A comprehensive recycling method for nickel ore rough stone

Abstract

The present invention relates to the field of mineral processing technology, and provides a comprehensive recycling and utilization method for nickel ore rough stone, comprising the following steps: crushing; rough magnetic separation; screening and grading the magnetic separation concentrate, and magnetically separating the graded product; screening the magnetic separation tailings; screening the product with a particle size of +8mm to obtain a product with a particle size of +10-30mm, and then purifying the concentrate to obtain lean ore concentrate and tailings stone; and purifying the tailings after magnetic separation of the product with a particle size of -10mm to obtain concentrate coarse sand and tailings fine mud; fine grinding and screening the product with a particle size of +8mm to obtain a product with a particle size of +5-10mm, and then re-selecting and removing impurities to obtain lean ore concentrate and tailings pea stone; and purifying the tailings after magnetic separation of the product with a particle size of -5mm to obtain concentrate fine sand and tailings fine mud. The present invention can achieve efficient and comprehensive recycling and utilization of copper and nickel valuable metal minerals in nickel ore rough stone, reduce the storage of mining waste, and has simple process, low operating cost, and high comprehensive recycling and utilization rate.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, in particular to a comprehensive recycling method for nickel ore rough stones. Background Art

[0002] The mining process produces a large amount of rough stone. For example, a certain group company is a large-scale mining, dressing, smelting, chemical and deep processing joint enterprise. It owns the world's third largest copper-nickel sulfide deposit. It is China's nickel-cobalt production base, platinum group metal refining center and the largest copper production enterprise in the northern region. After decades of mining, its open-pit mine, Longshou Mine, Second Mining Area and Third Mining Area have accumulated a large amount of rough stone (about tens of millions of tons of copper-nickel mining waste). The rough stone is mainly composed of blocky rocks, sand and soil, and contains a small amount of ore (including powdered ore). The rock primarily contains olivine, marble, pyroxene, and a small amount of feldspar, accounting for approximately 96.5% to 97% of the rough stone. Metallic minerals that can be comprehensively recycled from the rough stone include copper-nickel sulfide ores such as pentlandite (0.8% to 0.9%), pyrite (0.03% to 0.05%), and chalcopyrite (0.16% to 0.08%), accounting for approximately 3.0% to 3.5% of the rough stone. The nickel grade of the rough stone is approximately 0.01% to 0.1%. Currently, nickel rough stone is generally stored as solid waste from the mining industry. The amount of stored mines is large, and the amount added each year is also significant. For example, the company's rough stone stockpile is approximately 50 million tons, with approximately 2 million tons added annually. Existing technologies have not yet rationally utilized technical approaches for the comprehensive recycling of nickel rough stone, resulting in a waste of mineral resources. Furthermore, the long-term storage of mining waste requires a large annual investment in comprehensive mine environmental management, increasing the burden of comprehensive mine environmental management. Summary of the Invention

[0003] In response to the problems existing in the prior art, the present invention provides a comprehensive recycling and utilization method for nickel ore rough stone, which can achieve efficient comprehensive recycling and utilization of copper and nickel valuable metal minerals in nickel ore rough stone, reduce the storage of mining waste, and has simple process, low operating cost and high comprehensive recycling rate.

[0004] The technical solution of the present invention is:

[0005] A comprehensive recycling method for nickel ore rough stone comprises the following steps:

[0006] Step 1: Crushing

[0007] The nickel ore rough stone is subjected to coarse crushing, medium crushing and fine crushing in sequence to obtain fine crushed rough stone with a particle size of less than 50 mm;

[0008] Step 2: Magnetic roughing

[0009] The finely crushed rough stones are subjected to magnetic separation 1 to obtain concentrate 1 and tailings 1;

[0010] Step 3: Magnetic Selection

[0011] Concentrate 1 is fed into a double-layer vibrating screen for screening 1 to obtain screening products with particle sizes of +20 to -50 mm, +8 to -20 mm, and -8 mm, respectively; the screening products with particle sizes of +20 to -50 mm and +8 to -20 mm are subjected to magnetic separation 2 and magnetic separation 3, respectively, magnetic separation 2 obtains concentrate 2 and tailings 2, magnetic separation 3 obtains concentrate 3 and tailings 3, and both concentrate 2 and concentrate 3 are rich ores; magnetic separation 4 is performed on the screening product with a particle size of -8 mm to obtain concentrate 4 and tailings 4, and magnetic separation 5 is performed on concentrate 4 to obtain concentrate 5 and tailings 5, and concentrate 5 is lean ore 1;

