A method for co-disposing white mud in cement kiln

Abstract

This invention relates to the field of white mud recycling, specifically to a method for co-processing white mud in a cement kiln. The invention involves mixing white mud with aluminum ash and iron slag in a certain proportion, then feeding the mixture to a disc granulator for granulation. The granulated pellets are then fed into an external furnace of the cement kiln, laid at the bottom, and incinerated on top of industrial waste. The pellets fired in the external furnace are then fed into a rotary kiln for further high-temperature incineration. This invention effectively treats white mud, avoiding its environmental pollution and saving the limestone raw material required for cement production, thus turning pollutant white mud into a valuable resource. This invention replaces some of the limestone in cement production with white mud, which helps improve the alkali cycle, reduces air pollution, and lowers cement production costs. When using white mud as a substitute for raw materials in cement clinker production, the cement production line operates stably with good results, without affecting normal cement production and improving production efficiency.

Description

Technical Field

[0001] The invention relates to the field of recycling of white mud, in particular to a method for co-disposing white mud in a cement kiln. Background Art

[0002] At present, most pulping and papermaking adopts chemical pulping. This method uses various chemical agents to dissolve most of the lignin in the plant fiber raw materials under specific conditions and disperse it into pulp. At present, papermaking is mainly pulped by caustic soda. No matter what raw materials are used for papermaking, black liquor will be produced. Black liquor contains a large amount of waste alkali and organic matter. At present, environmental protection does not allow it to be discharged into the river. Although black liquor can be treated by alkali recovery method, which can eliminate the pollution of black liquor, it also produces a large amount of strong alkaline waste residue: white mud.

[0003] Chinese Patent CN201810028044.3: Discloses a method for treating papermaking solid waste white mud with a cement rotary kiln, characterized in that part of the limestone in the cement production raw material is replaced with a mixture of white mud and sulfur-containing compounds. The mass proportion of the part of limestone replaced by the mixture of white mud and sulfur-containing compounds accounts for 3%-10% of the total limestone. The mass proportion of sulfur-containing compounds in the mixture of white mud and sulfur-containing compounds is 10%-15%. The invention effectively treats papermaking solid waste white mud, avoids the pollution of white mud to the environment, saves the limestone raw materials required for cement production, and turns the pollutant white mud into treasure.

[0004] Chinese patent CN201910414309.8: discloses a method for preparing a low AKD adsorption rate alkali recovery white mud refined calcium carbonate filler, firstly, the white mud obtained in the alkali recovery section is screened; secondly, the screened white mud is ground; finally, calcium oxide solid and calcium ion chelating agent are added to the ground white mud, and a certain amount of water is added to control the mass concentration of calcium hydroxide after digestion to be 5%-15%, and digestion is 0.5-2h; at a temperature of 20-60°C, carbon dioxide is introduced to control the system pressure of 0-0.2MPa, and stirring is carried out at the same time, the stirring speed is 200-600 rpm, and the white mud system pH value is carbonized to 8-10, and the obtained product is a low AKD adsorption rate alkali recovery white mud refined calcium carbonate filler. The present invention optimizes the calcium hydroxide content contained in the white mud, thereby controlling the content of microparticles of calcium carbonate filler prepared by carbonization refined white mud and reducing its porosity, improving the quality of white mud refined calcium carbonate, and improving its filling application performance.

[0005] Chinese patent CN201610916302.2: It relates to a preparation method for high-strength gypsum generated by one-step method using papermaking white mud, which includes the following steps: 1) taking a certain mass of papermaking white mud and drying it at low temperature to constant weight, placing it in a reaction vessel, adding a certain concentration of dilute sulfuric acid until no bubbles are generated in the solution; continuing to add a slightly excessive amount of dilute sulfuric acid to the solution; 2) taking a certain mass of active agent and adding it; 3) adding a certain amount of medium crystal agent, stirring and heating the reaction solution to a certain temperature, and reacting at a constant temperature for a period of time to obtain a solution containing high-strength gypsum; 4) vacuum boiling water filtering the mixed solution in the reaction system to obtain a filter cake and fix it with ethanol, and drying it in a vacuum drying oven to constant weight to obtain a high-strength gypsum solid. Beneficial effects of the present invention: The one-step method for preparing high-strength gypsum is simple and easy to operate. Using industrial waste papermaking white mud as a reaction raw material, there is no need to treat the raw material in any way, which has the advantage of high economic benefits, and the waste liquid obtained by the reaction can be recycled.

