Efficient magnetization roasting process for magnetic pulse pretreatment of refractory iron ore

A technology of magnetization roasting and iron ore, applied in the field of mineral processing, can solve the problems of high grinding cost, long magnetization roasting time and high temperature of refractory iron ore, achieve high-efficiency magnetization roasting, shorten magnetization roasting time, and reduce magnetization The effect of firing temperature

Inactive Publication Date: 2020-01-31
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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Problems solved by technology

[0003] Aiming at the problems of long magnetization roasting time, high temperature and high grinding cost of refractory iron ore, the present invention provides a high-efficiency magnetization roasting process for refractory iron ore magnetic pulse pretreatment

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  • Efficient magnetization roasting process for magnetic pulse pretreatment of refractory iron ore

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Embodiment 1

[0020] Adopt a kind of refractory iron ore magnetic pulse pretreatment high-efficiency magnetization roasting process of the present invention, the -15mm Jing Tieshan refractory iron ore of grade 32% is subjected to the following treatment: specifically comprise the following steps:

[0021] Step A. Use magnetic pulse pretreatment-15mm Jingtieshan refractory iron ore, and break up;

[0022] Step B. Using a rotary kiln to directly carry out full-size magnetized roasting of -15mm refractory iron ore, roasting time is 50 minutes, roasting temperature is 740°C, reducing agent coal powder ratio is 1.5%, and the roasted ore is cooled to 35°C;

[0023] Step C. Carry out dry pre-selection, discarding, dry grinding and dry separation treatment on the roasted ore, and obtain the indicators of iron concentrate grade of 58% and metal recovery rate of 85%.

[0024] Compared with the indicators of magnetized roasting and dry grinding and dry separation of untreated mirrorite, the magnetized...

Embodiment 2

[0026] Using the high-efficiency magnetization roasting process for refractory iron ore magnetic pulse pretreatment of the present invention, the -15mm Jingtieshan refractory iron ore with a grade of 33% is subjected to the following treatment, which specifically includes the following steps:

[0027] Step A. Pretreat the -15mm Jingtieshan refractory iron ore by magnetic pulse pretreatment and break it up;

[0028] Step B. Using a rotary kiln to directly roast the -15mm refractory iron ore with full-grain magnetization, the roasting time is 55min, the roasting temperature is 710°C, the reducing agent coal powder ratio is 1.5%, and the roasted ore is cooled to 45°C;

[0029] Step C. Carry out dry pre-selection, discarding, wet grinding and wet separation treatment on the roasted ore, and obtain the indicators of iron concentrate grade of 60% and metal recovery rate of 90%.

[0030] Compared with the indicators of magnetization roasting and wet grinding and wet separation of unt...

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Abstract

The invention provides an efficient magnetization roasting process for magnetic pulse pretreatment of refractory iron ore. A magnetic pulse processing device is adopted to pre-treat the -15 mm refractory iron ore, magnetic pulses are applied to the refractory iron ore, periodic stretching, pressing, shearing, bending, twisting and other mechanical action forces are generated on interfaces of different minerals, a large number of interface cracks are generated on the mineral interfaces in the ore, and overflowing and permeating of magnetization roasting gas are facilitated; a rotating kiln is used for directly carrying out low-temperature short-time rapid full-grain-level magnetization roasting on the -15 mm refractory iron ore, and the roasted ore is cooled to 35-45 DEG C; and dry pre-selection waste abandoning is carried out, the roasted ore after waste abandoning is subjected to low-cost dry grinding and dry sorting or wet grinding and wet sorting, the grade of iron ore concentrate is more than 58%, and the metal recovery rate is over 85%. The efficient magnetization roasting process aims at the problems of long magnetization roasting and grinding selection time, high cost and the like of a -15 mm refractory iron ore rotating kiln, and the magnetization roasting and grinding processing cost of the refractory iron ore is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a high-efficiency magnetization roasting process for refractory iron ore magnetic pulse pretreatment. Background technique [0002] my country's iron ore resources are rich in lean ore and less in magnetic ore. Weak magnetic iron ore accounts for more than 70% of the total reserves. Weak magnetic iron ore can be magnetically separated after it has been magnetized and roasted to become a strong magnetic mineral. Obtain iron ore concentrates whose quality meets the requirements for sintering ingredients. Refractory iron ore with a particle size of +15mm is directly magnetized and roasted in a shaft furnace, and iron ore with a particle size of -15mm is limited by poor air permeability and cannot be processed with a shaft furnace magnetization roasting. In China, Daxigou in Shaanxi and Atush in Xinjiang are all used in rotary The kiln is magnetized and roasted...

Claims

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Application Information

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IPC IPC(8): C22B1/02
CPCC22B1/02
Inventor 展仁礼郭忆王欣边立国池永沁
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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