Sorting method of low-grade manganese oxide ore

Abstract

The invention discloses a sorting method for low-grade manganese oxide ore, which belongs to the field of mineral separation and comprises the following steps: step 1, separately stacking a first type of raw ore sorted by an ore color sorter and a second type of raw ore sorted by a jigger, and respectively sorting the first type of raw ore and the second type of raw ore; step 2, performing crushing, ore washing and screening treatment on the first and second types of raw ores to obtain powdery manganese concentrate and first and second types of lump ores; 3, the first type of lump ore and the second type of lump ore are conveyed to a first stock bin and a second stock bin through different belt conveyors respectively; 4, the first kind of lump ore is fed into a color sorter, manganese and gangue are separated according to the color difference, and blocky manganese concentrate and blocky tailings are obtained; 5, the second-class lump ore is fed into a jigger, manganese and gangue are separated according to the density difference, and blocky manganese concentrate and blocky tailings are obtained; 6, the blocky manganese concentrates obtained in the step 4 and the step 5 are combined into final manganese concentrates; and 7, combining the blocky tailings obtained in the step 4 and the step 5 into final tailings. The method is simple in process, high in concentrate grade and recovery rate and high in efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of manganese ore dressing, and in particular to a method for separating low-grade manganese oxide ore. Background Art

[0004] Chinese patent application 201010300557.9 discloses a method for beneficiating low-grade manganese ore, which adopts a coarse-grained grading, coarse-grained magnetic separation and fine-grained flotation recovery process, combined with concentrated strong stirring measures, and adopts a reasonable reagent system, and can step by step obtain manganese magnetic concentrate with a grade of 26% and manganese flotation concentrate with a grade of 18%, thereby achieving a comprehensive recovery rate of 8% low-grade manganese carbonate ore of more than 80%.

[0005] Chinese patent application 201810757510.1 discloses a process for sorting weathered low-grade refractory manganese ore. First, fine particles in the original ore are removed, and the particle size of the ore to be selected is controlled by pre-screening. The ore is pre-sorted by a photoelectric scrap machine to pre-enrich the concentrate and reduce the processing volume of subsequent processes. The crushing process is used instead of the ball milling process of the traditional process, which can minimize the processing capacity of the jigging and shaking table to save energy and reduce production costs.

[0006] Chinese patent application 201810098653.6 discloses a method for beneficiating manganese ore, which includes firstly using a rod mill to grind the manganese carbonate ore to a relatively uniform particle size, and then using a cyclone to separate the coarse and fine particle slurry. The coarse particle slurry is ball milled in a ball mill, and the fine particle slurry is desludified by a slag screen to avoid the reduction of separation efficiency due to the presence of mud during magnetic separation. The slurry is further desludified by a weak magnetic separation system and a strong magnetic separation system to finally obtain a fine particle manganese concentrate.

[0007] The above prior art has at least the following disadvantages:

[0008] (1) The prior art mainly focuses on the separation method of manganese carbonate ore, and rarely involves the separation method of manganese oxide ore, which is different from the properties of manganese ore involved in this patent.

[0009] (2) During the flotation of manganese ore, the ore needs to be ground before it can be sorted. It is impossible to obtain bulk manganese concentrate. The obtained powdered manganese concentrate is less valuable than the bulk manganese concentrate. The reduced economic value limits the scope of application of flotation. The flotation of manganese carbonate ore is currently limited to laboratory research. This method has the disadvantages of complex process flow, poor process adaptability, and high production cost. In fact, it has not been applied in industrial production. Some manganese ore dressing plants that use flotation technology have also switched to other methods, such as gravity separation and magnetic separation. The dressing agents in the flotation process often cause pollution problems to the surrounding environment.

[0010] (3) For iron-containing manganese oxide ore, the magnetic separation method cannot separate manganese and iron, resulting in excessive iron impurities in the manganese concentrate, reduced quality of the manganese concentrate, and even possible unsalability.

