Pre-grinding ore washing, pre-selecting and recycling system for high-mud-content magnetite

Abstract

The system is formed by combining and connecting a coarse crusher (1), an ore washing sieve (2), a large dry magnetic separator (3), a wet magnetic separation preselector (4), a fine crusher (5), a dry magnetic separation scavenging machine (6), an aggregate screening machine (7), a preselected concentrate dewatering sieve (8), a preselected tailing dewatering sieve (9), a preselected concentrate concentration magnetic separator (10) and a preselected concentrate filter (11). An ore discharge port of the coarse crusher (1) is connected with a feeding end at the upper part of the ore washing sieve (2), an oversize discharge port of the ore washing sieve (2) is connected with a feeding belt of the large dry magnetic separator (3), and an undersize discharge port of the ore washing sieve (2) is connected with an ore feed port of the wet magnetic preselector (4). Slurry on the surface of high-silt-content raw ore is washed off through screening and ore washing operation, and the ore blocking condition is reduced; dry separation and wet separation processes are combined, a large number of tailings are thrown out in advance, meanwhile, various building material products are produced, and the resource utilization rate is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnetite ore pre-selection process, and in particular relates to a pre-grinding ore washing pre-selection and comprehensive recovery system for muddy magnetite. Background Art

[0002] my country has rich iron ore resources of various types, among which magnetite is the main type of iron ore in my country, accounting for more than half of the total reserves. Although magnetite is easier to separate than siderite and hematite, a large amount of ore mud is often mixed into the ore during the mining process, which brings certain difficulties to the separation.

[0003] The ore mud contained in magnetite ore is divided into primary ore mud and secondary ore mud. Primary ore mud mainly comes from the weathering or oxidation metamorphism of the ore body, the weathering and mud-forming nature of the surrounding rock, and the easily muddied mica and ferrochlore in the iron ore. This type of primary ore mud has a close relationship with the ore and is therefore difficult to wash. Secondary ore mud mostly comes from external factors, such as the scattered fine rock powder produced during ore blasting, loading and unloading, and transportation, the crushing of the ore body and the development of cracks during underground mining, the ore mud brought by the surface muddy water infiltrating into the ore body through the cracks, and the mixing of surface yellow mud and topsoil in open-pit mining. This type of ore mud has little to do with the genesis of the ore deposit and is generally easier to clean.

[0004] The mined magnetite containing mud is supplied to the beneficiation plant. The presence of ore mud will cause blockage in the crushing, transportation, ore bin unloading and other links, and will also affect the grinding, grading and sorting operations, resulting in unstable production of the beneficiation system. Due to the high mud content and high viscosity, the effect of dry magnetic separation tailings after crushing is not good, and the magnetic iron content in the discarded tailings is high, which affects the recovery rate of magnetic iron in the concentrate. In addition, after dry magnetic separation tailings, the grade entering the mill can be appropriately improved, but it is still difficult to pre-select the ore to the geological grade before entering the mill only through the dry separation process. If the ore mud problem is not handled in the previous process, the tailings concentration well will often run seriously turbid after grinding, which greatly affects the return water quality. On the other hand, considering that most iron ore beneficiation plants currently have insufficient tailings storage capacity or no tailings storage, the amount of tailings entering the storage must be reduced as much as possible in the beneficiation production, that is, the grade of the ore entering the mill must be increased as much as possible, and the amount of ore entering the mill must be reduced to reduce the total amount of tailings.

[0005] Ore washing is an effective means of pre-treating muddy iron ore. Meishan Iron Mine and Baixiangshan Iron Mine have adopted the linear screen ore washing process to solve the impact of sticky ore muds such as kaolin and chlorite in the original ore on the production process, and the process operation effect is good. In the pre-treatment of muddy magnetite, while washing and desludging, it is also necessary to combine dry selection and wet selection processes to discard waste rocks as soon as possible, improve the grade entering the mill, and achieve early disposal. In addition, linear vibrating screens are generally only suitable for desludging processes that are easier to clean. In addition, the resource utilization of discarded tailings needs to be considered. These all require seeking new methods and solutions to solve them. Summary of the invention

[0006] The purpose of the utility model is to provide a pre-grinding ore washing and pre-selection recovery system for high-mud content magnetite with good mud washing effect, high screening efficiency, low tailings discharge and high resource utilization rate, in view of the problems existing in the prior art such as poor adaptability to the pre-selection of high-mud content iron ore, serious clogging, poor sorting effect, low resource utilization and large tailings discharge.

