Method for recycling water in iron ore beneficiation

Abstract

The application discloses a method for recycling water in iron ore dressing, and is characterized by comprising the following eight steps.The method for recycling water in iron ore dressing has the advantages of no water discharge, reduced environmental pollution, improved water recycling efficiency, one-time investment transformation, recovery of steam condensate water, reduced production water purchase quantity, adoption of high-temperature equipment cooling water to flush a magnetic separator, improved concentrate recovery rate by 2.5%, reduced tailing metal rate by 1%, improved ore dressing production efficiency, annual reduction of production water purchase quantity by 500,000 tons, annual saving of production cost by 2,000,000 yuan, and suitability for ore dressing plants adopting a large production water consumption quantity, high cost and a magnetic separation method, recovery of equipment cooling water and steam condensate water, use of the recovered equipment cooling water and steam condensate water to flush the magnetic separator, improvement of the concentrate recovery rate, reduction of environmental humidity through recovery of steam waste heat to generate condensate water, improvement of the working environment quality of workers, satisfaction of production needs, reduction of production cost, reduction of production water purchase, realization of energy saving and emission reduction.

Description

Methods for recycling iron ore beneficiation water Technical Field

[0001] This invention relates to the field of mineral material processing technology, specifically a method for recycling water in iron ore beneficiation. Background Technology

[0002] my country is a country with severe water scarcity, and the spatial and temporal distribution is quite uneven, making development and utilization extremely difficult. There are several solutions to the water shortage problem: inter-basin water transfer, seawater desalination, and water recycling. The investment and annual operating costs required for water recycling are far lower than those required for long-distance water transfer and seawater desalination. Utilizing recycled water is a major way to improve the economic efficiency of enterprises, reduce pollution discharge, protect the environment, and prevent water pollution.

[0003] Most ores in my country have complex properties, long beneficiation processes, and large water consumption in production. The production water quota is about 4 tons per ton. Calculated at 4 yuan per ton of water, the annual water cost for producing 1 million tons of iron concentrate is 16 million yuan. Water costs account for a significant proportion of the costs of beneficiation plants. Establishing a scientific and reasonable beneficiation water supply system tailored to local conditions is an important measure for beneficiation plants to improve beneficiation indicators, reduce production costs, and increase the utilization rate of recycled water. It is of great significance for improving the comprehensive utilization rate of resources, establishing a circular economy model for beneficiation water, and enhancing the sustainable development capacity of beneficiation plants. Therefore, researching and formulating energy-saving and emission-reduction schemes for water supply systems has become an important issue for beneficiation plants. It is an important measure to improve the energy efficiency of beneficiation water supply and reduce beneficiation production costs, and plays an important role in establishing a high-efficiency circular economy model and enhancing the sustainable development capacity of enterprises.

[0004] For iron ore with fine, dense, and difficult-to-grind particles, a single weak magnetic separation process is usually used. During the production process, the ore is always kept in a slurry for processing, resulting in high water consumption. In order to reduce production water costs, this invention designs a method for recycling iron ore beneficiation water, recovering steam condensate and utilizing equipment cooling water to improve production efficiency, reduce water consumption, and save production costs. Summary of the Invention

[0005] The purpose of this invention is to provide a method for recycling iron ore beneficiation water to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for recycling iron ore beneficiation water, characterized by comprising the following eight steps:

[0008] Step 1: After the water resources enter the factory area, they are transported into a high-level water tank. The potential energy generated by the drop in elevation is used to transport the water to the production site, where it is delivered to the ball mill lubrication oil station and the ball mill bearings. The ball mill lubrication oil station is equipped with a heat exchanger. The water from the high-level water tank enters the heat exchanger and exchanges heat with the lubricating oil that returns to the oil station after lubricating the ball mill, thereby reducing the temperature of the lubricating oil. The lubricating oil is then returned to the oil tank of the oil station for recycling, and the cooling water enters the insulated water tank.

