Aotanmaji (Otanmaki) mineral processing plant located in central Finland, put into operation in 1954, processing vanadium-titanium magnetic iron ore deposits Aotanmaji. Since 1968, the plant has been integrated into Finland's largest potential Tarukaki steel company. For many years, Otto Maki has been Finland's largest titanium mine, and the reserves of vanadium-titanium magnetite determined at the end of 1972 are close to 20 million tons. The entire mine includes underground mining (with a broken cavern); a crushing plant with dry magnetic separation; a dressing workshop and a vanadium workshop with sintering equipment.
The concentrator uses a magnetic separation-flotation combined process for production. In 1972, it processed 1.05 million tons of ore, produced 257,000 tons of magnetite concentrate, 149,500 tons of ilmenite concentrate, 0.5 million tons of pyrite concentrate and 2,124 tons of vanadium pentoxide. Among them, vanadium products are supplied to Sweden, the United Kingdom, the Federal Republic of Germany, the Soviet Union and other European countries.
The excavation bodies of Ottomanki are found in some lenticular ore bodies, which are 20 to 200 meters in length and 30 to 50 meters in width. The ore processed by the ore dressing contains 38-40% of magnetite, 27-30% of ilmenite, 1-2% of pyrite, and the other are silicate gangue (mainly chlorite, hornblende and plagioclase ). ). The quartz in the dissociated state of the monomer does not actually exist, so the ore is more difficult to grind. The ore composition is not uniform, and the main elements in the ore are: TFe 40%; TiO 2 13%; V0.25%; S1%; P0.01%.
After the plant was put into production, the beneficiation process has undergone two major reforms. Before 1958, coarse-grained dry magnetic separation was used, and after coarse refinery re-grinding, wet magnetic separation was used to select magnetite concentrate. The magnetic separation tailings first floated out the sulfur concentrate, and then floated titanium after de-sludge removal. iron ore. Flotation ilmenite was carried out with Tal oil at pH 6.5. The flotation concentrate grade was TiO 2 44% and the recovery was 74%. After 1958, the process of selective flocculation flotation of ilmenite was changed, which was characterized by the fact that the sulfur flotation tailings were directly treated with high concentration (40-70%) and pH 6.2-6.6 for a long time ( 40 to 60 minutes), the collector used is a mixture of Tal oil and diesel oil (tar oil: diesel = 1:2) and Einxolp-19, which is 3 to 5% of the mixture, is added as an emulsifier. pH = 3.2 to 3.6. After achieving this operation, the grade of titanium concentrate was obtained as 44% of TiO 2 with a recovery rate of 88%, which was 14% higher than that of desilted flotation.
After many years of production practice, many reforms have been carried out. The reform process is shown in Figure 1. The ore is crushed in three stages, and the final crushed ore size is 25 to 0 mm. After the second stage of the crushing, about 15% of the discarded tail scorpion is preselected from the material having a particle size of 75 to 10 mm by dry magnetic separation. After the third stage of crushed ore, the final sieve is sieved by a 3 mm sieve. The sieved product was then magnetically divided into 8% of abandoned tailings by Section II. The undersize product is fed into a hydrocyclone with a diameter of 250 mm, and the underflow is combined with the magnetic product selected in the second stage of the magnetic separation to be fed into the rod mill for grinding. The rod mill discharges and the cyclone overflow merges into the sputum classifier, which returns to the sand and then grinds with a ball mill. The ball mill discharges and the classifier closes. The classifier overflow particle size is 60% to 0.074 mm.
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