A process for treating tailings water

Abstract

The application provides a tailing water treatment process, (1) crushing the tailings and screening out the mineral powder meeting the particle size requirement; (2) adding the mineral powder and water into a homogenizing tank according to the proportion adjusted, and the slag is settled at the bottom; (3) the mixed solution is sent into a membrane tank, the solution is washed and filtered through a filtering system, the filtered slag is settled at the bottom of the membrane tank, and the produced solution is discharged to a temporary storage tank; (4) the slag at the bottom of the homogenizing tank and the membrane tank is discharged to a filter press through a concentration discharging system, the slag is filtered through the filter press, the filtered solution is discharged to the homogenizing tank for repeated use, and the filtered slag is discharged and collected; (5) the concentration of the solution collected in the temporary storage tank is monitored by the system, if the concentration does not reach the standard, the solution is discharged back to the homogenizing tank and new mineral powder is added for mixing, and the steps (2) to (4) are repeated until the concentration of the solution in the temporary storage tank reaches the standard, then the solution in the temporary storage tank is discharged to a storage tank for collection, and the design has the advantages of low cost and good environmental protection effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tailing water washing, in particular to a tailing water treatment process. BACKGROUND

[0002] With the intensification of mining, the cost of tailing treatment and the increasing requirements of environmental disposal, the stockpiling of tailings produced by ore dressing also increases. However, the development of tailings disposal is quite lagging behind. Today, with the increasing pollution of solid waste and the deterioration of water environment, the treatment system for safe and standard disposal of tailings is incomplete and cannot meet the requirements of cost, environmental protection and environmental goals.

[0003] At present, most of the mirabilite production plants produce according to waste, and the tailings treatment selects multi-stage water washing + chemical flocculation and sedimentation treatment process. Although the treatment technology is mature, the disposal process is complex, the fixed investment and disposal cost is very high, and secondary pollution is caused. Therefore, it is urgent to economically and safely solve the problem of tailings disposal. SUMMARY

[0004] The purpose of the present application is to provide a tailing water treatment process using physical treatment method to treat tailings by water to solve the problems mentioned in the background.

[0005] In order to achieve the above purpose, the present application provides the following technical scheme:

[0006] A tailing water treatment process, characterized in that it comprises the following steps:

[0007] Step one: crushing, using a crusher or a pulverizer to crush the tailings and screening out the ore powder meeting the particle size requirements;

[0008] Step two: water washing and homogenization, adding the ore powder and water into the homogenization tank according to the adjusted ratio, stirring and mixing homogenization treatment, and the slag in the homogenization tank sinks to the bottom;

[0009] Step three: physical filtration and separation, the mixed solution is sent into the membrane tank, the solution is washed and filtered by the filtration system to realize solid-liquid separation, the filtered slag sinks to the bottom of the membrane tank, and the solution produced after filtration is discharged to the temporary storage tank;

[0010] Step four: concentration discharge and pressure filtration separation, the slag at the bottom of the homogenization tank and the membrane tank is discharged to the pressure filter through the concentration discharge system, the slag is pressure filtered by the pressure filter, the pressure filtration solution after pressure filtration is discharged to the homogenization tank for repeated use, and the slag after pressure filtration is discharged and collected as standard tailings;

[0011] Step five: the solution in the temporary storage pool is circulated, the concentration of the solution collected in the temporary storage pool is monitored by the system, if the concentration is not up to the standard, the solution is discharged back to the homogenizing pool and new mineral powder is added for mixing, steps two to four are repeated until the concentration of the solution in the temporary storage pool reaches the standard, then the solution in the temporary storage pool is discharged to the storage pool for collection.

[0012] Further to the description of the application, the homogenizing pool, the membrane pool and the temporary storage pool are arranged in sequence from left to right, wherein the bottom of the homogenizing pool and the membrane pool is a conical bottom structure, the bottom of the conical bottom is connected with a screw discharge device, and the conical bottom is further provided with a concentration discharge valve, after the concentration discharge valve is opened, the slag accumulated at the conical bottom position of the homogenizing pool and the membrane pool falls into the screw discharge device and is discharged to the filter press through the screw discharge device.

[0013] Further to the description of the application, the upper part of the homogenizing pool near one side of the membrane pool is provided with an overflow valve, after the overflow valve is opened, the supernatant of the homogenizing pool overflows into the membrane pool.

