A method for comprehensive resource utilization of organic and inorganic solid waste synergistically

Abstract

The present invention discloses a method for comprehensive resource utilization of organic-inorganic solid waste synergistically, comprising the following steps: mixing ground tungsten slag, leather sludge and a chlorinating agent, then ball-milling the mixture to produce pellets; preheating the pellets, then heating to a roasting temperature at a set heating rate, performing chlorination roasting, and collecting volatilized smoke. The present invention uses two solid wastes, tungsten slag and leather sludge, and organic-inorganic synergistically cooperates to provide a stable process, simple operation, low cost, and can fully utilize the organic matter contained in the leather sludge, effectively improve the pyrometallurgical enrichment efficiency of valuable elements in the tungsten slag, and improve the comprehensive utilization efficiency of resources such as tungsten slag, while also reducing the leaching toxicity of chromium in the leather sludge.

Description

Technical Field

[0001] The present invention belongs to the technical field of comprehensive treatment of solid wastes, and in particular relates to a method for comprehensive resource utilization of organic and inorganic solid wastes in coordination. Background Art

[0002] Tungsten slag is the leaching slag produced during the smelting process of tungsten. It contains a large amount of valuable metals, including W, Sn, Fe, Mn, Zn, Pb, Nb, Ta, Bi, etc. At the same time, the elements Sn, Sb, and Bi are much higher than the grade of the original ore, and the content of Fe, Mn, Zn, etc. is rich, which has high recovery value and economic value. So far, most of the tungsten slag in my country is mainly stored. The large amount of tungsten slag accumulation will not only cause serious waste of resources, but also bring serious water pollution and soil pollution problems. Therefore, it is very important to strengthen the comprehensive utilization of tungsten slag.

[0003] At present, the comprehensive recycling of tungsten slag is mainly in two aspects: recycling the valuable metals and producing new materials such as wear-resistant materials. Tungsten slag contains valuable metal elements, such as W, Nb, Ta, etc., and the extraction methods include mineral processing, pyrometallurgy, wet leaching, etc. However, since the smelting process changes the physical structure of the mineral or the chemical form of certain components, it is difficult to recycle tungsten slag by mineral processing methods. When the traditional wet method, pyrometallurgy or wet-pyrometallurgy combined technology is used to recover the valuable metals, there are problems such as high recovery cost and poor economic benefits, which leads to the low comprehensive utilization rate of tungsten slag and large-scale natural stacking, which not only causes serious environmental pollution, but also makes a large number of valuable metal resources unable to be reasonably utilized, resulting in waste and loss of tungsten resources. Tungsten slag contains important alloying elements such as W, Mn, and Nb. Among them, W and Nb have a greater affinity with C and often combine with C to form corresponding carbides. They all have high melting points. In the crystallization process of molten iron, these high-melting-point carbides usually play the role of external crystallization cores, and can often refine the primary crystal structure, thereby improving wear resistance. Therefore, tungsten slag can be used to produce wear-resistant materials such as wear-resistant balls, improve the life of wear-resistant parts, and has many advantages such as simple process and low cost. However, it does not take the recovery of valuable metal elements in tungsten slag into consideration.

[0004] Therefore, the targeted development of a method for comprehensive utilization of tungsten slag, or even low-grade polymetallic slag solid waste and other valuable resources, has important practical significance for the development of my country's tungsten industry and national economy. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology and provide a method for comprehensive resource utilization of organic-inorganic solid waste synergistically.

[0006] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0007] A method for comprehensive resource utilization of organic and inorganic solid wastes in coordination, comprising the following steps:

[0008] The ground tungsten slag, leather sludge and chlorinating agent are mixed, and then the mixed material is ball-milled and mixed to produce pellets; wherein the mass ratio of the tungsten slag to the leather sludge is 100:(3-8), and the amount of the chlorinating agent added is 5%-12% of the total weight of the tungsten slag and the leather sludge;

[0009] The pellets are preheated, and then heated to the roasting temperature at a set heating rate, chlorination roasting is performed, and the volatilized smoke is collected; wherein the preheating temperature is 300°C to 500°C, the heating rate is 5 to 10°C / min, and the roasting temperature is 1000°C to 1400°C.

[0010] As a further improvement, the chlorinating agent is one or more of sodium chloride, calcium chloride, magnesium chloride, ammonium chloride or hydrochloric acid.

[0011] As a further improvement, the chlorinating agent is ammonium chloride.

