Mine-processing process for extracting iron, reducing fluorine and reducing potassium and sodium of oxide iron ore with high fluorine and high potassium and sodium

Abstract

The invention discloses a mine-processing process for extracting iron, reducing fluorine and reducing potassium and sodium of oxide iron ore with high fluorine and high potassium and sodium, which comprises the following steps of: breaking, grinding and grading oxide iron ore and feeding to low-intensity magnetic separation operation to obtain low-intensity magnetic separation concentrates; extracting iron and reducing fluorine of the low-intensity magnetic separation ore concentrates by reverse flotation to obtain low-concentration reverse flotation concentrates; carrying out medium-intensity magnetic separation operation and high-intensity magnetic separation operation of low-intensity magnetic separation tailings to obtain medium-intensity magnetic concentrates and high-intensity magnetic concentrates; merging the medium-intensity magnetic concentrates and the high-intensity magnetic concentrates and feeding to reverse flotation operation to obtain reverse flotation concentrates; carrying out forward crude flotation and forward fine flotation operation of the reverse flotation concentrates to obtain forward flotation concentrates; and merging the low-concentration reverse flotation concentrates and the forward flotation concentrates to obtain finial oxide ore concentrates. According to the difference between the floatability and the floating speed of an iron mineral and a gangue mineral, the invention adopts a staged floatation combined new process of reducing fluorine by reverse flotation in a weak alkaline medium and reducing potassium and sodium by forward flotation in a weak acidic medium and has high iron concentrate grade, high iron recovery rate and low F, K2O and Na2O contents in the iron concentrates.

Description

technical field [0001] The invention relates to a beneficiation method for iron ore to increase iron and reduce impurities, in particular to a high-fluorine, high-potassium-sodium iron oxide ore process for increasing iron and reducing fluoride, and reducing potassium and sodium, which can be used for high-fluorine, high-potassium and sodium oxidation The beneficiation of iron oxide ore can also be used for the separation of weak magnetic iron minerals such as goethite, siderite and limonite. Background technique [0002] The main characteristics of my country's iron ore are "poor", "fine" and "miscellaneous". The average iron grade is 32%, which is 11 percentage points lower than the world average grade. Among them, 97% of the iron ore needs to be processed, and the complex and difficult-to-select red iron ore accounts for a large proportion, accounting for about 20.8% of the iron ore reserves. [0003] The impurity content of iron ore in my country is high. In addition to...

AI Technical Summary

Problems solved by technology

The iron ore contains a lot of alkali metals, which can easily cause the softening temperature to drop, and the reflow zone to move up, which is not conducive to the development of indirect reduction, resulting in an increase in the coke ratio

Alkali metal in the pellets will cause abnormal expansion of the pellets and cause severe pulverization, which will deteriorate the gas permeability of the material column

Alkali metals also seriously damage the performance of coke

In addition, the alkali metal compound in the upper part of the blast furnace adheres to the furnace wall, which promotes the thickening of the furnace wall, nodulation and damage to the brick lining

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