Micro-fine particle hematite greater circulation mine returning negative ion reverse flotation technology

Abstract

The invention relates to a micro-fine fine particle hematite greater circulation mine returning negative ion reverse flotation technology. The technology is characterized in that magnetic concentrate with the Fe-grade being 40-41% and the granularity being P80=20-30 micrometers is fed into a thickener to be subjected to concentration after magnetic separation, then is fed to a negative ion reverse flotation operating system in an underflow mode and then is fed into circulating water in an overflow mode. Firstly, the magnetic concentrate is fed into flotation rough concentration operation, underflow concentrate of the flotation rough concentration operation is fed into flotation fine concentration operation, foam tailings of the flotation rough concentration operation is fed into scavenging operation, and the scavenging operation is divided into three times of scavenging operation; foam tailings of the first time scavenging is fed into the second time scavenging, foam tailings of the second time scavenging is fed into the third time scavenging, underflows of the first time scavenging and the second time scavenging both return to the flotation rough concentration operation, and the underflow concentrate of the third time scavenging operation returns to the first time scavenging. The foam tailings scavenged by the third time scavenging operation are the final flotation tailings, the underflow concentrate of the flotation fine concentration operation is the final concentrate, the grade of the final concentrate is 65.9%, and the iron recovery rate is 88.5%.

Description

technical field [0001] The invention belongs to the technical field of reverse flotation of hematite, in particular to a reverse flotation process of fine-grained hematite with large circulation returning anions. Background technique [0002] The anion reverse flotation process of hematite-based oxidized ore is widely used in my country's Anshan Iron and Steel, Benxi Iron and Steel, Hebei Iron and Steel and other concentrators. The useful minerals in these mines are relatively coarse in size, and gravity separation-magnetic separation (weak Magnetic and strong magnetic) - anion reverse flotation process, the particle size of the reverse flotation after magnetic separation is mostly 95% -0.074mm (P80 is about 43μm), usually through a rough selection, a selection, three to four times Sweeping can get qualified iron concentrate, and reverse flotation is the return of the bottom flow concentrate of sweeping flotation, that is, the bottom flow concentrate of this section of flotati...

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Problems solved by technology

Through the experimental research on the fine-grained hematite ore in Yuanjiacun, Taiyuan Iron and Steel Co., Ltd., the feeding particle size is P80=20-30 microns, and it is found that if the conventional hematite reverse flotation small cycle process is adopted, the flotation process is a roughing , One-time selection, four-five times of sweeping, not only the flotation time must reach 134 minutes, but also four-five times of sweeping flotation must be used to make the grade of iron concentrate reach 65%, and the operating recovery rate can only reach 77% %, the flotation time of this process is too long, the recovery rate is low, many flotation machines are used, the investment is high, the operation cost is high, and the cost is high

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