Recycling method of metallic iron in mixed steel slag of weakly magnetic iron and magnetic iron
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: 2015-12-02
赣州金环磁选科技装备股份有限公司
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[0019] In order to better illustrate the present invention, the present invention will be further described in detail below in conjunction with examples. Table 1 shows the comparison between the production index of the metal iron recovered in the steel slag recovered by the present invention in a special steel plant in Ningbo, Zhejiang and the metal iron recovered in the traditional method. It can be seen from the data in Table 1 that compared with the traditional method, when the steel slag raw material iron grade is 9.16% lower than that of the traditional method, the obtained comprehensive metal iron grade is equivalent, but the metal recovery rate is 3.59 higher than that of 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 Province produces approximately 350,000 tons of steel slag per year, with a slag iron grade of 11.45%.
[0022] A method for recovering ...
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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 beneficiation technology, in particular to a method for recovering metallic iron in weak magnetic iron and magnetic iron mixed steel slag by using a combination of magnetic separation and gravity separation technology. 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 generated in the steel and iron industry. The steel slag is mainly composed of calcium, iron, silicon, magnesium and a small amount of oxides such as aluminum, manganese, and phosphorus. The main mineral phases are solid solutions formed by tricalcium silicate, dicalcium silicate, etc. and oxides of silicon, magnesium, iron, manganese, and phosphorus. It also contains a small amount of free calcium oxide and metallic iron. The direct stacking of steel slag takes up a lot of land, causing serious environmental pollution and other unfavorable situa...
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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