[0006] At present, the main treatment methods for causticized white mud alkali slag from papermaking are incineration and landfill. There are two main problems with the incineration method. First, the cost of setting up an incineration site is high, the equipment for incinerating white mud is expensive, and the energy consumption is very high. Incineration cannot bring profits to the enterprise and increases the burden on the enterprise; second, the incineration of white mud will also produce a large amount of waste gas containing dioxins, which is easy to cause air pollution, that is, one pollution turns into another pollution; the second way to deal with white mud is landfill, which is currently a common method used by papermaking enterprises. Since white mud is composed of harmful substances that are not easy to decompose (degrade) naturally, directly landfilling white mud not only requires a large amount of land, but also easily causes pollution of the landfill site and surrounding water resources and land pollution, which will directly lead to the deterioration of the ecological environment in the area, waste of land resources and damage to water resources.

[0007] In the prior art, dioxin catalysts are new products in the dioxin removal market. According to the characteristics of the catalyst, they are installed and arranged in a high-temperature and high-dust manner, which can maintain the best reaction activity of the catalyst, reduce the investment cost of the dioxin removal system, and also select the synergistic removal of NOx and dioxin systems as needed. Honeycomb catalysts are generally homogeneous catalysts. A mixture of TiO2, V2O5, WO3, etc. is made into catalyst elements of varying lengths through a ceramic extrusion device, and then assembled into standard modules. The manufacturing process of corrugated plate catalysts generally uses TiO2 reinforced with glass fiber as the substrate, and active ingredients such as WO3 and V2O5 are impregnated into the surface of the catalyst to achieve the purpose of improving the catalyst activity and reducing the SO2 oxidation rate. However, the burning of white mud produces a large amount of dioxins. When using the above catalysts, there are disadvantages such as easy deactivation of the catalyst and short service life. Summary of the invention

[0008] Purpose of the Invention

[0009] In order to solve the defects of the prior art, the purpose of the present invention is to provide a method for co-disposing white mud in a cement kiln, which effectively treats the white mud, avoids the pollution of the white mud to the environment, saves the limestone raw materials required for cement production, and turns the polluted white mud into treasure.

[0010] Solution

[0011] To achieve the purpose of the present invention, an embodiment of the present invention provides a method for co-disposing white mud in a cement kiln, and the operation steps are as follows:

[0012] S1: Mix white mud with aluminum ash, iron slag and dioxin remover in a certain proportion;

[0013] S2: After mixing, the mixture is sent to a disc granulator for granulation;

[0014] S3: The finished balls are sent to the external furnace of the cement kiln, laid on the bottom of the furnace, and the industrial waste is burned on the top;

[0015] S4: Then the balls fired in the external furnace are sent to the cement rotary kiln for continued high-temperature incineration.

[0016] A further technical solution is that the mixing ratio of the white mud to aluminum ash and iron slag is 7-10:0.6:0.4.

[0017] A further technical solution is that the powder particle size is 60-80 μm.

[0018] A further technical solution is that the particle size of the disc granulator is controlled within a range of 100-500 mm.

[0019] A further technical solution is that the thickness of the bottom material layer of the external furnace is controlled at 20-70 cm.

[0020] A further technical solution is that the industrial waste is one or more of plastic, rubber or tire.

[0021] A further technical solution is that the incineration temperature of the external furnace is 750-950°C and the time is 24-36h.

[0022] A further technical solution is that the cement kiln controls the incineration temperature to be 1200-1450°C and the time to be 20-45 minutes.

