Low grade iron ore beneficiation technology
Water glass and sodium hydroxide are used as dispersing agents for the slime and the pH of the slurry is adjusted to 10-11. The corn starch is added, and the stirred pulp enters the thickener for selective flocculation and desliming. In the thickener, the quartz slurry is discharged by overflow, and the sand of the thickener is flocculated concentrate. When the thickener is supplied with iron containing 35% to 38%, the discharged overflow contains 12% to 14% of iron, the grit contains 44% of iron, and the concentration is 45% to 60%. The grit is then passed through the slurry distributor. The tank was stirred, then corn starch was added as an inhibitor, and the amine floc was used for reverse flotation of gangue minerals. The final concentrate contains 65% iron, contains 5% quartz, and the iron recovery rate is about 70%. The plant uses selective flocculation and reverse flotation to treat fine-grained hematite. The main features are: 1) Fine grinding: using the two-stage closed grinding process of “self-grinding-fine crushing-gravel grindingâ€, choose large wet self-grinding machine (φ8.2m×4.4m) and large gravel mill (φ4.7m×9.1m) Support purchase. Balancing the two-stage load by 1:2, coupled with the application of the cyclone grading, enables the industrial production to meet the requirements of fine grinding (80% less than 0.025 mm), creating conditions for selective flocculation flotation. 2) Flocculation and desliming: The dispersant is added to the mill, which saves auxiliary equipment and strengthens the dispersion operation but does not affect the grinding classification. 3) Reverse flotation: using amine as a collector, after high-concentration slurry adjustment, only concentrate once to obtain concentrate. The iron minerals in the foam are reduced by increasing the number of sweeps. 4) Backwater utilization: Industrially successful application of flocculant and lime to treat backwater separately. Simple and easy. The water reuse rate is up to 95%, reducing drug consumption and cost, and reducing environmental pollution. 5) Concentrate dehydration: Because the fine grain size is not easy to dehydrate, a three-stage dehydration process is adopted. Flocculation is to first cause the fine iron mineral to form a flocculation group to sink, and then remove the partially dispersed suspended gangue slime by concentration. This process can be carried out several times. Iron concentrates are obtained, but such coarse concentrates often fail to meet quality requirements, and further reverse flotation is required to improve the grade of iron concentrates. In the reverse flotation, the inhibitor of iron mineral is first added to the slurry, and then the reverse flotation is carried out with a cationic collector or an anionic collector. When reverse flotation is carried out with an anionic collector, Ca2+ is added as an activator for quartz, and the pH of the slurry is adjusted to about 11. After reverse flotation, the product in the tank is iron concentrate and the foam product is tailings.
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OD :1/2"-24" Seamless Pipe,Seamless Steel Pipe,316 Stainless Steel Pipe,Stainless Steel 304 Pipes Liaocheng Xinglong Seamless Tube Manufacturing Co., Ltd. , https://www.lcxlpipe.com
WT :STD,SCH40,XS,SCH80 etc
Length: 12m maximum,fixed length or random length
Process Method: hot finish and hot expand and cold draw
Surface Treatment: Varnished, 3PE, 3PP, FBE, Galvanized etc coated.
Package: Pipe's external surface painted with mill's black lacquer,beveled ends(OD≥2"),plain ends (OD<2"),both ends protected with plastic caps,bundled with metal strips, without wooden/pallet packages.
Quantity tolerance: -0/+10% per size,length tolerance for fixed length pipe:-0/+50mm