On-site technical transformation - Fushan Copper Mine Plant

The production and processing plant of Fushan Copper Mine was put into operation in July 1971 to 1978. The average production index only reached: the recovery rate was 89.23%, and the concentrate grade was 15.54%. The production indicators of the past few years have fluctuated greatly.
Fukuyama is a copper solution was warmed account the type of copper-based copper deposits, ore selected to suicide graphite marble type, mainly metallic minerals chalcopyrite and pyrite. Chalcopyrite is mainly in the form of aggregates or fine veins, and is also in the form of small droplets. Pyrite is generally in the form of granules or aggregates that are associated with other sulphides to form fine veins and even small veins. The ore contains about 1.5% of graphite carbon, mainly in the form of fine phosphorus flakes and cryptocrystalline, causing great interference in the flotation. The original ore copper grade is low, fluctuating from 0.42 to 0.74%, and the sulfur content is generally 1.8 to 3.8%, with an average of 2.2%.
1. Process and existing problems before the transformation 71~78 years: The process of flotation adopts one coarse, two sweep, three fine, and medium mine regrind, as shown in Figure 1.

figure 1

In view of the low on-site production index and large fluctuation range, the mine organization technical team, while testing, found the main weak links in production during the production inspection: (1) After the process investigation, the rough sweeping time was not enough. (2) It is not suitable for re-grinding in the middle mine. (3) The grain size is selected. From the small grinding fineness test, the recovery rate increases gradually with the increase of -200 mesh content. When the -200 mesh exceeds 70%, the increase rate of recovery is obvious. gentle. (4) The condition of the flotation reagent is disordered and the place of addition is improper. [next]
2. Main technical measures and indicators (1) Reforming the grinding and floating process to improve the selected grinding fineness At the beginning of the year, the medium-mine re-grinding process was transformed into a two-stage grinding one-time selection, as shown in Figure 2.

figure 2

The ф1200×1800 mill originally used for re-grinding in the middle mine is equipped with a ф350 mm cyclone to form a closed-circuit control. The selected fineness-200 mesh is increased from about 65% to 70-72%, and the copper mineral is fully solved. from. At the same time, the flotation operation conditions are stabilized, and the ball is reasonably matched with a section of the mill, so that the flotation index is greatly improved.
(2) Increase the flotation machine to extend the flotation time and extend the original rough sweeping flotation time from 12.5 minutes to more than 18 minutes: Select (4A) from 3 to 4 times, the recovery rate and the uniform ratio of concentrate grade Before the increase of 2.11% and 3.72%.
(3) Reforming agent addition method Stabilizing agent dosage The addition of oil medicine was changed from manual to self-made electronic numerical control machine, which stabilized the dosage and accuracy of the medicine, eliminated the loss, saved the dosage of the medicine (see the table below), and improved the sanitary condition.

After the process reform, the production practice in the past two years proves that it is technically feasible and economically reasonable; and obtains satisfactory production indicators (see table below). However, it is still necessary to study and further improve the grade of concentrate.

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