Method for advanced tailing discarding-flotation deep impurity removal and purification of high-calcium and high-magnesium rhodochrosite

Abstract

The invention discloses a method for advanced tailing discarding-flotation deep impurity removal and purification of high-calcium and high-magnesium rhodochrosite, and belongs to the technical field of mineral processing. According to the method, ores with high calcium and magnesium content are removed in advance by utilizing an X-ray intelligent separation technology, the pre-selected ores are subjected to fine crushing and ore grinding, and then non-magnetic substances are thrown out by utilizing a magnetic field, so that magnetic concentrate is obtained. The magnetic concentrate is subjected to rough reverse flotation and fine reverse flotation, the content of calcium and magnesium impurity minerals is further reduced by adjusting the pH value of ore pulp in the reverse flotation process and utilizing different collecting agents, and the purity of the concentrate is improved. Through the multi-stage separation and flotation process, calcium and magnesium impurities are successfully removed, the grade and the recovery rate of the manganese concentrate are improved, and high-quality raw materials are provided for subsequent leaching operation.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing, and particularly relates to a method for pre-tailing-discarding-flotation deep impurity removal and purification of high-calcium-magnesium rhodochrosite. Background Art

[0002] China is an important country in the development, processing and consumption of manganese ore resources in the world. The development and utilization of manganese ore resources is of great significance to the country's industrial development. China's manganese ore resources are unevenly distributed, of which 55.9% belong to rhodochrosite, and have the characteristics of few rich ores, many poor ores, high calcium and magnesium impurity content and great difficulty in utilization. At present, China's dependence on foreign manganese ore has exceeded 90%. Therefore, improving the efficient development and utilization of rhodochrosite is of great significance to improving the self-sufficiency rate of manganese ore resources in my country.

[0003] Patent CN109225651A discloses a flotation method for high-calcium rhodochrosite. This method suppresses rhodochrosite by flotation of calcium carbonate, significantly reduces the content of calcium carbonate, and has a good calcium removal effect. However, rhodochrosite usually also contains a high magnesium content, and this method does not mention the removal effect of magnesium. Rhodochrosite is a raw material for preparing electrolytic manganese metal. The calcium and magnesium content in the ore is positively correlated with the dosage of the leaching agent in the preparation of the electrolyte, the leaching time, the dosage of the impurity removal agent in the impurity removal process, and the pH adjuster. A larger dosage of the agent will result in more electrolytic manganese slag produced during the electrolysis process, and the electrolytic manganese slag contains Mn 2+ , NH3-N and other soluble ions, which bring great burden to the ecological environment. In view of the above situation, the present invention proposes a process of pre-tailing-flotation deep impurity removal and purification of high-calcium magnesium rhodochrosite. Summary of the invention

[0004] The primary purpose of the present invention is to provide a method for pre-deep impurity removal of rhodochrosite, aiming to remove calcium and magnesium in rhodochrosite, thereby reducing the amount of reagents used in subsequent leaching operations of rhodochrosite and improving the leaching rate of manganese.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for pre-tailing-flotation deep impurity removal and purification of high-calcium-magnesium rhodochrosite comprises the following steps:

[0007] 1. Crushing the rhodochrosite to a particle size of ≤130 mm to obtain a crushed product;

[0008] 2. The crushed products are sent to the sorting machine through a conveyor belt for sorting to obtain sorted concentrate and sorted tailings;

[0009] 3. Grind the selected concentrate to a particle size of ≤0.5mm to obtain a crushed product, wherein -0.074mm ore powder accounts for more than 80% of the total mass of the selected concentrate;

[0010] 4. Subject the crushed and ground products to strong magnetic separation to obtain magnetically separated manganese concentrate and magnetically separated tailings;

[0011] 5. Add the magnetically separated manganese concentrate to a sodium carbonate solution with a mass concentration of 1% to 5% for slurry preparation, then add the amine collector 1, mix evenly, and perform reverse flotation to obtain a first-stage coarse reverse flotation concentrate as the product in the tank, and a first-stage coarse reverse flotation tailing as the foam product;

[0012] 6. Add inhibitors and amine collector 2 to the first stage rough reverse flotation concentrate to carry out second stage fine reverse flotation. The obtained in-tank product is the second stage fine reverse flotation concentrate, and the foam product is the second stage fine reverse flotation tailings. The second stage fine reverse flotation concentrate is the final concentrate, and the pre-selection tailings, magnetic separation tailings, first stage rough reverse flotation tailings and second stage fine reverse flotation tailings are combined into the final tailings.

