CN115652074A - Method for recovering iron element in sintering dedusting ash by utilizing magnetic agglomeration technology - Google Patents
Method for recovering iron element in sintering dedusting ash by utilizing magnetic agglomeration technology Download PDFInfo
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- CN115652074A CN115652074A CN202211468516.XA CN202211468516A CN115652074A CN 115652074 A CN115652074 A CN 115652074A CN 202211468516 A CN202211468516 A CN 202211468516A CN 115652074 A CN115652074 A CN 115652074A
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a method for recovering iron elements in sintering dust removal ash by utilizing a magnetic agglomeration technology. The iron-containing materials in the dedusting ash of the sintering process are recovered by magnetic separation by using the technology and are returned to iron and steel enterprises for cyclic utilization, and the residual tailings are used for resource utilization of nonferrous metallurgy raw materials, so that the method has important significance for high-efficiency resource utilization of the dedusting ash of the sintering process.
Description
Technical Field
The invention relates to two technical fields of steel slag treatment and resource utilization of fly ash in a sintering process, in particular to a method for recovering iron elements in sintering fly ash by using a magnetic agglomeration technology.
Background
The steel slag is solid waste in the steel-making process, and contains 18 to 35 percent of TFe. The iron element in the steel slag mainly comprises physical metallic iron (MFe), iron oxide and compounds (CaO. Fe) 2 O 3 、2CaO·Fe 2 O 3 ) Iron-aluminum solid solution Ca 2 O·(Al,Fe) 2 O 5 Magnetite (Fe) 3 O 4 ) RO phase (MgO. Fe) 2 O 3 ) And the like. The iron-containing materials in the steel slag are usually crushed, screened and magnetically separated in a steel slag crushing and magnetic separation production line, large slag steel and medium slag steel are recovered, then the steel slag is continuously crushed by a ball mill or a rod mill, and granular steel and ferrous magnetic substances with the granularity smaller than 1.5mm, such as iron granules, magnetite and RO, are recovered in the magnetic separation production line after crushing, wherein the iron-containing materials are called steel slag refined powder in the industry. The grade of the magnetically-separated steel slag refined powder in the industry at present is between 35% and 42%, the steel slag refined powder is usually returned to sintering for resource utilization, and some enterprises produce the steel slag refined powder into cold-bonded pellets to be returned to steel-making for resource utilization.
The article (1) with the strong money and published in journal of "sintering pellets" of 3 rd phase in 2018, entitled "application of low-grade steel slag magnetic separation powder in sintering process", is referred to, wherein the article contains "steel slag magnetic separation powder phase mainly comprising tricalcium silicate, and then ferrite phase, dicalcium silicate, magnesium ferrite and RO are equal; when 2% of steel slag magnetic separation powder is added for sintering to replace steel slag powder, the content of the grain size fraction of less than 3mm in the mixture is reduced by 4-5%, the improvement of the air permeability of a material layer is facilitated, and the change of the components of sintered ore is small; the phosphorus content in the steel slag magnetic separation powder is 0.3 percent less than that of the steel slag powder, and the phosphorus content in the sinter and the molten iron can be influenced although the steel slag magnetic separation powder is more favorable for sintering, so that the cycle number and the application range can only be limited. "is expressed in terms of content; (2) Weiying, lu Mai, limega published a paper entitled "comprehensive utilization test research of magnetic separation of converter steel slag" in the journal of silicate Notification of No. 1 of 2009, and the paper contains "the grades of magnetically-separated iron fine powder are all more than 50% under the 4 magnetic field strengths. However, from the viewpoint of the overall recovery rate, the magnetic field strength of the optimum magnetic separation fine iron powder is 0.175T when the fineness is 65%, the iron grade is 50.56% and the iron recovery rate is 64.19%. "is expressed in terms of content; according to the documents, a process method for applying steel slag magnetic separation fine powder to recovery of iron-containing materials in dedusting ash of a sintering process is not available.
The steel production in China is mainly based on the long flow of a blast furnace and a converter, and the sintered ore accounts for about 70-75% of the blast furnace burden. The amount of dust generated during sintering is about 1-2% of the total amount of the sintered ore. The dedusting ash generated in the sintering process is divided into two categories of process dedusting ash and environment dedusting ash, the content of harmful substances in the sintering environment dedusting ash is low, and the dedusting ash can be returned to a sintering plant for resource utilization, and the dedusting ash in the sintering process contains harmful substances and is not suitable for being returned to the sintering plant for resource utilization.