[0012] As a further improvement, the mass ratio of the tungsten slag to the leather sludge is 100:6; and / or the amount of the chlorinating agent added is 8% of the total weight of the tungsten slag and the leather sludge.

[0013] As a further improvement, the ball milling time is 20 to 30 minutes, and the particle size of the mixed material after ball milling is ≤200 mesh.

[0014] As a further improvement, the pelletizing process obtains pellets with a moisture content of 5% to 9% and an average particle size of 8 mm to 15 mm.

[0015] As a further improvement, the preheating time is 20 min to 60 min; and / or the roasting time is 60 min to 120 min.

[0016] As a further improvement, the calcination temperature is 1250°C.

[0017] As a further improvement, the volatilized smoke is collected after leaching, and then subjected to chlorination leaching to obtain a leachate and a leaching residue, wherein tin and chromium enter the leachate, and tungsten, tantalum and niobium enter the leaching residue; the leaching residue is treated with an ammonia leaching method, tungsten enters the liquid phase, and tantalum and niobium are enriched as tantalum-niobium concentrate; the leachate is subjected to graded neutralization precipitation to first precipitate tin and then chromium.

[0018] As a further improvement, the calcined slag is subjected to water quenching, ball milling and magnetic separation to obtain an iron-manganese alloy.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] Leather sludge has a large amount of organic matter and high leaching toxicity (Cr). It can be used as a binder in the ball-making process during the chlorination and volatilization of tungsten slag, and can also be used as a valuable metal reducing agent to achieve the separation process and detoxify heavy metals (Cr). No external reducing agent or binder is required.

[0021] Balling the tungsten slag before high-temperature chlorination roasting is beneficial to uniform mixing, uniform particle size, maintaining good air permeability, making the reaction complete, improving the separation and enrichment efficiency of valuable metals such as W, Sn, Nb, Bi during high-temperature chlorination roasting, and is beneficial to the detoxification of heavy metal chromium. The produced pellets have high compressive strength and are not easy to break, which is beneficial to improving the grade of the Fe / Mn pellets produced after roasting and improving the recovery rate of Fe / Mn.

[0022] The present invention adopts two solid wastes, tungsten slag and leather sludge, and organic-inorganic synergistic coordination to provide a process with stable technology, simple operation and low cost. It can make full use of the organic matter contained in the leather sludge, effectively improve the pyrometallurgical enrichment efficiency of the valuable elements in the tungsten slag, improve the comprehensive utilization efficiency of resources such as tungsten slag, and also reduce the leaching toxicity of chromium in the leather sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a process flow chart of the present invention;

[0025] Figure 2 The effect of leather sludge addition on the volatilization rate of each metal and heavy metal detoxification at 1250℃;

[0026] Figure 3 The effect of the percentage of chlorinating agent after adding 6% leather sludge on the metal volatilization rate and heavy metal detoxification at 1250℃;

[0027] Figure 4 The metal volatilization rate and heavy metal detoxification effect at different temperatures are 6% leather sludge-8% chlorinating agent addition;

[0028] Figure 5 The effect of the percentage of chlorinating agent on the volatility of each metal when the temperature is 1250℃ and the temperature is 0% leather sludge;

[0029] Figure 6 The effect of roasting temperature on the volatilization rate of each metal when 0% leather sludge-10% chlorinating agent. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and meticulously below in conjunction with the accompanying drawings and preferred embodiments of the present invention, but the protection scope of the present invention is not limited to the following specific embodiments.

[0031] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0032] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0033] Tungsten slag refers to the leached slag produced by the wet smelting process of various types of tungsten mineral raw materials. The current tungsten smelting process in my country is mainly based on alkali leaching, so the tungsten slag commonly referred to refers to tungsten alkali leaching slag. The tungsten slag in the following embodiments is tungsten alkali leaching slag. In the tungsten slag treated in the following embodiments of the present invention, the total iron content is 7.09% to 10.01%, the Mn content is 1.06 to 1.53%, the W content is 0.61% to 0.95%, and the Sn content is 0.55% to 1.49%. The particle size of the tungsten slag is ≤200 mesh

[0034] Leather sludge is waste residue produced during sewage purification in the leather making process. In the leather sludge treated in the following embodiments of the present invention, the total iron content is 48.94% to 53.65%, the Cr content is 2.59% to 3.13%, and the particle size of the leather sludge is ≤150 mesh.

