CN117778742A - Method for efficiently recycling high-zinc-content refractory copper concentrate resources - Google Patents
Method for efficiently recycling high-zinc-content refractory copper concentrate resources Download PDFInfo
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- CN117778742A CN117778742A CN202311831063.7A CN202311831063A CN117778742A CN 117778742 A CN117778742 A CN 117778742A CN 202311831063 A CN202311831063 A CN 202311831063A CN 117778742 A CN117778742 A CN 117778742A
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- 239000010949 copper Substances 0.000 title claims abstract description 109
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 101
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000012141 concentrate Substances 0.000 title claims abstract description 38
- 238000004064 recycling Methods 0.000 title claims abstract description 8
- 238000003723 Smelting Methods 0.000 claims abstract description 100
- 239000002893 slag Substances 0.000 claims abstract description 92
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000011701 zinc Substances 0.000 claims abstract description 62
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 58
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000011787 zinc oxide Substances 0.000 claims abstract description 37
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000001301 oxygen Substances 0.000 claims abstract description 31
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 31
- 238000007664 blowing Methods 0.000 claims abstract description 26
- 239000003245 coal Substances 0.000 claims abstract description 24
- 239000000779 smoke Substances 0.000 claims abstract description 24
- 239000000428 dust Substances 0.000 claims abstract description 23
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003546 flue gas Substances 0.000 claims abstract description 8
- 230000001590 oxidative effect Effects 0.000 claims abstract description 7
- 239000010453 quartz Substances 0.000 claims abstract description 7
- 239000004575 stone Substances 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 11
- 239000000395 magnesium oxide Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 238000010583 slow cooling Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 239000007795 chemical reaction product Substances 0.000 claims description 2
- 239000003517 fume Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 239000007791 liquid phase Substances 0.000 description 9
- 235000012239 silicon dioxide Nutrition 0.000 description 7
- 238000010587 phase diagram Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- 238000009854 hydrometallurgy Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 3
- 239000005083 Zinc sulfide Substances 0.000 description 3
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical compound [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 229910052984 zinc sulfide Inorganic materials 0.000 description 3
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 3
- 239000012535 impurity Substances 0.000 description 2
- 229910052981 lead sulfide Inorganic materials 0.000 description 2
- 229940056932 lead sulfide Drugs 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- BWFPGXWASODCHM-UHFFFAOYSA-N copper monosulfide Chemical compound [Cu]=S BWFPGXWASODCHM-UHFFFAOYSA-N 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000009853 pyrometallurgy Methods 0.000 description 1
Classifications
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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
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for efficiently recycling difficult-to-treat high zinc-containing copper concentrate resources, which comprises the following steps: 1) Smelting: high zinc copper concentrate, quartz stone and coal are mixed according to Fe/SiO 2 After being mixed, the coal with the mass ratio of 1.6 to 2.0 and the coal rate of 1.5 to 5.0 percent is added into a side blowing furnace, and then oxygen enrichment is blown in, the temperature of a molten pool of the side blowing furnace is controlled to be more than or equal to 1350 ℃, copper smelting reaction is carried out, and copper matte with copper grade more than 70 percent, high zinc-copper smelting slag and smoke dust are generated; returning smoke dust to smelting; 2) Fuming: transferring the high zinc-copper-containing smelting slag into a fuming furnace, carrying out reduction fuming according to the coal rate of 15% -20%, blowing oxygen-enriched air, and controlling the oxygen excess coefficient of a molten pool to be 0.8-0.9 so as to enable zinc oxide in the smelting slagReducing into zinc vapor, oxidizing into zinc oxide in the flue gas, and enriching to obtain fuming slag and zinc oxide smoke dust. The method can treat copper concentrate with high zinc content and difficult treatment in a large scale, solves the problem of influence of high zinc content on the smelting process, and simultaneously efficiently recovers valuable metal zinc in the copper concentrate.
