Zinc leaching residue treatment device

Abstract

The utility model provides a zinc leaching residue treatment device which comprises an oxidation furnace, a first gas spray gun hole, a second gas spray gun hole, a second gas spray gun hole, a second gas spray gun hole, a third gas spray gun hole, a fourth gas spray gun hole, a third gas spray gun hole and a fourth gas spray gun hole, the reduction furnace is provided with a liquid molten zinc slag inlet, at least one reducing agent inlet, at least one second fuel spray gun hole, at least one air spray gun hole, a second smelting flue gas outlet, a pig iron outlet and a tailing outlet; the liquid-state molten zinc slag inlet and the liquid-state molten zinc slag outlet are connected through a closed connecting chute; and the pig iron outlet is lower than the tailing outlet. Based on the zinc leaching residue treatment device, the problems that in the prior art, a treatment system is complex, the operation intensity is high, the investment cost is high, the treatment capacity is low, the number of recycled heavy metal elements is small, and the metal recovery rate is low are solved.

Description

Technical Field

[0001] The utility model relates to the field of metallurgy, and in particular to a zinc leaching slag processing device. Background Art

[0002] The zinc smelting method is mainly based on the wet process. The wet zinc smelting produces a large amount of zinc-containing acidic leaching slag (hazardous waste containing many valuable metals), which needs to be harmlessly disposed of and valuable metals recovered. At present, the zinc leaching slag treatment processes mainly include rotary kiln process (Weltz process), top blowing process and fuming furnace process. The main disadvantages of the rotary kiln process are that it is difficult to recover heavy metals (silver recovery rate is less than 25%), the kiln ring cleaning labor intensity is high, the operation rate is low (<85%), and the operating environment is poor; the main disadvantages of the top blowing furnace process are complex system and high investment; the fuming furnace process mainly has the disadvantages of short water jacket life, low processing capacity during full cold material processing, and the product zinc oxide smoke needs further defluorination and chlorination; although the top blowing furnace process and the fuming furnace process can recover heavy metals, the heavy metal recovery rate is still low, and metallic iron cannot be recovered. Utility Model Content

[0003] The main purpose of the utility model is to provide a zinc leaching slag processing device to solve the problems in the prior art of complex processing system, high operation intensity, high investment cost, low processing capacity, few types of heavy metal elements recovered and low recovery rate.

[0004] In order to achieve the above object, according to one aspect of the utility model, a zinc leaching slag processing device is provided, and the zinc leaching slag processing device comprises:

[0005] An oxidation furnace, wherein the oxidation furnace is provided with a mixture inlet, at least one oxygen-enriched gas spray gun hole, at least one first fuel spray gun hole, a liquid molten zinc slag outlet and a first smelting fume outlet;

[0006] The reduction furnace is provided with a liquid molten zinc slag inlet, at least one reducing agent inlet, at least one second fuel spray gun hole, at least one air spray gun hole, a second smelting fume outlet, a pig iron outlet and a tailings outlet; the liquid molten zinc slag inlet and the liquid molten zinc slag outlet are connected by a closed connecting chute; the pig iron outlet is lower than the tailings outlet.

[0007] Further, the reducing agent inlet includes a reducing agent feeding port and at least one reducing agent spray gun hole.

[0008] Furthermore, each oxygen-rich gas spray gun hole and each first fuel spray gun hole are respectively arranged on the side of the oxidation furnace.

[0009] Furthermore, the zinc leaching slag processing device further comprises: a mixing unit, the mixing unit is provided with a zinc leaching slag inlet, a flux inlet and a mixture outlet, and the mixture outlet is connected to the mixture inlet; and / or,

[0010] A secondary combustion air port is arranged at the upper part of the furnace of the reduction furnace.

[0011] Furthermore, the zinc leaching slag treatment device also includes a first waste heat boiler, a first dust collecting device and an acid making system. The first waste heat boiler is provided with a first smelting fume inlet, a first recovery fume outlet and a first boiler dust outlet. The first dust collecting device is provided with a first recovery fume inlet, a first dust removal fume outlet and a first fume dust outlet. The first smelting fume inlet is connected to the first smelting fume outlet, the first recovery fume outlet is connected to the first recovery fume inlet, and the first dust removal fume outlet is connected to the fume inlet of the acid making system.

[0012] Furthermore, the zinc leaching slag treatment device also includes a second waste heat boiler, a second dust collecting device and a desulfurization and denitrification tail gas treatment system. The second waste heat boiler is provided with a second smelting flue gas inlet, a second recovered flue gas outlet and a second boiler dust outlet. The second dust collecting device is provided with a second recovered flue gas inlet, a second dust removal flue gas outlet and a second dust outlet. The second smelting flue gas inlet is connected to the second smelting flue gas outlet, the second recovered flue gas outlet is connected to the second recovered flue gas inlet, and the second dust removal flue gas outlet is connected to the flue gas inlet of the desulfurization and denitrification tail gas treatment system.

