CN112430745B - Slag adhering method for oxygen-enriched top-blown immersion smelting lead-smelting process spray gun - Google Patents
Slag adhering method for oxygen-enriched top-blown immersion smelting lead-smelting process spray gun Download PDFInfo
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- CN112430745B CN112430745B CN202011255181.4A CN202011255181A CN112430745B CN 112430745 B CN112430745 B CN 112430745B CN 202011255181 A CN202011255181 A CN 202011255181A CN 112430745 B CN112430745 B CN 112430745B
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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
- C22B13/00—Obtaining lead
- C22B13/02—Obtaining lead by dry 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
Abstract
The invention discloses a slag adhering method of a spray gun of an oxygen-enriched top-blown immersion lead smelting process, which comprises the steps of placing low-lead high-melting-point smelting slag in a melting furnace, heating to 1250-1400 ℃, and preserving heat for 30-60 minutes; inserting the spray gun into the molten pool and staying for 10-30 seconds; then lifting the spray gun to a position 100-500 cm above the liquid surface, and staying for 10-30 seconds to condense the wall hanging slag of the spray gun; repeating the same operation for 3-5 times to complete slag adhering; according to the method, heterogeneous slag is coated on the outer wall of the spray gun, and the strong corrosion effect of the high-lead slag on the spray gun in the oxygen-enriched top-blown immersion smelting lead-smelting process is reduced by utilizing the characteristics that the heterogeneous slag and the high-lead slag are similar in structure, high in melting point, high in viscosity, low in lead content and not easy to fall off in the smelting process, so that the purpose of prolonging the service life of the spray gun is achieved.
Description
Technical Field
The invention relates to a slag adhering method for a spray gun of an oxygen-enriched top-blown immersion lead smelting process, belonging to the technical field of nonferrous metallurgy.
Background
The top-blown immersion smelting process features that oxygen-enriched air is blown directly into the smelting furnace via a vertical lance inserted into the smelting bath for smelting. The spray gun is used as a core equipment component of the top-blown immersion smelting technology, and the service life of the spray gun directly influences the operating rate. Lead content in slag in the lead smelting process is high, temperature fluctuation is large, corrosion of the lead slag on a stainless steel spray gun is aggravated, and the service life of the spray gun is greatly shortened. The spray gun is invalid and can directly produce adverse effect to the smelting process, and frequent change spray gun can increase workman's working strength and spray gun maintenance cost by a wide margin, reduces smelting furnace productivity, increases manufacturing cost etc..
The patent with the publication number CN102747235B provides a 'three-step' slag adhering method for adhering slag to a spray gun, and the method forms a protective layer on the outer wall of the spray gun through adhering slag, so that the thermal action of high temperature to the spray gun is reduced, the corrosion behavior of lead slag to stainless steel is delayed, and the service life of the spray gun (head) is prolonged; the slag adhering is usually carried out by adopting homogeneous slag in industrial production; the furnace temperature fluctuation is large in the smelting process, the protection effect of the slag adhering layer on the spray gun is reduced, and the slag adhering layer is easy to melt and fall off.
In order to avoid frequent failure of the spray gun, the spray gun is protected by adopting a slag hanging mode of low-lead high-melting point heterogeneous slag on the outer wall of the spray gun, and the influence of high-lead slag corrosion on the service life of the spray gun in the smelting process is reduced.
Disclosure of Invention
In order to solve the problems that the spray gun of the oxygen-enriched top-blown immersion smelting lead-smelting process is short in service life, the spray gun is frequently replaced to influence the smelting process, and the production cost is increased, the invention provides a heterogeneous slag adhering method of the spray gun of the oxygen-enriched top-blown immersion smelting lead-smelting process, so that the corrosion of high lead slag to the spray gun in the oxygen-enriched top-blown immersion smelting lead-smelting process is reduced, and the service life of the spray gun is prolonged.
The technical scheme adopted by the invention for solving the technical problems is as follows: a slag adhering method for a spray gun of an oxygen-enriched top-blown immersion smelting lead-smelting process comprises the following steps:
(1) Heating heterogeneous slag (low-lead high-melting point slag, slag melting temperature not lower than 1250 ℃) to 1250-1400 ℃ in a melting furnace, and preserving heat for 30-60min to ensure that solid heterogeneous slag is heated and melted to form a molten pool.
(2) The spray gun is inserted into the molten pool and stays for 10-30 seconds, the spray gun is lifted to a position 100-500 cm above the liquid surface, and the spray gun stays for 10-30 seconds to condense the wall hanging slag of the spray gun.