[0007] In order to achieve the above-mentioned purpose of the utility model, the utility model discloses a pre-grinding ore washing and pre-selection recovery system for high-mud magnetite, which is composed of a coarse crusher, an ore washing screen, a large block dry magnetic separator, a wet magnetic pre-selector, a fine crusher, a dry magnetic sweeper, an aggregate screening machine, a pre-selected concentrate dewatering screen, a pre-selected tailings dewatering screen, a pre-selected concentrate concentrating magnetic separator, and a pre-selected concentrate filter.

[0008] The discharge port of the coarse crusher is connected to the upper feeding end of the ore washing screen through a chute, the upper discharge port of the ore washing screen is connected to the feeding belt of the bulk dry magnetic separator through a chute, and the lower discharge port of the ore washing screen is connected to the feeding port of the wet magnetic pre-separator;

[0009] The concentrate discharge port of the bulk dry magnetic separator is connected to the pre-grinding ore bin through a material conveying belt, the tailings discharge port of the bulk dry magnetic separator is connected to the feeding port of the fine crusher through a chute or a material conveying belt, the discharge port of the fine crusher is connected to the feeding belt of the dry magnetic separation sweeping machine through a chute, the concentrate discharge port of the dry magnetic separation sweeping machine is connected to the pre-grinding ore bin through a material conveying belt, and the tailings discharge port of the dry magnetic separation sweeping machine is connected to the feeding port of the aggregate screening machine through a chute or a material conveying belt;

[0010] The tailings discharge port of the wet magnetic pre-separator is connected to the feed port of the pre-separation tailings dewatering screen through a chute, and the under-screen discharge port of the pre-separation tailings dewatering screen is connected to the tailings sand selection system composed of a hydrocyclone-linear dewatering screen;

[0011] The concentrate discharge port of the wet magnetic separation pre-selection machine is connected to the feed port of the pre-selected concentrate dewatering screen through a pipeline. The oversize discharge port of the pre-selected concentrate dewatering screen is connected to the ore bin before grinding through a material conveying belt. The undersize discharge port of the pre-selected concentrate dewatering screen is connected to the pre-selected concentrate thickening magnetic separator and the pre-selected concentrate filter through pipelines in sequence.

[0012] Preferably, the underflow port of the pre-selected concentrate thickening magnetic separator is connected to the tailings sand selection system composed of a hydrocyclone and a straight dewatering screen.

[0013] Preferably, the ore washing screen adopts a double-layer banana screen. The upper screen hole size is 20 - 50 mm, and the lower screen hole size is 8 - 12 mm. Both the upper and lower screen meshes are equipped with flushing water pipes.

[0014] Preferably, the large-piece dry magnetic separator adopts a magnetic drum, and the drum is used as the head pulley of the belt.

[0015] Preferably, the fine crusher adopts a fine crushing type jaw crusher, and the discharge port range is 30 - 50 mm.

[0016] Preferably, the dry magnetic separation scavenging machine adopts a magnetic drum, and the drum is used as the head pulley of the belt; the aggregate screening machine adopts a double-layer reciprocating linear vibrating inertial screen, and the installation inclination angle of the double-layer reciprocating linear vibrating inertial screen is 5 - 10°.

[0017] Preferably, the wet magnetic separation pre-selection machine adopts an external magnetic type cylindrical magnetic separator, and the inclination angle adjustment range is 0 - 10°.

[0018] Preferably, the pre-selected concentrate dewatering screen adopts a straight dewatering screen with a screen hole size of 1 mm. The pre-selected concentrate thickening magnetic separator adopts a wet permanent magnetic cylindrical magnetic separator, and the pre-selected concentrate filter adopts a permanent magnetic external filter cylinder type vacuum filter.

