Efficient vacuum dewatering and filtering process for refined iron powder

Abstract

The invention discloses a high-efficiency fine iron powder vacuum dewatering and filtering process which comprises the following steps: (1) preparing slurry: primarily screening an iron powder raw material through screening equipment, then collecting the screened iron powder raw material, pouring the collected iron powder raw material into a mixer, and uniformly mixing the iron powder raw material and the slurry; then adding a dispersing agent and water, heating and uniformly stirring; by adopting the filtering process designed by the invention, the production capacity can be improved, and more refined iron powder slurry can be treated in unit time by optimizing the concentration and granularity of the slurry and adjusting the vacuum degree and temperature, so that the yield of the whole refined iron powder is improved, the larger-scale market demand is met, or the production benefits of enterprises are improved; meanwhile, the filtering medium is regularly cleaned and replaced, so that the cost caused by frequent replacement of the blocked filtering medium can be reduced; the concentration, the granularity, the vacuum degree and the temperature of the slurry are accurately controlled, and the conditions of energy waste, material loss and the like caused by an unreasonable process can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of iron powder, in particular to a high-efficiency vacuum dehydration and filtration process for refined iron powder. Background Art

[0002] Iron ore powder, also known as iron concentrate, is a high-grade iron ore powder obtained after crushing, grinding, beneficiation and other processing. It is mainly made of iron ore through fine processing, including magnetic separation, flotation or gravity separation and other beneficiation methods to remove useless impurities and improve the grade of the ore.

[0003] Refined iron powder is black in color and is the main raw material for powder metallurgy. It is used in the largest amount in powder metallurgy production, accounting for about 85% of the total consumption of metal powder. Its main market is the manufacture of mechanical parts, and the amount of iron powder required accounts for about 80% of the total output of iron powder.

[0004] At present, when producing refined iron powder, it needs to be vacuum dehydrated and filtered. The current production method still has certain limitations and cannot achieve efficient and fast selection. In order to improve the production efficiency of refined iron powder, it is necessary to design an efficient refined iron powder vacuum dehydration and filtration process. Summary of the invention

[0005] The purpose of the present invention is to provide a high-efficiency refined iron powder vacuum dehydration filtration process, which has the advantage of high efficiency and solves the problems raised by the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a high-efficiency vacuum dehydration and filtration process for refined iron powder, comprising the following steps: 1. Preparation of slurry: First, the iron powder raw material is preliminarily screened by screening equipment, and then the screened iron powder raw material is collected, and then the collected iron powder raw material is poured into a mixer, and then a dispersant and water are added and heated and stirred evenly; (ii) Vacuum filtration: The prepared slurry is sent to a vacuum filter for filtration. The vacuum filter uses the negative pressure generated by the vacuum system to discharge the water in the iron ore concentrate slurry through the filter medium. As the vacuum filtration proceeds, the solid particles in the iron ore concentrate slurry gradually form a filter cake on the filter medium. When the filter cake reaches a certain thickness, the filtration is stopped and the material is discharged to obtain a fine iron powder filter cake. (III) Maintenance of vacuum filter: A. In order to improve the filtration efficiency of the vacuum filter, it is necessary to regularly check the working status of the vacuum pump, including the integrity of the sealing ring, gas ballast valve gasket, air inlet, exhaust valve plate and other components. At the same time, it is necessary to regularly clean the sediment and impurities inside the vacuum pump to keep it unobstructed; B. The filter medium needs to be regularly cleaned by spraying with a high-pressure water gun. At the same time, the wear of the filter medium needs to be regularly checked, and the filter medium with severe wear needs to be replaced; 4. Wastewater treatment: The filtrate generated during the filtration process is discharged into the wastewater treatment system or reuse system through a pipeline for recycling.

[0007] Preferably, in the step 1, when preparing the slurry, iron powder raw material with large and uniform particle size is preferred.

[0008] Preferably, the concentration of the slurry in step 1 is controlled at 350-400 g / L after preparation.

[0009] Preferably, the temperature of the slurry in step 1 is controlled at 40-60° C. after preparation.

[0010] Preferably, in step 2, the vacuum degree is controlled between -0.06MPa and -0.08MPa during vacuum filtration, and the filter speed is controlled at 0.5-1.5r / min.

[0011] Preferably, in step three, maintenance of the vacuum filter needs to be performed every three months, and equipment maintenance records are established to record the time, content and results of each maintenance and overhaul.

[0012] Preferably, the filter medium in step three is filtered using filter cloth, and the filter cloth is made of a suitable material according to the viscosity, acidity and alkalinity, and abrasiveness of the material.

