Anode carbon block anti-oxidation coating spraying waste recycling method

Abstract

The invention discloses an anode carbon block anti-oxidation coating spraying waste recycling method which comprises the steps that paint mist falling objects generated when anode carbon blocks are sprayed with anti-oxidation coatings are recycled, and the paint mist falling objects are separated through an aqueous solution by adopting a reselection separation method to obtain carbon powder and remaining materials; the remaining materials are analyzed, and the ratio of calcium compounds to silicides is 1: (1.5-3) according to the mass fraction; the ratio of the silicide to the aluminum oxide is 1: (2-4); and preparing the anti-oxidation coating containing calcium compounds, silicides and aluminum oxide by using the excess materials. The method comprises the following steps: collecting the ceramic-based anti-oxidation coating material with falling paint mist, washing with water, removing carbon powder by utilizing density difference, drying residual ceramic powder, detecting components, taking the residual ceramic powder as a raw material of the ceramic-based anti-oxidation coating material according to a certain proportion, and returning to a coating production process.

Description

Technical Field

[0001] The present application relates to the technical field of spray waste recycling, and in particular to a method for recycling anode carbon block anti-oxidation coating spray waste. Background Art

[0002] In the prior art, ceramic-based anti-oxidation coating materials are commonly used as anti-oxidation coatings for anode carbon blocks. The main raw materials of ceramic-based anti-oxidation coating materials are metallurgical-grade primary alumina, which also includes ceramic components such as quartz. Ceramic-based anti-oxidation coating materials have high quality requirements, high prices, and high production costs. During the spraying process of anode carbon blocks using ceramic-based anti-oxidation coating materials, about 10% of the paint mist falls, causing waste. Therefore, it is necessary to recycle the ceramic-based anti-oxidation coating materials with the paint mist falling. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the purpose of the present application is to propose a method for recycling anode carbon block anti-oxidation coating spray waste, in which the ceramic-based anti-oxidation coating material falling from the paint mist is collected, washed with water, and the carbon powder is removed by using the density difference, and the remaining ceramic powder is dried, the composition is tested, and a certain proportion is used as the raw material of the ceramic-based anti-oxidation coating material, and returned to the coating production process.

[0004] To achieve the above-mentioned purpose, the present application proposes a method for recycling waste materials of anode carbon block anti-oxidation coating spraying, including a method for recycling waste materials of anode carbon block anti-oxidation coating spraying, including Recovering the paint mist drifting down when the anode carbon block is sprayed with the anti-oxidation coating, and separating the paint mist drifting down into carbon powder and residual material by using an aqueous solution and a gravity separation method; The residual material is analyzed, wherein the ratio of calcification to silicide is 1:1.5-3 by weight; the ratio of silicide to alumina is 1:2-4; The residual material is used to prepare an anti-oxidation coating containing calcification, silicide and aluminum oxide.

[0005] In some embodiments, the gravity separation method includes the following steps: grinding and crushing the paint mist drifting matter, subjecting it to a classification process, and then wet grinding it to obtain ore pulp; subjecting the ore pulp to wet gravity separation to obtain carbon powder and the residue respectively.

[0006] In some embodiments, the filling rate of the grinding media in the wet grinding is less than 30%; the mass content of the wet grinding to particles ≤100 μm is 30-100%, and the mass content of particles ≤20 μm is less than 30%.

[0007] In some embodiments, the grinding medium is at least one of a steel ball, a steel rod or a steel forging; when the steel ball is used as the grinding medium, the mass percentage of the steel ball is: 10-20% for large balls, 30-70% for medium balls, and 10-60% for small balls, and the total is 100%, wherein the diameter of the large ball is ≥80mm, the diameter of the medium ball is 55-65mm, and the diameter of the small ball is ≤35mm; when the steel rod is used as the grinding medium, the mass percentage of the steel rod is: 30-80% for diameter ≥70mm, 20-70% for diameter 55-65mm, and 0-50% for diameter ≤50mm, and the total is 100%.

[0008] In some embodiments, the wet grinding is performed by adding water or sodium aluminate solution to make pulp until the pulp mass concentration is 50-70%.

[0009] In some embodiments, the temperature of wet gravity separation is 5 to 100°C; the equipment used for wet gravity separation is one or more of a shaking table, a jig, a spiral chute, a felt machine, a mud bucket or a centrifugal separator; when a jig or a shaking table is used, the stroke is 6 to 20 mm and the stroke frequency is 40 to 200 times / min.

[0010] In some embodiments, when wet gravity separation is adopted, the specific operation is as follows: water or sodium aluminate solution is added to the slurry to adjust the slurry to a mass concentration of 5 to 40%.

