CN115612837A - Method for cooperatively treating ironmaking gas ash by utilizing steelmaking refining slag - Google Patents

Method for cooperatively treating ironmaking gas ash by utilizing steelmaking refining slag Download PDF

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CN115612837A
CN115612837A CN202211381208.3A CN202211381208A CN115612837A CN 115612837 A CN115612837 A CN 115612837A CN 202211381208 A CN202211381208 A CN 202211381208A CN 115612837 A CN115612837 A CN 115612837A
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slag
pellets
refining slag
gas ash
refining
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***
王强
俞海明
陈大伟
刘仁博
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Xinyuan Zhabao Environmental Protection Technology Co ltd
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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
    • 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
    • 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
    • C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
    • 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
    • C22B13/00—Obtaining lead
    • C22B13/02—Obtaining lead by dry processes
    • C22B13/025—Recovery from waste materials
    • 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
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/20—Obtaining zinc otherwise than by distilling
    • 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
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/02—Working-up flue dust
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The invention discloses a method for cooperatively treating ironmaking gas ash by utilizing steelmaking refining slag, which comprises the following implementation steps: 1) And the iron-making gas ash and borax are mixed according to the ratio of 95:5, uniformly mixing the materials in percentage by mass, pressing the materials into pellets of about 50mm by a high-pressure ball press at one time, drying and dehydrating the pellets, and then conveying the pellets to a refining slag deslagging process point for later use; 2) Adding the pellets into an empty refining slag tank, and then pouring the residual molten steel of the refining slag into the slag tank; wherein the adding amount of the pellets is equal to the slag amount of the refining slag, namely 1kg of the gas ash pellets is added into 1kg of the refining slag, and the amount of the residual molten steel is not considered; 3) After the operation is finished, the slag pot is transported to a hot splashing slag site of the converter to be kept stand for 6 hours, then the slag pot is turned over, the hot splashing slag is processed according to the technological process, heavy metal raw materials recovered by screening and magnetic separation are used as metallurgical raw materials for resource utilization, and tailings and converter slag are integrally used as resources according to the resource utilization mode of the converter slag.

