CN111979422A - Method for comprehensively recovering valuable metals in goethite slag - Google Patents
Method for comprehensively recovering valuable metals in goethite slag Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B58/00—Obtaining gallium or indium
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Abstract
The invention provides a method for comprehensively recovering valuable metals in goethite slag, which comprises the following steps of: levigating goethite slag, and mixing the goethite slag: a chlorine-containing salt: carbon powder 1: 0.05-1.0: proportioning materials according to the mass ratio of 0.05-1.0; uniformly mixing the ingredients, and pelletizing, wherein the diameter of the pellets is 10-20 mm; roasting and volatilizing for 1-6 h at 500-1100 ℃; collecting zinc and indium containing dust generated in the volatilization process, and obtaining roasted calcine. After the reaction is finished, cooling the roasted calcine to room temperature, and then grinding the ore until the granularity is-200 meshes. And carrying out magnetic separation on the ground material, wherein the magnetic field intensity is 160-350 mT, and obtaining an iron ore concentrate product. The method provided by the invention can realize the high-efficiency volatilization recovery of the valuable metals zinc and indium in the goethite slag under the low-temperature thermal field, and the valuable metals zinc and indium are coupled with the magnetic field to obtain the iron ore concentrate product, and the method has the characteristics of high valuable metal recovery rate, simple and convenient operation, low energy consumption and the like.
Description
Technical Field
The invention relates to comprehensive recovery of valuable metals zinc indium iron in goethite slag, in particular to a method for comprehensively recovering valuable metals in goethite slag.
Background
In the hydrometallurgical process of zinc, especially the zinc oxygen pressure leaching process, iron is leached into solution as an impurity element together with zinc. Iron is a foreign ion, and if the concentration of iron in the solution is greater than 20mg/L, it affects the zinc electrodeposition efficiency, increases the power consumption of the electrodeposition process, and poses serious hazards, and thus it needs to be economically and efficiently removed before electrodeposition. At present, the method for removing iron from the solution mainly includes jarosite method, goethite method, hematite method and the like. The goethite method is a more common iron removal method in the zinc smelting industry, and has the advantages of complete precipitation, small slag amount, good iron slag filterability and the like, but has the outstanding problems of difficult control of iron slag crystal form mixing, low iron content (35-45%) of iron slag, high zinc content (8-15%) of iron slag, difficult recycling and the like.
At present, the treatment of the ferrosilicon slag is generally carried out by adopting a rotary kiln volatilization-dust collection-kiln slag water quenching process. The method mainly comprises the steps of heating goethite slag in a rotary kiln to 1250 ℃ for volatilization, volatilizing valuable metals such as zinc and indium in smoke, recovering zinc and indium in a dust mode, and finally carrying out water quenching treatment on roasting slag. The method mainly has the following problems: 1) the volatilization rate of zinc and indium is not high, and especially when the goethite slag contains more zinc ferrite, the zinc ferrite can not be effectively decomposed by high-temperature volatilization to volatilize the zinc, so that part of zinc and indium are lost in water-quenched slag, and the waste of resources is caused; 2) the rotary kiln has higher volatilization temperature, so that the energy consumption is higher, and the cost is brought to the operation of enterprises; 3) iron is not effectively utilized; roasted kiln slag is directly sold after water quenching, and iron resources cannot be effectively recycled.
Therefore, it is imperative to find a method for recovering valuable metals from goethite slag economically, reasonably and efficiently.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for comprehensively recovering valuable metals from goethite slag, which can efficiently recover zinc, indium and iron elements from goethite slag and lay the foundation for the resource utilization of valuable metals.
