Method for collaborative treatment of arsenic-containing desulfurized gypsum slag by organic solid waste

Abstract

The present invention provides a method for the coordinated treatment of arsenic-containing desulfurized gypsum slag by organic solid waste. A medium-temperature pyrolysis furnace obtains a mixture containing arsenic-containing desulfurized gypsum slag, pyrite, and an external carbon source, heats and carbonizes the external carbon source in the mixture, and outputs the carbonized mixture. A high-temperature pyrolysis furnace obtains the carbonized mixture, pyrolyzes the carbonized mixture, and outputs a first arsenic-containing gas and a low-arsenic residue, respectively. A condensation arsenic collection chamber obtains the first arsenic-containing gas and outputs a first refined white arsenic. The present invention provides a method for the coordinated treatment of arsenic-containing desulfurized gypsum slag by organic solid waste. The method can treat the arsenic-containing desulfurized gypsum slag to convert it into a low-arsenic residue that is easy to handle; collect the first refined white arsenic to effectively recycle resources; reduce the generation of harmful gases and equipment corrosion; and reduce the amount of pyrite used to reduce costs.

Description

Technical Field

[0001] The present invention relates to the technical field of hazardous solid waste treatment, and in particular to a method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste. Background Art

[0002] Arsenic-containing desulfurization gypsum slag, also known as arsenic-calcium slag, contains arsenic mainly in the form of calcium arsenate and arsenic oxide. The moisture content of the arsenic-containing desulfurization gypsum slag to be treated in this application is about 5%. Arsenic-containing desulfurization gypsum slag mainly comes from the non-ferrous metal smelting and chemical industries, and is a hazardous solid waste. If it is not effectively disposed of, it will cause secondary pollution to the environment, mainly to the soil, groundwater resources, etc. It is estimated that China's copper smelting industry produces about 500,000 tons of arsenic-containing desulfurization gypsum slag every year, and the entire Chinese non-ferrous smelting industry has accumulated thousands of tons of arsenic-containing waste over the years. The treatment and disposal of arsenic-containing desulfurization gypsum slag (arsenic-calcium slag) has become a topic of high social concern. Arsenic-containing desulfurization gypsum slag urgently needs to be harmlessly treated or recycled, which is of great significance.

[0003] At present, the main methods for treating arsenic-containing desulfurization gypsum slag (arsenic-calcium slag) in China include: stockpiling, cement solidification, chemical solidification, and high-temperature reduction decomposition. Among them, stockpiling is the most commonly used method for most companies, but stockpiling has extremely high requirements for the storage slag site and is also quite difficult to maintain. Cement solidification can reduce the toxic leaching of the waste slag to a range that meets the national toxic leaching requirements, but there is a large volume expansion ratio, and the treated slag cannot be used as a resource. Chemical solidification currently has poor adaptability and is only carried out in the laboratory for some raw materials. It cannot be applied industrially at present. High-temperature reduction decomposition usually uses pyrite to pyrolyze arsenic-containing desulfurization gypsum slag, which requires a large amount of pyrite. Pyrite itself is expensive and has high cost. It also produces a large amount of sulfur dioxide, which corrodes equipment.

[0004] Therefore, it is necessary to provide a method for co-processing arsenic-containing desulfurization gypsum slag with organic solid waste to solve the above technical problems. Summary of the Invention

[0005] The present invention provides a method for the coordinated treatment of arsenic-containing desulfurized gypsum slag with organic solid waste, which can treat the arsenic-containing desulfurized gypsum slag to convert it into a low-arsenic residue that is easy to treat; can collect the first refined white arsenic and effectively recycle resources; can reduce the generation of harmful gases and reduce equipment corrosion; and can reduce the amount of pyrite used and reduce costs.

[0006] The technical solution of the present invention is:

[0007] A method for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste, which uses an organic solid waste co-processing arsenic-containing desulfurized gypsum slag equipment for processing. The organic solid waste co-processing arsenic-containing desulfurized gypsum slag equipment comprises:

[0008] A medium-temperature pyrolysis furnace is provided with a medium-temperature furnace inlet and a medium-temperature furnace material outlet; the medium-temperature furnace inlet is used to input a mixed material containing arsenic-containing desulfurized gypsum slag, pyrite and an external carbon source; the medium-temperature furnace material outlet is used to output the carbonized mixed material;