[0011] In some embodiments, the classification process is performed, the threshold range of the coarse and fine particle size classification is 1 to 10 mm, and the classification equipment is one or a combination of a cyclone, a vibrating screen, and a classifier.

[0012] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 It is a flow chart of the method for recycling anti-oxidation coating spray waste proposed in this application. DETAILED DESCRIPTION

[0014] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be construed as limiting the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0015] The examples of the present application are described in detail below, and the examples of the examples are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The examples described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0016] like Figure 1 As shown, in order to achieve the above purpose, the present application proposes a method for recycling anode carbon block anti-oxidation coating spray waste, including a method for recycling anode carbon block anti-oxidation coating spray waste, comprising: S1: Recover the paint mist falling when the anode carbon block is sprayed with anti-oxidation coating, and separate the paint mist falling by using aqueous solution by gravity separation method to obtain carbon powder and residual material; S2: Analyze the remaining material, where the ratio of calcification to silicide is 1:1.5~3 by mass; the ratio of silicide to alumina is 1:2~4; S3: using the remaining material to prepare an anti-oxidation coating containing calcification, silicide and aluminum oxide.

[0017] In S1, the paint mist falling when the anode carbon block is sprayed with anti-oxidation coating is recovered, the paint mist falling is ground and crushed, and then processed by a classification process. The coarse and fine particle size classification threshold range is 1 to 10 mm, and the classification equipment is one or a combination of cyclone, vibrating screen, and classifier.

[0018] The coarse and fine particle size classification particles are wet ground to obtain ore pulp, wherein the grinding medium is at least one of steel balls, steel rods or steel forgings; when steel balls are used as grinding media, the mass percentage of steel balls is: 10-20% for large balls, 30-70% for medium balls, 10-60% for small balls, and the total is 100%, wherein the diameter of large balls is ≥80mm, the diameter of medium balls is 55-65mm, and the diameter of small balls is ≤35mm; when steel rods are used as grinding media, the mass percentage of steel rods is: 30-80% for diameters ≥70mm, 20-70% for diameters 55-65mm, 0-50% for diameters ≤50mm, and the total is 100%. The wet grinding is performed by adding water or sodium aluminate solution to make pulp until the mass concentration of the ore pulp is 50-70%. The filling rate of the grinding medium in wet grinding is less than 30%; the mass content of wet grinding to particles ≤100μm is 30-100%, and the mass content of particles ≤20μm is less than 30%.

[0019] The ore pulp is subjected to wet gravity separation, water or sodium aluminate solution is added to the ore pulp to adjust the ore pulp mass concentration to 5-40%, and the temperature of wet gravity separation is 5-100°C; the equipment used for wet gravity separation is one or more of a shaking table, a jig, a spiral chute, a blanket machine, a bucket mud or a centrifugal separator; when a jig or a shaking table is used, the stroke is 6-20 mm, and the stroke frequency is 40-200 times / min, and carbon powder and residual material are obtained respectively.

[0020] S2: Analyze the remaining material, where the ratio of calcification to silicide is 1:1.5~3 by mass; the ratio of silicide to alumina is 1:2~4; S3: using the remaining material to prepare an anti-oxidation coating containing calcification, silicide and aluminum oxide.

[0021] This application adopts controlled grinding to enrich carbon powder to the fine particle size and to enrich difficult-to-grind minerals such as alumina and quartz to the coarse particle size based on the differences that carbon powder has a fine particle size and a small density, while ceramics such as alumina and quartz have a coarse particle size and a high specific gravity and are difficult to grind; and then through gravity selection, each mineral is separated according to the specific gravity and particle size to obtain carbon powder mainly in the light and fine particle size, and alumina and quartz with a high specific gravity and a coarse particle size, thereby obtaining the residual material that can be used as a raw material for alumina production. This application has a simple process, low cost, no chemical addition, is economical and environmentally friendly, has a high resource utilization rate, and can recycle the ceramic-based anti-oxidation coating material that has fallen from the paint mist.

[0022] Example 1 The paint mist falling when the anti-oxidation coating is sprayed on the anode carbon block is recovered, ground and crushed, and then processed using a grading process. The coarse and fine particle size classification threshold range is 10mm, and the grading equipment is a cyclone.

[0023] The coarse and fine particle size classification particles are wet ground to obtain a slurry, wherein the grinding medium is a steel ball, and the mass percentage of the steel ball is: 20% for large balls, 70% for medium balls, and 10% for small balls, wherein the diameter of the large balls is 80 mm, the diameter of the medium balls is 65 mm, and the diameter of the small balls is 35 mm. In this embodiment, the wet grinding is performed by adding an aqueous solution to make a slurry to a slurry mass concentration of 50%. The filling rate of the grinding medium in the wet grinding is 30%; the mass content of the wet grinding to a particle size ≤100 μm is 70%, and the mass content of the particle size ≤20 μm is 30%.