[0009] Step 2: The water in the high-level water tank enters the ball mill bearing cooling water channel to cool the bearing, reduce the bearing temperature, and extend the bearing service life. The cooling water flows in the cooling water channel, absorbs heat, and then flows out into the heat preservation water tank, where it merges with the cooling water of the lubricating oil station.

[0010] Step 3: The insulated water tank protects the cooling water from the lubricating oil and bearings, preventing heat loss and thus avoiding an increase in the temperature inside the plant that would affect the equipment's operating performance, and reducing corrosion of electrical equipment;

[0011] Step 4: The slurry in the concentrate tank is transported to a classifier for particle size classification. Qualified products enter the magnetic separator, while unqualified products are returned to the ball mill for grinding to reduce particle size.

[0012] Step 5: The slurry enters the ball mill for grinding to reduce particle size. During the grinding process, a large amount of energy is converted into heat energy. The weak magnetic separation adopts an overflow ball mill. The qualified iron ore slurry has a small particle size and floats on the upper layer of the slurry inside the ball mill cylinder. As the water flows out of the ball mill, it enters the next process. The iron ore slurry flows out of the ball mill and carries away most of the heat energy, which plays a role in reducing the temperature.

[0013] Step 6: After the ball mill grinds the ore, the fine-grained iron ore produced overflows with the slurry and enters the slurry tank. The slurry carries away a large amount of heat energy generated by the rotation of the ball mill, and the high temperature of the slurry generates a large amount of water vapor.

[0014] Step 7: The tailings slurry discharged from the magnetic separator flows into the thickener. Flocculant is added to the thickener to precipitate solids in the slurry. After filtration, the water flows into the water storage tank of the circulating water pump station.

[0015] Step 8: The wastewater from the employees' showers flows into the wastewater treatment tank through the sewer, and after sedimentation and filtration, it is recycled to the water storage tank of the circulating water pump station.

[0016] Furthermore, in step two, the lubricating oil and bearing cooling water are always supplied from a high-level water tank to ensure stable water pressure. There is no need to use a water pump for pressurization, which saves electricity. The water temperature in the high-level water tank is low and constant, resulting in good cooling effect. Direct use of water from the high-level water tank for cooling avoids the process of circulating water cooling and improves work efficiency.

[0017] Furthermore, in step three, the insulated water tank uses a water pump to pressurize and deliver water to the magnetic separator, washing away the iron powder adsorbed on the surface of the magnetic separator drum, washing it off, and letting it flow into the concentrate tank. The high-temperature water helps to accelerate the movement of the iron powder and reduce the amount of iron powder adsorbed on the surface of the magnetic drum, which then flows into the tailings tank with the inertial movement of the magnetic separator drum.

[0018] Furthermore, in step four, after the slurry entering the magnetic separator undergoes magnetic separation, the iron concentrate is separated and enters the concentrate tank, which is then sent to the concentrate pump to process the finished product for sale, while the tailings slurry flows into the thickener.

[0019] Furthermore, in step six, a cooling plate is installed on the slurry tank into which the overflow slurry from the ball mill flows. Stainless steel pipes are laid on the cooling plate, and domestic water is transported through the pipes. When the steam in the slurry tank encounters the cooling plate, the heat is conducted to the stainless steel pipes, forming condensate that drips back into the slurry tank under gravity. The domestic water in the stainless steel pipes carries away the heat and collects in the insulated water tank of the bathhouse for employees to use for bathing. This reduces the energy consumption of heating the bathhouse, saving approximately 1 million yuan annually. At the same time, it reduces the amount of steam emitted into the factory, protecting personal health and equipment safety. The cooling plate absorbs the steam and converts it into condensate, which is then recycled back into the slurry tank, reducing water resource loss.