In order to achieve the above object, the present invention provides a method for comprehensively recovering valuable metals from goethite slag, comprising the steps of:
1) grinding goethite slag until the granularity is-200 meshes to-400 meshes, and mixing the fine powder according to the weight ratio of goethite slag: a chlorine-containing salt: carbon powder 1: 0.05-1: proportioning materials in a mass ratio of 0.05-1; uniformly mixing the ingredients, and pelletizing, wherein the diameter of the pellets is 10-20 mm;
2) roasting the pellets in the step 1) at 500-1100 ℃ for 1-6 h, collecting zinc-indium-containing dust generated in the volatilization process, and obtaining roasted sand;
in the roasting process of the goethite slag, metal zinc and indium, zinc chloride and indium chloride can be volatilized due to low boiling points of zinc, indium and compounds. The zinc and indium will react with oxygen to produce zinc oxide and indium oxide, the volatile material (containing zinc and indium dust) mainly contains zinc oxide, zinc chloride, zinc oxide, indium chloride, etc., and the indium and zinc in the volatile material are separated and purified by conventional method.
3) Cooling the roasted calcine obtained in the step 2) to room temperature, then grinding the calcine to a granularity of-200 meshes, and carrying out magnetic separation under the condition that the magnetic field intensity is 160-350 mT to obtain an iron ore concentrate product.
The residual magnetic separation tailings after the iron ore concentrate product is obtained through magnetic separation can be used as building materials, such as cement raw materials.
Further, the iron ore slag in the step 1): a chlorine-containing salt: the mass ratio of the carbon powder is 1: 0.05-0.4: 0.05 to 0.5.
Further, in the step 1), the chlorine-containing salt is one or more of sodium chloride, calcium chloride, potassium chloride, calcium chlorate, sodium chlorate, potassium chlorate, calcium hypochlorite, sodium perchlorate, potassium perchlorate and the like.
When a mixture of multiple chlorine-containing salts is used, any mass ratio between the chlorine-containing salts can be used.
Further, the roasting in the step 2) is carried out for 2-4 hours at 900-1100 ℃.
Furthermore, when the magnetic separation is carried out in the step 3), the magnetic field intensity is 200-300 mT.
Further, the goethite slag contains 20 to 60 wt% of iron, 6 to 15 wt% of zinc, and 0.01 to 0.5 wt% of indium.
The invention provides a method for comprehensively recovering valuable metals in goethite slag, which utilizes a roasting system containing chloride and carbon powder to reduce the problem of high roasting volatilization temperature of the prior art and realize high-efficiency volatilization of zinc and indium; realizing the high-efficiency recovery of iron.
Among the key parameters that affect zinc, indium and iron recovery rates are goethite slag: a chlorine-containing salt: carbon powder mass ratio, roasting temperature, roasting time, magnetic separation strength and the like.
The chlorine-containing salt is added to a reaction system, so that phases containing zinc and indium are intensively decomposed, the phases are easier to volatilize, and the reaction temperature (1200-1300 ℃) of the traditional magnetizing roasting is reduced, so that the volatilization rates of zinc and indium can be obviously improved.
The addition of the carbon powder can effectively promote the generation of a magnetic iron-containing phase within a parameter limit range, can promote the decomposition of zinc ferrite in the goethite slag by combining the roasting temperature and the roasting time, provides conditions for obtaining iron ore concentrate by subsequent magnetic separation, and can play a role in increasing the iron recovery rate by combining the change of the magnetic field strength within the parameter limit range.
In addition, goethite slag: when the mass ratio of the chlorine-containing salt, the roasting temperature and the roasting time are changed within the parameter limit range, the volatilization rates of zinc and indium are gradually influenced after being increased; the goethite slag, the carbon powder mass ratio, the roasting temperature, the roasting time and the magnetic field intensity play a role in increasing the iron recovery rate when changing within the parameter limit range.
The low-temperature thermal field means that the goethite slag can react when the roasting temperature is controlled to be 500-1100 ℃, so that the reaction temperature of roasting at 1200-1300 ℃ in the original production process is reduced, and the energy consumption and the production cost are effectively reduced.