[0013] Further, in step 1, the chemical composition of rhodochrosite includes: Mn 20.00wt% to 33.00wt%, MgO 3.00wt% to 13.00wt%, CaO 4.00wt% to 15.00wt%;

[0014] Furthermore, in step 2, the sorting machine is an X-ray intelligent sorting machine, the conveyor belt width is 1.6m to 3.0m, and the conveyor belt speed is 1m / s to 3m / s;

[0015] Further, in step 4, the magnetic field strength during the strong magnetic separation process is 6000Oe to 20000Oe;

[0016] Further, in step 5, the pH of the product obtained by slurry adjustment is 8.0-12.0, the slurry adjustment time is 2 min-4 min, the temperature of the first coarse reverse flotation slurry is room temperature, the slurry mass concentration is 20%-40%, the amine collector 1 is a silicate ether amine collector, the addition time of the collector solution is 3 min-5 min, the addition amount is 200 g / t-2000 g / t based on rhodochrosite, and the flotation scraping time is 3 min-8 min;

[0017] Further, in step 6, the amount of the inhibitor used is 50g / t to 800g / t based on rhodochrosite, and the inhibitor is composed of 5 to 200 parts of dextrin and 50 to 400 parts of carboxymethyl cellulose by mass. The amine collector 2 is a calcium-magnesium mixed amine collector, and the amount added is 200g / t to 1500g / t based on rhodochrosite. The addition time of the amine collector 2 is 3min-5min, the mass concentration of the ore pulp is 10% to 30%, and the flotation scraping time is 3min-6min;

[0018] Furthermore, in step 6, the post-processing step for the product in the tank is specifically performed as follows: drying the product in the tank to obtain manganese concentrate.

[0019] Compared with the existing rhodochrosite impurity removal process, the characteristics and advantages of the present invention are:

[0020] 1. The present invention realizes the efficient comprehensive utilization of high-calcium and high-magnesium rhodochrosite, the manganese grade and manganese recovery rate in the product are high, and the calcium and magnesium removal effects are remarkable.

[0021] 2. The present invention uses X-ray intelligent pre-selection and magnetic separation to pre-discard tailings before flotation, which greatly reduces the use of subsequent flotation reagents and reduces economic costs.

[0022] 3. The first stage rough reverse flotation of the present invention mainly removes silicate minerals, which not only reduces the interference of fine mud in the subsequent second stage fine reverse flotation, reduces the amount of reagents used in the second stage rough reverse flotation, but also avoids the mutual activation between silicate minerals and calcium magnesium carbonate minerals in conventional flotation, thereby improving the separation index of manganese.

[0023] 4. The process flow of pre-tailing discarding and deep impurity removal and purification of rhodochrosite ore proposed in the present invention is simple, and the relevant technology is relatively mature, which is conducive to reducing the production cost of subsequent electrolytic manganese operations and is convenient for industrial promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic flow chart of a method for pre-tailing-flotation deep impurity removal and purification of high-calcium-magnesium rhodochrosite. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and examples. The g / t mentioned in this application refers to the mass of the reagent added per ton of raw ore; the percentages mentioned are all mass percentages. The test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials can be obtained from commercial channels unless otherwise specified, and the preferred embodiments described are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0026] The present invention provides a method for pre-discarding tailings and flotation deep impurity removal and purification of high calcium magnesium rhodochrosite, the process flow is as follows: Figure 1As shown in the figure, the key points of its principle and technology are: using X-ray intelligent sorting technology to pre-remove ores with high calcium and magnesium content, thereby reducing the interference of impurities in the subsequent flotation process and improving the flotation efficiency. The pre-selected ore is crushed and ground to fully dissociate the mineral monomers, which is conducive to flotation separation. In the magnetic separation process, the magnetic field is used to throw out non-magnetic substances to obtain high-grade manganese concentrate. Subsequently, in the rough reverse flotation stage, the pH value of the ore pulp is adjusted by sodium carbonate solution to change the surface characteristics of the mineral and enhance the flotation effect. The silicate ether amine collector 1 is used to effectively remove impurities such as magnesium with high efficiency and selectivity. In the second stage of fine reverse flotation, inhibitors and calcium-magnesium mixed amine collectors 2 are added to further remove the content of calcium-magnesium impurity minerals and improve the purity of the concentrate. Through multi-stage sorting and flotation processes, calcium and magnesium impurities are successfully removed, the grade and recovery rate of manganese concentrate are improved, and high-quality raw materials are provided for subsequent leaching operations.

