Beneficiation method for extremely lean iron ore pre-separation tailings

Abstract

The invention discloses a beneficiation method for extremely lean iron ore pre-separation tailings, and belongs to the technical field of mineral processing. The method comprises the following step: (1) smashing extremely lean iron ore pre-separation tailings, and grinding; (2) performing low intensity magnetic separation and high intensity magnetic separation, and combining strong magnetic concentrate and weak magnetic concentrate into mixed coarse ore; (3) filtering the mixed coarse ore, heating the mixed coarse ore to 580-700 DEG C, preserving heat for 20-120 seconds, putting the mixed coarse ore under a reducing atmosphere condition for preserving heat for 3-60 minutes, and cooling in the air to a temperature below 50 DEG C; (4) adding water to prepare ore pulp, stirring and performing pre-separation; (5) finely grinding, performing concentration, and filtering water from concentrate. According to the method, the high intensity magnetic separation and low intensity magnetic separation, calcination and reduction, and pre-separation-grinding and concentration are performed to obtain a product of which the iron grade is larger than 60 percent. The product has a stable index and high economical performance, and resources can be effectively utilized.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a mineral processing method for preselected tailings of extremely lean iron ore. Background technique [0002] The grade of iron ore mined by the Qianyanshan Iron Mine of Anshan Iron and Steel Group Mining Company is relatively low, so a pre-selection was carried out in the stope using a magnetic pulley. The tailings that come down are piled up in the mine, which is a kind of extremely poor Anshan-style iron ore pre-selection tailings. There are already millions of tons of stock in stock, and the number is increasing by 1 million tons every year. [0003] The grade of pre-selected tailings in Qianyanshan magnetic pulley is about 20%, and its main features are as follows: [0004] (1) The metal minerals of this iron ore are mainly iron minerals, the content of metal sulfide is very low, the iron minerals are mainly hematite, and the contents of magnetite and limonite a...

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Problems solved by technology

[0006] (3) Hematite and siderite are the main recycled minerals. The mineral properties of the two are very different, and the separation methods are also different. The process of mineral recovery is complicated, which increases the difficulty of separation;

In addition, some hematite fine particles are wrapped in limonite, which is difficult to dissociate, and is easy to be lost in the tailings with limonite, which affects the yield of iron;

[0008] (5) The intercalation relationship between siderite and other non-metallic minerals is more complicated. Siderite and calcite, dolomite and other carbonate minerals are closely symbiotic, and mostly fine particles are intercalated and wrapped with each other; siderite It is often filled in the grains of quartz in the form of veins and network veins, covering fine-grained quartz; siderite is often mixed with chlorite, muscovite, etc., and is complexly embedded with each other, so siderite and non- Difficult to dissociate between metal minerals

[0009] (6) The disseminated particle size of hematite and siderite is very uneven

[0010] In view of the above-mentioned characteristics of the magnetic pulley pre-selection tailings in Qianyanshan, it is impossible to achieve separation by conventional mineral processing processes.

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