CN111321262A - Converter steel slag treatment and separation method - Google Patents
Converter steel slag treatment and separation method Download PDFInfo
- Publication number
- CN111321262A CN111321262A CN202010220316.7A CN202010220316A CN111321262A CN 111321262 A CN111321262 A CN 111321262A CN 202010220316 A CN202010220316 A CN 202010220316A CN 111321262 A CN111321262 A CN 111321262A
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- steel slag
- slag
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- 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
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
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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
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
A converter steel slag processing and separating method comprises the steps of oxidation, hot splashing, screening, acid leaching, separation, precipitation, crushing and the like, effectively separates all substances in converter steel slag, successfully realizes recycling of the slag, extracts phosphate products at low cost, and exerts the value of the converter steel slag to the greatest extent.
Description
Technical Field
The invention relates to the technical field of metallurgical resource recycling, in particular to a converter steel slag treatment and separation method.
Background
Steel slag is a by-product of starvation produced in the steel industry, and the production amount of the steel slag is about 13% of the yield of molten steel. At present, most of steel-making processes in China adopt dephosphorization and decarburization carried out in the same converter to generate converter steel slag, the converter steel slag mainly comprises calcium oxide, silicon oxide and iron oxide and has higher alkalinity, and the converter steel slag is regarded as a potential metallurgical resource due to the rich components necessary in steel production.
Converter slags usually contain 2 to 5% of P2O5When the slag is used as a metallurgical resource and returned to sintering for reuse, the phosphorus content in molten iron is increased, so that the dephosphorization burden in subsequent smelting engineering is increased, and the doping amount of the converter steel slag in the sintered ore is low. The utilization of steel slag in China is mainly concentrated on steel slag cement, concrete, building material products and road engineering, but the utilization amount of the steel slag is limited in the use of low added values, so that the comprehensive utilization rate of the steel slag in China is low. This not only wastes a large amount of metallurgical resources, but also creates a tremendous environmental pressure. How to utilize the steel slag efficiently on a large scale is an important issue which needs to be solved urgently in the steel industry, and therefore, steel enterprises strive to develop advanced steel slag treatment processes and resource utilization technologies all the time.
Disclosure of Invention
Aiming at the problem of poor multi-elasticity resistance of the existing ceramic composite armor, the invention provides a converter steel slag treatment and separation method, which has the advantages of high production efficiency, low cost, simple preparation process and suitability for large-scale production.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for treating and separating converter steel slag comprises the following steps:
and (3) oxidation:
spreading liquid steel slag which is just taken out of the furnace at the bottom of the slag pit, and blowing oxygen to the bottom of the slag pit to oxidize ferrous oxide in the liquid steel slag into ferric oxide;
hot pouring:
placing the oxidized hot slag into a hot slag splashing pool, quenching by water and quenching to enable the steel slag to react with water and enable calcium oxide and magnesium oxide to react with the water to form calcium hydroxide and magnesium hydroxide, and enabling the steel slag to be self-decomposed and pulverized due to different volume expansion coefficients;
screening:
crushing and screening the steel slag, and removing smaller steel slag to obtain larger steel slag;
acid leaching:
soaking the larger steel slag into an inorganic acid solution to obtain an acid leaching mixed solution, controlling the pH value of the acid leaching mixed solution to be 2-3, and continuously stirring;
separation:
carrying out solid-liquid separation on the acid leaching mixed solution to obtain residue A and leaching solution A;
and (3) precipitation:
adding alkaline substances into the leaching solution A to adjust the leaching solution A to be alkalescent so as to generate precipitate; separating the precipitate to obtain phosphorus resource powder;
crushing:
and crushing and sorting the residue A, and screening by an electromagnetic self-discharging iron remover to obtain a magnetic separation A and tailings A.
Further, in the oxidizing step, the thickness of the liquid steel slag is more than 500 mm.
Further, in the oxidation step, the temperature of the liquid steel slag is 500-1000 ℃.
