A flotation reagent for inhibiting calcite in fluorite-barite intergrowth ore

Abstract

The present application belongs to the technical field of mineral processing. The present application provides a flotation reagent for inhibiting calcite in fluorite-barite intergrowth ore, which comprises a collector and an inhibitor; the collector comprises at least one of sodium oleate and oxidized paraffin soap; the inhibitor comprises 5-mononitrate isosorbide and water glass in a weight ratio of 4-5:1. The present application also provides a corresponding flotation method, which comprises the steps of: preparing fluorite-barite intergrowth ore containing calcite into ore slurry, and then adding the collector and the inhibitor described in claim 1 or 2 to the obtained ore slurry for flotation. The present application can effectively inhibit calcite during the flotation of fluorite-barite intergrowth ore and improve the fluorite recovery rate, and the obtained CaF2 recovery rate is as high as 95% or more; the flotation reagent used in the present application has a small amount of use and low flotation cost.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology and relates to flotation reagents for fluorite-barite symbiotic minerals, specifically to a flotation reagent and method for inhibiting calcite in fluorite-barite symbiotic minerals. Background Technology

[0002] Flotation is the most common beneficiation method for fluorite ore, and it is often able to separate high-quality fluorite ore. Currently, many research institutions both domestically and internationally have largely solved the problem of developing and utilizing single-type fluorite deposits. The next stage of comprehensive fluorite resource recovery hinges on the development and utilization of associated and co-existing fluorite deposits. This particular ore mainly contains fluorite and barite, with calcite as the main gangue mineral. The combined content of these three minerals exceeds 95%, making it a typical fluorite-barite co-existing ore.

[0003] Currently, the beneficiation effect of fluorite-barite coexisting ores, especially fluorite-barite coexisting ores containing calcite, is not ideal. The main drawback is that the flotation process is too long and too much reagent is used. Usually, multiple beneficiation processes and a large amount of reagent are required to obtain a good flotation effect.

[0004] Therefore, finding a flotation reagent and method that can be used for fluorite-barite symbiotic minerals containing calcite, avoids excessive reagent usage, and has a short flotation process is urgently needed in this field. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a flotation reagent that can effectively suppress calcite, improve fluorite recovery rate and grade, and reduce reagent usage.

[0006] To achieve the above objectives, the present invention provides a flotation reagent for inhibiting calcite in fluorite-barite symbiotic ores, the flotation reagent comprising a collector and a depressant; the collector comprising at least one of sodium oleate and oxidized paraffin soap; the depressant comprising isosorbide 5-mononitrate and water glass in a weight ratio of 4 to 5:1.

[0007] Preferably, the collector is sodium oleate; the inhibitor, by weight ratio 9:2, is composed of isosorbide 5-mononitrate and water glass.

[0008] In this invention, the collector used is a commonly used collector for fluorite beneficiation, which is inexpensive and readily available. The core of this invention lies in the development of a novel inhibitor. This inhibitor, when used in conjunction with the conventional collector described in this invention, can achieve a very high CaF2 recovery rate, exceeding 95%, while also requiring a relatively low dosage.

[0009] In the inhibitors of this invention, water glass has been used in the beneficiation of other minerals, but its effect as an inhibitor is relatively limited for fluorite-barite symbiotic minerals containing calcite.

[0010] To the inventor's knowledge, this invention is the first application of isosorbide-5-mononitrate in mineral processing. However, when used alone as an inhibitor, isosorbide-5-mononitrate is ineffective; it needs to be combined with water glass in a specific ratio to achieve better mineral processing results. Related experiments and comparative examples can be found in this section. Furthermore, industrial-grade isosorbide-5-mononitrate is relatively inexpensive, generally around 1 yuan / kg, making it suitable for mineral processing.

[0011] The present invention also provides a flotation method for inhibiting calcite in fluorite-barite symbiotic ores based on the above-mentioned flotation reagents. The flotation method includes the steps of: preparing a slurry of fluorite-barite symbiotic ores containing calcite, and then adding the collector and inhibitor described in claim 1 or 2 to the obtained slurry for flotation.

[0012] Optionally, when preparing a slurry from a fluorite-barite symbiotic mineral containing calcite, the slurry concentration is 25–30 w / w.

[0013] Preferably, when preparing the fluorite-barite symbiotic mineral containing calcite into a slurry, it is first ground with a ball mill to a powder of -0.074 mm, which accounts for at least 50%.

[0014] Generally, flotation involves roughing, scavenging, and cleaning.

[0015] Preferably, the coarse selection is performed once, the sweep selection is performed twice, and the fine selection is performed twice.

[0016] Preferably, during rough selection, the amount of collector is 200 g / t and the amount of inhibitor is 80 g / t.

[0017] Preferably, when performing scavenging, the amount of inhibitor used is 40g / t for every 100g / t.

[0018] Preferably, during the selection process, the dosage of the inhibitor is 80g / t, which is 200g / t.

[0019] The beneficial effects of this invention are:

[0020] This invention can effectively suppress calcite and improve the fluorite recovery rate when flotating fluorite-barite symbiotic minerals, with the CaF2 recovery rate reaching over 95%. The flotation reagents used in this invention are used in small quantities, resulting in low flotation costs. Detailed Implementation

[0021] The present invention will be specifically described below through embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above-described invention are still within the scope of protection of the present invention.