Description

Method for cooperatively treating ironmaking gas ash by utilizing steelmaking refining slag
Technical Field
The invention relates to a method for cooperatively treating ironmaking gas ash by utilizing steelmaking refining slag.
Background
The blast furnace gas mud is a product obtained by wet dedusting of raw material dust carried along with blast furnace gas and particles generated by violent reaction in a high-temperature region in the blast furnace smelting process. The blast furnace gas mud is used as a byproduct in the steel industry, and the main components of the blast furnace gas mud are iron and carbon, namely iron ore powder and coke powder blown from the top of a furnace, wherein the iron content is about 30 percent, and the carbon content is about 20 percent. Meanwhile, as part of the iron ore used by the blast furnace contains a certain amount of nonferrous metals, some nonferrous metals with low boiling point enter the blast furnace gas after volatilizing in the blast furnace, and are finally enriched in gas mud in the form of oxides. Eight iron and Steel works Ltd in Xinjiang 2500m 3 The composition of the blast furnace gas ash of (a) is given in the following table:
Figure DEST_PATH_IMAGE001
the resource utilization process of blast furnace gas ash is characterized by that it adopts the construction of rotary hearth furnace and shaft furnace, and after the nonferrous metal and alkali metal potassium and sodium are removed from the gas ash, the residual iron-containing pellets can be returned into iron-smelting process to implement resource utilization. In addition, no effective process method for effectively treating the blast furnace gas ash in full quantity exists at present.
In the review of literature (1), a paper entitled "research status on recycling of blast furnace gas mud (ash)" is published in journal of mining industry prompter of 2007 5 th stage by Liu inhering the State Pengjinhui Zhang Libo et al, and in 1976, the United states Environmental Protection Agency (EPA) sets up laws, classifies steel and iron plant dust containing lead and zinc into K061 substances (toxic solid wastes), and requires recovery or passivation treatment of lead, zinc and the like, otherwise, the dust needs to be hermetically stacked in a designated place. "is expressed in terms of content; (2) A paper entitled "research on mixed injection of blast furnace gas ash and pulverized coal" was published in journal of "chinese metallurgy" of 5 th stage of 2007 by jamaici, zhangpropylhua, and there is a paper "blast furnace gas ash is one of byproducts generated in a blast furnace smelting process, and contains a large amount of beneficial iron and carbon. At present, some foreign iron and steel enterprises adopt a landfill mode to treat the iron and steel enterprises, and basically adopt a treatment mode of returning to sintering and re-agglomeration at home. The method is a very potential technology for utilizing blast furnace gas ash by mixing the coal ash with the pulverized coal and then spraying the mixture into the blast furnace from a tuyere. The mixed blowing can not only effectively utilize useful substances in the ash, but also achieve the aims of reducing the coke ratio, improving the yield and facilitating the stable and smooth operation of the furnace condition.
According to the above description, no technical method for treating ironmaking gas ash by utilizing refining slag has been provided so far.
The molten steel refining slag is reductive slag produced in the molten steel refining process in the steelmaking process, and the ton steel yield is between 7 and 15 kg. The refining slag for steelmaking is steel slag with extremely special properties, the content of FeO and MnO in the slag is lower than 2%, f-CaO in the slag is far higher than that of converter steel slag, and the properties of the slag are greatly different from those of the converter steel slag. One of the remarkable characteristics of the refining slag is that when the steel slag is cooled to room temperature, part of the refining slag can be pulverized, and the formed white powder has great influence on environmental pollution.
In the review of the literature (1), ningxue, liliaosha published a paper entitled "resource utilization characteristics of LF furnace refining slag" in 2009, 4 th journal of Anhui Industrial university, which includes "w (Al) in general LF furnace refining slag 2 O 3 ) And the equivalent to low-grade bauxite, namely 20 to 40 percent. The slag phase of the common LF slag is composed of calcium-aluminum and silico-calcium complex phases, and has a value of recycling in metallurgical production. In recent years, researches on the extensive utilization of common LF slag are gradually developed, for example, the LF slag is recycled by utilizing the residual heat in a molten state, but the availability and the economy of the slag are weak, and the utilization method is established on the basis of smelting the same steel and has a narrow application range. The premelted LF furnace refining slag (also called calcium aluminate) has the characteristics of uniform components, low melting point, high melting speed, short refining time, no fluorine content and the like, and is more and more emphasized, but the utilization of the slag only remains in the process exploration, the research on high added value and fine utilization is rarely reported, and the slag is difficult to be efficiently and comprehensively utilized. Therefore, it is necessary to develop the recycling characteristics of the slag system And corresponding research provides reference for realizing efficient and reasonable utilization of the resources. "is expressed in terms of content; (2) Wang changxin, tang li dong mo, zhao zhi hong, xu chong was published in journal of Shandong Metallurgical of No. 4 of 2007, a paper entitled "refining slag recycling technical analysis", which is included in the text: in order to realize the recycling of the refining slag, the components of the refining slag sample, the desulfurization capability of the refining slag, the influence of the refining slag on the production process in the recycling process and the like are respectively analyzed. The result shows that the refining slag is circulated for less than 3 times, the desulfuration of the slag and the air permeability of a steel ladle are not influenced, and the silicon and phosphorus return of the molten steel is not caused. The content of the utilization rate of refining slag of the current economic steel third steel plant is 45 percent.
In conclusion, no technological method for cooperatively treating blast furnace gas ash by utilizing the thermal refining slag exists.
Disclosure of Invention
The invention aims to provide a method for cooperatively treating iron-making gas ash by utilizing steelmaking refining slag, which utilizes the characteristics of high-temperature refining slag to cooperatively treat the iron-making gas ash and recover heavy metal elements such As iron element, zinc element, lead element and the like in the gas ash, is used in the field of metallurgy, realizes harmless conversion of harmful substances such As As and the like in the gas ash by utilizing a steel slag thermal coupling technology, simultaneously eliminates the problem of pulverization pollution of the refining slag, can be used As building materials and road materials for resource utilization after eliminating the potential risk of high f-CaO content in the refining slag, realizes the utilization of heat energy of the high-temperature refining slag and the full resource utilization of the iron-making gas ash, and has great economic benefit and environmental protection benefit.