Further, in the acid leaching step, the inorganic acid solution is an electrodeless acid solution formed by mixing hydrochloric acid and nitric acid solution according to the mass ratio of 1: 1.
Further, in the screening step, the smaller steel slag is steel slag with the diameter smaller than 200 mm.
Further, the small steel slag is crushed and stripped, and then is screened by an electromagnetic self-discharging iron remover to obtain magnetic separation powder and tailings.
Further, in the precipitation process, the alkaline substance is calcium hydroxide or sodium hydroxide.
Further, in the precipitation process, the pH value of the weak alkali is 7.5-8.5.
Compared with the prior art, the invention has the advantages and positive effects that:
1. the method for treating and separating the converter steel slag effectively separates various substances in the converter steel slag, successfully realizes the recycling of the slag, extracts phosphate products at low cost and exerts the value of the converter steel slag to the maximum extent.
2. According to the method for treating and separating the converter steel slag, provided by the invention, different types of screening equipment with different magnetic field strengths can be arranged according to the iron-containing properties of the steel slag with different size fractions, so that iron in the steel slag is completely recovered, the generated tailings can be further processed, the complete utilization of the steel slag is realized, and the value of the converter steel slag is exerted to the greatest extent.
3. The method for treating and separating the converter steel slag provided by the invention has the advantages of simple process, low equipment requirement, high production efficiency, low cost and good market popularization prospect.
Detailed Description
For a better understanding of the present invention, the present invention is further described below in conjunction with specific embodiments.
Example 1:
a method for treating and separating converter steel slag comprises the following steps:
and (3) oxidation:
spreading liquid steel slag just discharged from the furnace at the bottom of the slag pit, and blowing oxygen to the bottom of the slag pit to oxidize ferrous oxide in the liquid steel slag into ferric oxide, wherein the thickness of the liquid steel slag is more than 500mm and the temperature is 500 ℃;
hot pouring:
placing the oxidized hot slag into a hot slag splashing pool, quenching by water and quenching to enable the steel slag to react with water and enable calcium oxide and magnesium oxide to react with the water to form calcium hydroxide and magnesium hydroxide, and enabling the steel slag to be self-decomposed and pulverized due to different volume expansion coefficients;
screening:
crushing and screening the steel slag, removing smaller steel slag to obtain larger steel slag, wherein the smaller steel slag is steel slag with the diameter smaller than 200mm, and the smaller steel slag is crushed and stripped and then screened by an electromagnetic self-discharging iron remover to obtain magnetic separation powder and tailings;
acid leaching:
soaking larger steel slag into an inorganic acid solution to obtain an acid leaching mixed solution, controlling the pH value of the acid leaching mixed solution to be 2, and continuously stirring, wherein the inorganic acid solution is an electrodeless acid solution formed by mixing hydrochloric acid and a nitric acid solution according to the mass ratio of 1: 1;
separation:
carrying out solid-liquid separation on the acid leaching mixed solution to obtain residue A and leaching solution A;
and (3) precipitation:
adding calcium hydroxide into the leaching solution A, and adjusting the pH value to 7.5 to generate a precipitate; separating the precipitate to obtain phosphorus resource powder;
crushing:
and crushing and sorting the residue A, and screening by an electromagnetic self-discharging iron remover to obtain a magnetic separation A and tailings A.
