CN111057858A - Comprehensive recovery method for extracting copper, iron, zinc and lead from copper slag - Google Patents
Comprehensive recovery method for extracting copper, iron, zinc and lead from copper slag Download PDFInfo
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- 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
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- C22B13/00—Obtaining lead
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- C22B13/045—Recovery from waste materials
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- C22B15/00—Obtaining copper
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- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
- C22B19/24—Obtaining zinc otherwise than by distilling with leaching with alkaline solutions, e.g. ammonia
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- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
- C22B19/26—Refining solutions containing zinc values, e.g. obtained by leaching zinc ores
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Abstract
The invention discloses a comprehensive recovery method for extracting copper, iron, zinc and lead from copper slag. The method comprises the following steps: grinding and grading, namely crushing, grinding and screening the copper slag to separate difficult-to-grind materials to obtain primary materials; a step of fused alkali leaching, which is to perform fused alkali leaching on the primary material, and simultaneously enhance the fused alkali leaching by utilizing microwave irradiation to obtain fused alkali slurry; a secondary alkaline leaching step, namely adding water to the molten alkaline slurry for dilution, then performing secondary alkaline leaching, and filtering to obtain secondary alkaline leaching residues and secondary alkaline leaching solution; and a valuable metal recovery step of recovering the valuable metals in the secondary alkali leaching solution and the secondary alkali leaching residue respectively. The method has the advantages of environmental protection, short process flow, stable performance and strong adaptability of smelting slag.
Description
Technical Field
The invention relates to the field of non-ferrous metallurgy and secondary resource recycling, in particular to a comprehensive recovery method for extracting copper, iron, zinc and lead from copper slag.
Background
The copper slag is slag generated in copper smelting process, zinc smelting process, cadmium smelting process and other processes, and belongs to one of non-ferrous metal slag. In the copper production mainly based on pyrometallurgical copper smelting in China, 2-3 t of slag is produced every 1t of copper produced. Modern copper smelting process focuses on improving production efficiency, and residual copper and other valuable metals in copper slag are increased in content, and the copper slag often contains various valuable metals such as iron, copper, zinc, lead, cobalt, nickel and the like and a small amount of precious metals. The main minerals in the copper slag are iron-containing minerals, which are mainly iron-containing olivine and magnetic iron oxide minerals. In the copper smelting process, Pb, Zn and Ni are easy to react with Fe and SiO2Reaction enriched in fayalite mineral (Me (Pb, Zn, Ni) FeSiO4) In (1). If the converting slag return flow is adopted in the smelting-converting copper smelting process, lead and zinc are obviously enriched in the fayalite mineral and are easily accumulated into the fayalite mineral phase with high lead and zinc content along with the increase of the cycle times. The key problem of the separation and recovery of the valuable metals in the valuable metal-containing fayalite is to destroy the wrapping structure of the fayalite.
The research on the treatment method of the copper slag at home and abroad is very much, and the method mainly focuses on three aspects, namely extraction of valuable metals, use as building materials and use as catalysts or modifiers. For the copper slag containing valuable metals such as lead, zinc, nickel, cobalt and the like, the extraction of the valuable metals is mainly used, but the recovery is difficult because the occurrence state of the valuable metal elements in the copper slag is complex and the valuable metal elements are closely symbiotic with each other, and particularly the valuable metals and the iron-containing silicate minerals are closely related, so that the effective recovery is difficult to realize by a conventional method.
At present, the research on extracting valuable metals from copper slag mainly comprises two methods, namely a beneficiation method to obtain concentrate, and a reduction method to obtain metals and alloys. The beneficiation method mainly utilizes the difference of physical properties of various oxides in the copper slag, the beneficiation effect is greatly related to the cooling mode of the copper slag, and the beneficiation method has poor adaptability to unmagnetic fayalite. The patent 'magnetic suspension combined beneficiation method for recovering copper from copper smelting converter slag (CN 102294297A)' adopts a magnetic separation-flotation combined process to treat copper slag, although the copper recovery rate can reach 96.69%, the separation and recovery of valuable metal elements in fayalite are not realized. The reducing agent is used for reducing the copper slag at high temperature to obtain metallic iron or ferroalloy rich in other metal elements, but the energy consumption is high, harmful gas is easy to generate, lead, zinc and the like in the copper slag can enter flue gas in the form of simple substance steam, and the problem of secondary recovery of the metal elements is prominent. In the patent "system and method for treating copper slag (CN 106756066 a)", metallized pellets are obtained by reduction roasting of copper slag, and after the roasted soot is collected, the escaped lead-zinc vapor is recovered by a wet method, but the lead and zinc of the metallized pellets are not effectively separated from copper in the process.