[0009] A high-temperature pyrolysis furnace is provided with a high-temperature furnace inlet, a high-temperature furnace gas outlet, and a high-temperature furnace material outlet; the high-temperature furnace inlet is connected to the medium-temperature furnace material outlet; the high-temperature furnace gas outlet is used to output a first arsenic-containing gas; the high-temperature furnace material outlet is used to output a low-arsenic residue; and,

[0010] A condensation arsenic collection chamber is provided with a condensation inlet and a condensed solids outlet; the condensation inlet is connected to the high-temperature furnace gas outlet; the condensed solids outlet is used to output the first refined white arsenic;

[0011] The method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste comprises:

[0012] S11, the medium-temperature pyrolysis furnace obtains a mixture containing arsenic-containing desulfurized gypsum slag, pyrite, and an external carbon source, and inputs the mixture into the medium-temperature pyrolysis furnace through the medium-temperature furnace inlet; the medium-temperature pyrolysis furnace heats and carbonizes the external carbon source of the mixture, and outputs the carbonized mixture through the medium-temperature furnace material outlet;

[0013] S12, the high-temperature pyrolysis furnace obtains a carbonized mixed material and inputs it into the high-temperature pyrolysis furnace through the high-temperature furnace inlet, the high-temperature pyrolysis furnace pyrolyzes the carbonized mixed material, and outputs a first arsenic-containing gas through the high-temperature furnace gas outlet, and outputs a low-arsenic residue through the high-temperature furnace material outlet; and

[0014] S13, the condensation arsenic collection chamber obtains the first arsenic-containing gas, and inputs it into the condensation arsenic collection chamber through the condensation inlet, and outputs the first refined white arsenic through the condensation solid outlet.

[0015] In the method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste described in the present invention, in step S12, the molar ratio is Ca3(AsO4)2:FeS2:C:O2=1:1.3~1.7:0.9~1.1:4.5~5.5.

[0016] In the method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste described in the present invention, the external carbon source in the mixed material obtained by the medium-temperature pyrolysis furnace is municipal sludge, lake bottom sludge and river bottom sludge.

[0017] In the method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste according to the present invention, in step S12, low-arsenic residue containing arsenite is output through the material outlet of the high-temperature furnace.

[0018] In the method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste described in the present invention, in step S11, the temperature of the medium-temperature pyrolysis furnace is set to 300°C-450°C; in step S12, the temperature of the high-temperature pyrolysis furnace is set to 750°C-950°C.

[0019] In the method for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste according to the present invention, the equipment for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste further comprises a mixer, which is provided with a first mixing inlet, a second mixing inlet, a third mixing inlet and a mixing outlet; the first mixing inlet is used to input an external carbon source; the second mixing inlet is used to input pyrite; the third mixing inlet is used to input arsenic-containing desulfurized gypsum slag; and the mixing outlet is used to output a mixture containing arsenic-containing desulfurized gypsum slag, pyrite and an external carbon source;

[0020] The method for the coordinated treatment of arsenic-containing desulfurization gypsum slag with organic solid waste also includes step S14, the mixer obtains an external carbon source, pyrite and arsenic-containing desulfurization gypsum slag, and inputs the external carbon source into the mixer through the first mixing inlet, inputs pyrite into the mixer through the second mixing inlet, and inputs arsenic-containing desulfurization gypsum slag into the mixer through the third mixing inlet, the mixer mixes the external carbon source, pyrite and dried arsenic-containing desulfurization gypsum slag, and outputs a mixture containing arsenic-containing desulfurization gypsum slag, pyrite and the external carbon source through the mixing outlet; step S14 is located before step S11.

[0021] In the method for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste according to the present invention, the equipment for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste further comprises a first drying machine, which is provided with a first drying inlet and a first dried material outlet; the first drying inlet is used to input an external carbon source; the first dried material outlet is used to output a semi-dried external carbon source;

[0022] The method for the coordinated treatment of arsenic-containing desulfurized gypsum slag by organic solid waste also includes step S15, the first dryer obtains an external carbon source, and inputs the external carbon source into the first dryer through the first drying inlet, dries the external carbon source, and outputs the semi-dry external carbon source through the first drying material outlet; the step S15 is located before the step S14.

[0023] In the method for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste according to the present invention, the equipment for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste further comprises a second drying machine, which is provided with a second drying inlet and a second dried material outlet; the second drying inlet is connected to the mixed material outlet; the second dried material outlet is used to output the dehydrated mixed material;

[0024] The method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste also includes step S16, the second dryer obtains the mixed material, and inputs the mixed material into the second dryer through the second drying inlet, dries the mixed material, and outputs the dehydrated mixed material through the second drying material outlet; the step S16 is located after the step S14 and before the step S11.

