Method for analyzing magnetic roasting effects of iron ore having different granularity ranges

A particle size range, magnetization roasting technology, applied in the field of metallurgy, can solve problems such as large volume capacity, loss, and many influencing factors, and achieve the effects of high experimental accuracy, improved resource utilization, and fewer external influencing factors.

Inactive Publication Date: 2013-12-25
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

However, there is currently no method for analyzing the difference in the magnetization roasting effect of iron ores with different particle sizes in the magnetization roasting of the rotary kiln. There is a certain difference in the chance of reduction reaction, and the fine-grained powder ore in the kiln is prone to ring formation and loss, so the existing magnetization roasti

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for analyzing the effect of iron ore magnetization roasting in different particle size ranges, comprising the following specific steps:

[0021] (1) Raw material preparation

[0022] The refractory iron ore produced by JISCO Jingtieshan Mine is selected as the raw material iron ore, and its properties are: TFe: 35.00%, FeO: 8.62%, SiO 2 : 22.34%; take 70kg of raw material iron ore of 0~15mm, use the quartering method to gradually divide and take 5kg of iron ore for later use, and then use the quartering method to gradually reduce and divide the above 5kg iron ore to take 1kg as Mineral sample for experiment; put the coal for reduction into a vibrating mill and grind it to less than 1mm to obtain a coal sample for reduction. The properties of the coal sample are moisture: 14.8%, ash: 23.12%, volatile matter: 31.21%, fixed carbon: 52.06 %;

[0023] (2) Drying: Dry the ore sample with a large multi-purpose drying box model DGT202, the drying temperature is 1...

Embodiment 2

[0037] The difference between embodiment 2 and embodiment 1 is:

[0038] In step (1), the raw iron ore of 65kg is sampled;

[0039] In step (2), the weight of the ore sample after drying is 0.953kg;

[0040] In step (3), the mass proportion of the coal sample in the mixture is 4%, the roasting temperature is 900°C, and the roasting time is 50 minutes;

[0041] In step (6), the mass of the dried roasted ore is 0.8537kg, and the burning loss rate is 10.42%;

[0042] In step (7), the weight percentages of the roasted ore in the four particle size ranges of 0~1mm, 1~3mm, 3~5mm and 5~15mm are respectively: 36.13%, 15.17%, 14.44%, 34.26%;

[0043] In step (9), the magnetic separation field strength is 1500Oe.

[0044] The experimental results are as follows:

[0045] The roasted ore grade of 0~1mm is 40.23%, the magnetic susceptibility is 1.73, the grade of iron concentrate is 55.43%, the yield is 52.74%, and the metal recovery rate is 72.67%;

[0046] The grade of 1~3mm roaste...

Embodiment 3

[0050] The difference between embodiment 3 and embodiment 1 is:

[0051] In step (1), 60kg of raw iron ore is taken for sampling;

[0052] In step (2), the weight of the ore sample after drying is 0.950kg;

[0053] In step (3), the mass proportion of the coal sample in the mixture is 5%, the roasting temperature is 800°C, and the roasting time is 65 minutes;

[0054] In step (6), the mass of the dried roasted ore is 0.8774kg, and the loss rate is 7.64%; The weight percentages of ore are: 35.22%, 14.79%, 16.02%, 33.97%;

[0055] In step (9), the magnetic separation field strength is 1000Oe.

[0056] The experimental results are as follows:

[0057] The roasted ore grade of 0~1mm is 38.49%, the magnetic susceptibility is 1.99, the grade of iron concentrate is 55.37%, the yield is 53.46%, and the metal recovery rate is 77.16%;

[0058] The grade of 1~3mm roasted ore is 40.59%, the magnetic susceptibility is 2.38, the grade of iron concentrate is 58.79%, the yield is 61.33%, ...

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Abstract

The invention provides a method for analyzing the magnetic roasting effects of an iron ore having different granularity ranges. The method mainly comprises the following technological steps: 1, preparing an experiment ore sample and a reduction coal sample; 2, drying the ore sample; 3, uniformly spreading the ore sample and the coal sample on a clean roasting porcelain dish, sending to a box type electric resistance furnace, and carrying out magnetic roasting to obtain a roasted ore; 4, rapidly taking out the roasted ore, and carrying out water quenching cooling; 5, filtering the roasted ore obtained after the water quenching cooling; 6, drying the filtered roasted ore sample; 7, screening the dried roasted ore by grid sieves to form roasted ores respectively having granularity ranges of 0-1mm, 1-3mm, 3-5mm and 5-15mm, and respectively weighing; 8, grinding the roasted ores respectively having granularity ranges of 0-1mm, 1-3mm, 3-5mm and 5-15mm to 1-60 meshes; and 9, carrying out magnetic separation of the roasted ores respectively having granularity ranges of 0-1mm, 1-3mm, 3-5mm and 5-15mm. The experiment method has the advantages of high accuracy and few extraneous influence factors, and provides a basis for the selection of roasting conditions during the sieve fraction magnetic roasting of difficult-separation iron ores.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a method for analyzing the magnetization roasting effect of iron ore in different particle size ranges. Background technique [0002] my country is rich in iron ore resources, but there are many lean ore resources and few rich ore resources. Lean ore accounts for about 94.6% of the total reserves. Most of them have the characteristics of low raw ore grade, complex mineral composition, and fine particle size, which leads to resource utilization. It is urgent to increase the development of low-grade refractory iron ore resources to reduce the waste of resources. [0003] At present, using magnetization roasting technology is the most effective method for processing refractory iron ore. Under the action of reducing agent, the original Fe in iron ore is reduced by high temperature 2 o 3 reduced to magnetic Fe 3 o 4 , and then carry out magnetic separation to obtain iron concentra...

Claims

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Application Information

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IPC IPC(8): C22B1/02B03C1/015
Inventor 王明华展仁礼谷怀雨张科陈永祺马胜军姜华权芳民
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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