[0013] Preferably, after the filter cloth in step three is replaced, the new filter cloth needs to be soaked and dried to improve its stability and filtering performance.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By adopting the filtration process designed by the present invention, the production capacity can be improved. By optimizing the slurry concentration and particle size and adjusting the vacuum degree and temperature, it is helpful to process more refined iron powder slurry in a unit time, thereby increasing the overall output of refined iron powder, meeting larger market demands or improving the production efficiency of the enterprise. At the same time, by regularly cleaning and replacing the filter medium, the cost caused by frequent replacement of the filter medium due to blockage can be reduced; precise control of the slurry concentration, particle size, vacuum degree, and temperature can avoid energy waste and material loss caused by unreasonable process, thereby effectively reducing the production cost of refined iron powder and enhancing the market competitiveness of the product. At the same time, the stable filtration process can better separate the refined iron powder from impurities and moisture, and obtain a refined iron powder product with higher purity, lower water content and more uniform particle size, which is beneficial to subsequent processing or direct application, improves the quality reputation of the product in the market, and expands the product application range and customer base. DETAILED DESCRIPTION

[0015] 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.

[0016] The present invention provides a technical solution: A high-efficiency vacuum dehydration and filtration process for refined iron powder comprises the following steps: 1. Preparation of slurry: First, the iron powder raw material is preliminarily screened by screening equipment, and then the screened iron powder raw material is collected, and then the collected iron powder raw material is poured into a mixer, and then a dispersant and water are added and heated and stirred evenly; (ii) Vacuum filtration: The prepared slurry is sent to a vacuum filter for filtration. The vacuum filter uses the negative pressure generated by the vacuum system to discharge the water in the iron ore concentrate slurry through the filter medium. As the vacuum filtration proceeds, the solid particles in the iron ore concentrate slurry gradually form a filter cake on the filter medium. When the filter cake reaches a certain thickness, the filtration is stopped and the material is discharged to obtain a fine iron powder filter cake. (III) Maintenance of vacuum filter: A. In order to improve the filtration efficiency of the vacuum filter, it is necessary to regularly check the working status of the vacuum pump, including the integrity of the sealing ring, gas ballast valve gasket, air inlet, exhaust valve plate and other components. At the same time, it is necessary to regularly clean the sediment and impurities inside the vacuum pump to keep it unobstructed; B. The filter medium needs to be regularly cleaned by spraying with a high-pressure water gun. At the same time, the wear of the filter medium needs to be regularly checked, and the filter medium with severe wear needs to be replaced; 4. Wastewater treatment: The filtrate generated during the filtration process is discharged into the wastewater treatment system or reuse system through a pipeline for recycling. Embodiment 1:

[0017] (i) Preparation of slurry: First, the iron powder raw material is preliminarily screened through screening equipment, and then the screened iron powder raw material is collected, and then the collected iron powder raw material is poured into a mixer, and then a dispersant and water are added and heated and stirred evenly; (ii) Vacuum filtration: The prepared slurry is sent to a vacuum filter for filtration. The vacuum filter uses the negative pressure generated by the vacuum system to discharge the moisture in the iron ore concentrate slurry through the filter medium. As the vacuum filtration proceeds, the solid particles in the iron ore concentrate slurry gradually form a filter cake on the filter medium. When the filter cake reaches a certain thickness, stop filtering and unload the material to obtain a fine iron powder filter cake. ; (iii) Maintenance of vacuum filter: A. In order to improve the filtering efficiency of the vacuum filter, it is necessary to regularly check the working status of the vacuum pump, including the integrity of the sealing ring, gas ballast valve gasket, air inlet, exhaust valve plate and other components. At the same time, it is necessary to regularly clean the sediment and impurities inside the vacuum pump to keep it unobstructed; B. The filter medium needs to be regularly sprayed and cleaned with a high-pressure water gun. At the same time, it is necessary to regularly check the wear of the filter medium and replace the filter medium that is severely worn; (iv) Wastewater treatment: The filtrate generated during the filtration process is discharged into the wastewater treatment system or reuse system through a pipeline for recycling and reuse. Embodiment 2:

[0018] In the first embodiment, the following steps are added: In step 1, when preparing the slurry, it is preferred to use iron powder raw materials with large and uniform particle size.

