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Method for smelting stainless steel mother liquid by using chromium mineral powder and laterite as raw materials

A technology for laterite ore and chrome ore powder, applied in blast furnaces, furnace types, furnaces, etc., can solve problems such as the inability to meet the requirements of stainless steel smelting, and achieve the effects of reducing sintering process, reducing costs, and avoiding environmental pollution

Active Publication Date: 2010-05-05
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Baosteel has studied and tested the use of chrome ore to produce chromium-containing hot metal on a 255m3 blast furnace, but the phosphorus content of the produced chromium-containing hot metal is as high as 0.108%, while the phosphorus content in stainless steel is required to be less than 0.035%, which is far from meeting the requirements of stainless steel smelting
There is no effective dephosphorization technology for stainless steel smelting, and the stainless steel mother liquor that meets the requirements can only be smelted by controlling the raw materials and the process of smelting stainless steel mother liquor

Method used

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  • Method for smelting stainless steel mother liquid by using chromium mineral powder and laterite as raw materials
  • Method for smelting stainless steel mother liquid by using chromium mineral powder and laterite as raw materials
  • Method for smelting stainless steel mother liquid by using chromium mineral powder and laterite as raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This example uses the figure 2 Described novel small shaft furnace, the furnace capacity 4m of the novel shaft furnace test furnace of present embodiment 3 , about 1m in diameter, 4m in height, one taphole 9, one tuyere 6, no sealing facilities for charging, gravity dust collector, no fine dust removal facilities, a set of heat exchanger 24 built with refractory materials, see structure image 3 . Hot air temperature: 530~680℃, the furnace body is cooled by spraying. The aperture of taphole 9 is 20mm. The slag outlet 8 has no cooling jacket. The material batch is 120kg / batch, 4~6 batches / hour, the iron output per hour is 300~360kg, and the ingot is directly cast when iron is tapped. The coke ratio is 1300~2500kg / t.

[0062] The steps in this embodiment are as follows in sequence.

[0063] (1) Mixing

[0064] Mix chrome ore powder, laterite ore and composite binder evenly, and the mass ratio of the four is:

[0065] Chromium ore powder 30 Laterite ore 52 Composi...

Embodiment 2

[0099] This example uses the figure 2 A new type of small shaft furnace described. This embodiment is different from step (3) batching, step (4) smelting and step (5) of embodiment one. Add hot-rolled steel scrap in step (3), the composition of every batch of charge:

[0100] Agglomerate 110kg Reduction accelerator 10kg Slagging agent 10kg

[0101] Coke 120kg scrap steel 16kg.

[0102] When step (4) smelting, load in every hour:

[0103] Agglomerate 440kg Reduction accelerator 40kg Slagging agent 40kg Scrap steel 64kg

[0104] In (five) go out the composition mass percent of nickel-containing molten iron to be:

[0105] C: 5.12% Si: 1.18% Mn: 1.25% Ni: 2.2%

[0106] Cr: 10P: 0.043S: 0.080

[0107] The rest is Fe and unavoidable impurities.

[0108] The mass percent of SiO2, CaO, MgO and Cr2O3 in the slag is:

[0109] SiO2: 36.5 CaO: 34.6 MgO: 10.2 Cr2O3: 1.1

[0110] Chromium recovery rate is 93%.

Embodiment 3

[0112] This example uses the figure 1 and image 3 The new shaft furnace described has a furnace capacity of 85m3, an inner diameter of 2.9m, and a height of 12m. The material batch is 2500kg / batch, 4 to 6 batches / hour. There is no dedusting facility, and a simple heat exchanger 24 built of refractory materials is configured to supply hot air. Wind temperature: 800~960℃; oxygen enrichment rate 5~20%. The furnace body is cooled by spraying. The iron output per hour is 15-25 tons, and the iron is delivered by hot delivery or direct ingot casting. The coke ratio is 700~1300kg / t.

[0113] The steps of this embodiment are as follows:

[0114] (1) Mixing

[0115] Mix chromium ore powder, laterite ore, coke powder and composite binder evenly, and the mass ratio of the four is:

[0116] Chromium Ore Powder 30 Laterite Ore 60 Composite Binder 10 Coke Powder 10

[0117] Chromium ore powder and lateritic ore are in powder form, with a particle size of 100 mesh to 0.1mm accounting...

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PUM

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Abstract

The invention relates to a method for smelting stainless steel mother liquid by using chromium mineral powder and laterite as raw materials, which comprises the sequential steps of mixing, briquetting, proportioning, burning and smelting to obtain chromium-containing molten iron, wherein (1) mixing: uniformly mixing chromium mineral powder, laterite, coal powder or coke powder and composite binder; (2) briquetting: putting the mixture into a briquetting machine for briquetting, and then, drying or curing the briquettes to the specified strength; (3) proportioning: adding the dried or cured briquettes into a reduction accelerator and a slag preparing agent, and proportioning the briquettes, the reduction accelerator and the slag preparing agent; (4) smelting: adding the proportioned raw materials into a small blast furnace or new vertical furnace with an iron opening and an air opening from a furnace opening, and adding coke for smelting; and (5) tapping and transmitting the smelted chromium-bearing molten iron (i.e. stainless steel mother liquid) into steel works, or casting the smelted chromium-containing molten iron into iron ingots. The method for smelting stainless steel mother liquid by using chromium mineral powder and laterite as raw materials has lower production cost and reduces the environment pollution.

Description

technical field [0001] The invention relates to a method for smelting stainless steel mother liquor by using chromium ore powder and laterite ore as raw materials. Background technique [0002] Due to the high reduction temperature of chromium ore powder and laterite ore, the reduction heat consumption is large, and the chromium ore contains high Al 2 o 3 , MgO, its natural slag has poor fluidity and complex mineral composition, which makes it difficult to smelt chrome ore. Therefore, at present, ferrochromium is mainly obtained through high-temperature reduction in submerged arc furnaces, and used as raw materials for stainless steel smelting. 80% of the production cost of stainless steel belongs to the cost of raw materials. Ferrochrome and nickel are high-priced raw materials for stainless steel making. Metallurgists are constantly exploring and researching the process of obtaining stainless steel mother liquor cheaply to reduce the production cost of stainless steel. A...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/08C22C35/00C22B5/10C21B5/00C21B11/02
Inventor 赵海泉王立新王钢蔡湄夏史永林赵建伟樊猛辉
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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