Copper other (product processing, management, sewage purification, etc.) (2)

Figure 6

(three)
SHOUWANGFEN beneficiation plant is put into operation in 1957, the old plant. Now ore processing capacity of 3,000 tons / day, using the first floating magnetic processes, mainly the production of copper iron two products. Over the years, the electricity consumption per ton of ore is 26.9~36 degrees, and its total electricity consumption accounts for 55~58% of the total mine. Its electricity cost accounts for 46~49% of the ore processing cost. Obviously, in order to reduce the cost of mineral processing, it is undoubtedly the first to seize the bulk of the power consumption of mineral processing.
The main reason for the high power consumption of mineral processing is that the main equipment used is mostly the old products of the 1950s. The grade of raw ore dropped sharply from 0.81% to 0.156%, and the ratio of mineral processing increased sharply from 13 to 174. As the depth of mining increases, the size of the inlay of useful minerals becomes finer, and the efficiency of grinding is reduced from 26 tons/hour to 21 tons/hour; the annual ore discharge decreases year by year, the amount of sunrise is uneven; the wet season forms wet ore. , forced to use large mesh or open mine.
In order to reduce power consumption, in recent years, the plant has been upgraded from equipment, making full use of high-difference, promoting power-saving technology, reasonably opening and stopping ball mills , and strengthening power management to achieve certain results.
1. Equipment replacement (1) Iron filter In May 1974, 7 sets of 20 square meters cylindrical vacuum filter were replaced by 3 12 square meters permanent magnet cylinder vacuum machine, and all belt conveyors were omitted. And a magnetic dewatering tank simplifies the process. When the production capacity of the filter is 2 tons/m ² when it is 0.45 ton / m ² , the annual energy saving is 110,000 kWh.
(2) Vacuum pump In the first quarter of 1984, four SZ-4 water ring vacuum pumps and one SZ-3 pressure fan were replaced by four Ñ„600 mm water jet pumps, which were used on copper and iron concentrate filters to reach one. Dual use of the machine. The measured power of a single unit was reduced from 55 kW to 22.4 kW, and the annual power saving was 900,000 kWh.
(3) Flotation machine In 1976 and 1977, 24 sets of 14-cubic-meter double-slot pneumatic mechanical agitation flotation machine were used to form two series for roughing and sweeping, replacing 7 series of 196 sets of 5A. And 6A flotation machine, saving 15.37%.
2. Make full use of the height difference and minimize the sand pump
(1) The magnetic separator is moved down to reasonably distribute the slope of the pipeline, so that the coarse and fine selection machines are all moved to the lower layer of the original position. The slurry of the magnetic separation operation realizes complete self-flow, and 7 sets of 6 hour sand pumps and 2 are eliminated. The 4th hour sand pump saves 1.58 million kWh per year.
(2) Using the elevation after the tailings dam is piled up, cancel the return water of the tailings dam of the tail of the pump. The original water pump with the installed capacity of 180 kW and 225 kW is used. Raise to the old cattle pumping station with an elevation of 447 meters, and then send it to the high pool. In 1977, when the tailings dam was expanded, the height difference between 490.8 meters and 447 meters was fully utilized. A new well was built, and a 1280-meter roadway was drilled to lay a 650-meter pipeline, so that the tailings water flowed to the Lao Niuhe pump house (see Figure 7), and the return pump was cancelled, saving 1.05 million kWh per year. [next]

Figure 7

3. Strengthen the dispatching command, reasonably start and stop the ball mill, and use the best operation mode. The best operation of the ball mill is 8 sets, followed by 7 sets, 6 sets and 3 sets. Therefore, strict scheduling is required, and the changes in the amount of ore produced in the mine are mastered. The storage volume of the fine ore bins is utilized, and 8 and 7 billiard mills are opened, and 4 and 5 sets are not opened, so as to achieve the purpose of power saving.
4. Promote power-saving technology (1) Use silicon rectification and thyristor speed control to select heavy-duty iron plate for the mining machine with 18.5 直流 DC motor, the power supply is a 75 瓩 DC generator set (also for - change The DC power supply of the high-pressure oil switch closing mechanism of the electric station needs to be driven continuously). The iron plate drives the mining machine to be discontinuous, and a large amount of electricity is wasted every year. Now use silicon rectification and thyristor speed control device, placed next to the feeder, and start and stop with the start and stop of the feeder. It has been determined that the annual power saving is 300,000 degrees, and the key problem of automatic speed regulation of iron plate feeding is also solved.
(2) Promotion of AC contactor silent operation device AC contactor widely used in industry has many drawbacks, such as high power consumption, high noise, strong iron core heating, easy coil burning, and a large amount of reactive current required by the grid. To reduce the network power factor. Recently, the factory has promoted a total of 62 silent operation devices of three types of AC contactors. The above shortcomings have been overcome, with less investment and significant economic effects. After measurement, the effective power saved is above 91%, and the total electricity saving is 20,000 degrees.
(3) Install capacitors for reactive power compensation and improve power factor. A total of 1,450 thousand high and low voltage capacitors were installed in the mine. Among them, 1000 million of ore dressing plants were used, which increased the power factor of the whole mine from 0.86 in 1982 to 0.907 in the first quarter of this year. In the first quarter, it saved 170,000 kWh.
5. Strengthen electricity management
(1) Grasping the measurement work at the grassroots level, issuing power consumption indicators to the workshops, installing meter measurements, and incorporating the economic responsibility system, effectively promoting the development of power-saving work.
(2) Conduct a general survey on the power consumption of each process to find out the power-saving ways and measures. Since May 2004, the plant has adopted the above-mentioned power-saving measures. In 75 and 76 years, it has achieved obvious power-saving effects. After 77 years, due to the increase in the number of sand pump sections for the tailings, the secondary magnetic selection by the sand pump was added, and the fine-grained re-grinding process with a single cycle over a period of time was used, especially in 82 years. In the month, the effectiveness of the ball mill and the severe wetness formed during the rainy season were reduced, which caused the power consumption to increase significantly year by year. However, these power-saving measures have effectively slowed down the growth rate of power consumption. Since the second quarter of this year, there has been a good situation of a drop in unit consumption. The table below gives a comparison of the power consumption in two periods that are comparable and illustrates the combined effect of the above measures.

Note: In the third quarter of 82, 83, there were severe temperature mines formed during the rainy season.

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