Flotation process capable of protecting large graphite flakes

Abstract

The invention discloses a flotation process capable of protecting large graphite flakes, which specifically comprises the following steps: S1, carrying out water quenching treatment on a raw material large-flake graphite ore, then carrying out crushing treatment through crushing equipment, sieving through a 50-100-mesh sieve, and then sequentially carrying out ball milling and flotation treatment on the crushed graphite ore to obtain crude ore and tailings; the invention relates to the technical field of inorganic non-metallic materials. According to the flotation process capable of protecting the large flake graphite, the flotation efficiency of the large flake graphite can be greatly improved by simplifying the flotation method of the large flake graphite, and the purpose of protecting the large flake graphite by firstly carrying out water quenching treatment on the raw materials is well achieved; the large crystalline flake graphite flotation method can be simplified, large crystalline flake graphite protection treatment can be completed, and therefore large crystalline flake graphite flotation work is very beneficial.

Description

Technical Field

[0001] The present invention relates to the technical field of inorganic non-metallic materials, and particularly to a flotation process for protecting large graphite flakes. Background Art

[0002] Graphite is a non-metallic mineral material with stable properties and a lamellar structure, having characteristics such as corrosion resistance, high temperature resistance, thermal shock resistance, self-lubrication, heat conduction, and electrical conductivity. It is an essential key raw material in industries such as machinery, electronics, military, and aerospace. Large flake graphite has unique physical and chemical properties such as high temperature resistance, oxidation resistance, corrosion resistance, thermal shock resistance, high strength, good toughness, high self-lubrication strength, strong heat conduction, and electrical conductivity, and can be widely used in industries such as metallurgy, machinery, electronics, batteries, chemical industry, light industry, military, national defense, aerospace, and refractory materials. It is an important non-metallic raw material essential for current high-tech. Generally, the larger the scale of graphite products, the wider their applications and the higher their values. Currently, the price of graphite with a particle size greater than 0.15 mm is several times that of graphite with a particle size less than 0.15 mm. Graphite is generally obtained by crushing, grinding, and flotation of graphite ore. Since graphite ore contains a large amount of hard impurities such as quartz and feldspar, it will cause relatively serious damage to graphite flakes during the processing, making the final graphite product have smaller flakes, which restricts the improvement of graphite value. At present, there are few studies and applications on the protection and processing methods of large flake graphite. Basically, in the flotation process, methods such as shortening the grinding time and increasing the number of grinding stages are adopted, but the actual protection effect on large flake graphite is limited, and the process is cumbersome.

[0003] The current flotation method for large flake graphite is complex and cumbersome, and it causes damage to graphite. It cannot achieve greatly improving the flotation efficiency of large flake graphite by simplifying the flotation method, and cannot achieve the purpose of protecting large flake graphite by first performing water quenching treatment on the raw materials. It cannot simplify the flotation method of large flake graphite and complete the protection treatment of large flake graphite at the same time, which is very disadvantageous to the flotation work of large flake graphite. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the present invention provides a flotation process for protecting large graphite flakes, which solves the problems that the existing flotation method for large flake graphite is complex and cumbersome, causes damage to graphite, cannot achieve greatly improving the flotation efficiency of large flake graphite by simplifying the flotation method, cannot achieve the purpose of protecting large flake graphite by first performing water quenching treatment on the raw materials, and cannot simplify the flotation method of large flake graphite and complete the protection treatment of large flake graphite at the same time.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the present invention is realized through the following technical solutions: A flotation process for protecting large graphite flakes, specifically including the following steps:

[0008] S1. First, subject the raw large flake graphite ore to water quenching treatment, then perform crushing treatment through a crushing device, pass through a 50-100 mesh sieve, and then sequentially subject the crushed graphite ore to ball milling and flotation treatment to obtain rough ore and tailings;

[0009] S2. First, process the rough ore obtained in step S1 through a No. 1 mill, and then put it into a No. 1 flotation column for 3-5 times of quick selection and concentration. Each flotation is carried out for 4-8 hours to obtain graphite concentrate and middlings, and the middlings obtained after 3-5 times of concentration are combined;

[0010] S3. The graphite concentrate obtained in step S2 is subjected to more refined treatment through a No. 2 mill, and after being subjected to flotation treatment again through a No. 2 flotation column, large flake graphite ore is obtained.

[0011] Preferably, the tailings in step S1 are used to recover the graphite in the tailings through multiple flotation operations. After 2-3 times of scavenging, the recovered graphite ore is obtained. Scavenging is carried out by adding emulsified kerosene and frother to the tailings for treatment.

