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A kind of preparation method of stainless steel mother liquor

A technology of stainless steel and mother liquor, applied in the field of metal smelting, can solve the problems of high equipment cost, low recovery rate of precious metals, cumbersome process, etc., and achieve the effects of low raw material cost, shortened smelting time, and simplified process flow

Active Publication Date: 2014-10-08
SICHUAN JINGUANG IND GRP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the cost of raw materials and equipment in the traditional stainless steel mother liquor preparation process is high, the process is cumbersome, and the recovery rate of precious metals is low

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  • A kind of preparation method of stainless steel mother liquor

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preparation example Construction

[0023] A kind of preparation method of stainless steel mother liquor provided by the invention comprises the following steps:

[0024] a. Using lateritic nickel ore as raw material to smelt and prepare nickel and chromium iron water;

[0025] b. Using a submerged arc furnace to smelt chrome ore to prepare high-carbon ferrochrome molten iron;

[0026] c. Blend the chromium and nickel-iron water in step a into the top-bottom combined blowing converter, and carry out desiliconization and decarburization heating treatment for 8 to 30 minutes;

[0027] d. According to the mass ratio of high-carbon ferro-chrome molten iron: chromium, ferro-nickel water = 0.20~0.60: 1, the high-carbon ferro-chromium molten iron in step b is blended into the top-bottom re-blowing converter to reduce chromium and dichromium trioxide in ferro-nickel slag , to obtain stainless steel mother liquor.

[0028] Wherein, in step a of the method for preparing the above-mentioned stainless steel mother liquor,...

Embodiment 1

[0040] a, the laterite nickel ore (its chemical composition includes by mass percentage: Ni 0.85%, TFe 49%, Cr 2 o 3 1.35%) is smelted in a blast furnace into molten chromium and nickel iron, and its chemical composition includes: Ni 1.60%, Cr 3.20%, Si 1.30%, and C 4.00%. The smelting temperature of chromium and nickel iron is 1263°C.

[0041] B, the chrome ore (the chemical composition of chrome ore comprises by mass percent: TFe16%, Cr 2 o 3 39%) to prepare high-carbon ferrochrome molten iron. The chemical composition of high-carbon ferrochromium molten iron includes: Cr 55.23%, C 7.48%, Si 3.11%. The smelting temperature of high-carbon ferrochrome hot metal is 1514°C.

[0042] c. Mix the molten inconel in step a into the top-bottom combined blowing converter for desiliconization and decarburization by blowing oxygen to raise the temperature to 1643° C. and blow for 17 minutes.

[0043] d. Turn off the oxygen, and mix the ingredients according to the requirements of...

Embodiment 2

[0047] a, the laterite nickel ore (its chemical composition includes by mass percentage: Ni 0.93%, TFe 40%, Cr 2 o 31.14%) is smelted in a blast furnace into molten chromium and nickel iron, and its chemical composition includes: Ni 2.35%, Cr 2.84%, Si 1.15%, and C 3.72%. The smelting temperature of chromium and nickel iron is 1284℃.

[0048] B, the chrome ore (the chemical composition of chrome ore comprises by mass percent: TFe 13%, Cr 2 o 3 42%) to prepare high-carbon ferrochrome molten iron. The chemical composition of high-carbon ferrochromium molten iron includes: Cr 57.45%, C 6.58%, Si 3.51%. The smelting temperature of high-carbon ferrochrome hot metal is 1534°C.

[0049] c. Mix the molten Inconel in step a into the top-bottom double-blown converter for desiliconization and decarburization by blowing oxygen and raising the temperature to 1661° C., and blowing for 21 minutes.

[0050] d. Turn off the oxygen, and mix the ingredients according to the requirements o...

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Abstract

The invention belongs to the field of metal smelting, and in particular relates to a preparation method of a stainless steel mother solution. The traditional preparation process of the stainless steel mother solution has the technical problems that cost of raw materials and equipment is high, process is complicated, and recycling rate of precious metal is low. By the preparation method provided by the invention, the problems can be solved. The method comprises the following steps of: a, smelting laterite nickel ore to prepare molten iron containing nickel and chromium; b, smelting chromium ore by using a submerged arc furnace to prepare high-carbon, high-chromium and high-iron molten iron; c, feeding the molten iron containing nickel and chromium, which is prepared in the step a into a top and bottom combined blown converter for removing silicon and carbon; and d, mixing the high-carbon, high-chromium and high-iron molten iron in chromic oxide in reducing slag of the top and bottom combined blown converter to obtain the stainless steel mother solution. The invention provides a novel method for reducing the smelting cost of the stainless steel mother solution.

Description

technical field [0001] The invention belongs to the field of metal smelting, and in particular relates to a preparation method of stainless steel mother liquor. Background technique [0002] At present, the preparation of stainless steel mother liquor at home and abroad mainly adopts electric furnace, intermediate frequency furnace, and other traditional stainless steel mother liquor preparation processes. In the preparation process, electric furnace + intermediate frequency furnace smelting process is mainly used to smelt high-carbon ferrochrome, nickel-chromium pig iron or nickel plate to smelt stainless steel mother liquor. The process of smelting solid high-carbon ferrochrome increases the cost of smelting, while the oxygen blowing in the electric furnace damages the precious metals chromium and nickel, and at the same time makes repeated configuration of equipment, which leads to high investment costs and high energy consumption. [0003] Chinese patent CN102226246A dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22C38/40
Inventor 韦成贵杜俊涛李志栋
Owner SICHUAN JINGUANG IND GRP