A kind of recovery method of metallic iron in weak magnetic iron and magnetic iron mixed steel slag

A technology of weak magnetic and magnetic iron, which is applied in the field of recycling metallic iron in weak magnetic iron and magnetic iron mixed steel slag, can solve problems such as imperfect processes, and achieve the effects of large single-machine processing capacity, high metal recovery rate, and reduced burden

Active Publication Date: 2017-05-31
赣州金环磁选科技装备股份有限公司
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Problems solved by technology

[0004] The traditional process is not perfect, so a more high-quality and efficient process is needed to process steel slag, improve the recovery rate of metallic iron, reduce weak magnetic impurities such as iron in the tailings, and improve the practical value of steel slag tailings

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  • A kind of recovery method of metallic iron in weak magnetic iron and magnetic iron mixed steel slag
  • A kind of recovery method of metallic iron in weak magnetic iron and magnetic iron mixed steel slag

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Embodiment Construction

[0019] In order to illustrate the present invention better, below in conjunction with example the present invention is described in further detail. Table 1 compares the production index of metal iron in the steel slag recovered by the present invention from a special steel plant in Ningbo, Zhejiang Province, and that produced by traditional methods. As can be seen from the data in Table 1, adopting the present invention to reclaim metallic iron compared with the traditional method, under the situation of 9.16% lower steel slag raw material iron grade than the traditional method, the obtained comprehensive metallic iron grade is equivalent, but the metal recovery rate is 3.59% higher than the traditional method %, the index of the present invention is obviously better than the traditional method.

[0020]

[0021] A special steel plant in Ningbo, Zhejiang produces about 350,000 tons of steel slag per year, and the grade of steel slag iron is 11.45%.

[0022] A method for re...

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Abstract

The invention discloses a recycling method of metallic iron in mixed steel slag of weakly magnetic iron and magnetic iron. The recycling method comprises the following steps of adopting two-stage crushing, carrying out rough grinding with a rod mill so as to avoid over crushing of materials and ensure that chunk metallic steel slag is effectively ground, and carrying out stage classification to obtain a chunk steel slag metallic iron finished product; sieving slurry, and carrying out separation to obtain a qualified metallic iron finished product with a washbox; discarding large amounts of tailings subjected to the washbox through the technological procedures of magnetic separation, fine grinding and secondary magnetic separation so as to improve the grade of the material iron product, and carrying out reselecting to obtain an iron ore concentrate finished product with a spiral chute; and recycling the generated tailings. According to the processing method, steel slag metallic iron products of different stages are obtained through fully using the characteristics that the materials are different in particle size, specific gravity, magnetism, and the like; the method is simple in technology, easy to operate, low in cost, high in metal recovery rate and friendly to production environment; chemical substances are avoided in the whole production technology, and no harmful impurity is generated; and the processing method is suitable for large scale industrial production and wide in application prospect.

Description

technical field [0001] The invention relates to the application field of ore dressing technology, in particular to a method for recovering metallic iron in weakly magnetic iron and magnetic iron mixed steel slag by using the combined technology of magnetic separation and gravity separation. Background technique [0002] The iron and steel industry is a pillar industry of the national economy. A large amount of solid waste (steel slag) is produced in the steelmaking and ironmaking industry. Steel slag is mainly composed of calcium, iron, silicon, magnesium and a small amount of oxides of aluminum, manganese, phosphorus, etc. The main mineral phase is a solid solution formed by tricalcium silicate, dicalcium silicate, etc., and oxides of silicon, magnesium, iron, manganese, and phosphorus, and also contains a small amount of free calcium oxide and metallic iron. The direct stacking of steel slag occupies a large amount of land, causing serious environmental pollution and other...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00
Inventor 廖国平钱枝花任祥君饶宇欢黄会春陈荣彭征范志坚
Owner 赣州金环磁选科技装备股份有限公司
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