Application Research of Graded Tailings Cement Filling in Wushan Copper Mine

O Introduction

Wushan Copper Mine since 1990. With a layered approach water sand filling method, without the addition of cementitious material. In 2004, Wushan Copper Mine cooperated with Changsha Mine Institute to rebuild a cementation filling process system in the filling station of Wushan Village in the South Mine Belt. The cementing filling test was carried out in the south mine belt W4 and W5, and the filling concentration reached about 68%. . After according to "Wushan Copper Mine in the overall production capacity optimization," and the 2004 China Nonferrous Engineering and Research Institute to do, "Jiangxi Copper Company Limited Wushan Copper Mine Potential 2002 Nanchang Nonferrous Metallurgy Design and Research Institute made Design of the preliminary design of the expansion of technical transformation. The northern ore belt of Wushan Copper Mine adopts graded tailings cementation filling method.

In 2007, the infrastructure work of the cement filling station in the North Mine of Wushan Copper Mine was completed. In October of the same year, the E4 panel of the North Mine Belt was the first test panel for the sub-step and phase-by-step pass-through tests, along with the cross-filling process. The advancement of the surface cementing filling station has been through continuous production practice and scientific research. At present, the weight concentration of the slurry has reached 65% to 72%, and good results have been achieved. At the end of 2008, there were 15 panels in the North Belt of Wushan Copper Mine for cementation filling, and the yield capacity of the stope was greatly improved.

1 皎 knot filling system

The cement filling and filling system of the North Mine is composed of ground facilities (plant equipment, instruments, etc.) and underground conveying pipelines. The layout of the cementing filling station is arranged in a single-stage manner, and the vertical silo, cement silo and feeding gauge are arranged from top to bottom. , metering devices, mixing equipment, pipelines, mining sites. The filling process is shown in Figure 1.

1 a full tail pump pool; 2 a slurry pump; 3 a vertical sand bunker; 4 a graded cyclone; 5 an electric hose valve 6 a flow meter; 7 a nuclear radiation concentration meter 8 a manual gate valve; 9-mixing bucket; 10-flushing flowmeter; 11-double-tube screwing machine; 12-cement silo; 13-alum

Figure 1 Schematic diagram of the filling process

Fig. 1 Sketch map 0f(3emented Filling flow chart

1. Control of graded tailings feeding system

The feed of the graded tailings is 20%~30% by weight of the beneficiation . The whole tail is transported to the FX500-Pu×6 graded cyclone through the DN450 ceramic tube through the 200ZJA-I-A70 slurry pump. After classification, it is stored in 1 000 m. . Vertical sand silo. The graded tailings cementing filling system requires that the tailings are supplied at a weight concentration of more than 60%. The concentration fluctuation of the graded tailings slurry directly affects the preparation concentration of the filling slurry. The pulping concentration of the tailings is controlled by the pulping high-pressure wind and high-pressure water distributed at the bottom of the vertical silo. The tailings slurry is controlled according to the needs of filling the stope and the height of the silo.

The control of the uniform tailing sand supply amount is controlled by the computer according to the tailing sand concentration and flow rate through the switch degree of the electric actuator. The graded tail sand passes through the 锲-type flowmeter and the nuclear radiation concentration meter, and the self-flow tail is separately measured. The amount of sand and the concentration of tailings are fed into the high-efficiency mixing tank.

1,2 control of cement feeding system

The cemented filling cement material of Wushan Copper Mine is mainly bulk P. () 42.5 Portland cement, mainly relying on tank cars to transport cement through the DNl24 pipeline to the filling station 200 m. The cement silo and the cement are evenly fed by the LE250×3000 double-tube screw feeder at the bottom of the cement silo, and the punching flowmeter is metered and then falls into the mixing tank. The double pipe screw feeder is controlled by the frequency converter according to the set sand amount.

1,3 filling slurry preparation system

The main raw materials for the preparation of slurry filling are graded tailings and cement, which are completed by a 45 kw motor dragging 100×2 000 high-efficiency mixing tank equipment. The more fully stirred, the more uniform the slurry. If the agitation is not uniform, it will not only reduce the strength of the filling body, but also affect the smooth transportation of the filling slurry and even cause pipeline blockage accidents.

The control of the flow rate of the mixing tank is adjusted by the computer according to the liquid level of the mixing drum and the degree of switching of the electric actuator, so as to ensure that the liquid level of the mixing tank is about 0.9-1.2 m to ensure sufficient mixing of the slurry. Liquid level. At the same time, the flow meter and density meter are installed on the pipeline of the mixing barrel DNl33, and the slurry flow rate and concentration are detected. The slurry concentration is 65%~72%.

1, 4 filling process detection system

The metering and testing instruments of the cement strip filling station in the North Mine mainly include cement scale (flushing flowmeter), tailing sand flowmeter (锲 type flowmeter), concentration meter (nuclear radiation concentration meter), and liquid level (level) measurement.

