CN114150109B - Process for harmlessly converting desiliconized dephosphorized slag of converter and secondary aluminum ash in cooperation with chromium slag - Google Patents
Process for harmlessly converting desiliconized dephosphorized slag of converter and secondary aluminum ash in cooperation with chromium slag Download PDFInfo
- Publication number
- CN114150109B CN114150109B CN202111516282.7A CN202111516282A CN114150109B CN 114150109 B CN114150109 B CN 114150109B CN 202111516282 A CN202111516282 A CN 202111516282A CN 114150109 B CN114150109 B CN 114150109B
- Authority
- CN
- China
- Prior art keywords
- slag
- chromium
- aluminum ash
- converter
- secondary aluminum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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
Abstract
The invention discloses a process for harmlessly converting converter desiliconized dephosphorized slag and secondary aluminum ash into chromium slag, which is implemented according to the following steps: 1. processing the chromium slag to 70-200 meshes, and carrying out pulling transportation on the chromium slag to a high-pressure dry powder pelletizer production line for later use; 2. crushing the secondary aluminum ash to 70 meshes, and carrying out pulling on the secondary aluminum ash to a high-pressure dry powder pelletizer production line for later use; 3. the method comprises the following steps of (1) producing the chromium slag and the secondary aluminum ash on a high-pressure dry powder ball press according to the mass ratio of 6 to 4 into pellets with the particle size of 15-30 mm, and carrying the pellets to a converter production line for later use; 4. and (3) carrying out double-slag operation of the converter, pouring the desiliconized dephosphorized slag, and adding the pellets into a slag pot, wherein the adding amount is as follows: 100-150 kg of steel slag is added into each ton of steel slag; 5. according to the traditional treatment process of the steel slag, the steel slag is treated without changing the original treatment process of the steel slag.
Description
Technical Field
The invention relates to a process for harmlessly converting desiliconized dephosphorized slag of a converter and secondary aluminum ash in cooperation with chromium slag.
Background
Aluminum ash is a solid mass containing metallic aluminum and other constituents produced during the production or use and recovery of electrolytic aluminum, cast aluminum and other aluminum industries. The basic ranges of the main components and the contents (mass percent) thereof in the primary aluminum ash are as follows: 10 to 30 percent of metallic aluminum; 7 to 20 percent of aluminum nitride; 20% -40% of alumina; the content of silicon dioxide, magnesium oxide and ferric oxide is 3-15%; the chlorides of alkali metals of potassium, sodium, calcium and magnesium and other trace fluorides contain 15-30%.
After the aluminum ash is sieved or fried, the residual aluminum ash after the metal aluminum in most of the aluminum ash is extracted is called secondary aluminum ash, the secondary aluminum ash contains about 5 percent of metal aluminum and 7 to 20 percent of aluminum nitride, the content of aluminum oxide is over 40 percent, and the secondary aluminum ash contains soluble fluoride and chloride. The national list of hazardous waste (2021 edition) has now listed secondary aluminum ash as a hazardous waste, where the definitions in the list are: (1) Aluminum ash slag generated on the surface of a melt in the processes of transferring, refining, alloying and casting of HW321-024-48 electrolytic aluminum liquid, and salt slag and secondary aluminum ash generated in the aluminum recovery process; (2) During the processing of the HW321-026-48 recycled aluminum and aluminum materials, aluminum ash slag generated on the surfaces of remelting, refining, alloying and casting melts of waste aluminum and aluminum ingots, and salt slag and secondary aluminum ash generated during the aluminum recovery process.
In reference to literature (1), li ling, yuan song ming and yuan qiang in journal of inorganic salt industry, 8 th 2018, a thesis entitled "research progress on recycling of aluminum ash" is published, and in the literature, in order to solve the problem that untreated aluminum ash causes severe environmental pollution, analysis indicates, in combination with the characteristics of the current technology: the wet method has more advantages in secondary aluminum ash recovery treatment compared with the fire method, and the recovery of gas generated in the process of treating aluminum ash and aluminum ash by the fire method without salt is a research hotspot in the future. The aluminum ash can be used as a raw material for producing refractory materials, building materials and environmental materials. The heterogeneity among the aluminum ashes determines the content expression of a comprehensive treatment method of the system required by the aluminum ash treatment; (2) Li Yuan soldiers, sun Li et al published a paper entitled "comprehensive utilization of aluminum ash" in journal of "China nonferrous metallurgy" at 2008 th 6, and there is a paper that "aluminum ash contains many substances which can cause direct or indirect harm to the environment, and the direct disposal of the substances can cause environmental pollution. The aluminum ash is a renewable resource with comprehensive utilization value, and can recover aluminum, salt and aluminum oxide from the aluminum ash, synthesize a water purifying agent, and be used for refractory materials, road and building materials, steel-making desulfurizing agents and the like. The recycling method of the aluminum ash is multiple, and the aluminum ash is comprehensively treated as much as possible according to actual conditions and is selected according to the principles of high recovery rate, higher economic benefit and no secondary pollution. "is expressed in terms of the content.