[0012] Step 4: Magnetic separation tailings classification

[0013] Tailings 1, 2, 3, 4 and 5 are combined and fed into a single-layer vibrating screen for screening 2 to obtain screening products with particle sizes of +8 mm and -8 mm respectively;

[0014] Step 5: Stone processing

[0015] The screening product with a particle size of +8mm in step 4 is fed into a double-layer vibrating screen for screening 3 to obtain screening products with particle sizes of +30mm, +10~-30mm, and -10mm respectively; the screening product with a particle size of +30mm is returned to the fine crushing in step 1 for further crushing; the screening product with a particle size of +10~-30mm is fed into an air separator or a jig for purification and impurity removal to obtain concentrate 6 and tailings 6, the tailings 6 being a sundry waste, the concentrate 6 is subjected to magnetic separation 6 to obtain concentrate 7 and tailings 7, the concentrate 7 is a lean ore 4, and the tailings 7 is a stone product; the screening product with a particle size of -10mm is subjected to magnetic separation 9 to obtain concentrate 8 and tailings 8, the concentrate 8 is a lean ore 5, the tailings 8 is washed and purified to obtain concentrate 9 and tailings 9, the concentrate 9 is a coarse sand product, and the tailings 9 is a fine mud product;

[0016] Step 6: Fine sand processing

[0017] The screened product with a particle size of +8 mm in step 4 is fed into a sand making machine for fine grinding, and then fed into a double-layer vibrating screen for screening 4 to obtain screened products with particle sizes of +10 mm, +5 to -10 mm, and -5 mm, respectively; the screened product with a particle size of +10 mm is returned to the sand making machine for regrinding; the screened product with a particle size of +5 to -10 mm is subjected to heavy separation and impurity removal to obtain concentrate 10 and tailings 10, which are waste materials; the concentrate 10 is subjected to magnetic separation 7 to obtain concentrate 11 and tailings 11, which are lean ore 2 and pea stone products; the screened product with a particle size of -5 mm is subjected to magnetic separation 8 to obtain concentrate 12 and tailings 12, which are lean ore 3, and the tailings 12 are washed and purified to obtain concentrate 13 and tailings 13, which are fine sand products and fine mud products.

[0018] Optionally, in step 1, the nickel ore rough stone is subjected to coarse crushing, medium crushing and fine crushing in sequence, specifically comprising: subjecting the rough stone with a particle size of 0 to 1000 mm to a three-stage open-circuit crushing process of coarse crushing, medium crushing and fine crushing in sequence.

[0019] Optionally, the coarse crushing includes transporting the rubble into a steel silo by a forklift truck and then feeding the rubble in the steel silo into a jaw crusher for coarse crushing through an electric vibrating feeder.

[0020] Optionally, the magnetic separation 1, magnetic separation 2, magnetic separation 3, magnetic separation 6, magnetic separation 7, magnetic separation 8, and magnetic separation 9 all use belt magnetic separators, and the magnetic separation 4 and magnetic separation 5 both use drum magnetic separators. The magnetic induction intensity of the magnetic separation 1 is 5000-5500 mT, the magnetic induction intensity of the magnetic separation 2 is 4300-5000 mT, the magnetic induction intensity of the magnetic separation 3 is 3800-4200 mT, the magnetic induction intensity of the magnetic separation 4 is 3600-4000 mT, the magnetic induction intensity of the magnetic separation 5 is 3200-3600 mT, and the magnetic induction intensity of the magnetic separation 6, magnetic separation 7, magnetic separation 8, and magnetic separation 9 are all 4500-5000 mT.