[0012] Preferably, the combined middlings in step S2 are sequentially concentrated and ball milled, emulsified kerosene and frother are added thereto for scavenging, and then sent to a flotation machine for concentration treatment to obtain concentrate and middlings. The obtained middlings are processed by repeating step S1.

[0013] Preferably, the flotation temperature in step S2 is 60-80 °C, and flotation is carried out for 2-4 hours to obtain flaky graphite flotation concentrate.

[0014] Preferably, the emulsifier is one of sodium stearate, sodium dodecyl sulfate or N-dodecyl dimethylamine.

[0015] Preferably, the frother is one of pine oil, eucalyptus oil, camphor oil or cresylic acid.

[0016] Preferably, the large flake graphite ore in step S1 is first calcined in an oxygen-free environment at a temperature of 700-900 °C for 20-40 minutes, and after the calcination is completed, it is directly put into water for cooling.

[0017] Preferably, the particle size after flotation in step S3 is 1-3 mm.

[0018] (III) Beneficial effects

[0019] The present invention provides a flotation process for protecting large graphite flakes. Compared with the prior art, it has the following beneficial effects: The flotation process for protecting large graphite flakes specifically includes the following steps: S1. First, subject the raw large flake graphite ore to water quenching treatment, then perform crushing treatment through a crushing device, screen it through a 50-100 mesh screen, and then sequentially subject the crushed graphite ore to ball milling and flotation treatment to obtain crude ore and tailings; S2. First, process the crude ore obtained in step S1 through a No. 1 mill, and then put it into a No. 1 flotation column for 3-5 times of quick selection and concentration. Each flotation lasts for 4-8 hours to obtain graphite concentrate and middlings, and combine the middlings obtained after 3-5 times of concentration; S3. The graphite concentrate obtained in step S2 is subjected to more refined treatment through a No. 2 mill, and then subjected to flotation treatment through a No. 2 flotation column to obtain large flake graphite ore. It can achieve greatly improving the flotation efficiency of large flake graphite by simplifying the large flake graphite flotation method, and can well achieve the purpose of protecting the large flake graphite by first subjecting the raw material to water quenching treatment, and can achieve both simplifying the large flake graphite flotation method and completing the protection treatment of the large flake graphite, which is very beneficial to the large flake graphite flotation work. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a flowchart of the flotation process of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figure 1 , the embodiments of the present invention provide five technical solutions: A flotation process for protecting large graphite flakes specifically includes the following embodiments:

[0023] Embodiment 1: A flotation process for protecting large graphite flakes specifically includes the following steps:

[0024] S1. First, subject the raw large flake graphite ore to water quenching treatment, then perform crushing treatment through a crushing device, screen it through a 75 mesh screen, and then sequentially subject the crushed graphite ore to ball milling and flotation treatment to obtain crude ore and tailings. The tailings are recycled for the graphite in the tailings through multiple flotations, and the recycled graphite ore is obtained after 2 scavenging operations. The scavenging is to add emulsified kerosene and a foaming agent to the tailings for treatment. The large flake graphite ore is first calcined in an oxygen-free environment at a temperature of 800 °C for 30 minutes, and after the calcination is completed, it is directly put into water for cooling;

[0025] S2. First, the crude ore obtained in step S1 is processed by a No. 1 mill, and then fed into a No. 1 flotation column for 4 times of quick-selection and concentration. Each flotation lasts for 6 hours to obtain graphite concentrate and middlings. The middlings obtained after 4 times of concentration are combined. The combined middlings are concentrated and ball-milled in sequence. After adding emulsified kerosene and frother, scavenging is carried out, and then it is sent into a flotation machine again for concentration treatment to obtain concentrate and middlings. The obtained middlings are processed by repeating step S1. Under the condition that the flotation temperature is 70 °C, flotation is carried out for 3 hours to obtain flaky graphite flotation concentrate. The emulsifier is sodium stearate, and the frother is pine oil;

[0026] S3. The graphite concentrate obtained in step S2 is processed more finely by a No. 2 mill, and then undergoes flotation treatment again by a No. 2 flotation column to obtain large flake graphite ore, and the particle size after flotation is 2 mm.