The above documents do not mention a process using secondary aluminium ash and converter desilication slag in conjunction with chromium slag for harmless conversion.
The chromium slag is the residue produced by mixing chromite, soda ash and calcium filler according to a certain proportion, calcining at high temperature and leaching sodium chromate with water in the production process of chromium salt. The harmful components in the chromium slag are hexavalent chromium (Cr), such as soluble sodium chromate, acid-soluble calcium chromate, etc 6+ ) The ions are harmful to the digestive tract, respiratory tract, skin and mucous membrane of human body, even are carcinogenic. Therefore, the chromium slag is listed as national hazardous waste by national administrative departments such as the original national environmental protection Bureau and the like;
in reference to literature (1), xiaoyu, jiang dalong published a paper entitled "research on technology for cooperatively treating chromium slag by using a metallurgical sintering furnace and a blast furnace" in 2012, volume 35, university of Chongqing, which includes: aiming at the imperfect current chromium slag treatment method, a technology and a process method for cooperatively treating chromium slag by using a sintering furnace and a blast furnace are developed, and the content expression of complete detoxification treatment and resource utilization of the chromium slag is realized by using the small environment of reducing atmosphere of numerous small ball cores on the premise of not changing the process of the sintering furnace and the blast furnace; (2) A paper entitled "raw material proportioning test for smelting chromium iron without calcium chromium slag" is published in journal of ferroalloy of 2016, namely royal glossy privet, yuanwang, yunyujun and the like, and a gansu brocade chemical industry finite responsibility company is a chemical enterprise which takes chromium salt as a main product and synchronously produces a plurality of byproducts. Is also a chemical enterprise for producing chromium salt by using a calcium-free roasting process in China. The method for simultaneously treating chromium slag and vanadium slag has been successfully found in production practice, namely, blue carbon is used as a reducing agent, and vanadium slag and silica are used as a flux to reduce the chromium slag to produce chromium-containing cast iron. The method solves the problem of fine slag treatment to a certain extent and obtains better economic benefit.
As can be seen from the above literature introduction, the above literature also does not mention the process method of utilizing secondary aluminum ash and converter desilication slag to cooperate with chromium slag for harmless conversion.
The converter steelmaking adopts a double-slag smelting process, which is an innovative technology in the steel industry in the last decade. The double-slag smelting process is characterized in that after smelting is finished, decarburization slag is left in a converter to be used as desiliconization and dephosphorization slag of the next furnace, after desiliconization and dephosphorization are finished, the desiliconization and dephosphorization slag is poured out, then slag auxiliary materials are added for decarburization operation, and slag is left after tapping and enters the circulation of the next furnace. The desiliconized dephosphorized slag produced by the process has the following characteristics:
(1) The basicity (binary basicity) of the slag of a conventional converter is more than 2.8, the basicity of the desiliconized dephosphorized slag is between 1.4 and 2.2, the content of free calcium oxide in the slag is low, the slag contains a large amount of multiflower hectorite and olivine, the crushing value and the strength of the slag are lower than those of the decarburized chromium slag of the converter, and the components of the typical desiliconized dephosphorized slag are shown as follows:
(2) The total iron content in the slag is below 15%, and the slag contains more small metallic iron beads dispersed in the steel slag, and the wear resistance value of the slag is lower than the requirement of a road material.
Disclosure of Invention
The invention aims to provide a process for harmlessly converting desiliconized dephosphorized slag and secondary aluminum ash of a converter in cooperation with chromium slag, which can realize harmless conversion of the aluminum ash and the chromium slag and improve the resource utilization quality of converter smelting tailings.
The technical scheme adopted by the invention is as follows: a process for harmlessly treating converter desiliconized dephosphorized slag and secondary aluminum ash in cooperation with chromium slag is implemented according to the following steps: 1. processing the chromium slag to 70-200 meshes, and carrying out pull transportation on the chromium slag to a high-pressure dry powder pelletizer production line for later use; 2. crushing the secondary aluminum ash to 70 meshes, and carrying out pulling on the secondary aluminum ash to a high-pressure dry powder pelletizer production line for later use; 3. the method comprises the following steps of (1) producing the chromium slag and the secondary aluminum ash on a high-pressure dry powder ball press according to the mass ratio of 6 to 4 into pellets with the particle size of 15-30 mm, and carrying the pellets to a converter production line for later use; 4. and (3) carrying out double-slag operation of the converter, pouring the desiliconized dephosphorized slag, and adding the pellets into a slag pot, wherein the adding amount is as follows: adding 100-150 kg of steel slag into each ton of steel slag; 5. according to the traditional treatment process of the steel slag, the steel slag is treated without changing the original treatment process of the steel slag.