In conclusion, the method for saving energy, achieving high efficiency, reducing environmental pollution and improving the utilization rate of resources is significant for solving the problem that valuable metal elements wrapped by iron silicate minerals in copper slag are difficult to separate and recycle.
Disclosure of Invention
The invention aims to provide a comprehensive recovery method for extracting copper, iron, zinc and lead from copper slag so as to realize comprehensive recovery and utilization of valuable metals of copper, iron, lead and zinc in the copper slag.
In order to achieve the above objects, according to one aspect of the present invention, there is provided an integrated recovery method for extracting copper, iron, zinc and lead from copper slag. The comprehensive recovery method comprises the following steps: s1, carrying out ore grinding and grading, namely crushing, grinding and screening copper slag, and separating difficult-to-grind materials to obtain primary materials; s2, a pre-alkaline leaching step, namely, pre-leaching the primary material by using an alkaline solution, and filtering to obtain pre-leaching slag and a pre-leaching solution; s3, primary alkali fusion, namely performing alkali fusion leaching on the pre-leached residues, and simultaneously performing microwave irradiation to enhance alkali fusion leaching to obtain alkali fusion slurry; s4, a secondary alkaline leaching step, namely adding water to the molten alkaline slurry for dilution, then performing secondary alkaline leaching, and filtering to obtain secondary alkaline leaching residue and secondary alkaline leaching solution; s5, recovering valuable metals; s51, extracting copper and iron, namely, performing reduction roasting-magnetic separation on the secondary alkaline leaching residue to obtain a copper product and an iron product; s52, extracting lead and zinc, namely combining the pre-leaching solution and the secondary alkaline leaching solution, adding a lead precipitator for separation to obtain a lead product and a solution after lead precipitation, and electrolyzing the solution after lead precipitation to obtain a zinc product and an electrolyzed solution; s6, desiliconizing the electrolyzed solution by adsorption or precipitation, evaporating and crystallizing the desiliconized solution, wherein crystal particles are caustic soda; and returning the caustic soda obtained by crystallization to the pre-alkaline leaching step for recycling.
Further, the method for enhancing the alkali fusion leaching by utilizing the microwave irradiation comprises the following steps: uniformly mixing the pre-leached residues and caustic soda, placing the pre-leached residues and the caustic soda in a microwave field for roasting, controlling the roasting temperature rise rate, melting the caustic soda after the pre-leached residues reach a preset temperature, corroding and destroying an iron silicate structure in the pre-leached residues by the molten alkali, and reacting alkali-soluble substances in the pre-leached residues with the alkali to expose non-alkali-soluble components.
Further, the step of primary alkali melting specifically comprises the following steps: uniformly mixing the pre-leached slag and caustic soda in a mass ratio of 1: 0.5-3, roasting under the microwave condition that the output power is 1-75 KW and the microwave frequency is 2450MHz, controlling the temperature rise rate at 5-50 ℃/min and the temperature to reach 320-400 ℃, and preserving heat for 1-4 hours to obtain the molten alkali slurry.
Further, the copper slag comprises the following components in percentage by mass: 0.1-30% of Cu, 0-20% of Pb, 0-20% of Zn, 15-50% of Fe and SiO210~40%。
Furthermore, the classification in the step of grinding and classifying is 0.2mm screening and classifying, and the difficult-to-grind materials are materials with the grain size of more than 0.2mm after grinding for 5 min.
Further, in the secondary alkaline leaching step, water is added to the molten alkaline slurry to dilute the slurry, the concentration of caustic soda is 10-20%, and the time of secondary alkaline leaching is 1-3 hours.
Further, the leaching temperature in the pre-alkaline leaching step and the secondary alkaline leaching step is room temperature-90 ℃ by using an alkaline solution.
