Method for enriching molybdenum oxide in molybdenum-containing mineral

Abstract

The invention relates to a method for enriching molybdenum oxide in molybdenum-containing minerals. A method for enriching molybdenum oxide in molybdenum-containing minerals comprises the following steps that magnetic separation tailings serve as treatment objects, ore grinding is carried out, the molybdenum-containing minerals and gangue minerals are in a dissociation state, filtering and drying are carried out after ore grinding, and non-magnetic floating feed ores are obtained; roughing is conducted, specifically, the non-magnetic flotation feed ore is made into ore pulp, the ore pulp is evenly stirred, an inhibitor, a collecting agent and a foaming agent are sequentially added, primary flotation separation is conducted, and roughed concentrate is obtained; fine selection is conducted, specifically, after the roughing concentrate is stirred, secondary flotation separation is conducted; and repeating the concentration step until the target yield is reached, and completing the operation to obtain the molybdenum oxide mineral. The molybdenum grade of the tailings subjected to magnetic separation is 0.1-0.2%. And the fineness of the ground ore is 80%-95% of-325 meshes. The drying process is drying at the temperature of 60-90 DEG C. According to the method, efficient enrichment of the molybdenum-containing minerals is achieved, and the technological process is simple.

Description

Technical Field

[0001] The present invention belongs to the technical field of mineral separation, and in particular, relates to a method for enriching molybdenum oxide in molybdenum-containing minerals. Background Art

[0002] Affected by geological mineralization conditions, molybdenum exists in the earth's crust in two forms: sulfide and oxidation. At present, the industry mainly processes sulfide, i.e., molybdenite, and achieves efficient recovery through flotation process. The technology is relatively mature, but there is a lack of processing methods for oxidized molybdenum-containing minerals. For the widely existing oxygen-sulfur mixed ores, stockpiling is usually used due to the lack of processing methods for oxidized molybdenum-containing minerals.

[0003] At present, the main oxidized molybdenum-containing minerals in the ore are molybdenum calcium ore and molybdenum ore. The use of superconducting magnetic separation technology can achieve efficient enrichment of molybdenum-iron paragenetic minerals in the ore, but the magnetic separation tailings still contain about 30% of molybdenum-containing minerals. Process mineralogy shows that the main gangue minerals in the tailings of this mineral are oxidized molybdenum minerals such as molybdenum calcium ore and iron molybdenum ore. Since the magnetic separation tailings contain more clay minerals, it is difficult to achieve efficient separation by gravity separation. Only flotation can be used for separation. Analysis of domestic and foreign literature shows that there is little research on the flotation separation of oxidized molybdenum minerals, and there is no industrial application example.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a method for efficiently enriching molybdenum oxide in molybdenum-containing minerals, solve the problem of efficient flotation recovery of molybdenum-containing oxide ores, and lay a technical foundation for the efficient utilization of related minerals.

[0006] To achieve the above object, the present invention particularly adopts the following technical solutions:

[0007] A method for enriching molybdenum oxide in a molybdenum-containing mineral comprises the following steps:

[0008] Magnetic separation of tailings, grinding, so that the molybdenum-containing minerals and gangue minerals reach a dissociated state, after grinding, filtering, drying, to obtain non-magnetic flotation ore;

[0009] Roughing, making the non-magnetic flotation ore into pulp, adding inhibitor, stirring evenly, adding collector and frother in sequence, performing the first flotation separation, and obtaining roughing concentrate;

[0010] Cleaning, without adding flotation reagents, stirring the roughing concentrate and performing a second flotation separation;

[0011] Repeat the concentration steps until the target yield is reached, the operation is completed, and molybdenum oxide minerals are obtained.

[0012] Furthermore, the molybdenum grade of the tailings after magnetic separation is 0.1-0.2%.

[0013] Furthermore, the grinding fineness is -325 mesh 80% to 95%.

[0014] Furthermore, the drying process is drying at 60-90°C.

[0015] Furthermore, the slurry concentration is 30% to 45%.

[0016] Furthermore, the inhibitor is water glass, and the dosage is 500-3500 g / t.

[0017] Furthermore, the collector is oxidized paraffin soap, and the dosage is 500-1500 g / t.

[0018] Furthermore, the concentrate is stirred for 5 to 10 minutes.

[0019] Furthermore, the scraping time of the second flotation separation is 5 to 10 minutes.