[0025] In the method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste according to the present invention, the condensation arsenic collection chamber further comprises a condensation gas outlet for outputting the second arsenic-containing gas;

[0026] The organic solid waste collaborative treatment arsenic-containing desulfurized gypsum slag equipment also includes a bag dust collector, which includes a dust collector inlet and a dust collector solid outlet; the dust collector inlet is connected to the condensed gas outlet; the dust collector solid outlet is used to output the second refined white arsenic;

[0027] The method for the coordinated treatment of arsenic-containing desulfurized gypsum slag with organic solid waste also includes step S17, the bag dust collector obtains a second arsenic-containing gas and inputs it into the bag dust collector through the dust collector inlet, the bag dust collector processes the second arsenic-containing gas and outputs a second refined white arsenic through the dust collector solid outlet; step S17 is located after step S13.

[0028] In the method for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste according to the present invention, the equipment for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste further comprises a high-temperature filter, which is provided with a filter inlet and a filter gas outlet; the filter inlet is connected to the high-temperature furnace gas outlet; the filter gas outlet is connected to the condensation inlet;

[0029] The method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste also includes step S18, wherein the high-temperature filter obtains a first arsenic-containing gas and inputs the gas into the high-temperature filter through the filter inlet, the high-temperature filter performs high-temperature dust removal on the first arsenic-containing gas, and outputs the first arsenic-containing gas filtered of dust through the filter gas outlet; step S18 is located before step S13 and after step S12.

[0030] Compared with the prior art, the present invention has the following beneficial effects: the method of the present invention for the coordinated treatment of arsenic-containing desulfurized gypsum slag with organic solid waste first carbonizes the external carbon source in the mixed material through a medium-temperature pyrolysis furnace and outputs the carbonized mixed material, and then pyrolyzes the carbonized mixed material through a high-temperature pyrolysis furnace. In this process, arsenic oxide becomes gaseous, carbon, calcium arsenate and ferrous disulfide react, most of the calcium arsenate is decomposed, and the arsenic in the calcium arsenate is converted into gaseous arsenic oxide. The high-temperature furnace gas outlet and the high-temperature furnace material outlet respectively output a first arsenic-containing gas and a low-arsenic residue. The first arsenic-containing gas can be processed by a condensation arsenic collection chamber to obtain a first refined white arsenic. The reaction of carbon, ferrous disulfide and calcium arsenate can reduce the production of harmful sulfur dioxide gas, reduce the degree of equipment corrosion, and reduce the amount of pyrite used, thereby reducing costs. The method for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste of the present invention can process the arsenic-containing desulfurized gypsum slag to convert it into a low-arsenic residue that is easy to process; can collect the first refined white arsenic to effectively recycle resources; can reduce the generation of harmful gases and reduce equipment corrosion; and can reduce the amount of pyrite used to reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the present invention.

[0032] Figure 1 This is a flow chart of a method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste provided in a preferred embodiment of the present invention.

[0033] Figure 2 This is a structural block diagram of an organic solid waste collaborative treatment equipment for arsenic-containing desulfurized gypsum slag provided in a preferred embodiment of the present invention.

[0034] in,

[0035] 11. Medium temperature pyrolysis furnace,

[0036] 12. High temperature pyrolysis furnace,

[0037] 13. Condensation arsenic collection room,

[0038] 14. Mixer,

[0039] 15. The first drying machine,

[0040] 16. Second drying machine,

[0041] 17. Bag dust collector,

[0042] 18. High temperature filter.

[0043] In the figures, structurally similar elements are denoted by the same reference numerals. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0045] Directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only used with reference to the directions of the drawings. The directional terms used are used to illustrate and understand the present invention, and are not used to limit the present invention.

[0046] The terms "first" and "second" in the present invention are used for descriptive purposes only and should not be understood as indicating or implying relative importance, and should not be used as a limitation on the order of precedence.

[0047] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0048] In the prior art, pyrite is used to pyrolyze arsenic-containing desulfurized gypsum slag, which requires a large amount of pyrite. Pyrite itself is expensive and has high costs, and it also produces a large amount of sulfur dioxide, which corrodes equipment.

[0049] The following is a preferred embodiment of a method for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste, which can solve the above technical problems, provided by the present invention.

