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System and method for preparing low-sulfur iron powder

A low-sulfur iron and metal iron technology, applied in the field of resource recycling, can solve problems such as poor product quality, high sulfur content in metal iron powder, and inability to sell products

Pending Publication Date: 2017-02-01
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

One of the disadvantages of these techniques of reduction roasting-magnetic separation recovery of iron from metallized pellets is that the raw material itself contains sulfur, and the composition of sulfur is complex and difficult to remove at the source by flotation or other means, while in the reduction process It is necessary to add sulfur-containing coal as a reducing agent, so the metal iron powder obtained by this process has a high sulfur content and poor product quality, which cannot be directly sold as a product; another shortcoming is that the obtained iron powder product grade and recovery rate are not high. High, cannot fully recycle iron

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  • System and method for preparing low-sulfur iron powder

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preparation example Construction

[0075] The system for preparing low-sulfur iron powder according to the embodiment of the present invention pretreats the metallized pellets by using a microwave pretreatment device. On the one hand, microwave irradiation of the metallized pellets can increase the temperature of the metallized pellets. The thermal conductivity of iron and other gangue minerals in pellets is different, resulting in different thermal shock damage caused by thermal stress caused by temperature gradients, so that metallized pellets can be selectively broken; on the other hand, microwave radiation The energy can make the Fe—S bond in the sulfur-containing minerals gain energy, thereby enhancing the reactivity of the sulfur-containing minerals, which is conducive to the subsequent flotation process. Pretreatment not only promotes the dissociation of mineral monomers, thereby improving the subsequent grinding efficiency, but also improves the buoyancy of sulfur-containing minerals, making it unnecessa...

Embodiment 1

[0118] The composition of copper slag metallized pellets is: the mass fraction of total iron is 25.91%, the mass fraction of metallic iron is 22.51%, the metallization rate is 90.37%, Al 2 o 3 The mass fraction is 20.11%, SiO 2 The mass fraction is 26.73%, the CaO mass fraction is 6.63%, and the S mass fraction is 2%. refer to Figure 5 , the specific operation steps are as follows:

[0119] (1) Supply the copper slag metallized pellets to a microwave pretreatment device for pretreatment to obtain microwave pretreated pellets, wherein the microwave frequency in the pretreatment process is 2.0GHz, the microwave power is 500W, and the processing time is 20min;

[0120] (2) supplying the microwave pretreated pellets to the crushing device for crushing so as to obtain crushed material, wherein the particle size of the crushed material is not higher than 2mm;

[0121] (3) Supply the crushed material obtained above to a first-stage grinding device for a first-stage grinding trea...

Embodiment 2

[0124] The composition of red mud metallized pellets is: the mass fraction of total iron is 28.22%, the mass fraction of metallic iron is 25.75%, the metallization rate is 91.26%, Al 2 o 3 The mass fraction is 20.71%, SiO 2 The mass fraction is 26.34%, the CaO mass fraction is 7.45%, and the S mass fraction is 3%. refer to Figure 5 , the specific operation steps are as follows:

[0125] (1) Supply the red mud metallized pellets to a microwave pretreatment device for pretreatment to obtain microwave pretreated pellets, wherein the microwave frequency during the pretreatment process is 2.5GHz, the microwave power is 500W, and the processing time is 20min;

[0126] (2) supplying the microwave pretreated pellets to the crushing device for crushing so as to obtain crushed material, wherein the particle size of the crushed material is not higher than 2mm;

[0127] (3) Supply the crushed material obtained above to a first-stage grinding device for a first-stage grinding treatmen...

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Abstract

The invention discloses a system and a method for preparing low-sulfur iron powder. The system comprises a microwave pretreatment unit, a crushing device, an ore grinding and magnetic separating unit and a flotation unit, wherein the microwave pretreatment unit is provided with a metalized pellet inlet and microwave pretreated pellet outlet; the crushing device is provided with a microwave pretreated pellet inlet and a crushed material outlet; the ore grinding and magnetic separating unit is provided with a crushed material inlet, a sulfur-containing metal iron powder outlet and a tailings outlet; the flotation unit is provided with a sulfur-containing metal iron powder inlet, a pH regulating agent inlet, a collecting agent inlet, a foaming agent inlet, a low-sulfur iron powder outlet and a ferrous sulfide outlet. The system can be used for treating a metalized pellet to obtain low-sulfur iron powder (the sulfur content can be reduced to about 0.1%), and the product quality is improved, so full utilization of iron-containing resources is widened, and full recycle (the grade and recovery rate of iron can be as high as 90%) of iron element and sulfur element is realized as well.

Description

technical field [0001] The invention belongs to the technical field of resource regeneration and utilization, in particular, the invention relates to a system and method for preparing low-sulfur iron powder. Background technique [0002] my country's iron ore resources mainly have the characteristics of "poor", "fine" and "miscellaneous". The average iron grade is 32%, which is 11 percentage points lower than the world average iron grade. Iron ore, as the main raw material in the iron and steel industry, usually needs to be beneficiated and enriched before entering the blast furnace for smelting. With the rapid development of the iron and steel industry, some easy-to-select iron ores and rich ores with high iron grades are constantly being consumed. Therefore, how to effectively develop and utilize some low-grade refractory iron ores such as bauxite, high-phosphorus oolitic hematite, etc. and some industrial solid wastes such as Bayer red mud, copper slag, nickel slag, lead...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00
CPCB03B7/00
Inventor 王健月王福佳古明远曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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