[0023] A further technical solution is that the dioxin remover is added in an amount of 1-5% of the mass percentage concentration of the white mud, and the preparation method is:

[0024] S1: Add 36-48 parts of dimercaptosuccinic acid, 10-20 parts of manganese nitrate, 3-6 parts of cerium nitrate, 3-6 parts of nickel nitrate, 500-800 parts of organic solvent, 4-8 parts of aluminum chloride, and 3-6 parts of triethylamine into a stirring kettle according to the mass ratio, and stir at 30-50° C. for 40-100 minutes;

[0025] S2: Add 0.3-1.7 parts of vinylferrocene, stir at 60-70°C for 120-180 minutes, remove the organic solvent by vacuum distillation, and then place in a constant temperature oven at 200-250°C for 100-150 hours to obtain a dioxin remover.

[0026] A further technical solution is that the organic solvent is one or more combinations of N,N-dimethylformamide, N,N-dimethylacetamide, and N-methylpyrrolidone.

[0027] Reaction mechanism:

[0028] The dimercaptosuccinic acid, manganese nitrate, cerium nitrate and nickel nitrate generate a mercapto organic metal skeleton, which then reacts with vinyl ferrocene to obtain a dioxin remover.

[0029] Technical effect:

[0030] Compared with the prior art, the method for co-disposing white mud in a cement kiln of the present invention has the following significant effects:

[0031] 1. The present invention effectively treats white mud, avoids the pollution of the white mud to the environment, saves the limestone raw materials required for cement production, and turns the pollutant white mud into treasure;

[0032] 2. The present invention replaces part of the limestone in the raw materials for producing cement with white mud, which is beneficial to improving alkali circulation, reducing air pollution, and reducing cement production costs;

[0033] 3. When the present invention uses white mud to replace raw materials to produce cement clinker, the negative pressure of each detection point of the kiln system is normal, the alkali circulation is greatly reduced, the cement production line runs stably, the effect is good, the normal production of cement is not affected, and the production efficiency can be improved;

[0034] 4. Manganese, cerium and nickel ions in manganese nitrate, cerium nitrate and nickel nitrate replace chloride ions in dioxins through redox reactions, forming unstable intermediates and finally generating non-toxic and volatile products. Ferrocene catalytic combustion in dioxin removers is more thorough, and dioxins in cement kiln incineration slag are treated more thoroughly, with a dioxin removal rate of 99.9%, and the dioxin content in tail gas meets emission standards. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise expressly stated, throughout the specification and claims, the term "including" or its variations such as "comprising" or "including" will be understood to include the stated elements or components, without excluding other elements or other components.

[0036] Raw material component analysis:

[0037] 1. White clay

[0038] Sample name Moisture <![CDATA[SiO2]]> <![CDATA[Al2O3]]> <![CDATA[Fe2O3]]> CaO MgO <![CDATA[K2O]]> <![CDATA[Na2O]]> <![CDATA[SO3]]> <![CDATA[TiO2]]> <![CDATA[P2O5]]> <![CDATA[Cl - ]]> White clay % 0.15 32.24 16.20 0.49 37.92 9.71 0.44 0.45 3.06 1.28 0.04 0.073

[0039] 2. Aluminum ash

[0040] Sample name <![CDATA[SiO2]]> <![CDATA[Al2O3]]> <![CDATA[Fe2O3]]> CaO MgO <![CDATA[K2O]]> <![CDATA[Na2O]]> <![CDATA[SO3]]> <![CDATA[TiO2]]> <![CDATA[P2O5]]> <![CDATA[Cl - ]]> Aluminum ash% 6.65 68.34 2.60 1.93 6.42 0.33 3.84 0.57 0.60 0.05 1.14

[0041] 3. Iron slag

[0042] Sample name Moisture <![CDATA[SiO2]]> <![CDATA[Al2O3]]> <![CDATA[Fe2O3]]> CaO MgO <![CDATA[K2O]]> <![CDATA[Na2O]]> <![CDATA[SO3]]> <![CDATA[TiO2]]> <![CDATA[P2O5]]> <![CDATA[Cl - ]]> Iron slag% 0.03 24.72 3.14 52.20 2.49 0.88 0.56 0.45 1.75 0.42 0.07 0.015

