The so-called easy to choose the type of iron ore, iron ore concentrate grade TFe should reach 60%, mineral processing recovery rate of 90%. In production practice, only a few iron deposits have reached and approached such beneficiation indicators, such as the Fushan Iron Mine in Shexian County, Hebei Province. The deposit is contact-type iron ore (邯邢å¼), the mineral composition of the deposit is simple, mainly magnetite, hematite, pyrite, and the ore structure is self-crystal, hemimorphic, semi-automorphic Mainly, the ore structure is dominated by dense blocks, strips, and disseminated, which are favorable conditions for mineral processing. The average grade of ore TFe is 43.33%, and the blast furnace rich ore accounts for 80%. Among them, No. 2 ore body wet magnetic separation, selected ore grade TFe39.0%, concentrate grade TFe 64.0%, tailings grade TFe 8.0%, recovery rate TFe90.0%; No. 7 ore body dry magnetic separation, The ore grade was 43.0%, the concentrate grade TFe was 64. 0%, the tailing grade was TFe 8. 0%, and the recovery rate TFe was 90.0%. Both ore bodies are of the type of easy ore.
B Easier selection of ore (or deposit) type examples
The type of iron ore or deposit that is easier to select is the majority of China's iron ore resources. The types of deposits mainly include sedimentary metamorphism, contact metasomatism (skarn) and iron deposits associated with volcanic-invasive activities. Among them, the proven iron ore reserves, large scale, and concentrated distribution are sedimentary metamorphic iron ore deposits. The proven iron ore reserves account for 57.7% of the total iron ore reserves in the country, with “large, poor, shallow, Easy (selected) and other characteristics, that is, the scale of the deposit is large, the iron content is low, and most of the ore bodies are exposed on the surface or shallow, easy to pick and choose. The iron ore is selected from TFe20% to 30%, the iron concentrate grade is more than 60%, and the recovery rate TFe is over 80%. It is a relatively easy deposit type, mainly distributed in the Anshan (Shan) Ben (Xi) area, East area, Wutaiyi Luliang area. The main indicators of its ore dressing are as follows:
(1) The long-exploited Angang Dagushan super-large iron ore mine in Anshan, the ore grade is TFe32.25%, the magnetite concentrate TFe grade is 66.27%, the tailings grade TFe9. 06%, the recovery rate TFe83 . 25%. Benxi Nanfen super large iron ore, ore selection grade TFe29.6%, concentrate grade TFe67.55%, tailings grade TFe8.42%, ore recovery rate of 80. 55%.
(2) The Dashihe large iron ore mine in Qiandong area was selected to have an ore grade of TFe24.77%, a concentrate grade of TFe 68.16%, a tailing grade of TFe6. 64%, and a beneficiation recovery rate of 81.85%. Selective test of magnetite ore in the northern area of ​​Sijiaying super-large iron ore mine in Qi County, magnetic separation into ore grade TFe26. 25%, concentrate grade TFe64.60%, tailing grade TFe 6.45%, ore recovery rate 83.80 %; Southern region hematite ore with weak magnetic-strong magnetic-flotation method, selected ore grade TFe31.23%, concentrate grade TFe65. 01%, tailings grade TFe9.69%, ore recovery rate TFe81.51% .
Among the more easily selected ore (or deposit) industrial types are the contact metasomatism (skarn) type and the type of iron deposit associated with volcanic-invasive activities. Among them, the contact deposit type (skarn) representative deposit is the East Daye Iron Mine (Tieshan Iron Mine), which is an important iron ore production base of WISCO. It has a long history of mining and was selected in the 1990s. For the mixed mines in the eastern open mining area and the underground mining area, the ore grade is TFe39.87%, the iron concentrate grade is 57.38%, the tailings grade is 19.3%, and the ore dressing recovery rate is 72.61%. The representative deposits of iron ore related to the volcanic-invasive activity are the Meishan and Jishan deposits in the Ning (Nanjing) Yitun (Lake) area. The main indicators of the ore dressing are: Meishan iron ore is a large iron-rich deposit, and the ore grade TFe45.04%, concentrate grade TFe63.54%, ore recovery rate of 83.46%. Jishan Iron Mine is a large-scale disseminated lean magnetite deposit. The original ore grade is Tef26.4%, the concentrate grade TFe59.4%, and the ore dressing recovery rate is 67.41%, which is close to the easier ore (or deposit) type.