Description
Technical Field
The invention belongs to the technical field of nonferrous metal pyrometallurgy, and particularly relates to a method for efficiently recycling copper concentrate resources which contain high zinc and are difficult to treat.
Background
Copper is an important raw material for economic construction in China, and relates to various industries such as basic building property, automobiles, household appliances, new energy and the like. In 2022, the refined copper yield of China is 1106.3 ten thousand tons, and as the world-wide largest copper producing country, copper ore resources are relatively poor, only account for about 3% of the total world, and the resource endowment condition is poor, so that copper concentrate has great external dependence. Along with the development and utilization of copper ore resources, the rich ore quantity and copper grade of single metal are continuously reduced, and copper concentrate of copper smelting plants in China possibly faces the challenge of processing various refractory multi-metal mixed ores.
The copper concentrate is divided into five grades according to chemical components in China, and the grades meet the regulations of Table 1.
TABLE 1 grading of copper concentrate according to chemical composition
Besides the elements, the copper concentrate also contains more Fe, the content of which is more than 20 percent, cu, fe, zn, pb in the copper concentrate mainly exists in the form of sulfide phases, and the capability of the sulfide phases to combine with oxygen at high temperature is sequentially zinc sulfide > iron sulfide > lead sulfide > copper sulfide. In the smelting process, most of iron is oxidized and slagged into smelting slag, the smelting slag generally adopts iron-silicon binary slag, and under the premise of ensuring good fluidity of the smelting slag at about 1250 ℃, fe/SiO is improved as much as possible 2 The slag quantity is reduced; in the presence of iron sulphide, copper sulphide is almost presentIs not oxidized, and therefore, most of the copper remains as sulfide (Cu 2 S) phase into the copper matte.
At present, most of copper smelting plants have smelting process temperature of 1250-1300 ℃, when high lead-containing zinc-copper concentrate is processed in actual production, a small amount of high lead-containing zinc-copper concentrate is mainly added in the mixing and proportioning process, and the copper concentrate Pb+Zn in the furnace is controlled to be less than 5% by adopting a proper proportioning system, but the high zinc-containing copper concentrate is not processed in a large scale, and the main reason is that: 1. most of lead sulfide and a small amount of zinc sulfide volatilize into the flue in the smelting process, so that the flue is nodulated, the heat exchange efficiency of the flue is reduced, and the circulation of flue gas is blocked; 2. most of zinc in the copper concentrate is oxidized, zinc oxide is generated and enters slag, so that the viscosity and melting point of the slag are increased, and the slag cannot keep good fluidity. And the recovery rate of lead and zinc resources in the raw materials is low, wherein zinc in the smelting slag is not recovered. At the same time, high MgO content also causes the viscosity and melting point of slag to rise.
Therefore, there is a great need to provide an efficient recovery method that can treat high zinc-copper concentrate in large quantities and recover zinc resources therein.
Disclosure of Invention
The invention aims to provide a method for efficiently recycling zinc-copper concentrate resources with high zinc content, which is difficult to treat, and aims to realize mass treatment of the high zinc-copper concentrate and recycling of zinc resources in the high zinc-copper concentrate. The difficult-to-treat copper concentrate with high zinc content is copper concentrate with main element content of Cu 20-30%, zn > 8%, mgO > 3%, fe 20-28% and S27-32%.