The dust removed in the sintering process is divided into two types, namely machine head dust removed and machine tail dust removed. The scale of the steel industry in China is huge, the sintering ingredients of different steel plants are different, the components of the generated sintering dedusting ash are different but basically similar, and the components of the sintering process ash of a certain plant in northwest China are shown in the following table:
as can be seen from the table above, the basic characteristic of the sintering process fly ash is that the contents of Pb, zn, K and Na are high, and the elements are harmful substances which influence the smooth operation of the blast furnace, so that the resource utilization of the sintering process fly ash is a difficult problem in the industry. According to a paper published by Tang Wei Jun, zhang Germany and Wu Guo Ping in the journal of modern mining industry in 2017, 9 th stage, entitled resource utilization technology of sintering machine head electro-precipitator dust, wherein valuable elements such as potassium, sodium, iron and chlorine in sintering machine head electro-precipitator dust are utilized to reduce solid waste pollution, on the basis of analyzing physical and chemical characteristics of the electro-precipitator dust and damage to sintering production, a novel technology for recycling potassium and sodium in sintering machine head precipitator dust is introduced, separation of potassium and sodium from heavy metals and iron elements is realized, iron-containing rich materials are returned to a sintering system, recovered potassium chloride products meet the requirements of first-class products and superior products of II-class products in the national standard GB6549-2011, the recovered potassium chloride products can be used as fertilizers, the recovery rate is over 90%, and the resource utilization rate is improved. "is expressed in terms of content; (2) A paper entitled "research on a horse steel high-potassium sintering dedusting ash potassium removal method" is published in journal of "sintering pellet" in 4 th stage of 2013 by jin Jun, zhang Xiao Ping, and Xia De Bo, and the paper introduces the utilization condition of the horse steel sintering dedusting ash, and through analyzing the physicochemical characteristics of the high-potassium sintering dedusting ash, from the perspective of economic and efficient potassium removal, the high-potassium dedusting ash potassium removal process with the water immersion temperature of 100 ℃, the liquid-solid ratio of 3. "is expressed in terms of content; (3) Kang Ling Chen, zhang, zhang Dahua in 2015 3 rd period "Industrial safety and environmental protection" journal published a paper entitled "treatment and utilization of sintering machine head dedusting ash", and there is a paper that "sintering machine head dedusting ash directly added to sintering material plays an important role in recovering iron resources therein, but there are many problems. For example, the quality of the sintering ore can be reduced by adding a large amount of sintering materials, elements such as potassium and lead in the dedusting ash enter the blast furnace along with the sintering ore and are easy to be enriched in the blast furnace, and the service life of the blast furnace is adversely affected, and long-term use of the dedusting ash in the sintering materials can easily cause enrichment of certain components in the dedusting ash in a dedusting system of the sintering machine, affect the dedusting efficiency of the whole dedusting system, and cause environmental pollution and resource loss. "is expressed in terms of content.
According to the documents, the technical field of recycling of the fly ash in the existing sintering process does not have a process method for recovering iron-containing materials in the fly ash in the sintering process by using a magnetic agglomeration technology.
Disclosure of Invention
The invention aims to provide a method for recovering iron elements in sintering fly ash by utilizing a magnetic agglomeration technology.
The technical scheme adopted by the invention is that the method for recovering the iron element in the sintering dust removal ash by utilizing the magnetic agglomeration technology is implemented according to the following steps:
1) The stockpiled sintering process fly ash is transported to a production line of crushing, ball milling or rod milling and magnetic separation for standby;
2) Mixing the steel slag fine powder with the sintering process dedusting ash according to the mass percent of 1-2;
3) The mixture processed by the rod mill is magnetically separated in a magnetic separation belt conveyor, the rotating speed of the belt conveyor is adjusted according to actual conditions in the magnetic separation process, and the rotating speed of a magnetic separation roller is determined according to the grade of magnetic separation fine powder at different rotating speeds;
4) And magnetically separating to obtain magnetic separation fine powder, returning the magnetic separation fine powder to iron and steel enterprises for resource utilization, and using the residual tailings as nonferrous metallurgy raw materials for resource utilization.
The main innovation points of the invention are as follows:
(1) The inventor finds small iron particles and magnetite (Fe) in the steel slag refined powder 3 O 4 ) The RO phase is a ferromagnetic material, and is influenced by an external magnetic field of the magnetic separation production line in the magnetic separation process of the steel slag magnetic separation production line, the ferromagnetic material in the steel slag fine powder has magnetism, is equivalent to a magnet (magnetic seed) containing N small particles and has the function of magnetic agglomeration, the inventor implements mixed processing of the steel slag fine powder and the dust removed by the sintering process according to the discovery, and in the processing process, a plurality of magnetic polymers are formed and grown by adsorbing iron-containing substances in the dust removed by the sintering process by using the magnetic seeds in the steel slag fine powder, and in the subsequent magnetic separation process, the separation of the magnetic polymers and the slag dust is realized by controlling the speed of a magnetic separation belt conveyor and using the difference between magnetic force and equipment mechanical force (also called competitive force, including the combined action of centrifugal force, gravity, friction force and the like) borne by materials, so as to achieve the purpose of recycling iron-containing raw materials;
(2) The inventor finds that the fly ash in the sintering process contains lead compounds which are strong oxidizers in the ball milling process and can convert paramagnetic alpha-Fe 2 O 3 Conversion to ferromagnetic gamma-Fe 2 O 3 And magnetically separated and recovered to reduce the TFe content in the tailings.
