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Method for producing iron ore concentrate by quickly burning siderite through microwave

A technology of siderite and iron concentrate, which is applied in the field of microwave rapid calcination of siderite to produce iron concentrate, can solve the problems of large amount of flue gas, high cost, and easy sintering, and achieve high iron ore grade, improved grade, The effect of little pollution

Inactive Publication Date: 2012-07-25
KUNMING UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of easy sintering, high calcination temperature, high energy consumption, high cost and large amount of flue gas in the existing conventional heating process, the present invention proposes a method for rapid microwave calcination of siderite to remove its carbonate and improve iron grade. art method

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] Place 10Kg of siderite powder with iron content of 40% and moisture content of 0.2% in a microwave reactor, and feed in oxygen according to the mass ratio of oxygen and siderite as 1:18, with a frequency of 2450MHz and an input power of After heating up to 660°C with 3000W, keep it warm for 10 minutes, and stir the siderite powder during the microwave heating and heat preservation process, that is to say, the siderite powder with high grade and the main component is Fe 3 o 4 iron concentrate (56% iron grade).

Embodiment 2

[0020] Place 15Kg of siderite powder with iron content of 40% and moisture content of 0.2% in a microwave reactor, and feed oxygen into the microwave reactor according to the mass ratio of oxygen and siderite as 1:22, with a frequency of 2450MHz and an input power of After heating up to 500°C with 4000W, keep it warm for 30 minutes, and stir the siderite powder during the microwave heating and heat preservation process, that is to say, the siderite powder with high grade and the main component is Fe 3 o 4 iron concentrate (58% iron grade).

Embodiment 3

[0022] Put 100Kg of siderite powder with an iron content of 41% and a moisture content of 0.2% in a microwave reactor, add 7Kg of limonite, and pass in oxygen according to the mass ratio of oxygen and siderite as 1:20, with a frequency The temperature is 2450MHz, and the input power is 14KW. After heating up to 600°C, keep it warm for 60 minutes, and stir the siderite powder during the microwave heating and heat preservation process, that is to say, the siderite powder with high grade and main component is Fe 3 o 4 iron concentrate (58% iron grade).

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Abstract

The invention provides a method for producing iron ore concentrate by quickly burning siderite through microwave, comprising the steps of placing the siderite powders into a microwave reactor and introducing oxygen to heat the siderite to 400-700 DEG C at a frequency of 2450 MHz and an input power of 50-300 W / Kg; and then keeping the temperature for 10-20 minutes to obtain high-grade iron ore concentrate with Fe3O4 being the principal component. The method has the characteristics of cleaning, energy saving, low cost, and small pollution. The iron ore obtained after calcination is of high grade and the high-temperature smog can be further applied to drying the iron ore concentrate after dust extraction.

Description

technical field [0001] The invention relates to a process method for obtaining iron concentrate by calcining siderite, in particular to a method for producing iron concentrate by rapidly calcining siderite with microwaves, and belongs to the technical field of iron concentrate production. Background technique [0002] Siderite (including single siderite, hematite, limonite, siderite and other symbiosis) resources are very rich. The world's proven reserves are about 1.8 billion tons, accounting for 14% of the world's total iron. It is predicted that siderite accounts for more than 40% of the potential resources of iron ore in the world. Due to the low grade of natural siderite (theoretical iron grade is only 48.3%), the actual iron content of rich siderite is 30-40%, and it is easy to produce muddy phenomenon during the grinding process. Mineral symbiosis often contains high sulfur, and it is very difficult to directly beneficiate ore. [0003] At present, siderite and asso...

Claims

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Application Information

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IPC IPC(8): C22B1/02
Inventor 巨少华王欣彭金辉张利波朱红波郭胜惠徐磊
Owner KUNMING UNIV OF SCI & TECH
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