Compared with the prior art, the method disclosed by the invention fully utilizes the alkali dissolution characteristic difference of each component in the copper slag, and utilizes the microwave strengthening and alkali melting strengthening alkali dissolution reaction to greatly destroy the iron silicate mineral wrapping structure in the copper slag, so that the alkali soluble material and the alkali insoluble material are fully separated, wherein the lead and zinc elements are dissolved and leached by alkali and enter an alkali leaching solution, and the copper and iron are fully exposed and remained in the slag phase, thereby realizing the step-by-step recovery of valuable metal elements in the copper slag. The method has the advantages of environmental protection, short process flow, stable performance and strong adaptability of smelting slag.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic process flow diagram for comprehensively recovering valuable metals from copper slag according to an embodiment of the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The method for comprehensively recovering the valuable metals in the copper slag has wide adaptability to the pyrometallurgical copper smelting slag, and can realize comprehensive recovery and utilization of the valuable metals of copper, iron, lead and zinc in the copper slag.
According to an exemplary embodiment of the present invention, a method for comprehensively recovering valuable metals from copper slag is provided. The method comprises the following steps: grinding and grading, namely crushing, grinding and screening the copper slag to separate difficult-to-grind materials to obtain primary materials; a primary alkali fusion step, in which the primary material is subjected to alkali fusion leaching, and simultaneously microwave irradiation is utilized to enhance alkali fusion leaching, so that alkali fusion slurry is obtained; a secondary alkaline leaching step, namely adding water to the molten alkaline slurry for dilution, then performing secondary alkaline leaching, and filtering to obtain secondary alkaline leaching residues and secondary alkaline leaching solution; and a valuable metal recovery step of recovering the valuable metals in the secondary alkali leaching solution and the secondary alkali leaching residue respectively.
Compared with the prior art, the method disclosed by the invention fully utilizes the alkali dissolution characteristic difference of each component in the copper slag, and utilizes the microwave strengthening and alkali melting strengthening alkali dissolution reaction to greatly destroy the iron silicate mineral wrapping structure in the copper slag, so that the alkali soluble material and the alkali insoluble material are fully separated, wherein the lead and zinc elements are dissolved and leached by alkali and enter an alkali leaching solution, and the copper and iron are fully exposed and remained in the slag phase, thereby realizing the step-by-step recovery of valuable metal elements in the copper slag. The method has the advantages of environmental protection, short process flow, stable performance and strong adaptability of smelting slag.
In a preferred embodiment of the present invention, the microwave irradiation-enhanced alkali fusion leaching comprises: uniformly mixing the primary material and caustic soda, placing the mixture in a microwave field for roasting, controlling the roasting temperature rise rate, melting the caustic soda after the preset temperature is reached, corroding and damaging an iron silicate structure in the primary material by the molten alkali, and reacting an alkali-soluble substance in the primary material with the alkali to expose a non-alkali-soluble component.
Preferably, the primary material further comprises a pre-alkaline leaching step with an alkaline solution before the primary alkali-fusing step, and pre-leaching residue and pre-leaching solution are obtained by filtering, wherein the pre-leaching residue is used as the material for alkali-fusing leaching. The granularity of the copper slag (pre-leaching slag) of the undersize material in the pre-alkaline leaching process is less than 0.2 mm. The caustic soda solution used in the step of pre-alkaline leaching by using an alkaline solution has the caustic soda concentration of 10-20%, the alkali soluble materials are lead and zinc with bare surfaces, the alkaline leaching slurry is filtered and separated, the filtrate is pre-leaching solution containing lead and zinc, and the iron silicate wrapping materials difficult to dissolve in the alkaline are concentrated in the pre-leaching residue.
In a preferred embodiment of the present invention, the valuable metal recovery step specifically includes: carrying out reduction roasting-magnetic separation on the secondary alkaline leaching residue to obtain a copper product and an iron product; and combining the pre-leaching solution and the secondary alkaline leaching solution, adding a lead precipitator for separation to obtain a lead product and a solution after lead precipitation, and electrolyzing the solution after lead precipitation to obtain a zinc product and an electrolyzed solution.
According to a typical embodiment of the invention, the solution after electrolysis is desilicated by adsorption or precipitation, the desilicated solution is evaporated for crystallization, and the crystallized particles are caustic soda; preferably, the caustic soda obtained by crystallization is returned to the pre-alkaline leaching step for recycling.