[0035] During the pelletizing process, leather sludge contains a large amount of organic matter, which serves as a binder; during chlorination roasting, the organic matter decomposes at high temperature, and after the volatile products escape, the remaining non-volatile product is coke, which serves as a reducing agent. Therefore, in the present invention, leather sludge serves as both a binder and a reducing agent, as well as hazardous waste to be treated, and at the same time, the separation of valuable metals in tungsten slag and the detoxification of heavy metals (Cr) in leather sludge are achieved.

[0036] like Figure 1 As shown, the method for comprehensive resource utilization of organic-inorganic solid wastes in the present invention mainly includes two processes, pre-balling treatment and high-temperature chlorination roasting, which specifically include the following steps:

[0037] Step 1: Pre-treatment of pelletizing: Mix the ground tungsten slag powder, leather sludge and chlorinating agent in a certain proportion, then ball mill the mixture to mix evenly and produce pellets.

[0038] In some embodiments, the mass ratio of tungsten slag to leather sludge is 100:(3-8), preferably 100:6.

[0039] In some embodiments, the chlorinating agent is added at 5% to 12% (preferably 8%) of the total weight of the tungsten slag and leather sludge.

[0040] In some embodiments, the chlorinating agent used is one or more of sodium chloride, calcium chloride, magnesium chloride, ammonium chloride, hydrochloric acid, etc. Preferably, one or two of ammonium chloride, hydrochloric acid or calcium chloride are used, and ammonium chloride is more preferred. When ammonium chloride is used as the chlorinating agent, the ammonium radical will volatilize during the high temperature process, which is beneficial to reduce the formation of slag.

[0041] In some embodiments, dry ball milling is used, the ball milling time is 20 to 30 minutes, and the particle size of the mixed material after ball milling is ≤ 200 mesh.

[0042] In some embodiments, during the pelletizing process, the speed of the pelletizing machine is set to 1500-1600 r / min, and water is added to the pelletizing machine at the same time, and the water amount is set to 9%-11% of the feed weight (in the following embodiments 1-3, the speed of the pelletizing machine is 1500 r / min, and the water amount is set to 9.5% of the feed weight), to obtain pellets with a moisture content of 5%-9% and an average particle size of 8mm-15mm.

[0043] Step 2: High-temperature chlorination roasting: The operation is carried out in stages. The pellets are first preheated, and then heated to the roasting temperature at a certain heating rate, and chlorination roasting is carried out to achieve the enrichment of valuable metals and detoxification of heavy metals.

[0044] A high-temperature tubular furnace can be used for chlorination roasting. During the roasting process, the roasting equipment is sealed (for example, the valve of the high-temperature tubular furnace is closed during the roasting process), and the volatile smoke (enriched flue gas) is collected after the reaction is completed.

[0045] Sn / W / Nb / Bi in tungsten slag mainly exist in the form of oxides. Cr in leather sludge mainly exists in the form of oxides. Among them, the boiling points of the oxides of Sn / W / Nb / Bi / Cr are very high, and the boiling points of the chlorides are all relatively low, and the boiling point of Cr chloride is the highest. The process involved in the present invention takes tin as an example: the tin element in the form of tin dioxide (boiling point 1800°C) in the tungsten slag reacts with a reducing agent (coke generated by high-temperature carbonization of organic matter in leather sludge) to generate stannous oxide (boiling point 1080°C), and stannous oxide further reacts with a chlorinating agent to generate stannous chloride with a lower boiling point (boiling point 623°C), and the stannous chloride volatilizes into the gas (stannous oxide may also partially volatilize), thereby separating most of the tin from the slag.

[0046] In some embodiments, the preheating temperature is 300° C. to 500° C., and the preheating time is 20 min to 60 min. The purpose of preheating is to dry and improve the compressive strength of the pellets.

[0047] In some embodiments, the heating rate is 5-10°C / min, the roasting time is set to 60min-120min, and the roasting temperature is 1000°C-1400°C (preferably 1250°C). The heating rate will affect the coke yield of organic matter. The higher the heating rate, the lower the yield. Preferably, it is 5-10°C / min.

[0048] In some embodiments, the volatilized flue gas is subjected to a leaching process (with water), the leaching liquid is filtered out, the smoke dust is collected, and the collected smoke dust is subjected to chlorination leaching (dilute hydrochloric acid) to obtain a leaching liquid and a leaching residue, tin enters the leaching liquid, and tungsten, tantalum and niobium enter the leaching residue. The leaching residue is treated by ammonia leaching, tungsten is dissolved in ammonia water and enters the liquid phase, and tantalum and niobium are enriched as tantalum and niobium concentrates. The step-by-step separation of valuable metals is achieved.

