Method for smelting chromated-nickel-containing molten iron by stainless steel dedusting ash and iron scale companion material

A technology for stainless steel and molten iron, which is applied in the field of stainless steel dust removal and iron scale smelting of chromium-nickel molten iron. It can solve the problems of short metal oxide reduction time, low reduction rate, and high dryness requirements, and achieves good environmental protection effect and high production efficiency. The effect of high efficiency and low cost

Active Publication Date: 2010-02-24
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is reported that using the Star furnace alone to smelt stainless steel for dust removal has also achieved good results, but the use of the injection method requires high dryness requirements for material storage, and the metal oxide reduction time is short and the reduction rate is low.

Method used

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  • Method for smelting chromated-nickel-containing molten iron by stainless steel dedusting ash and iron scale companion material
  • Method for smelting chromated-nickel-containing molten iron by stainless steel dedusting ash and iron scale companion material
  • Method for smelting chromated-nickel-containing molten iron by stainless steel dedusting ash and iron scale companion material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] This example uses the figure 2 Described novel small shaft furnace, the furnace capacity of the novel shaft furnace test furnace of the present embodiment is 4m 3 , about 1.2m in diameter, 4m high, a taphole 9, a tuyere 6, no sealing facility for charging, and a gravity dust collector. No dedusting facilities, equipped with a set of heat exchanger 24 built with refractory materials, the structure see image 3 . Manual feeding, manual weighing. Hot air temperature: 530~660℃, the furnace body is spray cooled. A small cast iron trolley and eight molds are set in front of the furnace, which can cast about 300kg of iron at a time. The aperture of taphole 9 is 20mm. The slag outlet 8 has no cooling jacket.

[0066] The steps of this embodiment are as follows:

[0067] (1) Mixing

[0068] The mass ratio of the raw materials forming the cold-solidified agglomerate of stainless steel dedusting ash is:

[0069] Stainless steel dust 76 bentonite 2 cement 12 other mixture ...

Embodiment 2

[0100] There are three points of difference between this embodiment and Example 1: the raw materials used during step (1) mixing are different, coal powder is added in the mixing, and the raw materials of the dust-removing ash mixture are formed by the following proportioning mixing The mass parts proportioning is:

[0101] Stainless steel dust 75 bentonite 1 pulverized coal 10 cement 12

[0102] In addition, the mixture maintains 10 parts of water;

[0103] All the above-mentioned raw materials are processed into powders of less than 200 meshes, accounting for more than 60%. After the above-mentioned mass fraction is prepared, put it into the mixer and mix it evenly.

[0104] In addition, the composition of the molten iron in step (five) is different from that of embodiment one, and the composition mass percentage of the molten iron of the present embodiment is:

[0105] C: 5.54% Si: 0.95% Mn: 1.12% P: 0.050% S: 0.143%

[0106] Cr: 13.59% Ni: 4.93 The remainder is Fe and ...

Embodiment 3

[0111] The main difference between this embodiment and Example 1 is that (1) the raw materials used in mixing are different. In this embodiment, iron scales are also added to the dust-removing ash mixture, and the dust-removing ash mixture is proportioned according to the following parts by mass Mixture:

[0112] Stainless steel dust 77 iron scale 15 bentonite 1.0 cement 12 water distribution is 7

[0113] The raw materials required for the above-mentioned pressure balls are all processed into powders with a mesh size of 200 or less, accounting for more than 60%. After the above-mentioned mass fraction is prepared, put it into the mixer and mix it evenly. See Table 2 for the mass percentages of the components of the pressed balls.

[0114] Table 2: The mass percentage % of the composition of the pressed ball

[0115] Fe 2 o 3

FeO

SiO 2

AI 2 o 3

CaO

MgO

P

S

C

45.35

6.04

5.79

2.70

7.81 ...

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Abstract

The invention relates to a method for smelting chromated-nickel-containing molten iron by stainless steel dedusting ash and iron scale companion material, which comprises the steps of mixing, briquetting, dosing, smelting and producing the molten iron; wherein (1) mixing: evenly mixing the dedusting ash, bentonite, cement, solvent, iron scale or scrap iron and water; (2) briquetting: putting the mixed material into a briquetting machine to be briquetted; (3) dosing: 60-80 parts by weight of block mass, 30-50 parts by weight of coke and 3-12 parts by weight of solvent; or 60-80 parts by weightof block mass, 30-50 parts by weight of coke, 3-12 parts by weight of solvent and 6-20 parts by weight of slag-metal; (4) smelting: adding the prepared raw materials into a novel shaft furnace or a minitype blast furnace provided with a single iron notch and a single air inlet to be smelted; and (5) producing the molten iron: sending the smelted molten iron into steel plants or casting into iron ingots. Or in step (3), 6-20 parts by weight of slag-metal can be added into the material. The smelting method is low in production cost and high in content of chromium and nickel of the product.

Description

technical field [0001] The invention relates to a method for smelting chromium-nickel iron water with stainless steel dust removal ash and iron scale companion materials. Background technique [0002] The accompanying waste of stainless steel contains precious metals such as chromium and nickel, and its utilization value is extremely high. If the treatment process with low recovery rate or direct landfill disposal is adopted, it will inevitably cause the loss of precious chromium and nickel resources and pollute the environment. At present, there are mainly two recycling processes: (1) After the associated resources of stainless steel are mixed and granulated with reducing agent carbon, the existing electric furnace of the steel plant is used to smelt, so that the valuable metals are reduced and recycled in stainless steel water; but the recovery rate is low Production organization is more difficult. (2) Use the Kawasaki Star shaft furnace process in Japan to process stainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248C21B5/02C21B11/02
Inventor 张华赵天祥冯焕林李建军赵海泉叶文成
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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