[0050] Please refer to Figure 2The method for co-processing arsenic-containing desulfurized gypsum slag using organic solid waste co-processing equipment for arsenic-containing desulfurized gypsum slag is described. The equipment includes a medium-temperature pyrolysis furnace 11, a high-temperature pyrolysis furnace 12, and a condensation arsenic collection chamber 13. The medium-temperature pyrolysis furnace 11 is provided with a medium-temperature furnace inlet and a medium-temperature furnace material outlet. The medium-temperature furnace inlet is used to input a mixture containing arsenic-containing desulfurized gypsum slag, pyrite, and an external carbon source. The medium-temperature furnace material outlet is used to output the carbonized mixture. The high-temperature pyrolysis furnace 12 is provided with a high-temperature furnace inlet, a high-temperature furnace gas outlet, and a high-temperature furnace material outlet. The high-temperature furnace inlet is connected to the medium-temperature furnace material outlet. The high-temperature furnace gas outlet is used to output a first arsenic-containing gas. The high-temperature furnace material outlet is used to output a low-arsenic residue. The condensation arsenic collection chamber 13 is provided with a condensation inlet and a condensed solids outlet; the condensation inlet is connected to the high-temperature furnace gas outlet. The condensed solids outlet is used to output a first refined white arsenic.

[0051] Please refer to Figure 1 The method for co-processing arsenic-containing desulfurization gypsum slag with organic solid waste includes:

[0052] S11, the medium-temperature pyrolysis furnace 11 obtains a mixture containing arsenic-containing desulfurized gypsum slag, pyrite, and an external carbon source, and inputs the mixture into the medium-temperature pyrolysis furnace 11 through the medium-temperature furnace inlet. The medium-temperature pyrolysis furnace 11 heats and carbonizes the external carbon source of the mixture, and outputs the carbonized mixture through the medium-temperature furnace material outlet;

[0053] S12, the high-temperature pyrolysis furnace 12 obtains a carbonized mixed material and inputs it into the high-temperature pyrolysis furnace 12 through the high-temperature furnace inlet. The high-temperature pyrolysis furnace 12 pyrolyzes the carbonized mixed material and outputs a first arsenic-containing gas through the high-temperature furnace gas outlet and outputs a low-arsenic residue through the high-temperature furnace material outlet; and

[0054] S13, the condensation arsenic collection chamber 13 obtains the first arsenic-containing gas, and inputs it into the condensation arsenic collection chamber 13 through the condensation inlet, and outputs the first refined white arsenic through the condensation solid outlet.

[0055] The chemical reactions that may occur in the high-temperature pyrolysis furnace 12 are as follows:

[0056] 2Ca3(AsO4)2+3FeS2+C+10.25O2(g)=6CaSO4+1.5Fe2O3+As4O6(g)+CO2(g)

[0057] 2Ca3(AsO4)2+3FeS2+C+10O2(g)=6CaSO4+Fe3O4+As4O6(g)+CO2(g)

[0058] 2Ca3(AsO4)2+3FeS2+C+9.75O2(g)=6CaSO4+1.5Fe2O3+As4O6(g)+CO(g)

[0059] 2Ca3(AsO4)2+3FeS2+C+7O2(g)=6CaO+6SO2(g)+Fe3O4+As4O6(g)+CO2(g)

[0060] 2Ca3(AsO4)2+2FeS2+C+4.5O2(g)=6CaO+4SO2(g)+Fe2O3+As4O6(g)+CO2(g)

[0061] The present invention's method for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste first carbonizes an external carbon source in a mixed material using a medium-temperature pyrolysis furnace 11, outputting the carbonized mixed material. The carbonized mixed material is then pyrolyzed in a high-temperature pyrolysis furnace 12. During this process, arsenic oxide becomes gaseous, carbon, calcium arsenate, and ferrous disulfide react, decomposing most of the calcium arsenate and converting the arsenic in the calcium arsenate into gaseous arsenic oxide. A first arsenic-containing gas and a low-arsenic residue are output from the high-temperature furnace gas outlet and the high-temperature furnace material outlet, respectively. The first arsenic-containing gas can be processed in a condensation arsenic collection chamber 13 to produce a first refined white arsenic. The reaction of carbon, ferrous disulfide, and calcium arsenate can reduce the production of harmful sulfur dioxide, lower the degree of equipment corrosion, and reduce the amount of pyrite used, thereby lowering costs. The method for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste of the present invention can process the arsenic-containing desulfurized gypsum slag to convert it into a low-arsenic residue that is easy to process; can collect the first refined white arsenic to effectively recycle resources; can reduce the generation of harmful gases and reduce equipment corrosion; and can reduce the amount of pyrite used to reduce costs.

