Refractory iron ore fines grading combined processing method

A combined processing and iron ore technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of restricted promotion and application, uneven distribution of temperature field, and ineffective utilization of resources, etc., to expand the particle size range , The effect of improving resource utilization

Active Publication Date: 2014-07-30
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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Problems solved by technology

[0004] The shaft furnace mainly processes lump ore with a particle size of 15-100mm, and the rotary kiln is a thermal equipment used to process refractory iron ore with a particle size of 0-15mm. The shaft furnace is good; because the rotary kiln magnetizes and roasts the refractory iron ore with a particle size of 0-15mm, there are problems of fine-grained iron-containing mineral materials entering the kiln and uneven temperature field distribution, local high temperature, resulting in ring formation and high roasting costs, which restricts Its promotion and application in China; at the same time, the particle size classification of fine-grained iron-containing mineral materials is difficult to affect the particle size range of refractory iron ore magnetization roasting, so that resources cannot be effectively used

Method used

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Embodiment 1

[0018] A method for grading combined processing of refractory iron ore fines, comprising the following steps:

[0019] A. Feed the refractory iron ore powder ore whose particle size is less than 15mm into the mechanical vibrating screen by vibrating feeder to separate the refractory iron ore whose particle size is less than 5mm and more than 5mm (including 5mm) and less than 15mm;

[0020] B. Send the refractory iron ore separated in step A with a particle size above 5mm (including 5mm) and below 15mm into the raw material bin of the rotary kiln, and the refractory iron ore with a particle size below 5mm is fed by a vibrating feeder The double-screw classifier separates the refractory iron ore with a particle size of less than 1mm, more than 1mm (including 1mm), and less than 5mm;

[0021] C. Send the refractory iron ore with a particle size of less than 1mm separated in step B to the ball mill of the strong magnetic separation system for grinding and separation to obtain s...

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Abstract

The invention aims to provide a refractory iron ore fines grading combined processing method which is simple, high-efficiency, low in grading cost and high in comprehensive metal recovery rate. A mechanical vibration screen and a spiral classifier are combined for size grading, a method of combining strong magnetic separation and magnetic roasting-low intensity magnetic separation is adopted for processing refractory iron ore with the particle size of 0-15mm, the difficult problems of difficulty in grading particle sizes of a fine-grained iron-containing material and rotary kiln accretion are solved, the particle size range for magnetic roasting of the refractory iron ore is widened, and the resource utilization rate of the refractory iron ore is improved.

Description

technical field [0001] The invention relates to the technical fields of beneficiation, metallurgy and thermal engineering, in particular to a classification combined processing method of refractory iron ore powder ore. Background technique [0002] The properties of refractory iron ore in my country are complex, and the mineral composition is mainly weak magnetic minerals such as specularite, limonite, hematite and siderite. At present, domestic enterprises such as Jiuquan Iron and Steel Co., Ltd. adopt strong magnetic separation process to process the powdered refractory iron ore with a particle size of 0-15mm, the grade of iron concentrate is only 46%-49%, and the grade of tailings is about 20%-22%. The iron recovery rate is about 67%, resulting in a waste of resources. [0003] At present, the magnetization roasting equipment used for refractory iron ore in China mainly includes shaft furnace and rotary kiln. [0004] The shaft furnace mainly processes lump ore with a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07B15/00B03C1/00B03C1/015C22B1/00
Inventor 王明华展仁礼郭忆张科权芳民雷鹏飞王建平王欣
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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