[0021] Optionally, the concentrate 1 includes magnetic copper-nickel sulfide, the tailings 1 includes non-magnetic ore and copper-nickel sulfide ore, the concentrate 2 and the concentrate 3 are both copper-nickel sulfide nickel ores containing 1.0% to 1.5% nickel, the concentrate 5 is a copper-nickel sulfide nickel ore containing 0.5% to 0.8% nickel, the stone purification rate of the concentrate 6 is 97%, the concentrate 7, the concentrate 8, the concentrate 11, and the concentrate 12 are copper-nickel sulfide nickel ores containing 0.3% to 0.6% nickel, and the sand purification rates of the concentrates 9 and 13 are both 99.6%.

[0022] Optionally, in step 5, when an air separator is selected for purification and impurity removal, the wind pressure of the air separator is controlled at 3.5-5.0 KPa; when a jig is selected for purification and impurity removal, the angle of the material dividing baffle a of the jig is 142°, the screen plate stroke is 30 mm, and the screen plate stroke frequency is 310 times / min.

[0023] Optionally, in step 5 and step 6, the water washing purification includes: sending the corresponding tailings into a water washing purification device, controlling the liquid-solid ratio at 7:1 and the screw speed at 40 r / min for purification and separation.

[0024] Optionally, it includes: grading the coarse sand product and the fine sand product to obtain mine filling sand with a particle size of +3.7mm, construction coarse sand of +3.1 to -3.7mm, construction medium sand of +2.3 to -3.0mm, and construction fine sand products of +1.6 to -2.2mm; grading the stone product to obtain crushed stone with a particle size of -15mm and sand and gravel aggregate of +15mm.

[0025] Optionally, the method includes: when sand and gravel are needed to backfill the middle section of a mine, the stone product, coarse sand product, fine sand product and the pebbles product are mixed and used as mine filling sand.

[0026] Optionally, the screened product with a particle size of -8 mm and the fine mud product in step 4 are combined and fine sand and soil are classified to obtain concentrate 14 and tailings 14. The concentrate 14 is organically treated to prepare soil for land reclamation and greening, and the tailings 14 are used as general building materials.

[0027] The beneficial effects of the present invention are:

[0028] The present invention performs coarse crushing, medium crushing and fine crushing on nickel ore rough stones in sequence to obtain fine rough stones with a particle size of less than 50 mm, then performs magnetic rough separation on the fine rough stones, screens and grades the magnetic separation concentrate, and re-magnetizes the graded products to obtain rich ore products containing 1.0% to 1.5% nickel and lean ore products containing 0.5% to 0.8% nickel. At the same time, the tailings after magnetic separation are screened and graded, and then the stone and fine sand are processed and purified, thereby realizing the recovery of nickel and copper valuable metals and obtaining nickel-containing products. It can realize the efficient and comprehensive recycling of copper and nickel valuable metal minerals in nickel ore rough stone, reduce the storage of mining waste, alleviate the environmental pollution of mining industry, and promote the sustainable development of mining economy, with simple process, low operation cost and high comprehensive recycling rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a flow chart of the comprehensive recycling and utilization method of nickel ore rough stone of the present invention in a specific embodiment. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 As shown, the comprehensive recycling method of nickel ore rough stone of the present invention comprises the following steps:

[0032] Step 1: Crushing

[0033] The nickel ore rough stone is subjected to coarse crushing, medium crushing and fine crushing in sequence to obtain fine crushed rough stone with a particle size of less than 50 mm;

[0034] Step 2: Magnetic roughing

[0035] The finely crushed rough stones are subjected to magnetic separation 1 to obtain concentrate 1 and tailings 1;

[0036] Step 3: Magnetic Selection

[0037] Concentrate 1 is fed into a double-layer vibrating screen for screening 1, with the aperture of the upper screen being 20 mm and the aperture of the lower screen being 8 mm, to obtain screening products with particle sizes of +20 to -50 mm, +8 to -20 mm, and -8 mm, respectively; the screening products with particle sizes of +20 to -50 mm and +8 to -20 mm are subjected to magnetic separation 2 and magnetic separation 3, respectively, magnetic separation 2 obtains concentrate 2 and tailings 2, magnetic separation 3 obtains concentrate 3 and tailings 3, and both concentrate 2 and concentrate 3 are rich ores; magnetic separation 4 is performed on the screening product with a particle size of -8 mm to obtain concentrate 4 and tailings 4, and magnetic separation 5 is performed on concentrate 4 to obtain concentrate 5 and tailings 5, and concentrate 5 is lean ore 1;