The invention has the beneficial effects that:
the invention provides a method for comprehensively recovering valuable metals in goethite, which can realize the high-efficiency volatilization recovery of zinc and indium in the goethite under a low-temperature thermal field, solves the problems of overhigh volatilization temperature, low volatilization rate of zinc and indium, ineffective utilization of iron and the like of the goethite, realizes the comprehensive recovery of the zinc, indium and iron in the goethite, has the volatilization rate of zinc of more than 70 percent, the volatilization rate of indium of more than 75 percent and the iron grade of an iron ore concentrate product of more than 60 percent, greatly improves the resource utilization rate and realizes the resource utilization of solid wastes. The method provided by the invention has the advantages of simple process flow, simple and convenient operation, low raw material cost, no pollution to the environment, great environmental benefit and economic benefit, and capability of meeting the requirement of current green metallurgy on clean production.
Drawings
FIG. 1 is a process flow diagram for the comprehensive recovery of valuable metals from goethite slag according to the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments. The following examples are only illustrative of the present invention, and the scope of the present invention shall include the full contents of the claims, not limited to the examples.
Example 1
The contents of iron in the goethite slag in Guangdong province are 36.88% of iron, 12.08% of zinc and 0.02% of indium, and the main chemical detection results and the phase analysis results are shown in tables 1-3. Grinding 100g of goethite slag to the granularity of-200 meshes to-400 meshes according to the process flow shown in figure 1, mixing the ground goethite slag with 10g of calcium chloride and 45g of carbon powder, pelletizing, wherein the pellet granularity is 10-20mm, roasting in a tubular furnace, controlling the roasting temperature to be 900 ℃ and the roasting time to be 2 hours. Collecting the volatilized zinc-indium-containing dust in the roasting process. And grinding the obtained material to the granularity of-200 meshes after roasting, and carrying out magnetic separation under the condition that the magnetic field intensity is 200mT to obtain an iron ore concentrate product. In the experimental process, the content of zinc, indium and iron in the roasted material, the zinc-indium-containing dust, the iron concentrate and the magnetic separation tailings needs to be respectively detected and analyzed by chemical elements, and the recovery rate is calculated.
According to calculation, the recovery rate of zinc is 71.1%, the recovery rate of indium is 78.2%, and the grade of iron ore concentrate is 60.2%.
TABLE 1 analysis of chemical elements of certain goethite slag
TABLE 2 phase analysis results of some goethite slag iron
TABLE 3 phase analysis results of certain goethite slag Zinc
Example 2
The contents of iron in the goethite slag in Guangdong province are 36.88% of iron, 12.08% of zinc and 0.02% of indium, and the main chemical detection results and the phase analysis results are shown in tables 1-3. Grinding 100g of goethite slag to the granularity of-200 meshes to-400 meshes according to the process flow shown in figure 1, mixing with 5g of sodium chloride and 50g of carbon powder, pelletizing, wherein the pellet granularity is 10-20mm, roasting in a tubular furnace, controlling the roasting temperature at 900 ℃ and the roasting time at 2 h. Collecting the volatilized zinc-indium-containing dust in the roasting process. And grinding the obtained material to the granularity of-200 meshes after roasting, and carrying out magnetic separation under the condition that the magnetic field intensity is 160mT to obtain an iron ore concentrate product. In the experimental process, the content of zinc, indium and iron in the roasted material, the zinc-indium-containing dust, the iron concentrate and the magnetic separation tailings needs to be respectively detected and analyzed by chemical elements, and the recovery rate is calculated.
According to calculation, the recovery rate of zinc is 73.4%, the recovery rate of indium is 75.5%, and the grade of iron ore concentrate is 64.2%.