[0024] The ore pulp was subjected to wet gravity separation, and the ore pulp was slurried with an aqueous solution to a mass concentration of 40%. The temperature of the wet gravity separation was 550°C. The equipment used for the wet gravity separation was a shaking table with a stroke of 6 mm and a stroke of 200 times / min, and carbon powder and residual material were obtained respectively. The residual material was analyzed, and the ratio of calcification to silicide was 1:1.5 by mass, and the ratio of silicide to alumina was 1:4. The residual material was used to prepare an anti-oxidation coating containing calcification, silicide and alumina.

[0025] Example 2 The paint mist falling when the anti-oxidation coating is sprayed on the anode carbon block is recovered, the paint mist falling is ground and crushed, and then processed using a grading process. The threshold range of the coarse and fine particle size classification is 5mm, and the grading equipment is a classifier.

[0026] The coarse and fine particle size classification particles are wet ground to obtain ore slurry, wherein the grinding medium is steel balls, and the mass percentage of steel balls is: large balls 10%, medium balls 60%, and small balls 30%. Among them, the diameter of the large balls is 90mm, the diameter of the medium balls is 55mm, and the diameter of the small balls is 30mm. The wet grinding is made by adding sodium aluminate solution to make the slurry mass concentration of 70%. The filling rate of the grinding medium in the wet grinding is 20%; the mass content of the wet grinding to a particle size of ≤100μm is 80%, and the mass content of the particle size of ≤20μm is 20%.

[0027] The ore pulp is subjected to wet gravity separation, water or sodium aluminate solution is added to the ore pulp to adjust the mass concentration of the ore pulp to 5%, and the temperature of the wet gravity separation is 10°C; the equipment used for wet gravity separation is a jig, the stroke is 20mm, and the stroke is 40 times / min, and carbon powder and residual material are obtained respectively. The residual material is analyzed, and the ratio of calcification to silicide is 1:3 by mass; the ratio of silicide to alumina is 1:2; the residual material is used to prepare an anti-oxidation coating containing calcification, silicide and alumina.

[0028] Example 3 The paint mist falling when the anti-oxidation coating is sprayed on the anode carbon block is recovered, ground and crushed, and then processed using a grading process. The coarse and fine particle size classification threshold range is 1mm, and the grading equipment is a vibrating screen.

[0029] The coarse and fine particle size classification particles are wet ground to obtain slurry, wherein the grinding medium is steel rods, and the mass percentage of the steel rods is: 80% of the diameter of 70mm, 20% of the diameter of 55mm, 0% of the diameter ≤50mm, and the total is 100%. The wet grinding is slurrying by adding an aqueous solution to a slurry mass concentration of 60%. The filling rate of the grinding medium in the wet grinding is 30%; the mass content of the wet grinding to a particle size of ≤100μm is 40%, and the mass content of the particle size of ≤20μm is 20%.

[0030] The ore pulp is subjected to wet gravity separation, water or sodium aluminate solution is added to the ore pulp to adjust the mass concentration of the ore pulp to 20%, and the temperature of the wet gravity separation is 15°C; the equipment used for wet gravity separation is a shaking table, the stroke is 10mm, and the stroke is 100 times / min, and carbon powder and residual material are obtained respectively. The residual material is analyzed, and the ratio of calcification to silicide is 1:2 by mass; the ratio of silicide to alumina is 1:3; the residual material is used to prepare an anti-oxidation coating containing calcification, silicide and alumina.

[0031] Example 4 The paint mist falling when the anti-oxidation coating is sprayed on the anode carbon block is recovered, ground and crushed, and then processed using a grading process. The coarse and fine particle size classification threshold range is 6mm, and the grading equipment is a cyclone.

[0032] The coarse and fine particle size classification particles are wet ground to obtain slurry, wherein the grinding medium is steel rods, and the mass percentage of the steel rods is: 30% of the diameter of 70mm, 60% of the diameter of 55mm, 10% of the diameter ≤50mm, and the total is 100%. The wet grinding is made by adding sodium aluminate to make slurry to a slurry mass concentration of 65%. The filling rate of the grinding medium in the wet grinding is 30%; the mass content of the wet grinding to a particle size of ≤100μm is 60%, and the mass content of the particle size of ≤20μm is 30%.