[0019] Preferably, the pre-selected tailings dewatering screen adopts a straight dewatering screen with a screen hole size of 3 mm.

[0020] The present utility model is implemented in industrial applications according to the following steps:

[0021] 1) Feed the raw ore after coarse crushing by the coarse crusher into the ore washing screen for screening and ore washing operations, wash away the surface ore mud, and obtain oversize ore and undersize pulp materials respectively;

[0022] 2) Feed the oversize ore obtained in step 1) into the large-piece dry magnetic separator for large-piece dry separation, discharge the large-piece dry separation waste rock, and obtain the large-piece dry separation concentrate. The large-piece dry separation concentrate is returned to the ore bin before grinding;

[0023] 3) Feed the large-sized dry-selection waste rocks discharged in step 2) into a fine crusher for fine crushing. The finely crushed waste rocks obtained are subjected to dry magnetic separation scavenging. The scavenging concentrate obtained is returned to the ore bin before grinding, and the waste rocks thrown out by scavenging are fed into an aggregate screening machine (double-deck or triple-deck vibrating screen) and screened into 3 or 4 different particle-size aggregate products respectively. The screen hole size is flexibly adjusted according to market demands.

[0024] 4) Feed the undersize pulp material obtained in step 1) into a wet magnetic separation pre-selection machine for wet magnetic separation pre-selection to obtain wet magnetic separation pre-selection concentrate and wet magnetic separation pre-selection tailings respectively.

[0025] 5) After dehydrating the wet magnetic separation pre-selection concentrate obtained in step 4) through a pre-selection concentrate dewatering screen (linear dewatering screen), the oversize material is sent to the ore bin before grinding, and the undersize material is fed into a pre-selection concentrate thickening magnetic separator and a pre-selection concentrate filter. After thickening magnetic separation and filter dehydration, it is returned to the ore bin before grinding, and the thickening magnetic separation tailings are discharged.

[0026] 6) Dehydrate the wet magnetic separation pre-selection tailings obtained in step 4) through a pre-selection tailings dewatering screen (linear dewatering screen). The oversize material is sold as rice stone products externally, and the undersize material is merged with the thickening magnetic separation tailings obtained in step 5) and then pumped into a hydrocyclone-linear dewatering screen for action to separate building sand and gravel products. The fine-grained tailings thrown out are fed into a tailings treatment system for treatment.

[0027] The utility model flushes the slime on the surface of the high-slime raw ore through screening and washing operations, reducing the ore blockage situation; the combination of dry separation and wet separation processes pre-throws a large amount of tailings, reducing the grinding feed volume and increasing the grinding feed grade; at the same time, it produces multiple rice stone and sand and gravel products, improving the comprehensive utilization rate of resources, and is particularly suitable for the pre-washing and pre-selection comprehensive recovery of magnetite with high slime content and high viscosity, where the iron grade in the raw ore is 20.0 - 35.0% and the -74μm proportion is ≥10%.

[0028] Compared with the prior art, the pre-washing and pre-selection recovery system for high-slime magnetite of the utility model has the following beneficial effects:

[0029] (1) The screening and washing operation of the utility model uses a double-deck banana screen for washing and desliming. The double-deck screen surface banana screen adopts a continuous multi-angle screen surface design, generally with an angle design of 5 - 25°, which can make the material move and stratify quickly, increasing the screening probability of near-gap particles and improving the washing and screening efficiency. The technology is advanced, the operation is reliable, and the washing and desliming effect is good.

[0030] (2) In view of the characteristics of the slime content of the magnetite to be selected, the utility model comprehensively uses dry separation to discard waste and wet pre-selection before grinding, which can discard more than 30% of the tailings, greatly reducing the grinding ore volume, increasing the grinding feed grade, and reducing the operation cost of the subsequent grinding and separation process.