[0013] Furthermore, the zinc leaching slag treatment device also includes a gas treatment device, and the gas outlet of the desulfurization and denitrification tail gas treatment system is connected to the gas storage device.

[0014] Furthermore, the zinc leaching slag treatment device also includes a leaching device of a wet leaching process, which is used to perform leaching treatment on materials flowing out of the first boiler dust outlet, the first smoke dust outlet, the second boiler dust and the second smoke dust outlet.

[0015] Furthermore, the first dust collecting device is an electric dust collecting device, and the second dust collecting device is a bag dust collector.

[0016] Furthermore, the zinc leaching slag treatment device also includes a pig iron refining device for refining the pig iron flowing out of the pig iron outlet.

[0017] By applying the technical scheme of the utility model, zinc leaching slag, flux, first fuel and oxygen-rich gas are subjected to oxidation smelting in an oxidation furnace to obtain liquid molten high-zinc slag and first smelting flue gas, and then a second fuel and air are used to participate in combustion and heat supply, and the liquid molten high-zinc slag and a reducing agent are subjected to reduction smelting in a reduction furnace to obtain second smelting flue gas and pig iron and tailings that are easy to be separated by standing, thereby realizing the recovery of metallic iron and obtaining a higher iron recovery rate; wherein, heavy metals zinc, lead, silver, indium and germanium are successively separated from the first smelting flue gas and the second smelting flue gas, so that subsequent recovery obtains a higher recovery rate of zinc, lead, silver, indium and germanium, thereby making the content of each metal in the waste tailings extremely low, avoiding the generation of hazardous waste slag, and being environmentally friendly.

[0018] By using the above device to treat zinc leaching slag, a higher recovery rate of iron, zinc, lead, silver, indium and germanium can be obtained, and the comprehensive recovery of multiple elements (Zn / Pb / Ag / In / Ge / Fe) in zinc leaching slag and the harmless treatment of zinc leaching slag can be achieved. The device is easy to operate, environmentally friendly, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 A schematic structural diagram of a zinc leaching slag treatment device according to an embodiment of the utility model is shown;

[0021] Figure 2 A schematic diagram of a process of treating zinc leaching slag using a zinc leaching slag treating device according to an embodiment of the utility model is shown;

[0022] Figure 3 A schematic diagram of a process for treating zinc leaching slag using a zinc leaching slag treatment device according to another embodiment of the utility model is shown.

[0023] The above drawings include the following reference numerals:

[0024] 1. Oxidation furnace; 11. Mixed material inlet; 12. Oxygen-enriched gas spray gun hole; 13. First fuel spray gun hole; 14. Liquid molten zinc slag outlet; 15. First smelting fume outlet;

[0025] 2. Reduction furnace; 21. Liquid molten zinc slag inlet; 22. Air spray gun hole; 23. Second smelting fume outlet; 24. Pig iron outlet; 25. Tailings outlet; 26. Reductant feeding port; 27. Reductant spray gun hole; 28. Second fuel spray gun hole;

[0026] 3. Closed connection chute;

[0027] 4. First waste heat boiler; 41. First smelting flue gas inlet; 42. First recovered flue gas outlet;

[0028] 5. The first dust collecting device; 51. The first flue gas recovery inlet;

[0029] 6. Second waste heat boiler; 61. Second smelting flue gas inlet; 62. Second recovered flue gas outlet;