[0038] Step 4: Magnetic separation tailings classification

[0039] Tailings 1, 2, 3, 4 and 5 are combined and fed into a single-layer vibrating screen for screening 2. The screen mesh size is 8 mm, and the screened products with particle sizes of +8 mm and -8 mm are obtained respectively;

[0040] Step 5: Stone processing

[0041] The screened product with a particle size of +8mm in step 4 is fed into a double-layer vibrating screen for screening 3. The aperture of the upper screen is 30mm and the aperture of the lower screen is 10mm, and screened products with particle sizes of +30mm, +10 to -30mm, and -10mm are obtained; the screened product with a particle size of +30mm is returned to the fine crushing in step 1 for further crushing; the screened product with a particle size of +10 to -30mm is fed into an air separator or a jig for purification and impurity removal by dry and wet methods to obtain The concentrate 6 and tailings 6 are directly discarded, and the tailings 6 are directly discarded by debris such as sawdust, rags, and fillers mixed in the stone. The concentrate 6 is subjected to magnetic separation 6 to obtain concentrate 7 and tailings 7. The concentrate 7 is a lean ore 4, and the tailings 7 is a stone product. The screened product with a particle size of -10mm is subjected to magnetic separation 9 to obtain concentrate 8 and tailings 8. The concentrate 8 is a lean ore 5. The tailings 8 is washed and purified to obtain concentrate 9 and tailings 9. The concentrate 9 is a coarse sand product with a particle size of -10mm, and the tailings 9 is a fine mud product.

[0042] Step 6: Fine sand processing

[0043] The screened product with a particle size of +8mm in step 4 is fed into a sand making machine for fine grinding, and then fed into a double-layer vibrating screen for screening 4. The aperture of the upper screen is 10mm and the aperture of the lower screen is 5mm, and the screened products with particle sizes of +10mm, +5~-10mm, and -5mm are obtained; the screened product with a particle size of +10mm is returned to the sand making machine for re-grinding; the screened product with a particle size of +5~-10mm is re-selected and impurities are removed to obtain concentrate 10 and tailings. Mine 10, tailings 10 are directly discarded debris such as sawdust, rags, and fillers. The concentrate 10 is subjected to magnetic separation 7 to obtain concentrate 11 and tailings 11. The concentrate 11 is a lean ore 2, and the tailings 11 is a pea stone product. The screened product with a particle size of -5 mm is subjected to magnetic separation 8 to obtain concentrate 12 and tailings 12. The concentrate 12 is a lean ore 3. The tailings 12 are washed and purified to obtain concentrate 13 and tailings 13. The concentrate 13 is a fine sand product, and the tailings 13 is a fine mud product.

[0044] In this embodiment, step 1 sequentially crushes the nickel ore rubble through coarse, medium, and fine crushing. Specifically, the rubble with a particle size of 0 to 1000 mm is subjected to a three-stage open-circuit crushing process: coarse, medium, and fine crushing. The coarse crushing involves transporting the rubble into a steel silo using a forklift truck, then feeding the rubble in the steel silo into a jaw crusher via an electric vibrating feeder for coarse crushing.

[0045] The magnetic separations 1, 2, 3, 6, 7, 8 and 9 all use belt magnetic separators, and the magnetic separations 4 and 5 all use drum magnetic separators. The magnetic induction intensity of the magnetic separation 1 is 5000-5500 mT, the magnetic induction intensity of the magnetic separation 2 is 4300-5000 mT, the magnetic induction intensity of the magnetic separation 3 is 3800-4200 mT, the magnetic induction intensity of the magnetic separation 4 is 3600-4000 mT, the magnetic induction intensity of the magnetic separation 5 is 3200-3600 mT, and the magnetic induction intensity of the magnetic separations 6, 7, 8 and 9 are all 4500-5000 mT.