[0020] Furthermore, the selection step is repeated 1 to 3 times.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] Highly selective enrichment of molybdenum oxide ore is a difficult problem in the field of mineral processing. The present invention adopts a flotation process, selects highly efficient collectors and inhibitors in the roughing process, and does not add flotation agents in the fine process, thereby achieving efficient enrichment of molybdenum-containing minerals with a simple process flow. The method of the present invention has low production cost, makes full use of resources, and has no significant impact on the environment. The present invention can provide technical support for the highly selective recovery of molybdenum oxide minerals and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the flotation flow chart of molybdenum oxide ore in Example 1.

[0024] Figure 2 This is the flotation flow chart of molybdenum oxide mineral in Example 2. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below. The following embodiments are part of the embodiments of the present invention, rather than all embodiments. The embodiments described below are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention. For those who do not specify specific conditions in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer.

[0026] A method for enriching molybdenum oxide in a molybdenum-containing mineral comprises the following steps:

[0027] (1) Magnetic separation of tailings, the tailings after magnetic separation have a particle size of 300-1000 μm and a molybdenum grade of 0.1-0.2%. Grinding, according to the difference in particle size composition in the tailings, the grinding time is controlled to be 5-15 min, and the grinding fineness is -325 mesh 80%-95%, so that the molybdenum-containing minerals and gangue minerals reach a dissociated state, achieving efficient dissociation of useful minerals and improving the uniformity of fine-grained product particle size distribution. After grinding, the ore is filtered and dried at 60-90°C to obtain non-magnetic flotation ore.

[0028] (2) Roughing: non-magnetic raw ore is made into pulp with a pulp concentration of 25% to 35%. Too high a concentration is not conducive to pulp dispersion and affects the flotation effect. Too low a concentration affects the processing capacity. The pH is neutral. Add inhibitor water glass in an amount of 500 to 3500 g / t. Stir evenly and add a collector in an amount of 500 to 1500 g / t. Then add a frother. Perform the first flotation separation to obtain a roughing concentrate.

[0029] (3) Concentration: After stirring the rough concentrate for 5 to 10 minutes, a second flotation separation is carried out without adding flotation agents, and the scraping time is 5 to 10 minutes.

[0030] (4) Repeat the flotation step, preferably for 5 minutes each time, until the target yield is reached, the operation is completed, and the molybdenum oxide mineral is obtained. According to the method of the present invention, the flotation step is repeated 1 to 3 times to achieve the index of molybdenum enrichment ratio of 3 to 5 in the concentrate, thereby realizing efficient enrichment of molybdenum-containing minerals.

[0031] Example 1

[0032] The ore sample of this embodiment is a low-grade uranium-molybdenum ore in Hebei.

[0033] A method for enriching molybdenum oxide in a molybdenum-containing mineral, such as Figure 1 As shown, the following steps are included:

[0034] (1) Superconducting magnetic separation tailings, tailings particle size is -500μm, molybdenum grade is 0.17%. Ball mill is used for grinding, grinding time is 5min, grinding fineness is -325 mesh 80%, so that molybdenum-containing minerals and gangue minerals reach a dissociation state, realize efficient dissociation of useful minerals, and improve the uniformity of fine-grained product particle size distribution. After grinding, filter and set the oven temperature to 60℃ for drying to obtain 0.5kg of non-magnetic flotation ore.

[0035] (2) Roughing: add water to the non-magnetic raw ore to make pulp, the pulp concentration is 30%, and the pH is neutral. Use a hanging trough flotation machine with a speed of 1200r / min. After adding materials according to the pulp concentration, turn on the flotation machine and stir the pulp for 5 minutes to ensure that the ore sample is fully dispersed in the flotation tank. Add water glass in an amount of 1000g / t and stir for 3 minutes. Add oxidized paraffin soap in an amount of 1000g / t, and then add a frother. Perform the first flotation separation with a scraping time of 10 minutes to obtain a concentrate.

[0036] (3) Concentration: select a flotation tank of appropriate volume according to the concentrate output. Stir the concentrate for 5 minutes and then perform the second flotation separation without adding flotation reagents. The scraping time is 5 minutes.

[0037] (4) Repeat the flotation step twice, the flotation time is 5 minutes, and the operation is completed to obtain molybdenum oxide mineral. The obtained molybdenum oxide mineral is tested, and the results are shown in Table 1.

[0038] Table 1

[0039]

[0040] From the test results in Table 1, it can be seen that the Mo grade of the flotation concentrate is 0.68%, the recovery rate is 21.39%, and the enrichment ratio is 4, indicating that the flotation process of this embodiment achieves high-selective recovery of molybdenum-containing oxide minerals in the magnetic separation tailings.

[0041] Example 2

[0042] The ore sample of this embodiment is a low-grade uranium-molybdenum ore in Hebei.