[0030] 7. The second dust collecting device; 71. The second flue gas recovery inlet. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] As described in the background technology, the prior art has the problems of complex processing system, high operation intensity, high investment cost, low processing capacity, few types of heavy metal elements recovered and low recovery rate. In order to solve the above problems, according to one aspect of the utility model, a zinc leaching slag processing device is provided, such as Figure 1 As shown, an oxidation furnace 1 is provided with a mixture inlet 11, at least one oxygen-rich gas spray gun hole 12, at least one first fuel spray gun hole 13, a liquid molten zinc slag outlet 14 and a first smelting fume outlet 15; a reduction furnace 2 is provided with a liquid molten zinc slag inlet 21, at least one reducing agent inlet, at least one second fuel spray gun hole 28, at least one air spray gun hole 22, a second smelting fume outlet 23, a pig iron outlet 24 and a tailings outlet 25; the liquid molten zinc slag inlet 21 and the liquid molten zinc slag outlet 14 are connected by a closed connecting chute 3; the pig iron outlet 24 is lower than the tailings outlet 25. The zinc leaching slag is oxidized and smelted in the oxidation furnace 1 to produce liquid molten zinc slag and the first smelting flue gas. The liquid molten zinc slag enters the reduction furnace 2 through the closed connection chute 3. The heat of the liquid molten zinc slag is fully utilized with high thermal efficiency. The liquid molten zinc slag is reduced in the reduction furnace 2 to generate pig iron and tailings that are easy to stand and separate. Under the action of high temperature and gravity clarification, a pig iron layer at the bottom and a tailings layer at the top are formed, and flow out from the pig iron outlet 24 and the tailings outlet 25 respectively. The first smelting flue gas escapes from the first smelting flue gas outlet 15. In actual application, zinc leaching slag, flux, first fuel and oxygen-rich gas are oxidized and smelted in oxidation furnace 1 to obtain liquid molten high-zinc slag and first smelting flue gas, and then second fuel and air are used to participate in combustion and heat supply, and liquid molten high-zinc slag and reducing agent are reduced and smelted in reduction furnace 2 to obtain second smelting flue gas and pig iron and tailings that are easy to stand and separate, so as to realize the recovery of metallic iron and obtain a higher iron recovery rate; wherein zinc, lead, silver, indium and germanium are successively separated from the first smelting flue gas and the second smelting flue gas, so that subsequent recovery obtains a higher recovery rate of zinc, lead, silver, indium and germanium, so that the content of each metal in the waste tailings is extremely low, avoiding the generation of hazardous waste slag, and being environmentally friendly. By using the above method to treat zinc leaching slag, a higher recovery rate of iron, zinc, lead, silver, indium and germanium can be obtained, and the comprehensive recovery of multiple elements in zinc leaching slag (Zn / Pb / Ag / In / Ge / Fe) can be achieved. The zinc leaching slag can also be harmlessly treated, and the operation is convenient, environmentally friendly and has broad application prospects.

[0033] The reduction furnace 2 is responsible for deep reduction and fuming volatilization. In a preferred embodiment, the reducing agent inlet includes a reducing agent feeding port 26 and at least one reducing agent spray gun hole 27 to improve the reduction efficiency of the device.

[0034] In a preferred embodiment, the reducing agent spray gun holes 27 are respectively located on the sides of the reduction furnace 2 to further improve the reduction efficiency.

[0035] The oxidation furnace 1 is responsible for oxygen-enriched melting and desulfurization, which melts the zinc leaching slag into liquid molten zinc slag and completes desulfurization. In a preferred embodiment, each oxygen-enriched gas spray gun hole 12 and each first fuel spray gun hole 13 are respectively arranged on the side of the oxidation furnace 1, so that the exhaust gas in the smelting process can be fully burned, the temperature and combustion efficiency in the furnace are improved, the metal is melted as quickly as possible, and energy consumption and environmental pollution are reduced; the oxidation furnace 1 is preferably a side-blown submerged combustion furnace, which uses a spray gun to blow oxygen and the first fuel from the side, and submerged combustion in the furnace is used to achieve heating for melting the zinc leaching slag. The use of a side-blown submerged combustion furnace can improve the thermal efficiency and the SO2 concentration in the sulfur-containing flue gas, which is beneficial to recover the sulfur element in the flue gas for acid production.

[0036] In a preferred embodiment, the zinc leaching slag processing device further includes: a mixing unit, the mixing unit is provided with a zinc leaching slag inlet, a flux inlet and a mixture outlet (not shown), and the mixture outlet is connected to the mixture inlet 11, thereby, the zinc leaching slag and the flux are fully mixed by the mixing unit, and then supplied to the oxidation furnace 1 for oxidation smelting, so as to efficiently and fully generate liquid molten zinc slag.

[0037] In a preferred embodiment, a secondary combustion air port is provided at the upper portion of the furnace of the reduction furnace so that the combustible gas at the upper portion of the furnace can be burned in time, thereby improving the safety of the device operation. At the same time, the air blown in facilitates the accelerated oxidation of the metal in the flue gas to form metal oxides for subsequent recovery.

[0038] In order to make full use of waste heat and realize resource utilization of materials, in a preferred embodiment, the zinc leaching slag treatment device also includes a first waste heat boiler 4, a first dust collecting device 5 and an acid making system. The first waste heat boiler 4 is provided with a first smelting fume inlet 41, a first recovery fume outlet 42 and a first boiler dust outlet. The first dust collecting device 5 is provided with a first recovery fume inlet 51, a first dust removal fume outlet and a first fume dust outlet. The first smelting fume inlet 41 is connected to the first smelting fume outlet 15, the first recovery fume outlet 42 is connected to the first recovery fume inlet 51, and the first dust removal fume outlet is connected to the fume inlet of the acid making system.