[0027] The conveyor belt width of the X-ray intelligent sorting machine used in the embodiment of the present invention is 1.6m to 3.0m, and the conveyor belt speed is 1m / s to 3m / s.

[0028] In the method provided by the present invention, the chemical composition of the rhodochrosite used includes: Mn 20.00wt%-33.00wt%, MgO 3.00wt%-13.00wt%, and CaO 4.00wt%-15.00wt%.

[0029] In the method provided by the present invention, the pulping time in the first stage of rough reverse flotation is 2 minutes to 4 minutes.

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

[0031] Embodiment 1:

[0032] A method for efficiently removing impurities and purifying high-calcium and high-magnesium rhodochrosite comprises the following steps:

[0033] The rhodochrosite in this embodiment comes from the Akto-Wuqia region of Xinjiang, wherein the Mn content is 30.53 wt%, the MgO content is 5.68 wt%, and the CaO content is 7.44 wt%.

[0034] 1. Feed the rhodochrosite ore into a coarse crusher for crushing to obtain a crushed product with a particle size of less than 120 mm.

[0035] 2. The crushed products are transported to the X-ray intelligent sorting machine via a conveyor belt for sorting to obtain sorted concentrates and sorted tailings.

[0036] 3. Grind the selected concentrate to a particle size of less than 0.5 mm to obtain a crushed sample, of which -0.074 mm ore powder accounts for 85% of the total mass of the selected concentrate.

[0037] 4. The crushed and ground products are fed into a vertical ring high-intensity magnetic separator with a magnetic field strength of 14000Oe to obtain magnetic concentrate and magnetic tailings.

[0038] 5. The magnetically separated manganese concentrate is added with a sodium carbonate solution with a mass percentage concentration of 2% to perform slurry adjustment at room temperature until the pH value is 9 and the slurry concentration is 30%. Then, 650 g / t silicate ether amine collector 1 is added for a dosing time of 3 min to perform reverse flotation. After scraping the foam for 6 min, the obtained foam product is a first-stage coarse reverse flotation tailings, and the obtained in-tank product is a first-stage coarse reverse flotation concentrate;

[0039] 6. Add 700g / t of mixed depressant of dextrin: carboxymethyl cellulose = 2:1 and 750g / t of calcium-magnesium mixed amine collector 2 to the first stage rough reverse flotation concentrate for second stage fine reverse flotation, the pulp concentration is 20%, the dosing time is 3min, the reverse flotation scraping time is 5min, the product in the tank is dried to be the second stage fine reverse flotation concentrate, and the foam product is the second stage fine reverse flotation tailings. The second stage fine reverse flotation concentrate is the final concentrate, and the sorting tailings, magnetic separation tailings, first stage rough reverse flotation tailings and second stage fine reverse flotation tailings are combined into the final tailings. The product in the tank is dried to obtain manganese concentrate, and the final manganese concentrate grade is 37.65wt%; MgO content is 1.53wt%; CaO content is 1.89wt%, manganese recovery rate is 84.84%, CaO removal rate is 82.53%, and MgO removal rate is 81.46%.

[0040] Table 1. Ore dressing results of Example 1

[0041]

[0042] Embodiment 2:

[0043] The rhodochrosite has a Mn content of 26.24 wt%, a MgO content of 9.88 wt%, and a CaO content of 7.63 wt%.