[0043] A method for enriching molybdenum oxide in a molybdenum-containing mineral, such as Figure 2 As shown, the following steps are included:

[0044] (1) Superconducting magnetic separation tailings, tailings particle size is -500μm, molybdenum grade is 0.17%. Ball mill is used for grinding, grinding time is 5min, grinding fineness is -325 mesh 80%, so that molybdenum-containing minerals and gangue minerals reach a dissociation state, realize efficient dissociation of useful minerals, and improve the uniformity of fine-grained product particle size distribution. After grinding, filter and set the oven temperature to 90℃ for drying to obtain 0.5kg of non-magnetic flotation ore.

[0045] (2) Roughing: add water to the non-magnetic raw ore to make pulp, the pulp concentration is 45%, and the pH is neutral. Use a hanging trough flotation machine with a speed of 1200r / min. After adding materials according to the pulp concentration, turn on the flotation machine and stir the pulp for 5 minutes to ensure that the ore sample is fully dispersed in the flotation tank. Add water glass in an amount of 3000g / t. Stir for 3 minutes. Add oxidized paraffin soap in an amount of 1000g / t, and then add a frother. Perform the first flotation separation with a scraping time of 10 minutes to obtain a concentrate.

[0046] (3) Concentration: select a flotation tank of appropriate volume according to the concentrate output. Stir the concentrate for 5 minutes and then perform the second flotation separation without adding flotation reagents. The scraping time is 5 minutes.

[0047] (4) Repeat the flotation step for 5 minutes to complete the operation and obtain molybdenum oxide mineral. The obtained molybdenum oxide mineral was tested and the results are shown in Table 2.

[0048] Table 2

[0049]

[0050] From the test results in Table 2, it can be seen that the Mo grade in the concentrate is increased to 0.74%, the Mo operating recovery rate is 19.01%, and the total recovery rate is 5.76%, indicating that increasing the amount of inhibitor can improve the selectivity of useful minerals.

[0051] Comparative Example

[0052] The ore sample of this comparative example is the same as that of Example 1.

[0053] (1) The grinding fineness is -325 mesh 90%, and the rest of the process is the same as step (1) of Example 1.

[0054] (2) to (4) are the same as steps (2) to (4) of Example 1, except that the flotation collector is benzohydroxamic acid, with an amount of 1000 g / t. The obtained molybdenum oxide mineral was tested, and the results are shown in Table 3.

[0055] Table 3

[0056]

[0057] Comparing the test results in Table 3 with those in Table 1, it can be seen that the process and collector designed for the flotation of molybdenum oxide minerals in the present invention have obvious advantages.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for enriching molybdenum oxide in molybdenum-containing minerals, characterized in that: The steps include: Magnetic separation of tailings, grinding, so that the molybdenum-containing minerals and gangue minerals reach a dissociated state, after grinding, filtering, drying, to obtain non-magnetic flotation ore; Roughing, making the non-magnetic flotation ore into pulp, adding inhibitor, stirring evenly, adding collector and frother in sequence, performing the first flotation separation, and obtaining roughing concentrate; Cleaning, without adding flotation reagents, stirring the roughing concentrate and performing a second flotation separation; Repeat the concentration steps until the target yield is reached, the operation is completed, and molybdenum oxide concentrate is obtained.

2. The method for enriching molybdenum oxide in molybdenum-containing minerals according to claim 1, characterized in that: The molybdenum grade of the tailings after magnetic separation is 0.1-0.2%.

3. The method for enriching molybdenum oxide in molybdenum-containing minerals according to claim 1, characterized in that: The grinding fineness is -325 mesh 80% to 95%.

4. The method for enriching molybdenum oxide in molybdenum-containing minerals according to claim 1, characterized in that: The drying process is drying at 60-90°C.

5. The method for enriching molybdenum oxide in molybdenum-containing minerals according to claim 1, characterized in that: The slurry concentration is 30% to 45%.

6. The method for enriching molybdenum oxide in molybdenum-containing minerals according to claim 1, characterized in that: The inhibitor is water glass, and the dosage is 500-3500g / t.

7. The method for enriching molybdenum oxide in molybdenum-containing minerals according to claim 1, characterized in that: The collector is oxidized paraffin soap, and the dosage is 500-1500g / t.

8. The method for enriching molybdenum oxide in molybdenum-containing minerals according to claim 1, characterized in that: The concentrate is stirred for 5 to 10 minutes.

9. The method for enriching molybdenum oxide in molybdenum-containing minerals according to claim 1, characterized in that: The scraping time of the second flotation separation is 5 to 10 minutes.

10. The method for enriching molybdenum oxide in molybdenum-containing minerals according to claim 1, characterized in that: Repeat the selection steps 1 to 3 times.

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