[0020] Furthermore, in step eight, flocculants with molecular weights of 8 million, 12 million, and 16 million are used depending on the properties of the ore to ensure that the water purified by the thickener meets the standards, reduce production costs, and recycle water in the reservoir of the circulating water pump station. The water is then transported to the ball mill to adjust the slurry concentration inside the ball mill and transported to the slurry pool to prevent the slurry pool from being drained and to reduce slurry sedimentation.

[0021] Compared with existing technologies, the beneficial effects of this invention are as follows: This method for recycling iron ore beneficiation water eliminates external discharge, reduces environmental pollution, improves water recycling efficiency, requires only a one-time investment for renovation, recovers steam condensate, reduces the amount of fresh water purchased for production, uses high-temperature equipment cooling water to rinse the magnetic separator, increases concentrate recovery rate by 2.5%, reduces tailings metal content by 1%, improves beneficiation production efficiency, reduces annual production water purchases by 500,000 tons, and saves 2 million yuan in production costs annually. It is suitable for beneficiation plants that use magnetic separation methods with high production water consumption and costs. It recovers equipment cooling water and steam condensate for rinsing the magnetic separator, improving concentrate recovery rate. By recovering waste heat from steam to generate condensate, it reduces environmental humidity, improves the quality of the working environment for workers, meets production needs, reduces production costs, reduces the purchase of fresh water for production, and achieves energy conservation and emission reduction. Attached Figure Description

[0022] Figure 1 is a flowchart of the water recycling process of the present invention;

[0023] Figure 2 is a schematic diagram of the water circulation process of the present invention;

[0024] Figure 3 is a schematic diagram of the operation of the magnetic separator rinsing water according to the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] Example 1

[0029] Please refer to Figure 1. The embodiment provided by this invention: a method for recycling iron ore beneficiation water. The method for recycling iron ore beneficiation water is characterized by comprising the following eight steps:

[0030] Step 1: After the water resources enter the factory area, they are transported into the elevated water tank. The potential energy generated by the drop in elevation is used to transport the water to the production site, where it is delivered to the ball mill lubrication oil station and the ball mill bearings. The ball mill lubrication oil station is equipped with a heat exchanger. The water from the elevated water tank enters the heat exchanger and exchanges heat with the lubricating oil that returns to the oil station after lubricating the ball mill, thereby reducing the temperature of the lubricating oil. The lubricating oil is then returned to the oil tank of the oil station for recycling, while the cooling water enters the insulated water tank.

[0031] Step 2: Water from the high-level water tank enters the ball mill bearing cooling water channel to cool the bearing, reduce the bearing temperature, and extend the bearing service life. The cooling water flows in the cooling water channel, absorbs heat, and then flows out into the heat preservation water tank, where it merges with the cooling water from the lubrication oil station.

[0032] Step 3: The insulated water tank protects the cooling water from the lubricating oil and bearings, preventing heat loss and thus avoiding temperature rise in the factory that could affect equipment operation and reduce corrosion of electrical equipment.

[0033] Step 4: The slurry in the concentrate tank is transported to the classifier for particle size classification. Qualified products enter the magnetic separator, while unqualified products are returned to the ball mill for grinding to reduce particle size.

[0034] Step 5: The slurry enters the ball mill for grinding and particle size reduction. During the grinding process, a large amount of energy is converted into heat energy. The weak magnetic separation adopts an overflow ball mill. The qualified iron ore slurry has a small particle size and floats on the upper layer of the slurry inside the ball mill cylinder. As the water flows out of the ball mill, it enters the next process. The iron ore slurry flows out of the ball mill and carries away most of the heat energy, which plays a role in reducing the temperature.

[0035] Step 6: After the ball mill grinds the ore, the fine iron ore produced overflows with the slurry and enters the slurry tank. The slurry carries away a large amount of heat energy generated by the rotation of the ball mill, and the high temperature of the slurry produces a large amount of water vapor.