[0044] 1. Feed the rhodochrosite ore into a coarse crusher for crushing to obtain a crushed product with a particle size of less than 120 mm.

[0045] 2. The crushed products are transported to the X-ray intelligent sorting machine for sorting to obtain sorted concentrates and sorted tailings.

[0046] 3. Grind the selected concentrate to a particle size of less than 0.5 mm to obtain a crushed sample, of which -0.074 mm ore powder accounts for 80% of the total mass of the selected concentrate.

[0047] 4. The crushed and ground products are fed into a vertical ring high-intensity magnetic separator with a magnetic field strength of 14000Oe to obtain magnetic concentrate and magnetic tailings.

[0048] 5. Add the magnetically separated manganese concentrate to a sodium carbonate solution with a mass percentage concentration of 2% for slurry adjustment at room temperature until the pH value is 10 and the slurry concentration is 30%. Then, 1400 g / t silicate ether amine collector 1 is added for a dosing time of 3 min to perform reverse flotation. After scraping the foam for 6 min, the obtained foam product is a first-stage coarse reverse flotation tailings, and the obtained in-tank product is a first-stage coarse reverse flotation concentrate.

[0049] 6. Add 600g / t of mixed depressant of dextrin: carboxymethyl cellulose = 3:1 and 800g / t of calcium-magnesium mixed amine collector 2 to the first stage rough reverse flotation concentrate for second stage fine reverse flotation, with a pulp concentration of 20%, a dosing time of 3min, and a reverse flotation scraping time of 5min. The obtained product in the tank is dried to obtain the second stage fine reverse flotation concentrate, and the foam product is the second stage fine reverse flotation tailings. The second stage fine reverse flotation concentrate is the final concentrate, and the sorting tailings, magnetic separation tailings, first stage rough reverse flotation tailings and second stage fine reverse flotation tailings are combined into the final tailings. The product in the tank is dried to obtain manganese concentrate, and the final manganese concentrate grade is 35.10wt%; MgO content is 1.91wt%; CaO content is 1.24wt%, manganese concentrate recovery rate is 84.55%, CaO removal rate is 89.73%, and MgO removal rate is 87.77%.

[0050] Table 2. Ore dressing results of Example 2

[0051]

[0052] Embodiment 3:

[0053] The rhodochrosite has a Mn content of 31.14 wt%, a MgO content of 5.78 wt%, and a CaO content of 9.83 wt%.

[0054] 1. Feed the rhodochrosite ore into a coarse crusher for crushing to obtain a crushed product with a particle size of less than 120 mm.

[0055] 2. The crushed products are transported to the X-ray intelligent sorting machine via a conveyor belt for sorting to obtain sorted concentrates and sorted tailings.

[0056] 3. Grind the selected concentrate to a particle size of less than 0.5 mm to obtain a crushed sample, of which -0.074 mm ore powder accounts for 85% of the total mass of the selected concentrate.

[0057] 4. The crushed and ground products are fed into a vertical ring high-intensity magnetic separator with a magnetic field strength of 14000Oe to obtain magnetic concentrate and magnetic tailings.

[0058] 5. The magnetically separated manganese concentrate is added with a sodium carbonate solution with a mass percentage concentration of 2% to perform slurry adjustment at room temperature until the pH value is 10 and the slurry concentration is 30%. Then, 700 g / t silicate ether amine collector 1 is added for a dosing time of 3 min to perform reverse flotation. After scraping the foam for 6 min, the obtained foam product is a first-stage coarse reverse flotation tailings, and the obtained in-tank product is a first-stage coarse reverse flotation concentrate;

[0059] 6. Add 720g / t of mixed inhibitor of dextrin: carboxymethyl cellulose = 2:1 and 1000g / t of calcium-magnesium mixed amine collector 2 to the first stage rough reverse flotation concentrate for second stage fine reverse flotation, the pulp concentration is 20%, the dosing time is 3min, the reverse flotation scraping time is 5min, the product in the tank is dried to be the second stage fine reverse flotation concentrate, and the foam product is the second stage fine reverse flotation tailings. The second stage fine reverse flotation concentrate is the final concentrate, and the sorting tailings, magnetic separation tailings, first stage rough reverse flotation tailings and second stage fine reverse flotation tailings are combined into the final tailings. The product in the tank is dried to obtain manganese concentrate, and the final manganese concentrate grade is 37.56wt%; MgO content is 0.78wt%; CaO content is 2.51wt%, manganese concentrate recovery rate is 81.89%, CaO removal rate is 82.67%, and MgO removal rate is 90.84%.