(3) In the processing process of a rod mill or a ball mill, the crystal boundary of calcium ferrite, calcium aluminoferrite and dicalcium silicate crystals can be damaged by the mechanochemical reaction effect, small iron particles and iron oxide which are dissolved in the above minerals are dissociated, a magnetomer is formed under the action of an additional magnetic seed, the magnetomer gradually grows up, the whole magnetism is enhanced, the separation of slag dust by iron-containing compounds is facilitated, and SiO in magnetic fine powder is reduced 2 The content of (b) is beneficial to resource utilization of iron making and steel making.
(4) The tailings left after magnetic separation can be used as cement production raw materials, potash fertilizer production raw materials and nonferrous metallurgy raw materials for resource utilization.
The beneficial contributions of the present invention are as follows: 1. by utilizing the magnetic agglomeration technology, the iron-containing materials in the fly ash of the sintering process can be recovered by a dry method, and the loss of iron elements of iron and steel enterprises is reduced; 2. the embodiment of Yili steel proves that the grade of the magnetically-separated fine powder magnetically separated from the fly ash in the sintering process by adopting the technology is over 62 percent, and SiO is 2 The content is controlled below 3.5 percent, and the material can be directly used as a sintering raw material for resource utilization, thereby having great economic benefit. 3. The magnetic agglomeration technology is utilized to efficiently recover iron-containing materials in the fly ash in the sintering process, and simultaneously, the mineral tissues adhered to the steel slag refined powder can be stripped, so that SiO in the magnetic separation refined powder is reduced 2 The content of the high-calcium-content fine slag is beneficial to the resource utilization of sintering production or steelmaking production, and the technical problem that low-grade steel slag fine powder is difficult to directly utilize as resources is solved. 4. After the iron-containing materials are recovered, the concentrations of K, pb and Zn in the dust removed by the sintering process are improved, and the subsequent step resource recycling is facilitated.
Detailed Description
The embodiment of the invention takes the dust removed by the sintering process stockpiled in a certain iron and steel enterprise as an example.
A method for recovering iron elements in sintering dust removal ash by using a magnetic agglomeration technology is implemented according to the following steps:
1) The stockpiled sintering process fly ash is transported to a production line of crushing, ball milling or rod milling and magnetic separation for standby;
2) Mixing the steel slag fine powder with the sintering process fly ash according to the mass percent of 1-2;
3) The mixture processed by the rod mill is subjected to magnetic separation in a magnetic separation belt conveyor, the rotating speed of the belt conveyor is adjusted according to actual conditions in the magnetic separation process, and the rotating speed of a magnetic separation roller is determined according to the grades of magnetic separation fine powder at different rotating speeds;
4) And magnetically separating to obtain magnetic separation fine powder, returning the magnetic separation fine powder to iron and steel enterprises for resource utilization, and using the residual tailings as non-ferrous metallurgy raw materials for resource utilization.
Claims (1)
1. A method for recovering iron elements in sintering dust by using a magnetic agglomeration technology is characterized by comprising the following steps:
1) The stockpiled sintering process fly ash is transported to a production line of crushing, ball milling or rod milling and magnetic separation for standby;
2) Mixing the steel slag fine powder with the sintering process dedusting ash according to the mass percent of 1-2;
3) The mixture processed by the rod mill is magnetically separated in a magnetic separation belt conveyor, the rotating speed of the belt conveyor is adjusted according to actual conditions in the magnetic separation process, and the rotating speed of a magnetic separation roller is determined according to the grade of magnetic separation fine powder at different rotating speeds;
4) And magnetically separating to obtain magnetic separation fine powder, returning the magnetic separation fine powder to iron and steel enterprises for resource utilization, and using the residual tailings as non-ferrous metallurgy raw materials for resource utilization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211468516.XA CN115652074A (en) | 2022-11-22 | 2022-11-22 | Method for recovering iron element in sintering dedusting ash by utilizing magnetic agglomeration technology |
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| CN202211468516.XA CN115652074A (en) | 2022-11-22 | 2022-11-22 | Method for recovering iron element in sintering dedusting ash by utilizing magnetic agglomeration technology |
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| CN115652074A true CN115652074A (en) | 2023-01-31 |
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| CN202211468516.XA Pending CN115652074A (en) | 2022-11-22 | 2022-11-22 | Method for recovering iron element in sintering dedusting ash by utilizing magnetic agglomeration technology |
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