(3) Repeating the step (2) for 3-5 times, wherein the insertion depth of the spray gun in the repeating process is consistent with that in the step (2), and completing slag adhering when the wall hanging slag of the spray gun is solidified; the use temperature of the spray gun after the completion of slag adhering is lower than the melting temperature of heterogeneous slag by more than 150 ℃.
Preferably, the content of Pb in the heterogeneous slag is less than 2wt.%, and Fe 3 O 4 Content greater than 15wt.%, fe/SiO 2 Greater than 2.
In the step 2 of the invention, the spray gun is made of corrosion-resistant stainless steel.
Compared with the prior art, the invention has the beneficial effects that:
by adopting the method, the slag adhering operation is simple, the melting point of the adhered heterogeneous slag is higher than the lead smelting temperature, and the viscosity of the heterogeneous slag is higher, so that the heterogeneous slag is not easy to melt and fall off in the lead smelting process, and the corrosion of the high-lead slag directly to the spray gun in the lead smelting process is slowed down; the main components of the heterogeneous slag and the high lead slag are silicate, so that a molten pool cannot be polluted by falling of a slag adhering layer; the method can effectively prolong the service life of the spray gun, reduce the replacement times of the spray gun and reduce the production and maintenance cost.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the scope of the present invention is not limited to the examples.
The slagging equipment and the smelting equipment used in the invention are two melting furnaces with the same performance and parameters, heterogeneous slag is used as slagging raw material, and high-lead slag is used as smelting slag raw material; the heterogeneous slag compositions used in the examples are shown in Table 1; the compositions of the high lead dross used in the examples are shown in Table 2.
TABLE 1 heterogeneous slag Main chemical composition
| Component | Pb | Fe(total) | Zn | Al 2 O 3 | SiO 2 |
| Content(wt.％) | 1.5 | 25.0 | 20.0 | 2.5 | 15.0 |
TABLE 2 main chemical composition of high lead slag
| Component | Pb | Fe(total) | Zn | Al 2 O 3 | SiO 2 |
| Content(wt.％) | 50.0 | 10.0 | 8.5 | 2.8 | 10.4 |
Example 1
The slag adhering and application in the smelting process of the embodiment of the invention comprise the following steps:
(1) Heterogeneous slag adhering
Placing a crucible filled with heterogeneous slag (below 60 meshes) in a melting furnace, setting a heating program, heating to 1400 ℃ at a heating rate of 10 ℃/min, and preserving heat for 40 minutes to melt the solid slag to form a molten pool; inserting a stainless steel spray gun with the length of 100 cm and the outer diameter of 1 cm into the molten pool, wherein the insertion depth is 5 cm, and the retention time is 10 seconds; then lifting the spray gun to a position 100 cm above the liquid surface and staying for 10 seconds to condense the wall hanging slag of the spray gun; the slag adhering operation is repeated for 3 times, and the thickness of the slag adhering layer after cooling is about 0.6 cm.
(2) Bath immersion blowing
Placing a crucible filled with high lead slag (below 60 meshes) into a melting furnace, setting a temperature rise program, raising the temperature to 1050 ℃ at a temperature rise rate of 10 ℃/min, and preserving the temperature for 30min to melt solid slag to form a molten pool; then inserting the spray gun with the slag into a molten pool, wherein the insertion depth is 5 cm, and the retention time is 120 minutes; lifting the spray gun to a position 100 cm above the liquid surface and staying for 10 minutes to cool the spray gun; at the moment, the wall-hung slag of the spray gun does not fall off, and the thickness of the wall-hung slag layer of the spray gun is reduced by about 0.04 cm; the corrosion rate of the slag coating layer in the high lead slag for 120 minutes is 3.33 multiplied by 10 -4 The spray gun has the advantages that the stainless steel material of the spray gun is not obviously corroded in cm/min, the corrosion of high lead slag to the stainless steel is prevented due to the heterogeneous slag protective layer, and the service life of the spray gun is prolonged.
Example 2
(1) Heterogeneous slag adhering
Placing the crucible filled with heterogeneous slag (below 60 meshes) into a melting furnace, setting a temperature rise program, raising the temperature to 1400 ℃ at the temperature rise rate of 10 ℃/min, and preserving the temperature for 40 minutes to melt the solid slag to form a molten pool; inserting a stainless steel spray gun with the length of 100 cm and the outer diameter of 1 cm into the molten pool, wherein the insertion depth is 5 cm, and the retention time is 10 seconds; then lifting the spray gun to a position 100 cm above the liquid level and staying for 10 seconds to condense the wall hanging slag of the spray gun; the slag adhering operation is repeated for 5 times, and the thickness of the slag adhering layer after cooling is about 0.97 cm.