[0043] The flue gas was collected according to the “Sampling Bag Method for Volatile Organic Compounds in Waste Gas from Stationary Pollution Sources” (HJ732-2014), and the VOCs in the flue gas were determined according to the “Solid Phase Adsorption-Thermal Desorption / Gas Chromatography-Mass Spectrometry Method for the Determination of Volatile Organic Compounds in Waste Gas from Stationary Pollution Sources” (HJ732-2014).

[0044] The dioxin detection method refers to the technical requirements for dioxin emission monitoring of hazardous waste incineration disposal facilities specified in HJ / T365-2007.

[0045] Example 1

[0046] A method for co-disposing white mud in a cement kiln, the operating steps of which are as follows:

[0047] S1: Mix white mud with aluminum ash, iron slag and dioxin remover in a certain proportion;

[0048] S2: After mixing, the mixture is sent to a disc granulator for granulation;

[0049] S3: The finished balls are sent to the external furnace of the cement kiln, laid on the bottom of the furnace, and the industrial waste is burned on the top;

[0050] S4: Then the balls fired in the external furnace are sent to the cement rotary kiln for continued high-temperature incineration.

[0051] The mixing ratio of the white mud to aluminum ash and iron slag is 7:0.6:0.4.

[0052] The grinding particle size is 60 μm.

[0053] The particle size of the disc granulator is controlled at 100 mm.

[0054] The thickness of the bottom material layer of the external furnace is controlled at 20 cm.

[0055] The industrial waste is plastic.

[0056] The external furnace has an incineration temperature of 750°C and a burning time of 24 hours.

[0057] The cement kiln controls the incineration temperature to be 1200° C. and the time to be 20 minutes.

[0058] The dioxin remover is added in an amount of 1% of the mass percentage concentration of the white mud, and its preparation method is as follows:

[0059] S1: Add 36 kg of dimercaptosuccinic acid, 10 kg of manganese nitrate, 3 kg of cerium nitrate, 3 kg of nickel nitrate, 500 kg of organic solvent, 4 kg of aluminum chloride, and 3 kg of triethylamine into a stirring kettle, and stir at 30°C for 40 min;

[0060] S2: Add 0.3 kg of vinylferrocene, stir at 60°C for 120 min, remove the organic solvent by vacuum distillation, and then place in a constant temperature oven at 200°C for 100 h to obtain a dioxin remover.

[0061] The organic solvent is N,N-dimethylformamide.

[0062] Example 2

[0063] A method for co-disposing white mud in a cement kiln, the operating steps of which are as follows:

[0064] S1: Mix white mud with aluminum ash, iron slag and dioxin remover in a certain proportion;

[0065] S2: After mixing, the mixture is sent to a disc granulator for granulation;

[0066] S3: The finished balls are sent to the external furnace of the cement kiln, laid on the bottom of the furnace, and the industrial waste is burned on the top;

[0067] S4: Then the balls fired in the external furnace are sent to the cement rotary kiln for continued high-temperature incineration.

[0068] The mixing ratio of the white mud to the aluminum ash and the iron slag is 8:0.6:0.4.

[0069] The powder particle size is 70 μm.

[0070] The particle size of the disc granulator is controlled at 200 mm.

[0071] The thickness of the bottom material layer of the external furnace is controlled at 40 cm.

[0072] The industrial waste is rubber.

[0073] The external furnace has an incineration temperature of 800°C and a burning time of 28 hours.

[0074] The cement kiln controls the incineration temperature to be 1250° C. and the time to be 25 minutes.