[0046] The concentrate 1 includes magnetic copper-nickel sulfide, the tailings 1 includes non-magnetic ore and a small amount of copper-nickel sulfide ore, the concentrate 2 and the concentrate 3 are both copper-nickel sulfide nickel ores containing 1.0% to 1.5% nickel, the concentrate 5 is a copper-nickel sulfide nickel ore containing 0.5% to 0.8% nickel, the stone purification rate of the concentrate 6 is 97%, the concentrate 7, the concentrate 8, the concentrate 11, and the concentrate 12 are copper-nickel sulfide nickel ores containing 0.3% to 0.6% nickel, and the sand purification rates of the concentrates 9 and 13 are both 99.6%.

[0047] In this embodiment, in step 5, an air separator is selected for purification and impurity removal, and the air pressure of the air separator is controlled at 3.5-5.0 kPa. In another embodiment of the present invention, a jig is selected for purification and impurity removal, and the angle of the material dividing baffle a of the jig is 142°, the screen plate stroke is 30 mm, and the screen plate stroke frequency is 310 times / min.

[0048] In this embodiment, in step 5 and step 6, the water washing and purification includes: sending the corresponding tailings into the water washing and purification device, controlling the liquid-solid ratio at 7:1 and the screw speed at 40r / min for purification and separation.

[0049] The present invention processes stone and fine sand according to the demand for stone and sand. When the demand for stone is large, the product with a particle size of +8mm is directly fed to the screening 3 and enters the stone processing flow for further processing; when the demand for sand is large, the product with a particle size of +8mm is fed to the sand making machine for fine grinding and then enters the sand processing flow for further processing.

[0050] The stone processing and production process produces stone products, coarse sand products, and fine mud products. The fine sand processing and production process produces pea stone products, fine sand products, and fine mud products. In this embodiment, the sand material obtained by water washing and purification has a particle size range of +1.6 to -10 mm. The coarse sand product and fine sand product are subjected to sand material classification to obtain mine filling sand with a particle size of +3.7 mm, construction coarse sand with a particle size of +3.1 to -3.7 mm, construction medium sand with a particle size of +2.3 to -3.0 mm, and construction fine sand with a particle size of +1.6 to -2.2 mm. The stone product is subjected to stone material classification to obtain crushed stone with a particle size of -15 mm and sand and gravel aggregate with a particle size of +15 mm. In another embodiment of the present invention, a large amount of sand and gravel is required for backfilling the middle section of a mine. The stone product, coarse sand product, and fine sand product are not classified but are mixed with the pea stone product and used as mine filling sand.

[0051] In this embodiment, the screened product with a particle size of -8 mm and the fine mud product in step 4 are combined and fine sand and soil are classified to obtain concentrate 14 and tailings 14. The concentrate 14 is organically treated to prepare soil for land reclamation and greening, and the tailings 14 are used as general building materials.

[0052] The rich and lean ore products produced by this method are used in the production process to recover nonferrous and precious metals such as nickel, copper, and cobalt. The stone is used for mine filling, general construction, road construction, and cushioning. The sand is used to make building materials for construction, road construction, and mine filling, replacing some windblown sand. The fine soil is used for general building materials (brick making) or, after organic treatment, for landscaping and greening. This demonstrates the efficient and comprehensive recycling of nickel ore rough stone. Its successful industrial application not only brings significant economic benefits but also addresses environmental protection and mine environmental management issues.

[0053] In the present embodiment, after the nickel ore rough stone is processed in the above steps, 11 products including rich and lean copper-nickel sulfide ores, stone, pea stone, crushed stone, sand and gravel aggregate, mine filling sand, building coarse sand, building medium sand, building fine sand, and fine soil are obtained. The ore produced meets the requirements of the mineral processing plant and is sent to the mine, the stone and sand produced can meet the needs of mine filling and be sent to the mining area, the fine soil and sand material can meet the needs of brick making and be sent to the brick factory, and can also be graded to produce land for landscaping and common building materials (brick making). The landscaping and greening soil produced can be used for mine greening planting experiments. At the beginning of 2020, elm trees and green grass were planted on the flat land filled with rough stone and fine soil. Mine wastewater was used for irrigation. The survival rate of planted trees was high and the green grass grew well. Remarkable results were achieved through one year of experiment. A large area of ​​greening was carried out in 2021, paving the way for subsequent rough stone processing, mine management and greening. In this embodiment, three types of nickel ore rough stones of different ore grades were processed using the method of the present invention. The indicators of the produced copper-nickel sulfide rich ores and lean ores are shown in Table 1.