[0011] (4) The photoelectric tailings discarding, jigging and shaking table processes require two stages of pre-photoelectric tailings discarding, three stages of crushing including coarse crushing, fine crushing and ultra-fine crushing, multiple stages of screening and grading, and sorting into several particle sizes. The tailings need to be concentrated, and the process flow is very complicated.

[0012] (5) Manganese ore often contains a large amount of very low-grade ore mud, which needs to be washed and desludified in advance. In the existing patented technology, desludging is performed after grinding, and no pre-desludging operation is performed. Grinding produces secondary ore mud, which increases manganese loss. In addition, desludging is performed by using a slag screen plus weak magnetic separation and strong magnetic separation, which makes the process complicated.

[0013] (6) There are many types of manganese ores. Even the manganese ores from the same mine may be of various types. If only one separation method is used, there will be problems with poor process adaptability.

[0014] In view of this, the present invention is proposed. Summary of the invention

[0015] The purpose of the present invention is to provide a method for separating low-grade manganese oxide ore, which has a simple process flow, low production cost, strong process adaptability, and high concentrate value, thereby solving the above-mentioned technical problems existing in the prior art.

[0016] The objective of the present invention is achieved through the following technical solutions:

[0017] A method for separating low-grade manganese oxide ore, comprising:

[0018] Step 1: According to the color difference between manganese and gangue, the red and brown low-grade manganese oxide ore are piled together as the first type of ore to be subsequently sorted by a color sorter; according to the density difference between manganese and gangue, the low-grade manganese oxide ore with a gravity separation selectivity coefficient E≥1.75 is piled together as the second type of ore to be subsequently sorted by a jig; the first type of ore and the second type of ore are separately piled and sorted;

[0019] Step 2, crushing, washing and screening the first type of raw ore and the second type of raw ore respectively to obtain a powdered manganese concentrate and a first type of lump ore corresponding to the first type of raw ore, and to obtain a powdered manganese concentrate and a second type of lump ore corresponding to the second type of raw ore;

[0020] Step 3, the first type of lump ore and the second type of lump ore obtained in step 2 are respectively sent to a first silo and a second silo by different belt conveyors, wherein the first silo is used to store the first type of lump ore as color sorting material, and the second silo is used to store the second type of lump ore as jigging sorting material;

[0021] Step 4, feeding the first type of lump ore in the first silo into a color sorter by a feeder, separating manganese and gangue according to color differences, and obtaining lump manganese concentrate and lump tailings;

[0022] Step 5, feeding the second type of lump ore in the second silo into a jig through a feeder, separating manganese and gangue according to density difference, and obtaining lump manganese concentrate and lump tailings;

[0023] Step 6, combining the bulk manganese concentrates obtained in step 4 and step 5 as the final separated manganese concentrate;

[0024] Step 7, combining the block tailings obtained in step 4 and step 5 together as the tailings after final sorting.

[0025] Compared with the prior art, the separation method of low-grade manganese oxide ore provided by the present invention has the following beneficial effects:

[0026] The crushing is used to replace the grinding in the traditional process, which reduces the amount of secondary ore mud and the metal loss caused by it, and also creates favorable conditions for producing high-value bulk manganese concentrate; the screening process after washing is used to improve the selection grade of the selected ore, which creates favorable conditions for jigging or color sorting, and obtains powdered manganese concentrate; according to the difference in color and density of the ore, a jigging and color sorting combined sorting method that is harmonious with the ore properties is invented to improve the manganese recovery rate; a color sorting method for manganese ore is proposed for the first time; no ore dressing agent is used, and the ore dressing wastewater can be reused after clarification without treatment, which does not pollute the surrounding environment and saves water. The manganese ore dressing method of the present invention can obtain bulk manganese concentrate, with high concentrate grade and recovery rate, improved ore dressing efficiency, simple process flow, convenient operation and management, and suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0028] Figure 1 A flow chart of a method for separating low-grade manganese oxide ore provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in combination with the specific content of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, which does not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0030] First, the terms that may be used in this article are explained as follows:

[0031] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0032] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0033] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0034] Unless otherwise specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0035] When concentration, temperature, pressure, size or other parameters are expressed in the form of a numerical range, the numerical range should be understood to specifically disclose all ranges formed by the pairing of any upper limit, lower limit, and preferred value in the numerical range, regardless of whether the range is explicitly stated; for example, if a numerical range of "2 to 8" is stated, the numerical range should be interpreted as including ranges such as "2 to 7", "2 to 6", "5 to 7", "3 to 4 and 6 to 7", "3 to 5 and 7", "2 and 5 to 7", etc. Unless otherwise specified, the numerical ranges stated herein include both their end values ​​and all integers and fractions within the numerical range.

[0036] The scheme provided by the present invention is described in detail below. The contents not described in detail in the embodiments of the present invention belong to the prior art known to professionals in the field. If the specific conditions are not specified in the embodiments of the present invention, they are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturers are not specified in the reagents or instruments used in the embodiments of the present invention, they are all conventional products that can be purchased commercially.

[0037] like Figure 1 As shown, the embodiment of the present invention provides a method for separating low-grade manganese oxide ore, which is a method for combined jigging and color separation, comprising:

[0038] Step 1: According to the color difference between manganese and gangue, the red and brown low-grade manganese oxide ore are piled together as the first type of ore to be subsequently sorted by a color sorter; according to the density difference between manganese and gangue, the low-grade manganese oxide ore with a gravity separation selectivity coefficient E≥1.75 is piled together as the second type of ore to be subsequently sorted by a jig; the first type of ore and the second type of ore are separately piled and sorted;

[0039] Step 2, crushing, washing and screening the first type of raw ore and the second type of raw ore respectively to obtain a powdered manganese concentrate and a first type of lump ore corresponding to the first type of raw ore, and to obtain a powdered manganese concentrate and a second type of lump ore corresponding to the second type of raw ore;

[0040] Step 3, the first type of lump ore and the second type of lump ore obtained in step 2 are respectively sent to a first silo and a second silo by different belt conveyors, wherein the first silo is used to store the first type of lump ore as color sorting material, and the second silo is used to store the second type of lump ore as jigging sorting material;

[0041] Step 4, feeding the first type of lump ore in the first silo into a color sorter by a feeder, separating manganese and gangue according to color differences, and obtaining lump manganese concentrate and lump tailings;

[0042] Step 5, feeding the second type of lump ore in the second silo into a jig through a feeder, separating manganese and gangue according to density difference, and obtaining lump manganese concentrate and lump tailings;

[0043] Step 6, combining the bulk manganese concentrates obtained in step 4 and step 5 as the final separated manganese concentrate;

[0044] Step 7, combining the block tailings obtained in step 4 and step 5 together as the tailings after final sorting.

[0045] Preferably, in step 2 of the above-mentioned separation method, the first type of raw ore and the second type of raw ore are crushed, washed and screened in the same manner, both including:

[0046] Step 21, feeding the raw ore into a crusher for crushing to obtain crushed ore of a predetermined particle size, wherein the raw ore is the first type of raw ore or the second type of raw ore;

[0047] Step 22, sending the crushed ore obtained in step 21 into a trough-type ore washer for ore washing to obtain ore mud and coarse-grained ore;

[0048] Step 23, transporting the sludge obtained in step 22 to a tailings pond via a tailings pipe;

[0049] Step 24, sending the coarse-grained ore obtained in step 22 to a vibrating screen via a belt conveyor for screening to obtain powdered manganese concentrate and lump ore, when the raw ore in step 21 is the first type of raw ore, the obtained lump ore is the first type of lump ore corresponding to the first type of raw ore, and when the raw ore in step 21 is the second type of raw ore, the obtained lump ore is the second type of lump ore corresponding to the second type of raw ore;

[0050] Step 25: The powdered manganese concentrate obtained in step 24 is directly sold.

[0051] Preferably, in step 21 of the above-mentioned sorting method, the raw ore is fed into a crusher for crushing using one-stage crushing.