[0060] Table 3. Ore dressing results of Example 3

[0061]

[0062] Embodiment 4:

[0063] The rhodochrosite has a Mn content of 29.61 wt%, a MgO content of 6.59 wt%, and a CaO content of 4.05 wt%.

[0064] 1. Feed the rhodochrosite ore into a coarse crusher for crushing to obtain a crushed product with a particle size of less than 120 mm.

[0065] 2. The crushed products are transported to the X-ray intelligent sorting machine via a conveyor belt for sorting to obtain sorted concentrates and sorted tailings.

[0066] 3. The selected concentrate is crushed to a particle size of less than 0.5 mm to obtain a crushed sample, of which -0.074 mm ore powder accounts for 85% of the total mass of the selected concentrate.

[0067] 4. The crushed and ground products are fed into a vertical ring high-intensity magnetic separator with a magnetic field strength of 14000Oe to obtain magnetic concentrate and magnetic tailings.

[0068] 5. The magnetically separated manganese concentrate is added to a sodium carbonate solution with a mass percentage concentration of 2% for slurry adjustment at room temperature to a pH of 9 and a slurry concentration of 35%, and then 800 g / t of silicate ether amine collector 1 is added for a dosing time of 3 min to perform reverse flotation. After scraping the foam for 6 min, the obtained foam product is a first-stage coarse reverse flotation tailing, and the obtained in-tank product is a first-stage coarse reverse flotation concentrate;

[0069] 6. Add 700g / t of mixed depressant of dextrin: carboxymethyl cellulose = 5:2 and 600g / t of calcium-magnesium mixed amine collector 2 to the first stage rough reverse flotation concentrate for second stage fine reverse flotation, the pulp concentration is 25%, the dosing time is 3min, the reverse flotation scraping time is 5min, the obtained product in the tank is the second stage fine reverse flotation concentrate after drying, and the foam product is the second stage fine reverse flotation tailings. The second stage fine reverse flotation concentrate is the final concentrate, and the sorting tailings, magnetic separation tailings, first stage rough reverse flotation tailings and second stage fine reverse flotation tailings are combined into the final tailings. The product in the tank is dried to obtain manganese concentrate, and the final manganese concentrate grade is 36.11wt%; MgO content is 1.22wt%; CaO content is 1.02wt%, manganese concentrate recovery rate is 81.90%, CaO removal rate is 83.08%, and MgO removal rate is 87.52%.

[0070] Table 4. Ore dressing results of Example 4

[0071]

[0072] Embodiment 5:

[0073] The rhodochrosite has a Mn content of 33.87 wt%, a MgO content of 3.56 wt%, and a CaO content of 8.44 wt%.

[0074] 1. Feed the rhodochrosite ore into a coarse crusher for crushing to obtain a crushed product with a particle size of less than 120 mm.

[0075] 2. The crushed products are transported to the X-ray intelligent sorting machine via a conveyor belt for sorting to obtain sorted concentrates and sorted tailings.

[0076] 3. Grind the selected concentrate to a particle size of less than 0.5 mm to obtain a crushed sample, of which -0.074 mm ore powder accounts for 85% of the total mass of the selected concentrate.

[0077] 4. The crushed and ground products are fed into a vertical ring high-intensity magnetic separator with a magnetic field strength of 14000Oe to obtain magnetic concentrate and magnetic tailings.

[0078] 5. Add the magnetically separated manganese concentrate to a sodium carbonate solution with a mass percentage concentration of 5% to carry out slurry adjustment at room temperature until the pH value is 12 and the slurry concentration is 34%. Then, 450 g / t silicate ether amine collector 1 is added for a dosing time of 3 min to carry out reverse flotation. After scraping the foam for 6 min, the obtained foam product is a first-stage coarse reverse flotation tailings, and the obtained in-tank product is a first-stage coarse reverse flotation concentrate.

