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Limonite beneficiating process

A beneficiation method and limonite technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of low recovery rate, low iron grade, high iron grade, etc., achieve process simplification, improve quality, and increase iron grade Effect

Inactive Publication Date: 2007-08-22
GUANGDONG PROVINCE DABAOSHAN MINING CO LTD
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Problems solved by technology

The disadvantages of this method are: the iron grade after treatment is low, generally around 49%; increased
The usual beneficiation methods cannot achieve the purpose of increasing iron grade and reducing arsenic and sulfur impurities.
[0004] Chinese patent application 200610031735.6, titled "A method for beneficiation of weakly magnetic iron ore such as siderite, limonite and siderite paragenetic ore" discloses a process flow including roasting stage, magnetic separation stage and reverse flotation stage , the disadvantage of this application is that the process is complicated, the control is difficult, and the cost of beneficiation is high

Method used

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Embodiment Construction

[0013] Below in conjunction with embodiment the present invention is further described.

[0014] This specific embodiment uses the fine ore of low iron grade, high sulfur and arsenic limonite from Guangdong Dabaoshan Mining Co., Ltd. as raw material. The particle size of the fine ore is less than 10mm, and the moisture content is less than 15%. The weight percentage content of general grades reaches: Fe: 45-50%, As: 0.1-0.3%, S: 0.5-2%, Al 2 o 3 : 2.5-4.0%, SiO 2 : 8-15%.

[0015] The above materials are mixed with pulverized coal with a particle size of less than 10% and a ratio of 0-8%, and then enter the same rotary kiln for drying and roasting: the temperature in the drying zone is controlled at 350±80°C, and the temperature in the roasting zone is controlled at 800±150°C ;The speed of the rotary kiln is controlled at 0.8-1.5r / min; the flue gas produced by roasting is purified and then emptied; the roasted ore is cooled with water (also known as quenching water); Sorti...

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Abstract

The limonite beneficiating process include the following steps: 1. mixing limonite powder of granularity smaller than 10 mm and water content less than 15 % with coal powder in 0-8 wt%; stoving, magnetizing, dearsenizing and desulfating in a rotary kiln with rotation speed of 0.8-1.5 rpm, baking area temperature of 800+ / -150 deg.c and stoving area temperature 350+ / -80 deg.c; and 2. water cooling the baked limonite, grading in a grading machine, sorting with magnetic pulley, and magnetic separating to obtain iron ore concentrate as the ultimate product. The present invention may be used widely in beneficiating ore containing weak magnetic iron mineral and dregs.

Description

【Technical field】 [0001] The invention relates to a limonite beneficiation method in mineral processing, in particular to a chemical beneficiation method for producing iron concentrate with high iron grade and low arsenic and sulfur impurities from limonite powder ore with low iron grade and high arsenic and sulfur impurities . 【Background technique】 [0002] Limonite is an iron-making raw material. At present, the recycling of limonite powder ore with low iron grade and high arsenic and sulfur impurities usually adopts physical beneficiation methods such as gravity separation, flotation, and strong magnetic separation, and the product is limonite fine powder. The disadvantages of this method are: the iron grade after treatment is low, generally around 49%; increased. [0003] Guangdong Dabaoshan Mining Co., Ltd. is the largest limonite mine in my country. At present, the ore processing plant of this ore processes 1.2 million tons of raw ore and 650,000 tons of finished i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/015B03C1/00
Inventor 邹卫清刘聪刘丁强
Owner GUANGDONG PROVINCE DABAOSHAN MINING CO LTD
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