[0031] (3) The wet magnetic separation pre-selection machine adopts an external magnetic cylinder type magnetic separator, which is different from the structural principle of the conventional cylinder type magnetic separator. For the external magnetic cylinder type magnetic separator, the magnetic system is located outside the separation cylinder, and the materials are separated inside the separation cylinder body. The separation zone is relatively long, the pulp flows along the axial direction of the separation cylinder, and the separated minerals are rotated with the cylinder to obtain multiple scavenging operations, realizing the pre-selection of coarse particles of weakly magnetic minerals, and ensuring a relatively high separation efficiency and ore dressing recovery rate.

[0032] (4) The waste rocks thrown out by dry separation are screened into aggregate products of different particle sizes through fine crushing and scavenging, and then passed through an inertial vibrating screen. The main components of the inertial vibrating screen are the screen frame and the inertial vibrator. The exciting force generated by the eccentric rotation of the vibrator is transmitted to the screen box to excite the vibration of the screen. The amplitude of the inertial vibrating screen is not large, but the frequency is relatively high. It is a screening device with relatively high productivity and screening efficiency, simple operation, convenient installation, and low energy consumption, and is especially suitable for the aggregate screening operation of pre-thrown waste rocks.

[0033] (5) The waste rocks thrown out by dry separation tailing are screened into aggregate products of different particle sizes, and the tailings thrown out by wet pre-selection are processed through a hydrocyclone classification and screening dehydration process to obtain different specifications of building sand and gravel. The waste rocks thrown out by dry and wet pre-selection of magnetite containing mud are recycled. While reducing solid waste, it not only greatly improves the resource recovery rate, but also significantly enhances the economic benefits of ore dressing.

[0034] (6) The present utility model pre-treats and recovers the magnetite containing mud before grinding through processes such as ore washing and de-sludging, comprehensive application of dry separation and wet separation, and resource utilization of thrown waste rocks, reducing the grinding feed amount, increasing the grinding feed grade, and reducing the grinding and separation operation cost. By pre-selecting and treating the magnetite containing mud through ore washing, iron ore with a relatively high grade for grinding and building sand and gravel products are obtained, realizing the comprehensive development and utilization of the magnetite containing mud resources. Description of the Drawings

[0035] Figure 1 It is the equipment connection diagram of a pre-grinding ore washing and pre-selection recovery system for high-mud-content magnetite of the present utility model.

[0036] The reference numerals are: 1 - coarse crusher; 2 - ore washing screen; 3 - large-piece dry magnetic separator; 4 - wet magnetic separation pre-selection machine; 5 - fine crusher; 6 - dry magnetic separation scavenging machine; 7 - aggregate screening machine; 8 - pre-selection concentrate dewatering screen; 9 - pre-selection tailing dewatering screen; 10 - pre-selection concentrate thickening magnetic separator; 11 - pre-selection concentrate filter. Detailed Embodiments

[0037] To further describe the present utility model, the following further details the pre-grinding ore washing and pre-selection recovery system for high-mud-content magnetite of the present utility model in conjunction with the drawings and embodiments. However, the present utility model is not limited to the embodiments.

[0038] In the example, the selected magnetite is the magnetite ore from a mining company in Anhui. It has a low TFe grade, high mud content, and a moisture content of 7.28%. The results of the chemical multi-element analysis of the raw ore are shown in Table 1.

[0039] Table 1 Results of Chemical Multi-Element Analysis of Raw Ore (%)

[0040] Component TFe MnO <![CDATA[SiO2]]> <![CDATA[Al2O3]]> CaO MgO S P <![CDATA[TiO2]]> Content 27.33 0.110 28.70 0.40 7.82 3.1 6.14 0.026 0.168

[0041] After mixing and reducing the selected test ore samples, particle size composition analysis was carried out. The results of the particle size composition analysis of the raw ore are shown in Table 2.

