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A kind of method for preparing stainless steel mother liquor with inconel ore pellets

A technology of iron ore balls and stainless steel, applied in fluidized bed furnaces and other directions, can solve the problems of high energy consumption and high reduction temperature, and achieve the effects of promoting oxidative consolidation, poor balling performance, and excellent balling performance

Active Publication Date: 2022-07-22
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pre-oxidation treatment can improve the reduction performance of chromite, but there are still disadvantages of high reduction temperature and high energy consumption

Method used

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  • A kind of method for preparing stainless steel mother liquor with inconel ore pellets
  • A kind of method for preparing stainless steel mother liquor with inconel ore pellets
  • A kind of method for preparing stainless steel mother liquor with inconel ore pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A method for strengthening chromite gas-based solid-state reduction is prepared according to the following steps:

[0040] (1) Pretreatment of chromite: the iron containing 22.61%, the Cr containing 2 O 3 42.55% of the chromite concentrate is wet ball milled 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 obtain pretreated chromite.

[0041] (2) Pretreatment of laterite nickel ore: drying the laterite nickel ore to a moisture content of less than 10% by weight, crushing the laterite nickel ore to less than 3mm with a roller crusher, and then grinding it with a rod mill to a particle size of more than 75% Less than 0.074mm, specific surface area not less than 1800cm 2 / g, to obtain pretreated laterite nickel ore.

[0042] (3) Ingredients: the particle size of magnetite less than 0.074mm accounts for more than 75wt%. The magnetite is mixed with the pretreated...

Embodiment 2

[0047] A kind of method for preparing stainless steel mother liquor containing inconel ore pellets, prepares according to the following steps:

[0048] (1) Pretreatment of chromite: the iron containing 22.61%, the Cr containing 2 O 3 42.55% of the chromite concentrate is wet ball milled 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 obtain pretreated chromite.

[0049] (2) Pretreatment of laterite nickel ore: drying the laterite nickel ore to a moisture content of less than 10% by weight, crushing the laterite nickel ore to less than 3mm with a roller crusher, and then grinding it with a rod mill to a particle size of more than 75% Less than 0.074mm, specific surface area not less than 1800cm 2 / g, to obtain pretreated laterite nickel ore.

[0050] (3) Ingredients: the particle size of magnetite less than 0.074mm accounts for more than 75wt%. The magnetite is mix...

Embodiment 3

[0057] A method for preparing a stainless steel mother liquor from ferronickel ore pellets of the present invention specifically comprises the following steps:

[0058] (1) Pretreatment of chromite: the iron containing 22.61%, the Cr containing 2 O 3 42.55% of the chromite concentrate is wet ball milled 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 obtain pretreated chromite.

[0059] (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 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 pretreated laterite nickel ore.

[0060] (3) Ingredients: mix the magnetite with the pretreated chromite and laterite nickel ...

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Abstract

The invention discloses a method for preparing stainless steel mother liquor from chromite-containing pellets, which is prepared according to the following method: 1) mixing pretreated chromite, laterite-nickel ore, magnetite and flux, and then forming pellets Obtaining green balls, and the flux is quicklime; 2) roasting the prepared green balls to obtain ferronickel oxidized pellets; 3) putting the obtained chromite oxidized pellets into a reduction furnace, Carry out gas-based solid-state reduction reaction at 800 ℃-1000 ℃ and reducing gas conditions to obtain pre-reduced pellets containing inconel; 4) mix the prepared pre-reduced pellets containing inconel with coke, put Into a high-temperature melting furnace for melting to obtain a chromium-nickel-containing iron alloy. The stainless steel mother liquor is smelted by the pelletized oxidative roasting-pre-reduction-melting process. The stainless steel mother liquor can be used as the raw material for smelting stainless steel to replace part of ferrochromium and nickel-iron alloys, so as to save energy consumption and reduce production costs in stainless steel production.

Description

technical field [0001] The invention relates to the technical field of stainless steel mother liquor, in particular to a method for preparing stainless steel mother liquor from chromite-containing pellets. Background technique [0002] Chromium and nickel are the most important and most used alloying elements of stainless steel. my country's traditional stainless steel smelting process mainly uses high-carbon ferrochromium and electrolytic nickel (or nickel-iron alloy) as raw materials containing chromium and nickel. The production of high-carbon ferrochromium and electrolytic nickel not only requires increasingly scarce and expensive chromite blocks. Ore and nickel sulfide ore are used as raw materials, and a lot of valuable electric energy is consumed, which leads to the high cost of stainless steel production. Therefore, it is imminent to develop a new process for the preparation of economical and energy-saving stainless steel smelting raw materials. [0003] my country'...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B1/16C22C33/04C21B13/00C22C38/40
CPCC22B1/2406C22B1/16C22C33/04C21C5/005C21B13/006C21B13/0046C22C38/40
Inventor 张峰朱德庆潘建
Owner GUIZHOU UNIV
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