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Energy-saving and environment-friendly ferro-nickel alloy production method

A technology of nickel-iron alloy and production method, which is applied in the field of energy-saving and environment-friendly nickel-iron alloy production, can solve problems such as high energy consumption and ineffective utilization of gas, achieve low energy consumption, fully utilize sensible heat and latent heat of flue gas, and increase output Effect

Active Publication Date: 2019-10-18
广西冶金研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the coal gas produced by the smelting of the submerged electric furnace has not been effectively utilized, and the problem of the hot state feeding has not been well solved with the cold state feeding of the submerged electric furnace. Therefore, the energy consumption is high

Method used

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  • Energy-saving and environment-friendly ferro-nickel alloy production method

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Embodiment 1

[0028] Such as figure 1 , figure 2 Shown, a kind of energy-saving and environment-friendly nickel-iron alloy production method of the present invention comprises the following steps:

[0029] 1. Mixing and granulation: the mixture of stainless steel sludge, stainless steel acid slag, stainless steel scale, stainless steel grinding wheel ash, dust and coal powder is initially mixed and homogenized at a ratio of 1:0.16, and transported to the top with a grab bucket The silo is then transported to the twin-shaft mixer 1 by a belt for stirring and mixing. After mixing, it enters the drum granulator 2, and the drum granulator 2 controls the spraying of granulation water for uniform granulation.

[0030] 2. Rotary kiln drying and sintering: the granulated material is transported to the lower silo at the kiln end of the rotary kiln 3 by belt, and enters the rotary kiln 3 from the lower silo, and the granules are moved to the direction of the kiln head by the horizontal inclination...

Embodiment 2

[0034]1. Mixing and granulation: the mixture of stainless steel sludge, stainless steel acid slag, stainless steel oxide skin, stainless steel grinding wheel ash, dust and coal powder is initially mixed and homogenized at a ratio of 1:0.11, and then transported to the top with a grab bucket The silo is then transported to the twin-shaft mixer 1 by a belt for stirring and mixing. After mixing, it enters the drum granulator 2, and the drum granulator 2 controls the spraying of granulation water for uniform granulation.

[0035] 2. Rotary kiln drying and sintering: the granulated material is transported to the lower silo at the kiln end of the rotary kiln 3 by belt, and enters the rotary kiln 3 from the lower silo, and the granules are moved to the direction of the kiln head by the horizontal inclination and rotation of the rotary kiln 3 Movement, reverse contact with high-temperature flue gas, the temperature of the pellets continues to rise, so that free water and crystal water ...

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Abstract

The invention provides an energy-saving and environment-friendly ferro-nickel alloy production method, and belongs to the field of thermometallurgy. The production method is characterized in that mixtures of stainless steel sludge, stainless steel acid residue, stainless steel scale, stainless steel grinding wheel dust and return dust, and pulverized coal are mixed according to a certain proportion uniformly; then, through the procedures of granulation, drying and sintering in a rotary kiln, conveying of sintered materials through a sealed shaftless screw conveyor and smelting of a fully enclosed ore-smelting electric furnace, the ferro-nickel alloy and slag are obtained; and the ferro-nickel alloy is used as raw materials of stainless steel, and the slag is used as building materials after water quenching; and smelter off-gas is discharged through a chimney after reaching the standard through cyclone dust collection, bag dust collection, alkali cleaning and demisting of an electrostatic mist eliminator. The required fuel for drying and sintering in the rotary kiln is hot coal gas generated by smelting of the ore-smelting electric furnace, and the sintered materials of the rotary kiln enter the fully enclosed ore-smelting electric furnace in the thermal state. The energy utilization of a smelting method is sufficient, and the flue gas is discharged after reaching the standard;the fixed investment is less, and the occupied area is small; the production run cost is low; and the social, economic and environmental benefits are obvious.

Description

technical field [0001] The invention belongs to the field of pyrometallurgy, and in particular relates to an energy-saving and environment-friendly nickel-iron alloy production method. Background technique [0002] With the development of social economy and the improvement of people's living standards, the consumption of stainless steel has increased greatly, and the stainless steel production and processing industry has achieved rapid development. In 2018, the output of crude stainless steel in my country reached 26.7068 million tons, of which 12.8207 million tons were 300 series (Cr-Ni steel). In the stainless steel processing industry, the stainless steel sludge and stainless steel acid slag produced are about 3% to 5% of the stainless steel production. The sludge contains Ni, Cr, Fe and other valuable metal elements. The content of Ni and Cr is the laterite nickel ore. about 2 times that of CaF 2 , CaO, SiO 2 , CaSO 4 and other substances are hazardous waste. In add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C19/03C22B7/00C22B23/02
CPCC22B7/001C22B23/023C22C1/023C22C19/03Y02P10/20
Inventor 何耀柳丽梅黄厚健罗增泉詹永光
Owner 广西冶金研究院有限公司