The method for efficiently recycling the high zinc-containing copper concentrate resource provided by the invention comprises the following steps:
(1) Smelting: high zinc copper concentrate, quartz stone and coal are mixed according to Fe/SiO 2 After being mixed with the mass ratio of 1.6-2.0 and the coal rate of 1.5-5.0%, the mixture is conveyed to a side-blowing furnace feed opening through a belt and is continuously fed into the side-blowing furnace, oxygen enrichment is blown in, the temperature of a side-blowing furnace molten pool is controlled to be more than or equal to 1350 ℃, the copper matte making process is completed in the furnace by the materials, and melt and smoke are generatedDust; the generated melt is separated into a copper matte layer and a slag layer, wherein the copper matte layer is copper matte with copper grade more than 70%, the slag layer is high zinc-containing copper smelting slag, and the high zinc-containing copper smelting slag are intermittently discharged from corresponding discharge ports respectively; collecting smoke dust and returning to smelting;
(2) Fuming: transferring the high zinc-copper smelting slag generated in the step (1) into a fuming furnace, carrying out reduction fuming according to the coal rate of 15% -20% by adopting a discontinuous feeding and discontinuous slag discharging mode, blowing oxygen-enriched air, controlling the oxygen excess coefficient of a molten pool to be 0.8-0.9, reducing zinc oxide in the smelting slag into zinc steam while burning coal to release heat, and then oxidizing the zinc steam into zinc oxide in flue gas to be enriched, wherein the final reaction product is fuming slag and zinc oxide smoke dust.
The high zinc-containing copper smelting slag obtained in the step (1) mainly comprises iron oxide, zinc oxide, silicon dioxide, magnesium oxide and a small amount of mixed copper sulfide.
Preferably, in the step (1), the oxygen content of the oxygen enriched air is 75% -85%.
Preferably, in the step (1), the period of copper matte placement and slag discharge in the copper matte production process is 1.5-3 hours.
In some specific embodiments, in the step (1), the generated copper matte with the copper grade of more than 70% is directly sent to a copper converting process; returning generated smoke dust to a smelting furnace for smelting; and sending the generated high zinc-copper-containing smelting slag to a fuming furnace for subsequent treatment.
Slag formation is most important in the copper smelting process, and the smelting slag can keep good fluidity after most of copper enters smelting and most of impurities enter smelting slag. The invention ensures that most impurities enter the smelting slag and simultaneously ensures that the smelting slag keeps good fluidity by reasonably proportioning and controlling the smelting temperature to be more than or equal to 1350 ℃.
The main principle involved in the smelting process of the step (1) is as follows:
cu, fe and Zn in the copper concentrate mainly exist in sulfide phases, and the binding capacity of the sulfide phases and oxygen at high temperature is that zinc sulfide is more than iron sulfide is more than copper sulfide, so that when the grade of a small amount of iron and copper in the generated copper matte is more than 70 percent in the copper smelting process, most of iron can be oxidized into smelting slag, most of copper enters the copper matte, most of zinc is oxidized into the smelting slag, and a small amount of zinc volatilizes into smoke dust and enters the copper matte.
The smelting slag mainly comprises iron oxide, zinc oxide, silicon dioxide and magnesium oxide, and FeO-SiO is prepared when the MgO content is 6% calculated by using FactSAGE 2 The quaternary phase diagram of ZnO-MgO is shown in figure 1.
The quaternary phase diagram shown in fig. 1 is divided into regions (corresponding serial numbers are shown in fig. 2), so that the liquid phase quantity duty ratios of different regions can be obtained, and the liquid phase quantity duty ratios are shown in table 2. The liquid phase amount of each zone is 99.9% of the highest liquid phase amount of the No. 2 zone, and is almost the full liquid phase zone, which means that the viscosity of the slag is lowest and the performance of the slag is most stable in the No. 2 zone. Secondly, in the No. 3 area, the liquid phase accounts for 85.2 percent. In the phase diagram, the whole liquid phase amount of the right area in the triangle is higher, and the triangle belongs to the area with better slag composition. Since region No. 2 is almost a full liquid phase region, region No. 2 can be considered to be the most stable region. It is known from calculation that the slag performance is stable in Fe/SiO 2 The range can reach 0.68-3.18, and meanwhile, the requirement interval of the stable region for ZnO content is wider. Thus, in Fe/SiO 2 When the smelting temperature is more than or equal to 1350 ℃, the smelting slag has good fluidity, and the smelting temperature is less than or equal to 1.6-2.0.