The invention discovers the following innovation points through research and experiments:
1) The chromium slag can react with metal aluminum and aluminum nitride in the aluminum ash at about 1200 ℃, and the process aim of detoxifying the chromium slag is achieved, wherein the main chemical reaction is as follows:
2) The chromium slag can react with C and Si in small iron beads in the desiliconization and dephosphorization slag at about 1200 ℃ to achieve the process aim of detoxifying the chromium slag, wherein the main chemical reaction is as follows:
3) The inventor finds that MgO, feO and the like in the dephosphorization and desilication slag can participate in detoxification, and the generated partial chromium oxide can continuously react with the slag to form mineral phases such as magnesia-chromite spinel, magnesia-alumina spinel, ferrochrome spinel and the like, so that the hardness of the dephosphorization and desilication slag is improved, and the subsequent resource utilization is facilitated, wherein the main reaction is as follows:
4) The soluble fluoride (sodium fluoride, sodium fluoroaluminate, potassium fluoride and the like) in the aluminum ash can be dissociated into F ions and alkali metal oxygen ions in the liquid desiliconization dephosphorization slag, the melting point of the slag is reduced in the liquid steel slag, and the fluidity of the slag is improved;
5) And the aluminum nitride in the aluminum ash can react with MnO in the slag at 860 ℃ and can react with chromate at 1120 ℃, so that the chromium slag is detoxified, the amount of metal materials in the converter desiliconized dephosphorization slag is increased, the metal materials are recycled, and the smelting cost is reduced.
6) The invention detoxifies the chromium slag, increases the alkalinity of the slag by alkali metal in the chromium slag, forms most mineral phases of solid solution and spinel phase, improves the hardness of the steel slag, and is beneficial to the resource utilization of the steel slag in road construction and building material production.
7) Chloride in the aluminum ash can form Ca with low melting point in the desiliconized dephosphorized slag 3 OCl 4 The mineral phase becomes a part of the steel slag, and the purpose of ore formation and storage of chloride can be realized.
The invention aims to solve the problem of low crushing value when desiliconized dephosphorized slag is applied to road construction while detoxifying chromium slag by utilizing the metallic iron in the desulfurized slag and slag thereof and adding reducing agent carbon. Compared with the traditional chromium slag detoxification process, the method can realize the harmless treatment of the chromium slag and the secondary aluminum ash simultaneously, and realize the resource utilization of the chromium slag and the secondary aluminum ash. The detoxification process provided by the invention can improve the hardness and strength of the slag while completing harmless conversion of hazardous wastes, and is beneficial to resource utilization of the steel slag in the road construction and building material production processes.
Detailed Description
The implementation of the invention is illustrated by taking a 150-ton converter production line and a process taking slag remaining operation as a main example, and the process for harmlessly converting the converter desiliconized dephosphorized slag and the secondary aluminum ash in cooperation with the chromium slag is implemented according to the following steps:
1. processing the chromium slag to 70-200 meshes, and carrying out pulling transportation on the chromium slag to a high-pressure dry powder pelletizer production line for later use;
2. crushing the secondary aluminum ash to 70 meshes, and carrying out pulling and conveying to a high-pressure dry powder pelletizer production line for later use;
3. the method comprises the following steps of (1) producing the chromium slag and the secondary aluminum ash on a high-pressure dry powder ball press according to the mass ratio of 6 to 4 into pellets with the particle size of 15-30 mm, and carrying the pellets to a converter production line for later use;
4. and (3) carrying out double-slag operation of the converter, pouring the desiliconized dephosphorized slag, and adding the pellets into a slag pot, wherein the adding amount is as follows: adding 100-150 kg of steel slag into each ton of steel slag;
5. according to the traditional treatment process of the steel slag, the steel slag is treated without changing the original treatment process of the steel slag.
The invention relates to three fields of converter desiliconization and dephosphorization slag, chromium slag and electrolytic aluminum hazardous waste aluminum ash harmless treatment technology. The invention utilizes metallic aluminum and aluminum nitride in aluminum ash, small iron liquid particles in converter desilication slag as a reducing agent, al2O3 in the aluminum ash and SiO2 in the desilication and dephosphorization slag as main acidic substances, and utilizes the reducing agent to reduce 6-valent chromium in chromium slag into metallic chromium and trivalent chromium on the basis of thermodynamic reaction by taking the heat of the desilication slag as the basis, wherein the trivalent chromium can also produce ferrochrome spinel phase and magnesia-chrome spinel phase with iron oxide and magnesium oxide in slag, calcium salt and sodium salt in chromium slag and acidic substances in aluminum ash and desilication slag produce calcium silicate, calcium aluminate, calcium sodium aluminate and sodium silicate mineral phases.