[0052] Preferably, in step 21 of the above-mentioned sorting method, a predetermined particle size of the crushed ore is obtained: -40 mm:

[0053] Preferably, in step 4 of the above-mentioned sorting method, before the first type of lump ore in the first silo is fed into the color sorter by a feeder, the first type of lump ore in the first silo is screened by a vibrating screen, and the sieve hole size of the vibrating screen is 8 mm×8 mm.

[0054] Preferably, in step 5 of the above-mentioned sorting method, before the second type of lump ore in the second silo is fed into the jig by a feeder, the second type of lump ore in the second silo is screened by a vibrating screen, and the sieve hole size of the vibrating screen is 8 mm×8 mm.

[0055] In summary, the separation method provided by the embodiment of the present invention adopts one-stage crushing instead of multi-stage crushing and grinding, which greatly reduces the ore mudification, avoids secondary ore mud caused by grinding, and reduces the loss of manganese. Since grinding is not required, high-value block manganese concentrate can be obtained, which has a wide range of applications. The trough-type ore washer is used for washing, which has high washing effect and large processing capacity, and is suitable for washing coarse-grained ores. The combined process of jig and color sorting is adopted to separate and sort according to the difference in ore properties. Ores with large color difference are suitable for color sorting, and ores with large density difference are suitable for jig sorting. It can be suitable for changes in ore properties, with a simple process flow and low production cost. Physical methods are used for sorting, without using any reagents, and there is no pollution to the surrounding environment. The color sorting method is used to separate manganese and iron, which reduces the iron content in manganese concentrate and improves the quality of the concentrate. The coarse-grained ore is sorted by jig, and the tailings do not need to be concentrated, and the process flow is simple.

[0056] The technical solutions in the embodiments of the present invention are described clearly and completely below. The described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention.

[0057] Example 1

[0058] like Figure 1 As shown, this embodiment provides a method for separating low-grade manganese oxide ore, which is a method for combining jigging and color separation, and comprises the following steps:

[0059] Step 1, the raw ores with large differences in manganese and gangue color, i.e., red and brown low-grade manganese oxide ores, are piled together as the first type of raw ores, and the raw ores with large differences in manganese and gangue density, i.e., low-grade manganese oxide ores with a gravity separation selectivity coefficient E≥1.75, are piled together as the second type of raw ores, and the two are stored separately and sorted separately;

[0060] Step 2, crushing, washing and screening the first type of raw ore and the second type of raw ore respectively to obtain a powdered manganese concentrate and a first type of lump ore corresponding to the first type of raw ore, and to obtain a powdered manganese concentrate and a second type of lump ore corresponding to the second type of raw ore;

[0061] Specifically, in step 2, the first type of raw ore and the second type of raw ore are crushed, washed and screened in the same manner, and are both carried out according to the following steps, including:

[0062] Step 21, feeding the raw ore into a crusher for crushing, so that the crushed product reaches a suitable particle size, and the raw ore is the first type of raw ore or the second type of raw ore;

[0063] Step 22, sending the crushed product obtained in step 21 into a trough-type ore washer for ore washing to obtain ore mud and coarse-grained ore;

[0064] Step 23, transporting the sludge obtained in step 22 to a tailings pond via a tailings pipe;

[0065] Step 24, sending the coarse-grained ore obtained in step 22 to a vibrating screen via a belt conveyor for screening to obtain powdered concentrate and lump ore, the lump ore obtained from the first type of raw ore and the second type of raw ore are the first type of lump ore and the second type of lump ore respectively, and the obtained powdered concentrate is the same;

[0066] Step 25: The powdered manganese concentrate obtained in step 24 can be sold directly.

[0067] Step 3, using different belt conveyors, the lump ore obtained in step 2 is separately sent to a first silo and a second silo, wherein the first silo is used to store the first type of lump ore as the color sorting material, and the second silo is used to store the second type of lump ore as the jigging sorting material;

[0068] Step 4, feeding the first type of lump ore in the first type of silo into a color sorter by a feeder, and separating manganese and gangue according to color differences to obtain lump manganese concentrate and lump tailings;

[0069] Step 5, feeding the second type of lump ore in the second type silo into a jig through a feeder, separating manganese and gangue according to density difference, and obtaining lump manganese concentrate and lump tailings;

[0070] Step 6, combining the bulk manganese concentrates obtained in step 4 and step 5 to form the final manganese concentrate;

[0071] Step 7, combining the block tailings obtained in step 4 and step 5 together as the final tailings.