[0042] Table 2 Analysis Results of Particle Size Composition of Raw Ore Samples

[0043]

[0044]

[0045] The results in Table 2 show that: the TFe grade of the raw ore is 27.33%. In the raw ore after coarse crushing (particle size 0 - 300 mm), the content of the -0.074 mm particle size fraction accounts for 13.66%, and its particle size grade is 11.46%. The cumulative content of the -1 mm particle size fraction accounts for 23.77%. This raw ore contains a large amount of secondary mud and fine-grained rocks, resulting in serious depletion of the mined raw ore and a very low raw ore grade. The current process flow of the concentrator directly conducts two-stage dry magnetic separation to discard waste after coarse crushing of this ore. Due to the lack of washing operation, affected by the ore mud, the effect of dry separation and waste discarding is not ideal, and the waste discarding yield is only 24.50%. Moreover, the grade of the ore entering the mill is only increased from 27.33% to 36.52%. Blockages often occur during the ore bin feeding and belt transfer processes of the ore, and the production system of the concentrator is not smooth enough.

[0046] From Figure 1 the equipment connection diagram of a pre-washing and pre-selection recovery system for high-mud-content magnetite of the present invention shown, it can be seen that a pre-washing and pre-selection recovery system for high-mud-content magnetite of the present invention is composed of a coarse crusher 1, a washing screen 2, a large-piece dry magnetic separator 3, a wet magnetic pre-selection machine 4, a fine crusher 5, a dry magnetic scavenging separator 6, an aggregate screening machine 7, a pre-selected concentrate dewatering screen 8, a pre-selected tailing dewatering screen 9, a pre-selected concentrate thickening magnetic separator 10, and a pre-selected concentrate filter 11 connected in combination.

[0047] The discharge port of the primary crusher 1 is connected to the upper feeding end of the ore washing screen 2 through a chute. The oversize discharge port of the ore washing screen 2 is connected to the feeding belt of the large-piece dry magnetic separator 3 through a chute. The undersize discharge port of the ore washing screen 2 is connected to the feeding port of the wet magnetic pre-separator 4. The ore washing screen 2 adopts a double-layer banana screen. The upper screen hole size is 20 - 50 mm, and the lower screen hole size is 8 - 12 mm. Both the upper and lower screen meshes are equipped with flushing water pipes. The large-piece dry magnetic separator 3 adopts a magnetic drum with a magnetic field intensity of 0.35 - 0.45 T, and the drum is used as the head pulley of the belt. The fine crusher 5 adopts a fine-crushing type jaw crusher with a discharge port range of 30 - 50 mm. The dry magnetic scavenging separator 6 adopts a magnetic drum with a magnetic field intensity of 0.40 - 0.50 T, and the drum is used as the head pulley of the belt. The aggregate screening machine 7 adopts a double-layer reciprocating linear vibration inertial screen, which screens the incoming waste rock into aggregate products of particle sizes 0 - 5 mm, 5 - 20 mm, and 20 - 30 mm - aggregate 1, aggregate 2, and aggregate 3. The installation inclination angle of the double-layer reciprocating linear vibration inertial screen is 5 - 10°. The wet magnetic pre-separator 4 adopts an external magnetic drum-type magnetic separator with a magnetic field intensity of 0.30 - 0.60 T, an inclination adjustment range of 0 - 10°, and a sorting drum rotation speed range of 0 - 17 rpm. The pre-selected concentrate dewatering screen 8 adopts a linear dewatering screen with a screen hole size of 1 mm. The pre-selected concentrate thickening magnetic separator 10 adopts a wet permanent magnetic drum-type magnetic separator with a magnetic field intensity in the range of 0.30 - 0.40 T, and the concentration of the thickened magnetic separation concentrate is controlled at 40% - 55%. The pre-selected concentrate filter 11 adopts a permanent magnetic external filter drum-type vacuum filter with a cylinder rotation speed of 0.5 - 2 r / min, and the water content of the filter cake is controlled at 8 - 10%. The pre-selected tailings dewatering screen 9 adopts a linear dewatering screen with a screen hole size of 3 mm.

[0048] The concentrate discharge port of the large-piece dry magnetic separator 3 is connected to the ore bin before grinding through a material conveying belt. The tailings discharge port of the large-piece dry magnetic separator 3 is connected to the feeding port of the fine crusher 5 through a chute or a material conveying belt. The discharge port of the fine crusher 5 is connected to the feeding belt of the dry magnetic scavenging separator 6 through a chute. The concentrate discharge port of the dry magnetic scavenging separator 6 is connected to the ore bin before grinding through a material conveying belt. The tailings discharge port of the dry magnetic scavenging separator 6 is connected to the feeding port of the aggregate screening machine 7 through a chute or a material conveying belt.