Table 2 liquid phase ratio of each region in phase diagram
Preferably, in the step (2), the reduction fuming temperature is 1250-1350 ℃, the fuming charging time interval is consistent with the slag discharging interval in the smelting process in the step (1), and the charging and slag discharging period in the fuming process is 1.5-3 h.
Preferably, in the step (2), the oxygen content of the oxygen-enriched air is 25% -35%.
In some embodiments, the zinc oxide fumes from step (2) may be sent to a zinc hydrometallurgical system for treatment.
Cu mixed in the high zinc-copper smelting slag 2 S is kept unchanged in the fuming process, and after fuming, copper slag concentrate can be obtained through slow cooling beneficiation and returned to a smelting system.
The invention has the beneficial effects that:
the process flow can be used for treating high-zinc refractory copper concentrate in a large scale, solves the problem of influence of high zinc content on the smelting process, and simultaneously efficiently recovers valuable metal zinc in the copper concentrate. By Fe/SiO 2 The process parameters of 1.6-2.0 can reduce the amount of smelting slag, improve the zinc content in the smelting slag, reduce the residual zinc content in the fuming slag and realize high recovery rate of zinc.
Drawings
FIG. 1 shows the change of quaternary phase diagram at 1350 ℃;
FIG. 2 is a quaternary phase diagram region division at 1350 ℃;
fig. 3 is a schematic flow chart of the high zinc-containing copper concentrate process of the invention.
Detailed Description
The invention is described in further detail below in connection with specific embodiments. The following examples are only illustrative of the present invention and are not intended to limit the scope of the invention.
Example 1
(1) Smelting: 21.52% of Cu, 8.34% of Zn, 3.17% of Mg, 23.45% of Fe, 30.72% of S and SiO 2 6.77% of copper concentrate with high zinc content is taken as raw material according to Fe/SiO 2 And (2.0) adding quartz flux and granular coal with a coal rate of 2.5%, conveying to a feed opening of a side blowing furnace through a belt, continuously feeding into the side blowing furnace, blowing 80% of oxygen-enriched gas, keeping the temperature of a molten pool at 1350 ℃, and carrying out copper smelting reaction to produce copper matte with copper grade of 72.13%, hot smelting slag and smoke dust. The copper matte is discharged every 2 hours and is sent to the next converting process of a copper smelting system for treatment; returning the collected smoke dust to smelting treatment; the produced smelting slag is discharged to a fuming furnace for treatment every 3 hours, and the smelting slag contains 13.16 percent of ZnO, 5.98 percent of MgO, 2.35 percent of Cu and FeO 53.06％、SiO 2 20.63% and good slag fluidity at the smelting temperature.
(2) Fuming: transferring the hot smelting slag into a fuming furnace, adopting a discontinuous feeding and discontinuous slag discharging mode, blowing in 25% of oxygen-enriched air at 1350 ℃, carrying out reduction fuming according to the coal rate of 16%, controlling the oxygen excess coefficient of a molten pool to be 0.8, reducing zinc oxide in the smelting slag into zinc steam, oxidizing the zinc steam into zinc oxide in flue gas to be enriched, and sending the captured zinc oxide smoke dust to a zinc hydrometallurgy system for treatment. And deslagging every 3 hours, wherein zinc ZnO 2.24% and Cu 2.64% are remained in the fuming slag, and the beneficiation treatment can be performed after slow cooling.
Example 2
(1) Smelting: 21.52% of Cu, 8.34% of Zn, 3.17% of Mg, 23.45% of Fe, 30.72% of S and SiO 2 6.77% of copper concentrate with high zinc content is taken as raw material according to Fe/SiO 2 The method comprises the steps of (1.8) adding quartz flux and granular coal with the coal rate of 3.2%, conveying to a feed opening of a side-blowing furnace through a belt, continuously feeding into the side-blowing furnace, blowing 75% of oxygen enrichment, and keeping the temperature of a molten pool at 1360 ℃ for copper smelting reaction. Producing copper matte with copper grade of 72.35%, hot smelting slag and smoke dust, and discharging the copper matte to a next converting process of a copper smelting system every 2.5h for treatment; returning the collected smoke dust to smelting treatment; the produced smelting slag is discharged to a fuming furnace for treatment every 2.5h, and the smelting slag contains 12.84 percent of ZnO, 5.84 percent of MgO, 2.43 percent of Cu, 51.85 percent of FeO and SiO 2 22.39% and good slag fluidity at the smelting temperature.