[0036] Step 7: The tailings slurry discharged from the magnetic separator flows into the thickener. Flocculant is added to the thickener to precipitate solids in the slurry. After filtration, the water flows into the storage tank of the circulating water pump station.

[0037] Step 8: Wastewater from employee showers flows into the wastewater treatment pond through the sewer. After sedimentation and filtration, it is recycled to the circulating water pump station's storage tank.

[0038] Furthermore, in step two, the lubricating oil and bearing cooling water are always supplied from a high-level water tank to ensure stable water pressure. There is no need to use a water pump for pressurization, which saves electricity. The water temperature in the high-level water tank is low and constant, resulting in good cooling effect. Direct use of water from the high-level water tank for cooling avoids the process of circulating water for cooling, thus improving work efficiency.

[0039] Furthermore, in step three, the insulated water tank uses a water pump to pressurize and deliver water to the magnetic separator, washing away the iron powder adsorbed on the surface of the magnetic separator drum, washing it off, and letting it flow into the concentrate tank. The high-temperature water helps to accelerate the movement of the iron powder and reduce the amount of iron powder adsorbed on the surface of the magnetic drum, which then flows into the tailings tank with the inertial movement of the magnetic separator drum.

[0040] Furthermore, in step four, after the slurry entering the magnetic separator undergoes magnetic separation, the iron concentrate is separated and enters the concentrate tank, which is then sent to the concentrate pump for processing into finished products for sale, while the tailings slurry flows into the thickener.

[0041] Furthermore, in step six, a cooling plate is installed on the slurry tank into which the ball mill overflows. Stainless steel pipes are laid on the cooling plate, and domestic water is transported through the pipes. When the steam in the slurry tank encounters the cooling plate, the heat is conducted to the stainless steel pipes, forming condensate that drips back into the slurry tank under gravity. The domestic water in the stainless steel pipes carries away the heat and collects in the insulated water tank of the bathhouse for employees to use for bathing. This reduces the energy consumption of the bathhouse heating system, saving approximately 1 million yuan annually. At the same time, it reduces the amount of steam emitted into the factory, protecting personal health and equipment safety. The cooling plate adsorbs the steam and converts it into condensate, which is then recycled back into the slurry tank, reducing water resource loss.

[0042] Furthermore, in step eight, flocculants with molecular weights of 8 million, 12 million, and 16 million are used depending on the properties of the ore to ensure that the water purified by the thickener meets the standards, reduce production costs, and recycle water in the reservoir of the circulating water pump station. The water is then transported to the ball mill to adjust the slurry concentration inside the ball mill and transported to the slurry pool to prevent the slurry pool from being drained and to reduce slurry sedimentation.

