Method for preparing chromium-nickel-containing iron ore oxidized pellets from chromite and laterite-nickel ore

A technology of laterite nickel ore and oxidized pellets, which is applied in the field of preparation of chromium-inconel-containing oxidized pellets, which can solve the problems of difficult separation of slag and iron, high energy consumption for smelting, poor quality of agglomerates, etc., and achieve excellent pelletizing performance , High crystal water content, poor ball forming effect

Pending Publication Date: 2021-10-29
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Both chromite and lateritic nickel ore are refractory and refractory minerals, both of which have problems such as poor agglomeration quality, high energy consumption for smelting, and difficulty in separating slag and iron.

Method used

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  • Method for preparing chromium-nickel-containing iron ore oxidized pellets from chromite and laterite-nickel ore
  • Method for preparing chromium-nickel-containing iron ore oxidized pellets from chromite and laterite-nickel ore
  • Method for preparing chromium-nickel-containing iron ore oxidized pellets from chromite and laterite-nickel ore

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A method for strengthening chromite gas-based solid-state reduction, prepared according to the following steps:

[0027] (1) Chromite pretreatment: 22.61% iron and Cr 2 o 3 42.55% of the chromite concentrate is subjected to wet ball milling until more than 90% of the particles in the chromite have a particle size of less than 0.074mm and a specific surface area of ​​not less than 1500cm 2 / g to get pretreated chromite.

[0028] (2) Pretreatment of laterite nickel ore: dry the laterite nickel ore to a moisture content below 10% (weight), crush the laterite nickel ore to less than 3mm with a roller crusher, and then grind it to a particle size of more than 75% with a rod mill Less than 0.074mm, specific surface area not less than 1800cm 2 / g to obtain the pretreated laterite nickel ore.

[0029] (3) Batching: the particle size of magnetite less than 0.074mm accounts for more than 75wt%. The magnetite is mixed with the pretreated chromite and laterite nickel ore, and ...

Embodiment 2

[0033] A kind of preparation method of Inconel-containing oxidized pellet of the present invention, comprises the following steps:

[0034] (1) Chromite pretreatment: 22.61% iron and Cr 2 o 3 42.55% of the chromite concentrate is subjected to wet ball milling until more than 90% of the particles in the chromite have a particle size of less than 0.074mm and a specific surface area of ​​not less than 1500cm 2 / g to get pretreated chromite.

[0035] (2) Pretreatment of laterite nickel ore: dry the laterite nickel ore to a moisture content below 10% (weight), crush the laterite nickel ore to less than 3mm with a roller crusher, and then grind it to a particle size of more than 75% with a rod mill Less than 0.074mm, specific surface area not less than 1800cm 2 / g to obtain the pretreated laterite nickel ore.

[0036] (3) Batching: the particle size of magnetite less than 0.074mm accounts for more than 75wt%. Magnetite is mixed with pretreated chromite and lateritic nickel ore,...

Embodiment 3

[0040]A kind of preparation method of Inconel-containing oxidized pellet of the present invention, comprises the following steps:

[0041] (1) Chromite pretreatment: 22.61% iron and Cr 2 o 3 42.55% of the chromite concentrate is subjected to wet ball milling until more than 90% of the particles in the chromite have a particle size of less than 0.074mm and a specific surface area of ​​not less than 1500cm 2 / g to get pretreated chromite.

[0042] (2) Pretreatment of laterite nickel ore: dry the laterite nickel ore to a moisture content of less than 10%, crush the laterite nickel ore to less than 3mm with a double-roller crusher, and then use a rod mill to grind the laterite nickel ore to a particle size of more than 75% and less than 0.074mm , the specific surface area is not less than 1800cm 2 / g to obtain the pretreated laterite nickel ore.

[0043] (3) Ingredients: mix magnetite with pretreated chromite and laterite nickel ore, and the ore blending ratio is chromite: lat...

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Abstract

The invention discloses a method for preparing chromium-nickel-containing iron ore oxidized pellets from chromite and laterite-nickel ore. The method comprises the following steps that (1) the pretreated chromite, the laterite-nickel ore, magnetite and a flux are mixed, then pelletizing is performed to obtain green pellets, and the flux is quicklime; and (2) the prepared green pellets are roasted, and the chromium-nickel-containing iron ore oxidized pellets are obtained. A new way is provided for efficient and comprehensive utilization of the chromite and the laterite-nickel ore. The pellets can be used as raw materials for smelting chromium-nickel-containing stainless steel mother liquor in a smelting reduction furnace, an electric furnace, a blast furnace and the like, the produced stainless steel mother liquor can replace part of ferrochrome and ferronickel, and the high-quality furnace charge is provided for smelting stainless steel.

Description

technical field [0001] The invention relates to the technical field of preparation of Inconelite-containing oxidized pellets, in particular to a method for preparing Inconelite-containing oxidized pellets by using chromite and laterite nickel ore. Background technique [0002] Chromium and nickel are the most important and most used alloying elements in stainless steel. In my country's traditional stainless steel smelting process, high-carbon ferrochrome and electrolytic nickel (or nickel-iron alloy) are mainly used as chromium-containing and nickel-containing raw materials. The production of high-carbon ferrochrome and electrolytic nickel not only requires increasingly scarce and expensive chromite nuggets Mineral ore and nickel sulfide ore are used as raw materials, and a large amount of precious electric energy is consumed, which leads to high production costs of stainless steel. Therefore, it is imminent to develop a new process for the preparation of economical and ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/02
CPCC22B1/2406C22B1/02
Inventor 张峰朱德庆潘建
Owner GUIZHOU UNIV
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