Method for reducing melting point of high-zinc oxide material and application thereof

Abstract

The application provides a method for reducing the melting point of high-zinc oxide materials, which comprises the following steps: mixing high-zinc oxide materials, a slagging agent and a fluxing agent to obtain a mixture; the content of zinc elements in the high-zinc oxide materials is greater than or equal to 25 wt%; wherein the mixture comprises CaO: 5-10 wt.%, SiO2: 12-20 wt.%; FeO x : 6-12 wt.%; the fluxing agent comprises one or more of copper elements, manganese elements and lead elements. On the one hand, CaO, SiO2 and FeO x are introduced into the mixture to jointly constitute a five-component slag system ZnO-PbO-FeO x -CaO-SiO2, and the synergistic intermelting effect among the components can be achieved. On the other hand, the fluxing agent can also promote the melting of the high-zinc materials. Therefore, the melting point of the high-zinc oxide materials can be effectively reduced, the high-zinc oxide materials can be melted and flowed at a conventional non-ferrous smelting temperature, and the requirements of the smelting process of a molten pool can be met.

Description

Technical Field

[0001] This invention relates to the field of metal reduction and recycling, and more particularly to a method and application for reducing the melting point of high zinc oxide materials. Background Technology

[0002] Currently, the treatment of zinc-containing solid wastes such as steel plant flue dust, fuming furnace dust, particulate oxides from lead-zinc pyrometallurgical processes, and zinc leaching slag typically employs hydrometallurgical processes. However, these processes have significant drawbacks. Specifically, hydrometallurgical processes struggle to handle complex zinc-containing solid wastes, often only processing relatively simple zinc oxides and recovering zinc resources through leaching-deposition. Furthermore, hydrometallurgical processes easily generate secondary pollution such as highly acidic and highly toxic hazardous wastes, requiring further treatment to meet environmental regulations. Therefore, various complex zinc-containing solid wastes currently require pyrometallurgical methods for treatment to recover zinc, copper, lead, and other rare and precious metals.

[0003] Currently, pyrometallurgical zinc smelting mainly employs the sintering-blast furnace process. However, this process suffers from heavy SO2 and other flue gas pollution during sintering, and also results in significant energy loss. The industry is vigorously developing molten pool zinc smelting technology to achieve a shorter, cleaner pyrometallurgical zinc smelting process. Compared to the sintering-blast furnace pyrometallurgical process, molten pool smelting has significant advantages in terms of energy consumption, environmental protection, and valuable metal recovery. However, high-zinc-content oxide materials (with Zn content above 25 wt.%), such as steel mill flue dust, fuming furnace dust, particulate oxides from lead-zinc pyrometallurgical enterprises, and sintering return powder, have high melting points and are difficult to melt and flow at conventional non-ferrous smelting temperatures, thus failing to meet the requirements of the molten pool smelting process. Summary of the Invention

[0004] The main objective of this invention is to provide a method and application for reducing the melting point of high-zinc oxide materials, in order to solve the technical problem that high-zinc oxide materials are difficult to melt and flow at conventional non-ferrous smelting temperatures, thus failing to meet the requirements of molten pool smelting processes.

[0005] To achieve the above objectives, the present invention provides a method for reducing the melting point of high zinc oxide materials, comprising:

[0006] A mixture of high-zinc oxide material, slag-forming agent, and fluxing agent is obtained; the zinc content in the high-zinc oxide material is ≥25 wt%; wherein, the mixture comprises: CaO: 5-10 wt.%, SiO2: 12-20 wt.%, FeO x 6-12 wt.%; the fluxing agent includes one or more of copper, manganese and lead.

[0007] According to embodiments of this application, the slag-forming agent includes one or more of quartz sand, quicklime, and calcium carbonate.

[0008] According to an embodiment of this application, the mass fraction of the melt accelerator in the mixture is 3-10 wt.%.

[0009] According to the embodiments of this application, the sources of the copper, manganese and lead elements are one or more of smelting raw materials, industrial solid waste and urban minerals, respectively.

[0010] According to the embodiments of this application, the fluxing agent is a copper-containing material and / or a manganese-containing material. The copper-containing material includes one or more of copper oxide, copper powder, scrap copper, and copper slag. The manganese-containing material includes manganese dioxide and / or manganese carbonate.

[0011] The present invention also provides an application of a method for reducing the melting point of high zinc oxide materials in molten pool smelting, comprising:

[0012] The high-zinc oxide material is processed using the method described above to obtain the smelting material;

[0013] The smelting material is subjected to oxidation treatment to obtain oxidation products.

[0014] According to an embodiment of this application, in the oxidation treatment, the heating process is conducted in a non-oxidizing atmosphere, wherein the oxygen potential ranges from 10. -7 ~10 -3 atm.

[0015] According to embodiments of this application, the atmosphere in the oxidation process includes CO2, CO, and H2O.

[0016] According to an embodiment of this application, the temperature in the oxidation treatment is 1190°C to 1230°C.

[0017] The above-mentioned method for lowering the melting point of high zinc oxide materials involves, on the one hand, introducing CaO, SiO2, and FeO into the mixture. x Together they constitute the five-element slag system ZnO-PbO-FeO x By combining CaO and SiO2 and adjusting the proportions of each component in this pentagonal slag system, synergistic intermelting effects between the components can be achieved, thus effectively reducing the melting temperature of high-zinc oxide materials. On the other hand, the fluxing agent can also promote the melting of high-zinc materials. Under the combined effect of these two factors, the melting point of high-zinc oxide materials can be effectively reduced, allowing them to melt and flow at conventional non-ferrous smelting temperatures, meeting the requirements of molten pool smelting processes. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is an industrial site photograph of the high-zinc oxide slag treatment process in Example 2 of this application;

[0020] Figure 2 This is a physical image of the high zinc oxide flowability in Example 3 of this application;

[0021] Figure 3 This is a photograph of the comparative sample before and after heating in Comparative Example 1 of the present invention.

[0022] The realization of the objective, functional characteristics and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0025] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0026] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0027] The applicant discovered through extensive research that high-zinc oxides have a high ZnO content. PbO has a melting point of 888℃, while ZnO has a melting point as high as 1975℃. Therefore, if the ZnO content in the material is high, it is difficult to melt the material at conventional smelting temperatures, and consequently, it is impossible to smoothly achieve the flow between sections during the molten pool smelting process.

[0028] Based on this, in order to achieve the above objective, the present invention provides a method for reducing the melting point of high zinc oxide materials, comprising:

[0029] A mixture of high-zinc oxide material, slag-forming agent, and fluxing agent is obtained; the zinc content in the high-zinc oxide material is ≥25 wt%; wherein, the mixture comprises: CaO: 5-10 wt.%, SiO2: 12-20 wt.%, FeO x 6-12 wt.%; the fluxing agent includes one or more of copper, manganese and lead.

[0030] High-zinc oxide materials can specifically include high-zinc-content oxide materials such as steel plant flue dust, fuming furnace dust, particulate oxides from lead-zinc pyrometallurgical enterprises, and sintering return powder.

[0031] High zinc oxide materials include ZnO, PbO, and FeO. x It may also include CaO and SiO2. The components in high-zinc oxide materials can be analyzed in advance to determine the content of each component. For example, the content of ZnO, PbO, and FeO can be determined. x The content of CaO and SiO2. Based on this, an appropriate type and amount of slagging agent are added to obtain a mixture with the target composition of CaO: 5-10 wt.%, SiO2: 12-20 wt.%, and FeO. x The standard is 6-12 wt.%.

[0032] For example, when the CaO and SiO2 in the high zinc oxide feedstock are insufficient compared to the target composition of the mixture, a slagging agent containing CaO and SiO2 can be selected, with the amount of the slagging agent added being such that the mixture reaches the target composition.

[0033] High-zinc oxide feedstocks, when combined with slag-forming agents—that is, CaO and SiO2 are introduced into the mixture—to form a pentagonal slag system: ZnO-PbO-FeO. x -CaO-SiO2. The added CaO and SiO2 can form phases such as ZnFe2O4, ZnSiO4, and Ca2ZnSi2O7. These phases form a low-melting-point solid solution through eutectic reaction. Therefore, by controlling the above five-element slag system ZnO-PbO-FeO xThe proportions of each component in CaO-SiO2 can achieve synergistic intermelting, allowing them to form liquid slag at a lower temperature, thus effectively reducing the melting temperature of high zinc oxide materials.

[0034] If the CaO ratio is higher than this ratio, it will lead to an increase in free CaO with a high melting point, thus raising the melting point of the high zinc oxide material. If the CaO ratio is lower than this ratio, it will lead to an increase in the relative proportion of SiO2, which will increase the viscosity of the high zinc oxide material and reduce its fluidity.

[0035] If the SiO2 ratio is higher than this ratio, the viscosity of the high zinc oxide material will increase, resulting in a decrease in fluidity; if the SiO2 ratio is lower than this ratio, the content of free ZnO, CaO and FeO phases in the system will increase, thus raising the melting point.

[0036] If FeO x If the proportion is higher than this, it will lead to the release of free FeO in the high zinc oxide material. x An increase in FeO content leads to an increase in the melting point of the system. x If the proportion is lower than this, the amount of low-melting-point components such as FeO·SiO2 generated will decrease, which will also increase the melting point of the system.

[0037] In some embodiments, the slagging agent includes one or more of silica sand, quicklime, and calcium carbonate. Specifically, the silica sand can be industrial silica sand. The type of slagging agent is selected as needed.

[0038] High zinc oxide materials include ZnO, PbO, and FeO. x By combining slag-forming agents, CaO and SiO2 are introduced into the mixture, forming a five-element slag system ZnO-PbO-FeO. x -CaO-SiO2. In the mixture, the low-melting-point component PbO can melt first to form a melt and can form the PbO·xSiO2 phase. The high-melting-point component ZnO can undergo a phase transformation when the melting temperature reaches above 1100℃, forming phases such as ZnFe2O4, ZnSiO4, and Ca2ZnSi2O7. These phases form a low-melting-point solid solution through eutectic reaction. By adjusting the above five-element slag system ZnO-PbO-FeO x The proportions of each component in CaO-SiO2 can achieve synergistic intermelting, allowing them to form liquid slag at a lower temperature, thus effectively reducing the melting temperature of high zinc oxide materials.

[0039] Specifically, the addition of copper-containing, manganese-containing, and lead-containing materials can improve the already formed pentagonal slag system ZnO-PbO-FeO. x Based on CaO-SiO2, a six-membered slag system ZnO-PbO-MO is further formed.x -FeO x -CaO-SiO2, where M is one or both of Cu and Mn. This further reduces the overall melting temperature of the slag system.

[0040] For example, when the added flux is a copper-containing material, Cu + With Zn 2+ Ion exchange occurs, and the ions penetrate into the lattice of the refractory ZnO phase, causing the ZnO crystal to become unstable and destroyed. This lowers the overall melting point of the high zinc oxide material, while this effect has not been observed with other metal ions.

[0041] For example, when the fluxing agent is a manganese-containing material, Mn 2+ It can then penetrate into the interior of the refractory ZnFe2O4 crystal structure and disrupt it. This disruption of the refractory phase crystal structure promotes the melting of high-zinc materials.

[0042] For example, when the fluxing agent is a lead-containing material, the fluxing efficiency of the ZnO-PbO-FeO slag system can be improved. x The proportion of PbO in CaO-SiO2 is reduced, and the proportion of ZnO in the slag system is reduced accordingly. Thermodynamic analysis shows that the melting temperature of the slag system decreases accordingly.

[0043] By adding a fixed proportion of slag-forming agent and melting accelerator to the high zinc oxide material, the melting point of the smelting raw material, namely the desulfurization product of the high zinc oxide material, is reduced, so that the high zinc oxide material can be fully melted and thus flow smoothly between the sections in the molten pool smelting process.

[0044] It is understandable that the mixing order of high zinc oxide material, slag-forming agent and melt accelerator can be unrestricted.

[0045] For example, the high zinc oxide material, slag-forming agent and melt accelerator are mixed simultaneously.

[0046] Another example is to first mix the high zinc oxide material and the slagging agent, and then mix them with the melt accelerator.

[0047] Another example is to first mix the high zinc oxide material and the fluxing agent, and then mix them with the slagging agent.

[0048] The above-mentioned method for lowering the melting point of high zinc oxide materials involves, on the one hand, introducing CaO, SiO2, and FeO into the mixture. x Together they constitute the five-element slag system ZnO-PbO-FeO xBy combining CaO and SiO2 and adjusting the proportions of each component in this pentagonal slag system, synergistic intermelting effects between the components can be achieved, thus effectively reducing the melting temperature of high-zinc oxide materials. On the other hand, the fluxing agent can also promote the melting of high-zinc materials. Under the combined effect of these two factors, the melting point of high-zinc oxide materials can be effectively reduced, allowing them to melt and flow at conventional non-ferrous smelting temperatures, meeting the requirements of molten pool smelting processes.

[0049] In some embodiments, the sources of the copper, manganese, and lead elements are one or more of smelting raw materials, industrial solid waste, and urban minerals, respectively.

[0050] In some embodiments, the mass fraction of the fluxing agent in the smelting material is 3-10 wt.%.

[0051] The addition of copper and manganese fluxing agents forms copper oxides and manganese oxides, constituting a six-membered slag system ZnO-PbO-MO. x -FeO x -CaO-SiO2 (where M is one or both of Cu and Mn), where Cu + or Mn 2+ The copper and manganese fluxes penetrate the refractory ZnO and ZnFe2O4 lattice, causing crystal destruction and lowering the melting point of the system. However, if the proportion of copper and manganese fluxes added is too low, the fluxing effect will not be significant.

[0052] If the proportion of added flux is too high, it will lead to an increase in excess Cu2O. Since Cu2O itself has a melting point of 1235℃, it is not conducive to lowering the melting point of the system. As for MnO, it easily strips SiO2 to form manganese olivine 2MnO·SiO2, resulting in a decrease in the effective proportion of SiO2 and an increase in the melting point of the system.

[0053] In some embodiments, the fluxing agent is a copper-containing material and / or a manganese-containing material, wherein the copper-containing material includes one or more of copper oxide, copper powder, scrap copper and copper slag, and the manganese-containing material includes manganese dioxide and / or manganese carbonate.

[0054] Manganese-containing materials can be derived from industrial manganese dioxide, manganese carbonate, manganese concentrate, etc. Copper-rich materials include, but are not limited to, industrial copper oxide, copper powder, scrap copper, copper slag, etc.

[0055] The present invention also provides an application of a method for reducing the melting point of high zinc oxide materials in molten pool smelting, comprising:

[0056] The high-zinc oxide material is processed using the method described above to obtain the smelting material;

[0057] The smelting material is subjected to oxidation treatment to obtain oxidation products.

[0058] In some embodiments, during the oxidation process, the heating process is conducted in a non-oxidizing atmosphere, wherein the oxygen potential ranges from 10. -7 ~10 -3 ATM. The heating and melting process can be carried out using, but is not limited to, natural gas, coal, coke combustion or electric heating. The heating process is controlled in a non-oxidizing atmosphere, wherein the oxygen potential range is 10. -7 ~10 -3 atm (oxygen partial pressure meter).

[0059] This oxygen potential range ensures that ferrous iron is not oxidized to ferric iron (Fe2+) and is not reduced to elemental iron. Above 10... -3 Atm readily causes the oxidation of ferrous iron to form Fe3O4 or Fe2O3, leading to an increase in the system's melting point; while below 10 -7 Atm will create a reducing atmosphere, which will reduce the metal oxides to form metals.

[0060] In some embodiments, the atmosphere in the oxidation process includes CO2, CO, and H2O.

[0061] The gaseous components of a non-oxidizing atmosphere include CO2, CO, and H2O. This atmosphere is formed during the heating process of materials using natural gas, coal gas, coke, or coal as fuel, with CO2 as the main component. Here, oxygen potential refers to the partial pressure of free O2 in the atmosphere, measured in atm. The concentration of free O2 is 10... -3 Up to 10 -7 %, that is, the partial pressure of free oxygen is 10. -3 Up to 10 -7 atm, oxygen potential 10 - 3 The CO2 / CO ratio corresponding to atm is 20. Oxygen potential is 10. -7 Atm corresponds to pure CO2, so the CO2 / CO ratio in the atmosphere must be greater than 20. If the oxygen potential is below 10... -7 If the oxygen potential is above 10, it will cause the material to be reduced, generating elemental zinc which will volatilize as gaseous zinc, resulting in zinc loss. -3 Atm will cause the oxidation of ferrous iron in the material to form high-melting-point Fe2O3 and Fe3O4, thus increasing the melting temperature of the material.

[0062] In some embodiments, the temperature in the oxidation process is 1190°C to 1230°C.

[0063] The technical solution of this application will be described below with reference to specific embodiments.

[0064] Example 1

[0065] Melting of sintered return powder

[0066] Melt flow tests were conducted using sintered recycled powder from the ISP process as a high-zinc oxide feedstock. The contents of the main elements in the sintered recycled powder were determined to be Zn 34.36 wt.%, Pb 18.73 wt.%, CaO 5.27 wt.%, SiO2 3.19 wt.%, Cu 0.87 wt.%, and Fe 9.19 wt.%.

[0067] 1. Add slag-forming agents quicklime and quartz sand to the sintering return powder, and add a small amount of lead matte (containing 65 wt.% Cu and 30 wt.% Pb) as a fluxing agent. By adjusting the amount of slag-forming agent and fluxing agent added, the mixture is made to contain 5.5 wt.% CaO, 17.4 wt.% SiO2, and 17.4 wt.% FeO. x The content of the main elements is 6.9 wt.% (calculated as Fe), forming a mixture of Zn 26.5 wt.%, Pb 15.5 wt.%, Cu 4.6 wt.%, Fe 6.9 wt.%, CaO 5.5 wt.%, and SiO2 17.4 wt.%.

[0068] 2. Natural gas (CH4) was used to burn and heat the mixture to achieve a temperature of 1190℃. When the temperature was reached, the mixture was fully melted and the fluid had good flowability.

[0069] Example 2

[0070] Based on the melt formed in Example 1, a certain proportion of particulate oxide (containing 50 wt.% zinc) was added, wherein the mass ratio of particulate oxide to melt was 1:5, in order to further increase the zinc content in the oxide material and conduct melt flow tests.

[0071] 1. In addition to adding granular oxides to the melt, quicklime and quartz sand, as slag-forming agents, are added in a certain proportion to adjust the CaO content in the mixture to 6.0 wt.%, SiO2 to 18.9 wt.%, and FeO to 18.9 wt.%. x It is 6.2 wt.% (based on Fe).

[0072] 2. Natural gas combustion and heating / insulation are still used. At 1200℃, the material is visibly completely melted, and after slag discharge, the material exhibits good fluidity (see...). Figure 1 The analysis revealed that the contents of the main elements in the melt were Zn 28.8 wt.%, Pb 14.4 wt.%, Cu 2.1 wt.%, Fe 7.4 wt.%, CaO 6.1 wt.%, and SiO2 17.9 wt.%, indicating that the method can achieve the melting and flow of high zinc oxide materials with a Zn content of 28.8 wt.%.

[0073] Example 3

[0074] Melt flow tests were conducted on a high zinc content lead-zinc oxide material with a zinc content of 33.4 wt.% (ZnO 41.7 wt.%) and a lead content of 14.3 wt.% (PbO 15.4 wt.%).

[0075] 1. Slag-forming components CaO and SiO2 were added to high-zinc-content lead-zinc oxide feedstock, and a fluxing agent Cu2O was added to form a mixture with the following contents: ZnO 41.7wt.%, PbO 15.4wt.%, Cu2O 10.0wt.%, FeO 9.9wt.%, CaO 6.6wt.%, and SiO2 16.5wt.%. After melting point and high-temperature viscosity tests, the total melting temperature of this feedstock system was 1205℃, and the high-temperature viscosity was 0.171 Pa·S.

[0076] 2. A melting test was conducted on the material. The material was heated to 1230℃ and held for 30 minutes. After pouring the material out, the melt was observed to flow out rapidly (see [reference]). Figure 2 This meets the requirements for molten pool smelting.

[0077] Comparative Example 1

[0078] This comparative example serves as the control group. A sintered block (zinc content 33.4 wt.%) from an ISP pyrometallurgical lead-zinc smelter was used for melting tests: the sintered block was heated to 1350℃ and held for 120 min before the sample was removed (see...). Figure 3 ),in, Figure 3 (a) is the sample before heating. Figure 3 (b) shows the sample after heating. It can be seen that the sintered block hardly changed before and after heating. This indicates that the high zinc oxide material did not melt even at a temperature as high as 1350℃.

[0079] Compared with Comparative Example 1, in Example 2, the same zinc content oxide material, with the adjustment of slag type and the addition of a melting accelerator, can achieve a reduction in the melting point of the material system and a smooth flow of the material.

[0080] Comparative Example 2

[0081] This comparative example serves as a control test for Example 3. A melt flow test was conducted on a high-zinc-content lead-zinc oxide material with a zinc content of 33.4 wt.% (ZnO 41.7 wt.%) and a lead content of 14.3 wt.% (PbO 15.4 wt.%).

[0082] 1. CaO and SiO2, slag-forming components, were added to a high-zinc-content lead-zinc oxide feedstock. Cu2O, a fluxing agent, was also added, but the ratio of CaO and SiO2 was different from that in Example 3. A mixture was formed with the following contents: ZnO 41.7wt.%, PbO 15.4wt.%, Cu2O 10.0wt.%, FeO 9.9wt.%, CaO 14.6wt.%, and SiO2 8.5wt.%. After melting point and high-temperature viscosity tests, the total melting temperature of this feedstock system reached 1430℃, which is much higher than the total melting temperature of Example 3.

[0083] 2. A melting test was conducted on the material. The material was heated to 1230℃ and held for 30 minutes. The material was then poured out and found that it could not flow and could not meet the requirements for molten pool smelting.

[0084] Comparative Example 3

[0085] This comparative example serves as a control test for Example 3. A melt flow test was conducted on a high-zinc-content lead-zinc oxide material with a zinc content of 33.4 wt.% (ZnO 41.7 wt.%) and a lead content of 14.3 wt.% (PbO 15.4 wt.%).

[0086] 1. CaO and SiO2, slag-forming components, were added to a high-zinc-content lead-zinc oxide feedstock, with the same proportions of CaO, SiO2, and FeO as in Example 3, but without the addition of the fluxing agent Cu2O. PbO was added to keep the ZnO content constant, forming a mixture with the following contents: ZnO 41.7 wt.%, PbO 25.4 wt.%, FeO 9.9 wt.%, CaO 6.6 wt.%, and SiO2 16.5 wt.%. Melting point and high-temperature viscosity tests showed that the total melting temperature of this feedstock reached 1285°C, which is higher than the total melting temperature of Example 3.

[0087] 2. A melting test was conducted on the material. The material was heated to 1230°C and held for 30 minutes. The material was then poured out, and it was found that the material's fluidity decreased. The high-temperature viscosity value was 1.233 Pa·S, which was much higher than that in Example 3.

[0088] The above embodiments and comparative examples illustrate the method for reducing the melting point of high zinc oxide materials in this application. This method can effectively reduce the melting point of high zinc oxide materials, allowing them to melt and flow at conventional non-ferrous smelting temperatures, thus meeting the requirements of molten pool smelting processes.

[0089] The above technical solutions of the present invention are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made under the technical concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A method for reducing the melting point of high-zinc oxide materials, characterized in that, include: High zinc oxide material, slag-forming agent and melt accelerator are mixed to obtain a mixture; The high zinc oxide material includes ZnO, PbO, and FeO. x , The zinc content in the high-zinc oxide material is ≥25wt%; The mixture comprises: CaO: 5-10 wt.%, SiO2: 12-20 wt.%, FeO x 6-12 wt.%; The fluxing agent includes cuprous oxide.

2. The method according to claim 1, characterized in that, The slag-forming agent includes one of quartz sand, quicklime, and calcium carbonate.

3. The method according to claim 1, characterized in that, In the mixture, the mass fraction of the melt accelerator is 3-10 wt.%.

4. The application of the method for reducing the melting point of high-zinc oxide materials according to any one of claims 1 to 3 in molten pool smelting, characterized in that, include: The high zinc oxide material is processed by any one of the methods described in claims 1 to 3 to obtain a smelting material; the smelting material is then subjected to oxidation treatment to obtain an oxidation product.

5. The application according to claim 4, characterized in that, In the oxidation process, the heating process is carried out in a non-oxidizing atmosphere, wherein the oxygen potential ranges from 10. -7 ~10 -3 atm.

6. The application according to claim 5, characterized in that, The atmosphere in the oxidation process includes CO2, CO, and H2O.

7. The application according to any one of claims 4 to 6, characterized in that, In the oxidation process, the temperature is 1190℃~1230℃.

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