(2) Molten bath immersion blowing
Placing the crucible filled with the high lead slag (below 60 meshes) into a melting furnace, setting a temperature rise program, raising the temperature to 1050 ℃ at a temperature rise rate of 10 ℃/min, and preserving the temperature for 30min to melt the solid slag to form a molten pool; then inserting the spray gun with the slag into a molten pool, wherein the insertion depth is 5 cm, and the retention time is 120 minutes; lifting the spray gun to a position 100 cm above the liquid surface and staying for 10 minutes to cool the spray gun; at the moment, the slag on the wall of the spray gun does not fall off, and the thickness of the slag layer on the wall of the spray gun is reduced by about 0.035 cm; the corrosion rate of the slag coating layer in the high lead slag for 120 minutes is 2.92 multiplied by 10 -4 Centimeter per minute, no obvious corrosion and no foreign slag of the stainless steel material of the spray gunThe existence of the protective layer hinders the corrosion of the high lead slag to the stainless steel, and the service life of the spray gun is prolonged.
Claims (2)
1. A slag adhering method for a spray gun of an oxygen-enriched top-blown immersion smelting lead-smelting process is characterized by comprising the following steps: the method specifically comprises the following steps:
(1) Heating heterogeneous slag in a melting furnace to 1250-1400 ℃, and preserving heat for 30-60 minutes to melt solid heterogeneous slag to form a molten pool;
(2) Inserting the spray gun into the molten pool and staying for 10-30 seconds, lifting the spray gun to a position 100-500 cm above the liquid surface, and staying for 10-30 seconds to condense the wall hanging slag of the spray gun;
(3) Repeating the step (2) for 3-5 times, and cooling the wall hanging slag of the spray gun to finish the slag hanging;
the Pb content in the heterogeneous slag is less than 2wt.%, the Fe content is 25wt.%, the Zn content is 20wt.%, and the Al content in the heterogeneous slag is less than 2wt.% 2 O 3 Content 2.5wt.%, siO 2 The content was 15wt.%.
2. The slag adhering method for the oxygen-enriched top-blown immersion lead smelting process lance as claimed in claim 1, which is characterized in that: and (4) after the slag adhering in the step (3) is finished, the using temperature of the spray gun is lower than the melting temperature of heterogeneous slag by more than 150 ℃.
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| CN104928474A (en) * | 2015-07-08 | 2015-09-23 | 吉林吉恩镍业股份有限公司 | Method for prolonging service life of Ausmelt furnace spraying gun |
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| JP2000144272A (en) * | 1998-10-30 | 2000-05-26 | Sumitomo Metal Ind Ltd | Method for recovering chromium and iron in melting and smelting steel containing chromium |
| CN101176840B (en) * | 2006-11-09 | 2010-04-07 | 中国科学院生态环境研究中心 | Application method of iron modified red mud arsenic-removing adsorption agent |
| US9528766B2 (en) * | 2011-06-30 | 2016-12-27 | Outotec Oyj | Top submerged injecting lances |
| CN102747235B (en) * | 2012-07-31 | 2014-04-02 | 大冶有色金属有限责任公司 | Method for smelting and producing copper by spray gun adhering slag type Ausmelt furnace |
| CN102925921B (en) * | 2012-09-07 | 2015-09-16 | 昆明理工大学 | A kind of method strengthening Top-blown Lead Smelting |
| CN202786374U (en) * | 2012-09-07 | 2013-03-13 | 昆明理工大学 | Top-blown lead-smelting strengthening furnace device |
| CN105483393B (en) * | 2015-11-25 | 2017-11-21 | 中国恩菲工程技术有限公司 | A kind of method that reviver is handled using the side-blown fusion reducing furnace of modified |
| CN106929631B (en) * | 2017-04-25 | 2019-03-01 | 攀钢集团研究院有限公司 | The dross method that high-titanium blast furnace slag carbonization is smelted |
| CN107473332B (en) * | 2017-10-10 | 2020-09-04 | 中国地质大学（武汉） | Method for treating high-hardness high-arsenic underground water through ion exchange of Fe-based resin |
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| 顶吹熔炼炉中喷枪寿命的探讨;魏涛等;《科学技术与工程》;20091031;全文 * |
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