Preferably, the alkali-fusion leaching step specifically comprises: uniformly mixing copper slag and caustic soda in a mass ratio of 1: 0.5-3, roasting under the microwave condition that the output power is 1-75 KW and the microwave frequency is 2450MHz, controlling the heating rate at 5-50 ℃/min, keeping the temperature at 320-400 ℃, and then preserving the heat for 1-4 hours to obtain molten alkali slurry, wherein the molten alkali slurry comprises alkali liquid which is good in alkali solubility and mainly contains lead and zinc and alkali slag which is not alkali solubility and mainly contains copper and iron. The microwave roasting power is greatly related to the amount of the processed materials, and a plurality of materials use high power and can be basically linearly related; the microwave roasting temperature rise rate has great correlation with the microwave power and the material wave-absorbing performance, and the skilled person can select the microwave roasting temperature rise rate within the preferable range according to the actual situation.
According to a typical embodiment of the invention, the copper slag comprises the following components in percentage by mass: 0.1-30% of Cu, 0-20% of Pb, 0-20% of Zn, 15-50% of Fe and SiO210~40%。
According to a typical embodiment of the present invention, the classification in the grinding classification step is 0.2mm screening classification, the difficult-to-grind material is a material with a grain size of more than 0.2mm after grinding for 5min, and the difficult-to-grind material is a material with good ductility, such as copper simple substance.
Preferably, in the secondary alkaline leaching step, the concentration of caustic soda after the alkali melt slurry is diluted by adding water is 10-20%, and the time of the secondary alkaline leaching is 1-3 hours. The secondary alkali leaching slag is non-alkali-soluble copper iron oxide or hydroxide, and the secondary alkali leaching solution is lead-zinc leaching solution.
Preferably, the leaching temperature in the pre-alkaline leaching step and the secondary alkaline leaching step is room temperature to 90 ℃ by using an alkaline solution.
In a preferred embodiment of the invention, the method for microwave roasting-alkali fusion leaching of copper slag sequentially comprises the following steps:
(1) crushing and grinding the copper slag, then screening and grading, screening and separating difficult-to-grind materials and primary materials, wherein valuable metal parts difficult to separate in the copper slag are concentrated in the primary materials;
(2) performing a pre-alkaline leaching step on the primary material, pre-leaching the easy-alkaline leaching component with an alkaline solution, and filtering and separating the pre-leached slurry with the alkaline solution to obtain pre-leached slag and a pre-leached liquid which are difficult to be leached with the alkaline;
(3) uniformly mixing the pre-leaching residue and caustic soda, performing microwave roasting-caustic fusion leaching on the mixed material, and corroding and dissolving the material difficult to be caustic-leached in a caustic fusion environment under the microwave irradiation roasting condition to obtain caustic fusion slurry;
(4) after cooling the molten alkali slurry, diluting the molten alkali slurry with water to obtain an alkali solution with a certain concentration, dissolving an alkali-soluble material with a secondary alkali solution, and filtering to obtain secondary alkali leaching residue and a secondary alkali leaching solution;
(5) the secondary alkaline leaching residue is an alkali-insoluble copper-and-iron-containing material, and is washed and filtered by dilute alkaline solution, and then copper and iron are separated to obtain a copper product and an iron product;
(6) combining the pre-leaching solution obtained in the step (2) and the secondary alkaline leaching solution obtained in the step (4) into an alkaline leaching solution containing lead and zinc, and carrying out lead-zinc separation on the alkaline leaching solution to obtain a lead product and a zinc product;
(7) and (3) desiliconizing the alkaline solution after extracting lead and zinc in advance in an adsorption or precipitation mode, recovering desiliconized solids to prepare a silicon product, evaporating and crystallizing the solution after desiliconization, returning the crystallized particles to the step (4) as caustic soda, and returning the alkali solution after crystallization to the pre-alkaline leaching step (2).
The following examples are provided to further illustrate the advantageous effects of the present invention.