Example 2:
a method for treating and separating converter steel slag comprises the following steps:
and (3) oxidation:
spreading liquid steel slag just discharged from the furnace at the bottom of the slag pit, and blowing oxygen to the bottom of the slag pit to oxidize ferrous oxide in the liquid steel slag into ferric oxide, wherein the thickness of the liquid steel slag is more than 500mm and the temperature is 750 ℃;
hot pouring:
placing the oxidized hot slag into a hot slag splashing pool, quenching by water and quenching to enable the steel slag to react with water and enable calcium oxide and magnesium oxide to react with the water to form calcium hydroxide and magnesium hydroxide, and enabling the steel slag to be self-decomposed and pulverized due to different volume expansion coefficients;
screening:
crushing and screening the steel slag, removing smaller steel slag to obtain larger steel slag, wherein the smaller steel slag is steel slag with the diameter smaller than 200mm, and the smaller steel slag is crushed and stripped and then screened by an electromagnetic self-discharging iron remover to obtain magnetic separation powder and tailings;
acid leaching:
soaking larger steel slag into an inorganic acid solution to obtain an acid leaching mixed solution, controlling the pH value of the acid leaching mixed solution to be 2.5, and continuously stirring, wherein the inorganic acid solution is an electrodeless acid solution formed by mixing hydrochloric acid and nitric acid solution according to the mass ratio of 1: 1;
separation:
carrying out solid-liquid separation on the acid leaching mixed solution to obtain residue A and leaching solution A;
and (3) precipitation:
adding sodium hydroxide into the leaching solution A, and adjusting the pH value to 8 to generate a precipitate; separating the precipitate to obtain phosphorus resource powder;
crushing:
and crushing, crushing and sorting the residue A, and screening by an electromagnetic self-discharging iron remover to obtain a magnetic separation A and tailings A.
Example 3:
a method for treating and separating converter steel slag comprises the following steps:
and (3) oxidation:
then spreading liquid steel slag just discharged from the furnace at the bottom of the slag pit, and blowing oxygen to the bottom of the slag pit to oxidize ferrous oxide in the liquid steel slag into ferric oxide, wherein the thickness of the liquid steel slag is more than 500mm and the temperature is 1000 ℃;
hot pouring:
placing the oxidized hot slag into a hot slag splashing pool, quenching by water and quenching to enable the steel slag to react with water and enable calcium oxide and magnesium oxide to react with the water to form calcium hydroxide and magnesium hydroxide, and enabling the steel slag to be self-decomposed and pulverized due to different volume expansion coefficients;
screening:
crushing and screening the steel slag, removing smaller steel slag to obtain larger steel slag, wherein the smaller steel slag is steel slag with the diameter smaller than 200mm, and the smaller steel slag is crushed and stripped and then screened by an electromagnetic self-discharging iron remover to obtain magnetic separation powder and tailings;
acid leaching:
soaking larger steel slag into an inorganic acid solution to obtain an acid leaching mixed solution, controlling the pH value of the acid leaching mixed solution to be 3, and continuously stirring, wherein the inorganic acid solution is an electrodeless acid solution formed by mixing hydrochloric acid and a nitric acid solution according to the mass ratio of 1: 1;
separation:
carrying out solid-liquid separation on the acid leaching mixed solution to obtain residue A and leaching solution A;
and (3) precipitation:
adding sodium hydroxide into the leaching solution A, and adjusting the pH value to 8.5 to generate a precipitate; separating the precipitate to obtain phosphorus resource powder;
crushing:
and crushing and sorting the residue A, and screening by an electromagnetic self-discharging iron remover to obtain a magnetic separation A and tailings A.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.
Claims (8)
1. A method for treating and separating converter steel slag is characterized by comprising the following steps: the method comprises the following steps:
and (3) oxidation:
spreading liquid steel slag which is just taken out of the furnace at the bottom of the slag pit, and blowing oxygen to the bottom of the slag pit to oxidize ferrous oxide in the liquid steel slag into ferric oxide;
hot pouring:
placing the oxidized hot slag into a hot slag splashing pool, quenching by water and quenching to enable the steel slag to react with water and enable calcium oxide and magnesium oxide to react with the water to form calcium hydroxide and magnesium hydroxide, and enabling the steel slag to be self-decomposed and pulverized due to different volume expansion coefficients;
screening:
crushing and screening the steel slag, and removing smaller steel slag to obtain larger steel slag;
acid leaching:
soaking the larger steel slag into an inorganic acid solution to obtain an acid leaching mixed solution, controlling the pH value of the acid leaching mixed solution to be 2-3, and continuously stirring;
separation:
carrying out solid-liquid separation on the acid leaching mixed solution to obtain residue A and leaching solution A;
and (3) precipitation:
adding alkaline substances into the leaching solution A to adjust the leaching solution A to be alkalescent so as to generate precipitate; separating the precipitate to obtain phosphorus resource powder;
crushing:
and crushing and sorting the residue A, and screening by an electromagnetic self-discharging iron remover to obtain a magnetic separation A and tailings A.
