Dressing method for high-phosphor-content oolitic hematite

Abstract

The invention relates to a dressing method for high-phosphor-content oolitic hematite. The dressing method has the technical scheme that the method comprises the following steps that 1, high-phosphor-content oolitic hematite ore with the crushing granularity smaller than 20mm to 30mm is fed into an ore grinding machine, and the high-phosphor-content oolitic hematite is subjected to continuous two-section ore milling until the ore with the ore fineness smaller than 0.074 accounts for about more than 90 weight percent; 2, the milled ore pulp passes through a pulp removing hopper for removing sludge smaller than 0.020m, and the removed sludge is directly subjected to tail-escaping; 3, the ore pulp subjected to the sludge removal is subjected to twice continuous wet type strong magnetic sorting, tailings in the first strong magnetic sorting and tailings in the second strong magnetic sorting are directly discharged into a tailing storage pool; 4, the hematite ore pulp subjected to the strong magnetic sorting is subjected to re-sorting by a table concentrator to obtain coarse particle hematite concentrate; 5, the re-sorted table concentrator middlings and tailings after the coarse particle hematite concentrate sorting are mixed, then, a one-coarse one-sweep and three-concentration floatation process is adopted, fine particle hematite concentrate is obtained, the two parts of hematite concentrate including the coarse hematite concentrate and the fine hematite concentrate are mixed, dephosphorizing agents are added for stirring treatment, and the final oolitic hematite concentrate is obtained. The method has the characteristics that the process flow is simple, the in-site operation is simple, the cost is low, the grade of the oolitic hematite concentrate is high, and the recovery rate is high. The TFe grade of the obtained oolitic hematite concentrate is higher than 58 weight percent, P is less than 0.12 weight percent, and the recovery rate is higher than 70 weight percent.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a mineral processing method of high phosphorus oolitic hematite. Background technique [0002] One-ninth of my country's iron ore reserves is oolitic hematite, accounting for 30% of my country's red ore reserves. Oolitic hematite often forms large-scale mines, such as the Xuanlong iron mine in the north and the Ningxiang iron mine in the south. Oolitic hematite has extremely fine particle size and is often symbiotic or mutually wrapped with siderite, oolitic chlorite and phosphorus-containing minerals. Because oolitic hematite has extremely fine particle size and its layer-by-layer structure, it is not conducive to the dissociation of ore monomers, and the ore is particularly easy to form fine particles after crushing and grinding, and has a large mud content. This determines that the dressing and smelting of the iron ore is very difficult. [0003] Fore...

AI Technical Summary

Problems solved by technology

[0007] Looking at the above technologies and research results, my country currently adopts flocculation desliming-reverse flotation, single flotation and other processes for refractory oolitic hematite, and has achieved certain results, but the effect is not obvious

According to experts' prediction, the basic characteristics of weak magnetic iron ore resources in the 21st century and beyond will be low grade, dense symbiosis of various components, and fine-grained distribution of useful minerals. It is often difficult to obtain satisfactory results by conventional sorting methods. sorting index