[0079] 6. Add 800g / t of mixed depressant of dextrin: carboxymethyl cellulose = 3:1 and 850g / t of calcium-magnesium mixed amine collector 2 to the first stage rough reverse flotation concentrate for second stage fine reverse flotation, the pulp concentration is 25%, the dosing time is 3min, the reverse flotation scraping time is 5min, the obtained product in the tank is the second stage fine reverse flotation concentrate after drying, and the foam product is the second stage fine reverse flotation tailings. The second stage fine reverse flotation concentrate is the final concentrate, and the sorting tailings, magnetic separation tailings, first stage rough reverse flotation tailings and second stage fine reverse flotation tailings are combined into the final tailings. The product in the tank is dried to obtain manganese concentrate, and the final manganese concentrate grade is 40.12wt%; MgO content is 0.76wt%; CaO content is 1.56wt%, manganese concentrate recovery rate is 79.21%, CaO removal rate is 87.64%, and MgO removal rate is 85.73%.

[0080] Table 5. Ore dressing results of Example 5

[0081]

[0082] Embodiment 6:

[0083] The rhodochrosite has a Mn content of 25.51 wt%, a MgO content of 6.64 wt%, and a CaO content of 11.69 wt%.

[0084] 1. Feed the rhodochrosite ore into a coarse crusher for crushing to obtain a crushed product with a particle size of less than 120 mm.

[0085] 2. The crushed products are transported to the X-ray intelligent sorting machine via a conveyor belt for sorting to obtain sorted concentrate and pre-selected tailings.

[0086] 3. Grind the selected concentrate to a particle size of less than 0.5 mm to obtain a crushed sample, of which -0.074 mm ore powder accounts for 85% of the total mass of the selected concentrate.

[0087] 4. The crushed and ground products are fed into a vertical ring high-intensity magnetic separator with a magnetic field strength of 14000Oe to obtain magnetic concentrate and magnetic tailings.

[0088] 5. The magnetically separated manganese concentrate is added with a sodium carbonate solution with a mass percentage concentration of 1% to perform slurry adjustment at room temperature until the pH value is 8 and the slurry concentration is 20%. Then, 820 g / t silicate ether amine collector 1 is added for a dosing time of 3 min to perform reverse flotation. After scraping the foam for 6 min, the obtained foam product is a first-stage coarse reverse flotation tailings, and the obtained in-tank product is a first-stage coarse reverse flotation concentrate;

[0089] 6. Add 600g / t of mixed inhibitor of dextrin: carboxymethyl cellulose = 2:1 and 1300g / t of calcium-magnesium mixed amine collector 2 to the first stage rough reverse flotation concentrate for second stage fine reverse flotation, the pulp concentration is 15%, the dosing time is 3min, the reverse flotation scraping time is 5min, the obtained tank product is the second stage fine reverse flotation concentrate after drying, and the foam product is the second stage fine reverse flotation tailings. The second stage fine reverse flotation concentrate is the final concentrate, and the sorting tailings, magnetic separation tailings, first stage rough reverse flotation tailings and second stage fine reverse flotation tailings are combined into the final tailings. The tank product is dried to obtain manganese concentrate, and the final manganese concentrate grade is 33.61wt%; MgO content is 1.78wt%; CaO content is 2.68wt%, manganese concentrate recovery rate is 86.05%, CaO removal rate is 85.02%, and MgO removal rate is 82.48%.