[0027] Example 2: A flotation process for protecting large flakes of graphite specifically includes the following steps:

[0028] S1. First, the raw large flake graphite ore is quenched with water, then crushed by a crushing device, passed through a 50-mesh sieve, and then the crushed graphite ore is ball-milled and flotated in sequence to obtain crude ore and tailings. The tailings are recycled for the graphite in the tailings through multiple flotations. After 3 times of scavenging, the recycled graphite ore is obtained. Scavenging is carried out by adding emulsified kerosene and frother to the tailings. The large flake graphite ore is first calcined in an oxygen-free environment at a temperature of 700 °C for 20 minutes, and after calcination is completed, it is directly put into water for cooling;

[0029] S2. First, the crude ore obtained in step S1 is processed by a No. 1 mill, and then fed into a No. 1 flotation column for 3 times of quick-selection and concentration. Each flotation lasts for 4 hours to obtain graphite concentrate and middlings. The middlings obtained after 3 times of concentration are combined. The combined middlings are concentrated and ball-milled in sequence. After adding emulsified kerosene and frother, scavenging is carried out, and then it is sent into a flotation machine again for concentration treatment to obtain concentrate and middlings. The obtained middlings are processed by repeating step S1. Under the condition that the flotation temperature is 60 °C, flotation is carried out for 2 hours to obtain flaky graphite flotation concentrate. The emulsifier is sodium dodecyl sulfate, and the frother is eucalyptus oil;

[0030] S3. The graphite concentrate obtained in step S2 is processed more finely by a No. 2 mill, and then undergoes flotation treatment again by a No. 2 flotation column to obtain large flake graphite ore, and the particle size after flotation is 1 mm.

[0031] Example 3: A flotation process for protecting large flakes of graphite specifically includes the following steps:

[0032] S1. First, subject the raw large flake graphite ore to water quenching treatment, then perform crushing treatment using a crushing device, pass through a 100-mesh sieve, and then successively subject the crushed graphite ore to ball milling and flotation treatments to obtain crude ore and tailings. The tailings are recycled for the graphite in the tailings through multiple flotation processes. After 2 scavenging operations, the recycled graphite ore is obtained. Scavenging is carried out by adding emulsified kerosene and a foaming agent to the tailings. The large flake graphite ore is first calcined in an oxygen-free environment at a temperature of 900 °C for 40 min, and after the calcination is completed, it is directly put into water for cooling;

[0033] S2. First, subject the crude ore obtained in step S1 to treatment using a No. 1 mill, then put it into a No. 1 flotation column for 5 quick-selection and concentration operations, with each flotation lasting 4 - 8 h, to obtain graphite concentrate and middlings. Combine the middlings obtained after 5 concentration operations, and successively subject the combined middlings to thickening and ball milling. Add emulsified kerosene and a foaming agent to it and then perform scavenging, and then send it back to the flotation machine for concentration treatment to obtain concentrate and middlings. The obtained middlings are processed by repeating step S1. Flotation is carried out at a flotation temperature of 80 °C for 4 h to obtain flaky graphite flotation ore. The emulsifying agent is N-dodecyldimethylamine, and the foaming agent is camphor oil;

[0034] S3. The graphite concentrate obtained in step S2 is subjected to more refined treatment using a No. 2 mill, and after flotation treatment using a No. 2 flotation column again, large flake graphite ore is obtained, and the particle size after flotation is 3 mm.

[0035] Example 4: A flotation process for protecting large flakes of graphite, specifically including the following steps:

[0036] S1. First, subject the raw large flake graphite ore to water quenching treatment, then perform crushing treatment using a crushing device, pass through a 60-mesh sieve, and then successively subject the crushed graphite ore to ball milling and flotation treatments to obtain crude ore and tailings. The tailings are recycled for the graphite in the tailings through multiple flotation processes. After 2 scavenging operations, the recycled graphite ore is obtained. Scavenging is carried out by adding emulsified kerosene and a foaming agent to the tailings. The large flake graphite ore is first calcined in an oxygen-free environment at a temperature of 750 °C for 25 min, and after the calcination is completed, it is directly put into water for cooling;

[0037] S2. First, subject the crude ore obtained in step S1 to treatment using a No. 1 mill, then put it into a No. 1 flotation column for 3 - 5 quick-selection and concentration operations, with each flotation lasting 5 h, to obtain graphite concentrate and middlings. Combine the middlings obtained after 4 concentration operations, and successively subject the combined middlings to thickening and ball milling. Add emulsified kerosene and a foaming agent to it and then perform scavenging, and then send it back to the flotation machine for concentration treatment to obtain concentrate and middlings. The obtained middlings are processed by repeating step S1. Flotation is carried out at a flotation temperature of 65 °C for 2.5 h to obtain flaky graphite flotation ore. The emulsifying agent is sodium stearate, and the foaming agent is cresylic acid;

[0038] S3. The graphite concentrate obtained in step S2 is subjected to more refined treatment by a No. 2 mill, and then subjected to flotation treatment by a No. 2 flotation column again to obtain large flake graphite ore. The particle size after flotation is 1.5 mm.