[0022] The minerals used in the following examples and comparative examples are from the same source: fluorite-barite symbiotic minerals containing calcite, referred to as the raw ore. The minerals consist of 33.7% fluorite, 46.4% barite, and 15.13% calcite, with a total content exceeding 95%. The remaining minerals include small amounts of dolomite, mica, quartz, olivine, feldspar, etc., each not exceeding 1%.

[0023] Example 1

[0024] (1) Add water to the raw ore and put it into a ball mill for ball milling so that the -0.074mm powder accounts for 86.3%.

[0025] (2) Place the product obtained in step (1) into a flotation cell and adjust the pulp concentration to 28%.

[0026] (3) Under natural pH conditions, a collector and an inhibitor are added to step (2), and a roughing is performed once and a scavenging is performed twice to obtain a rough concentrate. Then, a fine cleaning is performed twice to obtain a fluorite concentrate.

[0027] The collector used is sodium oleate, with a usage of 200 g / t in roughing and cleaning and 100 g / t in scavenging; the inhibitor, based on a weight ratio of 9:2, is composed of isosorbide 5-mononitrate and water glass, with a usage of 40 g / t in roughing and cleaning and 40 g / t in scavenging.

[0028] Example 2

[0029] (1) Add water to the raw ore and put it into a ball mill for ball milling so that the -0.074mm powder accounts for 50.2%.

[0030] (2) Place the product obtained in step (1) into a flotation cell and adjust the pulp concentration to 30%.

[0031] (3) Under natural pH conditions, a collector and an inhibitor are added to step (2), and a roughing is performed once and a scavenging is performed twice to obtain a rough concentrate. Then, a fine cleaning is performed twice to obtain a fluorite concentrate.

[0032] The collector used is oxidized paraffin soap, with a usage of 200 g / t in roughing and cleaning and 100 g / t in scavenging; the inhibitor is composed of isosorbide 5-mononitrate and water glass in a weight ratio of 4:1, with a usage of 40 g / t in roughing and cleaning and 40 g / t in scavenging.

[0033] Example 3

[0034] (1) Add water to the raw ore and put it into a ball mill for ball milling so that the -0.074mm powder accounts for 76.7%.

[0035] (2) Place the product obtained in step (1) into a flotation cell and adjust the pulp concentration to 25%.

[0036] (3) Under natural pH conditions, a collector and an inhibitor are added to step (2), and a roughing is performed once and a scavenging is performed twice to obtain a rough concentrate. Then, a fine cleaning is performed twice to obtain a fluorite concentrate.

[0037] The collector used is sodium oleate, with a usage of 200 g / t in roughing and cleaning and 100 g / t in scavenging. The inhibitor, based on a weight ratio of 5:1, is composed of isosorbide 5-mononitrate and water glass, with a usage of 40 g / t in roughing and cleaning and 40 g / t in scavenging.

[0038] Comparative Example 1

[0039] Except for replacing the inhibitor with water glass alone, it is identical to Example 1.

[0040] Comparative Example 2

[0041] Except for replacing the inhibitor with isosorbide mononitrate alone, the rest is the same as in Example 1.

[0042] Comparative Example 3

[0043] Except for adjusting the weight ratio of isosorbide mononitrate to water glass to 8:1, everything else is the same as in Example 1.

[0044] Comparative Example 4

[0045] Except for adjusting the weight ratio of isosorbide mononitrate to water glass to 2:1, everything else is the same as in Example 1.

[0046] Experimental Example

[0047] The flotation effect of Examples 1-3 and Comparative Examples 1-4 was tested, and the yield of fluorite concentrate, CaF2 grade and CaF2 recovery rate were tested. The results are shown in Table 1.

[0048] Table 1

[0049]

Claims

1. A flotation reagent for inhibiting calcite in fluorite-barite symbiotic ores, characterized in that, The flotation reagents include a collector and a depressant; the collector includes at least one of sodium oleate and oxidized paraffin soap; the depressant, in a weight ratio of 4 to 5:1, includes isosorbide 5-mononitrate and water glass.

2. The flotation reagent according to claim 1, characterized in that, The collector is sodium oleate; the inhibitor, by weight ratio 9:2, is composed of isosorbide mononitrate and water glass.

3. A flotation method for suppressing calcite in fluorite-barite symbiotic ores, characterized in that, The flotation method includes the steps of: preparing a slurry from a fluorite-barite symbiotic mineral containing calcite, and then adding the collector and inhibitor described in claim 1 or 2 to the obtained slurry for flotation.

4. The flotation method according to claim 3, characterized in that, When preparing a slurry from a fluorite-barite symbiotic mineral containing calcite, the slurry concentration is 25–30 w / w.

5. The flotation method according to claim 4, characterized in that, When preparing a slurry from a fluorite-barite symbiotic mineral containing calcite, the material should first be ground in a ball mill to a powder of at least -0.074 mm, which should account for at least 50%.

6. The flotation method according to claim 4, characterized in that, During flotation, roughing, sweeping, and cleaning are performed.

7. The flotation method according to claim 6, characterized in that, The number of rough selections is 1, the number of scan selections is 2, and the number of fine selections is 2.

8. The flotation method according to claim 7, characterized in that, During the roughing process, the amount of collector used is 200 g / t, and the amount of inhibitor used is 80 g / t.

9. The flotation method according to claim 8, characterized in that, When performing scavenging, the dosage is 100g / t, and the amount of inhibitor is 40g / t.

10. The flotation method according to claim 9, characterized in that, When selecting the finest ingredients, the dosage is 200g / t, and the dosage of the inhibitor is 80g / t.

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