[0039] In a preferred embodiment, the zinc leaching slag treatment device also includes a second waste heat boiler 6, a second dust collecting device 7 and a desulfurization and denitrification tail gas treatment system. The second waste heat boiler 6 is provided with a second smelting flue gas inlet 61, a second recovery flue gas outlet 62 and a second boiler dust outlet. The second dust collecting device 7 is provided with a second recovery flue gas inlet 71, a fourth flue gas outlet and a second flue dust outlet. The second smelting flue gas inlet 61 is connected to the second smelting flue gas outlet 23, the second recovery flue gas outlet 62 is connected to the second recovery flue gas inlet 71, and the second dust removal flue gas is connected to the flue gas inlet of the desulfurization and denitrification tail gas treatment system.

[0040] In a preferred embodiment, the zinc leaching slag treatment device further includes a coal gas treatment device, and the gas outlet of the desulfurization and denitrification tail gas treatment system is connected to a coal gas storage device (not shown).

[0041] In a preferred embodiment, the leached slag treatment device also includes a leaching device (not shown) of a wet leaching process for leaching materials flowing out of the first boiler dust outlet, the first smoke dust outlet, the second boiler dust and the second smoke dust outlet.

[0042] In a preferred embodiment, the first dust collecting device 5 is an electric dust collecting device, and the second dust collecting device 7 is a bag dust collector. There is less dust in the first smelting flue gas and the CO gas content is low. In the dust removal stage, electric dust removal is selected, and the dust removal effect is good and will not explode. When a carbonaceous reducing agent is used, a large amount of CO gas will inevitably exist in the reduction furnace 2, and the zinc (in the form of zinc oxide) in the zinc leaching slag mainly exists in the first smelting flue gas, resulting in a large amount of dust in the second smelting flue gas. The use of a bag dust collector is safer and has a higher dust collection efficiency.

[0043] In a preferred embodiment, the zinc leaching slag processing device further includes a pig iron refining device (not shown) for refining the pig iron flowing out of the pig iron outlet 24 .

[0044] The utility model provides a method for treating zinc leaching slag, such as Figure 2 As shown, the process comprises the following steps: step S1, oxidizing and smelting zinc leaching slag, flux, oxygen-rich gas and a first fuel in an oxidation furnace 1 to obtain liquid molten zinc slag and a first smelting fume, and the oxidizing and smelting temperature in the oxidation furnace 1 is 1150-1600°C; step S2, reducing and smelting the liquid molten zinc slag, a reducing agent, a second fuel and air in a reduction furnace 2 to obtain a second smelting fume, pig iron and tailings, and the smelting temperature in the reduction furnace 2 is 1200-1600°C.

[0045] In the oxidation smelting stage, the main purpose is to melt and desulfurize the zinc leaching slag. Finally, the zinc element is concentrated in the liquid molten zinc slag, and the sulfur element, lead, silver, indium, germanium and a small amount of zinc enter the first smelting flue gas. In order to avoid high energy consumption, reduce the loss of the oxidation furnace 1, and obtain liquid molten zinc slag with a high zinc content, in a preferred embodiment, the oxidation smelting temperature in the oxidation furnace 1 is 1250-1400°C; in the reduction smelting stage, the reduction of zinc, iron, lead, silver, indium and germanium mainly occurs. The zinc metal and lead, silver, indium and germanium metal reduced by the reduction furnace 2 enter the second smelting flue gas for separation, and the iron is separated in the form of pig iron. The smelting temperature in the reduction furnace 2 is preferably 1300-1500°C. While avoiding high energy consumption and reducing the loss of the reduction furnace 2, a higher recovery rate of zinc, iron, lead, silver, indium and germanium is obtained.

[0046] In a preferred embodiment, the flux is selected from at least one of quartz, limestone, and dolomite, and the above raw materials are widely available and low in cost. The melting process of zinc leaching slag requires a large amount of heat energy, and the heat for melting the zinc leaching slag is provided by supplying oxygen-enriched gas and the first fuel into the oxidation furnace 1, wherein oxygen mainly plays a role in combustion support. In addition, oxygen is blown into an oxidizing atmosphere, which is beneficial to avoid the reduction and precipitation of heavy metal elements such as lead, silver, indium, and germanium at this stage. In order to obtain liquid molten zinc slag with high zinc content and a higher recovery rate of lead, silver, indium, and germanium, the oxygen-enriched gas is preferably oxygen-enriched air, and the oxygen concentration in the oxygen-enriched air is 30-90% by volume, and more preferably, the oxygen concentration is 50-80%; the first fuel and The second fuel is independently selected from at least one of natural gas, coal gas or pulverized coal, with a wide source of raw materials and low cost; the zinc content in the liquid molten zinc slag is preferably not less than 10wt% so as to have a higher reduction recovery value; the reducing agent is preferably selected from at least one of a carbonaceous reducing agent and a ferrosilicon reducing agent, more preferably the reducing agent is a carbonaceous reducing agent, and further preferably the carbonaceous reducing agent is selected from at least one of pulverized coal, anthracite, bituminous coal and coke. The use of the above-mentioned carbonaceous reducing agents has low production costs; the mass ratio of zinc leaching slag and flux is preferably: (70-80): (20-30); the mass ratio of liquid molten zinc slag and reducing agent is preferably (70-80): (30-40) so as to obtain a higher recovery rate of iron and zinc.

