Electrolytic chromium sheet crushing method capable of preventing oxidation

Abstract

The invention provides an anti-oxidation electrolytic chromium sheet crushing method, and relates to the technical field of metallurgy. The anti-oxidation electrolytic chromium sheet crushing method specifically comprises the following steps: S1, equipment preparation; s2, loading an electrolytic chromium sheet; s3, filling argon gas; s4, starting the equipment; and S5, final completion. According to the electrolytic chromium sheet crushing method capable of preventing oxidation, heating and oxidation in the ball milling process are effectively avoided through the water cooling jacket and the argon filling and discharging function of the vacuum ball mill, the purity and quality of metal chromium are kept, and the quality of the metal chromium is improved by accurately controlling the loading amount, the ball milling time and the rotating speed of the electrolytic chromium sheets. The particle size of the produced electrolytic chromium powder better meets the requirement, the production efficiency is improved, in addition, high-purity inert gas argon is continuously introduced, micro-positive pressure in the ball mill is kept, the oxidation risk is further reduced, and the technology has wide application value and remarkable economic and social benefits in the aspects of metal chromium preparation and oxidation prevention.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, in particular to an electrolytic chromium sheet crushing method for preventing oxidation. Background Art

[0002] Chromium metal is an important strategic resource, widely used in aerospace, oil exploration and production, power generation, automobile manufacturing, chemical and petrochemical industries. The main methods for preparing chromium metal are: aluminothermic method, electrolysis method, carbon reduction method, and hydrogen reduction method. Among them, the metal chromium produced by the electrolysis method has a low metal impurity content, generally less than 30ppm, while the gas impurity element O content reaches 5000-6000ppm, which cannot be used directly. It is mainly used as a raw material for the production of high-purity chromium by carbon reduction and hydrogen reduction methods. The existing electrolytic chromium sheet crushing method mainly uses an ordinary ball mill for ball milling, and then crushes the flaky electrolytic chromium sheet into powder. In actual operation of this method, the grinding balls and the material rub against each other during the ball milling process, causing the electrolytic chromium sheet to easily heat up. The metal chromium powder ground under oxygen-rich conditions increases oxygen due to oxidation, which brings great difficulties to the subsequent carbon reduction deoxidation.

[0003] There are some problems with the existing electrolytic chromium flake crushing method. First, the electrolytic chromium flakes are prone to heat up during the ball milling process, which will cause the metal chromium powder to increase in oxygen due to oxidation, affecting its purity and quality. Secondly, the traditional ball mill does not have a cooling function and cannot effectively reduce the oxidation of the electrolytic chromium flakes during the ball milling process. In addition, the existing ball mill does not have the function of filling with nitrogen protective gas, nor can it effectively control the pressure inside the ball mill, which will also affect the crushing effect and product quality of the electrolytic chromium flakes. Finally, the existing electrolytic chromium flake crushing method is not accurate enough in controlling parameters such as the loading amount of the electrolytic chromium flakes, the ball milling time, and the speed of the ball mill cylinder, which will also affect the particle size and production efficiency of the electrolytic chromium powder. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a method for crushing electrolytic chromium sheets to prevent oxidation, thereby solving the problems of low efficiency and low quality in the crushing methods in the prior art.

[0005] To achieve the above objectives, the present invention is implemented by the following technical scheme: a method for crushing electrolytic chromium sheets to prevent oxidation, specifically comprising the following steps: S1. Equipment preparation Prepare a vacuum ball mill, which has a water-cooling jacket and a protective gas chargeable function, and the working medium of the water-cooling jacket is cooling water; S2. Loading of electrolytic chromium sheets Load the electrolytic chromium sheet into the vacuum ball mill, and control the loading amount to 100kg; S3. Fill with argon Start circulating cooling water and start filling with argon gas. The purity of argon gas is 99.99%. By adjusting the valve, the flow rate of argon gas is controlled to 1.5m3 / h, so that the ball mill is under slight positive pressure. S4. Start the device Start the ball mill, set the ball mill cylinder speed to 40r / min, and perform ball milling; S5. Final completion After the ball milling is completed, the ball mill is turned off, the electrolytic chromium powder is taken out, and the particle size of the electrolytic chromium powder is controlled by adjusting the fineness of the leakage line slot.

[0006] Preferably, in the equipment preparation step S1, the cooling water pressure is set to 0.3 MPa.

[0007] Preferably, the particle size requirement of the electrolytic chromium sheets in the step S2 is -500 μm~+75 μm≥85%, -75 μm≤15%.

