CN112029995A - Method for smelting ferrochrome by using ore-smelting furnace added with silica - Google Patents
Method for smelting ferrochrome by using ore-smelting furnace added with silica Download PDFInfo
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- CN112029995A CN112029995A CN202010792601.6A CN202010792601A CN112029995A CN 112029995 A CN112029995 A CN 112029995A CN 202010792601 A CN202010792601 A CN 202010792601A CN 112029995 A CN112029995 A CN 112029995A
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- silica
- smelting
- slag
- submerged arc
- ferrochrome
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B4/00—Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys
- C22B4/06—Alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/214—Sintering; Agglomerating in shaft furnaces
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/30—Obtaining chromium, molybdenum or tungsten
- C22B34/32—Obtaining chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C35/00—Master alloys for iron or steel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for smelting ferrochrome by a submerged arc furnace added with silica, which comprises the following steps: (1) putting the ferrochromium ore powder into a ball mill for ball milling, and adding bentonite and water into the ball mill to prepare a wet material; conveying the wet material to a pelletizer through a belt to pelletize; (2) conveying the water-containing pellets to a shaft furnace for roasting to prepare dry pellets; the dry pellets have the richness of 1-2 cm; (3) mixing the pellets, coke, silica and slag and then putting the mixture into an ore furnace for smelting; (4) casting the smelted molten iron into a mould; in the casting process, collecting tundish slag and putting the tundish slag into the submerged arc furnace again; (5) crushing the cast alloy; (6) finishing the crushed alloy and finishing the smelting of the ferrochrome alloy. The silica is added during smelting, so that the melting point of a slag system is reduced, and the energy consumption is reduced; the raw material adaptability and the reduction capability of the furnace are improved; improves the fluidity of the slag and improves the recovery rate of chromium.
Description
Technical Field
The invention relates to the field of metal smelting, in particular to a method for smelting ferrochrome by a submerged arc furnace added with silica.
Background
Ferrochrome is an important raw material for producing stainless steel, and is mainly applied to producing stainless steel, ball bearing bars, tool steel, nitriding steel, hot strength steel, quenched and tempered steel, carburizing steel and hydrogen-resistant steel, because chromium plays a decisive role in stainless steel, an element which determines the corrosion resistance of stainless steel is chromium, and each stainless steel contains a certain amount of chromium. In recent years, as high-quality chromium ore is consumed, thin iron alloy enterprises frost on snow, most of the enterprises begin to select the ore with poor performance such as south Africa chromium ore as a raw material, and the problems that the reduction difficulty is high, the melting point of a natural slag system is high, and a furnace charge is almost melted completely before reaching the chromium reduction temperature, so that the reduction is very difficult are brought.
Disclosure of Invention
The invention aims to provide a method for smelting ferrochromium by using a submerged arc furnace added with silica, which can effectively improve the metallurgical property of poor-quality chromium ore and reduce the reduction difficulty and melting point of the poor-quality chromium ore.
The technical scheme adopted by the invention is as follows: a method for smelting ferrochromium by a submerged arc furnace added with silica comprises the following steps:
(1) putting the ferrochromium ore powder into a ball mill for ball milling, and adding bentonite and water into the ball mill to prepare a wet material; conveying the wet material to a pelletizer through a belt to pelletize;
(2) conveying the water-containing pellets to a shaft furnace for roasting to prepare dry pellets; the dry pellets have the richness of 1-2 cm;
(3) mixing the pellets, coke, silica and slag and then putting the mixture into an ore furnace for smelting;
(4) casting the smelted molten iron into a mould; in the casting process, collecting tundish slag and putting the tundish slag into the submerged arc furnace again;
(5) crushing the cast alloy;
(6) finishing the crushed alloy and finishing the smelting of the ferrochrome alloy.
Further, the dry slag discharged in the smelting process of the submerged arc furnace forms final slag after water quenching, and the final slag is one of the slag returns.
Preferably, the particle size of the coke is 1-5cm, and the particle size of the recycled slag is 5-8 cm.
Preferably, the silica has a silica content of > 97% and an alumina content of < 1.0%; the fixed carbon content of the coke is greater than 84%.
Preferably, the silica represents 11% of the total mass of the charge.
According to the method for smelting ferrochrome by the submerged arc furnace added with silica, silica is added during smelting, so that the melting point of a slag system is reduced, and the energy consumption is reduced; the raw material adaptability and the reduction capability of the furnace are improved; improves the fluidity of the slag, ensures that the slag has better capacity of removing impurities and floating upward, and improves the recovery rate of chromium.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a flow chart of the present invention for making a ball;
Detailed Description
The present invention will be described in further detail with reference to examples.
Examples
Smelting a batch of ferrochromium, comprising the following steps:
(1) putting the ferrochromium ore powder into a ball mill for ball milling, and adding bentonite and water into the ball mill to prepare a wet material; conveying the wet material to a pelletizer through a belt to pelletize;
(2) conveying the water-containing pellets to a shaft furnace for roasting to prepare dry pellets; the dry pellets have the richness of 1-2 cm;
(3) mixing the pellets, coke, silica and slag and then putting the mixture into an ore furnace for smelting;
(4) casting the smelted molten iron into a mould; in the casting process, collecting tundish slag and putting the tundish slag into the submerged arc furnace again;
(5) crushing the cast alloy;
(6) finishing the crushed alloy and finishing the smelting of the ferrochrome alloy.
