A method for pre-throwing tailings-flotation deep impurity removal and purification of high calcium-magnesium rhodochrosite

Abstract

A method for pre-tailings removal and flotation-based deep purification of high-calcium-magnesium rhodochrosite belongs to the field of mineral processing technology. This invention utilizes X-ray intelligent separation technology to pre-remove ores with high calcium and magnesium content. The pre-selected ore is then finely crushed and ground, followed by the removal of non-magnetic substances using a magnetic field to obtain a magnetic concentrate. The magnetic concentrate is then subjected to rough reverse reverse flotation and fine reverse reverse flotation. By adjusting the pH value of the pulp during the reverse flotation process and using different collectors, the content of calcium and magnesium impurities is further removed, improving the purity of the concentrate. This invention, through multi-stage separation and flotation processes, successfully removes calcium and magnesium impurities, improves the grade and recovery rate of manganese concentrate, and provides high-quality raw materials for subsequent leaching operations.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, and specifically relates to a method for pre-tailings removal and flotation deep purification of high-calcium magnesium rhodochrosite. Background Technology

[0002] Patent CN109225651A discloses a flotation method for high-calcium rhodochrosite. This method inhibits rhodochrosite by flotation of calcium carbonate, significantly reducing the calcium carbonate content and demonstrating good calcium removal efficiency. However, rhodochrosite typically contains high levels of magnesium, and this method does not address magnesium removal efficiency. As a raw material for preparing electrolytic manganese metal, the calcium and magnesium content in rhodochrosite is positively correlated with the dosage of leaching agent, leaching time, the dosage of impurity removal agent, and pH adjuster used in the electrolyte preparation process. Higher reagent dosages lead to the generation of more electrolytic manganese slag during electrolysis, and this slag contains Mn. 2+ Soluble ions such as NH3-N place a significant burden on the ecological environment. In response to this situation, this invention proposes a pre-tailings removal-flotation deep purification process for high-calcium-magnesium rhodochrosite. Summary of the Invention

[0003] The primary objective of this invention is to provide a method for pre-deep purification of rhodochrosite, which aims to remove calcium and magnesium from the rhodochrosite, thereby reducing the amount of reagents used in subsequent leaching operations and increasing the manganese leaching rate.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A method for pre-tailings removal and flotation depth purification of high-calcium magnesium rhodochrosite includes the following steps:

[0006] 1. Crush rhodochrosite to a particle size ≤130mm to obtain the crushed product;

[0007] 2. The crushed product is conveyed to a separator via a conveyor belt for separation to obtain separated concentrate and separated tailings;

[0008] 3. Grind the sorted concentrate to a particle size ≤0.5mm to obtain the crushed product; wherein the -0.074mm mineral powder accounts for more than 80% of the total mass of the sorted concentrate;

[0009] 4. The crushed and ground products are subjected to high-intensity magnetic separation to obtain magnetically separated manganese concentrate and magnetically separated tailings;

[0010] 5. Add the magnetically separated manganese concentrate to a sodium carbonate solution with a mass concentration of 1%~5% for slurry preparation, then add amine collector 1, mix evenly, and perform reverse flotation to obtain the product in the tank as the first-stage rough reverse flotation concentrate, and the froth product as the first-stage rough reverse flotation tailings.

[0011] 6. Add inhibitors and amine collector 2 to the first-stage rough reverse flotation concentrate and perform second-stage fine reverse flotation. The product obtained in the tank is the second-stage fine reverse flotation concentrate, and the froth 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.

[0012] Furthermore, in step 1, the chemical composition of rhodochrosite includes: Mn 20.00wt%~33.00wt%, MgO 3.00wt%~13.00wt%, and CaO 4.00wt%~15.00wt%.

