Dry goods! Manganese Oxide Ore Dressing Plant Practice

Manganese ore reserves around the world in about half of oxidation of manganese ore. According to statistics, the annual capacity of processing manganese oxide ore in foreign countries accounts for about 70% of the total manganese ore in the year.

China's manganese oxide deposits are classified by leaching, accumulation and manganese cap type according to their genesis. Manganese oxide, manganese ores were mainly hard manganese ore, manganese ore and water, manganese ore, gangue minerals mainly silicates, but also carbonate minerals, frequently with iron, phosphorus, and nickel, cobalt and other ingredients. Manganese oxide ore is not only low in grade, mixed in composition, and contains a large amount of mud, especially in leaching type and accumulation type. The mud content is as high as 70% or more, and the density and specific magnetic susceptibility of manganese minerals and gangue minerals are different. , washing, re-election, high intensity magnetic separation is the primary method of treating the oxidation of manganese ore, usually washing or washing process to obtain a high intensity magnetic separation metallurgy with manganese, while the use of a washing reselection or reselection a strong magnetic separation The principle process generally provides manganese for batteries and chemicals. For the sedimentary primary manganese oxide ore, heavy medium and jigging are used to remove the gangue to obtain a massive concentrate.

Among the iron-containing manganese oxide ores, the iron mineral is mainly limonite. Iron and manganese are difficult to separate by re-election, flotation or strong magnetic separation, and a reduction roasting magnetic separation method is required. The industry has adopted a washing-reduction roasting magnetic separation-reselection process to separate iron and manganese.

1 Beneficiation overview

Fujian Metallurgical (Holdings) Co., Ltd. Liancheng Manganese Mine is located in Miaoqian Town, 54km southwest of Liancheng County, Fujian Province, including two manganese mines in front of Miaoqian and Lanqiao. The distance between them is 12km, which belongs to the area of ​​Miaoqian Town. The mining area is 72km from Longyan Railway Station and 160km from Yongan Huinian Station.

By the end of 2000, the accumulated manganese ore geological reserves were 2.792 million tons, and the retained reserves were 989,000 tons. The main components (average): Mn28%, Fe 2.54%, P 0.035%, Si02 24.36%. The ore is a low phosphorus, low sulfur, low iron, high silicon manganese ore.

Liancheng Manganese Mine is a medium-sized state-owned open-pit mine enterprise with geological exploration, mining, mineral processing , mineral processing, machinery manufacturing, repair and other professional support. It is also the main production base of metallurgical manganese-rich ore and discharge manganese ore in Fujian Province. It has three production units, one mining area, two mining areas and manganese powder workshop, and three economic entities. The annual mining capacity of manganese ore is 60,000 tons, and the production capacity of manganese powder is 20,000 tons. The main products are metallurgical manganese ore, manganese carbonate ore, natural discharge manganese powder, water purification manganese ore, battery and active manganese dioxide powder for casting, manganese trioxide and manganese sulfate, manganese powder for chemical industry, manganese carbonate ore and Mineral powder.

2 ore properties

The natural type of Liancheng manganese ore is mainly manganese oxide ore, which has two types: primary and oxidized. Manganese minerals pyrolusite mainly, hollandite, cryptomelane, Ensu Ta-based ore, manganese and a small amount of soil, hausmannite, manganosite, manganese, magnesium, barium, manganese and zinc, galena and manganese limonite. Gangue minerals quartz based, time for kaolin, sericite, opal, pulp stone, clay and the like.

Liancheng manganese ore primary manganese ore is only found in sedimentary-reformed deposits, mainly composed of manganese carbonates, sulfides and silicates. The ore type is mainly composed of mixed primary manganese ore, and can be divided into sulphur manganese ore-manganese carbonate ore, sulphur manganese ore-manganese silicate-manganese carbonate ore. In rhodochrosite manganese ore, manganese ore sulfur, mainly rhodonite, a small amount of sulfur, iron ore, calcium rhodonite spessartine; associated metallic minerals galena, sphalerite, tellurium silver ore, blue Hui copper ore and pyrite. The gangue minerals are mainly quartz, calcite and chlorite, a small amount of diopside , serpentine and clay stone. The main chemical composition analysis results of ore are shown in Table 1.

Table 1 Analysis results of main chemical components of ore

3 Production process and process

Liancheng Manganese Mine has two refineries and a magnetic separation joint process in front of the temple and Lanqiao. The pre-miao concentrating plant mainly deals with the slope-type manganese ore in the pre-miao mining area and the semi-finished ore containing about 30% manganese in the Lanqiao mining area, and produces 46% manganese-containing magnetic separation concentrate for the manganese powder raw material. The Lanqiao Concentrator mainly deals with low grade (less than 17% manganese) semi-finished ore, and selects jigging concentrate containing about 47% manganese and magnetic separation concentrate containing about 43% manganese as manganese powder raw material, manganese grade of tailings. Directly discharged into the tailings pond at around 6%.

The process flow of the Liancheng Manganese Mine Pre-Mineral Concentrator is shown in Figure 1. The raw ore is sent to the grid sieve, the product is sieved into the washing machine, the mine is sorted by double-layer vibrating screen, the hand is selected from +30mm grain size product, and the clods and stones are selected for returning and washing; -30mm +3mm grain size The product enters the jigging selection, the jigging concentrate selection, the selection of waste rock, the hand-selected concentrate and the +30mm grade hand-selected concentrate are combined as the discharge manganese concentrate; the jigging tailings and the -3mm size The product is merged into the grinding and grading operation consisting of rod mill, vibrating screen and spiral classifier. The spiral classifier overflows - 1mm product enters the Shp-1000 strong magnetic separator unit, selects the manganese concentrate for the battery, and the strong magnetic The tailings are cleaned by DPMS wet permanent magnetic strong magnetic separator, and the selected concentrate is used as raw material of manganese powder. After sweeping, the tailings are directly discharged to the tailings pond. The main equipment of the concentrator is shown in Table 2.

Figure 1 Process flow chart of Liancheng Manganese Mine Pre-mineral Concentrator

Table 2 Main equipment of the former concentrator of the temple shop

The process flow of Liancheng Manganese Mine Lanqiao Concentrator is shown in Figure 2. The raw material enters the original mine silo, is washed by high-pressure water, and is crushed by +75mm grain size; -75mm granular grade enters the trough type washing machine, and the cleaned ore is transported by belt to double-layer vibrating screen for screening, -75mm+25mm grain size The hand is selected to obtain about 48% of the concentrate, and the waste rock is directly thrown away; the -25mm+5mm size enters the coarse jig to select the concentrate with about 48% of the manganese grade; the jigging tailings enters the intermediate bin. After natural drying, it enters the dry magnetic separation and sorts to obtain a concentrate with a grade of about 20%. The tailings are hand-selected to obtain a manganese grade of about 38%, and the tailings contain about 2% of manganese directly tailing; The overflow flows through three spirals to recover the fine-grained grade minerals. After entering the intermediate ore bin with the -5mm and the jigging medium ore, it is subjected to a coarse and one-sweep sorting by the wet magnetic field magnetic separator to obtain the manganese grades of 38% and About 34% of the concentrate, wet-sweeping tailings and spiral classifier overflow merged into fine-grained jigging, to obtain fine-grained jigging concentrate, jigging tailings directly tailing. The main equipment of the concentrator is shown in Table 3. Table 4 of the main production technical indicators.

Figure 2 Process flow chart of Liancheng Manganese Mine Lanqiao Concentrator

Table 3 Main equipment of Lanqiao Concentrator

Table 4 Main technical indicators of Lanqiao Concentrator in 2008