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Fluidization roasting separation method of siderite-containing mixed iron ores

A fluidized roasting and siderite technology is applied in the field of magnetized roasting of mixed iron ore containing siderite, which can solve the problems of less than 10% of the overall utilization rate, affecting the smelting performance of the concentrate, and deteriorating the flotation environment, etc. Good beneficiation effect, stable product quality and wide application range

Active Publication Date: 2015-08-19
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI +1
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low theoretical iron grade of siderite (48.27%), mixed iron ore containing siderite not only reduces the grade of the concentrate, but also affects the smelting performance of the concentrate. When flotation operations are required, the presence of siderite Will worsen the flotation environment
At present, the siderite that has been utilized in the iron and steel industry is part of the rich ore and part of the mixed ore that coexists with magnetite and hematite, but the overall utilization rate is less than 10%.
After JISCO adopts screening and grading for Jingtieshan iron ore, the lump ore enters the shaft furnace for roasting, and the fine ore adopts a strong magnetic separation process. The mixed iron concentrate grade of the two processes can only reach about 55%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A high-phosphorus oolitic hematite in western Hubei has a raw ore grade of about 45%, a phosphorus content of 1.20%, and a siderite distribution rate of about 3-5%. Using fluidized roasting-magnetic separation process, under the conditions of feeding speed of 100kg / h and feeding particle size of -0.5mm, after two-stage preheating, the first-stage preheating temperature is 350°C, and the second-stage preheating temperature The temperature is 800°C, the roasting temperature is 550~575°C, the reducing gas flow rate is 4.5m3 / h, the CO concentration in the reducing gas is 70%~90v / v%, and the residence time is 5min. The roasted products obtained under these conditions are ground to - About 0.074mm92%, after a coarse and a fine weak magnetic separation (rough magnetic field strength 120kA / m, selective magnetic field strength 80kA / m), TFe grade 56.83% and recovery rate 90.78% were obtained. The magnetic separation concentrate undergoes a rough and a fine reverse flotation. The...

Embodiment 2

[0036] A Qijiang type iron mine in Chongqing area, the ore grade is about 36%, and the siderite distribution rate is about 50%. The fluidized roasting-magnetic separation process is adopted, and the feeding speed is 125kg / h, and the feeding particle size is -0.15mm. After two stages of preheating, the first stage preheating temperature is 300°C, the second stage preheating temperature is 700°C, the roasting temperature is 570~600°C, the reducing gas flow rate is 3m3 / h, and the CO concentration in the reducing gas is 90v / v %, the residence time is 3min, the roasted product obtained under this condition is ground to about -0.074mm98%, and it is obtained through a rough and a fine weak magnetic separation (rough magnetic field strength 120kA / m, fine magnetic field strength 80kA / m) The TFe grade is above 57%, and the recovery rate is above 90%.

Embodiment 3

[0038] A certain carbonate-bearing iron ore in Donganshan was flotation-centred, the raw ore grade was 43%, and the siderite distribution rate was about 10-20%. The fluidized roasting-magnetic separation process was adopted. Under the condition that the particle size is -0.074mm accounting for 90%, after two stages of preheating, the first stage preheating temperature is 350°C, the second stage preheating temperature is 750°C, the roasting temperature is 570~600°C, and the CO flow rate is 4.5m3 / h , the CO concentration is 70~90%, the residence time is 1min, and the obtained roasted product is ground to about -0.038mm95%, and undergoes two stages of weak magnetic separation (rough selection magnetic field strength 120kA / m, fine selection magnetic field strength 80kA / m), obtained the sorting index of TFe grade above 65% and recovery rate above 80%. Taking this mine as an example, 450,000 tons of high-quality iron concentrate with a TFe grade of more than 65% can be obtained by ...

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Abstract

The invention discloses a fluidization roasting separation method of siderite-containing mixed iron ores. The fluidization roasting separation method comprises the following steps: carrying out multi-stage fluidization preheating on the siderite-containing mixed iron ores with the particle size of -0.5mm in an oxidizing atmosphere until the temperature of the mixed iron ores is 600-800 DEG C; roasting the preheated materials in a reducing atmosphere under the fluidized state condition, further carrying out fluidization cooling in air until reaching the room temperature, and carrying out ore grinding and magnetic separation, so as to obtain the siderite-containing mixed iron ores. The fluidization roasting separation method is applicable to the separation of multiple siderite-containing mixed ores, high in reaction speed and efficiency, low in energy consumption, good in separation effect and very suitable for being industrially popularized, and side products which are adverse to separation are few.

Description

technical field [0001] The invention relates to a separation technology of refractory iron ore, in particular to a magnetization roasting technology of siderite-containing mixed iron ore. Background technique [0002] my country has proven siderite resource reserves of 1.834 billion tons, and the reserves of siderite-containing mixed iron ore are huge, such as Jilin Linjiang Lingyang Iron Mine (about 1 billion tons), Jingtieshan Iron Mine (484 million tons), Qijiang Iron Mine (approximately 300 million tons), Xiaogushan Iron Mine in Anshan (over 1 billion tons) and oolitic hematite in Western Hubei (3.7 billion tons), etc. Due to the low theoretical iron grade of siderite (48.27%), mixed iron ore containing siderite not only reduces the grade of the concentrate, but also affects the smelting performance of the concentrate. When flotation operations are required, the presence of siderite Will deteriorate the flotation environment. At present, the siderite that has been utili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/10
Inventor 刘亚川张裕书韩跃新李艳军陈超张少翔
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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