2. The method for treating and separating converter steel slag according to claim 1, wherein the method comprises the following steps: in the oxidation step, the thickness of the liquid steel slag is more than 500 mm.
3. The method for treating and separating converter steel slag according to claim 1, wherein the method comprises the following steps: in the oxidation step, the temperature of the liquid steel slag is 500-1000 ℃.
4. The method for treating and separating converter steel slag according to claim 1, wherein the method comprises the following steps: in the acid leaching step, the inorganic acid solution is an electrodeless acid solution formed by mixing hydrochloric acid and nitric acid solution according to the mass ratio of 1: 1.
5. The method for treating and separating converter steel slag according to claim 1, wherein the method comprises the following steps: in the screening step, the smaller steel slag is steel slag with the diameter smaller than 200 mm.
6. The method for treating and separating converter steel slag according to claim 5, wherein the method comprises the following steps: and crushing and stripping the smaller steel slag, and screening by using an electromagnetic self-discharging iron remover to obtain magnetic separation powder and tailings.
7. The method for treating and separating converter steel slag according to claim 1, wherein the method comprises the following steps: in the precipitation process, the alkaline substance is calcium hydroxide or sodium hydroxide.
8. The method for treating and separating converter steel slag according to claim 1, wherein the method comprises the following steps: in the precipitation process, the pH value of the alkalescence is 7.5-8.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010220316.7A CN111321262A (en) | 2020-03-25 | 2020-03-25 | Converter steel slag treatment and separation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010220316.7A CN111321262A (en) | 2020-03-25 | 2020-03-25 | Converter steel slag treatment and separation method |
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| CN111321262A true CN111321262A (en) | 2020-06-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114045365A (en) * | 2021-10-09 | 2022-02-15 | 西宁特殊钢股份有限公司 | Steel slag treatment process and application of obtained tailings |
| CN115679022A (en) * | 2021-07-23 | 2023-02-03 | 中国科学院过程工程研究所 | Treatment method for stabilizing steel slag |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080148902A1 (en) * | 2006-12-21 | 2008-06-26 | Westwood Lands, Inc. | Processing of steel making slags |
| CN108239684A (en) * | 2017-12-08 | 2018-07-03 | 河北新烨工程技术有限公司 | A kind of converter slag New Process for Treatment |
| CN110499400A (en) * | 2019-09-26 | 2019-11-26 | 东北大学 | A kind of converter slag high-efficiency resource recycling method |
-
2020
- 2020-03-25 CN CN202010220316.7A patent/CN111321262A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080148902A1 (en) * | 2006-12-21 | 2008-06-26 | Westwood Lands, Inc. | Processing of steel making slags |
| CN108239684A (en) * | 2017-12-08 | 2018-07-03 | 河北新烨工程技术有限公司 | A kind of converter slag New Process for Treatment |
| CN110499400A (en) * | 2019-09-26 | 2019-11-26 | 东北大学 | A kind of converter slag high-efficiency resource recycling method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115679022A (en) * | 2021-07-23 | 2023-02-03 | 中国科学院过程工程研究所 | Treatment method for stabilizing steel slag |
| CN115679022B (en) * | 2021-07-23 | 2024-03-01 | 中国科学院过程工程研究所 | Steel slag stabilization treatment method |
| CN114045365A (en) * | 2021-10-09 | 2022-02-15 | 西宁特殊钢股份有限公司 | Steel slag treatment process and application of obtained tailings |
| CN114045365B (en) * | 2021-10-09 | 2022-11-18 | 西宁特殊钢股份有限公司 | Steel slag treatment process and application of obtained tailings |
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Application publication date: 20200623 |