C refractory ore (or deposit) type example
The Ningxiang-type sedimentary iron deposit is one of the types of refractory ore (or deposit). According to exploration and ore geological research, the genetic type of such iron deposits is sedimentary iron ore. The Ningxiang-type iron ore is a marine sedimentary iron ore, represented by a sag-like hematite deposit in the Upper Devonian marine strata in the Ningxiang area of ​​Hunan. This type of iron ore is widely distributed in the E, Hunan, Jiangxi, Sichuan, Yunnan, Guizhou, Guizhou, and Gannan regions of South China. It is the most widely distributed marine deposit type iron ore in China. The proven reserves of iron ore amounted to more than 3.7 billion tons (including off-balance sheet reserves), accounting for about 9% of the proven iron ore reserves in the country, accounting for 74% of the proven reserves of sedimentary iron ore in the country. The ore optional experiment, the ore dressing experiment made in the 1960s and 1970s proved difficult to select, failed to achieve the purpose of iron-rich phosphorus reduction, and could not be attacked for a long time. For example, in the four large-scale Ningxiang-type iron ore mines in western Hubei, the phosphorus-containing iron ore industrial index limits the maximum allowable content of harmful components several times, and the problem of separation of iron and phosphorus has not been effectively solved so far.
From the geological perspective of the main factors the South Ningxiang type iron caused by refractory, observation and analysis with electron probe test by the former Guilin Metallurgy Institute of Geology (the predecessor of Guilin Institute of Geology and Mineral Resources) in 1972 with a powerful microscope, It reveals that the ore structure, such as heavy, granular, massive, gravel and other ore structures, are colloidal and are commonly found in the structure of the ore-like ore. The colloidal substance is tested by electron probe. Mainly iron, phosphorus or iron, phosphorus, silica gel, its element state: iron is micro-hematite, siderite, limonite, phosphorus is mainly micro-phosphorus phosphate, silicon is quartz aggregate . The colloidal iron, phosphorus or a combination of particulate minerals such as iron, phosphorus and silicon is difficult to separate, which is the main reason for the failure of such ore to reach iron-rich and phosphorus-reducing processes in the beneficiation process. For example, the large-scale hematite deposit in the official site of the Western Hubei, the ore is selected from TFe48.09%, phosphorus 1.06%, concentrate grade TFe52.81%, phosphorus 0.17%, recovery rate 84.14%, tailings grade TFe32. 6 %, phosphorus 3.95%. It can be seen that the refined ore grade is only 5 percentage points higher than the grade of the selected ore, and the phosphorus is also high, which is difficult to select high-phosphorus hematite ore. The Qiuyue Iron Mine in Luzhai County, northeastern Guangxi, is also a marine sedimentary hematite deposit. The average grade of ore is 44.05%, the average grade of phosphorus is 0.78%, the average grade of sulfur is 0.12%, and the average grade of Si02 is 21.65%. By roasting plant tests, selected ore grade TFe43.6%, concentrate grade TFe49%, 85% recovery, are also refractory high phosphorus hematite.
China's marine sedimentary hematite deposits are distributed in the south and north. Mainly concentrated in the northern Hebei Xuanhua and long off area, it said Xuanlong deposition type iron ore. Southern and Northern Ningxiang type iron ore has Xuanlong formula ores steel structural configuration, but different nuclear components oolite oolitic ore: Southern oolite Ningxiang type iron core component mainly iron, iron or phosphorus, phosphorus , silicone substance, refractory ore is a high phosphorous (bed) type; North Fangxuan Long formula hematite ore deposit to form a granular structure he main core oolite more preferred crystalline siderite, the cement he shaped iron nibs easily separated from the iron minerals, ores belonging easier (bed) type.
Linear Actuator Controller,Linear Actuator Control System,Linear Actuator Control Kit,Electric Actuator Controller
ZHEJIANG XINYI INTELLIGENT DRIVING TECHNOLOGY CO.,LTD , https://www.xinyiactuators.com