[0047] In a preferred embodiment, in step S2, a part of the reducing agent is sprayed into the reduction furnace 2 through the spray gun hole, and the other part of the reducing agent is added through the feeding port on the reduction furnace 2, so that the metal in the liquid molten zinc slag is fully reduced in the reduction furnace 2, thereby improving the reduction efficiency; preferably, step S2 also includes: in the process of reduction smelting, blowing air to the upper part of the furnace of the reduction furnace 2 for secondary combustion, thereby, zinc and other metals reduced by the reduction furnace 2 enter the flue gas, and then are accelerated to be oxidized into metal oxides by the secondary air blown in, and exist in the first smelting flue gas in the form of metal oxides, avoiding precipitation in the form of metals at this stage.

[0048] In a preferred embodiment, Figure 3As shown, step S1 also includes: supplying the first smelting flue gas to the first waste heat boiler 4 for waste heat recovery to obtain the first recovered flue gas and the first boiler dust, supplying the first recovered flue gas to the first dust collecting device 5 for dust removal to obtain the first dust-removed flue gas and the first flue dust, and supplying the first dust-removed flue gas to the acid making system for acid making; the high-temperature first smelting flue gas (containing elements such as S, F, Cl, As, Cd, etc.) generated by the oxidation furnace 1 is passed through the first waste heat boiler 4 to generate the first boiler dust and the medium-low temperature first recovered flue gas, and at the same time, the first waste heat boiler 4 recovers the waste heat of the first recovered flue gas to produce steam or hot water for waste heat power generation or production and life, so as to make full use of the waste heat, and the first recovered flue gas is dusted through the first dust collecting device 5 to obtain the first dust-removed flue gas. The first dust-removed flue gas is sent to the acid-making system for treatment, wherein SO2 in the first dust-removed flue gas is processed by the acid-making system to realize the resource utilization of sulfur, and elements such as F, Cl, As, and Cd are removed as waste acid after being processed by the acid-making system, which can reduce the pressure and adverse effects on the subsequent leaching treatment system; the preferred step S2 also includes: supplying the second smelting flue gas to the second waste heat boiler 6 for waste heat recovery to obtain the second recovered flue gas and the second boiler dust, supplying the second recovered flue gas to the second dust collecting device 7 for dust removal to obtain the second dust-removed flue gas and the second flue dust, and supplying the second dust-removed flue gas to the desulfurization and denitrification tail gas treatment system for treatment to obtain coal gas; more preferably, the coal gas is supplied to the coal gas storage device, and the reduction furnace 2 is deep The metals are recovered by smelting through reduction, and a large amount of coal gas is generated in the process, which is stored in a coal gas storage device for use as fuel, thereby improving resource utilization. A more preferred zinc leaching slag treatment method further comprises: supplying the first boiler dust, the first smoke dust, the second smoke dust and the second boiler dust to a leaching device of a wet leaching process; in the oxidation smelting process, lead, silver, indium, germanium and a small amount of zinc in the first smelting smoke exist in the first smelting smoke in the form of metal oxides, and after being treated by the first waste heat boiler 4 and the first dust collecting device 5, the metal oxides enter the first boiler dust and the first smoke dust respectively; in the reduction smelting, lead, silver, indium, germanium and a large amount of zinc in the first smelting smoke escape from the high-temperature melt in the form of metal, and due to subsequent treatment such as the waste heat boiler, the high-temperature melt is molten. The treatment device performs subsequent waste heat recovery, dust collection or acid production treatment. The reduction furnace 2 is in a micro-negative pressure environment. Due to the existence of the micro-negative pressure environment and the non-sealed conditions, external air enters the reduction furnace 2, boiler and pipeline, and metals such as zinc are oxidized to form metal oxides, which exist in the second smelting flue gas in the form of metal oxides. After being treated by the second waste heat boiler 6 and the second dust collecting device 7, the metal oxides enter the second boiler dust and the second flue dust respectively, and the first boiler dust, the first flue dust, the second flue dust and the second boiler dust are supplied together to the leaching device of the wet leaching process to recover each metal respectively; the preferred step S2 also includes supplying pig iron to the pig iron refining device, so that the produced pig iron can be further refined to improve the product purity in addition to being directly sold. It should be noted that the acid production operation, the leaching operation and the pig iron refining operation are conventional operations in the prior art and will not be repeated here.