[0075] The dioxin remover is added in an amount of 2% of the mass percentage concentration of the white mud, and its preparation method is as follows:

[0076] S1: Add 40 kg of dimercaptosuccinic acid, 14 kg of manganese nitrate, 4 kg of cerium nitrate, 4 kg of nickel nitrate, 600 kg of organic solvent, 5 kg of aluminum chloride, and 4 kg of triethylamine into a stirring tank, and stir at 35°C for 60 min;

[0077] S2: Add 0.8 kg of vinylferrocene, stir at 65° C. for 140 min, remove the organic solvent by vacuum distillation, and then place in a constant temperature oven at 220° C. for a preset 110 hours to obtain a dioxin remover.

[0078] The organic solvent is N,N-dimethylacetamide.

[0079] Example 3

[0080] A method for co-disposing white mud in a cement kiln, the operating steps of which are as follows:

[0081] S1: Mix white mud with aluminum ash, iron slag and dioxin remover in a certain proportion;

[0082] S2: After mixing, the mixture is sent to a disc granulator for granulation;

[0083] S3: The finished balls are sent to the external furnace of the cement kiln, laid on the bottom of the furnace, and the industrial waste is burned on the top;

[0084] S4: Then the balls fired in the external furnace are sent to the cement rotary kiln for continued high-temperature incineration.

[0085] The mixing ratio of the white mud to the aluminum ash and the iron slag is 9:0.6:0.4.

[0086] The powder particle size is 70 μm.

[0087] The particle size of the disc granulator is controlled at 400 mm.

[0088] The thickness of the bottom material layer of the external furnace is controlled at 60 cm.

[0089] The industrial waste is rubber.

[0090] The external furnace has an incineration temperature of 900°C and a burning time of 32 hours.

[0091] The cement kiln controls the incineration temperature to be 1400° C. and the time to be 40 minutes.

[0092] The dioxin remover is added in an amount of 4% of the mass percentage concentration of the white mud, and its preparation method is as follows:

[0093] S1: Add 44 kg of dimercaptosuccinic acid, 18 kg of manganese nitrate, 5 kg of cerium nitrate, 5 kg of nickel nitrate, 700 kg of organic solvent, 7 kg of aluminum chloride, and 5 kg of triethylamine into a stirred tank, and stir at 45 °C for 80 min;

[0094] S2: Add 1.4 kg of vinylferrocene, stir at 65° C. for 160 min, remove the organic solvent by vacuum distillation, and then place in a constant temperature oven at 240° C. for 140 h to obtain a dioxin remover.

[0095] The organic solvent is N,N-dimethylacetamide.

[0096] Example 4

[0097] A method for co-disposing white mud in a cement kiln, the operating steps of which are as follows:

[0098] S1: Mix white mud with aluminum ash, iron slag and dioxin remover in a certain proportion;

[0099] S2: After mixing, the mixture is sent to a disc granulator for granulation;

[0100] S3: The finished balls are sent to the external furnace of the cement kiln, laid on the bottom of the furnace, and the industrial waste is burned on the top;

[0101] S4: Then the balls fired in the external furnace are sent to the cement rotary kiln for continued high-temperature incineration.

[0102] The mixing ratio of the white mud to the aluminum ash and the iron slag is 10:0.6:0.4.

[0103] The grinding particle size is 80 μm.

[0104] The particle size of the disc granulator is controlled at 500 mm.

[0105] The thickness of the bottom material layer of the external furnace is controlled at 70 cm.

[0106] The industrial waste is tires.

[0107] The external furnace has an incineration temperature of 950°C and a burning time of 36 hours.

[0108] The cement kiln controls the incineration temperature to be 1450° C. and the time to be 45 minutes.

[0109] The dioxin remover is added in an amount of 5% of the mass percentage concentration of the white mud, and its preparation method is as follows:

[0110] S1: Add 48 kg of dimercaptosuccinic acid, 20 kg of manganese nitrate, 6 kg of cerium nitrate, 6 kg of nickel nitrate, 800 kg of organic solvent, 8 kg of aluminum chloride, and 6 kg of triethylamine into a stirring tank, and stir at 50°C for 100 min;

[0111] S2: Add 1.7 kg of vinylferrocene, stir at 70°C for 180 min, remove the organic solvent by vacuum distillation, and then place in a constant temperature oven at 250°C for 150 h to obtain a dioxin remover.