[0054] Table 1

[0055]

[0056] As can be seen from Table 1 above, the ore (nickel) recovery rate of the present invention is relatively high, and the efficient comprehensive recovery and utilization of copper and nickel valuable metal minerals in nickel ore rough stone can be achieved.

[0057] Obviously, the above embodiments are only some embodiments of the present invention, rather than all embodiments. The above embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention. Based on the above embodiments, all other embodiments obtained by those skilled in the art without making creative work, that is, all modifications, equivalent substitutions and improvements made within the spirit and principles of this application, fall within the scope of protection claimed by the present invention.

Claims

1. A method for comprehensive recycling of nickel ore rough stone, characterized in that: The steps include: Step 1: Crushing The nickel ore rough stone is subjected to coarse crushing, medium crushing and fine crushing in sequence to obtain fine crushed rough stone with a particle size of less than 50 mm; Step 2: Magnetic roughing The finely crushed rough stones are subjected to magnetic separation 1 to obtain concentrate 1 and tailings 1; Step 3: Magnetic Selection Concentrate 1 is fed into a double-layer vibrating screen for screening 1 to obtain screening products with particle sizes of +20 to -50 mm, +8 to -20 mm, and -8 mm, respectively; the screening products with particle sizes of +20 to -50 mm and +8 to -20 mm are subjected to magnetic separation 2 and magnetic separation 3, respectively, magnetic separation 2 obtains concentrate 2 and tailings 2, magnetic separation 3 obtains concentrate 3 and tailings 3, and both concentrate 2 and concentrate 3 are rich ores; magnetic separation 4 is performed on the screening product with a particle size of -8 mm to obtain concentrate 4 and tailings 4, and magnetic separation 5 is performed on concentrate 4 to obtain concentrate 5 and tailings 5, and concentrate 5 is lean ore 1; Step 4: Magnetic separation tailings classification Tailings 1, 2, 3, 4 and 5 are combined and fed into a single-layer vibrating screen for screening 2 to obtain screening products with particle sizes of +8 mm and -8 mm respectively; Step 5: Stone processing The screening product with a particle size of +8mm in step 4 is fed into a double-layer vibrating screen for screening 3 to obtain screening products with particle sizes of +30mm, +10~-30mm, and -10mm respectively; the screening product with a particle size of +30mm is returned to the fine crushing in step 1 for further crushing; the screening product with a particle size of +10~-30mm is fed into an air separator or a jig for purification and impurity removal to obtain concentrate 6 and tailings 6, the tailings 6 being a sundry waste, the concentrate 6 is subjected to magnetic separation 6 to obtain concentrate 7 and tailings 7, the concentrate 7 is a lean ore 4, and the tailings 7 is a stone product; the screening product with a particle size of -10mm is subjected to magnetic separation 9 to obtain concentrate 8 and tailings 8, the concentrate 8 is a lean ore 5, the tailings 8 is washed and purified to obtain concentrate 9 and tailings 9, the concentrate 9 is a coarse sand product, and the tailings 9 is a fine mud product; Step 6: Fine sand processing The screened product with a particle size of +8 mm in step 4 is fed into a sand making machine for fine grinding, and then fed into a double-layer vibrating screen for screening 4 to obtain screened products with particle sizes of +10 mm, +5 to -10 mm, and -5 mm, respectively; the screened product with a particle size of +10 mm is returned to the sand making machine for regrinding; the screened product with a particle size of +5 to -10 mm is subjected to heavy separation and impurity removal to obtain concentrate 10 and tailings 10, which are waste materials; the concentrate 10 is subjected to magnetic separation 7 to obtain concentrate 11 and tailings 11, which are lean ore 2 and pea stone products; the screened product with a particle size of -5 mm is subjected to magnetic separation 8 to obtain concentrate 12 and tailings 12, which are lean ore 3, and the tailings 12 are washed and purified to obtain concentrate 13 and tailings 13, which are fine sand products and fine mud products.

