Example of iron recovery in molybdenum tailings (Jinducheng Molybdenum Company)

JINDUICHENG companies with ore processing 21 000 t, using a floating priority molybdenum, sulfur and then float, after losing tail, molybdenum concentrate rough concentrate regrinding, multiple selection, the election of molybdenum copper tailings re-election after losing The tail tail principle process, a total of molybdenum concentrate, sulfur concentrate, copper concentrate three products, of which molybdenum sulfur tailings accounted for 95% of the total ore, pulp concentration of 28% to 32%, -0.074mm content of 50% to 60 %. Iron grade containing 5.7% ~ 8.3%, Mfe average of 0.8%, a sulfur content of 0.4% to 0.6%, iron minerals phase analysis are shown in Table 1, the results of particle size analysis are shown in Table 2.

Table 1 Analysis results of iron mineral phase (%)

Table 2 Results of particle size analysis of ore concentrate

Comprehensive recovery of magnetite, Jinduicheng Molybdenum Company and Anshan Iron and Steel Institute of Mining pieces together, using magnetic separation - re-grinding - fine screen beneficiation process, the successful recovery of molybdenum sulfur magnetite tailings, the production process see picture 1. The technical measures taken are:

Figure 1 Iron concentrate production process

1. Using the gap of the production plant site, a magnetic separator is placed between the sulfur flotation machine and the tailings chute, and the molybdenum-sulfur tailings are self-flowed into the magnetic separator by the height difference, and the magnetic separation tailings are self-flowing. The tailings chute, and the magnetic separation coarse concentrate with a yield of less than 2% is pumped to another plant for re-grinding and re-election, which can save the transportation cost of the magnetic separation ore tailings flow of about 3000m ³ /h.

Second, borrowing the idle φ2.1m×4.5m ball mill and workshop as the regrind and re-selection plant of magnetite, can save 700,000 yuan investment, shorten the period of 6 months, and the total investment of the project only costs 2.3 million yuan.

Third, in order to reduce the intermediate product sand pump lift, the fine screen is changed to the last step of the sorting, installed in a higher position, to achieve the self-flow of the screen and the bottom of the screen to ensure the final concentrate grade.

From October 1993 to the end of 1994, the cumulative production of iron concentrate was 15,000 tons, the average grade of iron concentrate was 63.70%, and the total recovery rate of iron was 50% to 55%. The other impurities did not meet the national standards. . If the molybdenum sulfur tailings are all recovered, the annual output of iron concentrates is 40,000 tons, and the profit is about 2 million yuan.