[0049] The present application is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in the present application.

[0050] Example 1

[0051] A method for treating zinc leaching slag comprises the following steps:

[0052] (1) zinc leaching slag, quartz, limestone and dolomite are batched and mixed in a mass ratio of 75:10:10:5 to obtain a mixture, the obtained mixture is added into an oxidation furnace 1, and oxygen-enriched air and natural gas are sprayed into the oxidation furnace 1 for oxidation smelting to obtain liquid molten zinc slag and a first smelting flue gas, the smelting temperature in the oxidation furnace 1 is 1350° C., wherein the oxygen concentration in the oxygen-enriched air is 60% by volume; the first smelting flue gas is supplied to a first waste heat boiler 4 for waste heat recovery to obtain a first recovered flue gas and a first boiler dust, the first recovered flue gas is supplied to a first dust collecting device 5 for dust removal to obtain a first dust-removed flue gas and a first flue dust, the first dust-removed flue gas is supplied to an acid-making system for acid-making, and the first flue dust and the first boiler dust are supplied together to a leaching device for a wet leaching process to recover lead, silver, indium, germanium and zinc therein.

[0053] (2) The obtained liquid molten zinc slag is supplied to the reduction furnace 2, and coke is added into the reduction furnace 2 according to the mass ratio of the liquid molten zinc slag to coke of 75:34, and natural gas and air are sprayed into the reduction furnace 2 for reduction smelting to obtain second smelting flue gas, pig iron and tailings. The smelting temperature of the reduction furnace 2 is 1500°C; the second smelting flue gas is supplied to the second waste heat boiler 6 for waste heat recovery to obtain second recovered flue gas and second boiler dust, and the second recovered flue gas is supplied to the second dust collecting device 7 for dust removal to obtain second dust-removed flue gas and second flue dust, and the second dust-removed flue gas is supplied to the sulfur denitrification tail gas treatment system for treatment and then stored in the gas storage device, and the second flue dust and the second boiler dust are supplied together to the leaching device of the wet leaching process to recover the lead, silver, indium, germanium and zinc therein.

[0054] Example 2

[0055] A method for treating zinc leaching slag comprises the following steps:

[0056] (1) zinc leaching slag, quartz, limestone and dolomite are batched and mixed in a mass ratio of 70:5:10:5 to obtain a mixture, the obtained mixture is added into an oxidation furnace 1, and oxygen-enriched air and coal gas are sprayed into the oxidation furnace 1 for oxidation smelting to obtain liquid molten zinc slag and a first smelting flue gas, the smelting temperature in the oxidation furnace 1 is 1250° C., wherein the oxygen concentration in the oxygen-enriched air is 30% by volume; the first smelting flue gas is supplied to a first waste heat boiler 4 for waste heat recovery to obtain a first recovered flue gas and a first boiler dust, the first recovered flue gas is supplied to a first dust collecting device 5 for dust removal to obtain a first dust-removed flue gas and a first flue dust, the first dust-removed flue gas is supplied to an acid-making system, and the first flue dust and the first boiler dust are supplied together to a leaching device of a wet leaching process to recover lead, silver, indium, germanium and zinc therein.

[0057] (2) The obtained liquid molten zinc slag is supplied to the reduction furnace 2, and pulverized coal is added into the reduction furnace 2 according to the mass ratio of the liquid molten zinc slag to pulverized coal of 70:30, and coal gas and air are sprayed into the reduction furnace 2 for reduction smelting to obtain second smelting flue gas, pig iron and tailings gas. The smelting temperature of the reduction furnace 2 is 1300°C; the second smelting flue gas is supplied to the second waste heat boiler 6 for waste heat recovery to obtain second recovered flue gas and second boiler dust, and the second recovered flue gas is supplied to the second dust collecting device 7 for dust removal to obtain second dust-removed flue gas and second flue dust, and the second dust-removed flue gas is supplied to the sulfur denitrification tail gas treatment system for treatment and then stored in the coal gas storage device, and the second flue dust and the second boiler dust are supplied together to the leaching device of the wet leaching process to recover the lead, silver, indium, germanium and zinc therein.

[0058] Example 3

[0059] A method for treating zinc leaching slag comprises the following steps:

[0060] (1) zinc leaching slag, quartz, limestone and dolomite are batched and mixed in a mass ratio of 80:5:15:10 to obtain a mixture, the obtained mixture is added into an oxidation furnace 1, and oxygen-enriched air and natural gas are sprayed into the oxidation furnace 1 for oxidation smelting to obtain liquid molten zinc slag and a first smelting flue gas, the smelting temperature in the oxidation furnace 1 is 1400° C., wherein the oxygen concentration in the oxygen-enriched air is 90% by volume; the first smelting flue gas is supplied to a first waste heat boiler 4 for waste heat recovery to obtain a first recovered flue gas and a first boiler dust, the first recovered flue gas is supplied to a first dust collecting device 5 for dust removal to obtain a first dust-removed flue gas and a first flue dust, the first dust-removed flue gas is supplied to an acid-making system for acid-making, and the first flue dust and the first boiler dust are supplied together to a leaching device for a wet leaching process to recover lead, silver, indium, germanium and zinc therein.

