this embodiment, in order to further improve the product quality of the nepheline concentrate powder, the magnetic separation operation of the ore is strengthened in the production process, and at the same time, the processing capacity of the magnetic separation operation equipment (i.e. the load coefficient of the equipment is reduced) and the magnetic field strength of the magnetic separator are appropriately increased. At the same time, for the rough concentrate I, dry magnetic separation operation is adopted for magnetic separation classification operation. Two rare earth roller type magnetic separators are adopted in the magnetic separation classification process. Iron is removed through the first rare earth strong magnetic roller type magnetic separator. Classification is carried out through the second rare earth strong magnetic roller type magnetic separator to obtain first nepheline mine powder and second nepheline mine powder, so as to ensure that the beneficiation plant can stably produce qualified products and high-grade products for a long time.

[0096] In order to further improve the product quality, reduce the particle size of the nepheline mine powder, and improve the whiteness of the product, in this embodiment, the first nepheline mine powder and the second nepheline mine powder are respectively subjected to ball milling and classification to improve the product quality.

[0097] After the first nepheline mine powder enters the first ball mill, ball milling is carried out, and then air classification is carried out through the first air classifier to obtain first nepheline concentrate. The content of 200 mesh in the first nepheline concentrate is more than 95%, and the iron content is ≤0.15%.

[0098] The secondary nepheline ore powder is ball milled after entering the secondary ball mill, and then is air classified in the secondary air classifier to obtain the secondary nepheline concentrate, wherein the content of 200 mesh in the secondary nepheline concentrate is more than 95%, and the iron content is less than or equal to 0.20%.

[0099] The coarse concentrate II is dehydrated by the ceramic filter, and then is dried by the dryer to obtain the tertiary nepheline concentrate, wherein the particle size of the tertiary nepheline concentrate is-150 mesh to 700 mesh, and the iron content is less than or equal to 0.30%.

[0100] The above embodiments are the preferred implementation schemes of the present application, and any obvious replacement without departing from the inventive concept of the present application is within the protection scope of the present application.

Claims

1. A method for producing a multi-stage nepheline concentrate fines, characterized by, The method comprises the following steps: Step 1: pretreatment of nepheline ore, the nepheline ore is subjected to coarse crushing, ore washing, medium crushing, first screening and grading, and fine crushing to obtain nepheline powder and slurry I; Step 2: the nepheline powder is subjected to grinding, second screening and grading, and first hydrocyclone classification to obtain coarse-grained ore slurry and argillaceous ore slurry; Step 3: the coarse-grained ore slurry is subjected to coarse-grained wet classification and magnetic separation to obtain coarse concentrate I and coarse-grained tailings; the argillaceous ore slurry is subjected to second hydrocyclone classification and fine-grained wet classification and magnetic separation to obtain coarse concentrate II, slurry II and fine-grained tailings; Step 4: the coarse concentrate I is subjected to concentration, drying and dry magnetic separation to obtain first-grade nepheline ore powder and second-grade nepheline ore powder, and the first-grade nepheline ore powder and the second-grade nepheline ore powder are subjected to corresponding ball milling and air classification to obtain first-grade nepheline concentrate and second-grade nepheline concentrate; the coarse concentrate II is subjected to dehydration and drying to obtain third-grade nepheline concentrate; Step 5: the first-grade nepheline concentrate, the second-grade nepheline concentrate and the third-grade nepheline concentrate are respectively sent to corresponding packaging systems for metering and packaging to obtain finished products.

2. A method of producing a multi-stage nepheline concentrate fines according to claim 1, characterized by, Step 6 is further included: the slurry I and the slurry II are sent to a thickener for concentration, and then subjected to dehydration by a belt vacuum filter to obtain tailings and backwater; the coarse-grained tailings are sent to a deep-cone thickener for concentration, and then subjected to dehydration by a disc-type filter press to obtain tailings I and backwater; the fine-grained tailings are sent to a deep-cone thickener for concentration, and then subjected to dehydration by a ceramic filter to obtain tailings II and backwater.

