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Method for smelting artificial chromium-rich mine

A smelting method and chromium-rich ore technology, applied in the field of mining and metallurgy, to achieve the effect of good ratio between elements, wide range of options, and less impurities

Inactive Publication Date: 2009-09-09
韩江霖
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Problems solved by technology

[0004] In the existing method of smelting ferrochromium, submerged arc furnace or electric furnace is usually used for smelting, but no matter which method requires ore, it must be low-iron and high-chromium lump ore, that is, Cr 2 o 3 Content > 40%, Fe content 2 o 3 / FeO>2.5, but few ores in nature can meet this condition

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the examples. It should be understood that these examples are only for the purpose of illustration, and in no way limit the protection scope of the present invention.

[0016] The artificial chrome-rich ore smelting method of the present invention comprises processes such as feeding, air supply, and smelting. The raw material is low-chrome ore (diameter 0.5-3mm) produced in Indonesia, and its main component content is as shown in Table 1.

[0017] Table 1

[0018] Indonesian powder ingredients

Cr 2 o 3

Fe

SiO 2

al 2 o 3

P

S

MgO

CaO

C

Content (weight%)

26.33

49

3.65

7.11

0.012

0.005

6.37

1.43

0.048

[0019] The coke is first-grade coke with a particle size of 20-45mm, ash content of 11.5%, volatilization of 1.5%, and sulfur of 0.55%. Coke powder requires fixed carbon cont...

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Abstract

The invention provides a method for smelting artificial chromium-rich mine, comprising working procedures such as charging, air supplying, smelting, etc. Counting as proportion by weight, raw material comprises low-chromium mine which is taken as 100%. The method comprises following steps: limestone with 40-50% of CaCo3 content and coke powder with more than 80% of fixed carbon content are added and sintered, and sintered ball and coke reacts with each other in a blast furnace for 1.5-2 hours under the temperature 1250-1350 DEG C so as to obtain artificial chromium-rich mine with more than 60% of Cr2O3 and low-chromium ferroalloy with less than 3% of metal Cr.

Description

technical field [0001] The invention relates to a method for smelting chromium-rich ore, in particular to a method for smelting artificial chromium-rich ore by using a blast furnace, and belongs to the field of mining and metallurgy. Background technique [0002] In the metallurgical industry, chromite is mainly used to produce ferrochrome alloy and metallic chromium. At present, chromite is a shortage of minerals in my country, with small reserves and low output, and more than 90% of annual consumption depends on imports. However, the mechanical beneficiation method cannot separate and enrich the iron and chromium in the low-chromium ore, so that this kind of ore is neither easy to smelt nor can be used as a raw material for ferrochrome alloy. It has been regarded as garbage ore and discarded, resulting in waste of resources and serious damage Environmental issues. For this reason, it is of great economic significance to develop and utilize these lean ores. [0003] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/02C22B1/16
Inventor 韩江霖
Owner 韩江霖
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