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Method for producing oxidized pellets from gold ore tailings and limonite

A technology of gold ore tailings and oxidized pellets, which is applied in the field of pellet preparation, can solve the problems of low bursting temperature of raw pellets, difficulty in making pellets, and high crystal water, and achieve the goal of increasing bursting temperature and strength Effect

Active Publication Date: 2011-12-28
山东瑞拓球团工程技术有限公司
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Problems solved by technology

[0004] With the continuous mining of earth resources and the shortage of rich ore, it is necessary to continuously expand the utilization of lean ore resources. Our country is rich in limonite resources, but its iron grade is low, its physical water content and crystal water are high, and its burning loss is large. Narrow, low burst temperature of raw pellets, difficult to be directly used for ironmaking, and difficult to make pellets
Chinese patent document CN1022766C discloses a "process and equipment for producing limonite pellets by shaft furnace method". Due to the use of shaft furnace method for production and the need to add bentonite and gas ash, the quality of the pellets is not high

Method used

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Embodiment Construction

[0020] The raw material that the oxidation pellet that the present invention produces adopts is gold ore tailings, limonite and magnetite, and the main chemical composition in each raw material is as shown in the following table:

[0021] type TF FeO SiO 2 CaO Al 2 o 3 MgO TiO 2 S P Na 2 o K 2 o Gold mine tailings 35.80 14.77 2.03 8.11 2.13 0.17 0.056 0.057 0.42 0.52 magnetite 56.14 9.56 6.65 0.89 3.94 0.97 0.12 0.032 0.034 0.22 0.24 Limonite 54.89 1.14 4.56 0.37 0.68 0.41 0.007 0.009

[0022] The iron minerals in gold mine slag are mainly goethite and hematite, and contain more clay-like gangue minerals (such as kaolinite, illite, low melting point mineral potassium feldspar, etc.). The iron minerals in magnetite are mainly Fe3O4, and the gangue minerals are similar to gold mine slag.

[0023] Through experiments, the present invention conducts qualitative and quantitative analysis...

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Abstract

The invention provides a method for producing oxidized pellets by using gold ore tailing and limonite. The method comprises the following steps of: mixing 40 percent by weight of powder of the gold ore tailing, 30 percent by weight of powder of the limonite and 30 percent by weight of powder of magnetite respectively to prepare green pellets; preheating in a chain grate; feeding in a rotary kiln to fire and shape; and finally, cooling through a circular cooler to prepare oxidized pellets, wherein the iron content of the pellet finished product reaches 53 percent. In the method, by rationally proportioning the gold ore tailing, the limonite and the magnetite and rationally setting process parameters, and prolonging the time of the green pellets at a low-temperature section of 200-400 DEG Cof the chain grate, the strength of the green pellets is improved, the cracking temperature of the green pellets during preheating is also increased by 45-50 DEG C, qualified green pellets are obtained, and the green pellets are finally fired through the rotary kiln to prepare the final oxidized pellets.

Description

technical field [0001] The invention relates to a preparation method for pellets, belonging to the technical field of pellet preparation. Background technique [0002] Pellets are smelting raw materials in the iron and steel industry. The manufacturing process is to mix iron concentrate powder or other iron-containing powders with a small amount of additives, and then roll them into balls through a pelletizer under the condition of adding water and moistening them, and then dry and roast them. , consolidated into a spherical iron-containing raw material with certain strength and metallurgical properties. The equipment used are respectively a pelletizer for making green pellets, a chain grate for preheating green pellets and a rotary kiln for roasting green pellets after preheating. The physical and chemical properties of the pellets in the production process have a key impact on the determination of the pellet production process, especially the selection of the thermal para...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/14
Inventor 张允茂
Owner 山东瑞拓球团工程技术有限公司
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