[0049] The tailings discharge port of the wet magnetic pre-separator 4 is connected to the feeding port of the pre-selected tailings dewatering screen 9 through a chute. The undersize discharge port of the pre-selected tailings dewatering screen 9 is connected to the tailings sand selection system composed of a hydrocyclone - linear dewatering screen.

[0050] The concentrate discharge port of the wet magnetic separation preselector 4 is connected to the feed port of the preselected concentrate dewatering screen 8 through a pipeline. The oversize discharge port of the preselected concentrate dewatering screen 8 is connected to the ore bin before grinding through a material conveying belt. The undersize discharge port of the preselected concentrate dewatering screen 8 is connected to the preselected concentrate thickening magnetic separator 10 and the preselected concentrate filter 11 through pipelines in sequence. The underflow port of the preselected concentrate thickening magnetic separator 10 is connected to the tailings sand selection system composed of a hydrocyclone and a straight dewatering screen.

[0051] In order to remove the surrounding rock and secondary mud mixed in the mining process and restore the geological grade of the ore, the pre-washing and preselection process before grinding of the present utility model is adopted. First, the raw ore needs to be washed to wash away a large amount of secondary mud, and then the raw ore is subjected to dry tailing discarding and wet preselection tailing discarding after washing.

[0052] In the actual industrial application of the pre-washing and preselection recovery system for high-slime magnetite of the present utility model, it specifically includes the following processes and step implementations:

[0053] 1) Feed the 0 - 300 mm raw ore after coarse crushing by the coarse crusher 1 into the washing screen 2 (double-layer banana screen) for screening and washing operations to wash away the surface ore mud, and obtain oversize ore and undersize pulp material (i.e., surface ore mud material) respectively; the upper screen hole size of the double-layer banana screen is 30 mm, and the lower screen hole size is 12 mm. Both the upper and lower screen meshes need to be equipped with flushing water pipes.

[0054] 2) Feed the oversize ore obtained in step 1) into the large-piece dry magnetic separator 3 for large-piece dry separation, discharge the large-piece dry separation waste rock, and obtain the large-piece dry separation concentrate. The large-piece dry separation concentrate is returned to the ore bin before grinding; the large-piece dry magnetic separator 3 uses a magnetic drum, and the magnetic field intensity of the magnetic drum is 0.4 T.

[0055] 3) Feed the large-piece dry separation waste rock discharged in step 2) into the fine crusher 5 for fine crushing. The fine crusher 5 selects a fine-crushing type jaw crusher, and the discharge port size is 30 mm. The finely crushed waste rock obtained is fed into the dry magnetic separation scavenger 6 for dry magnetic separation scavenging. The dry magnetic separation scavenger 6 uses a magnetic drum, and the magnetic field intensity is 0.45 T. The scavenging concentrate obtained is returned to the ore bin before grinding, and the waste rock scavenged and thrown out is fed into the aggregate screening machine 7 (double-layer reciprocating linear vibrating inertial screen) to be screened into three different particle size aggregate products of 0 - 5 mm, 5 - 20 mm, and 20 - 30 mm - aggregate 1, aggregate 2, and aggregate 3.

[0056] 4) Feed the undersize pulp material obtained in step 1) into the wet magnetic separation preselector 4 for wet magnetic separation preselection operations to obtain wet magnetic separation preselection concentrate and wet magnetic separation preselection tailings respectively; the wet magnetic separation preselector 4 uses an external magnetic type cylindrical magnetic separator, and the magnetic field intensity is 0.45 T.

[0057] 5) After dehydrating the wet magnetic separation pre-concentrate obtained in step 4) by the pre-concentrate dewatering screen 8 with a screen hole size of 1 mm, the oversize material is sent to the ore bin before grinding, and the undersize material is concentrated and magnetically separated by the pre-concentrate concentrating magnetic separator 10 with a magnetic field intensity of 0.4 T, and after being filtered by the pre-concentrate filter 11 (external filter cylinder type vacuum filter), it is returned to the ore bin before grinding, and the concentrated magnetic separation tailings are discharged.