[0062] In step S12, the molar ratio of Ca3(AsO4)2:FeS2:C:O2 is 1:1.3-1.7:0.9-1.1:4.5-5.5. The amount of pyrite is appropriate to avoid wasting resources. The external carbon source is excessive, and the excess carbon can reduce arsenic oxide gas to produce harmless elemental arsenic. The high-temperature pyrolysis furnace 12 is a weak oxygen atmosphere to ensure that the oxygen content meets the requirements of the pyrolysis reaction while preventing excess oxygen from reacting with arsenic oxide gas to form solid arsenic oxide, making it impossible to separate the arsenic. Preferably, the molar ratio of Ca3(AsO4)2:FeS2:C:O2 is 1:1.5:1:5.

[0063] In step S11, the external carbon source of the mixed material obtained by the medium-temperature pyrolysis furnace 11 is municipal sludge, lake bottom sludge and river bottom sludge, which can effectively utilize organic waste.

[0064] In step S12, a low-arsenic residue containing arsenite is discharged through the high-temperature furnace material outlet. A small amount of undecomposed calcium arsenate reacts with ferrous disulfide, water, and oxygen, resulting in the arsenic being present in the form of arsenite. Arsenite is a stable mineral that is essentially insoluble in water, making it suitable for subsequent landfill disposal.

[0065] In step S11, the temperature of the medium-temperature pyrolysis furnace 11 is set to 300°C-450°C, which meets the temperature required for carbonization of the external carbon source and does not waste extra energy. In step S12, the temperature of the high-temperature pyrolysis furnace 12 is set to 750°C-950°C, which meets the temperature required for the pyrolysis process and does not waste extra energy.

[0066] The organic solid waste co-processing equipment for arsenic-containing desulfurized gypsum slag also includes a mixer 14, which is provided with a first mixing inlet, a second mixing inlet, a third mixing inlet, and a mixing outlet. The first mixing inlet is used to input an external carbon source; the second mixing inlet is used to input pyrite; the third mixing inlet is used to input arsenic-containing desulfurized gypsum slag; and the mixing outlet is used to output a mixture of arsenic-containing desulfurized gypsum slag, pyrite, and the external carbon source. The method for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste further includes step S14, wherein a mixer 14 obtains an external carbon source, pyrite, and arsenic-containing desulfurized gypsum slag, and inputs the external carbon source into the mixer 14 through a first mixing inlet, inputs pyrite into the mixer 14 through a second mixing inlet, and inputs arsenic-containing desulfurized gypsum slag into the mixer 14 through a third mixing inlet. The mixer 14 mixes the external carbon source, pyrite, and dried arsenic-containing desulfurized gypsum slag, and outputs a mixture containing the arsenic-containing desulfurized gypsum slag, pyrite, and external carbon source through a mixing outlet. Step S14 precedes step S11. Thorough mixing of the external carbon source, pyrite, and arsenic-containing desulfurized gypsum slag facilitates a sufficient pyrolysis reaction in the high-temperature pyrolysis furnace 12.

[0067] The equipment for collaboratively treating arsenic-containing desulfurized gypsum slag from organic solid waste also includes a first drying machine 15, which is provided with a first drying inlet and a first drying material outlet; the first drying inlet is used to input an external carbon source; the first drying material outlet is used to output a semi-dried external carbon source.

[0068] The method for the coordinated treatment of arsenic-containing desulfurized gypsum slag from organic solid waste also includes step S15, wherein a first dryer 15 obtains an external carbon source, inputs the external carbon source into the first dryer 15 through a first drying inlet, dries the external carbon source, and outputs a semi-dried external carbon source through a first dried material outlet. Step S15 precedes step S14. The external carbon source has a moisture content of approximately 60%. The first dryer 15 renders the external carbon source semi-dry, facilitating uniform mixing of the mixed material in step S14.

[0069] The organic solid waste co-processing equipment for arsenic-containing desulfurized gypsum slag further includes a second drying machine 16, which is provided with a second drying inlet and a second dried material outlet. The second drying inlet is connected to the mixed material outlet. The second dried material outlet is used to output the dehydrated mixed material.

[0070] The method for the coordinated treatment of arsenic-containing desulfurized gypsum slag from organic solid waste also includes step S16, wherein a second dryer 16 receives a mixed material, inputs the mixed material into the second dryer 16 through a second drying inlet, dries the mixed material, and outputs the dehydrated mixed material through a second dried material outlet. Step S16 is located after step S14 and before step S11. The semi-dried external carbon source and arsenic-containing desulfurized gypsum slag with a moisture content of 5% in the mixed material can be dehydrated at low temperature, facilitating subsequent rapid carbonization and saving energy.