[0019] (i) Preparation of slurry: First, the iron powder raw material is preliminarily screened through screening equipment, and then the screened iron powder raw material is collected, and then the collected iron powder raw material is poured into a mixer, and then a dispersant and water are added and heated and stirred evenly; (ii) Vacuum filtration: The prepared slurry is sent to a vacuum filter for filtration. The vacuum filter uses the negative pressure generated by the vacuum system to discharge the moisture in the iron ore concentrate slurry through the filter medium. As the vacuum filtration proceeds, the solid particles in the iron ore concentrate slurry gradually form a filter cake on the filter medium. When the filter cake reaches a certain thickness, stop filtering and unload the material to obtain a fine iron powder filter cake. ; (iii) Maintenance of vacuum filter: A. In order to improve the filtering efficiency of the vacuum filter, it is necessary to regularly check the working status of the vacuum pump, including the integrity of the sealing ring, gas ballast valve gasket, air inlet, exhaust valve plate and other components. At the same time, it is necessary to regularly clean the sediment and impurities inside the vacuum pump to keep it unobstructed; B. The filter medium needs to be regularly sprayed and cleaned with a high-pressure water gun. At the same time, it is necessary to regularly check the wear of the filter medium and replace the filter medium that is severely worn; (iv) Wastewater treatment: The filtrate generated during the filtration process is discharged into the wastewater treatment system or reuse system through a pipeline for recycling and reuse. Embodiment three:

[0020] In the second embodiment, the following steps are added: After the slurry in step 1 is prepared, its concentration is controlled at 350-400 g / L.

[0021] (i) Preparation of slurry: First, the iron powder raw material is preliminarily screened through screening equipment, and then the screened iron powder raw material is collected, and then the collected iron powder raw material is poured into a mixer, and then a dispersant and water are added and heated and stirred evenly; (ii) Vacuum filtration: The prepared slurry is sent to a vacuum filter for filtration. The vacuum filter uses the negative pressure generated by the vacuum system to discharge the moisture in the iron ore concentrate slurry through the filter medium. As the vacuum filtration proceeds, the solid particles in the iron ore concentrate slurry gradually form a filter cake on the filter medium. When the filter cake reaches a certain thickness, stop filtering and unload the material to obtain a fine iron powder filter cake. ; (iii) Maintenance of vacuum filter: A. In order to improve the filtering efficiency of the vacuum filter, it is necessary to regularly check the working status of the vacuum pump, including the integrity of the sealing ring, gas ballast valve gasket, air inlet, exhaust valve plate and other components. At the same time, it is necessary to regularly clean the sediment and impurities inside the vacuum pump to keep it unobstructed; B. The filter medium needs to be regularly sprayed and cleaned with a high-pressure water gun. At the same time, it is necessary to regularly check the wear of the filter medium and replace the filter medium that is severely worn; (iv) Wastewater treatment: The filtrate generated during the filtration process is discharged into the wastewater treatment system or reuse system through a pipeline for recycling and reuse. Embodiment 4:

[0022] In the third embodiment, the following steps are added: After the slurry in step 1 is prepared, its temperature is controlled at 40-60°C.

[0023] (i) Preparation of slurry: First, the iron powder raw material is preliminarily screened through screening equipment, and then the screened iron powder raw material is collected, and then the collected iron powder raw material is poured into a mixer, and then a dispersant and water are added and heated and stirred evenly; (ii) Vacuum filtration: The prepared slurry is sent to a vacuum filter for filtration. The vacuum filter uses the negative pressure generated by the vacuum system to discharge the moisture in the iron ore concentrate slurry through the filter medium. As the vacuum filtration proceeds, the solid particles in the iron ore concentrate slurry gradually form a filter cake on the filter medium. When the filter cake reaches a certain thickness, stop filtering and unload the material to obtain a fine iron powder filter cake. ; (iii) Maintenance of vacuum filter: A. In order to improve the filtering efficiency of the vacuum filter, it is necessary to regularly check the working status of the vacuum pump, including the integrity of the sealing ring, gas ballast valve gasket, air inlet, exhaust valve plate and other components. At the same time, it is necessary to regularly clean the sediment and impurities inside the vacuum pump to keep it unobstructed; B. The filter medium needs to be regularly sprayed and cleaned with a high-pressure water gun. At the same time, it is necessary to regularly check the wear of the filter medium and replace the filter medium that is severely worn; (iv) Wastewater treatment: The filtrate generated during the filtration process is discharged into the wastewater treatment system or reuse system through a pipeline for recycling and reuse. Embodiment five:

[0024] In the fourth embodiment, the following steps are added: Step 2: During vacuum filtration, the vacuum degree is controlled between -0.06MPa and -0.08MPa, and the filter speed is controlled at 0.5-1.5r / min.

