Preparation method for producing strong-magnetism magnetite through refractory weak-magnetism oxidized iron ore

A technology of iron oxide ore and weak magnetism, which is applied in the field of preparation of strong magnetic magnetite from refractory weakly magnetic iron oxide ore, which can solve problems such as low concentrate grade and recovery rate, large-scale equipment, and large investment , to achieve the effect of increasing the reaction speed and roasting efficiency, improving the recovery rate and improving the heat transfer efficiency

Active Publication Date: 2016-02-10
湖北华方装备有限公司
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high energy consumption, large-scale equipment, large investment, low concentrate grade and recovery rate in the existing magnetite concentrate production method, and to provide a production method using refractory weak magnetic iron oxide ore to produce strong Preparation method of magnetic magnetite

Method used

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  • Preparation method for producing strong-magnetism magnetite through refractory weak-magnetism oxidized iron ore

Examples

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example 1

[0024] Example 1: see figure 1 The process of applying the present invention to prepare high-grade magnetite concentrate from rhombohedral and limonite comprises the following steps: (1) Milling and processing: sending rhombohedral and limonite with a particle size of 25-80mm through a belt conveyor 1 To the ore bin 3, the ore is fed from the ore bin 3 and enters the high-efficiency vertical roller mill 5 for grinding through the quantitative feeding device 4. It is equipped with a low-temperature flue gas fluidized furnace 27 (and a coal feeding system 28) Generate 300-500°C low-temperature hot air and mix with the return air of the subsequent roasting system to 300°C and enter the high-efficiency vertical roller mill 5 while drying and grinding, and the fine-grained ore powder after being dried and ground is under the action of hot gas Enter the high-efficiency powder separator 6 for powder separation, select powder ore with a particle size of ≤0.2mm and a water content of l...

example 2

[0035] Example 2: The steps of the basic process production method are the same as Example 1, but the following adjustments are made, (1) The low-temperature roasting time is 10s; (2) The temperature of the low-temperature reducing gas prepared by the tempering furnace is 650°C, and the volume fraction of CO is controlled at 3%; (3) A four-stage cyclone preheater is used; (4) The solid-to-gas ratio of the ore powder and the low-temperature reducing gas introduced during low-temperature roasting in step (2) is 1.5kg / Nm 3 ; (5) The roasting chamber of the jetting roaster is equipped with 3 special-shaped necks.

[0036] The grade of magnetite concentrate produced from refractory water chestnut and limonite by adopting the process method of Example 2 reaches 62%, and the recovery rate reaches 87%.

example 3

[0037] Example 3: The steps of the basic process production method are the same as in Example 1, but the following adjustments are made, (1) The low-temperature roasting time is 60s; (2) The temperature of the high-temperature reducing gas prepared in the tempering furnace is 700°C, and the volume fraction of CO is controlled at 5%; (3) A six-stage cyclone preheater is used; (4) The solid-to-gas ratio of the ore powder and the low-temperature reducing gas introduced during low-temperature roasting in step (2) is 1.8kg / Nm 3 ; (5) The roasting chamber of the jetting roaster is equipped with 4 special-shaped shrinks.

[0038] The grade of magnetite concentrate produced from refractory water chestnut and limonite by adopting the process method of Example 3 reaches 62.5%, and the recovery rate reaches 88%.

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Abstract

The invention relates to the production techniques of iron ore concentrate of refractory ore, in particular to a preparation method for producing strong-magnetism magnetite through refractory weak-magnetism oxidized iron ore. The method comprises the following steps that firstly, the crushed iron ore is ground into fine ore; then the fine ore is subjected to low-temperature roasting, and during the low-temperature roasting, the fine ore is made to be in a roasting system to be preheated and roasted; the roasted ore enters a cooling system to be cooled; and then the cooled roasted ore is subjected to size mixing and sent to a magnetic separation system to be separated, and high-grade iron ore concentrate is obtained through separation. According to the method, the process is simple, the temperature and air flow are distributed uniformly, control is easy, the automation degree is high, the number of operation components of equipment is small, refractory siderite and limonite can be treated, the magnetizing roast efficiency of the refractory iron ore is high, heat is substantially recycled during roasting, the roasted ore is stable in quality and high in magnetic separation efficiency, and the technical indexes that the grade of the iron ore concentrate is larger than 60%, and the iron recycling rate is larger than 85% can be achieved.

Description

technical field [0001] The invention relates to the iron concentrate production technology of refractory ore, in particular to a preparation method for producing strong magnetic magnetite from refractory weakly magnetic iron oxide ore. Background technique [0002] The magnetization roasting technology currently applied in industrial production mainly includes shaft furnace roasting and rotary kiln roasting. Blast furnace gas is used as fuel to produce siderite and hematite magnetized roasting, but they have been discontinued now; the useful minerals in Jingtieshan iron ore in the concentrator of Jiuquan Iron and Steel Corporation are specularite, limonite and magnesium Siderite, due to the complexity of minerals and gangues, is currently produced by magnetization roasting in a shaft furnace. The roasted ore is subjected to weak magnetic separation to obtain iron concentrates with a grade of 55%-56%, and the recovery rate is 70-80%. Rotary kiln roasting is used to process 0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02
CPCC22B1/02
Inventor 洪志刚
Owner 湖北华方装备有限公司
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