[0058] 6) Dehydrate the wet magnetic separation pre-tailings obtained in step 4) by the pre-tailings dewatering screen 9 (linear dewatering screen). The 3-12 mm oversize material is sold as rice stone products, and the -3 mm undersize material is combined with the concentrated magnetic separation tailings obtained in step 5) and then pumped into a hydrocyclone - linear dewatering screen for separation to obtain construction sand and gravel products with a particle size of 0-3 mm; the fine-grained tailings thrown out are fed into the tailings treatment system for treatment.

[0059] After washing and pre-selecting the muddy magnetite according to the above process and steps, the main product - iron rough concentrate with a TFe grade of 46.20% is obtained. At the same time, the thrown tailings are processed to obtain by-product 1 - rice stone (3-12 mm), by-product 2 - sand and gravel (0-3 mm), and by-product 3 - aggregate products with different particle sizes (0-5 mm, 5-20 mm, 20-30 mm).

[0060] Calculated based on the processing of 1 million tons of raw ore per year in the concentrator, more than 150,000 tons of rice stone and sand and gravel, as well as 230,000 tons of aggregate products can be obtained annually and sold as building materials, increasing the enterprise's benefits by more than 10 million yuan annually, realizing the resource utilization of tailings. Through the washing and pre-selection process, the pre-thrown waste rate is increased from 24.5% to 45.14%, greatly reducing the amount of ore entering the grinding, improving the grinding grade of the ore, and reducing the grinding and separation operation cost by more than 5 yuan / t. The economic benefits of the solution of the present utility model are significant, achieving the effect of energy conservation and consumption reduction, and at the same time improving the comprehensive utilization rate of resources.

[0061] The above are only the preferred embodiments in the actual use of the present utility model, but the protection scope of the method of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the method of the present utility model should be subject to the protection scope defined by the claims.

Claims

1. A pre-grinding ore washing and pre-selection recovery system for high-mud magnetite, characterized in that It is composed of a coarse crusher (1), a ore washing screen (2), a large block dry magnetic separator (3), a wet magnetic pre-separator (4), a fine crusher (5), a dry magnetic sweeper (6), an aggregate screening machine (7), a pre-selected concentrate dewatering screen (8), a pre-selected tailings dewatering screen (9), a pre-selected concentrate thickening magnetic separator (10), and a pre-selected concentrate filter (11). The discharge port of the coarse crusher (1) is connected to the upper feeding end of the ore washing screen (2) through a chute, the upper discharge port of the ore washing screen (2) is connected to the feeding belt of the bulk dry magnetic separator (3) through a chute, and the lower discharge port of the ore washing screen (2) is connected to the feeding port of the wet magnetic pre-separator (4); The concentrate discharge port of the bulk dry magnetic separator (3) is connected to the pre-grinding ore bin through a material conveying belt, the tailings discharge port of the bulk dry magnetic separator (3) is connected to the feeding port of the fine crusher (5) through a chute or a material conveying belt, the discharge port of the fine crusher (5) is connected to the feeding belt of the dry magnetic separation sweeping machine (6) through a chute, the concentrate discharge port of the dry magnetic separation sweeping machine (6) is connected to the pre-grinding ore bin through a material conveying belt, and the tailings discharge port of the dry magnetic separation sweeping machine (6) is connected to the feeding port of the aggregate screening machine (7) through a chute or a material conveying belt; The tailings discharge port of the wet magnetic pre-selector (4) is connected to the feed port of the pre-selected tailings dewatering screen (9) through a chute, and the under-screen discharge port of the pre-selected tailings dewatering screen (9) is connected to the tailings sand selection system composed of a hydrocyclone-linear dewatering screen; The concentrate discharge port of the wet magnetic pre-selector (4) is connected to the feed port of the pre-selected concentrate dewatering screen (8) through a pipeline, the screen-surface material discharge port of the pre-selected concentrate dewatering screen (8) is connected to the pre-grinding ore bin through a material conveying belt, and the screen-under material discharge port of the pre-selected concentrate dewatering screen (8) is connected to the pre-selected concentrate concentrating magnetic separator (10) and the pre-selected concentrate filter (11) through a pipeline.