[0043] Example 2

[0044] By making a one-time investment in upgrading and recycling steam condensate, the amount of fresh water purchased for production is reduced. High-temperature equipment cooling water is used to rinse the magnetic separator, which increases the concentrate recovery rate by 2.5%, reduces the tailings metal content by 1%, and improves the efficiency of mineral processing. This reduces the annual amount of production water purchased by 500,000 tons and saves 2 million yuan in production costs annually. It is suitable for mineral processing plants that use magnetic separation methods with high production water consumption and costs. The recycled equipment cooling water and steam condensate are used to rinse the magnetic separator. The condensate generated by recovering the waste heat of steam reduces the ambient humidity and improves the quality of the working environment for workers. This approach meets production needs while reducing production costs and the purchase of fresh water, achieving energy conservation and emission reduction, reducing environmental pollution, and improving water recycling efficiency.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for recycling iron ore beneficiation water, characterized in that: The process includes the following eight steps: Step 1: After water enters the plant area, it is transported to an elevated water tank. Utilizing the potential energy generated by the drop in elevation, the water is transported to the production site, specifically to the ball mill lubrication station and the ball mill bearings. The ball mill lubrication station is equipped with a heat exchanger. Water from the elevated water tank enters the heat exchanger and exchanges heat with the lubricating oil returning to the oil station after lubrication, reducing the lubricating oil temperature. The lubricating oil is then returned to the oil tank for recycling, while the cooling water enters an insulated water tank. Step 2: The water from the elevated water tank enters the ball mill bearing cooling water channel to cool the bearings, reducing their temperature and extending their service life. The cooling water flows through the cooling water channel, absorbing heat before flowing out and entering the insulated water tank, where it merges with the cooling water from the lubrication station. Step 3: The insulated water tank protects the cooling water from the heat brought by the lubricating oil and bearings, preventing heat loss and thus reducing the temperature rise in the plant, which could affect equipment operation and reduce corrosion of electrical equipment. Step 4: The slurry in the concentrate bin is transported to the classifier... Particle size classification is performed. Qualified products enter the magnetic separator, while unqualified products are returned to the ball mill for grinding to reduce particle size. Step 5: The slurry enters the ball mill for grinding to reduce particle size. During the grinding process, a large amount of energy is converted into heat energy. Weak magnetic separation uses an overflow ball mill. Qualified iron ore slurry particles are small and float on the surface of the slurry inside the ball mill cylinder. As water flows out of the ball mill, it enters the next process. The iron ore slurry flowing out of the ball mill carries away most of the heat energy, thus reducing the temperature. Step 6: After the ball mill grinds the ore, the fine-grained iron ore overflows with the slurry and enters the slurry tank. The slurry carries away a large amount of heat energy generated by the rotation of the ball mill, and the high temperature of the slurry generates a large amount of water vapor. Step 7: The tailings slurry discharged from the magnetic separator flows into the thickener. Flocculant is added to the thickener to precipitate solid materials in the slurry. After filtration, the water flows into the storage tank of the circulating water pump station. Step 8: The sewage from the employees' showers flows into the sewage treatment tank through the sewer. After sedimentation and filtration, it is recycled to the storage tank of the circulating water pump station.

2. The method for recycling iron ore beneficiation water according to claim 1, characterized in that: In step two, the lubricating oil and bearing cooling water are always supplied from a high-level water tank to ensure stable water pressure. There is no need to use a water pump for pressurization, which saves electricity. The water temperature in the high-level water tank is low and constant, resulting in good cooling effect. Direct use of water from the high-level water tank for cooling avoids the process of circulating water for cooling, thus improving work efficiency.

3. The method for recycling iron ore beneficiation water according to claim 1, characterized in that: In step three, the insulated water tank uses a water pump to pressurize and deliver water to the magnetic separator, washing away the iron powder adsorbed on the surface of the magnetic separator drum and washing it off, which then flows into the concentrate tank.

4. The method for recycling iron ore beneficiation water according to claim 1, characterized in that: In step four, the slurry entering the magnetic separator undergoes magnetic separation. The iron concentrate is then separated and enters the concentrate tank, which is then sent to the concentrate pump for processing into finished products for sale. The tailings slurry flows into the thickener.

5. The method for recycling iron ore beneficiation water according to claim 1, characterized in that: In step six, a cooling plate is installed on the slurry tank into which the ball mill overflows. Stainless steel pipes are laid on the cooling plate, and domestic water is transported in the pipes. When the steam in the slurry tank encounters the cooling plate, the heat is conducted to the stainless steel pipes, forming condensate that drips back into the slurry tank under gravity. The domestic water in the stainless steel pipes carries away the heat and collects in the insulated water tank of the bathhouse for employees to use for bathing.

6. The method for recycling iron ore beneficiation water according to claim 1, characterized in that: In step eight, flocculants with molecular weights of 8 million, 12 million, and 16 million are used depending on the properties of the ore to ensure that the water purified by the thickener meets the standards, reduce production costs, and recycle the water in the storage tank of the circulating water pump station. The water is then transported to the ball mill to adjust the slurry concentration inside the ball mill and then transported to the slurry tank.

Images