[0061] (2) The obtained liquid molten zinc slag is supplied to the reduction furnace 2, and coke is added into the reduction furnace 2 according to the mass ratio of the liquid molten zinc slag to coke of 80:40, and natural gas and air are sprayed into the reduction furnace 2 for reduction smelting to obtain second smelting flue gas, pig iron and tailings. The smelting temperature of the reduction furnace 2 is 1500°C; the second smelting flue gas is supplied to the second waste heat boiler 6 for waste heat recovery to obtain second recovered flue gas and second boiler dust, and the second recovered flue gas is supplied to the second dust collecting device 7 for dust removal to obtain second dust-removed flue gas and second flue dust, and the second dust-removed flue gas is supplied to the sulfur denitrification tail gas treatment system for treatment and then stored in the gas storage device, and the second flue dust and the second boiler dust are supplied together to the leaching device of the wet leaching process to recover the lead, silver, indium, germanium and zinc therein.

[0062] Example 4

[0063] (1) zinc leaching slag, quartz, limestone and dolomite are batched and mixed in a mass ratio of 70:5:10:5 to obtain a mixture, the obtained mixture is added into an oxidation furnace 1, and oxygen-enriched air and pulverized coal are sprayed into the oxidation furnace 1 for oxidation smelting to obtain liquid molten zinc slag and a first smelting flue gas, the smelting temperature in the oxidation furnace 1 is 1150° C., wherein the oxygen concentration in the oxygen-enriched air is 30%; the first smelting flue gas is supplied to a first waste heat boiler 4 for waste heat recovery to obtain a first recovered flue gas and a first boiler dust, the first recovered flue gas is supplied to a first dust collecting device 5 for dust removal to obtain a first dust-removed flue gas and a first flue dust, the first dust-removed flue gas is supplied to an acid-making system for acid-making, and the first flue dust and the first boiler dust are supplied together to a leaching device of a wet leaching process to recover lead, silver, indium, germanium and zinc therein.

[0064] (2) The obtained liquid molten zinc slag is supplied to the reduction furnace 2, and pulverized coal is added into the reduction furnace 2 according to the mass ratio of the liquid molten zinc slag to pulverized coal of 70:30, and natural gas and air are sprayed into the reduction furnace 2 for reduction smelting to obtain second smelting flue gas, pig iron and tailings. The smelting temperature of the second reduction furnace 2 is 1200°C; the second smelting flue gas is supplied to the second waste heat boiler 6 for waste heat recovery to obtain second recovered flue gas and second boiler dust, and the second recovered flue gas is supplied to the second dust collecting device 7 for dust removal to obtain second dust-removed flue gas and second flue dust, and the second dust-removed flue gas is supplied to the sulfur denitrification tail gas treatment system for treatment and then stored in the gas storage device, and the second flue dust and the second boiler dust are supplied together to the leaching device of the wet leaching process to recover the lead, silver, indium, germanium and zinc therein.

[0065] Comparative Example 1

[0066] The difference from Example 1 is that the smelting temperature in the oxidation furnace 1 in step (1) is 1050°C, and the smelting temperature in the reduction furnace 2 in step (2) is 1050°C.

[0067] The recovery rates of zinc, iron, lead, silver, indium and germanium in the zinc leaching slag in Examples 1-3 and Comparative Example 1 (i.e., the total recovered mass of the four metals and the total mass of the four metals in the zinc leaching slag) are shown in Table 1.

[0068] Table 1

[0069] Zinc recovery rate (%) Iron recovery rate (%) Recovery rate of lead, silver, indium and germanium (%) Example 1 99.5 98.5 99.3 Example 2 99.1 96.8 98.6 Example 3 98.8 90.5 97.5 Example 4 98.5 85.6 95.8 Comparative Example 1 89.8 / 80.5

