Chronium-nickel alloy element electric furnace smelting recovery method from stainless steel dedusting ash

A technology of electric furnace smelting and recycling method, applied in the field of nickel alloy element smelting and recycling in electric furnace, and chromium in stainless steel dust, can solve the problems of high recycling cost, waste of physical heat, long smelting time, etc., to reduce smelting cost, reduce pollution, The effect of reducing scrap loading

Inactive Publication Date: 2007-11-07
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another method is to press the stainless steel dedusting ash into the electric furnace, and then add a small amount of scrap steel. After melting, use ferrosilicon and metal aluminum to reduce the chromium, nickel and other metals in the stainless steel dedusting ash, and then cast them into ingots as stainless steel smelting. The use of raw materials, this recycling method takes a long time for electric furnace smelting, the power consumption per ton of steel is ≥2000KWH, and the recycling cost is high. The smelted molten steel ingots can only be used as smelting raw materials, wasting a lot of physical heat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, 160 tons (160 tons refers to the nominal capacity) of all scrap steel in an electric furnace is smelted with stainless steel dust removal ash. The smelting in this embodiment is 304 stainless steel, and 167 tons of raw materials are added, including 83.62 tons of high-carbon ferrochrome and 23.58 tons of returned materials. Carbon powder 3.7 tons, carbon steel scrap 15.4 tons chromium-nickel pig iron 41.38 tons electrolytic nickel 4.05 tons dust removal ash ball 14 tons.

[0028] (1) Preparation of stainless steel dust removal ash mixture

[0029] Add 4%-6% water and 3%-5% binder to stainless steel dust with nickel ≥ 1.9%, chromium ≥ 10.0%, and iron ≥ 30%, and then mix to form a mixture;

[0030] (2) Pressure ball

[0031] Press the above mixture into balls with a ball press machine, the particle size of the balls is φ80mm, and dry the pressed balls naturally until the water content is less than 3.0%;

[0032] (3) Canning

[0033] Add stainless st...

Embodiment 2

[0041] In this embodiment, 160 tons of electric furnace semi-hot molten iron is smelted with stainless steel dedusting ash. The smelting in this embodiment is 316 stainless steel. The raw materials added include 76.9 tons of pretreated molten iron, 83.8 tons of scrap steel, of which 39.5 tons are returned, high-carbon chromium 33.7 tons of iron, 10.6 tons of sintered nickel, and 9.8 tons of dust balls.

[0042] (1) Preparation of stainless steel dust removal ash mixture

[0043] Add 4%-6% water and 3%-5% binder to stainless steel dust with nickel ≥ 1.9%, chromium ≥ 10.0%, and iron ≥ 30%, and then mix to form a mixture;

[0044] (2) Pressure ball

[0045] Press the above mixture into balls with a ball press machine, the particle size of the balls is φ100mm, and dry the pressed balls naturally until the water content is less than 3%;

[0046] (3) Canning

[0047] Add stainless steel dust-removing ash balls during batching, load 83.6 tons of scrap steel, and put the dust-remov...

Embodiment 3

[0053] This embodiment is a 20-ton electric furnace (nominal capacity of 20 tons) with all steel scrap and stainless steel dust removal ash smelting. What this embodiment smelts is 304 stainless steel, and 22.6 tons of raw materials are added, of which 16.5 tons are returned to scrap steel, 3.8 tons of chromium-nickel pig iron, high carbon 2.3 tons of ferrochrome.

[0054] (1) Preparation of stainless steel dust removal ash mixture

[0055] Add 4%-6% water and 3%-5% binder to stainless steel dust with nickel ≥ 2.0%, chromium ≥ 10.0%, and iron ≥ 30%, and then mix to form a mixture;

[0056] (2) Pressure ball

[0057] Press the above mixture into balls with a ball press machine, the particle size of the balls is φ20mm, and dry the pressed balls naturally until the water content is less than 3%;

[0058] (3) Canning

[0059] Add stainless steel dedusting ash balls when batching, the raw material loaded is 22.6 tons, the ash balls loaded into the division are 2% of the raw mate...

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Abstract

The electric furnace smelting process for recovering Cr and Ni from stainless steel dust includes the following steps: 1. preparing mixed material through adding water in 4-6 wt% and adhesive in 3-5 wt% into stainless steel dust; 2. pelletizing the mixed material; 3.adding the pellet into steelmaking material in the added amount of 2.0-15.0 wt%; 4. smelting Ni-containing stainless steel in an electric furnace; and 5. tapping to obtain stainless steel. The electric furnace smelting process for recovering Cr and Ni from stainless steel dust is simple and low in cost.

Description

technical field [0001] The invention relates to an electric furnace smelting recovery method for chromium and nickel alloy elements in stainless steel dedusting ash. Background technique [0002] During the stainless steel smelting process, the dust removal system will produce a large amount of stainless steel dust, and the amount of stainless steel dust is 30-40Kg / ton of steel. Stainless steel dust contains chromium oxide and nickel oxide. By chemical analysis, the average content of chromium oxide and nickel oxide in stainless steel dust is 10.74% and 1.90%, respectively. In addition, the average content of total iron in stainless steel dust is 38.5%. If it is not recycled, it will not only pollute the environment, but also cause waste of precious metal elements such as chromium and nickel. [0003] At present, there are two ways to recover chromium and nickel alloy elements in stainless steel dust removal ash at home and abroad: one is to use the aluminothermic reduction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22B1/242C22B7/02C22C38/40
CPCY02P10/20
Inventor 段建平李宏刘卫东王建昌
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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