1) Cement flow measurement

Cement is an important cementing material for cementation filling production, which directly affects the filling cost and filling quality, so its accuracy is particularly important. The North Mine Belt Cementing Station uses the DE10 sensor and the MT2106 converter-type punching plate flow meter to measure, and outputs a standard analog signal through the assembler in the converter, and enters the main control room corresponding to the actual flow rate of 0% to 100%. The punching flowmeter has a measuring range of 0 to 40 t/h and an accuracy of ±1%.

2) Classification tailings flow measurement

The graded tailings with uniform sand silo pulping have the characteristics of high concentration, fast flow rate and many minerals. Currently the north mineralized belt cemented filling stations out of flow measurement by self-exploration, electromagnetic flowmeters previous design, but due to our mine tailings with high iron (9.8%), during the run flow fluctuations, the measurement is not accurate. After that, according to the characteristics of mine tailings, I made a custom-made 锲-type flowmeter. The main principle is to generate differential pressure through the 锲-shaped part, which is detected by the differential pressure transmitter, and the output current is proportional to the square root of the flow value. mADC. The 流量计 type flowmeter has a measuring range of 0 to 160 m/h and an accuracy of 0.5. From the current operation effect, the flowmeter is stable and reliable in operation and accurate in measurement.

3) Slurry concentration measurement

At present, the concentration measurement of cement filling station in North Mine is mainly based on AMDEL. The nuclear radiation densitometer is mainly used for the concentration of tailing sand in the vertical silo and the slurry concentration in the outlet of the mixing drum. The measuring principle is as follows: according to the r-ray passing through the measured medium, the ray intensity of the measured medium is attenuated according to the law, and the detector receives the strong signal of the ray to the microcomputer for processing, and the microcomputer calculates the density of the material according to the density value. The concentration of the material is calculated, and then the density value is converted to a standard analog signal output to the main control room.

The measurement accuracy is 0.002 to 0.0005 g/cm3. The density measurement range is 0.5 to 8 g/cm3.

4) Level (level) measurement

At present, the main instruments for measuring the liquid level (material) of the cement filling station in the North Mine are:

7Mu200AE00 Siemens ultrasonic level gauge for measuring the mixing tank;

In the past, the vertical sand bin level was measured with a heavy hammer level gauge. However, since the heavy hammer gauge gauge belt needs to be frequently immersed in the tailings during operation, it is easy to cause corrosion and fracture of the steel strip, causing blockage of the steel strip and cone. The vertical sand bin is opened, and the P0CUS200 integrated ultrasonic level gauge is used after technical transformation. The effect is ideal.

The design uses the radar level gauge to measure the cement silo, but because the radar level gauge is easily affected by the air pressure (the cement silo cement transport mode tanker enters by pressure), and the radar level gauge detection port is easily attached by the cement, resulting in the material level. The response is inaccurate, and the use of heavy hammer level gauges is currently being improved.

The liquid level (material) is an important parameter of the filling process, which directly guides the production, provides great help to the production, and reduces the operation difficulty of the frontline employees.

1, 5 control system

The North Mine Belt Cementation Filling Station uses GE's DCS control system. The system requires that the tailings and cement with uniform pulping are continuously and evenly transported into the mixing tank according to a certain ratio. The slurry prepared after mixing is self-flowed to the underground through the DNl33 pipeline without differential force. Fill the underground stope.

The ratio of lime to sand is 1:4 (one ton of cement four tons of tailings), 1:8 (one ton of cement eight tons of tailings); the range is adjustable; the slurry mass concentration: 55%~72%; Adjustment; mixing tank liquid level: 0.9 ~ 1.2m: slurry flow: 80 ~ 120 m3 / h.

The control system has better control functions, good man-machine interface, stable system operation, advanced instrument and control system, and the main parameters such as the ratio of various materials and the concentration of slurry are effectively controlled to ensure the mine. Stable operation of the filling production process can meet the needs of production.

2 Conclusion

Since the cement filling process was promoted and used in the northern ore belt of Wushan Copper Mine at the end of 2007, according to the practice mode, technical improvement has been continuously carried out, and the graded tailings pulping system, cement feeding system and tailings metering system have been improved. Therefore, the current flow, concentration, and metering system are stable and accurate, and the filling concentration reaches 65% to 72%, which satisfies the design requirements. However, as the process matures, the filling quality is required to be higher and higher, and the filling process needs to be improved.

1) There are many instruments and instruments in the filling process system. How to ensure the continuous and stable operation of the equipment is a problem in the filling process control;

2) The quality of the filling body is not yet evaluated by a set of testing systems. It is necessary to establish a sound quality assessment and testing system for filling bodies;

3) The vertical sand silo pulping system has yet to be explored and improved to ensure the stability and continuity of the tailings feed.

references

[1] Yang Guangyi. Mining training materials [M] Gansu Education Press, 2007.

[2] Ji Xuewen, Yan Qingwen. Research on cementing filling technology of whole tailings and water quenching slag of Chihong Company[J]Nonferrous Metals(Mineral Part),2006,58(2):11-13

[3] Tian Xiangao, Yao Xiang. Test and application of new materials for cementing in Sanxin Company of Hubei Province [J]. colored. Metal (mining part), 2007.59 (2): 10-13.

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