3. A method of producing a multi-stage nepheline concentrate fines, according to claim 1, characterized by, In step 1: the nepheline ore is sent to a jaw crusher for coarse crushing to obtain nepheline coarse ore particles; the nepheline coarse ore particles are sent to an ore washing screen for ore washing to obtain nepheline medium ore particles and slurry I; the nepheline medium ore particles are sent to a cone crusher for medium crushing to obtain nepheline fine ore particles; the nepheline fine ore particles are sent to a vibrating screen for first screening and grading, the undersize of the vibrating screen is the nepheline powder, and the oversize of the vibrating screen is sent to a fine crushing cone for fine crushing and then returned to the vibrating screen.

4. A method of producing a multi-stage nepheline concentrate fines according to claim 3, characterized by, The ore washing screen comprises an upper layer screen and a lower layer screen, the upper layer screen has a pore size of 100 mm, and the lower layer screen has a pore size of 1 mm; the vibrating screen has at least two layers of screens, and each layer of screen has a pore size of 12 mm.

5. A method of producing a multi-stage nepheline concentrate fines as claimed in claim 1, wherein, Step 2 is specifically as follows: the nepheline powder is conveyed to a rod mill by a vibrating feeder for grinding, and then subjected to second screening and grading by a high-frequency vibrating screen, the oversize of the high-frequency vibrating screen is returned to the rod mill, and the undersize is conveyed to a first water flow cyclone for first hydrocyclone classification to obtain coarse-grained ore slurry and argillaceous ore slurry, the coarse-grained ore slurry is the underflow of the first hydrocyclone classification, the argillaceous ore slurry is the overflow of the first hydrocyclone classification, and the first water flow cyclone is a 250 mm water flow cyclone.

6. A method of producing a multi-stage nepheline concentrate fines according to claim 5, characterized by, The high-frequency vibrating screen has a screen aperture of 30 mesh.

7. A method of producing a multi-stage nepheline concentrate fines according to claim 1, characterized by, In step 3: the coarse-grained wet classification and magnetic separation adopts a series connection of a strong magnetic plate-type magnetic separator, a 1.3T high-gradient magnetic separator and a 1.5T high-gradient magnetic separator; The argillaceous ore pulp enters a second water flow cyclone for second hydrocyclone classification, to obtain a second hydrocyclone classification underflow and overflow, the second hydrocyclone classification underflow is subjected to fine grade wet classification magnetic separation to obtain coarse concentrate II, and the second hydrocyclone classification overflow is the second slurry II; the second water flow cyclone is a 150 mm water flow cyclone; The fine grade wet classification magnetic separation adopts a series connection of a high-intensity plate magnetic separator, a 1.3T slurry magnetic separator and a 1.5T slurry magnetic separator.

8. A method of producing a multi-stage nepheline concentrate fines according to claim 1, characterized by, In the step 4: After the coarse concentrate I is dried in a drying cylinder, dry magnetic separation is performed by two series-connected rare earth high-intensity roller magnetic separators, iron is removed in the first rare earth high-intensity roller magnetic separator, and classification is performed by the second rare earth high-intensity roller magnetic separator to obtain first nepheline mine powder and second nepheline mine powder, the rare earth high-intensity roller magnetic separator has four gradients; After the coarse concentrate II is dewatered by a ceramic filter, it is dried in a dryer to obtain third nepheline mine powder.

9. A method of producing a multi-stage nepheline concentrate fines according to claim 1, characterized by, The first nepheline mine powder is ball milled in a first ball mill and then air classified in a first air classifier to obtain first nepheline concentrate, the first nepheline concentrate has a 200 mesh content of more than 95% and an iron content of less than or equal to 0.15%; The second nepheline mine powder is ball milled in a second ball mill and then air classified in a second air classifier to obtain second nepheline concentrate, the second nepheline concentrate has a 200 mesh content of more than 95% and an iron content of less than or equal to 0.20%; The coarse concentrate II is dewatered by a ceramic filter and then dried in a dryer to obtain third nepheline concentrate, the third nepheline concentrate has a particle size of -150 mesh to 700 mesh and an iron content of less than or equal to 0.30%.

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