[0072] Example 2

[0073] Taking manganese ore from a certain place in West African countries as an example, the raw ore contains 15% to 20% manganese and 3% to 5% iron. Manganese is mainly in the form of pyrolusite, and iron is mainly in the form of hematite and limonite. The particle size of manganese ore is relatively coarse. The manganese ore dressing process of the present invention comprises the following steps:

[0074] Step 1, stacking red and brown low-grade manganese oxide ore with large differences in manganese and gangue color together as the first type of ore, stacking low-grade manganese oxide ore with large differences in manganese and gangue density (i.e., low-grade manganese oxide ore with a gravity separation selectivity coefficient E≥1.75) together as the second type of ore, and storing and sorting them separately;

[0075] Step 2, crushing, washing and screening the first type of raw ore and the second type of raw ore respectively to obtain a powdered manganese concentrate and a first type of lump ore corresponding to the first type of raw ore, and to obtain a powdered manganese concentrate and a second type of lump ore corresponding to the second type of raw ore;

[0076] Specifically, in step 2, the first type of raw ore and the second type of raw ore are crushed, washed and screened in the same manner, and are both carried out according to the following steps, including:

[0077] Step 21, transporting the raw ore to a jaw crusher by a loader for crushing, wherein the crushed product reaches -40 mm, and the raw ore is the first type raw ore or the second type raw ore;

[0078] Step 22, sending the crushed product obtained in step 21 into a trough ore washer for washing to obtain ore mud, the particle size of which is -0.074 mm, accounting for more than 90%, and coarse ore, the particle size of which is -40 mm + 0.074 mm;

[0079] Step 23, transporting the sludge obtained in step 22 to the tailings pond through the tailings pipe, allowing it to settle naturally in the tailings pond, and returning the clarified water to the ore washing and jigging separation process;

[0080] Step 24, the coarse-grained ore obtained in step 22 is subjected to 1 # The B800 belt conveyor feeds the double-layer vibrating screen for screening. The upper screen hole size is 25mm×25mm, and the lower screen hole size is 8mm×8mm, and powdered concentrate and lump ore are obtained;

[0081] Step 25: The powdered manganese concentrate obtained in step 24 has a particle size of -8 mm and a grade of 28% to 30%, and can be sold directly;

[0082] Step 3, use 2 # The B800 belt conveyor conveys the first type of lump ore with large color difference obtained in step 24 to the first type of silo above the color sorter;

[0083] Adoption 3 # The belt conveyor B800 conveys the second type of lump ore with large density difference obtained in step 24 to the second type of silo above the jig;

[0084] Step 4, feeding the first type of lump ore in the first type of silo into two color sorters (i.e., ore color sorters) by using an electric vibrating feeder, and separating the red ore and the brown ore in the ore according to color, so as to separate manganese from gangue, and obtain lump manganese concentrate and lump tailings;

[0085] Step 5, feeding the second type of lump ore in the second type silo into four jigs by an electric vibrating feeder, and the ore is stratified in the trough of the jig according to the density difference, the material with low density is in the upper layer and enters the tailings with the water flow, and the material with high density is in the lower layer and is discharged from the concentrate port under the action of gravity, thereby achieving the separation of manganese and gangue, and obtaining massive manganese concentrate and massive tailings;

[0086] Step 6, combining the lump color separation concentrate obtained in step 4 and the lump jigging concentrate obtained in step 5 as the final manganese concentrate with a manganese grade of not less than 34% to 36%, and loading and transporting them to the port for sale;

[0087] Step 7, combining the bulk color sorting tailings obtained in step 4 and the bulk jigging tailings obtained in step 5 together as the final tailings, and transporting them to the tailings pond by a loader.