Example 1
Copper content 3%, lead content 6%, zinc content 3%, iron content 20%, SiO content2Crushing 20% of certain copper smelting slag to 2mm, grinding the slag for 5min by a ball mill, wherein the grinding fineness of 0.074 mm accounts for 90%, stirring and pre-alkaline leaching the ground ore product by 15% of NaOH solution at a liquid-solid ratio of 5:1 at 90 ℃ for 3h, and filtering to obtain the copper-containing product of 3.6%, lead-containing product of 6.2%, zinc-containing product of 3.1%, iron-containing product of 24% and SiO-containing product of 3.6%, lead-containing product of 3.2%, SiO-containing product of 24%223.6% and a yield of 83.3%. Heating and roasting the pre-leached slag and the caustic soda particles according to the mass ratio of 1:1.5 under the condition that the microwave power is 5kW, heating to 350 ℃ at the speed of 6 ℃/min, preserving heat, stirring, melting and melting under the condition of microwave irradiationAnd (3) alkaline leaching for 3h, cooling the molten alkaline slurry, adding water to dilute the slurry until the alkaline mass concentration is 10%, stirring and washing the slurry at room temperature for leaching for 2h, and filtering the slurry after leaching to obtain secondary alkaline leaching residue and secondary alkaline leaching solution. Wherein, the secondary alkaline leaching residue contains 12 percent of copper, 52 percent of iron, 0.02 percent of lead and 0.01 percent of zinc, and the recovery rates of the copper and the iron respectively reach 98.6 percent and 94.2 percent. The pre-leaching solution and the secondary alkaline leaching solution are combined into alkaline leaching solution, and the comprehensive leaching rate of lead and zinc reaches more than 99 percent.
Example 2
As shown in fig. 1, phase analysis of copper slag containing 20.3%, 12.5%, 2.8%, and 22.6% of copper, lead, zinc, and iron, respectively, revealed that lead and zinc were present in iron silicate minerals and 15% of copper was present in silicate minerals. Crushing and grinding the copper converting slag, sieving and grading the crushed and ground copper converting slag by a 0.2mm sieve to separate 35 percent of copper materials difficult to grind, stirring and pre-alkaline leaching the materials of 0.2mm by a 12 percent NaOH solution at a liquid-solid ratio of 3:1 at 90 ℃ for 4 hours, and filtering the materials to obtain the copper-containing material 15.6 percent, the lead-containing material 16 percent, the zinc-containing material 3.6 percent, the iron-containing material 24 percent and the SiO-containing material223.6 percent of pre-alkaline leaching slag with the yield of 86 percent. Heating and roasting the pre-leaching residue and caustic soda particles according to the mass ratio of 1:2.5 under the condition that the microwave power is 6kW, heating to 400 ℃ at the speed of 8 ℃/min, carrying out heat preservation and stirring for leaching with molten alkali for 4h under the condition of microwave irradiation, adding water for diluting until the alkali mass concentration is 15% solution after cooling the molten alkali slurry, then carrying out stirring washing leaching for 2h at the temperature of 60 ℃, and filtering the leaching pulp to obtain secondary alkali leaching residue and secondary alkali leaching solution. The lead content in the secondary alkaline leaching residue is 0.4%, the zinc content is 0.5%, the residual lead and zinc content is less than 1%, and the recovery rates of copper and iron in the residue respectively reach 99.2% and 87.2%. Carrying out reduction roasting and magnetic separation on the secondary leaching residue to obtain a copper product with a copper grade of 95% and a copper recovery rate of 99%, and an iron product with an iron grade of 64% and an iron recovery rate of 85%; and mixing the alkali leaching solution to precipitate lead to obtain a lead sulfate product, and electrolyzing the lead-precipitated alkaline zinc-containing solution to obtain a zinc product.
Example 3
Copper content 0.3%, lead content 0.6%, zinc content 0.6%, iron content 40%, SiO content2Crushing 30% of certain copper smelting slag, grinding, and performing magnetic separation, wherein the contents of copper, lead, zinc, iron and silicon dioxide in magnetic separation tailings are respectively 0.8%, 1.2%, 11.3% and 35.6%, and the liquid-solid ratio of 10% NaOH solution in the magnetic separation tailings is 4:1Stirring at 90 ℃, pre-alkaline leaching for 2h, and filtering to obtain SiO2The content of the alkali pre-leaching residue is 11.3 percent. Heating and roasting the pre-leached slag and caustic soda particles according to the mass ratio of 1:0.8 under the condition that the microwave power is 6kW, heating to 320 ℃ at the speed of 3 ℃/min, preserving heat, stirring, melting and leaching for 2h, cooling the molten alkali slurry, adding water to dilute the slurry until the alkali mass concentration is 10%, stirring, washing and leaching for 2h at room temperature, enriching 98% of copper and 95% of iron in secondary alkali leaching slag, and introducing 99% of lead and zinc into an alkali leaching solution.