Example 3
The contents of iron in the goethite slag in Guangdong province are 36.88% of iron, 12.08% of zinc and 0.02% of indium, and the main chemical detection results and the phase analysis results are shown in tables 1-3. Grinding 100g of goethite slag to the granularity of-200 meshes to-400 meshes according to the process flow shown in figure 1, mixing with 15g of potassium chloride and 40g of carbon powder, pelletizing, wherein the pellet granularity is 10-20mm, roasting in a tubular furnace, controlling the roasting temperature at 900 ℃ and the roasting time at 2 h. Collecting the volatilized zinc-indium-containing dust in the roasting process. And grinding the obtained material to the granularity of-200 meshes after roasting, and carrying out magnetic separation under the condition that the magnetic field intensity is 240mT to obtain an iron ore concentrate product. In the experimental process, the content of zinc, indium and iron in the roasted material, the zinc-indium-containing dust, the iron concentrate and the magnetic separation tailings needs to be respectively detected and analyzed by chemical elements, and the recovery rate is calculated.
According to calculation, the recovery rate of zinc is 81.2%, the recovery rate of indium is 76.1%, and the grade of iron ore concentrate is 63.1%.
Example 4
The contents of iron in the goethite slag in Guangdong province are 36.88% of iron, 12.08% of zinc and 0.02% of indium, and the main chemical detection results and the phase analysis results are shown in tables 1-3. Grinding 100g of the goethite slag to the granularity of-200 meshes to-400 meshes according to the process flow shown in figure 1, mixing with 20g of calcium chlorate and 35g of carbon powder, pelletizing, wherein the pellet granularity is 10-20mm, roasting in a tubular furnace, controlling the roasting temperature to be 900 ℃, and the roasting time to be 3 hours. Collecting the volatilized zinc-indium-containing dust in the roasting process. And grinding the obtained material to the granularity of-200 meshes after roasting, and carrying out magnetic separation under the condition that the magnetic field intensity is 270mT to obtain an iron ore concentrate product. In the experimental process, the content of zinc, indium and iron in the roasted material, the zinc-indium-containing dust, the iron concentrate and the magnetic separation tailings needs to be respectively detected and analyzed by chemical elements, and the recovery rate is calculated.
According to calculation, the recovery rate of zinc is 82.8%, the recovery rate of indium is 75.8%, and the grade of iron ore concentrate is 61.2%.
Example 5
The contents of iron in the goethite slag in Guangdong province are 36.88% of iron, 12.08% of zinc and 0.02% of indium, and the main chemical detection results and the phase analysis results are shown in tables 1-3. Grinding 100g of the goethite slag to the granularity of-200 meshes to-400 meshes according to the process flow shown in figure 1, mixing with 25g of sodium chlorate and 30g of carbon powder, pelletizing, wherein the pellet granularity is 10-20mm, roasting in a tubular furnace, controlling the roasting temperature to be 1000 ℃, and the roasting time to be 3 hours. Collecting the volatilized zinc-indium-containing dust in the roasting process. And grinding the obtained material to the granularity of-200 meshes after roasting, and carrying out magnetic separation under the magnetic field intensity of 300mT to obtain an iron ore concentrate product. In the experimental process, the content of zinc, indium and iron in the roasted material, the zinc-indium-containing dust, the iron concentrate and the magnetic separation tailings needs to be respectively detected and analyzed by chemical elements, and the recovery rate is calculated.
The recovery rate of zinc is 83.2%, the recovery rate of indium is 77.3%, and the grade of iron ore concentrate is 62.8%.
Example 6
The contents of iron in the goethite slag in Guangdong province are 36.88% of iron, 12.08% of zinc and 0.02% of indium, and the main chemical detection results and the phase analysis results are shown in tables 1-3. Grinding 100g of the goethite slag to the granularity of-200 meshes to-400 meshes according to the process flow shown in figure 1, mixing the ground goethite slag with 30g of potassium chlorate and 25g of carbon powder, pelletizing, wherein the pellet granularity is 10-20mm, roasting in a tubular furnace, controlling the roasting temperature to be 1000 ℃ and the roasting time to be 3 hours. Collecting the volatilized zinc-indium-containing dust in the roasting process. And grinding the obtained material to the granularity of-200 meshes after roasting, and carrying out magnetic separation under the magnetic field intensity of 320mT to obtain an iron ore concentrate product. In the experimental process, the content of zinc, indium and iron in the roasted material, the zinc-indium-containing dust, the iron concentrate and the magnetic separation tailings needs to be respectively detected and analyzed by chemical elements, and the recovery rate is calculated.
