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Example of the Ternente Copper-Molybdenum Ore Selection Plant of Brenden Copper Company
1 Introduction
Tennite was mined in 1905 by Breden Copper Company of the United States. In 1970, it became a joint venture between the United States and Chile. In 1971, it was owned by Chile and is now part of the Chilean national copper company Codeleco.
Oyster Pond gold mine in central Chile, Sri Lanka (Ohiggine) province, altitude 2600 ~ 3000m, is one of Chile's largest copper mine, Chuquicamata deposit, second only to the existing ore reserves 5000Mt, copper metal content of 50Mt. The existing production scale is 57.4kt/d, with an annual output of 250kt of refined copper and 1700t of molybdenum . In 1976, it produced 2322 tons of molybdenum.
2. Deposits, ores and mining
The ore body is produced in the Andesite , with the invasion of quartz diorite , and the large-scale copper deposit of the Anshanite where potassium, biotitization and quartz sericite are altered. In addition to the primary mineralization, the upper leaching zone, oxidation zone, metal minerals are mainly malachite water cholesteric, containing 1% copper, accounting for 20% of the total reserves; the central part is the secondary enrichment zone, containing 1% of copper~ More than 2% is the main mining target. In the mine, the metal minerals are chalcopyrite (70%), chalcopyrite (20%), and porphyrite (5%). A lower band on native, main mineral chalcopyrite, pyrite. The average copper content is 0.8%. The ore body is controlled at 2400m in length, 600m in width and 800m in depth. With 0.5% Cu as the cut-off grade, the proven ore reserves are 5000Mt, with an average of 1% copper and 0.036% molybdenum.
3. Mineral processing technology
Teninte has two plants: Seville, with a production capacity of 31 kt/d, which produces only Cu-Mo-S mixed concentrate; Coron (which was put into operation in 1970) has a production capacity of 26 kt/d and handles Seville mixed concentrate. sorting. The process flow of the Coron plant is shown in the figure below.
Tucolon mineral processing process
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Broken: three sections and one closed circuit, coarse and medium crushing are provided with pre-selected screening, product size -13mm.
Mixed flotation: There are seven mill-floating series. The selection is carried out in a weakly acidic medium (pH 4.2) which increases the recovery of copper. Grinding ¢ 4270 × 7320mm ball mill and 5 ¢ 510mm cyclone closed circuit, overflow fineness 60% -200 mesh.
Separation of copper-molybdenum and pyrite: The mixed concentrate is concentrated and adjusted to float copper-molybdenum in an alkaline medium to inhibit pyrite. In this separation, the slurry is adjusted to pH=12 with lime and then subjected to a rough selection and one sweep.
Copper-molybdenum separation: After the first stage of separation of the concentrate, here LR-744 ( phosphorus -Knox) ​​copper is used to capture molybdenum ore with fuel oil. This separation uses three concentration, two-stage re-grinding, and thirteen-time selection. The obtained molybdenum concentrate is then leached with higher copper impurities by sodium cyanide to obtain qualified concentrate. The separated rough-selected tailings are copper. Concentrate.
Molybdenum-sulfur separation: The first stage of tailings also contains a part of molybdenum ore, which is further enriched in the latter part of the copper-molybdenum separation by trapping it with fuel oil.
Obviously, the mixed concentrate is separated into three sections to obtain qualified copper concentrate and molybdenum concentrate.
4, flotation reagent
The drug consumption (g/t) calculated by the original ore.
Migne Lek (Minerec) - 54-carboxylate xanthate, Powell (Powll) 40, 1362 sulfate, lime 340, aerofloat 4.5, LR-744 122.6, 31.8 coal oil.
5, mineral processing indicators
Raw ore grade: 1.56 % Cu, 0.023 % Mo; molybdenum-sulfur mixed concentrate: 26.82% Cu, 0.339% Mo; copper concentrate grade: 39.86% Cu, 0.05% Mo; copper recovery: all copper 84%, copper sulfide 90%; molybdenum concentrate grade: 55.15% Mo, 0.46% Cu; molybdenum recovery rate 59%; tailings grade: 0.276% Cu, 0.008% Mo.