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Rotary hearth furnace and electric furnace reduction treatment process for stainless steel dedusting ash

A treatment process and rotary hearth furnace technology, which is applied in the direction of rotary drum furnace, process efficiency improvement, furnace, etc., can solve the problems of thin material layer in the furnace, retention, kiln body is easy to form rings, etc., to improve the heat transfer temperature difference , Improve efficiency, increase production capacity and restore quality

Inactive Publication Date: 2020-10-13
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(1) The rotary hearth furnace process is a mature technology for treating zinc-containing dust and sludge in a few domestic iron and steel plants. This reduction process has certain advantages in treating iron and zinc-containing materials such as blast furnace gas mortar in iron and steel plants, but there are also difficulties that are difficult to overcome. Disadvantages, such as large investment in project construction, thin layer of materials in the furnace, low metallization rate and dezincification rate of products, low energy utilization efficiency, etc., greatly limit the promotion and application in the steel industry
(2) The direct reduction process of dust removal rotary kiln is a mature process technology for most domestic iron and steel plants to deal with zinc-containing dust sludge. This direct reduction method has the advantages of simple process, small project investment, and low production and operation costs (no need to purchase gas fuel) etc. It has certain advantages when used to process iron and zinc-containing materials such as carbon steel dust in iron and steel plants. However, when the rotary kiln process is used to process stainless steel dust, there are problems such as high reduction temperature, low metal recovery rate, and easy kiln body. Problems such as knotting
Due to the limitation of production cost, the above various hydrogen metallurgical processes are only based on laboratory experiments and mechanism research, and there are no industrial application examples

Method used

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  • Rotary hearth furnace and electric furnace reduction treatment process for stainless steel dedusting ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A stainless steel dedusting ash rotary hearth furnace-electric furnace reduction treatment process, comprising the following steps:

[0049] S1 raw material treatment: stack the stainless steel dedusting ash with a moisture content above 6% in the site for conversion, so that the CaO entrained in the dedusting ash absorbs the moisture in the air and converts it into Ca(OH) 2 , and then dried for later use; select high-volatile coal with fixed carbon content of 44-46%, ash content of 7-9%, volatile content of 47-49%, particle size less than 20mm, preferably lignite, and high-volatile coal Grind until the particle size is less than 200 mesh, accounting for more than 80% for later use;

[0050] S2 material preparation: according to parts by weight, select 100 parts of stainless steel dedusting ash, 25 parts of lignite, and 2 parts of adhesive, and then carry out batching and mixing;

[0051] S3 pellet preparation: preparing the material obtained in step S2 into wet pellet...

Embodiment 2

[0055] A stainless steel dedusting ash rotary hearth furnace-electric furnace reduction treatment process, comprising the following steps:

[0056] S1 raw material treatment: stack the stainless steel dedusting ash with a moisture content above 6% in the site for conversion, so that the CaO entrained in the dedusting ash absorbs the moisture in the air and converts it into Ca(OH) 2 , and then dried for later use; select high-volatile coal with fixed carbon content of 44-46%, ash content of 7-9%, volatile content of 47-49%, particle size less than 20mm, preferably lignite, and high-volatile coal Grind until the particle size is less than 200 mesh, accounting for more than 80% for later use;

[0057] S2 material preparation: according to parts by weight, select 100 parts of stainless steel dedusting ash, 30 parts of lignite, and 2 parts of adhesive, and then carry out batching and mixing;

[0058] S3 pellet preparation: preparing the material obtained in step S2 into wet pellet...

Embodiment 3

[0062] A stainless steel dedusting ash rotary hearth furnace-electric furnace reduction treatment process, comprising the following steps:

[0063] S1 raw material treatment: stack the stainless steel dedusting ash with a moisture content above 6% in the site for conversion, so that the CaO entrained in the dedusting ash absorbs the moisture in the air and converts it into Ca(OH) 2, and then dried for later use; select high-volatile coal with fixed carbon content of 44-46%, ash content of 7-9%, volatile content of 47-49%, particle size less than 20mm, preferably lignite, and high-volatile coal Grind until the particle size is less than 200 mesh, accounting for more than 80% for later use;

[0064] S2 material preparation: according to parts by weight, select 100 parts of stainless steel dedusting dust, 35 parts of high volatile coal, and 3 parts of adhesive, and carry out batching and mixing;

[0065] S3 pellet preparation: preparing the material obtained in step S2 into wet ...

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Abstract

The invention discloses a rotary hearth furnace and electric furnace reduction treatment process for stainless steel dedusting ash. The process mainly comprises the steps that after being fully slakedand dried, the stainless steel dedusting ash is compounded and mixed with brown coal and a binding agent; a mixture is produced into carbon-containing pellets with the diameter ranging from 18 mm to25 mm; after being dried through a drier, the pellets are laid on the furnace bottom of a hydrogen metallurgy rotary hearth furnace, and the thickness of a fabric is controlled to range from 60 mm to70 mm; reduction is conducted on the pellets in the furnace for 50-60 minutes at the temperature of 1250-1280 DEG C, and Fe, Cr and Ni in the stainless steel dedusting ash can be obtained through reduction; and after being discharged through a discharging end of the rotary hearth furnace, a high-temperature reduction material in the hot state is directly delivered into an electric furnace for deepreduction and melting separation, and molten iron containing 4-6% of Ni, 10-15% of Cr and 0.5-1.0% of C can be obtained. By means of the process, metal materials, such as iron, nickel and chromium, in the stainless steel dedusting ash can be obtained through reduction at the low cost; the utilization rates of nickel and chromium raw materials are effectively increased; the yields of a nickel alloy and a chromium alloy are effectively increased; and meanwhile, environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and mineral engineering, and in particular relates to a stainless steel dedusting ash rotary hearth furnace-electric furnace reduction treatment process. Background technique [0002] Nickel-chromium-iron alloy is mainly used in stainless steel and heat-resistant steel. 65% of my country's nickel output and 80% of chromium output are used in stainless steel production. In recent years, the average annual growth rate of global stainless steel demand has exceeded 10%, while China is the country with the fastest growth rate of stainless steel consumption, with an average annual growth rate of more than 20%. With the rapid growth of the demand for stainless steel in recent years, the demand for nickel and chromium alloys has also increased significantly. Due to the relatively poor nickel and chromium resources in my country, 60% of nickel resources and 85% of chromium resources need to be imported...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/08C22B1/242C22B7/02C22B34/32C22B23/02
CPCC21B13/085C21B13/0066C22B1/2406C22B1/242C22B7/02C22B7/001C22B34/32C22B23/023Y02P10/20
Inventor 权芳民李昕何成善周赞英王慧玲
Owner JIUQUAN IRON & STEEL GRP
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