[0025] (i) Preparation of slurry: First, the iron powder raw material is preliminarily screened through screening equipment, and then the screened iron powder raw material is collected, and then the collected iron powder raw material is poured into a mixer, and then a dispersant and water are added and heated and stirred evenly; (ii) Vacuum filtration: The prepared slurry is sent to a vacuum filter for filtration. The vacuum filter uses the negative pressure generated by the vacuum system to discharge the moisture in the iron ore concentrate slurry through the filter medium. As the vacuum filtration proceeds, the solid particles in the iron ore concentrate slurry gradually form a filter cake on the filter medium. When the filter cake reaches a certain thickness, stop filtering and unload the material to obtain a fine iron powder filter cake. ; (iii) Maintenance of vacuum filter: A. In order to improve the filtering efficiency of the vacuum filter, it is necessary to regularly check the working status of the vacuum pump, including the integrity of the sealing ring, gas ballast valve gasket, air inlet, exhaust valve plate and other components. At the same time, it is necessary to regularly clean the sediment and impurities inside the vacuum pump to keep it unobstructed; B. The filter medium needs to be regularly sprayed and cleaned with a high-pressure water gun. At the same time, it is necessary to regularly check the wear of the filter medium and replace the filter medium that is severely worn; (iv) Wastewater treatment: The filtrate generated during the filtration process is discharged into the wastewater treatment system or reuse system through a pipeline for recycling and reuse. Embodiment six:

[0026] In the fifth embodiment, the following steps are added: Step 3: When maintaining the vacuum filter, it is necessary to perform maintenance every three months and establish equipment maintenance records to record the time, content and results of each maintenance and inspection.

[0027] (i) Preparation of slurry: First, the iron powder raw material is preliminarily screened through screening equipment, and then the screened iron powder raw material is collected, and then the collected iron powder raw material is poured into a mixer, and then a dispersant and water are added and heated and stirred evenly; (ii) Vacuum filtration: The prepared slurry is sent to a vacuum filter for filtration. The vacuum filter uses the negative pressure generated by the vacuum system to discharge the moisture in the iron ore concentrate slurry through the filter medium. As the vacuum filtration proceeds, the solid particles in the iron ore concentrate slurry gradually form a filter cake on the filter medium. When the filter cake reaches a certain thickness, stop filtering and unload the material to obtain a fine iron powder filter cake. ; (iii) Maintenance of vacuum filter: A. In order to improve the filtering efficiency of the vacuum filter, it is necessary to regularly check the working status of the vacuum pump, including the integrity of the sealing ring, gas ballast valve gasket, air inlet, exhaust valve plate and other components. At the same time, it is necessary to regularly clean the sediment and impurities inside the vacuum pump to keep it unobstructed; B. The filter medium needs to be regularly sprayed and cleaned with a high-pressure water gun. At the same time, it is necessary to regularly check the wear of the filter medium and replace the filter medium that is severely worn; (iv) Wastewater treatment: The filtrate generated during the filtration process is discharged into the wastewater treatment system or reuse system through a pipeline for recycling and reuse. Embodiment seven:

[0028] In the sixth embodiment, the following steps are added: The filter medium in step three is filtered using filter cloth, and the filter cloth is made of a suitable material according to the viscosity, acidity, alkalinity and abrasiveness of the material.

[0029] (i) Preparation of slurry: First, the iron powder raw material is preliminarily screened through screening equipment, and then the screened iron powder raw material is collected, and then the collected iron powder raw material is poured into a mixer, and then a dispersant and water are added and heated and stirred evenly; (ii) Vacuum filtration: The prepared slurry is sent to a vacuum filter for filtration. The vacuum filter uses the negative pressure generated by the vacuum system to discharge the moisture in the iron ore concentrate slurry through the filter medium. As the vacuum filtration proceeds, the solid particles in the iron ore concentrate slurry gradually form a filter cake on the filter medium. When the filter cake reaches a certain thickness, stop filtering and unload the material to obtain a fine iron powder filter cake. ; (iii) Maintenance of vacuum filter: A. In order to improve the filtering efficiency of the vacuum filter, it is necessary to regularly check the working status of the vacuum pump, including the integrity of the sealing ring, gas ballast valve gasket, air inlet, exhaust valve plate and other components. At the same time, it is necessary to regularly clean the sediment and impurities inside the vacuum pump to keep it unobstructed; B. The filter medium needs to be regularly sprayed and cleaned with a high-pressure water gun. At the same time, it is necessary to regularly check the wear of the filter medium and replace the filter medium that is severely worn; (iv) Wastewater treatment: The filtrate generated during the filtration process is discharged into the wastewater treatment system or reuse system through a pipeline for recycling and reuse. Embodiment eight:

[0030] In the seventh embodiment, the following steps are added: After the filter cloth in step three is replaced, the new filter cloth needs to be soaked and dried to improve its stability and filtering performance.