[0112] The organic solvent is N-methylpyrrolidone.

[0113] Comparative Example 1

[0114] A method for co-disposing white mud in a cement kiln, the operating steps of which are as follows:

[0115] S1: Mix white mud with aluminum ash, iron slag and dioxin remover in a certain proportion;

[0116] S2: After mixing, the mixture is sent to a disc granulator for granulation;

[0117] S3: The finished balls are sent to the external furnace of the cement kiln, laid on the bottom of the furnace, and the industrial waste is burned on the top;

[0118] S4: Then the balls fired in the external furnace are sent to the cement rotary kiln for continued high-temperature incineration.

[0119] The mixing ratio of the white mud to aluminum ash and iron slag is 7:0.6:0.4.

[0120] The grinding particle size is 60 μm.

[0121] The particle size of the disc granulator is controlled at 100 mm.

[0122] The thickness of the bottom material layer of the external furnace is controlled at 20 cm.

[0123] The industrial waste is plastic.

[0124] The external furnace has an incineration temperature of 750°C and a burning time of 24 hours.

[0125] The cement kiln controls the incineration temperature to be 1200° C. and the time to be 20 minutes.

[0126] The dioxin remover is added in an amount of 1% of the mass percentage concentration of the white mud, and its preparation method is as follows:

[0127] S1: Add 36 kg of dimercaptosuccinic acid, 3 kg of cerium nitrate, 3 kg of nickel nitrate, 500 kg of organic solvent, 4 kg of aluminum chloride, and 3 kg of triethylamine into a stirring kettle, and stir at 30°C for 40 min;

[0128] S2: Add 0.3 kg of vinylferrocene, stir at 60°C for 120 min, remove the organic solvent by vacuum distillation, and then place in a constant temperature oven at 200°C for 100 h to obtain a dioxin remover.

[0129] The organic solvent is N,N-dimethylformamide.

[0130] Comparative Example 2

[0131] A method for co-disposing white mud in a cement kiln, the operating steps of which are as follows:

[0132] S1: Mix white mud with aluminum ash, iron slag and dioxin remover in a certain proportion;

[0133] S2: After mixing, the mixture is sent to a disc granulator for granulation;

[0134] S3: The finished balls are sent to the external furnace of the cement kiln, laid on the bottom of the furnace, and the industrial waste is burned on the top;

[0135] S4: Then the balls fired in the external furnace are sent to the cement rotary kiln for continued high-temperature incineration.

[0136] The mixing ratio of the white mud to aluminum ash and iron slag is 7:0.6:0.4.

[0137] The grinding particle size is 60 μm.

[0138] The particle size of the disc granulator is controlled at 100 mm.

[0139] The thickness of the bottom material layer of the external furnace is controlled at 20 cm.

[0140] The industrial waste is plastic.

[0141] The external furnace has an incineration temperature of 750°C and a burning time of 24 hours.

[0142] The cement kiln controls the incineration temperature to be 1200° C. and the time to be 20 minutes.

[0143] The dioxin remover is added in an amount of 1% of the mass percentage concentration of the white mud, and its preparation method is as follows:

[0144] S1: Add 36 kg of dimercaptosuccinic acid, 10 kg of manganese nitrate, 3 kg of nickel nitrate, 500 kg of organic solvent, 4 kg of aluminum chloride, and 3 kg of triethylamine into a stirring kettle and stir at 30°C for 40 min;

[0145] S2: Add 0.3 kg of vinylferrocene, stir at 60°C for 120 min, remove the organic solvent by vacuum distillation, and then place in a constant temperature oven at 200°C for 100 h to obtain a dioxin remover.

[0146] The organic solvent is N,N-dimethylformamide.