[0049] Among them, Cr chloride volatilizes with the flue gas. After being leached, chromium chloride reacts chemically with water to form chromium precipitate, which is collected with the flue gas. After chlorination leaching, Cr and Sn enter the leachate together. Through graded neutralization precipitation, Sn is precipitated first and then Cr, to achieve the detoxification of heavy metal Cr.

[0050] After the chlorination roasting, iron and manganese are reduced to elemental state, and the reactant (roasting slag) is quenched with water to obtain water-quenched slag. After the particle size is reduced by ball milling, the iron-manganese alloy is separated by magnetic separation.

[0051] Embodiment 1:

[0052] The raw material of the tungsten slag used in the experiment is a dried high-tin tungsten slag, containing 1.40% tin, 1.47% manganese, 8.64% iron, and 0.61% tungsten. The chromium leaching toxicity in the leather sludge used in the experiment is 71.1 mg / L (determined after digestion with reference to "HJ / T299-2007", "GB5085.3-2007"), and the total iron content is about 52%. The ground tungsten slag and leather sludge are mixed in the ratio of 100:3, 100:4, 100:5, 100:6, 100:7, and 100:8, and then ammonium chloride is added according to 8% of the total amount of tungsten slag and leather sludge. After mixing, the mixed material is placed in a ball mill for fine grinding and mixing, the ball milling time is set to 20 minutes, and the particle size of the mixed material after ball milling is ≤200 mesh; the ball-milled and mixed mixed material is transferred to a disc ball making machine, and pellets are produced to obtain pellets with a moisture content of 8% and an average particle size of 8.5 mm to 13.7 mm; high-temperature chlorination roasting, the pellets are neatly spread in a porcelain boat, placed in a high-temperature tubular furnace, and staged operation is performed. The pellets are first preheated, the preheating temperature is 350°C, the preheating time is 30 minutes, the heating rate is 10°C / min, the roasting time is set to 90 minutes, and the roasting temperature is 1250°C. Detect the content of Sn / W / Nb / Bi in the volatile flue gas and calculate the volatility, detect the total chromium content in the roasted slag and calculate the leaching toxicity (refer to "HJ / T299-2007", "GB 5085.3-2007" to weigh the roasted slag after digestion, then take a small amount of roasted slag and digest it to determine the element content, then calculate the content of the elements in the roasted slag, and compare it with the original slag for calculation), such as Figure 2 After roasting, the highest volatilization rates of Sn / W / Nb / Bi reached 93.91%, 91.92%, 91.93% and 89.52% respectively, and the lowest total chromium leaching toxicity was 6.23 mg / L. The appropriate amount of leather sludge added is 6% of the mass of tungsten slag. At this time, the volatilization rates of Sn / W / Nb / Bi are 92.86%, 91.92%, 89.43% and 86.29% respectively, and the total chromium leaching toxicity is 11.23 mg / L, which meets the national hazardous waste standards.

[0053] The volatile flue gas is washed with water, and the collected flue dust is subjected to chlorination leaching (dilute hydrochloric acid) to obtain leaching solution and leaching residue. Cr and Sn enter the leaching solution, and tungsten, tantalum and niobium enter the leaching residue. The leaching residue is treated by ammonia leaching, tungsten is dissolved in ammonia water and enters the liquid phase, and tantalum and niobium are enriched as tantalum and niobium concentrate. The leaching solution is subjected to graded neutralization precipitation to first precipitate Sn and then Cr.

[0054] The roasted slag is water quenched to obtain water-quenched slag, which is ball milled to reduce the particle size, and then the iron-manganese alloy is separated by magnetic separation.

[0055] Embodiment 2:

[0056] The raw material of the tungsten slag used in the experiment is dried high-tin tungsten slag, containing 1.40% tin, 1.47% manganese, 8.64% iron, and 0.61% tungsten. The chromium leaching toxicity in the leather sludge used in the experiment is 71.1 mg / L, and the total iron content is about 52%. The ground tungsten slag and leather sludge are mixed at a ratio of 100:6, and then ammonium chloride is added at 5%, 6%, 8%, 10%, and 12% of the total amount of tungsten slag and leather sludge. After mixing, the mixed materials are put into a ball mill for fine grinding and mixing. The ball milling time is set to 20 minutes. The particle size of the mixed materials after ball milling is ≤200 meshes. The mixed materials after ball milling and mixing are transferred to a disc ball making machine to produce pellets, and the moisture content is 9% and the average particle size is 9.5mm-12.9mm. High-temperature chlorination roasting, the pellets are neatly spread in a porcelain boat, placed in a high-temperature tubular furnace, and operated in stages. The pellets are first preheated at a preheating temperature of 350°C, a preheating time of 30 minutes, a heating rate of 10°C / min, and a roasting time of 90 minutes and a roasting temperature of 1250°C. Figure 3 After roasting, the volatilization rates of Sn / W / Nb / Bi reached 92.86%, 91.92%, 89.43%, and 86.29% respectively, and the total chromium leaching toxicity was as low as 8.93 mg / L. The appropriate amount of chlorinating agent added was 8% of the total amount of tungsten slag and leather sludge. At this time, the volatilization rates of Sn / W / Nb / Bi were 92.86%, 91.92%, 89.43%, and 86.29% respectively, and the total chromium leaching toxicity was 11.23 mg / L, which met the national hazardous waste standards.

[0057] Embodiment 3:

[0058] The raw material of the tungsten slag used in the experiment is dried high-tin tungsten slag, containing 1.40% tin, 1.47% manganese, 8.64% iron, and 0.61% tungsten. The chromium leaching toxicity in the leather sludge used in the experiment is 71.1 mg / L, and the total iron content is about 52%. The ground tungsten slag and leather sludge are mixed at a ratio of 100:6, and then ammonium chloride is added at 8% of the total amount of tungsten slag and leather sludge. After mixing, the mixed materials are placed in a ball mill for fine grinding and mixing. The ball milling time is set to 20 minutes. The particle size of the mixed materials after ball milling is ≤200 meshes. The ball-milled and mixed mixed materials are transferred to a disc ball making machine to produce pellets, and the moisture content is 6% and the average particle size is 10.1mm-14.6mm. High-temperature chlorination roasting, the pellets are neatly spread in a porcelain boat, placed in a high-temperature tubular furnace, and operated in stages. The pellets are first preheated at a preheating temperature of 350°C, a preheating time of 30 minutes, a heating rate of 10°C / min, and a roasting time of 90 minutes. The roasting temperatures are set to 1000°C, 1050°C, 1100°C, 1150°C, 1200°C, 1250°C, 1300°C, 1350°C, and 1400°C, respectively. Figure 4 After roasting, the volatilization rates of Sn / W / Nb / Bi reached 94.13%, 91.92%, 89.43%, and 86.29% respectively, and the total chromium leaching toxicity was the lowest at 4.01 mg / L. The best roasting temperature was 1250°C, at which the volatilization rates of Sn / W / Nb / Bi were 92.86%, 91.92%, 89.43%, and 86.29% respectively, and the total chromium leaching toxicity was 11.23 mg / L, which met the national hazardous waste standards.

[0059] Comparative Example 1:

[0060] The raw material of the tungsten slag used in the experiment is a dried high-tin tungsten slag, containing 1.40% tin, 1.47% manganese, 8.64% iron, and 0.61% tungsten. The chromium leaching toxicity in the leather sludge used in the experiment is 71.1 mg / L, and the total iron content is about 52%. Ammonium chloride is added at 5%, 6%, 8%, 10%, and 12% of the total amount of tungsten slag, and no leather sludge is added. After mixing, the mixed materials are put into a ball mill for fine grinding and mixing. The ball milling time is set to 20 minutes. The particle size of the mixed materials after ball milling is ≤200 meshes. The mixed materials after ball milling and mixing are transferred to a disc ball making machine to produce pellets, and the moisture content is 7% and the average particle size is 9.5mm-14.2mm. The pellets are neatly spread in a porcelain boat and placed in a high-temperature tubular furnace for segmented operation. The pellets are first preheated at a preheating temperature of 350°C, a preheating time of 30 minutes, a heating rate of 10°C / min, and a roasting time of 90 minutes and a roasting temperature of 1250°C. Figure 5 After calcination, the highest volatilization rates of Sn / W / Nb / Bi are 53.62%, 49.11%, 69.23%, and 49.83%, respectively. The optimal addition amount of chlorinating agent is 10%, at which time the volatilization rates of Sn / W / Nb / Bi are 51.82%, 48.51%, 69.23%, and 49.83%, respectively. However, the volatilization rate of metal is low.