Claims (5)
1. The method for smelting ferrochrome by the submerged arc furnace added with silica is characterized by comprising the following steps of:
(1) putting the ferrochromium ore powder into a ball mill for ball milling, and adding bentonite and water into the ball mill to prepare a wet material; conveying the wet material to a pelletizer through a belt to pelletize;
(2) conveying the water-containing pellets to a shaft furnace for roasting to prepare dry pellets; the dry pellets have the richness of 1-2 cm;
(3) mixing the pellets, coke, silica and slag and then putting the mixture into an ore furnace for smelting;
(4) casting the smelted molten iron into a mould; in the casting process, collecting tundish slag and putting the tundish slag into the submerged arc furnace again;
(5) crushing the cast alloy;
(6) finishing the crushed alloy and finishing the smelting of the ferrochrome alloy.
2. The method for smelting ferrochrome by using the submerged arc furnace added with silica is characterized in that dry slag discharged in the smelting process of the submerged arc furnace forms final slag after water quenching, and the final slag is one of recycled slag.
3. The method for smelting ferrochrome in the submerged arc furnace added with silica is characterized in that the particle size of the coke is 1-5cm, and the particle size of the recycled slag is 5-8 cm.
4. The method for smelting ferrochrome in the submerged arc furnace with the addition of silica is characterized in that the content of silicon dioxide in the silica is more than 97 percent, and the content of aluminum oxide in the silica is less than 1.0 percent; the fixed carbon content of the coke is greater than 84%.
5. The method for smelting ferrochrome with the submerged arc furnace added with silica is characterized in that the silica accounts for 11 percent of the total mass of the furnace charge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010792601.6A CN112029995A (en) | 2020-08-09 | 2020-08-09 | Method for smelting ferrochrome by using ore-smelting furnace added with silica |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010792601.6A CN112029995A (en) | 2020-08-09 | 2020-08-09 | Method for smelting ferrochrome by using ore-smelting furnace added with silica |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112029995A true CN112029995A (en) | 2020-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010792601.6A Pending CN112029995A (en) | 2020-08-09 | 2020-08-09 | Method for smelting ferrochrome by using ore-smelting furnace added with silica |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113265534A (en) * | 2021-04-14 | 2021-08-17 | 嘉峪关宏电铁合金有限责任公司 | Low-grade ferrochromium slag recycling production process |
| CN114149267A (en) * | 2021-11-18 | 2022-03-08 | 偏关县晋电化工有限责任公司 | Slag hole protection material for submerged arc furnace |
| CN114921648A (en) * | 2022-06-17 | 2022-08-19 | 山西太钢万邦炉料有限公司 | Method for producing high-silicon furnace material ferrochrome by submerged arc furnace |
| CN115522083A (en) * | 2022-10-12 | 2022-12-27 | 嘉峪关宏电铁合金有限责任公司 | Method for reducing crushing difficulty of high-carbon ferrochrome |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3993471A (en) * | 1974-09-09 | 1976-11-23 | Showa Denko Kabushiki Kaisha | Method for manufacture of reduced pellets |
| CN104593585A (en) * | 2014-04-15 | 2015-05-06 | 丰镇市新太新材料科技有限公司 | Chromium ore pellet pre-reduction direct-supply submerged arc furnace system and pre-reduction direct-supply method |
| WO2017063250A1 (en) * | 2015-10-14 | 2017-04-20 | 福建鼎信实业有限公司 | Production method for hot-delivering oxidized pellets in shaft furnace to sealed ferrochrome electric furnace |
| CN107385213A (en) * | 2017-07-03 | 2017-11-24 | 江苏省冶金设计院有限公司 | A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome |
| CN107699685A (en) * | 2017-08-09 | 2018-02-16 | 江苏省冶金设计院有限公司 | A kind of production method of silicochromium |
-
2020
- 2020-08-09 CN CN202010792601.6A patent/CN112029995A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3993471A (en) * | 1974-09-09 | 1976-11-23 | Showa Denko Kabushiki Kaisha | Method for manufacture of reduced pellets |
| CN104593585A (en) * | 2014-04-15 | 2015-05-06 | 丰镇市新太新材料科技有限公司 | Chromium ore pellet pre-reduction direct-supply submerged arc furnace system and pre-reduction direct-supply method |
| WO2017063250A1 (en) * | 2015-10-14 | 2017-04-20 | 福建鼎信实业有限公司 | Production method for hot-delivering oxidized pellets in shaft furnace to sealed ferrochrome electric furnace |
| CN107385213A (en) * | 2017-07-03 | 2017-11-24 | 江苏省冶金设计院有限公司 | A kind of method that chromite ore fine directly enters stove smelting high carbon ferrochrome |
| CN107699685A (en) * | 2017-08-09 | 2018-02-16 | 江苏省冶金设计院有限公司 | A kind of production method of silicochromium |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113265534A (en) * | 2021-04-14 | 2021-08-17 | 嘉峪关宏电铁合金有限责任公司 | Low-grade ferrochromium slag recycling production process |
| CN114149267A (en) * | 2021-11-18 | 2022-03-08 | 偏关县晋电化工有限责任公司 | Slag hole protection material for submerged arc furnace |
| CN114921648A (en) * | 2022-06-17 | 2022-08-19 | 山西太钢万邦炉料有限公司 | Method for producing high-silicon furnace material ferrochrome by submerged arc furnace |
| CN115522083A (en) * | 2022-10-12 | 2022-12-27 | 嘉峪关宏电铁合金有限责任公司 | Method for reducing crushing difficulty of high-carbon ferrochrome |
| CN115522083B (en) * | 2022-10-12 | 2023-09-22 | 嘉峪关宏电铁合金有限责任公司 | Method for reducing crushing difficulty of high-carbon ferrochrome |
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Application publication date: 20201204 |