[0014] Further to the description of the application, the homogenizing pool is provided with a stirring motor, a rotating shaft is installed on the power output end of the stirring motor, a stirring paddle is installed on the rotating shaft at the middle position of the homogenizing pool, and a mud scraping plate is installed on the rotating shaft at the conical bottom position.

[0015] Further to the description of the application, the temporary storage pool is connected to the homogenizing pool through a reflux pipeline and a pump body.

[0016] The application has the following beneficial effects:

[0017] The design makes the tailing slag environmentally friendly by physical filtration, without adding chemical agents such as flocculants and coagulants, and changes the harmful solid waste generated by chemical water washing into general fixed waste generated by the method, and the physical water washing process of the scheme is simple, and the comprehensive operation cost and input cost are lower than the comprehensive cost of chemical agent three-stage water washing treatment, and the tailing slag after water washing can be used for synthesizing sand, curing agent or water stable material and other products. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a conventional mirabilite tailing chemical three-stage water washing process flowchart;

[0019] Figure 2 is a process flowchart of the application;

[0020] Figure 3 is a structure diagram of the homogenizing pool, the membrane pool and the temporary storage pool of the application. DETAILED DESCRIPTION

[0021] The application will be further described below in combination with the drawings:

[0022] As Figure 1As shown, the conventional chemical three-stage mirabilite tailings washing process is adopted, which requires the use of flocculants and coagulants multiple times, and multiple pressure filtration and washing. The overall process is complicated, and the addition of chemical agents causes pollution of the tailings slag, making it unusable for reuse. The overall process cost is also high.

[0023] like Figures 2-3 As shown, this design discloses a tailings water treatment process, taking the washing and purification of sodium sulfate solution from mirabilite tailings as an example, including the following steps:

[0024] Step 1: Crushing. Use a crusher or pulverizer to crush the mirabilite tailings and screen out the mineral powder that meets the particle size requirements. Screening is done using a screening machine.

[0025] Step 2: Water washing and homogenization. Add mineral powder and water to homogenization tank 1 according to the adjusted ratio and stir to mix and homogenize. The slag in homogenization tank 1 settles to the bottom. The adjusted mixing ratio ensures that the dissolution rate of sodium sulfate remains unchanged. Water washing and homogenization are carried out according to this ratio. In this design, the ratio of mirabilite tailings to water is 1:6.

[0026] Step 3: Physical filtration and separation. The mixed solution is sent into membrane tank 2 and the solution is washed and filtered by the filtration system to achieve solid-liquid separation. The filtered slag settles to the bottom of membrane tank 2, and the sodium sulfate solution produced after filtration is discharged to temporary storage tank 3.

[0027] Step 4: Concentration removal and filter press separation. The slag at the bottom of the homogenization tank 1 and membrane tank 2 is discharged to the filter press through the concentration removal system. The slag is filtered by the filter press. The filtrate after filtration is discharged to the homogenization tank 1 for reuse, while the slag after filtration is the qualified tailings slag discharged and collected.

[0028] Step 5: Circulate the solution in temporary storage tank 3. The concentration of sodium sulfate solution collected in temporary storage tank 3 is monitored by the system to see if it meets the standard. If it does not meet the standard, it is discharged back to homogenization tank 1 and new mineral powder is added for mixing. Repeat steps 2 to 4 until the concentration of sodium sulfate solution in temporary storage tank 3 reaches about 17%. Then, all the sodium sulfate solution in temporary storage tank 3 is discharged to the storage tank for collection.

[0029] Then, a certain amount of tailings is added and a new water ratio is added, repeating steps three to five to achieve automated and continuous water washing of the mirabilite tailings.