[0008] Preferably, in step S3, the pressure of the argon gas filled is controlled at 0.2 MPa.

[0009] Preferably, the ball milling time in the starting equipment in step S4 is 2 hours.

[0010] Preferably, the particle size of the electrolytic chromium powder in step S5 finally completed must meet the requirements of -500μm~+75μm≥85% and -75μm≤15%.

[0011] The present invention provides a method for crushing electrolytic chromium sheets to prevent oxidation. It has the following beneficial effects: The invention provides a method for crushing electrolytic chromium sheets to prevent oxidation. The invention adopts a vacuum ball mill to crush the electrolytic chromium sheets. The ball mill is provided with a water-cooling jacket and a nitrogen-fillable protective gas, and can be circulated with water for cooling during the ball milling process to timely take away the heat generated by the ball milling, thereby effectively preventing the electrolytic chromium sheets from heating during the ball milling process, thereby avoiding the increase of oxygen in the metal chromium powder due to oxidation, and ensuring the purity and quality of the metal chromium. The invention installs an air inlet at one end of the ball mill to continuously introduce inert gas argon, and installs a pressure gauge at the other end for detection to keep the ball mill at a slightly positive pressure. This can effectively reduce the oxidation of the electrolytic chromium flakes during the ball milling process, further ensuring the purity and quality of the metallic chromium. The present invention controls the particle size of the electrolytic chromium powder by accurately controlling the loading amount of the electrolytic chromium flakes, the ball milling time, and the speed parameters of the ball mill cylinder, and by adjusting the fineness of the leakage line slot, so that the particle size of the electrolytic chromium powder meets customer needs and improves production efficiency. The electrolytic chromium flake crushing method of the present invention can not only effectively prevent the oxidation of the electrolytic chromium flakes during the ball milling process, ensuring the purity and quality of the metallic chromium, but also improves production efficiency, and has significant economic and social benefits. DETAILED DESCRIPTION

[0012] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0013] The embodiment of the present invention provides a method for crushing electrolytic chromium sheets to prevent oxidation, which specifically includes the following steps: S1. Equipment preparation Prepare a vacuum ball mill, which has a water-cooling jacket and can be filled with protective gas. The working medium of the water-cooling jacket is cooling water, and the cooling water pressure is set to 0.3MPa to ensure sufficient cooling effect; S2. Loading of electrolytic chromium sheets Load the electrolytic chromium flakes into a vacuum ball mill, the loading amount is controlled at 100kg, and the particle size requirements of the electrolytic chromium flakes are -500μm~+75μm≥85%, -75μm≤15%; S3. Fill with argon Turn on the circulating cooling water and start filling with argon gas. The purity of argon gas is 99.99%. By adjusting the valve, the flow rate of argon gas is controlled to 1.5m3 / h, so that the ball mill is under a slight positive pressure and the pressure is controlled at 0.2MPa. S4. Start the device Start the ball mill, set the ball mill cylinder speed to 40r / min, and perform ball milling for 2 hours; S5. Final completion After the ball milling is completed, the ball mill is turned off, the electrolytic chromium powder is taken out, and the particle size of the electrolytic chromium powder is controlled by adjusting the fineness of the leakage line slot to meet the requirements of -500μm~+75μm≥85% and -75μm≤15%. Through the above steps, the oxidation of the electrolytic chromium flakes during the ball milling process can be effectively prevented, the purity and quality of the metallic chromium are guaranteed, and the production efficiency is also improved.

[0014] The present invention adopts a vacuum ball mill to crush the electrolytic chromium flakes. The ball mill is equipped with a water-cooling jacket and a gas that can be charged and discharged. The water-cooling jacket can be used for circulating water cooling (water pressure 0.2-0.4MPa) during the ball milling process to promptly take away the heat generated by the ball milling process, thereby avoiding the phenomenon of increased oxygen and nitrogen caused by the heat generated during the ball milling process of the electrolytic chromium flakes. An air inlet is installed at one end of the ball mill to continuously introduce inert gas argon. A pressure gauge is installed at the other end for detection to maintain a slightly positive pressure in the ball mill. This can effectively reduce the oxidation of the electrolytic chromium flakes during the ball milling process and ensure the purity and quality of the metallic chromium. The amount of electrolytic chromium flakes loaded is controlled at 80-150kg, which is beneficial to the control of the chromium powder particle size and the improvement of production efficiency. Argon gas is continuously introduced into the ball mill through the air inlet hole. The purity of the argon gas is ≥99.99%, and the flow rate is controlled at 0.5-3.0m 3 / h. The pressure in the ball mill is monitored by a pressure gauge to maintain a slight positive pressure in the ball mill, and the pressure is controlled at 0.1-0.3MPa. The ball milling time is controlled at 1-3 hours, and the speed of the ball mill cylinder is controlled at 30-50r / min. The particle size of the electrolytic chromium powder is controlled by adjusting the fineness of the leakage line slot during the ball milling process. The particle size requirements of the electrolytic chromium powder are -500μm~+75μm≥85%, -75μm≤15%.