(2) Fuming: transferring the hot smelting slag into a fuming furnace, adopting a discontinuous feeding and discontinuous slag discharging mode, blowing 28% of oxygen-enriched air at 1300 ℃, carrying out reduction fuming according to 18% of coal rate, controlling the oxygen excess coefficient of a molten pool to be 0.85, reducing zinc oxide in the smelting slag into zinc steam, oxidizing the zinc steam into zinc oxide in flue gas to be enriched, and sending the captured zinc oxide smoke dust to a zinc hydrometallurgy system for treatment. And deslagging every 2.5 hours, wherein zinc ZnO 2.01% and Cu 2.75% remain in the fuming slag, and carrying out mineral separation treatment after slow cooling.
Example 3
(1) Smelting: in Cu 21.52%、Zn 8.34％、Mg 3.17％、Fe 23.45％、S 30.72％、SiO 2 6.77% of copper concentrate with high zinc content is taken as raw material according to Fe/SiO 2 Quartz flux and granular coal with the coal rate of 3.8 percent are matched into the furnace, the mixture is conveyed to a feed opening of a side-blowing furnace through a belt, the mixture is continuously fed into the side-blowing furnace, 85 percent of oxygen enrichment is blown into the side-blowing furnace, the temperature of a molten pool is kept at 1350 ℃, and copper smelting reaction is carried out. Copper matte with copper grade of 71.88%, hot smelting slag and smoke dust are produced, and the copper matte is discharged to the next converting process of a copper smelting system for treatment every 2.5 h; returning the collected smoke dust to smelting treatment; the produced smelting slag is discharged to a fuming furnace for treatment every 2 hours, and the smelting slag contains 12.50 percent of ZnO, 5.68 percent of MgO, 2.53 percent of Cu, 50.41 percent of FeO and SiO 2 24.49%, and good slag fluidity at smelting temperature.
(2) Fuming: transferring the hot smelting slag into a fuming furnace, adopting a discontinuous feeding and discontinuous slag discharging mode, blowing in 30% of oxygen-enriched air at 1300 ℃, carrying out reduction fuming according to the coal rate of 20%, controlling the oxygen excess coefficient of a molten pool to be 0.85, reducing zinc oxide in the smelting slag into zinc steam, oxidizing the zinc steam into zinc oxide in flue gas to be enriched, and sending the captured zinc oxide smoke dust to a zinc hydrometallurgy system for treatment. And deslagging every 2 hours, wherein zinc ZnO 1.89% and Cu 2.85% remain in the fuming slag, and carrying out mineral separation treatment after slow cooling.
Example 4
(1) Smelting: 22.36% of Cu, 8.56% of Zn, 3.35% of Mg, 25.15% of Fe, 30.29% of S and SiO 2 5.44% of high zinc copper concentrate is taken as raw material according to Fe/SiO 2 Quartz flux and granular coal with the coal rate of 2.2 percent are matched into the furnace, the mixture is conveyed to a feed opening of a side-blowing furnace through a belt, the mixture is continuously fed into the side-blowing furnace, 80 percent of oxygen enrichment is blown in, the temperature of a molten pool is kept at 1350 ℃, and copper smelting reaction is carried out. Copper matte with copper grade of 72.34%, hot smelting slag and smoke dust are produced, and the copper matte is discharged every 2 hours and sent to the next converting process of a copper smelting system for treatment; returning the collected smoke dust to smelting treatment; the produced smelting slag is discharged to a fuming furnace for treatment every 1.5h, and the smelting slag contains 12.85 percent of ZnO, 5.84 percent of MgO, 2.69 percent of Cu, 51.85 percent of FeO and SiO 2 22.39% and good slag fluidity at the smelting temperature.
(2) Fuming: transferring the hot smelting slag into a fuming furnace, adopting a discontinuous feeding and discontinuous slag discharging mode, blowing in 35% of oxygen-enriched air at 1250 ℃, carrying out reduction fuming according to the coal rate of 15%, controlling the oxygen excess coefficient of a molten pool to be 0.8, reducing zinc oxide in the smelting slag into zinc steam, oxidizing the zinc steam into zinc oxide in flue gas to be enriched, and sending the captured zinc oxide smoke dust to a zinc hydrometallurgy system for treatment. Slag is discharged every 1.5 hours, zinc ZnO 2.34% and zinc ZnO 3.01% are remained in the fuming slag, and mineral separation treatment can be carried out after slow cooling.
Claims (9)
1. A method for efficiently recycling high zinc-containing copper concentrate resources comprises the following steps:
(1) Smelting: high zinc copper concentrate, quartz stone and coal are mixed according to Fe/SiO 2 After the materials are proportioned according to the mass ratio of 1.6-2.0 and the coal rate of 1.5-5.0%, the materials are conveyed to a feed opening of a side-blowing furnace through a belt and are continuously fed into the side-blowing furnace, oxygen enrichment is blown in, the temperature of a molten pool of the side-blowing furnace is controlled to be more than or equal to 1350 ℃, and the copper matte making process is completed in the furnace by the materials, so that melt and smoke dust are generated; the generated melt is separated into a copper matte layer and a slag layer, wherein the copper matte layer is copper matte with copper grade more than 70%, the slag layer is high zinc-containing copper smelting slag, and the high zinc-containing copper smelting slag are intermittently discharged from corresponding discharge ports respectively; collecting smoke dust and returning to smelting;
(2) Fuming: transferring the high zinc-copper smelting slag generated in the step (1) into a fuming furnace, carrying out reduction fuming according to the coal rate of 15% -20% by adopting a discontinuous feeding and discontinuous slag discharging mode, blowing oxygen-enriched air, controlling the oxygen excess coefficient of a molten pool to be 0.8-0.9, reducing zinc oxide in the smelting slag into zinc steam while burning coal to release heat, and then oxidizing the zinc steam into zinc oxide in flue gas to be enriched, wherein the final reaction product is fuming slag and zinc oxide smoke dust.
2. The method according to claim 1, wherein the composition of the high zinc copper smelting slag obtained in step (1) is mainly iron oxide, zinc oxide, silica and magnesia.
3. The method of claim 1, wherein in step (1), the oxygen-enriched gas has an oxygen content of 75% to 85%.
4. The method according to claim 1, wherein in the step (1), the period of copper matte placement and slag removal in the copper matte making process is 1.5-3 hours.
5. The method according to claim 1, wherein in the step (1), copper matte with copper grade higher than 70% is produced and directly sent to a copper converting process; returning generated smoke dust to a smelting furnace for smelting; and sending the generated high zinc-copper-containing smelting slag to a fuming furnace for subsequent treatment.
6. The method according to claim 1, wherein in the step (2), the reduced fuming temperature is 1250-1350 ℃, the fuming charging time interval is consistent with the slag discharging interval in the smelting process in the step (1), and the charging and slag discharging period in the fuming process is 1.5-3 h.
7. The method according to claim 1, wherein in step (2), the oxygen content of the oxygen enriched air is 25% to 35%.
8. The method of claim 1, wherein the zinc oxide fumes in step (2) are sent to a zinc hydrometallurgical system for treatment.
9. The method according to claim 1, wherein the high zinc copper smelting slag contains Cu 2 S is kept unchanged in the fuming process, and after fuming, copper slag concentrate is obtained through slow cooling beneficiation and returned to a smelting system.
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2023
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