[0030] The homogeneous pool 1, the membrane pool 2 and the temporary storage pool 3 are sequentially arranged from left to right, wherein the bottom of the homogeneous pool 1 and the membrane pool 2 is a conical bottom 4 structure, the bottom of the conical bottom 4 is connected with a screw discharge device 5, the screw discharge device 5 is a concentration discharge system, the conical bottom 4 is also provided with a concentration valve 6, after the concentration valve 6 is opened, the slag accumulated at the position of the conical bottom 4 of the homogeneous pool 1 and the membrane pool 2 falls into the screw discharge device 5 and is discharged to the filter press through the screw discharge device 5, by arranging the conical bottom 4 structure at the bottom of the homogeneous pool 1 and the membrane pool 2, the sedimentation of the slag is facilitated, the slag is deposited at the position of the conical bottom 4, after a certain amount is reached, the concentration valve 6 is opened, and the slag is discharged by the screw discharge device 5, in the design, the temporary storage pool 3 is also provided with a conical bottom 4 and a concentration valve 6, and the outer frame structure of the homogeneous pool 1 and the membrane pool 2 is the same, and the production is convenient, and the temporary storage pool 3 is not provided with slag, and the concentration valve 6 is normally closed.

[0031] The upper part of the homogeneous pool 1 close to one side of the membrane pool 2 is provided with an overflow valve 7, after the overflow valve 7 is opened, the upper clear liquid of the homogeneous pool 1 overflows into the membrane pool 2, and a pump is not needed for conveying.

[0032] The homogeneous pool 1 is provided with a stirring motor 81, a rotating shaft 82 is installed on the power output end of the stirring motor 81, a stirring paddle 83 is installed on the rotating shaft 82 at the middle position of the homogeneous pool 1, and a mud scraping plate 84 is installed on the rotating shaft 82 at the position of the conical bottom 4, the stirring paddle 83 is used for mixing and stirring the solution, since the slag deposited in the homogeneous pool 1 is the most, the mud scraping plate 84 is arranged for scraping the slag at the position of the conical bottom 4, so that the slag cannot be detached from the inner wall of the conical bottom 4.

[0033] The temporary storage pool 3 is connected to the homogeneous pool 1 through a reflux pipe 31 and a pump body 32.

[0034] The above description does not limit the technical scope of the present application in any way, and any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still belong to the technical solution range of the present application.

Claims

1. A process for treating tailings water, characterized in that: The method comprises the following steps, Step one: crushing, using a crusher or pulverizer to crush the tailings and screen out the mineral powder meeting the particle size requirements; Step two: water washing, mixing and homogenizing, adding the mineral powder and water into the homogenizing tank according to the adjusted proportion, stirring, mixing and homogenizing, and allowing the slag to sink to the bottom of the homogenizing tank; Step three: physical filtration and separation, sending the mixed solution into the membrane tank, washing and filtering the solution through the filtration system to realize solid-liquid separation, allowing the filtered slag to sink to the bottom of the membrane tank, and discharging the filtered solution to the temporary storage tank; Step four: concentration discharge and pressure filtration separation, discharging the slag at the bottom of the homogenizing tank and the membrane tank to the pressure filter through the concentration discharge system, filtering the slag through the pressure filter, discharging the pressure filtration solution to the homogenizing tank for repeated use, and discharging the filtered slag as the qualified tailings for collection; Step five: temporary storage tank solution circulation, monitoring whether the concentration of the collected solution in the temporary storage tank meets the standard, discharging it back to the homogenizing tank and adding new mineral powder for mixing if it does not meet the standard, repeating steps two to four until the concentration of the solution in the temporary storage tank meets the standard, and then discharging all the solution in the temporary storage tank to the storage tank for collection.

2. A tailings water treatment process according to claim 1, characterised in that: The homogenizing tank, the membrane tank and the temporary storage tank are arranged from left to right, wherein the bottoms of the homogenizing tank and the membrane tank are conical, the bottom of the cone is connected with a screw discharge device, and the cone has a concentration discharge valve, when the concentration discharge valve is opened, the slag accumulated at the conical bottom of the homogenizing tank and the membrane tank falls into the screw discharge device and is discharged to the pressure filter through the screw discharge device.

3. A tailings water treatment process according to claim 2, characterised in that: The upper part of the homogenizing tank near the membrane tank has an overflow valve, when the overflow valve is opened, the supernatant of the homogenizing tank overflows into the membrane tank.

4. A tailings water treatment process according to claim 2, characterised in that: The homogenizing tank is provided with a stirring motor, a rotating shaft is installed on the power output end of the stirring motor, a stirring paddle is installed on the rotating shaft at the upper middle position of the homogenizing tank, and a mud scraping plate is installed on the rotating shaft at the conical bottom position.

5. A tailings water treatment process according to claim 1, characterised in that: The temporary storage tank is connected to the homogenizing tank through a reflux pipeline and a pump body.

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