[0015] Compared with the prior art, the technical solution mainly solves the problem that the electrolytic chromium sheet generates heat during the ball milling process, leading to oxidation of the metal chromium powder. The traditional ball mill does not have a cooling function and cannot effectively reduce the oxidation of the electrolytic chromium sheet during the ball milling process. The existing ball mill does not have the function of filling with nitrogen protective gas and cannot effectively control the pressure in the ball mill. The existing electrolytic chromium sheet crushing method is not accurate enough in controlling parameters such as the loading amount of the electrolytic chromium sheet, the ball milling time, and the speed of the ball mill cylinder, which affects the particle size and production efficiency of the electrolytic chromium powder.

[0016] Due to the advanced nature of the technical solution, it can be widely used in the application fields of metal chromium preparation, electrolytic chromium sheet crushing, oxidation prevention, etc. First, the electrolytic chromium sheet crushing method of the present invention can effectively prevent the oxidation of the electrolytic chromium sheet during the ball milling process, thereby ensuring the purity and quality of the metal chromium, which is of great significance to the preparation field of metal chromium. Secondly, the ball mill of the present invention has a water-cooled jacket and the function of being able to charge and discharge gas, which can effectively reduce the oxidation of the electrolytic chromium sheet during the ball milling process, which has important application value in the field of electrolytic chromium sheet crushing. In addition, the electrolytic chromium sheet crushing method of the present invention has more precise control over parameters such as the loading amount of the electrolytic chromium sheet, the ball milling time, and the speed of the ball mill cylinder, which is of great significance for improving the particle size and production efficiency of the electrolytic chromium powder. Finally, since the electrolytic chromium sheet crushing method of the present invention can effectively prevent the oxidation of the electrolytic chromium sheet during the ball milling process, it also has important application value in the field of oxidation prevention technology. In general, the electrolytic chromium sheet crushing method of the present invention has the advantages of high efficiency, precision, and safety, and therefore has a broad demand in the market.

[0017] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for crushing electrolytic chromium sheets to prevent oxidation, characterized in that: The specific steps include: S1. Equipment preparation Prepare a vacuum ball mill, which has a water-cooling jacket and a protective gas chargeable function, and the working medium of the water-cooling jacket is cooling water; S2. Loading of electrolytic chromium sheets Load the electrolytic chromium sheet into the vacuum ball mill, and control the loading amount to 100kg; S3. Fill with argon Start circulating cooling water and start filling with argon gas. The purity of argon gas is 99.99%. By adjusting the valve, the flow rate of argon gas is controlled to 1.5m3 / h, so that the ball mill is under slight positive pressure. S4. Start the device Start the ball mill, set the ball mill cylinder speed to 40r / min, and perform ball milling; S5. Final completion After the ball milling is completed, the ball mill is turned off, the electrolytic chromium powder is taken out, and the particle size of the electrolytic chromium powder is controlled by adjusting the fineness of the leakage line slot.

2. The method for crushing electrolytic chromium sheets to prevent oxidation according to claim 1, characterized in that: In the step S1 equipment preparation, the cooling water pressure is set to 0.3 MPa.

3. The method for crushing electrolytic chromium sheets to prevent oxidation according to claim 1, characterized in that: The particle size requirements of the electrolytic chromium sheets in the step S2 are -500 μm~+75 μm≥85% and -75 μm≤15%.

4. The method for crushing electrolytic chromium sheets to prevent oxidation according to claim 1, characterized in that: In step S3, the pressure of the argon gas filled is controlled at 0.2 MPa.

5. The method for crushing electrolytic chromium sheets to prevent oxidation according to claim 1, characterized in that: The ball milling time in the starting equipment in step S4 is 2 hours.

6. The method for crushing electrolytic chromium sheets to prevent oxidation according to claim 1, characterized in that: The particle size of the electrolytic chromium powder in step S5 must meet the requirements of -500μm~+75μm≥85% and -75μm≤15%.