The recovery rate of zinc is 83.9%, the recovery rate of indium is 78.4%, and the grade of iron ore concentrate is 60.9%.
Example 7
The contents of iron in the goethite slag in Guangdong province are 36.88% of iron, 12.08% of zinc and 0.02% of indium, and the main chemical detection results and the phase analysis results are shown in tables 1-3. Grinding 100g of goethite slag to the granularity of-200 meshes to-400 meshes according to the process flow shown in figure 1, mixing with 35g of calcium hypochlorite and 20g of carbon powder, pelletizing, wherein the pellet granularity is 10-20mm, roasting in a tubular furnace, controlling the roasting temperature to be 1000 ℃, and roasting for 4 hours. Collecting the volatilized zinc-indium-containing dust in the roasting process. And grinding the obtained material to the granularity of-200 meshes after roasting, and carrying out magnetic separation under the magnetic field intensity of 340mT to obtain an iron ore concentrate product. In the experimental process, the content of zinc, indium and iron in the roasted material, the zinc-indium-containing dust, the iron concentrate and the magnetic separation tailings needs to be respectively detected and analyzed by chemical elements, and the recovery rate is calculated.
According to calculation, the recovery rate of zinc is 84.9%, the recovery rate of indium is 76.8%, and the grade of iron ore concentrate is 61.8%.
Example 8
The contents of iron in the goethite slag in Guangdong province are 36.88% of iron, 12.08% of zinc and 0.02% of indium, and the main chemical detection results and the phase analysis results are shown in tables 1-3. Grinding 100g of goethite slag to the granularity of-200 meshes to-400 meshes according to the process flow shown in figure 1, mixing with 40g of sodium perchlorate and 15g of carbon powder, pelletizing, wherein the pellet granularity is 10-20mm, roasting in a tubular furnace, controlling the roasting temperature to be 1000 ℃, and roasting for 4 hours. Collecting the volatilized zinc-indium-containing dust in the roasting process. And grinding the obtained material to the granularity of-200 meshes after roasting, and carrying out magnetic separation under the condition that the magnetic field intensity is 350mT to obtain an iron ore concentrate product. In the experimental process, the content of zinc, indium and iron in the roasted material, the zinc-indium-containing dust, the iron concentrate and the magnetic separation tailings needs to be respectively detected and analyzed by chemical elements, and the recovery rate is calculated.
The recovery rate of zinc is 84.3%, the recovery rate of indium is 75.5%, and the grade of iron ore concentrate is 64.7%.
Example 9
The contents of iron in the goethite slag in Guangdong province are 36.88% of iron, 12.08% of zinc and 0.02% of indium, and the main chemical detection results and the phase analysis results are shown in tables 1-3. Grinding 100g of goethite slag to the granularity of-200 meshes to-400 meshes according to the process flow shown in figure 1, mixing with 30g of potassium perchlorate and 10g of carbon powder, pelletizing, wherein the pellet granularity is 10-20mm, roasting in a tubular furnace, controlling the roasting temperature at 1100 ℃ and the roasting time at 4 h. Collecting the volatilized zinc-indium-containing dust in the roasting process. And grinding the obtained material to the granularity of-200 meshes after roasting, and carrying out magnetic separation under the condition that the magnetic field intensity is 200mT to obtain an iron ore concentrate product. In the experimental process, the content of zinc, indium and iron in the roasted material, the zinc-indium-containing dust, the iron concentrate and the magnetic separation tailings needs to be respectively detected and analyzed by chemical elements, and the recovery rate is calculated.
According to calculation, the recovery rate of zinc is 87.1%, the recovery rate of indium is 78.2%, and the grade of iron ore concentrate is 65.2%.