[0013] Furthermore, in step 2, the sorting machine is an X-ray intelligent sorting machine with a conveyor belt width of 1.6m to 3.0m and a conveyor belt speed of 1m / s to 3m / s;

[0014] Furthermore, in step 4, the magnetic field strength during the strong magnetic separation process is 6000 Oe to 20000 Oe;

[0015] Furthermore, in step 5, the pH of the product obtained by slurry conditioning is 8.0~12.0, the slurry conditioning time is 2min~4min, the temperature of the first-stage rough 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 3min-5min, the addition amount is 200g / t~2000g / t based on rhodochrosite, and the flotation skimming time is 3min-8min;

[0016] Furthermore, in step 6, the amount of inhibitor added is 50g / t to 800g / t based on rhodochrosite. By mass, the inhibitor is composed of 5 to 200 parts of dextrin and 50 to 400 parts of carboxymethyl cellulose. 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 to 5min, the slurry mass concentration is 10% to 30%, and the flotation skimming time is 3min to 6min.

[0017] Furthermore, in step 6, the post-processing step for the product in the tank involves drying the product in the tank to obtain manganese concentrate.

[0018] Compared with existing rhodochrosite impurity removal processes, the features and advantages of this invention are as follows:

[0019] 1. This invention achieves efficient and comprehensive utilization of high-calcium and high-magnesium rhodochrosite, with high manganese grade and recovery rate in the product, and significant calcium and magnesium removal effects.

[0020] 2. This invention employs X-ray intelligent pre-selection and magnetic separation for pre-tailing before flotation, which greatly reduces the use of subsequent flotation reagents and lowers economic costs.

[0021] 3. The first-stage rough reverse flotation of this invention mainly removes silicate minerals, which not only reduces the interference of fine mud in the subsequent second-stage fine reverse flotation and 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 manganese separation index.

[0022] 4. The process of pre-tailings removal and flotation deep purification of rhodochrosite proposed in this invention is simple and the related technologies are relatively mature. It is conducive to reducing the production cost of subsequent electrolytic manganese operations and facilitates industrial promotion. Attached Figure Description

[0023] Figure 1 A schematic diagram of a process for pre-tailings removal and flotation deep purification of high-calcium magnesium rhodochrosite. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. In this application, g / t refers to the mass of reagent added per ton of raw ore; all percentage contents are mass percentages. Unless otherwise specified, the test methods described in the following embodiments are conventional methods; unless otherwise specified, the reagents and materials are commercially available, and the preferred embodiments described are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0025] The present invention discloses a method for pre-tailings removal and flotation deep purification of high-calcium magnesium rhodochrosite, the process flow of which is as follows: Figure 1 As shown, the principle and key technology are as follows: X-ray intelligent separation technology is used to pre-remove ores with high calcium and magnesium content, thereby reducing impurity interference in subsequent flotation processes and improving flotation efficiency. The pre-selected ore undergoes fine crushing and grinding to fully liberate the minerals, facilitating flotation separation. During magnetic separation, a magnetic field is used to eject non-magnetic substances, yielding high-grade manganese concentrate. Subsequently, in the roughing reverse flotation stage, the pH of the pulp is adjusted using sodium carbonate solution to alter mineral surface characteristics and enhance flotation performance. A silicate ether amine collector 1 is used to efficiently and selectively remove impurities such as magnesium. In the second-stage refining reverse flotation, inhibitors and a calcium-magnesium mixed amine collector 2 are added to further remove calcium and magnesium impurities, improving concentrate purity. Through multi-stage separation and flotation processes, calcium and magnesium impurities are successfully removed, improving the grade and recovery rate of manganese concentrate and providing high-quality raw materials for subsequent leaching operations.

[0026] The X-ray intelligent sorting machine used in this embodiment of the invention has a conveyor belt bandwidth of 1.6m to 3.0m and a conveyor belt speed of 1m / s to 3m / s.

[0027] The chemical composition of the rhodochrosite used in the method provided by this invention includes: Mn 20.00wt%~33.00wt%, MgO 3.00wt%~13.00wt%, and CaO 4.00wt%~15.00wt%.

[0028] In the method provided by this invention, the pulp conditioning time during the first stage of rough reverse flotation is 2 min to 4 min.

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1:

[0031] A highly efficient method for removing impurities and purifying high-calcium, high-magnesium rhodochrosite includes the following steps:

[0032] In this embodiment, the rhodochrosite comes from Xinjiang, with a Mn content of 30.53 wt%, an MgO content of 5.68 wt%, and a CaO content of 7.44 wt%.