[0088] Example 3

[0089] Taking manganese ore from a certain place in Indonesia as an example, the raw ore contains 10% to 25% manganese and 2% to 8% iron. Manganese is mainly in the form of pyrolusite, and iron is mainly in the form of hematite. The manganese ore particle size is relatively coarse. The manganese ore dressing process of the present invention comprises the following steps:

[0090] Step 1, stacking red and brown low-grade manganese oxide ore with large differences in manganese and gangue color together as the first type of ore, stacking low-grade manganese oxide ore with large differences in manganese and gangue density (i.e., low-grade manganese oxide ore with a gravity separation selectivity coefficient E≥1.75) together as the second type of ore, and storing and sorting them separately;

[0091] Step 2, crushing, washing and screening the first type of raw ore and the second type of raw ore respectively to obtain a powdered manganese concentrate and a first type of lump ore corresponding to the first type of raw ore, and to obtain a powdered manganese concentrate and a second type of lump ore corresponding to the second type of raw ore;

[0092] Specifically, in step 2, the first type of raw ore and the second type of raw ore are crushed, washed and screened in the same manner, and are both carried out according to the following steps, including:

[0093] Step 21, the raw ore is sent to a jaw crusher for crushing, the crushed product reaches -40mm, and the raw ore is the first type of raw ore or the second type of raw ore;

[0094] Step 22, sending the crushed product obtained in step 21 into a trough ore washer for washing to obtain ore mud, the particle size of which is -0.074 mm, accounting for more than 80%, and coarse ore, the particle size of which is -40 mm + 0.074 mm;

[0095] Step 23, directly discarding the sludge obtained in step 22 as tailings;

[0096] Step 24, sieving the coarse-grained ore obtained in step 22 using a standard sieve to obtain a powdered concentrate with a particle size of -8 mm and a lump ore with a particle size of +8 mm;

[0097] Step 25: The powdered manganese concentrate obtained in step 24 has a particle size of -8 mm and a grade of 26% to 30%, and can be sold directly;

[0098] Step 3, using a conveyor to convey the first type of lump ore with large color difference obtained in step 24 to the first type silo above the color sorter;

[0099] The second type of lump ore with large density difference obtained in step 24 is conveyed to the second type of silo above the jig by a conveyor;

[0100] Step 4, feeding the first type of lump ore in the first type of silo into three color sorters (i.e., ore color sorters) by using an electric vibrating feeder, and separating the red ore and the brown ore in the ore according to color, so as to separate manganese from gangue, and obtain lump manganese concentrate and lump tailings;

[0101] Step 5, feeding the second type of lump ore in the second type silo into three jigs by using an electric vibrating feeder, and the ore is stratified in the trough of the jig according to the density difference, the material with low density is in the upper layer and enters the tailings with the water flow, and the material with high density is in the lower layer and is discharged from the concentrate port under the action of gravity, thereby achieving the separation of manganese and gangue, and obtaining massive manganese concentrate and massive tailings;

[0102] Step 6, combining the lump color separation concentrate obtained in step 4 and the lump jigging concentrate obtained in step 5 as the final manganese concentrate with a manganese grade of not less than 35% to 38%, and loading and transporting them to the port for sale;

[0103] Step 7, combining the bulk color sorting tailings obtained in step 4 and the bulk jigging tailings obtained in step 5 together as the final tailings, which flow into the tailings pond through the tailings pipe.

[0104] In summary, the manganese concentrate separation method of the embodiment of the present invention adopts crushing to replace the grinding in the traditional process, which reduces the amount of secondary ore mud and the metal loss caused by it, and also creates favorable conditions for producing high-value bulk manganese concentrate; adopts the screening process after washing to improve the selected grade of the selected ore, creates favorable conditions for jigging or color sorting, and obtains powdered manganese concentrate; according to the difference in color and density of the ore, a photoelectric jigging combined separation method that is harmonious with the ore properties is invented to improve the manganese recovery rate; a color sorting and separation method of manganese ore is proposed for the first time; no ore dressing agent is used, and the ore dressing wastewater can be reused after clarification without treatment, which does not pollute the surrounding environment and saves water. The manganese ore dressing method of the present invention can obtain bulk manganese concentrate, with high concentrate grade and recovery rate, improved ore dressing efficiency, simple process flow, convenient operation and management, and suitable for industrial production.