[0071] Condensation arsenic collection chamber 13 also includes a condensed gas outlet for outputting the second arsenic-containing gas. The organic solid waste collaborative treatment equipment for arsenic-containing desulfurized gypsum slag also includes a bag dust collector 17, which includes a dust collector inlet and a dust collector solids outlet; the dust collector inlet is connected to the condensed gas outlet; the dust collector solids outlet is used to output the second refined white arsenic.

[0072] The method for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste also includes step S17, wherein a second arsenic-containing gas is obtained by a bag filter 17 and fed into the bag filter 17 through the filter inlet. The bag filter 17 processes the second arsenic-containing gas and outputs a second refined white arsenic through the filter solids outlet. Step S17 is located after step S13. The second arsenic-containing gas can be further processed to recover the second refined white arsenic, thereby improving resource recovery.

[0073] The equipment for the coordinated treatment of arsenic-containing desulfurized gypsum slag by organic solid waste also includes a high-temperature filter 18, which is provided with a filter inlet and a filter gas outlet. The filter inlet is connected to the high-temperature furnace gas outlet, and the filter gas outlet is connected to the condenser inlet. The method for the coordinated treatment of arsenic-containing desulfurized gypsum slag by organic solid waste also includes step S18, in which the high-temperature filter 18 receives a first arsenic-containing gas and inputs it into the high-temperature filter 18 through the filter inlet. The high-temperature filter 18 performs high-temperature dust removal on the first arsenic-containing gas and outputs the first arsenic-containing gas, having been filtered of dust, through the filter gas outlet. Step S18 precedes step S13 and follows step S12. The high-temperature filter 18 removes dust, thereby improving the purity of the first refined white arsenic and the second refined white arsenic.

[0074] The working process of the method for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste according to the preferred embodiment of the present invention is as follows:

[0075] The first drying machine 15 obtains an external carbon source and inputs the external carbon source into the first drying machine 15 through a first drying inlet, dries the external carbon source, and outputs a semi-dried external carbon source through a first drying material outlet;

[0076] The mixer 14 obtains an external carbon source, pyrite, and arsenic-containing desulfurization gypsum slag, and inputs the external carbon source into the mixer 14 through a first mixing inlet, inputs pyrite into the mixer 14 through a second mixing inlet, and inputs arsenic-containing desulfurization gypsum slag into the mixer 14 through a third mixing inlet. The mixer 14 mixes the external carbon source, pyrite, and the dried arsenic-containing desulfurization gypsum slag, and outputs a mixture containing arsenic-containing desulfurization gypsum slag, pyrite, and the external carbon source through a mixing outlet.

[0077] The second drying machine 16 obtains the mixed material and inputs the mixed material into the second drying machine 16 through the second drying inlet, dries the mixed material, and outputs the dehydrated mixed material through the second dried material outlet;

[0078] The medium-temperature pyrolysis furnace 11 obtains a mixture containing arsenic-containing desulfurized gypsum slag, pyrite, and an external carbon source, and inputs the mixture into the medium-temperature pyrolysis furnace 11 through the medium-temperature furnace inlet. The medium-temperature pyrolysis furnace 11 heats and carbonizes the external carbon source of the mixture, and outputs the carbonized mixture through the medium-temperature furnace material outlet.

[0079] The high-temperature pyrolysis furnace 12 obtains the carbonized mixed material and inputs it into the high-temperature pyrolysis furnace 12 through the high-temperature furnace inlet. The high-temperature pyrolysis furnace 12 pyrolyzes the carbonized mixed material and outputs the first arsenic-containing gas through the high-temperature furnace gas outlet and outputs the low-arsenic residue through the high-temperature furnace material outlet.

[0080] The high-temperature filter 18 obtains the first arsenic-containing gas and inputs it into the high-temperature filter 18 through the filter inlet. The high-temperature filter 18 performs high-temperature dust removal on the first arsenic-containing gas and outputs the first arsenic-containing gas with the dust removed through the filter gas outlet.

[0081] The condensation arsenic collecting chamber 13 obtains the first arsenic-containing gas, and inputs it into the condensation arsenic collecting chamber 13 through the condensation inlet, and outputs the first refined white arsenic through the condensation solid outlet;

[0082] The bag filter 17 obtains the second arsenic-containing gas and inputs it into the bag filter 17 through the filter inlet. The bag filter 17 processes the second arsenic-containing gas and outputs the second refined white arsenic through the filter solid outlet.

