Separation method of high-silicon low-grade oxidized iron ore

Abstract

The invention provides a separation method of high-silicon low-grade oxidized iron ore. Raw ore is crushed and sieved, lump ore and powdery ore are obtained, and the lump ore is divided into two sizes of particles; the powdery ore and the lump ore with the two sizes of particles are pre-separated respectively, and powdery ore pre-separated concentrate and full-particle-size lump ore pre-separated concentrate are obtained; the powdery ore pre-separated concentrate is ground by a ball mill and then subjected to high-intensity magnetic separation including one-time roughing separation and two-time scavenging, and high-intensity magnetic concentrate is obtained; the full-particle-size lump ore pre-separated concentrate is subjected to three-section ore grinding and three-section low-intensity magnetic separation after sintering, and low-intensity magnetic concentrate is obtained; the low-intensity magnetic concentrate is subjected to reverse flotation, and flotation concentrate is obtained; the high-intensity magnetic concentrate and the flotation concentrate are mixed in the ratio being 1:1, and comprehensive concentrate is obtained. Different particle sizes of iron ore are deeply pre-separated through different processes, tailings are discarded in a grading manner, ore inclusions are avoided, waste stone is discarded to the greatest extent, and the follow-up ore separation load is reduced. Different means are adopted for purification in different links, the whole technology has high adaptability, finally, the iron grade is up to 53.58%, the content of SiO2 is reduced to 12%, and the metal recovery rate of the whole process is up to 70.9%.

Description

technical field [0001] The invention relates to the field of beneficiation of low-grade iron oxide ore, in particular to a method for separating high-silicon and low-grade iron oxide ore. Background technique [0002] my country's iron ore resources are abundant but not rich, 97% of which are poor ore, and the ore distribution is fine, and the occurrence characteristics of complex types make my country's iron ore difficult to select. With the domestic rich ore decreasing day by day, it is particularly important to develop and utilize medium and low-grade iron ore resources. Although at present, the vast number of beneficiation workers at home and abroad have done a lot of work on low-grade iron ore beneficiation, due to the limited level of technology and equipment, the large-scale development and utilization of low-grade iron ore has not been well resolved, resulting in low-grade iron ore. The utilization rate of refractory iron ore is not high. [0003] In recent years, ...

AI Technical Summary

Problems solved by technology

Due to the characteristics of low-grade iron ore and easy sliming, it is difficult for a single physical method to meet the requirements of beneficiation and obtain high-grade iron ore concentrate; although the acid leaching method is low in cost, it has high requirements for raw materials, especially SiO in raw materials. 2 The content is low, and the acid leaching equipment is severely corroded

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