2. A pre-grinding ore washing and pre-selection recovery system for high-mud content magnetite according to claim 1, characterized in that: The bottom flow port of the pre-selected concentrate concentrating magnetic separator (10) is connected to a tailings sand selection system consisting of a hydrocyclone-linear dewatering screen.

3. A pre-grinding ore washing and pre-selection recovery system for high-mud content magnetite as claimed in claim 1, characterized in that: The ore washing screen (2) adopts a double-layer banana screen, the size of the upper screen hole is 20-50 mm, the size of the lower screen hole is 8-12 mm, and the upper and lower screens are both equipped with flushing water pipes.

4. A pre-grinding ore washing and pre-selection recovery system for high-mud content magnetite as claimed in claim 1, characterized in that: The bulk dry magnetic separator (3) adopts a magnetic drum, and the drum is used as a belt head pulley.

5. A pre-grinding ore washing and pre-selection recovery system for high-mud content magnetite as claimed in claim 1, characterized in that: The fine crusher (5) is a fine crushing jaw crusher, and the discharge opening range is 30 to 50 mm.

6. A pre-grinding ore washing and pre-selection recovery system for high-mud content magnetite as claimed in claim 1, characterized in that: The dry magnetic separator (6) adopts a magnetic drum, which is used as a belt head wheel; the aggregate screening machine (7) adopts a double-layer reciprocating linear vibration inertia screen, and the installation angle of the double-layer reciprocating linear vibration inertia screen is 5-10 degrees.

7. A pre-grinding ore washing and pre-selection recovery system for high-mud content magnetite as claimed in claim 1, characterized in that: The wet magnetic pre-separator (4) adopts an external magnetic drum magnetic separator, and the inclination adjustment range is 0 to 10 degrees.

8. A pre-grinding ore washing and pre-selection recovery system for high-mud content magnetite as claimed in claim 1, characterized in that: The pre-selected concentrate dewatering screen (8) adopts a linear dewatering screen with a screen hole size of 1 mm, the pre-selected concentrate concentrating magnetic separator (10) adopts a wet permanent magnetic drum magnetic separator, and the pre-selected concentrate filter (11) adopts a permanent magnetic outer filter drum vacuum filter.

9. A pre-grinding ore washing and pre-selection recovery system for high-mud content magnetite as claimed in claim 1, characterized in that: The pre-selected tailings dewatering screen (9) is a linear dewatering screen with a screen hole size of 3 mm.

10. A pre-grinding ore washing and pre-selection recovery system for high-mud content magnetite as claimed in claim 2, characterized in that: The ore washing screen (2) adopts a double-layer banana screen, the size of the upper screen hole is 20-50 mm, the size of the lower screen hole is 8-12 mm, and the upper and lower screens are equipped with flushing water pipes; the large block dry magnetic separator (3) adopts a magnetic drum, and the drum is used as a belt head wheel; the fine crusher (5) adopts a fine crushing jaw crusher, and the discharge port range is 30-50 mm; the dry magnetic separation sweeper (6) adopts a magnetic drum, and the drum is used as a belt head wheel; the aggregate screening machine (7) adopts a double-layer reciprocating linear vibration The inertial screen and the double-layer reciprocating linear vibration inertial screen have an installation inclination angle of 5 to 10°; the wet magnetic pre-selector (4) adopts an external magnetic drum magnetic separator, and the inclination adjustment range is 0 to 10°; the pre-selected concentrate dewatering screen (8) adopts a linear dewatering screen, and the screen hole size is 1 mm; the pre-selected concentrate concentration magnetic separator (10) adopts a wet permanent magnetic drum magnetic separator, and the pre-selected concentrate filter (11) adopts a permanent magnetic external filter cartridge vacuum filter; the pre-selected tailings dewatering screen (9) adopts a linear dewatering screen, and the screen hole size is 3 mm.

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