[0061] Comparative Example 2:

[0062] The raw material of the tungsten slag used in the experiment is a dried high-tin tungsten slag, containing 1.40% tin, 1.47% manganese, 8.64% iron, and 0.61% tungsten. The chromium leaching toxicity in the leather sludge used in the experiment is 71.1 mg / L, and the total iron content is about 52%. Ammonium chloride is added according to 10% of the total amount of tungsten slag, and no leather sludge is added. After mixing, the mixed materials are placed in a ball mill for fine grinding and mixing. The ball milling time is set to 20 minutes. The particle size of the mixed materials after ball milling is ≤200 meshes. The ball-milled and mixed mixed materials are transferred to a disc ball making machine to produce pellets, and the moisture content is 9% and the average particle size is 11.2mm-13.2mm. High-temperature chlorination roasting, the pellets are neatly spread in a porcelain boat, placed in a high-temperature tubular furnace, and operated in stages. The pellets are first preheated at a preheating temperature of 350°C, a preheating time of 30 minutes, a heating rate of 10°C / min, and a roasting time of 90 minutes. The roasting temperatures are set to 1000°C, 1050°C, 1100°C, 1150°C, 1200°C, 1250°C, 1300°C, 1350°C, and 1400°C, respectively. Figure 6 After calcination, the highest volatilization rates of Sn / W / Nb / Bi are 51.82%, 48.51%, 69.23% and 49.83% respectively. The most suitable calcination temperature is 1250℃, at which the volatilization rates are 51.82%, 48.51%, 69.23% and 49.83% respectively, but the metal volatilization rate is low.

[0063] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for comprehensive resource utilization of organic and inorganic solid wastes, characterized in that: The steps include: The ground tungsten slag, leather sludge and chlorinating agent are mixed, and then the mixed materials are ball-milled and balled to produce pellets; wherein the mass ratio of tungsten slag to leather sludge is 100:(3-8), and the amount of chlorinating agent added is 5%-12% of the total weight of tungsten slag and leather sludge; The pellets are preheated, and then heated to the roasting temperature at a set heating rate, and chlorination roasting is performed. The volatilized smoke is washed with water and the smoke is collected. The preheating temperature is 300°C~500°C, the heating rate is 5~10°C / min, and the roasting temperature is 1000°C~1400°C.

2. The method for comprehensive resource utilization of organic-inorganic solid wastes according to claim 1, characterized in that: The chlorinating agent is one or more of sodium chloride, calcium chloride, magnesium chloride, ammonium chloride or hydrochloric acid.

3. The method for comprehensive resource utilization of organic-inorganic solid waste synergistic cooperation according to claim 2 is characterized in that: The chlorinating agent is ammonium chloride.

4. The method for comprehensive resource utilization of organic-inorganic solid wastes according to any one of claims 1 to 3, characterized in that: The mass ratio of the tungsten slag to the leather sludge is 100:6; and / or the amount of the chlorinating agent added is 8% of the total weight of the tungsten slag and the leather sludge.

5. The method for comprehensive resource utilization of organic-inorganic solid wastes according to any one of claims 1 to 3, characterized in that: The ball milling time is 20-30 minutes, and the particle size of the mixed material after ball milling is ≤200 meshes.

6. The method for comprehensive resource utilization of organic-inorganic solid wastes according to any one of claims 1 to 3, characterized in that: The pelletizing method obtains pellets with a moisture content of 5% to 9% and an average particle size of 8 mm to 15 mm.

7. The method for comprehensive resource utilization of organic-inorganic solid wastes according to any one of claims 1 to 3, characterized in that: The preheating time is 20 min to 60 min; and / or the roasting time is 60 min to 120 min.

8. The method for comprehensive resource utilization of organic-inorganic solid wastes according to any one of claims 1 to 3, characterized in that: The calcination temperature is 1250°C.

9. The method for comprehensive resource utilization of organic-inorganic solid wastes according to any one of claims 1 to 3, characterized in that: The volatilized smoke is collected after leaching, and then subjected to chlorination leaching to obtain a leachate and a leachate residue, wherein tin and chromium enter the leachate, and tungsten, tantalum and niobium enter the leachate residue; The leaching residue is treated with ammonia leaching method, tungsten enters the liquid phase, and tantalum and niobium are enriched as tantalum and niobium concentrate; the leaching solution is subjected to graded neutralization precipitation to first precipitate tin and then chromium.

10. The method for comprehensive resource utilization of organic-inorganic solid wastes according to any one of claims 1 to 3, characterized in that: The calcined slag is subjected to water quenching, ball milling and magnetic separation to obtain an iron-manganese alloy.

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