[0105] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A method for separating low-grade manganese oxide ore, characterized in that: include: Step 1: According to the color difference between manganese and gangue, the red and brown low-grade manganese oxide ore are piled together as the first type of ore to be subsequently sorted by a color sorter; according to the density difference between manganese and gangue, the low-grade manganese oxide ore with a gravity separation selectivity coefficient E≥1.75 is piled together as the second type of ore to be subsequently sorted by a jig; the first type of ore and the second type of ore are separately piled and sorted; Step 2, crushing, washing and screening the first type of raw ore and the second type of raw ore respectively to obtain a powdered manganese concentrate and a first type of lump ore corresponding to the first type of raw ore, and to obtain a powdered manganese concentrate and a second type of lump ore corresponding to the second type of raw ore; Step 3, the first type of lump ore and the second type of lump ore obtained in step 2 are respectively sent to a first silo and a second silo by different belt conveyors, wherein the first silo is used to store the first type of lump ore as color sorting material, and the second silo is used to store the second type of lump ore as jigging sorting material; Step 4, feeding the first type of lump ore in the first silo into a color sorter by a feeder, separating manganese and gangue according to color differences, and obtaining lump manganese concentrate and lump tailings; Step 5, feeding the second type of lump ore in the second silo into a jig through a feeder, separating manganese and gangue according to density difference, and obtaining lump manganese concentrate and lump tailings; Step 6, combining the bulk manganese concentrates obtained in step 4 and step 5 as the final separated manganese concentrate; Step 7, combining the block tailings obtained in step 4 and step 5 together as the tailings after final sorting.

2. The method for separating low-grade manganese oxide ore according to claim 1, characterized in that: In step 2, the first type of raw ore and the second type of raw ore are crushed, washed and screened in the same manner, both including: Step 21, feeding the raw ore into a crusher for crushing to obtain crushed ore of a predetermined particle size, wherein the raw ore is the first type of raw ore or the second type of raw ore; Step 22, sending the crushed ore obtained in step 21 into a trough-type ore washer for ore washing to obtain ore mud and coarse-grained ore; Step 23, transporting the sludge obtained in step 22 to a tailings pond via a tailings pipe; Step 24, sending the coarse-grained ore obtained in step 22 to a vibrating screen via a belt conveyor for screening to obtain powdered manganese concentrate and lump ore, when the raw ore in step 21 is the first type of raw ore, the obtained lump ore is the first type of lump ore corresponding to the first type of raw ore, and when the raw ore in step 21 is the second type of raw ore, the obtained lump ore is the second type of lump ore corresponding to the second type of raw ore; Step 25: The powdered manganese concentrate obtained in step 24 is directly sold.

3. The method for separating low-grade manganese oxide ore according to claim 2, characterized in that: In step 21, the raw ore is fed into a crusher for crushing using a single-stage crushing method.

4. The method for separating low-grade manganese oxide ore according to claim 2, characterized in that: In step 21, a predetermined particle size of the crushed ore of -40 mm is obtained.

5. The method for separating low-grade manganese oxide ore according to any one of claims 1 to 3, characterized in that: In the step 4, before the first type of lump ore in the first silo is fed into the color sorter by the feeder, the first type of lump ore in the first silo is screened by a vibrating screen, and the mesh size of the vibrating screen is 8 mm×8 mm.

6. The method for separating low-grade manganese oxide ore according to any one of claims 1 to 3, characterized in that: In the step 5, before the second type of lump ore in the second silo is fed into the jig by the feeder, the second type of lump ore in the second silo is screened by a vibrating screen, and the mesh size of the vibrating screen is 8 mm×8 mm.

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