[0083] This completes the working process of the method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste in this preferred embodiment.

[0084] The present invention provides a method for the coordinated treatment of arsenic-containing desulfurized gypsum slag from organic solid waste. First, an external carbon source in a mixed material is carbonized in a medium-temperature pyrolysis furnace, and the carbonized mixed material is output. The carbonized mixed material is then pyrolyzed in a high-temperature pyrolysis furnace. During this process, arsenic oxide is converted into a gaseous state, and carbon, calcium arsenate, and ferrous disulfide react, decomposing most of the calcium arsenate. The arsenic in the calcium arsenate is converted into gaseous arsenic oxide. A first arsenic-containing gas and a low-arsenic residue are output from the high-temperature furnace gas outlet and the high-temperature furnace material outlet, respectively. The first arsenic-containing gas can be processed in a condensation arsenic collection chamber to produce a first refined white arsenic. The reaction of carbon, ferrous disulfide, and calcium arsenate can reduce the production of harmful sulfur dioxide, reduce the degree of equipment corrosion, and reduce the amount of pyrite used, thereby reducing costs. The method for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste of the present invention can process the arsenic-containing desulfurized gypsum slag to convert it into a low-arsenic residue that is easy to process; can collect the first refined white arsenic to effectively recycle resources; can reduce the generation of harmful gases and reduce equipment corrosion; and can reduce the amount of pyrite used to reduce costs.

[0085] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the concept of the technical solution of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for co-processing arsenic-containing desulfurized gypsum slag with organic solid waste, characterized in that: The organic solid waste collaborative treatment of arsenic-containing desulfurized gypsum slag equipment is used for treatment, and the organic solid waste collaborative treatment of arsenic-containing desulfurized gypsum slag equipment includes: A medium-temperature pyrolysis furnace is provided with a medium-temperature furnace inlet and a medium-temperature furnace material outlet; the medium-temperature furnace inlet is used to input a mixed material containing arsenic-containing desulfurized gypsum slag, pyrite and an external carbon source; the medium-temperature furnace material outlet is used to output the carbonized mixed material; A high-temperature pyrolysis furnace is provided with a high-temperature furnace inlet, a high-temperature furnace gas outlet, and a high-temperature furnace material outlet; the high-temperature furnace inlet is connected to the medium-temperature furnace material outlet; the high-temperature furnace gas outlet is used to output a first arsenic-containing gas; the high-temperature furnace material outlet is used to output a low-arsenic residue; and, A condensation arsenic collection chamber is provided with a condensation inlet and a condensed solids outlet; the condensation inlet is connected to the high-temperature furnace gas outlet; the condensed solids outlet is used to output the first refined white arsenic; The method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste comprises: S11, the medium-temperature pyrolysis furnace obtains a mixture containing arsenic-containing desulfurized gypsum slag, pyrite, and an external carbon source, and inputs the mixture into the medium-temperature pyrolysis furnace through the medium-temperature furnace inlet; the medium-temperature pyrolysis furnace heats and carbonizes the external carbon source of the mixture, and outputs the carbonized mixture through the medium-temperature furnace material outlet; S12, the high-temperature pyrolysis furnace obtains a carbonized mixed material and inputs it into the high-temperature pyrolysis furnace through the high-temperature furnace inlet, the high-temperature pyrolysis furnace pyrolyzes the carbonized mixed material, and outputs a first arsenic-containing gas through the high-temperature furnace gas outlet, and outputs a low-arsenic residue through the high-temperature furnace material outlet; and S13, the condensation arsenic collection chamber obtains a first arsenic-containing gas, and inputs it into the condensation arsenic collection chamber through the condensation inlet, and outputs first refined white arsenic through the condensation solid outlet; Wherein, in the step S11, the external carbon source of the mixed material obtained by the medium-temperature pyrolysis furnace is municipal sludge, lake bottom sludge and river bottom sludge; In the step S11, the temperature of the medium-temperature pyrolysis furnace is set to 300°C-450°C; in the step S12, the temperature of the high-temperature pyrolysis furnace is set to 750°C-950°C.

2. The method for collaboratively treating arsenic-containing desulfurized gypsum slag from organic solid waste according to claim 1, characterized in that: In step S12, the molar ratio is Ca3(AsO4)2:FeS2:C:O2=1:1.3~1.7:0.9~1.1:4.5~5.

5.