[0039] Example 5: A flotation process for protecting large flakes of graphite, specifically including the following steps:

[0040] S1. The raw material large flake graphite ore is first subjected to water quenching treatment, then subjected to crushing treatment by a crushing device, passed through an 80-mesh sieve, and then the crushed graphite ore is successively subjected to ball milling and flotation treatment to obtain crude ore and tailings. The tailings are recycled for the graphite in the tailings through multiple flotations. After 3 scavenging operations, the recycled graphite ore is obtained. The scavenging is carried out by adding emulsified kerosene and a foaming agent to the tailings. The large flake graphite ore is first calcined in an oxygen-free environment at a temperature of 850 °C for 35 min, and after the calcination is completed, it is directly put into water for cooling;

[0041] S2. The crude ore obtained in step S1 is first treated by a No. 1 mill, and then put into a No. 1 flotation column for 5 quick-selection and concentration operations, each flotation for 7 h, to obtain graphite concentrate and middlings. The middlings obtained after 5 concentration operations are combined. The combined middlings are successively concentrated and ball milled. After adding emulsified kerosene and a foaming agent thereto, scavenging is carried out, and then it is sent back to the flotation machine for concentration treatment to obtain concentrate and middlings. The obtained middlings are processed by repeating step S1. Flotation is carried out at a flotation temperature of 75 °C for 3.5 h to obtain flaky graphite flotation ore. The emulsifying agent is sodium dodecyl sulfate, and the foaming agent is pine oil;

[0042] S3. The graphite concentrate obtained in step S2 is subjected to more refined treatment by a No. 2 mill, and then subjected to flotation treatment by a No. 2 flotation column again to obtain large flake graphite ore. The particle size after flotation is 2.5 mm.

[0043] In summary, the present invention can greatly improve the flotation efficiency of large flake graphite by simplifying the large flake graphite flotation method, and can well achieve the purpose of protecting the large flake graphite by first performing water quenching treatment on the raw material, and can simplify the large flake graphite flotation method and complete the protection treatment of the large flake graphite, which is very beneficial to the large flake graphite flotation work.

[0044] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0045] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0046] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flotation process for protecting large graphite flakes, characterized in that: Specifically, it includes the following steps: S1. First, subject the raw material large flake graphite ore to water quenching treatment, then conduct crushing treatment through a crushing device, screen it through a 50-100 mesh sieve, and then sequentially subject the crushed graphite ore to ball milling and flotation treatment to obtain crude ore and tailings; S2. First, process the crude ore obtained in step S1 through a No. 1 mill, and then put it into a No. 1 flotation column for 3-5 times of quick selection and concentration, with each flotation lasting for 4-8 hours, to obtain graphite concentrate and middlings. Combine the middlings obtained after 3-5 times of concentration; S3. The graphite concentrate obtained in step S2 is subjected to more refined treatment through a No. 2 mill, and after being subjected to flotation treatment again through a No. 2 flotation column, large flake graphite ore is obtained.

2. The flotation process for protecting large graphite flakes according to claim 1, wherein: The tailings in step S1 are used to recover the graphite in the tailings through multiple flotation processes. After 2-3 times of scavenging, the recovered graphite ore is obtained. The scavenging is carried out by adding kerosene emulsified with an emulsifier and a foaming agent to the tailings.

3. The flotation process for protecting large graphite flakes according to claim 1, characterized in that: The combined middlings in step S2 are sequentially concentrated and ball milled. After adding kerosene emulsified with an emulsifier and a foaming agent thereto, scavenging is carried out, and then it is sent into a flotation machine for concentration treatment to obtain concentrate and middlings. The obtained middlings are processed by repeating step S1.

4. A flotation process for protecting large graphite flakes according to claim 1, characterized in that: The flotation temperature in step S2 is 60-80 °C, and flotation is carried out for 2-4 hours to obtain flaky graphite float ore.

5. A flotation process for protecting large graphite flakes according to claim 2, characterized in that: The emulsifier is one of sodium stearate, sodium dodecyl sulfate or N-dodecyl dimethylamine.

6. The flotation process for protecting large graphite flakes according to claim 2, characterized in that: The foaming agent is one of pine oil, eucalyptus oil, camphor oil or cresylic acid.

7. A flotation process for protecting large graphite flakes according to claim 1, characterized in that: The large flake graphite ore in step S1 is first calcined in an oxygen-free environment at a temperature of 700-900 °C for 20-40 minutes. After the calcination is completed, it is directly put into water for cooling.

8. The flotation process for protecting large graphite flakes according to claim 1, characterized in that: The particle size after flotation in step S3 is 1-3 mm.

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