[0031] (i) Preparation of slurry: First, the iron powder raw material is preliminarily screened through screening equipment, and then the screened iron powder raw material is collected, and then the collected iron powder raw material is poured into a mixer, and then a dispersant and water are added and heated and stirred evenly; (ii) Vacuum filtration: The prepared slurry is sent to a vacuum filter for filtration. The vacuum filter uses the negative pressure generated by the vacuum system to discharge the moisture in the iron ore concentrate slurry through the filter medium. As the vacuum filtration proceeds, the solid particles in the iron ore concentrate slurry gradually form a filter cake on the filter medium. When the filter cake reaches a certain thickness, stop filtering and unload the material to obtain a fine iron powder filter cake. ; (iii) Maintenance of vacuum filter: A. In order to improve the filtering efficiency of the vacuum filter, it is necessary to regularly check the working status of the vacuum pump, including the integrity of the sealing ring, gas ballast valve gasket, air inlet, exhaust valve plate and other components. At the same time, it is necessary to regularly clean the sediment and impurities inside the vacuum pump to keep it unobstructed; B. The filter medium needs to be regularly sprayed and cleaned with a high-pressure water gun. At the same time, it is necessary to regularly check the wear of the filter medium and replace the filter medium that is severely worn; (iv) Wastewater treatment: The filtrate generated during the filtration process is discharged into the wastewater treatment system or reuse system through a pipeline for recycling and reuse.

[0032] 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 high-efficiency vacuum dehydration and filtration process for refined iron powder, characterized in that: The steps include:

1. Preparation of slurry: First, the iron powder raw material is preliminarily screened by screening equipment, and then the screened iron powder raw material is collected, and then the collected iron powder raw material is poured into a mixer, and then a dispersant and water are added and heated and stirred evenly; (ii) Vacuum filtration: The prepared slurry is sent to a vacuum filter for filtration. The vacuum filter uses the negative pressure generated by the vacuum system to discharge the water in the iron ore concentrate slurry through the filter medium. As the vacuum filtration proceeds, the solid particles in the iron ore concentrate slurry gradually form a filter cake on the filter medium. When the filter cake reaches a certain thickness, the filtration is stopped and the material is discharged to obtain a fine iron powder filter cake. (III) Maintenance of vacuum filter: A. In order to improve the filtration efficiency of the vacuum filter, it is necessary to regularly check the working status of the vacuum pump, including the integrity of the sealing ring, gas ballast valve gasket, air inlet, exhaust valve plate and other components. At the same time, it is necessary to regularly clean the sediment and impurities inside the vacuum pump to keep it unobstructed; B. The filter medium needs to be regularly cleaned by spraying with a high-pressure water gun. At the same time, the wear of the filter medium needs to be regularly checked, and the filter medium with severe wear needs to be replaced; 4. Wastewater treatment: The filtrate generated during the filtration process is discharged into the wastewater treatment system or reuse system through a pipeline for recycling.

2. The high-efficiency vacuum dehydration and filtration process for refined iron powder according to claim 1, characterized in that: In the step 1, when preparing the slurry, it is preferred to use iron powder raw materials with large and uniform particle size.

3. The high-efficiency vacuum dehydration and filtration process for refined iron powder according to claim 1, characterized in that: After the slurry in step 1 is prepared, its concentration is controlled at 350-400 g / L.

4. The high-efficiency vacuum dehydration and filtration process for refined iron powder according to claim 1, characterized in that: The temperature of the slurry in step 1 is controlled at 40-60° C. after preparation.

5. The high-efficiency vacuum dehydration and filtration process for refined iron powder according to claim 1, characterized in that: In the step 2, the vacuum degree is controlled between -0.06MPa and -0.08MPa during vacuum filtration, and the filter speed is controlled at 0.5-1.5r / min.

6. The high-efficiency vacuum dehydration and filtration process for refined iron powder according to claim 1, characterized in that: In the step three, the vacuum filter needs to be maintained every three months, and an equipment maintenance record should be established to record the time, content and results of each maintenance and overhaul.

7. The high-efficiency vacuum dehydration and filtration process for refined iron powder according to claim 1, characterized in that: The filter medium in step three is filtered using filter cloth, and the filter cloth is made of a suitable material according to the viscosity, acidity, alkalinity and abrasiveness of the material.

8. The high-efficiency vacuum dehydration and filtration process for refined iron powder according to claim 1, characterized in that: After the filter cloth in step three is replaced, the new filter cloth needs to be soaked and dried to improve its stability and filtering performance.