2. The method for comprehensive recycling of nickel ore rough stone according to claim 1, characterized in that: In the step 1, the nickel ore rough stone is subjected to coarse crushing, medium crushing and fine crushing in sequence, specifically comprising: subjecting the rough stone with a particle size of 0 to 1000 mm to a three-stage open circuit crushing process of coarse crushing, medium crushing and fine crushing in sequence.

3. The method for comprehensive recycling of nickel ore rough stone according to claim 2, characterized in that: The coarse crushing includes transporting the rubble into a steel silo by a forklift truck and then feeding the rubble in the steel silo into a jaw crusher for coarse crushing by an electric vibrating feeder.

4. The method for comprehensive recycling of nickel ore rough stone according to claim 1, characterized in that: The magnetic separations 1, 2, 3, 6, 7, 8 and 9 all use belt magnetic separators, and the magnetic separations 4 and 5 all use drum magnetic separators. The magnetic induction intensity of the magnetic separation 1 is 5000-5500 mT, the magnetic induction intensity of the magnetic separation 2 is 4300-5000 mT, the magnetic induction intensity of the magnetic separation 3 is 3800-4200 mT, the magnetic induction intensity of the magnetic separation 4 is 3600-4000 mT, the magnetic induction intensity of the magnetic separation 5 is 3200-3600 mT, and the magnetic induction intensity of the magnetic separations 6, 7, 8 and 9 are all 4500-5000 mT.

5. The method for comprehensive recycling of nickel ore rough stone according to claim 1, characterized in that: The concentrate 1 includes magnetic copper-nickel sulfide, the tailings 1 includes non-magnetic ore and copper-nickel sulfide ore, the concentrate 2 and the concentrate 3 are both copper-nickel sulfide nickel ores containing 1.0% to 1.5% nickel, the concentrate 5 is a copper-nickel sulfide nickel ore containing 0.5% to 0.8% nickel, the stone purification rate of the concentrate 6 is 97%, the concentrate 7, the concentrate 8, the concentrate 11, and the concentrate 12 are copper-nickel sulfide nickel ores containing 0.3% to 0.6% nickel, and the sand purification rates of the concentrates 9 and 13 are both 99.6%.

6. The method for comprehensive recycling of nickel ore rough stone according to claim 1, characterized in that: In step 5, when an air separator is selected for purification and impurity removal, the wind pressure of the air separator is controlled at 3.5-5.0 KPa; when a jig is selected for purification and impurity removal, the angle of the material dividing baffle a of the jig is 142°, the sieve plate stroke is 30 mm, and the sieve plate stroke frequency is 310 times / min.

7. The method for comprehensive recycling of nickel ore rough stone according to claim 1, characterized in that: In step 5 and step 6, the water washing and purification includes: sending the corresponding tailings into the water washing and purification device, controlling the liquid-solid ratio at 7:1 and the screw speed at 40r / min for purification and separation.

8. The method for comprehensive recycling of nickel ore rough stone according to claim 1, characterized in that: include: The coarse sand product and the fine sand product are subjected to sand classification to obtain mine filling sand with a particle size of +3.7mm, construction coarse sand of +3.1 to -3.7mm, construction medium sand of +2.3 to -3.0mm, and construction fine sand products of +1.6 to -2.2mm; the stone product is subjected to stone classification to obtain crushed stone with a particle size of -15mm and sand and gravel aggregate of +15mm.

9. The method for comprehensive recycling of nickel ore rough stone according to claim 1, characterized in that: include: When sand and gravel are needed to backfill the middle section of the mine, the stone product, coarse sand product, fine sand product and the pebbles product are mixed and used as mine filling sand.

10. The method for comprehensive recycling of nickel ore rough stone according to claim 1, characterized in that: The sieved product with a particle size of -8 mm and the fine mud product in step 4 are combined and then fine sand and soil are classified to obtain concentrate 14 and tailings 14. The concentrate 14 is organically treated to prepare soil for land reclamation and greening, and the tailings 14 are used as general building materials.

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