Manuscript report of ore drawing powder pool in mineral processi

1. Iron ore beneficiation technology and process
China's iron ore is rich in lean ore (accounting for 97.5% of the total reserves) and comprehensive ore with other components (accounting for 1 / 3 of the total reserves), so most of the iron ore needs to be beneficiated before smelting.
in 1996, 214.97 million tons of iron ore were selected, accounting for 85.2% of 252.28 million tons of iron ore in China, Among them, the key concentrators process 109.61 million tons of raw ore and proce 41.58 million tons of iron concentrate powder, accounting for 48.4% of China's iron concentrate powder proction.
(1) ore crushing
China's concentrators generally use three-stage crushing process of coarse crushing, medium crushing and fine crushing to crush iron ore. generally, 1.2m or 1.5m rotary crusher is used for coarse crushing, and 2.1m or 2.2m standard cone crusher is used for medium crushing, 2.1m or 2.2m short head cone crusher is used for fine crushing. The coarse broken ore is not more than 1m in size, and then it is divided into medium and fine crushing. The final proct with ore particle size less than 12mm is sent to grinding tank, In recent years, some concentrators have changed from two-stage grinding to three-stage grinding e to the new process of fine screening and regrinding. Generally, the grinding equipment used is relatively small, and the maximum ball mill is 3.6m × 6m, maximum rod mill 3.2m × 4.5m, maximum autogenous mill 5.5m × 1.8m, gravel mill 2.7m × 3.6m.
spiral classifier is basically used for classification after grinding. In order to improve efficiency, hydrocyclone is used to replace secondary spiral classifier in some concentrators.
(3) separation technology
1. Magnetite beneficiation
e to strong magnetism and good grinding and separation, domestic magnetic concentrators all adopt stage grinding and multi-stage grinding processes, The former (one-stage grinding) is used for coarse-grained magnetite and the latter (two-stage or three-stage grinding) is used for fine-grained and fine-grained magnetite. A series of permanent magnetic separators developed by our country have realized permanent magnetization. Since 1970s, the concentrate grade has been increased from 62% to 66% e to the new technology of fine screening and regrinding popularized in national magnetite concentrators, The requirement of 65% concentrate grade proposed by Ministry of metallurgical instry has been realized.
2. Weak magnetic iron ore beneficiation is mainly used to separate hematite, limonite, Specularite, siderite, pseudo hematite or mixed ore, which is called "red ore". This kind of ore has low grade, fine disseminated particle size, complex mineral composition and difficult separation The research on technological process, equipment and new kinds of reagents such as wet high intensity magnetic separation, weak magnetic flotation and gravity separation has been continuously improved, which has resulted in the continuous improvement of concentrate grade and metal recovery.
3. Beneficiation of polymetallic syngenetic ore
this kind of ore has complex composition and diverse types, so the methods, equipment and processes used are also different, such as reverse flotation multi gradient magnetic separation In order to improve the recovery rate of iron and comprehensively recover rare earth oxides, there are different technological processes, such as flocculation flotation, low intensity magnetic reverse flotation high intensity magnetic separation, low intensity magnetic positive flotation and roasting magnetic separation. Panhua Iron Mine obtains about 53% TFE ferrovanadium concentrate by magnetic separation, and the tailings after magnetic separation obtain titanium concentrate and sulfur cobalt concentrate by low intensity magnetic sweeping high intensity magnetic separation gravity separation flotation dry electric separation, Recovery of titanium and cobalt. Iron, copper, cobalt, sulfur and other elements are comprehensively recovered from Daye iron ore by weak magnetic high magnetic and flotation

2. Decoration water and electricity construction drawings
(1) determine the location of points
in the first step of making decoration water and electricity construction drawings, we need to determine the location of some points. How to determine the location of points? According to the design drawings of home wiring, and then combined with some point schematic drawings on the wall, it is best to use eye-catching signs to mark the cassette of each point. The next step is to determine the height of the cassette. Generally, the height of the cassette needs to be consistent with the position of the electric socket. If multiple cassette are together, the distance between them should be kept at least 10 mm. The position of each water outlet should be determined and marked together
(2) slotting
slotting here refers to the trunking for wiring and the water trough for pipe laying. It should be noted that the width of the trunking and the water trough can be determined according to the same materials used. Slotting should try to ensure the following principles: first, follow the principle of the shortest route; Secondly, the principle of not destroying the original strong current should be followed; Third, follow the principle of not destroying waterproof. The slotting should be horizontal and vertical with uniform size. Generally, the depth and width of the slotting should be at least 4mm wider than the material used
(3) wiring and water pipes
when wiring and piping, we must pay attention to ensure that the lines and pipes are unblocked, use as few elbows as possible, and test after wiring, for example, the network cable and telephone line must be well tested when wiring. If we find that they are blocked later, we have to remove them and do it again, which will cause great losses. The same is true for water pipes. When wiring, a long line should be left at the outlet of the point. If it is long, it can be cut off. If it is long, it is not feasible to connect it for a long time.