Comparative example 1:
the contents of iron in the goethite slag in Guangdong province are 36.88% of iron, 12.08% of zinc and 0.02% of indium, and the main chemical detection results and the phase analysis results are shown in tables 1-3. 100g of goethite slag is not mixed with chlorine-containing salt and carbon powder, the rest is ground to the granularity of-200 meshes to-400 meshes according to the process flow shown in figure 1, pellets are formed, the pellet granularity is 10-20mm, the pellets are placed into a tubular furnace to be roasted, the roasting temperature is controlled to be 1000 ℃, and the roasting time is 4 hours. Collecting the volatilized zinc-indium-containing dust in the roasting process. And grinding the obtained roasted product to the granularity of-200 meshes after roasting is finished, and carrying out magnetic separation under the condition that the magnetic field intensity is 200mT to obtain an iron ore concentrate product. In the experimental process, the content of zinc, indium and iron in the roasted material, the zinc-indium-containing dust, the iron concentrate and the magnetic separation tailings needs to be respectively detected and analyzed by chemical elements, and the recovery rate is calculated.
The recovery rate of zinc is 20.88%, the recovery rate of indium is 21.2%, and the grade of iron ore concentrate is 45.3%.
In conclusion, the method for comprehensively recovering valuable metals from the goethite slag can efficiently recover zinc, indium and iron elements in the goethite slag, the recovery rate of zinc is more than 70%, the recovery rate of indium is more than 75%, the grade of iron ore concentrate is more than 60%, the utilization rate of resources is greatly improved, and a foundation is laid for solid waste resource utilization of the goethite slag. The method has the advantages of simple operation of the technological process, wide source of the required raw materials, low cost, easy operation of the experiment, low requirement on equipment, low energy consumption, environmental friendliness, great environmental benefit and economic benefit, and capability of meeting the requirement of the current green metallurgy on clean production.
The invention has not been described in detail and is part of the common general knowledge of a person skilled in the art.
Claims (6)
1. A method for comprehensively recovering valuable metals in goethite slag is characterized by comprising the following steps:
1) grinding goethite slag until the granularity is-200 meshes to-400 meshes, and mixing the fine powder according to the weight ratio of goethite slag: a chlorine-containing salt: carbon powder 1: 0.05-1: proportioning materials according to the mass ratio of 0.05-1; uniformly mixing the ingredients, and pelletizing, wherein the diameter of the pellets is 10-20 mm;
2) roasting the pellets in the step 1) at 500-1100 ℃ for 1-6 h, collecting zinc-indium-containing dust generated in the volatilization process, and obtaining roasted sand;
3) cooling the roasted calcine obtained in the step 2) to room temperature, then grinding the calcine to a granularity of-200 meshes, and carrying out magnetic separation under the condition that the magnetic field intensity is 160-350 mT to obtain an iron ore concentrate product.
2. The method for comprehensively recovering valuable metals from goethite slag according to claim 1, wherein the mass ratio of the goethite slag, the chlorine-containing salt and the carbon powder in step 1) is 1: 0.05-0.4: 0.1 to 0.5.
3. The method for integrated recovery of valuable metals from needle-iron slag according to claim 1, wherein the chlorine-containing salt in step 1) is one or more of sodium chloride, calcium chloride, potassium chloride, calcium chlorate, sodium chlorate, potassium chlorate, calcium hypochlorite, sodium perchlorate, and potassium perchlorate.
4. The method for comprehensively recovering valuable metals from goethite slag according to claim 1, wherein the roasting in the step 2) is carried out at 900 to 1100 ℃ for 2 to 4 hours.
5. The method for comprehensively recovering valuable metals from needle slag according to claim 1, wherein the magnetic separation in step 3) is performed at a magnetic field strength of 200 to 300 mT.
6. The method for comprehensively recycling valuable metals from goethite slag according to any one of claims 1 to 5, wherein the goethite slag contains 20 to 60 wt% of iron, 6 to 15 wt% of zinc, and 0.01 to 0.5 wt% of indium.
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