The invention adopts the technical scheme that a method for cooperatively treating ironmaking gas ash by utilizing steelmaking refining slag comprises the following implementation steps:
1) And the iron-making gas ash and borax are mixed according to the ratio of 95:5, uniformly mixing, pressing into pellets of about 50mm by a high-pressure ball press, drying, dehydrating, and then transporting to a refining slag deslagging process point for later use;
2) And adding the pellets into an empty refining slag tank, and pouring the residual molten steel of the refining slag into the slag tank. Wherein the adding amount of the pellets is equal to the slag amount of the refining slag, namely 1kg of the gas ash pellets is added into 1kg of the refining slag, and the amount of the residual molten steel is not considered;
3) After the operation is finished, the slag pot is transported to a hot splashing slag site of the converter to be kept stand for 6 hours, then the slag pot is turned over, the hot splashing slag is processed according to the technological process, heavy metal raw materials recovered by screening and magnetic separation are used as metallurgical raw materials for resource utilization, and tailings and converter slag are integrally used as resources according to the resource utilization mode of the converter slag.
The innovation points of the invention are as follows:
1. the inventor finds that the temperature of the molten steel refining slag after being poured into the slag pot is about 1450 ℃, a small amount of molten steel remains in a ladle after the ladle is poured due to the existence of the refining slag after the molten steel is refined, and the molten steel and the refining slag are poured into the refining slag pot together, and the refining slag contains part of residual casting molten steel; the inventor utilizes the characteristic that the heat energy and the material composition characteristic of the residual molten steel and the refining slag are utilized to reduce the ironmaking gas ash, and the heavy metal elements in the ironmaking gas ash are recycled as the metallurgical raw materials for resource utilization. Typical chemical reactions are of the following two general classes:
The first type is: self-reduction reaction between components in ironmaking gas ash
ZnO·Fe 2 O 3 +4C=Zn+2Fe+4CO
Fe 2 O 3 +3C=2Fe+3CO
Fe 3 0 4 +4C=3Fe+4C0
Pb0+C=Pb+CO
The second type: reaction between the residual molten steel and the ironmaking gas ash pellets:
ZnO·Fe 2 O 3 +2[Si]=Zn+2Fe+2SiO 2
ZnO·Fe 2 O 3 +4[C]=Zn+2Fe+4CO
Fe 2 O 3 +3[C]=2Fe+3CO
2Fe 2 O 3 +3[Si] =4Fe+3SiO 2
Fe 3 0 4 +2[Si] =3Fe+2SiO 2
Pb0+[C] =Pb+CO
2Pb0+[Si] =2Pb+ SiO 2
2. adding borax powder serving as a binder into ironmaking gas ash, pelletizing the ironmaking gas ash, dewatering the pellets, adding the pellets into an empty slag tank for refining slag, pouring the pellets into the refining slag for casting residue, reducing and recovering heavy metal in the ironmaking gas ash by using the casting residue refining slag, and performing solid fusion on boron element in the binder into dicalcium silicate mineral phase in the refining slag, so that pulverization caused by phase change of dicalcium silicate is avoided, the pollution problem of the refining slag is eliminated, and the subsequent process operation for recovering the heavy metal element is facilitated;
3. the sulfide in the refining slag is utilized to react with the minerals in the ironmaking gas ash to convert As into calcium arsenate, and the calcium arsenate is formed and sealed in the resource utilization process, so that harmless conversion is realized.
4. SiO in ironmaking gas ash 2 、Fe 2 O 3 And the substances can react with the f-CaO in the refining slag, so that the potential hidden danger in the resource utilization process of the refining slag is eliminated, wherein the typical reaction is as follows:
2f-CaO+SiO 2 =2CaO·SiO 2
2f-CaO+ Fe 2 O 3 =2CaO·Fe 2 O 3
5. after the slag tank is filled with the refining slag and left for casting, the slag tank is kept stand for 6 hours, and then the heavy metal elements are recovered according to the hot slag splashing process of the converter steel slag and are recycled as metallurgical raw materials.
The beneficial contributions of the present invention are as follows: 1. the production of iron-making gas ash per ton of iron is about 15kg, and the resource utilization problem of the iron-making gas ash can be fully solved by utilizing the process; 2. the invention utilizes the waste heat of the refining slag and the casting residual molten steel to calcine and reduce the ironmaking gas ash, saves the cost for constructing a rotary hearth furnace or a shaft kiln to treat the gas ash, saves the energy consumption in the treatment process, and reduces the CO which is discharged by heating gas or fuel and is specially used for treating the gas ash 2 The method is an important process means for reducing the total carbon emission of iron and steel enterprises; 3. the invention synchronously solves the problem of pulverization pollution of the refining slag while solving the problem of ironmaking gas ash, eliminates the problem of overhigh content of f-CaO in the refining slag, increases the safety of resource utilization of the refining slag and is beneficial to the resource utilization of the refining slag.
Detailed Description
The invention discloses a method for cooperatively treating ironmaking gas ash by utilizing steelmaking refining slag, which adopts the implementation process taking a 70-ton converter production line as an example as follows: the production line uses 8m 3 The casting weight of the steel casting material slag tank is 15 tons, the production amount of each ton of steel of the refining slag is 15kg, and the average temperature of the casting residue refining slag is 1450 ℃. The average production amount of the casting residual molten steel is 300 kg/furnace. The implementation steps are as follows:
1) And the ironmaking gas ash and the borax are mixed according to the ratio of 95:5, uniformly mixing the materials in percentage by mass, pressing the materials into pellets of about 50mm by a high-pressure ball press at one time, drying and dehydrating the pellets, and then conveying the pellets to a refining slag deslagging process point for later use;
2) And adding the pellets into an empty refining slag tank, and pouring the residual molten steel of the refining slag into the slag tank. Wherein the adding amount of the pellets is equal to the slag amount of the refining slag, namely 1kg of the gas ash pellets is added into 1kg of the refining slag, and the amount of the residual molten steel is not considered;
3) After the operation is finished, the slag pot is transported to a hot splashing slag site of the converter to be kept stand for 6 hours, then the slag pot is turned over, the hot splashing slag is processed according to the technological process, heavy metal raw materials recovered by screening and magnetic separation are used as metallurgical raw materials for resource utilization, and tailings and converter slag are integrally used as resources according to the resource utilization mode of the converter slag.

