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Stainless steel acid pickling sludge treatment process

A technology for pickling sludge and treatment process, applied in the furnace type, solid separation, furnace and other directions, can solve the problem of low melting temperature of pickling sludge, unfavorable direct reduction of pickling sludge, and inability to produce metallization rate reduction materials, etc. problems, to achieve the effect of shortening the reduction time, efficient utilization, and reducing the reduction temperature

Active Publication Date: 2018-05-18
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the pickling sludge is directly reduced by a rotary kiln alone, because the CaF in the pickling sludge 2 The content is high, and the melting temperature of pickling sludge is low, which is not conducive to the direct reduction of pickling sludge, and it is impossible to produce reduced materials with high metallization rate

Method used

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  • Stainless steel acid pickling sludge treatment process

Examples

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Effect test

Embodiment 1

[0042] A stainless steel pickling sludge treatment process, the specific process is as follows:

[0043] 1. Selection of materials

[0044] Stainless steel pickling sludge: iron grade 12%, SiO 2 Mass content 7%, Cr 2 o 3 The mass content is 3%, and the Ni mass content is 1%.

[0045] Stainless steel oxide scale: iron grade is 50%, Cr 2 o 3 The mass content is 15%, and the Ni mass content is 1%.

[0046] High volatile granular coal: 44% fixed carbon mass content, 9% ash mass content, 49% volatile matter mass content, and 20mm particle size.

[0047] High-grade hematite: Fe grade is 47%, particle size is 1mm.

[0048] 2. Material granulation

[0049] Stainless steel pickling sludge, iron oxide scale and reduced coal are batched and mixed according to the mass ratio of 50:50:20 to obtain mixed raw materials. The mixed raw materials are made into granular materials with a water content of 10% and a particle size of 5mm by a disc granulator. The reduced coal is ground to 2...

Embodiment 2

[0060] A stainless steel pickling sludge treatment process, the specific process is as follows:

[0061] 1. Selection of materials

[0062] Stainless steel pickling sludge: iron grade 16%, SiO 2 Mass content 5%, Cr 2 o 3 The mass content is 4%, and the Ni mass content is 2%.

[0063] Stainless steel oxide scale: iron grade is 56%, Cr 2 o 3 The mass content is 28%, and the Ni mass content is 9%.

[0064] High volatile granular coal: 46% fixed carbon mass content, 7% ash mass content, 47% volatile matter mass content, and 5mm particle size.

[0065] High-grade hematite: the iron grade is 48%, and the particle size is 10mm.

[0066] 2. Material granulation

[0067] Stainless steel pickling sludge, iron oxide scale and reduced coal are batched and mixed according to the mass ratio of 50:50:10 to obtain mixed raw materials. The mixed raw materials are made into granular materials with a water content of 12% and a particle size of 3mm by a cylinder granulator. The reduced c...

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Abstract

The invention relates to stainless steel acid pickling sludge treatment process. The stainless steel acid pickling sludge treatment process includes the steps that (1) after stainless steel acid pickling sludge, iron oxide scale and reduction coal are prepared and mixed according to the mass ratio of 50:50:(10-20), granular materials with water content of 10-12% and particle size of 3-5mm are produced by a granulating machine; (2) after the granular materials are dried and pre-heated in a rotary kiln, the granular materials are sent to a high temperature reducing zone to be reduced under the temperature of 1150-1250 DEG C for 90-120min, and high-volatility pea coal and high grade pea ore are sprayed into the rotary kiln to be subjected to combined hydrocarbon reduction and carbon cycle oxygenation reduction; and (3) after taken out of the kiln, the high temperature roasting materials are cooled and magnetically separated, granular metallization products used by a power supply furnace or a converter can be obtained. According to the stainless steel acid pickling sludge treatment process, while the stainless acid pickling sludge and the iron oxide scale of steel enterprises are treated, iron, nickel and chrome resources of materials can be effectively used, and high quality metallization materials with the nickel and the chrome are produced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and mineral engineering, and relates to a low-temperature hydrocarbon combined reduction composite treatment process for stainless steel pickling sludge in a rotary kiln. Background technique [0002] With the depletion of mineral resources and the continuous improvement of environmental protection requirements, iron and steel enterprises are facing severe challenges in energy conservation and emission reduction. The amount of sludge produced by stainless steel pickling is about 2-3% of the output of stainless steel (dry materials). The sludge contains valuable metal elements such as Ni, Cr, Fe, etc., as well as CaF 2 , CaO, SiO 2 , CaSO 4 and other substances, Cr in sludge 6+ Potential hazard to the environment if not handled properly. In recent years, the accumulation of stainless steel pickling sludge in my country is increasing, and the rational use of these pickling sludge is related ...

Claims

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Application Information

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IPC IPC(8): C22B1/24C21B13/08B03C1/015
CPCB03C1/015C21B13/0066C21B13/08C22B1/2406
Inventor 权芳民何成善
Owner JIUQUAN IRON & STEEL GRP
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