Claims (1)
1. A process for harmlessly treating converter desiliconized dephosphorized slag and secondary aluminum ash in cooperation with chromium slag is characterized by comprising the following steps of:
1) Processing the chromium slag to 70-200 meshes, and carrying out pull transportation on the chromium slag to a high-pressure dry powder pelletizer production line for later use;
2) Crushing the secondary aluminum ash to 70 meshes, and carrying out drawing and conveying to a high-pressure dry powder pelletizer production line for later use;
3) The chromium slag and the secondary aluminum ash are produced into pellets with the particle size of 15-30 mm on a high-pressure dry powder ball press machine according to the mass ratio of 6;
4) And in the converter double-slag operation, the pellets are added into a slag pot while pouring out the desiliconized dephosphorization slag, wherein the adding amount is as follows: 100-150 kg of steel slag is added into each ton of steel slag;
5) According to the traditional treatment process of the steel slag, the steel slag is treated without changing the original treatment process of the steel slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111516282.7A CN114150109B (en) | 2021-12-13 | 2021-12-13 | Process for harmlessly converting desiliconized dephosphorized slag of converter and secondary aluminum ash in cooperation with chromium slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111516282.7A CN114150109B (en) | 2021-12-13 | 2021-12-13 | Process for harmlessly converting desiliconized dephosphorized slag of converter and secondary aluminum ash in cooperation with chromium slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114150109A CN114150109A (en) | 2022-03-08 |
| CN114150109B true CN114150109B (en) | 2023-02-07 |
Family
ID=80450983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111516282.7A Active CN114150109B (en) | 2021-12-13 | 2021-12-13 | Process for harmlessly converting desiliconized dephosphorized slag of converter and secondary aluminum ash in cooperation with chromium slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114150109B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114774626B (en) * | 2022-04-05 | 2023-04-07 | 王强 | Method for producing steelmaking slagging refining agent by using etching waste residues |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001316712A (en) * | 2000-05-02 | 2001-11-16 | Nippon Steel Corp | Method for recovering chromium from chromium containing slag |
| CN101721784B (en) * | 2008-10-21 | 2011-12-21 | 宝山钢铁股份有限公司 | Harm-free and recycling treatment method for chromium slag |
-
2021
- 2021-12-13 CN CN202111516282.7A patent/CN114150109B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114150109A (en) | 2022-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102264919B (en) | Method for reclaiming iron and phosphorus from steelmaking slag | |
| CN109022644B (en) | Method for recovering slag desulfurization and dephosphorization in cooperation with ferrite in full-three-removal process | |
| CA2842587C (en) | Method for the production and the purification of molten calcium aluminate using contaminated aluminum dross residue | |
| RU2226220C2 (en) | Steelmaking slag reprocessing method | |
| JP6064341B2 (en) | How to remove sulfur from desulfurized slag | |
| CN111235354B (en) | Production process of LF multifunctional deoxidation submerged arc slag | |
| CN114150109B (en) | Process for harmlessly converting desiliconized dephosphorized slag of converter and secondary aluminum ash in cooperation with chromium slag | |
| US20130305882A1 (en) | Titanium-containing molded body | |
| CN113122680B (en) | Steel slag modifier and preparation and use methods thereof | |
| CN111139332B (en) | Slag former and light and thin scrap steel mixed processing furnace entering process | |
| CN107858476B (en) | Composite slag modifier for converter steelmaking | |
| CN115710634A (en) | Method for treating sintering dust removal ash and waste coating of continuous casting tundish | |
| JP5341849B2 (en) | Manufacturing method of recycled slag | |
| CN115386685B (en) | Harmless treatment method for converter production synergistic chromium slag and electrolytic aluminum carbon slag | |
| CA2398349A1 (en) | Method for reprocessing dust or dust mixtures | |
| CN111534661B (en) | High-magnesium vanadium slag pretreatment method based on magnesium roasting | |
| CN105039616A (en) | Coprocessing method for AOD stainless steel residues stored in piles and LF refining residues | |
| JP2013189688A (en) | Method for removing sulfur from desulfurization slag | |
| US3942977A (en) | Process for making iron or steel utilizing lithium containing material as auxiliary slag formers | |
| FI64648B (en) | FOERFARANDE FOER UTNYTTJANDE AV FATTIGA OXIDISKA OCH JAERNHALTIGA KOMPLEXMALMER ELLER -KONCENTRAT | |
| CN114058861B (en) | Method for harmlessly transforming chromium slag by using blowing desulfurization process | |
| JP2001234226A (en) | Method for treating refining slag for molten stainless steel | |
| CN103667579A (en) | Iron adding process-based medium-high silicon molten iron desilication method | |
| JPH04224147A (en) | Manufacture of raw material for ultra high-speed-hardening cement reforming slag | |
| JPH1171611A (en) | Lime flux for smelting metal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |