Oxygen-enriched side-blown smelting and fuming integrated furnace and method for recycling and treating zinc leaching residues thereof

Abstract

The invention discloses an oxygen-enriched side-blown smelting and fuming integrated furnace and a method for recycling and treating zinc leaching residues thereof. The integrated furnace comprises a hearth, a lead outlet, a first-layer oxygen lance, a slag outlet, a copper water jacket, a second-layer spray gun, a tertiary tuyere and a molten steel jacket. The method comprises the following steps: mixing zinc leaching residues, lead paste, a flux and a reducing agent, adding the mixture into an integrated furnace, introducing combustible gas and pulverized coal, carrying out a heating smelting reaction to produce a lead bullion layer, a copper matte layer, flue gas and a residue layer, and discharging the copper matte layer; when the slag line of the material in the furnace rises to 0.8-1.2 m, stopping adding the mixture; by controlling the amount of combustible gas and pulverized coal, lead in the molten slag is reduced out, and zinc oxide contained in the molten slag is subjected to temperature raising fuming treatment, so that secondary zinc oxide is obtained; after the metal is recycled, slag is discharged; and the flue gas is subjected to waste heat recovery and dust collection treatment, and obtained secondary zinc oxide smoke dust is directly sold or subjected to zinc oxide leaching. The zinc leaching residues are smelted by adopting the integrated furnace, the whole process is performed in one smelting furnace, and one furnace can be used for dual purposes, so that valuable metals are effectively recovered, and the metal recovery rate is high.

Description

I. Technical Field:

[0001] The present invention belongs to the field of metal smelting devices and their smelting processes, and particularly relates to an oxygen-enriched side-blowing smelting and fuming integrated furnace and a method for recycling zinc leaching residues. II. Background Art:

[0002] During the zinc smelting process, whether conventional hydrometallurgical zinc smelting, high-temperature and high-acid leaching, or direct oxygen technology for zinc smelting is used, a large amount of slag will inevitably be generated. These slags contain a large amount of valuable metals such as zinc, gold, silver, lead, copper, indium, etc. For example, the zinc leaching residues in conventional hydrometallurgical zinc smelting contain about 20% zinc, the sulfur tailing slags contain about 10% lead and more than 100 g / t silver, the high-temperature and high-acid leaching residues have a high direct zinc recovery rate, but are divided into lead-silver slags and iron-vanadium slags. The lead-silver slags contain about 4% lead and more than 400 g / t silver, and the iron-vanadium slags contain 1-2% lead, 100 g / t silver, and about 0.5% copper. These slags must be smelted to recover the valuable metals therein.

[0003] Traditional zinc leaching residues are generally volatilized by a rotary kiln, using coke powder as fuel and reducing agent. Since the rotary kiln is a rotating smelting device, it has poor sealing performance, high air leakage rate, large flue gas volume, and a large amount of heat carried away by the flue gas. At the same time, when the rotary kiln processes conventional leaching residues, the materials are in a semi-molten state, without agitation, and the heat transfer effect is poor, resulting in high production costs. At the same time, due to the semi-molten state of the materials, a molten pool cannot be formed, and a slag phase and a metal phase slag cannot be formed, and gold and silver cannot be enriched in the crude lead. Therefore, valuable metals with poor volatility such as lead, gold, silver, and copper are basically not recovered and enter the kiln slag to be discarded. Due to the high air leakage rate of the rotary kiln equipment, it is inconvenient to use oxygen-enriched air, resulting in a large flue gas volume and great difficulty in tail gas treatment. Direct emission cannot meet the environmental protection requirements, and desulfurization treatment must be carried out, increasing the construction investment and production costs. The by-products generated cannot be sold and are also disposed of as hazardous wastes.

[0004] The zinc recovery rate of the high-temperature and high-acid leaching slag is higher than that of conventional leaching, producing lead-silver slags and iron-vanadium slags. The lead-silver slags are mixed with lead-containing materials and subjected to thermal decomposition and then reduction in a reduction furnace. The tail gas enters the acid-making system to make acid, and precious metals such as gold and silver enter the crude lead for electrolysis. The reduced slag enters the fuming and blowing furnace to blow zinc oxide, and the iron-vanadium slags are also fed into the fuming and blowing furnace after batching. Silver and copper cannot be enriched in the crude lead, and valuable metals with poor volatility such as gold, silver, and copper are basically not recovered and enter the furnace slag to be discarded. Since the fuming and blowing furnace uses air to send pulverized coal, the flue gas volume is large and the flue gas treatment is very difficult. Desulfurization treatment must be carried out. Currently, a composite amine ionic liquid absorption and desorption method is used, but the construction investment and production costs increase.

[0005] Whether it is the rotary kiln for treating zinc conventional leaching residue or the reduction furnace + fuming furnace for treating high-temperature and high-acid residue, there are problems such as low metal recovery rate, large flue gas volume, difficult treatment of tail gas, high production cost, and poor economic applicability. III. Summary of the Invention:

[0006] The technical problem to be solved by the present invention is: aiming at the problems of high energy consumption, large flue gas volume, high production cost, and extremely poor recovery of valuable metals during the treatment of zinc conventional leaching residue by traditional rotary kilns, as well as the long process flow of the reduction + fuming and volatilization furnace for treating high-temperature and high-acid leaching residue, large flue gas volume of the fuming and volatilization furnace, poor recovery of valuable metals, and overall high production cost, the present invention provides a new oxygen-enriched side-blowing smelting and fuming integrated furnace and a method for recycling and treating zinc leaching residue. The technical solution of the present invention uses the smelting and fuming integrated furnace to smelt the zinc leaching residue. The whole smelting process is carried out in one smelting furnace, which can be used for two purposes, thus shortening the smelting process flow, reducing energy consumption, having a small flue gas volume, strong material applicability, more sufficient reaction, high heat utilization, and being able to effectively recover valuable metals; making its overall construction investment less, production cost low, and metal recovery high.

[0007] In order to solve the above problems, the technical solution adopted by the present invention is:

[0008] The present invention provides an oxygen-enriched side-blowing smelting and fuming integrated furnace. The integrated furnace includes a hearth, a lead tapping port, a first layer of oxygen lances, a slag tapping port, a copper water jacket, a second layer of spray guns, a third tuyere, and a steel water jacket. The hearth is located at the bottom of the integrated furnace body (for storing lead liquid rich in precious metals), the lead tapping port is located on one side of the integrated furnace body and communicates with the bottom of the hearth (the lead tapping port is used for siphoning lead); the first layer of oxygen lances is distributed on both sides of the furnace body and is located between the hearth brickwork and the copper water jacket; the slag tapping port is located on the other side of the integrated furnace body and is below the copper water jacket (for discharging slag); the copper water jacket is located in a circle above the hearth (for storing molten slag), and the second layer of spray guns is inserted through openings in the middle and lower parts of the copper water jacket; the third tuyere is located above the steel water jacket (on the membrane wall of the waste heat boiler), and the steel water jacket is located above the first layer of copper water jacket.

[0009] According to the above oxygen-enriched side-blowing smelting and fuming integrated furnace, the slag tapping port is 30 - 50 cm higher than the lead tapping port.

[0010] According to the above oxygen-enriched side-blowing smelting and fuming integrated furnace, both the first layer of oxygen lances and the second layer of spray guns are used for injecting pulverized coal and combustible gas.

[0011] In addition, a method for recycling and treating zinc leaching residue using the above oxygen-enriched side-blowing smelting and fuming integrated furnace is provided. The method includes the following steps:

[0012] a. Weigh the zinc leaching residue, lead paste, flux, and reducing agent separately using individual weighing belt scales, and then use a granulator to mix the four materials evenly to obtain a mixed material.

[0013] b. Send the obtained mixed material to the top of the oxygen-enriched side-blown smelting and fuming integrated furnace through a conveying device, and continuously add it into the integrated furnace through the charging port.

[0014] c. Inject combustible gas enriched with oxygen and pulverized coal into the integrated furnace through two layers of spray guns distributed on both sides of the integrated furnace for heating, and carry out a smelting reaction with the materials in the furnace. After the smelting reaction, a crude lead layer (gold, silver, lead, copper, antimony, and bismuth in the zinc leaching residue enter the crude lead), matte layer (the copper content in the zinc leaching residue is generally below 0.5%, and the matte layer produced is very thin), flue gas, and slag layer are produced; the produced matte layer is discharged from the lead outlet through the siphon port along with the crude lead.

[0015] d. During the smelting reaction process, when the slag line of the materials in the integrated furnace rises to 0.8 - 1.2 m, stop adding the mixed material; by adjusting the amount of oxygen-enriched air and pulverized coal injected into the spray gun, control the oxygen-carbon ratio to be 0.6 - 0.8:1 to reduce the lead in the molten slag; then continue to adjust the amount of oxygen-enriched air and pulverized coal injected into the spray gun, control the oxygen-carbon ratio to be 1.3 - 1.5:1, and raise the temperature to 1170 - 1220 °C to carry out temperature-raising fuming treatment on the zinc oxide contained in the molten slag. After the fuming treatment, secondary zinc oxide is obtained at the tertiary tuyere of the integrated furnace; after the metal recovery in the materials is completed, the waste molten slag in the furnace is discharged through the slag notch.

[0016] e. Recover the waste heat and collect the dust of the flue gas discharged from the smelting reaction to obtain pre-stage dust and treated flue gas. The treated flue gas is transported to the sulfuric acid production system for sulfuric acid production; a part of the obtained pre-stage dust is returned for recycling as smelting raw materials, and the remaining pre-stage dust is subjected to re-temperature-raising reduction treatment to obtain secondary dust, namely secondary zinc oxide dust, for direct external sales or zinc oxide leaching.

[0017] According to the above method for recycling and treating zinc smelting slag using an oxygen-enriched side-blown smelting and fuming integrated furnace, the flux described in step a is stone powder or quartz sand; the reducing agent is at least one of coke powder and pulverized coal.

[0018] According to the above method for recycling and treating zinc smelting slag using an oxygen-enriched side-blown smelting and fuming integrated furnace, when the zinc leaching residue, lead paste, reducing agent, and flux are mixed in the granulator in step a, the mass ratio between the zinc leaching residue, lead paste, reducing agent, and flux is 1:0.5:0.12 - 0.2:0.02 - 0.05, and the slag type is controlled as Fe:SiO₂ = 1.3 - 1.8:1, CaO:SiO₂ = 0.4 - 0.6:1.

[0019] According to the method for recycling and treating zinc smelting slag by using an oxygen-enriched side-blown smelting and fuming integrated furnace as described above, in step a, the water content of the obtained mixed material is controlled to be 8-12%.

[0020] According to the method for recycling and treating zinc smelting slag by using an oxygen-enriched side-blown smelting and fuming integrated furnace as described above, in step c during the smelting reaction, the smelting temperature is controlled to be 1150-1300 °C.

[0021] According to the method for recycling and treating zinc smelting slag by using an oxygen-enriched side-blown smelting and fuming integrated furnace as described above, in step e during the temperature-raising reduction treatment process, the temperature is controlled to be 1170-1250 °C.

[0022] In the structure of the oxygen-enriched side-blown smelting and fuming integrated furnace of the present invention, the hearth serves as a molten pool for storing crude lead liquid. The working refractory bricks at the bottom of the hearth should have the properties of resisting the scouring, erosion, and penetration of high-temperature melts, and the temperature fluctuations during lead discharging should be considered. The double-layer lance side-blown oxygen-enriched smelting furnace of the present invention operates periodically. The temperature of the molten pool in the furnace is high and fluctuates greatly. It is difficult to ensure the furnace body life relying solely on refractory materials, and the application of water-cooling technology is an effective measure to improve the furnace life. The temperatures of various parts in the furnace are different, and the working conditions are different, so the required cooling intensities are also different. Therefore, different water-cooling components need to be designed. The working conditions in the molten pool area are the most severe, and it has to bear the agitation of high-temperature melts and the chemical corrosion and repeated scouring of splashes. A strong cooling effect is required. Therefore, special copper water jackets are designed in this area to cool the refractory materials. Through reasonable water-cooling intensity, a stable slag coating layer can be formed on the hot surface of the refractory materials, thereby protecting the refractory materials. The lance is the core component of the oxygen-enriched side-blown smelting and fuming integrated furnace, which transports fuel and oxygen-enriched gas into the furnace, provides heat required for thermal decomposition reaction and reduction reaction in the furnace, and stirs the melt at the same time. By calculating and selecting reasonable gas ejection speeds and lance spacings, better reaction conditions are provided for the molten pool smelting. The oxygen-enriched side-blown smelting and fuming integrated furnace of the present invention is designed with double-layer lances, which are divided into upper and lower layers. In the lower layer of the furnace, several composite lances that can spray pulverized coal and gas are arranged according to the calculated spacing as the core for providing heat for the furnace. In the upper layer, several lances that can spray pulverized coal and gas are obliquely inserted around the cold material feeding area, using the flame gas flow to disperse the materials and using the heat to assist in heating and melting the upper-layer materials, and greatly improving the processing capacity of cold materials. A third tuyere is arranged at the bottom of the vertical flue to re-raise the temperature of the reduced slag through the lance, deeply reduce ZnO in the reduced slag in the oxygen-enriched double-layer lance side-blown furnace, reduce it to elemental Zn, and then oxidize it to ZnO at the third tuyere for recycling.

[0023] The positive and beneficial effects of the present invention:

[0024] 1. The technical solution of the present invention uses a smelting and fuming integrated furnace to smelt zinc leaching residue. The entire smelting process is carried out in one smelting furnace, which can be used for two purposes, thus shortening the smelting process flow, reducing energy consumption, having a small flue gas volume, strong material applicability, more sufficient reaction, high heat utilization, and being able to effectively recover valuable metals; making its overall construction investment small, production cost low, and metal recovery high.

[0025] 2. The oxygen-enriched side-blown smelting and fuming integrated furnace of the present invention is designed with double-layer spray guns, divided into upper and lower layers. Several composite spray guns that can spray pulverized coal and gas are arranged at the lower layer of the furnace according to the calculated spacing as the core to provide heat for the furnace. Several spray guns that can spray pulverized coal and gas are obliquely inserted in the upper layer and distributed around the cold material feeding place. The flame gas flow is used to disperse the material and the heat is used to assist in heating and melting the upper layer of material, and the processing capacity of cold materials is greatly improved. A third tuyere is arranged at the bottom of the vertical flue, and the reduced slag is reheated through the spray gun to deeply reduce and volatilize ZnO in the reduced slag in the oxygen-enriched double-layer spray gun side-blown furnace to form elemental Zn, and then oxidized to ZnO at the third tuyere for recycling. IV. Description of the Drawings:

[0026] Figure 1 Structural schematic diagram of the oxygen-enriched side-blown smelting and fuming integrated furnace of the present invention;

[0027] Figure 2 Cross-sectional structural schematic diagram of the oxygen-enriched side-blown smelting and fuming integrated furnace of the present invention;

[0028] In the figure: 1 is the hearth, 2 is the lead outlet, 3 is the first-layer oxygen lance, 4 is the slag outlet, 5 is the copper water jacket, 6 is the second-layer spray gun, 7 is the third tuyere, and 8 is the steel water jacket. V. Specific Embodiments:

[0029] The following further elaborates the present invention in combination with embodiments, but does not limit the protection scope of the technical solution of the present invention.

[0030] Example 1:

[0031] See the appendix Figure 1 and the appendix Figure 2, the oxygen-enriched side-blowing smelting and fuming integrated furnace of the present invention includes a hearth 1, a lead outlet 2, a first-layer oxygen lance 3, a slag outlet 4, a copper water jacket 5, a second-layer lance 6, a third tuyere 7 and a steel water jacket 8. The hearth 1 is located at the bottom of the integrated furnace body (for storing lead liquid rich in precious metals), and the lead outlet 2 is located on one side of the integrated furnace body and communicates with the bottom of the hearth 1 (the lead outlet is used for siphoning lead); the first-layer oxygen lance 3 is distributed on both sides of the furnace body and is located between the brick lining of the hearth 1 and the copper water jacket 5; the slag outlet 4 is located on the other side of the integrated furnace body and is below the copper water jacket 5 (for discharging slag); the copper water jacket 5 is located in a circle above the hearth 1 (for storing molten slag), and the second-layer lance 6 is inserted through an opening in the middle and lower part of the copper water jacket 5; the third tuyere 7 is located above the steel water jacket 8 (on the membrane wall of the waste heat boiler), and the steel water jacket 8 is located above the first-layer copper water jacket 5.

[0032] Further, the slag outlet is 30 - 50 cm higher than the lead outlet.

[0033] Further, both the first-layer oxygen lance and the second-layer lance are used for injecting pulverized coal and combustible gas.

[0034] Example 2:

[0035] The method for recycling and treating zinc leaching residues using the oxygen-enriched side-blowing smelting and fuming integrated furnace described in Example 1 of the present invention (see Appendix Figure 1 and Appendix Figure 2 ), and the detailed steps are as follows:

[0036] a. The zinc leaching residues, lead paste, flux stone powder and reducing agent coke powder are respectively metered by individual weighing belt scales, and then the four materials are mixed evenly by a granulator to obtain a mixture, and the water content of the obtained mixture is 10%;

[0037] The mass ratio between the zinc leaching residues, lead paste, reducing agent coke powder and flux stone powder is 1:0.5:0.15:0.03, and the slag type is controlled as Fe:SiO2 = 1.5:1, CaO:SiO2 = 0.5:1;

[0038] b. The obtained mixture is sent to the top of the oxygen-enriched side-blowing smelting and fuming integrated furnace through a conveying device and continuously added into the integrated furnace through a feeding port;

[0039] c. Combustible gas enriched with oxygen and pulverized coal are injected into the integrated furnace through two layers of lances distributed on both sides of the integrated furnace for heating, and smelting reaction is carried out with the materials in the furnace, and the smelting temperature is controlled at 1200 - 1250 °C; through the smelting reaction, a crude lead layer (gold, silver, lead, copper, antimony, bismuth in the zinc leaching residues enter the crude lead), matte layer, flue gas and slag layer are produced; the produced matte layer is discharged from the lead outlet together with the crude lead through a siphon port;

[0040] d. During the smelting reaction process, when the slag line of the materials in the integrated furnace rises to 0.8 - 0.9 m, stop adding the mixed materials; by adjusting the oxygen enrichment amount and pulverized coal amount sprayed into the lance, control the oxygen-carbon ratio to 0.7:1 to reduce the lead in the molten slag; then continue to adjust the oxygen enrichment amount and pulverized coal amount sprayed into the lance, control the oxygen-carbon ratio to 1.3:1, raise the temperature to 1180 - 1200 °C, and perform temperature-raising fuming treatment on the zinc oxide contained in the molten slag. After the fuming treatment, secondary zinc oxide is obtained at the tertiary tuyere of the integrated furnace; after the metal recovery in the materials is completed, the waste molten slag in the furnace is discharged through the slag notch.

[0041] e. Recover the waste heat and collect the dust from the flue gas discharged from the smelting reaction to obtain the preliminary dust and the treated flue gas. The treated flue gas is transported to the sulfuric acid production system for sulfuric acid production; a part of the obtained preliminary dust is returned for recycling as smelting raw materials, and the remaining preliminary dust is subjected to re-temperature-raising reduction treatment (control the temperature to 1180 - 1200 °C) to obtain secondary dust, namely secondary zinc oxide dust, for direct external sales or zinc oxide leaching.

[0042] Example 3:

[0043] The method for recycling and treating zinc leaching residue using the oxygen-enriched side-blowing smelting and fuming integrated furnace described in Example 1 of the present invention (see Appendix Figure 1 and Appendix Figure 2 ), and its detailed steps are as follows:

[0044] a. Weigh the zinc leaching residue, lead paste, flux quartz powder, and reducing agent pulverized coal separately by a single weighing belt scale, and then use a granulator to mix the four materials evenly to obtain the mixed materials, and the water content of the obtained mixed materials is 12%;

[0045] The mass ratio between the zinc leaching residue, lead paste, reducing agent coke powder, and flux stone powder is 1:0.5:0.18:0.05, and control the slag type as Fe:SiO2 = 1.7:1, CaO:SiO2 = 0.6:1;

[0046] b. Send the obtained mixed materials to the top of the oxygen-enriched side-blowing smelting and fuming integrated furnace through a conveying device, and continuously add them into the integrated furnace through the feeding port;

[0047] c. Spray the combustible gas oxygen enrichment and pulverized coal into the integrated furnace through two layers of lances distributed on both sides of the integrated furnace for heating, and carry out a smelting reaction with the materials in the furnace, and control the smelting temperature to 1250 - 1300 °C; through the smelting reaction, a crude lead layer (gold, silver, lead, copper, antimony, and bismuth in the zinc leaching residue enter the crude lead), matte layer, flue gas, and slag layer are produced; the produced matte layer is discharged from the lead outlet through the siphon mouth along with the crude lead;

[0048] d. During the smelting reaction process, when the slag line of the materials in the integrated furnace rises to 0.9 - 1.0 m, stop adding the mixed materials; by adjusting the oxygen enrichment amount and pulverized coal amount sprayed into the lance, control the oxygen-carbon ratio to 0.8:1 to reduce the lead in the molten slag; then continue to adjust the oxygen enrichment amount and pulverized coal amount sprayed into the lance, control the oxygen-carbon ratio to 1.4:1, raise the temperature to 1200 - 1220 °C, and perform temperature-raising fuming treatment on the zinc oxide contained in the molten slag. After the fuming treatment, secondary zinc oxide is obtained at the tertiary tuyere of the integrated furnace; after the metal recovery in the materials is completed, the waste molten slag in the furnace is discharged through the slag notch;

[0049] e. Recover the waste heat and collect the dust from the flue gas discharged from the smelting reaction to obtain the preliminary dust and the treated flue gas. The treated flue gas is transported to the sulfuric acid production system for sulfuric acid production; a part of the obtained preliminary dust is returned for recycling as smelting raw materials, and the remaining preliminary dust is subjected to re-temperature-raising reduction treatment (control the temperature at 1180 - 1200 °C) to obtain secondary dust, namely secondary zinc oxide dust, for direct external sales or zinc oxide leaching.

Claims

1. An oxygen-enriched side-blown smelting and fuming integrated furnace, characterized in that: The integrated furnace includes a hearth, a lead tapping port, a first-layer oxygen lance, a slag tapping port, a copper water jacket, a second-layer spray gun, a third tuyere, and a molten steel jacket. The hearth is located at the bottom of the integrated furnace body. The lead tapping port is located on one side of the integrated furnace body and communicates with the bottom of the hearth. The first-layer oxygen lances are distributed on both sides of the furnace body and are located between the hearth lining brick and the copper water jacket. The slag tapping port is located on the other side of the integrated furnace body and is below the copper water jacket. The copper water jacket is located in a circle above the hearth. The second-layer spray gun is inserted through an opening in the middle and lower part of the copper water jacket. The third tuyere is located above the molten steel jacket, and the molten steel jacket is located above the first-layer copper water jacket.

2. The oxygen-enriched side-blowing smelting and fuming integrated furnace according to claim 1, wherein: The slag tapping port is 30 - 50 cm higher than the lead tapping port.

