CN111822158A

CN111822158A - Process for constructing tailing dam by using cyclone

Info

Publication number: CN111822158A
Application number: CN201910296748.3A
Authority: CN
Inventors: 史欣; 关翔; 顾新华
Original assignee: Baosteel Group Xinjiang Bayi Iron and Steel Co Ltd
Current assignee: Baosteel Group Xinjiang Bayi Iron and Steel Co Ltd
Priority date: 2019-04-14
Filing date: 2019-04-14
Publication date: 2020-10-27

Abstract

The invention discloses a process for constructing a tailing dam by using a cyclone, wherein tailings enter a 24-meter concentration tank, after high-efficiency concentration, the underflow enters a cyclone group, overflow water enters a circulating water tank, underflow pulp entering the cyclone has the concentration of about 35 percent, settled sand is used for constructing the dam under the action of centrifugal force, and water is pumped back to the circulating water tank for recycling by using a pontoon pump after the overflow enters a reservoir area and is precipitated; wherein the device uses and technical parameters: processing capacity: 40-60 m/h; feeding pressure: 0.08-0.15 MPA; the sediment concentration: more than or equal to 85 percent; feeding concentration: 30% -35%; separation granularity: 40-100 mu m, the ore pulp enters the shell through the ore feeding pipe under the action of pressure along the tangential direction of the cylinder and makes rotary motion in the shell, coarse particles or particles with large density in the ore pulp enter the periphery of the rotary flow due to large centrifugal force and flow downwards along with the ore pulp flow, and finally the ore pulp is discharged from a bottom sand settling nozzle to form settled sand; the fine particles are subjected to smaller centrifugal force, are positioned in the center of the revolving flow and move upwards along with the liquid flow, and are finally discharged by the overflow pipe to become overflow.

Description

Process for constructing tailing dam by using cyclone

Technical Field

The invention relates to a process for constructing a tailing dam by using a cyclone.

Background

According to the requirement of the environment-friendly hall of the Uygur autonomous region of Xinjiang on the seepage-proofing treatment of the safe reservoir region, the tailing reservoir of the concentrating mill is additionally provided with seepage-proofing facilities, the existing sedimentary beach surfaces and surrounding mountains of the tailing reservoir region are respectively provided with seepage-proofing facilities, the seepage-proofing facilities adopt a mode of laying geomembranes, and the mountains below the existing tailing accumulation elevation and the tailing leachate already accumulated in the reservoir region are prevented from seepage through the seepage-proofing facilities below the dam, so that the seepage-proofing of the whole reservoir region of the reservoir region and the surrounding mountains is realized. The elevation of the dam top of the initial dam is 2820.0m, the elevation of the dam bottom of the initial dam is 2798.0m, the elevation of the initial dam is 22.0m, and the length of the dam is 452.0 m. The upstream slope of the initial dam is 1:2.0, the downstream slope is 1:2.5, and the width of the top of the dam is 6.0 m. Because the whole reservoir area is seepage-proof, the infiltration line of the later dam can be obviously raised, in order to ensure the safety of the dam body, a seepage drainage facility is additionally arranged at the 2820.00 elevation, and the seepage is led out through a seepage drainage blind ditch and a diversion pipe to lead to a water return pool and is returned to a factory for recycling. When the tailing dam is in the middle of accumulation use, the bottom of the dam body is deposited with a large amount of tailings, the capacity of a reservoir area is reduced, and normal production of mineral separation cannot be met, so that a sub-dam needs to be built.

The secondary damming is manually matched with a loader and an excavator, so that the cost is high, the operating condition is severe, and the efficiency is low; in the dam built manually, a multi-level fine mud horizontal interlayer is formed in the dam body, so that the dam body is unstable.

Disclosure of Invention

The invention aims to provide a process for constructing a tailing dam by using a cyclone, which can improve the structure of the dam, improve the stability of the dam, reduce the labor intensity, reduce the damming cost, improve the working condition and provide guarantee for the continuous production of ore dressing and the safety of a tailing pond.

The purpose of the invention is realized as follows: a process for building tailings dam by using a cyclone comprises the steps that tailings enter a 24-meter concentration tank, after high-efficiency concentration, the underflow enters a cyclone group, overflow water enters a circulating water tank, underflow pulp entering the cyclone has the concentration of about 35%, settled sand is used for building dam under the action of centrifugal force, and overflow enters a storage area, is deposited and then is pumped back to the circulating water tank by using a pontoon pump for recycling; wherein the device uses and technical parameters: processing capacity: 40-60 m/h; feeding pressure: 0.08-0.15 MPA; the sediment concentration: more than or equal to 85 percent; feeding concentration: 30% -35%; separation granularity: 40-100 mu m; the process comprises the following operation key points: under the action of pressure, ore pulp enters the shell along the tangential direction of the cylinder through the ore feeding pipe and performs rotary motion in the shell, coarse particles or particles with large density in the ore pulp enter the periphery of a rotary flow due to large centrifugal force, and flow downwards along with the ore pulp flow, and are finally discharged by a bottom sand settling nozzle to form settled sand; the fine particles are subjected to smaller centrifugal force, are positioned in the center of the revolving flow and move upwards along with the liquid flow, and are finally discharged by the overflow pipe to become overflow.

The later dam of the tailing pond is built by adopting 'upstream' tailings, the tailings are used for heightening on the initial earth-rock dam, and the granularity of the tailings is screened out, which is shown in the following table:

as can be seen from the above table, the tailing particle size of +0.074mm accounts for 36.23%, and the average tailing particle size d is calculated_pThe grain size of the tailings is not less than 0.068mm, the content of the grain size of the tailings plus 0.037mm can reach 64.7 percent, and the discharge concentration of the tailings is 35 percent, so that the tailings are adopted for damming without problems.

The technical principle of the invention is as follows: classifying the tailing pulp by using a hydrocyclone, and using high-concentration coarse-particle tailings discharged by a sand settling nozzle for damming; and discharging the low-concentration fine particle tailing slurry discharged from the overflow port into a reservoir area for sedimentation. Wherein the feeding pressure of the cyclone is more than 0.15 MPA. The bracket is arranged at each certain interval along the top of the dam, the swirler is arranged on the bracket, the water in the tailing pulp of high-concentration coarse-grain tailings in the stacking process is settled under the action of gravity, the tailings sand flows into a reservoir area along with an overflow pipe arranged in the dam body, and the tailings sand is settled and compacted under the action of gravity and water power, and the formed dam body is compact and stable due to the fact that the tailings sand is thick and the particle size distribution is uniform. The height of the sub-dam is 5.0m in each period, and the slope outside the sub-dam is 1: 3, a platform is arranged every 5.0m high, so that the transportation and the maintenance of a tailing dam are facilitated, and the platform width is 10.0 m. Average slope 1 of tailing fill dam: 5.

the invention adopts the swirler to build the dam, the structure is simple, and the monthly manual and mechanical dam building cost is 4 ten thousand yuan. After the cyclone dam is built, the monthly fee of the cyclone dam is = the material depreciation fee + the maintenance fee is =0.3 ten thousand yuan. The annual cost saving is 44.4 ten thousand yuan.

Drawings

The invention is further described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of the beneficiation process.

Detailed Description

A process for building tailings dam by using a cyclone is disclosed, as shown in figure 1, tailings enter a 24-meter concentration tank, after high-efficiency concentration, the underflow enters a cyclone group, overflow water enters a circulating water tank, underflow pulp entering the cyclone has the concentration of about 35%, settled sand is used for building dam under the action of centrifugal force, and water is pumped back to the circulating water tank for recycling after overflowing into a reservoir area and being precipitated by using a pontoon pump; wherein the device uses and technical parameters: processing capacity: 40-60 m/h; feeding pressure: 0.08-0.15 MPA; the sediment concentration: more than or equal to 85 percent; feeding concentration: 30% -35%; separation granularity: 40-100 mu m; the process comprises the following operation key points: under the action of pressure, ore pulp enters the shell along the tangential direction of the cylinder through the ore feeding pipe and performs rotary motion in the shell, coarse particles or particles with large density in the ore pulp enter the periphery of a rotary flow due to large centrifugal force, and flow downwards along with the ore pulp flow, and are finally discharged by a bottom sand settling nozzle to form settled sand; the fine particles are subjected to smaller centrifugal force, are positioned in the center of the revolving flow and move upwards along with the liquid flow, and are finally discharged by the overflow pipe to become overflow.

The process has the following operation key points: the requirements for sub-dams and side slopes: the height of the sub-dam is 5.0m in each period, and the slope outside the sub-dam is 1: 3, a platform is arranged every 5.0m high, so that the transportation and the maintenance of a tailing dam are facilitated, and the platform width is 10.0 m. Average slope 1 of tailing fill dam: 5. 2) concentration of bottom flow of the 24-meter concentration tank: the 24m underflow conveying concentration is kept between 35 and 40 percent and is conveyed to the cyclone under the pressure of 0.15MPA, and the settled sand concentration is ensured to be more than or equal to 85 percent for damming. The technology selects the type of the high-efficiency swirler: FX 250-GT; the manufacturer: wehai city Haiwang cyclone Co.

Claims

1. A process for constructing a tailing dam by using a cyclone is characterized by comprising the following steps: tailings enter a 24-meter concentration tank, after high-efficiency concentration, the underflow enters a cyclone group, overflow water enters a circulating water tank, underflow pulp entering the cyclone has the concentration of about 35 percent, settled sand is used for building a dam under the action of centrifugal force, and overflow enters a storage area, is deposited and then is pumped back to the circulating water tank by a pontoon pump for recycling; wherein the device uses and technical parameters: processing capacity: 40-60 m/h; feeding pressure: 0.08-0.15 MPA; the sediment concentration: more than or equal to 85 percent; feeding concentration: 30% -35%; separation granularity: 40-100 mu m; the process comprises the following operation key points: under the action of pressure, ore pulp enters the shell along the tangential direction of the cylinder through the ore feeding pipe and performs rotary motion in the shell, coarse particles or particles with large density in the ore pulp enter the periphery of a rotary flow due to large centrifugal force, and flow downwards along with the ore pulp flow, and are finally discharged by a bottom sand settling nozzle to form settled sand; the fine particles are subjected to smaller centrifugal force, are positioned in the center of the revolving flow and move upwards along with the liquid flow, and are finally discharged by the overflow pipe to become overflow.