Method for producing sponge iron by smelting refractory iron ore (slag) with reduction rotary kiln

A technology of rotary kiln and sponge iron, applied in the direction of fluidized bed furnace, etc., can solve the problems of unavailability, inability to exploit, and difficulty of beneficiation of non-ferrous metals of iron element, so as to be beneficial to large-scale industrial production, good social benefits, The effect of strong market competitiveness

Inactive Publication Date: 2011-12-07
李维成 +2
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Problems solved by technology

[0002] There are many non-magnetic refractory hematite, limonite, goethite, siderite, and weak magnetite mineral resources of different grades in my country. Due to the difficulty of ore dressing, they have not been able to be mined and utilized; i

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Example Embodiment

[0020] A. Raw material preparation

[0021] Crush all kinds of iron ore (slag) with iron content of 18~70% and sulfur content of 0.01~1.5% as main material, particle size ≤20mm, sulfur content ≤0.25~0.5%, phosphorus ≤0.03%, calorific value ≥5800 ~7500 kcal / kg, coking index ≤ 3 (no coking), coal with volatile content ≥ 32% is used as reduced coal and fuel sprayed to pulverize the coal, particle size ≤ 15mm. The lime with sulfur content ≤0.01~0.03% and phosphorus≤0.01~0.03% is used as desulfurizer, and the lime particle size is ≤0~2mm.

[0022] The weight ratio of the three components of iron ore (slag) reduced coal and lime is 20 to 80 parts of iron ore (slag), 4 to 25 parts of reduced coal, and 0.1 to 2 parts of lime.

[0023] In this embodiment, 80 parts of iron ore (slag) are taken; 12 parts of reduced coal and 1.2 parts of lime are taken.

[0024] B. Rotary kiln reduction

[0025] According to the weight ratio of the components, various iron ore (slag), reduced coal and lime are mi...

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Abstract

The invention provides a method that various refractory iron ores (slag), reduction coal and lime are placed in a rotary kiln for reduction, so as to prepare industrial spongy iron (TFe>=70-93%, metallization rate>=90-95%) and a baking-free brick raw material, and recover nonferrous metals. A process flow comprises steps of raw material preparation, reduction in the rotary kiln, cooling in a cooling kiln, concentration processing, and briquetting and balling. A granularity of the ore (slag) is no more than 20mm; a coal granularity is less than 15mm; and a lime granularity is no more than 0-2mm. A primary air and a secondary air are employed to combust the coal. A reduction roasting time is 3-10h; a combustion temperature in the kiln is controlled at 1000-1200 DEG C; and water and wind are used for cooling in the cooling kiln. The materials are cooled to a normal temperature under 40 DEG C, and treated with the concentration processing, briquetting and balling, so as to prepare the industrial spongy iron and recover the nonferrous metals. The method of the invention has advantages of simpleness, energy saving, emission reduction, waste reutilization, low production costs, good product quality, green and environmental protection, large market and strong competitiveness; besides the method has good economic benefits as well as good social benefits, and solves a domestic technical problem of refractory iron ore and an environmental protection problem of changing waste into valuables.

Description

technical field [0001] The invention relates to a method for preparing industrial sponge iron by directly processing refractory hematite, limonite, goethite, siderite, weak magnetite and iron-containing waste slag by using a reduction rotary kiln. Background technique [0002] There are many non-magnetic refractory hematite, limonite, goethite, siderite, and weak magnetite mineral resources of different grades in my country. Due to the difficulty of ore dressing, they have not been able to be mined and utilized; in addition, there are some iron-containing mineral resources. Smelting and chemical waste slag pile up into mountains, and the iron element and some non-ferrous metals in it cannot be used, which seriously pollutes the environment and wastes resources. Contents of the invention [0003] The object of the present invention is to overcome the above disadvantages, to provide a reduction rotary kiln with high degree of mechanization, low reduction temperature, capable ...

Claims

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Application Information

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IPC IPC(8): C21B13/00
Inventor 李维成王金槐李睿昌晶
Owner 李维成
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