According to another microwave treatment mode of the copper-smelting slag with high iron content, pre-leaching slag and caustic soda particles are heated and roasted at the microwave power of 60kW according to the mass ratio of 1:0.8, the temperature is quickly raised to 350 ℃ at 40 ℃/min, then the low microwave power of 6kW is kept at the temperature, stirring is carried out, alkali-melting leaching is carried out for 3 hours, 99% of copper and 99% of iron are enriched in secondary alkali-leaching slag after alkali-melting slurry is cooled, and more than 99% of lead and zinc enter an alkali-leaching solution.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A comprehensive recovery method for extracting copper, iron, zinc and lead from copper slag is characterized by comprising the following steps:
s1, carrying out ore grinding and grading, namely crushing, grinding and screening copper slag, and separating difficult-to-grind materials to obtain primary materials;
s2, a pre-alkaline leaching step, namely, pre-leaching the primary material by using an alkaline solution, and filtering to obtain pre-leaching slag and a pre-leaching solution;
s3, primary alkali fusion, namely performing alkali fusion on the pre-leached residues, and meanwhile, strengthening the alkali fusion by using microwave irradiation to obtain alkali fusion slurry;
s4, a secondary alkaline leaching step, namely adding water to dilute the molten alkaline slurry, then performing secondary alkaline leaching, and filtering to obtain secondary alkaline leaching residue and secondary alkaline leaching solution;
s5, recovering valuable metals;
s51, extracting copper and iron, namely, performing reduction roasting-magnetic separation on the secondary alkaline leaching residue to obtain a copper product and an iron product;
s52, extracting lead and zinc, namely combining the pre-leaching solution and the secondary alkaline leaching solution, adding a lead precipitator for separation to obtain a lead product and a solution after lead precipitation, and electrolyzing the solution after lead precipitation to obtain a zinc product and an electrolyzed solution;
s6, desiliconizing the electrolyzed solution by adsorption or precipitation, evaporating and crystallizing the desiliconized solution, wherein crystal particles are caustic soda; and returning the caustic soda obtained by crystallization to the pre-alkaline leaching step for recycling.
2. The integrated recovery method of claim 1, wherein the enhancing the caustic leach with microwave irradiation comprises: uniformly mixing the pre-leached residues and caustic soda, placing the pre-leached residues and the caustic soda in a microwave field for roasting, controlling the roasting temperature rise rate, melting the caustic soda after the pre-leached residues reach a preset temperature, corroding and damaging iron silicate structures in the pre-leached residues by the molten alkali, and reacting alkali-soluble substances in the pre-leached residues with the alkali to expose non-alkali-soluble components.
3. The integrated recovery method according to any one of claims 1 to 2, wherein the primary alkali-melting step specifically comprises: uniformly mixing the pre-leached residues and caustic soda in a mass ratio of 1: 0.5-3, roasting under the microwave condition that the output power is 1-75 KW and the microwave frequency is 2450MHz, controlling the heating rate at 5-50 ℃/min and the temperature to reach 320-400 ℃, and preserving heat for 1-4 hours to obtain the alkali-fused slurry.
4. The comprehensive recovery method according to claim 1, wherein the copper slag comprises the following components in percentage by mass: 0.1-30% of Cu, 0-20% of Pb, 0-20% of Zn, 15-50% of Fe and SiO210~40%。
5. The integrated recovery method according to claim 1, wherein the classification in the grinding classification step is 0.2mm screening classification, and the difficult-to-grind material is a material with a grain size of more than 0.2mm after grinding for 5 min.
6. The integrated recovery method according to claim 1, wherein the caustic soda concentration of the diluted caustic soda slurry in the secondary alkaline leaching step is 10-20%, and the time of the secondary alkaline leaching is 1-3 hours.
7. The integrated recycling method according to claim 1, wherein the leaching temperature in the pre-alkaline leaching step and the secondary alkaline leaching step using the alkaline solution is room temperature to 90 ℃.
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