3. The method for collaboratively treating arsenic-containing desulfurized gypsum slag from organic solid waste according to claim 1, characterized in that: In the step S12, the low-arsenic residue containing calexite is outputted through the material outlet of the high-temperature furnace.

4. The method for collaboratively treating arsenic-containing desulfurized gypsum slag from organic solid waste according to claim 1, characterized in that: The organic solid waste collaborative treatment equipment for arsenic-containing desulfurized gypsum slag also includes a mixer, which is provided with a first mixing inlet, a second mixing inlet, a third mixing inlet and a mixing outlet; the first mixing inlet is used to input an external carbon source; the second mixing inlet is used to input pyrite; the third mixing inlet is used to input arsenic-containing desulfurized gypsum slag; the mixing outlet is used to output a mixture containing arsenic-containing desulfurized gypsum slag, pyrite and an external carbon source; The method for the coordinated treatment of arsenic-containing desulfurization gypsum slag with organic solid waste also includes step S14, the mixer obtains an external carbon source, pyrite and arsenic-containing desulfurization gypsum slag, and inputs the external carbon source into the mixer through the first mixing inlet, inputs pyrite into the mixer through the second mixing inlet, and inputs arsenic-containing desulfurization gypsum slag into the mixer through the third mixing inlet, the mixer mixes the external carbon source, pyrite and dried arsenic-containing desulfurization gypsum slag, and outputs a mixture containing arsenic-containing desulfurization gypsum slag, pyrite and the external carbon source through the mixing outlet; step S14 is located before step S11.

5. The method for collaboratively treating arsenic-containing desulfurized gypsum slag from organic solid waste according to claim 4, characterized in that: The organic solid waste collaborative treatment arsenic-containing desulfurized gypsum slag equipment also includes a first drying machine, which is provided with a first drying inlet and a first dried material outlet; the first drying inlet is used to input an external carbon source; the first dried material outlet is used to output a semi-dried external carbon source; The method for the coordinated treatment of arsenic-containing desulfurized gypsum slag by organic solid waste also includes step S15, the first dryer obtains an external carbon source, and inputs the external carbon source into the first dryer through the first drying inlet, dries the external carbon source, and outputs the semi-dry external carbon source through the first drying material outlet; the step S15 is located before the step S14.

6. The method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste according to claim 5, characterized in that: The organic solid waste collaborative treatment arsenic-containing desulfurized gypsum slag equipment also includes a second drying machine, which is provided with a second drying inlet and a second dried material outlet; the second drying inlet is connected to the mixed material outlet; the second dried material outlet is used to output the dehydrated mixed material; The method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste also includes step S16, the second dryer obtains the mixed material, and inputs the mixed material into the second dryer through the second drying inlet, dries the mixed material, and outputs the dehydrated mixed material through the second drying material outlet; the step S16 is located after the step S14 and before the step S11.

7. The method for collaboratively treating arsenic-containing desulfurized gypsum slag from organic solid waste according to claim 1, characterized in that: The condensation arsenic collection chamber further includes a condensation gas outlet for outputting the second arsenic-containing gas; The organic solid waste collaborative treatment arsenic-containing desulfurized gypsum slag equipment also includes a bag dust collector, which includes a dust collector inlet and a dust collector solid outlet; the dust collector inlet is connected to the condensed gas outlet; the dust collector solid outlet is used to output the second refined white arsenic; The method for the coordinated treatment of arsenic-containing desulfurized gypsum slag with organic solid waste also includes step S17, the bag dust collector obtains a second arsenic-containing gas and inputs it into the bag dust collector through the dust collector inlet, the bag dust collector processes the second arsenic-containing gas and outputs a second refined white arsenic through the dust collector solid outlet; step S17 is located after step S13.

8. The method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste according to claim 7, characterized in that: The organic solid waste collaborative treatment arsenic-containing desulfurized gypsum slag equipment also includes a high-temperature filter, which is provided with a filter inlet and a filter gas outlet; the filter inlet is connected to the high-temperature furnace gas outlet; the filter gas outlet is connected to the condensation inlet; The method for collaboratively treating arsenic-containing desulfurized gypsum slag with organic solid waste also includes step S18, wherein the high-temperature filter obtains a first arsenic-containing gas and inputs the gas into the high-temperature filter through the filter inlet, the high-temperature filter performs high-temperature dust removal on the first arsenic-containing gas, and outputs the first arsenic-containing gas filtered of dust through the filter gas outlet; step S18 is located before step S13 and after step S12.

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