Claims (1)

1. A method for cooperatively treating ironmaking gas ash by utilizing steelmaking refining slag is characterized by comprising the following implementation steps:
1) And the iron-making gas ash and borax are mixed according to the ratio of 95:5, uniformly mixing the materials in percentage by mass, pressing the materials into pellets of about 50mm by a high-pressure ball press at one time, drying and dehydrating the pellets, and then conveying the pellets to a refining slag deslagging process point for later use;
2) Adding the pellets into an empty refining slag tank, and then pouring the refining slag into the slag tank to cast residual molten steel; wherein the adding amount of the pellets is equal to the slag amount of the refining slag, namely 1kg of the gas ash pellets is added into 1kg of the refining slag, and the amount of the residual molten steel is not considered;
3) After the operation is finished, the slag pot is transported to a hot splashing slag site of the converter to be kept stand for 6 hours, then the slag pot is turned over, the hot splashing slag is processed according to the technological process, heavy metal raw materials recovered by screening and magnetic separation are used as metallurgical raw materials for resource utilization, and tailings and converter slag are integrally used as resources according to the resource utilization mode of the converter slag.
CN202211381208.3A 2022-11-06 2022-11-06 Method for cooperatively treating ironmaking gas ash by utilizing steelmaking refining slag Pending CN115612837A (en)

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