[0033] 1. Feed rhodochrosite into a coarse crusher to crush it into a crushed product with a particle size of less than 120mm.

[0034] 2. The crushed product is transported by conveyor belt to an X-ray intelligent separator for sorting to obtain sorted concentrate and sorted tailings.

[0035] 3. Grind the sorted concentrate to a particle size of less than 0.5 mm to obtain a ground sample, in which -0.074 mm mineral powder accounts for 85% of the total mass of the sorted concentrate.

[0036] 4. The crushed and ground product is fed into a vertical ring high-intensity magnetic separator with a magnetic field strength of 14000 Oe to obtain magnetic concentrate and magnetic tailings.

[0037] 5. Add 2% sodium carbonate solution to the magnetically separated manganese concentrate and adjust the slurry at room temperature until pH=9 and the slurry concentration is 30%. Then add 650g / t silicate ether amine collector 1 for 3min and perform reverse flotation. After skimming the froth for 6min, the froth product obtained is the first-stage rough reverse flotation tailings and the product in the tank is the first-stage rough reverse flotation concentrate.

[0038] 6. The primary roughing reverse flotation concentrate is added to a mixed inhibitor (dextrin:carboxymethyl cellulose = 2:1) at a ratio of 700 g / t, along with 750 g / t of a calcium-magnesium mixed amine collector. A secondary refining reverse flotation is then performed with a pulp concentration of 20%, a dosing time of 3 min, and a frothing time of 5 min. The resulting product, after drying, is the secondary refining reverse flotation concentrate, while the frothing product is the secondary refining reverse flotation tailings. The secondary refining reverse flotation concentrate is the final concentrate. The tailings from the separation, magnetic separation, primary roughing reverse flotation, and secondary refining reverse flotation are combined into the final tailings. The product is then dried to obtain manganese concentrate. The final manganese concentrate grade is 37.65 wt%; MgO content is 1.53 wt%; CaO content is 1.89 wt%; manganese recovery rate is 84.84%; CaO removal rate is 82.53%; and MgO removal rate is 81.46%.

[0039] Table 1. Mineral processing results of Example 1;

[0040] ;

[0041] Example 2:

[0042] The rhodochrosite has a Mn content of 26.24 wt%, an MgO content of 9.88 wt%, and a CaO content of 7.63 wt%.

[0043] 1. Feed rhodochrosite into a coarse crusher to crush it into a crushed product with a particle size of less than 120mm.

[0044] 2. The crushed products are conveyed to an X-ray intelligent separator for sorting to obtain sorted concentrate and sorted tailings.

[0045] 3. Grind the sorted concentrate to a particle size of less than 0.5 mm to obtain a ground sample, in which -0.074 mm mineral powder accounts for 80% of the total mass of the sorted concentrate.

[0046] 4. The crushed and ground product is fed into a vertical ring high-intensity magnetic separator with a magnetic field strength of 14000 Oe to obtain magnetic concentrate and magnetic tailings.

[0047] 5. Add 2% sodium carbonate solution to the magnetically separated manganese concentrate and adjust the slurry at room temperature until the pH is 10 and the slurry concentration is 30%. Then add 1400g / t silicate ether amine collector 1 for 3 minutes and perform reverse flotation. After skimming the froth for 6 minutes, the froth product obtained is the first-stage rough reverse flotation tailings, and the product obtained in the tank is the first-stage rough reverse flotation concentrate.

[0048] 6. The rougher reverse flotation concentrate from the first stage is added to a mixed inhibitor (dextrin:carboxymethyl cellulose = 3:1) at a ratio of 600 g / t, and a calcium-magnesium mixed amine collector at a ratio of 800 g / t for a second stage of cleaning reverse flotation. The pulp concentration is 20%, the dosing time is 3 min, and the flotation skimming time is 5 min. The resulting product is dried and becomes the second-stage cleaning reverse flotation concentrate. The frothy product is the second-stage cleaning reverse flotation tailings. The second-stage cleaning reverse flotation concentrate is the final concentrate. The separation tailings, magnetic separation tailings, first-stage rougher reverse flotation tailings, and second-stage cleaning reverse flotation tailings are combined into the final tailings. The product in the tank is dried to obtain manganese concentrate. The final manganese concentrate grade is 35.10 wt%; MgO content is 1.91 wt%; CaO content is 1.24 wt%. The manganese concentrate recovery rate is 84.55%, the CaO removal rate is 89.73%, and the MgO removal rate is 87.77%.

[0049] Table 2. Mineral processing results of Example 2;

[0050] ;

[0051] Example 3:

[0052] The rhodochrosite has a Mn content of 31.14 wt%, an MgO content of 5.78 wt%, and a CaO content of 9.83 wt%.

[0053] 1. Feed rhodochrosite into a coarse crusher to crush it into a crushed product with a particle size of less than 120mm.

[0054] 2. The crushed product is transported by conveyor belt to an X-ray intelligent separator for sorting to obtain sorted concentrate and sorted tailings.

[0055] 3. Grind the sorted concentrate to a particle size of less than 0.5 mm to obtain a ground sample, in which -0.074 mm mineral powder accounts for 85% of the total mass of the sorted concentrate.

[0056] 4. The crushed and ground product is fed into a vertical ring high-intensity magnetic separator with a magnetic field strength of 14000 Oe to obtain magnetic concentrate and magnetic tailings.

[0057] 5. Add 2% sodium carbonate solution to the magnetically separated manganese concentrate and adjust the slurry at room temperature until the pH is 10 and the slurry concentration is 30%. Then add 700g / t silicate ether amine collector 1 for 3 minutes and perform reverse flotation. After skimming the froth for 6 minutes, the froth product obtained is the first-stage rough reverse flotation tailings, and the product obtained in the tank is the first-stage rough reverse flotation concentrate.

[0058] 6. The primary roughing reverse flotation concentrate is added to a mixed inhibitor (dextrin:carboxymethyl cellulose = 2:1) at a ratio of 720 g / t, along with 1000 g / t of a calcium-magnesium mixed amine collector for secondary refining reverse flotation. The pulp concentration is 20%, the dosing time is 3 min, and the flotation skimming time is 5 min. The resulting product in the tank, after drying, is the secondary refining reverse flotation concentrate, and the frothy product is the secondary refining reverse flotation tailings. The secondary refining reverse flotation concentrate is the final concentrate. The tailings from the separation, magnetic separation, primary roughing reverse flotation, and secondary refining reverse flotation are combined into the final tailings. The product in the tank is dried to obtain manganese concentrate. The final manganese concentrate grade is 37.56 wt%; MgO content is 0.78 wt%; CaO content is 2.51 wt%. The manganese concentrate recovery rate is 81.89%, the CaO removal rate is 82.67%, and the MgO removal rate is 90.84%.

[0059] Table 3. Mineral processing results of Example 3;

[0060] ;

[0061] Example 4:

[0062] The rhodochrosite has a Mn content of 29.61 wt%, an MgO content of 6.59 wt%, and a CaO content of 4.05 wt%.

[0063] 1. Feed rhodochrosite into a coarse crusher to crush it into a crushed product with a particle size of less than 120mm.

[0064] 2. The crushed product is transported by conveyor belt to an X-ray intelligent separator for sorting to obtain sorted concentrate and sorted tailings.

[0065] 3. The sorted concentrate is crushed and ground to a particle size of less than 0.5 mm to obtain a crushed sample, in which -0.074 mm mineral powder accounts for 85% of the total mass of the sorted concentrate.

[0066] 4. The crushed and ground product is fed into a vertical ring high-intensity magnetic separator with a magnetic field strength of 14000 Oe to obtain magnetic concentrate and magnetic tailings.

[0067] 5. Add 2% sodium carbonate solution to the magnetically separated manganese concentrate and adjust the slurry at room temperature until the pH is 9 and the slurry concentration is 35%. Then add 800g / t silicate ether amine collector 1 for 3 minutes and perform reverse flotation. After skimming the froth for 6 minutes, the froth product obtained is the first-stage rough reverse flotation tailings, and the product obtained in the tank is the first-stage rough reverse flotation concentrate.

[0068] 6. The primary roughing reverse flotation concentrate is added to a mixed inhibitor (dextrin:carboxymethyl cellulose = 5:2) at a ratio of 700 g / t, along with 600 g / t of a calcium-magnesium mixed amine collector for secondary refining reverse flotation. The pulp concentration is 25%, the dosing time is 3 min, and the flotation skimming time is 5 min. The resulting product in the tank, after drying, is the secondary refining reverse flotation concentrate, and the frothy product is the secondary refining reverse flotation tailings. The secondary refining reverse flotation concentrate is the final concentrate. The tailings from the separation, magnetic separation, primary roughing reverse flotation, and secondary refining reverse flotation are combined into the final tailings. The product in the tank is dried to obtain manganese concentrate. The final manganese concentrate grade is 36.11 wt%; MgO content is 1.22 wt%; CaO content is 1.02 wt%; manganese concentrate recovery rate is 81.90%; CaO removal rate is 83.08%; and MgO removal rate is 87.52%.

[0069] Table 4. Mineral processing results of Example 4;

[0070] ;

[0071] Example 5:

[0072] The rhodochrosite has a Mn content of 33.87 wt%, an MgO content of 3.56 wt%, and a CaO content of 8.44 wt%.

[0073] 1. Feed rhodochrosite into a coarse crusher to crush it into a crushed product with a particle size of less than 120mm.

[0074] 2. The crushed product is transported by conveyor belt to an X-ray intelligent separator for sorting to obtain sorted concentrate and sorted tailings.

[0075] 3. Grind the sorted concentrate to a particle size of less than 0.5 mm to obtain a ground sample, in which -0.074 mm mineral powder accounts for 85% of the total mass of the sorted concentrate.

[0076] 4. The crushed and ground product is fed into a vertical ring high-intensity magnetic separator with a magnetic field strength of 14000 Oe to obtain magnetic concentrate and magnetic tailings.

[0077] 5. Add 5% sodium carbonate solution to the magnetically separated manganese concentrate and adjust the slurry at room temperature until the pH is 12 and the slurry concentration is 34%. Then add 450g / t silicate ether amine collector 1 for 3 minutes and perform reverse flotation. After skimming the froth for 6 minutes, the froth product obtained is the first-stage rough reverse flotation tailings, and the product obtained in the tank is the first-stage rough reverse flotation concentrate.

[0078] 6. The primary roughing reverse flotation concentrate is added to a mixed inhibitor (dextrin:carboxymethyl cellulose = 3:1) at a ratio of 800 g / t, and a calcium-magnesium mixed amine collector at a ratio of 850 g / t for secondary refining reverse flotation. The pulp concentration is 25%, the dosing time is 3 min, and the flotation skimming time is 5 min. The product obtained in the tank, after drying, is the secondary refining reverse flotation concentrate, and the frothy product is the secondary refining reverse flotation tailings. The secondary refining reverse flotation concentrate is the final concentrate. The separation tailings, magnetic separation tailings, primary roughing reverse flotation tailings, and secondary refining reverse flotation tailings are combined into the final tailings. The product in the tank is dried to obtain manganese concentrate. The final manganese concentrate grade is 40.12 wt%; MgO content is 0.76 wt%; CaO content is 1.56 wt%, manganese concentrate recovery rate is 79.21%, CaO removal rate is 87.64%, and MgO removal rate is 85.73%.

[0079] Table 5. Mineral processing results of Example 5;

[0080] ;

[0081] Example 6:

[0082] The rhodochrosite has a Mn content of 25.51 wt%, an MgO content of 6.64 wt%, and a CaO content of 11.69 wt%.

[0083] 1. Feed rhodochrosite into a coarse crusher to crush it into a crushed product with a particle size of less than 120mm.

[0084] 2. The crushed product is transported by conveyor belt to an X-ray intelligent separator for separation to obtain separated concentrate and pre-selected tailings.

[0085] 3. Grind the sorted concentrate to a particle size of less than 0.5 mm to obtain a ground sample, in which -0.074 mm mineral powder accounts for 85% of the total mass of the sorted concentrate.

[0086] 4. The crushed and ground product is fed into a vertical ring high-intensity magnetic separator with a magnetic field strength of 14000 Oe to obtain magnetic concentrate and magnetic tailings.

