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Sodium-salt-modified paigeite and application thereof in reducing and sorting of hard-to-process iron-containing resource

A sodium salt modification, boron iron ore technology, applied in the field of iron and steel metallurgy, can solve the problems of increased material fusion and reactor adhesion, low metal recovery rate, unfavorable production line, etc., to shorten the reduction time, wide source, The effect of reducing production costs

Active Publication Date: 2014-04-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the subsequent physical separation process has higher requirements on the size of metallic iron grains, the aggregation and growth of metallic iron grains must be achieved in the direct reduction process, otherwise it will lead to poor separation effect and low recovery rate of valuable metals. Low production efficiency and low product quality; if the growth of metallic iron grains is achieved simply by increasing the reduction temperature, it will inevitably increase the risk of material melting and reactor adhesion, which is extremely unfavorable for smooth production

Method used

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  • Sodium-salt-modified paigeite and application thereof in reducing and sorting of hard-to-process iron-containing resource
  • Sodium-salt-modified paigeite and application thereof in reducing and sorting of hard-to-process iron-containing resource
  • Sodium-salt-modified paigeite and application thereof in reducing and sorting of hard-to-process iron-containing resource

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Sodium sulfate and sodium carbonate are mixed in 30% and 1% of boronite which is crushed and ground to -0.074mm in mass ratio and accounts for 50% of the boron ore. Reduction roasting at a temperature of 800°C for 30 minutes, crushing of reduction agglomerates, and grinding to -0.074mm mass percentage accounted for 75% to obtain sodium salt modified boronite additive; Added to oolitic hematite for mixing and agglomeration, and the dry agglomerate was reduced-grinding under the same conditions and parameters as in Comparative Example 1. The iron grade in the obtained metal iron powder was 90.67%, and the phosphorus content was 0.16%. , Magnetic separation iron recovery rate 80.79%, phosphorus removal rate 92.43%.

Embodiment 2

[0032]Sodium sulfate and sodium carbonate are mixed in 10% and 15% of the boron ore that is crushed and ground to -0.074mm in mass ratio, respectively, and after mixing, agglomeration, and drying, bituminous coal is used as the reduction agent. Reduction roasting at 850°C for 30 minutes, crushing the obtained agglomerates and grinding them to -0.074mm, accounting for 75%, and the obtained product is the modified boronite additive; add the above additives at a mass percentage of 30% Mix and agglomerate in the oolitic hematite, and the dry agglomerate is reduced-grinding under the same condition parameters as in Comparative Example 1, and the iron grade in the obtained metal iron powder is 90.15%, and the phosphorus grade is 0.17%. The iron recovery rate of magnetic separation is 83.59%, and the phosphorus removal rate is 90.41%.

Embodiment 3

[0034] Sodium sulfate and sodium carbonate are mixed in 25% and 15% of the boron ore that is crushed and ground to -0.074mm, and the mass ratio is 40%. After mixing, agglomeration and drying, bituminous coal is used as The additive was reduced and roasted at 900°C for 30 minutes, and the obtained agglomerate was crushed and ground to -0.074mm to account for 75%, and the product obtained was the modified boronite additive. The above-mentioned additives were added to the oolitic hematite at 30% by mass for mixing and agglomeration, and the dry agglomerates were reduced-grinding under the same conditions and parameters as in Comparative Example 1, and the iron in the obtained metal iron powder Grade 93.38%, phosphorus grade 0.11%, magnetic separation iron recovery rate 87.98%, phosphorus removal rate 93.27%.

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Abstract

The invention provides a sodium-salt-modified paigeite. A preparation method of the sodium-salt-modified paigeite comprises the steps that: paigeite is well mixed with sodium sulfate and sodium carbonate with a certain ratio; agglomeration is carried out; and dried agglomerates are subjected to reductive roasting, such that the sodium-salt-modified paigeite is obtained. The invention also provides an application method of the sodium-salt-modified paigeite in the reducing and sorting of hard-to-process iron-containing resources (including oolitic hematite, nickel laterite, and red mud). The application method comprises the steps that: the sodium-salt-modified paigeite is finely grinded, and is fully mixed with oolitic hematite, nickel laterite, or red mud; agglomeration is carried out; the agglomerate are dried by baking; the dried agglomerates are subjected to reductive roasting under a certain temperature with non-coking coal as a reducing agent; a reduction product is subjected to crushing and grinding; and the product is sorted by using a wet weak magnetic separation method, such that high-quality permalloy powder or metal iron powder can be obtained. During a direct reduction process of the hard-to-process iron-containing resource, with the sodium-salt-modified paigeite, the reduction temperature can be substantially reduced, the agglomeration and growth of metal iron grains can be promoted, and high-efficiency magnetic separation of the metal iron and gangue mineral can be further realized. Therefore, the sodium-salt-modified paigeite is suitable for industrialized applications.

Description

technical field [0001] The invention discloses a sodium salt modified boronite and its application in reducing and sorting refractory iron-containing resources. It belongs to the technical field of iron and steel metallurgy. Background technique [0002] About 60% of boron resources in my country are stored in boron ore (including B 2 o 3 About 7%, total Fe is about 30%), boronite is difficult to separate by conventional beneficiation methods due to its many co- / associated minerals and complex structure, and has not yet been developed and utilized on an industrial scale. [0003] The key to the processing and utilization of boron-iron ore lies in the separation of iron and boron, and the treatment processes mainly include wet separation and pyrometallurgy. The wet separation method is to directly treat boron iron ore with acid / alkali to obtain boric acid or borax, and the leaching slag is then subjected to magnetic separation to obtain iron concentrate to separate boron a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02
Inventor 李光辉饶明军姜涛张元波范晓慧雷婷罗骏杨永斌郭宇峰李骞陈许玲朱忠平黄柱成张树辉曾精华梁斌珺刘明霞游志雄
Owner CENT SOUTH UNIV