[0070] From the above description, it can be seen that Examples 1-4 achieve high recovery rates of iron, zinc, lead, silver, indium, germanium, etc.; in Comparative Example 1, because the oxidation smelting and reduction smelting temperatures are too low, the generation of the target liquid molten zinc slag in the oxidation furnace, the high-temperature first smelting flue gas, and the metal reduction in the reduction furnace and the generation of the high-temperature second smelting flue gas are affected. Therefore, the recovery rate of each element in Comparative Example 1 is significantly lower than that in Examples 1-4, and the iron in the zinc leaching slag cannot be recovered, resulting in that almost all of the iron remains in the tailings. The zinc leaching slag treatment method provided by the utility model separates and recovers iron as pig iron and obtains a higher recovery rate, and zinc, lead, silver, indium, and germanium are separated from the first smelting flue gas and the second smelting flue gas and separated and recovered by the leaching process, and finally obtains a higher recovery rate of zinc, lead, silver, indium, and germanium heavy metals, and the content of iron, zinc, lead, silver, indium, and germanium in the waste tailings is extremely low, thereby avoiding the generation of hazardous waste slag, being environmentally friendly, and having good application prospects.

[0071] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A zinc leaching slag treatment device, characterized in that: The zinc leaching slag treatment device includes: An oxidation furnace (1), wherein the oxidation furnace (1) is provided with a mixed material inlet (11), at least one oxygen-enriched gas spray gun hole (12), at least one first fuel spray gun hole (13), a liquid molten zinc slag outlet (14) and a first smelting fume outlet (15); A reduction furnace (2), wherein the reduction furnace (2) is provided with a liquid molten zinc slag inlet (21), at least one reducing agent inlet, at least one second fuel spray gun hole (28), at least one air spray gun hole (22), a second smelting fume outlet (23), a pig iron outlet (24) and a tailings outlet (25); the liquid molten zinc slag inlet (21) and the liquid molten zinc slag outlet (14) are connected via a closed connection chute (3); the pig iron outlet (24) is lower than the tailings outlet (25).

2. The zinc leaching slag treatment device according to claim 1, characterized in that: The reducing agent inlet includes a reducing agent feeding port (26) and at least one reducing agent spray gun hole (27).

3. The zinc leaching slag treatment device according to claim 1, characterized in that: Each of the oxygen-rich gas spray gun holes (12) and each of the first fuel spray gun holes (13) are respectively arranged on the side of the oxidation furnace (1).

4. The zinc leaching slag treatment device according to claim 1, characterized in that: The zinc leaching slag processing device further comprises: a mixing unit, the mixing unit being provided with a zinc leaching slag inlet, a flux inlet and a mixture outlet, the mixture outlet being connected to the mixture inlet (11); and / or a secondary combustion tuyere being provided at the upper part of the furnace of the reduction furnace (2).

5. The zinc leaching slag treatment device according to any one of claims 1 to 4, characterized in that: The zinc leaching slag treatment device further comprises a first waste heat boiler (4), a first dust collecting device (5) and an acid-making system, wherein the first waste heat boiler (4) is provided with a first smelting fume inlet (41), a first recovery fume outlet (42) and a first boiler dust outlet, and the first dust collecting device (5) is provided with a first recovery fume inlet (51), a first dust removal fume outlet and a first fume dust outlet, wherein the first smelting fume inlet (41) is connected to the first smelting fume outlet (15), the first recovery fume outlet (42) is connected to the first recovery fume inlet (51), and the first dust removal fume outlet is connected to the fume inlet of the acid-making system.

6. The zinc leaching slag treatment device according to claim 5, characterized in that: The zinc leaching slag treatment device also includes a second waste heat boiler (6), a second dust collecting device (7) and a desulfurization and denitrification tail gas treatment system, wherein the second waste heat boiler (6) is provided with a second smelting fume inlet (61), a second recovery fume outlet (62) and a second boiler dust outlet, and the second dust collecting device (7) is provided with a second recovery fume inlet (71), a second dust removal fume outlet and a second fume dust outlet, the second smelting fume inlet (61) is connected to the second smelting fume outlet (23), the second recovery fume outlet (62) is connected to the second recovery fume inlet (71), and the second dust removal fume outlet is connected to the fume inlet of the desulfurization and denitrification tail gas treatment system.

7. The zinc leaching slag treatment device according to claim 6, characterized in that: The zinc leaching slag processing device also includes a coal gas processing device, and the gas outlet of the desulfurization and denitrification tail gas processing system is connected to the coal gas storage device.

8. The zinc leaching slag treatment device according to claim 6, characterized in that: The zinc leaching slag treatment device also includes a leaching device of a wet leaching process, which is used to perform leaching treatment on materials flowing out of the first boiler dust outlet, the first smoke dust outlet, the second boiler dust and the second smoke dust outlet.

9. The zinc leaching slag treatment device according to claim 6, characterized in that: The first dust collecting device (5) is an electric dust collecting device, and the second dust collecting device (7) is a bag dust collector.

10. The zinc leaching slag treatment device according to claim 6, characterized in that: The zinc leaching slag treatment device also includes a pig iron refining device for refining the pig iron flowing out of the pig iron outlet (24).

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