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Method for producing iron ore concentrate through suspension magnetizing roasting with siderite as reducing agent

A magnetized roasting and siderite technology, applied in the field of mineral processing, can solve the problems of environmental pollution, increase the production cost of magnetized roasting, and it is difficult to meet the requirements of clean and green development of the steel industry, and achieve the effect of eliminating carbon emissions and environmental pollution.

Inactive Publication Date: 2018-09-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a large amount of reducing agent needs to be added in the magnetization roasting process of refractory iron ore, and the reducing agent commonly used in magnetization roasting is mainly from coal, which not only increases the production cost of magnetization roasting, but also emits a large amount of greenhouse gas CO 2 cause environmental pollution
Therefore, the magnetic roasting technology of refractory iron ore still has problems such as high cost, large carbon emissions, and environmental pollution, and it is difficult to meet the requirements of clean and green development of the steel industry

Method used

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  • Method for producing iron ore concentrate through suspension magnetizing roasting with siderite as reducing agent
  • Method for producing iron ore concentrate through suspension magnetizing roasting with siderite as reducing agent
  • Method for producing iron ore concentrate through suspension magnetizing roasting with siderite as reducing agent

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Embodiment 1

[0033] The ore sample used in this example is the iron ore in Donganshan, Anshan Iron and Steel Group. The results of chemical multi-element analysis of the ore are shown in Table 1, and the results of iron chemical phase analysis are shown in Table 2. It can be seen from the analysis results that the ore has a TFe grade of 34.60%, a FeO content of 6.40%, and the main impurity SiO 2 The content is 43.34%, and the remaining impurities are all less than 1%. The main iron-containing minerals in this ore are hematite, limonite and magnetite, and their iron distribution ratios are 64.76% and 27.29%, among which the iron distribution ratio of siderite is 6.45%.

[0034] Table 1 Chemical multi-element analysis of iron ore in East Anshan (mass fraction, %)

[0035]

[0036] Table 2 Iron phase analysis of iron ore in East Anshan (mass fraction, %)

[0037]

[0038] The chemical composition analysis results of siderite ore are shown in Table 3, and the iron chemical phase analys...

Embodiment 2

[0051] The ore sample used in this embodiment is Jingtieshan Iron Mine in Jiuquan Iron and Steel Corporation. The results of chemical composition analysis of the ore are shown in Table 6, and the results of iron chemical phase analysis are shown in Table 7. From the analysis results, it can be seen that the TFe grade of Jingtieshan iron ore is 33.51%, the FeO content is 17.82%, and the main impurity is SiO 2 , MgO, Al 2 o 3 And CaO, the content of other impurity minerals is less than 1%. The actual ore mainly contains iron minerals hematite and siderite, and its iron distribution rate is 61.26% and 36.61%, and it also contains a small amount of magnetite, iron sulfide and iron silicide.

[0052] Table 6 Jingtieshan iron ore chemical composition analysis (mass percentage, %)

[0053]

[0054] Table 7 Jingtieshan iron ore iron chemical phase analysis (mass percentage, %)

[0055]

[0056] The results of chemical composition analysis of siderite ore are shown in Table 8...

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Abstract

The invention provides a method for producing iron ore concentrate through suspension magnetizing roasting with siderite as a reducing agent, and belongs to the technical field of mineral processing.A continuous type suspension roaster is adopted for suspension roasting at the temperature ranging from 500 DEG C-600 DEG C for 60 s to 100 s after preheating is carried out, CO decomposed from the siderite is used for restoring materials, two-stage magnetic separating is then adopted, and the high-grade iron ore concentrate is obtained. By means of the method, the CO decomposed from the sideritein ore is sufficiently used for restoring feebly magnetic iron mineral such as hematite and limonite into magnetite, carbon emission and environmental pollution which are caused by use of a coal reducing agent are eliminated, and a new way is developed for cleaning and efficient using of iron ore difficult to separate.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for producing iron concentrate by suspending, magnetizing and roasting siderite as a reducing agent. Background technique [0002] my country is rich in iron ore resources, but the proportion of complex and refractory iron ore resources is relatively high. In order to meet the major demand for iron ore in the iron and steel industry, scientific and technological workers have carried out long-term research work on the utilization of refractory iron ore. During the research process, people gradually realized that only through pretreatment of metallurgy and other methods to completely change the occurrence state of iron minerals in the ore, so as to improve the difference in physical and chemical properties between iron minerals and gangue minerals, and then achieve its high efficiency. select. Based on the above understandings, combined separation ...

Claims

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Application Information

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IPC IPC(8): C22B1/02
CPCC22B1/02
Inventor 孙永升祝昕冉韩跃新
Owner NORTHEASTERN UNIV
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