[0087] 5. Add 1% sodium carbonate solution to the magnetically separated manganese concentrate and adjust the slurry at room temperature until the pH is 8 and the slurry concentration is 20%. Then add 820g / t silicate ether amine collector 1 for 3 minutes and perform reverse flotation. After skimming the froth for 6 minutes, the froth product obtained is the first-stage rough reverse flotation tailings, and the product obtained in the tank is the first-stage rough reverse flotation concentrate.

[0088] 6. The primary roughing reverse flotation concentrate is added to a mixed inhibitor (dextrin:carboxymethyl cellulose = 2:1) at a ratio of 600 g / t, along with 1300 g / t of a calcium-magnesium mixed amine collector for secondary refining reverse flotation. The pulp concentration is 15%, the dosing time is 3 min, and the flotation skimming time is 5 min. The resulting product in the tank, after drying, is the secondary refining reverse flotation concentrate, and the frothy product is the secondary refining reverse flotation tailings. The secondary refining reverse flotation concentrate is the final concentrate. The tailings from the separation, magnetic separation, primary roughing reverse flotation, and secondary refining reverse flotation are combined into the final tailings. The product in the tank is dried to obtain manganese concentrate. The final manganese concentrate grade is 33.61 wt%; MgO content is 1.78 wt%; CaO content is 2.68 wt%, manganese concentrate recovery rate is 86.05%, CaO removal rate is 85.02%, and MgO removal rate is 82.48%.

[0089] Table 6. Mineral processing results of Example 6;

[0090]

Claims

1. A method for pre-tailings removal and flotation deep purification of high-calcium magnesium rhodochrosite, characterized in that, Includes the following steps: Step 1: Crush rhodochrosite to a particle size ≤130mm to obtain the crushed product; Step 2: The crushed product is conveyed to the separator via a conveyor belt for separation to obtain X-ray intelligent separation concentrate and separation tailings; Step 3: Grind the sorted concentrate to a particle size ≤0.5mm to obtain the crushed product; Step 4: Perform high-intensity magnetic separation on the crushed and ground products to obtain magnetically separated manganese concentrate and magnetically separated tailings; Step 5: Add the magnetically separated manganese concentrate to the sodium carbonate solution for slurry preparation, then add amine collector 1, mix evenly, and perform reverse flotation to obtain the product in the tank as the first-stage rough reverse flotation concentrate, and the froth product as the first-stage rough reverse flotation tailings. Step 6: Add inhibitor and collector 2 to the first stage rough reverse flotation concentrate and perform 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 separation tailings, magnetic separation tailings, first stage rough reverse flotation tailings and second stage fine reverse flotation tailings are combined into the final tailings; In step 5, amine collector 1 is a silicate ether amine collector; the addition time of amine collector 1 is 3min-5min, and the addition amount is 200g / t~2000g / t based on rhodochrosite; During reverse flotation, the time for skimming bubbles is 3-8 minutes; In step 6, amine collector 2 is a calcium-magnesium mixed amine collector; based on rhodochrosite, the amount of inhibitor added is 50g / t~800g / t, and the amount of amine collector 2 added is 200g / t~1500g / t; The addition time of amine collector 2 is 3-5 minutes, and the slurry mass concentration is 10%-30%; During the reverse flotation process, the time for skimming bubbles is 3-6 minutes.

2. The method for pre-tailings removal and flotation deep 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%~33.00wt%, MgO 3.00wt%~13.00wt%, and CaO 4.00wt%~15.00wt%.

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

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

5. The method for pre-tailings removal and flotation deep 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 6000 Oe to 20000 Oe.

6. The method for pre-tailings removal-flotation deep purification of high-calcium magnesium rhodochrosite according to claim 1, characterized in that, In step 5, the sodium carbonate solution has a mass concentration of 1% to 5%, the slurry preparation time is 2 min to 4 min, and the pH of the product obtained after slurry preparation is 8.0 to 12.

0. During the first stage of rough reverse flotation, the pulp temperature is room temperature and the pulp mass concentration is 20%~40%.

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

8. The method for pre-tailings removal and flotation deep 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 as follows: the product in the tank is dried to obtain manganese concentrate.

Images