3. The oxygen-enriched side-blown smelting and fuming integrated furnace according to claim 1, wherein: Both the first-layer oxygen lance and the second-layer spray gun are used to inject pulverized coal and combustible gas.

4. A method for recycling and treating zinc leaching residues by using the oxygen-enriched side-blowing smelting and fuming integrated furnace described in claim 1, characterized in that, The method includes the following steps: a. Weigh zinc leaching residue, lead paste, flux, and reductant separately by individual weighing belt scales, and then use a granulator to mix the four materials evenly to obtain a mixed material. b. Send the obtained mixed material to the top of the oxygen-enriched side-blowing smelting and fuming integrated furnace through a conveying device, and continuously add it into the integrated furnace through the feeding port. c. Inject oxygen-enriched combustible gas and pulverized coal into the integrated furnace through two layers of spray guns distributed on both sides of the integrated furnace for heating, and conduct a smelting reaction with the materials in the furnace. After the smelting reaction, a crude lead layer, matte layer, flue gas, and slag layer are produced. The produced matte layer is discharged from the lead tapping port through the siphon with the crude lead. d. During the smelting reaction process, when the slag line of the materials in the integrated furnace rises to 0.8 - 1.2 m, stop adding the mixed material. Control the oxygen-carbon ratio to be 0.6 - 0.8:1 by adjusting the amount of oxygen-enriched gas and pulverized coal injected into the spray gun to reduce the lead in the molten slag. Then continue to adjust the amount of oxygen-enriched gas and pulverized coal injected into the spray gun, control the oxygen-carbon ratio to be 1.3 - 1.5:1, and raise the temperature to 1170 - 1220 °C to conduct temperature-raising fuming treatment on the zinc oxide contained in the molten slag. After the fuming treatment, secondary zinc oxide is obtained at the third tuyere of the integrated furnace. After the metal recovery in the materials is completed, discharge the waste molten slag in the furnace through the slag port. e. Recover the waste heat and collect the dust of the flue gas discharged from the smelting reaction to obtain preliminary dust and treated flue gas. The treated flue gas is transported to the sulfuric acid production system for sulfuric acid production. Part of the obtained preliminary dust is returned for recycling as smelting raw materials, and the remaining preliminary dust is subjected to re-temperature-raising reduction treatment to obtain secondary dust, namely secondary zinc oxide dust, for direct external sales or zinc oxide leaching.

5. The method for recycling and treating zinc smelting slag by using an oxygen-enriched side-blowing smelting and fuming integrated furnace according to claim 4, characterized in that: In step a, the flux is stone powder or quartz sand; the reductant is at least one of coke powder and pulverized coal.

6. The method for recycling and treating zinc smelting slag by using an oxygen-enriched side-blown smelting and fuming integrated furnace according to claim 4, characterized in that: When the zinc leaching residue, lead paste, reductant, and flux are mixed in the granulator in step a, the mass ratio of the zinc leaching residue, lead paste, reductant, and flux is 1:0.5:0.12 - 0.2:0.02 - 0.05, and the slag type is controlled as Fe:SiO2 = 1.3 - 1.8:1, CaO:SiO2 = 0.4 - 0.6:

1.

7. The method for recycling and treating zinc smelting slag by using an oxygen-enriched side-blowing smelting and fuming integrated furnace according to claim 4, characterized in that: In step a, control the moisture content of the obtained mixed material to be 8 - 12%.

8. The method for recycling and treating zinc smelting slag by using an oxygen-enriched side-blowing smelting and fuming integrated furnace according to claim 4, wherein: During the smelting reaction in step c, control the smelting temperature to be 1150 - 1300 °C.

9. The method for recycling and treating zinc smelting slag by using an oxygen-enriched side-blowing smelting and fuming integrated furnace according to claim 4, characterized in that: During the temperature increase and reduction treatment process described in step e, the temperature is controlled at 1170 - 1250 °C.

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