[0033] The ore pulp is subjected to wet gravity separation, water or sodium aluminate solution is added to the ore pulp to adjust the mass concentration of the ore pulp to 35%, and the temperature of the wet gravity separation is 40°C; the equipment used for wet gravity separation is a shaking table, the stroke is 10mm, and the stroke frequency is 100 times / min, and carbon powder and residual material are obtained respectively. The residual material is analyzed, and the ratio of calcification to silicide is 1:2 by mass; the ratio of silicide to alumina is 1:4; the residual material is used to prepare an anti-oxidation coating containing calcification, silicide and alumina.

[0034] Example 5 The paint mist falling when the anti-oxidation coating is sprayed on the anode carbon block is recovered, ground and crushed, and then processed using a grading process. The coarse and fine particle size classification threshold range is 8mm, and the grading equipment is a cyclone.

[0035] The coarse and fine particle size classification particles are wet ground to obtain slurry, wherein the grinding medium is steel rods, and the mass percentage of the steel rods is: 30% of the diameter of 70mm, 50% of the diameter of 55mm, 20% of the diameter ≤50mm, and the total is 100%. The wet grinding is made by adding sodium aluminate to make slurry to a slurry mass concentration of 65%. The filling rate of the grinding medium in the wet grinding is 30%; the mass content of the wet grinding to a particle size ≤100μm is 60%, and the mass content of the particle size ≤20μm is 30%.

[0036] The ore pulp is subjected to wet gravity separation, water or sodium aluminate solution is added to the ore pulp to adjust the mass concentration of the ore pulp to 35%, and the temperature of the wet gravity separation is 40°C; the equipment used for wet gravity separation is a shaking table, the stroke is 10mm, and the stroke is 150 times / min, and carbon powder and residual material are obtained respectively. The residual material is analyzed, and the ratio of calcification to silicide is 1:2.5 by mass; the ratio of silicide to alumina is 1:3.5; the residual material is used to prepare an anti-oxidation coating containing calcification, silicide and alumina.

[0037] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0038] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0040] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for recycling waste materials from anode carbon block anti-oxidation coating spraying, characterized in that: include Recovering the paint mist drifting down when the anode carbon block is sprayed with the anti-oxidation coating, and separating the paint mist drifting down into carbon powder and residual material by using an aqueous solution and a gravity separation method; The residual material is analyzed, wherein the ratio of calcification to silicide is 1:1.5-3 by weight; the ratio of silicide to alumina is 1:2-4; The residual material is used to prepare an anti-oxidation coating containing calcification, silicide and aluminum oxide.

2. The method according to claim 1, characterized in that The gravity separation method comprises the following steps: grinding and crushing the paint mist drifting material, subjecting it to a classification process, and then wet grinding it to obtain ore pulp; and subjecting the ore pulp to wet gravity separation to obtain carbon powder and the residual material respectively.

3. The method according to claim 2, characterized in that The filling rate of the grinding medium in the wet grinding is less than 30%; the mass content of the wet grinding to particles with a diameter of ≤100 μm is 30-100%, and the mass content of particles with a diameter of ≤20 μm is less than 30%.

4. The method according to claim 3, characterized in that The grinding medium is at least one of a steel ball, a steel rod or a steel forging; when the steel ball is used as the grinding medium, the mass percentage of the steel ball is: 10-20% for large balls, 30-70% for medium balls, 10-60% for small balls, and the total is 100%, wherein the diameter of the large ball is ≥80mm, the diameter of the medium ball is 55-65mm, and the diameter of the small ball is ≤35mm; when the steel rod is used as the grinding medium, the mass percentage of the steel rod is: 30-80% for diameters ≥70mm, 20-70% for diameters 55-65mm, and 0-50% for diameters ≤50mm, and the total is 100%.

5. The method according to any one of claims 2 to 4, characterized in that: The wet grinding is to add water or sodium aluminate solution to make pulp until the pulp mass concentration is 50-70%.

6. The method according to claim 5, characterized in that The temperature of wet gravity separation is 5-100°C; the equipment used for wet gravity separation is one or more of a shaking table, a jig, a spiral chute, a blanket machine, a bucket mud or a centrifugal separator; when a jig or a shaking table is used, the stroke is 6-20 mm and the stroke frequency is 40-200 times / min.

7. The method according to claim 6, characterized in that When wet gravity separation is adopted, the specific operation is as follows: water or sodium aluminate solution is added to the ore pulp to adjust the slurry to a mass concentration of 5 to 40%.

8. The method according to claim 6, characterized in that The grading process is used, the threshold range of coarse and fine particle size classification is 1 to 10 mm, and the grading equipment is one or a combination of cyclone, vibrating screen and classifier.

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