Method for preparing super iron ore concentrate by using low-grade magnetic iron ore

A technology for super iron ore concentrate and magnetite ore, which is applied in chemical instruments and methods, wet separation, solid separation, etc., can solve the problems of complex treatment process, long technical process, inability to prepare super iron ore concentrate, etc. The effect of simple process and easy operation

Active Publication Date: 2012-07-04
SHENYANG RES INST OF NONFERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] On the whole, the main disadvantage of the technical solution given by the above patent application is that it is impossible to directly produce super iron ore concentrat

Method used

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  • Method for preparing super iron ore concentrate by using low-grade magnetic iron ore
  • Method for preparing super iron ore concentrate by using low-grade magnetic iron ore

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Experimental program
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Effect test

Embodiment 1

[0023] The test iron ore is a certain subway ore in Heilongjiang. The iron ore contains 21.31% iron, of which 16.41% is magnetic iron. Adopting the technological process of stage grinding-stage magnetic separation-iron concentrate reverse flotation to produce super iron concentrate, better technical indicators have been obtained. The main technical parameters are: the grinding fineness of the first stage is -0.075mm, accounting for 60%, and the magnetic field strength is 1250 Oe; the grinding fineness of the second stage is -0.038mm, accounting for 74.45%, and the magnetic field strength is 850Oe; After reverse flotation, add NaOH 500 g / ton, starch 1000 g / ton, CaCl 2 50 g / t, desiliconizing agent 1250 g / t, to obtain super iron concentrate with iron content of 71.52%, iron recovery rate of 32.04% and ordinary iron concentrate with iron content of 68.41%, iron recovery rate of 42.94%; total iron recovery rate It was 74.98%.

[0024] Test results: Iron grade of super...

Embodiment 2

[0028] The test ore is a subway ore in Inner Mongolia. The iron ore belongs to ultra-lean magnetite, with an iron grade of only 11.18%, of which only 6.33% is magnetic iron. Adopting the technological process of stage grinding-stage magnetic separation-iron concentrate reverse flotation to produce super iron concentrate, better technical indicators have been obtained. The main technical parameters are: the grinding fineness of the first stage is -0.075mm, accounting for 60%, and the magnetic field strength is 103.50 kA / m; the grinding fineness of the second stage is -0.045mm, accounting for 92%, and the magnetic field strength is 63.69 kA / m; The iron ore concentrate is then subjected to reverse flotation, adding NaOH 480 g / ton, starch 1050 g / ton, CaCl 2 45 grams / ton, desiliconization agent 1200 grams / ton, obtain the super iron essence that contains iron 71.02%, and iron recovery rate is 23.75%.

[0029] Test results: Iron grade of super iron concentrate: 71.02%.

...

Embodiment 3

[0033] The test iron ore is a subway ore in Xinjiang. The iron ore contains 28.5% iron, of which 22.36% is magnetic iron. Adopting the technological process of stage grinding-stage magnetic separation-iron concentrate reverse flotation to produce super iron concentrate, better technical indicators have been obtained. The main technical parameters are: the grinding fineness of the first stage is -0.075mm, accounting for 55%, and the magnetic field strength is 1100 Oe; the grinding fineness of the second stage is -0.038mm, accounting for 80%, and the magnetic field strength is 1000Oe; After reverse flotation, add NaOH 520 g / ton, starch 1100 g / ton, CaCl 2 55 grams / ton, desiliconization agent 1300 grams / ton, get the iron concentrate with 71.80% iron, the iron recovery rate is 38.4%.

[0034] Test results: Iron grade of super iron concentrate: 71.80%.

[0035] Iron recovery rate: 38.4%.

[0036] Silica content: 0.15%.

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Abstract

A method for preparing super iron ore concentrate by using low-grade magnetic iron ore is characterized by comprising the following steps of: (1) performing primary grinding: grinding crushed iron ore with the iron grade of lower than 30 percent in a grate ball grinder or an overflow ball grinder; (2) performing primary low-intensity magnetic separation: feeding the iron ore overflowing from a grader into a low-intensity magnetic separation machine, and separating; (3) performing secondary grinding: feeding crude magnetic iron ore concentrate obtained in the low-intensity magnetic separation into a small grinder for regrinding the ore, and further performing fine grinding; (4) performing secondary low-intensity magnetic separation: feeding the reground ore overflowing from the grader into a secondary low-intensity magnetic separation machine, and separating secondarily; (5) performing reverse flotation: feeding the magnetic iron ore concentrate obtained in the secondary low-intensity magnetic separation into a flotation machine after adding chemicals, regulating slurry and stirring, and performing the reverse flotation; and (6) treating products: concentrating, filtering and drying substances at the bottom of a reverse flotation trough to obtain the super iron ore concentrate. According to the method, iron ore resources which are commonly regarded to be useless or have low use value are changed into useful resources.

Description

technical field [0001] The present invention relates to a method for extracting iron concentrate, in particular to a method for producing super iron concentrate with low-grade magnetite ore, that is, the grade of total iron is lower than the industrial use grade of magnetite (iron content ≥ 25 %) iron ore is enriched by weak magnetic separation to obtain magnetite concentrate, and the magnetite concentrate is desiliconized by reverse flotation to obtain super iron concentrate, which belongs to the field of mineral processing technology. Background technique [0002] Super iron concentrate, also known as high-purity iron concentrate or high-quality iron concentrate, refers to magnetite concentrate with iron grade higher than 71.5% and silica and other impurities (acid insoluble) content less than 0.2-3%. Super iron concentrate is not only a deep-processing product of mineral processing, but also a new type of functional material with great development potential. It has great ...

Claims

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Application Information

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IPC IPC(8): B03B7/00B03B1/00
Inventor 陈新林尹文新于雪马忠臣李闯
Owner SHENYANG RES INST OF NONFERROUS METALS
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