[0090] Table 6. Ore dressing results of Example 6

[0091]

Claims

1. A method for pre-tailing-flotation deep impurity removal and purification of high calcium magnesium rhodochrosite, characterized in that: The following steps are involved: Step 1: crushing the rhodochrosite to a particle size of ≤130 mm to obtain a crushed product; Step 2: The crushed products are sent to the sorting machine through a conveyor belt for sorting to obtain X-ray intelligent sorting concentrate and sorting tailings; Step 3: Grind the selected concentrate to a particle size of ≤0.5 mm to obtain a ground product; Step 4: subjecting the crushed and ground products to strong magnetic separation to obtain magnetically separated manganese concentrate and magnetically separated tailings; Step 5: adding the magnetically separated manganese concentrate to the sodium carbonate solution for slurry preparation, then adding the amine collector 1, mixing evenly, and performing reverse flotation, the product in the tank is a first-stage coarse reverse flotation concentrate, and the foam product is a first-stage coarse reverse flotation tailings; Step 6: adding inhibitor and collector 2 to the first stage rough reverse flotation concentrate, and performing second stage fine reverse flotation to obtain second stage fine reverse flotation concentrate and second stage fine reverse flotation tailings; the second stage fine reverse flotation concentrate is the final concentrate, and the sorting tailings, magnetic separation tailings, first stage rough reverse flotation tailings and second stage fine reverse flotation tailings are combined into the final tailings.

2. The method for pre-tailing-flotation deep impurity removal and purification of high-calcium magnesium rhodochrosite according to claim 1, characterized in that: In step 1, the chemical composition of rhodochrosite includes: Mn 20.00wt% to 33.00wt%, MgO 3.00wt% to 13.00wt%, and CaO 4.00wt% to 15.00wt%.

3. The method for pre-tailing-flotation deep impurity removal and purification of a high-calcium magnesium rhodochrosite according to claim 1, characterized in that: In step 2, the sorting machine is an X-ray intelligent sorting machine, the conveyor belt width is 1.6m to 3.0m, and the conveyor belt speed is 1m / s to 3m / s.

4. The method for pre-tailing-flotation deep impurity removal and purification of high-calcium magnesium rhodochrosite according to claim 1, characterized in that: In step 3, the mineral powder with a particle size of -0.074 mm in the crushed product accounts for more than 80% of the total mass of the selected concentrate.

5. The method for pre-tailing-flotation deep impurity removal and purification of high-calcium magnesium rhodochrosite according to claim 1, characterized in that: In step 4, the magnetic field strength during the magnetic separation process is 6000Oe to 20000Oe.

6. The method for pre-tailing-flotation deep impurity removal and purification of high-calcium magnesium rhodochrosite according to claim 1, characterized in that: In step 5, the mass concentration of the sodium carbonate solution is 1% to 5%, the slurry adjustment time is 2 min to 4 min, and the pH of the product obtained by slurry adjustment is 8.0 to 12.0; During the first stage rough reverse flotation, the slurry temperature is room temperature and the slurry mass concentration is 20% to 40%.

7. The method for pre-tailing-flotation deep impurity removal and purification of high-calcium magnesium rhodochrosite according to claim 1, characterized in that: In step 5, the amine collector 1 is a silicate ether amine collector; the amine collector 1 is added for 3 min to 5 min, and the amount added is 200 g / t to 2000 g / t based on rhodochrosite; During the reverse flotation process, the scraping time is 3min-8min.

8. The method for pre-tailing-flotation deep impurity removal and purification of high-calcium magnesium rhodochrosite according to claim 1, characterized in that: In step 6, the inhibitor is composed of 5 to 200 parts of dextrin and 50 to 400 parts of carboxymethyl cellulose, by weight.

9. The method for pre-tailing-flotation deep impurity removal and purification of high-calcium magnesium rhodochrosite according to claim 1, characterized in that: In step 6, the amine collector 2 is a calcium-magnesium mixed amine collector; based on rhodochrosite, the amount of inhibitor added is 50 g / t to 800 g / t, and the amount of amine collector 2 added is 200 g / t to 1500 g / t; The addition time of the amine collector 2 is 3 min to 5 min, and the mass concentration of the ore pulp is 10% to 30%; During the reverse flotation process, the scraping time is 3min-6min.

10. The method for pre-tailing-flotation deep impurity removal and purification of high-calcium magnesium rhodochrosite according to claim 1, characterized in that: In step 6, the post-processing step for the product in the tank is carried out, and the specific operation of the post-processing is: drying the product in the tank to obtain manganese concentrate.

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