[0147] Comparative Example 3

[0148] A method for co-disposing white mud in a cement kiln, the operating steps of which are as follows:

[0149] S1: Mix white mud with aluminum ash, iron slag and dioxin remover in a certain proportion;

[0150] S2: After mixing, the mixture is sent to a disc granulator for granulation;

[0151] S3: The finished balls are sent to the external furnace of the cement kiln, laid on the bottom of the furnace, and the industrial waste is burned on the top;

[0152] S4: Then the balls fired in the external furnace are sent to the cement rotary kiln for continued high-temperature incineration.

[0153] The mixing ratio of the white mud to aluminum ash and iron slag is 7:0.6:0.4.

[0154] The grinding particle size is 60 μm.

[0155] The particle size of the disc granulator is controlled at 100 mm.

[0156] The thickness of the bottom material layer of the external furnace is controlled at 20 cm.

[0157] The industrial waste is plastic.

[0158] The external furnace has an incineration temperature of 750°C and a burning time of 24 hours.

[0159] The cement kiln controls the incineration temperature to be 1200° C. and the time to be 20 minutes.

[0160] The dioxin remover is added in an amount of 1% of the mass percentage concentration of the white mud, and its preparation method is as follows:

[0161] S1: Add 36 kg of dimercaptosuccinic acid, 10 kg of manganese nitrate, 3 kg of cerium nitrate, 500 kg of organic solvent, 4 kg of aluminum chloride, and 3 kg of triethylamine into a stirring kettle, and stir at 30°C for 40 min;

[0162] S2: Add 0.3 kg of vinylferrocene, stir at 60°C for 120 min, remove the organic solvent by vacuum distillation, and then place in a constant temperature oven at 200°C for 100 h to obtain a dioxin remover.

[0163] The organic solvent is N,N-dimethylformamide.

[0164] The above examples and comparative examples were tested and analyzed, and the results are shown in the following table:

[0165] Incineration rate / % <![CDATA[VOCs content in flue gas / mg / m 3 > Dioxin removal rate / % Example 1 99.93 7.1 99.83 Example 2 99.95 6.6 99.89 Example 3 99.99 5.3 99.95 Example 4 99.98 5.9 99.93 Comparative Example 1 88.57 20.7 88.69 Comparative Example 2 93.12 15.1 93.17 Comparative Example 3 94.97 13.6 95.32

[0166] Through the data analysis of the above examples and comparative examples, the dioxin removal agent prepared by the present invention is added, and the dioxin in the incineration slag in the cement kiln is treated more thoroughly, the dioxin removal rate is as high as 99.95%, and the dioxin content in the tail gas meets the emission standards.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for co-disposing white mud in a cement kiln, the operating steps of which are: S1: Mix white mud with aluminum ash, iron slag and dioxin remover in a certain proportion; S2: After mixing, the mixture is sent to a disc granulator for granulation; S3: The finished balls are sent to the external furnace of the cement kiln, laid on the bottom of the furnace, and the industrial waste is burned on the top; S4: Then the balls fired in the external furnace are sent to the cement rotary kiln for continued high-temperature incineration; The mixing ratio of the white mud to aluminum ash and iron slag is 7-10:0.6:0.4; The dioxin remover is added in an amount of 1-5% of the mass percentage concentration of the white mud, and its preparation method is as follows: H1: Add 36-48 parts of dimercaptosuccinic acid, 10-20 parts of manganese nitrate, 3-6 parts of cerium nitrate, 3-6 parts of nickel nitrate, 500-800 parts of organic solvent, 4-8 parts of aluminum chloride, and 3-6 parts of triethylamine into a stirring kettle, and stir at 30-50°C for 40-100 minutes; H2: Add 0.3-1.7 parts of vinylferrocene according to the mass fraction, stir at 60-70℃ for 120-180min, remove the organic solvent by vacuum distillation, and then place in a constant temperature oven at 200-250℃ for 100-150h to obtain a dioxin remover.

2. The method for co-processing white mud in a cement kiln according to claim 1, Features: The particle size of the disc granulator is controlled at 100-500 mm.

3. The method for co-disposing white mud in cement kiln according to claim 1, Features: The thickness of the bottom material layer of the external furnace is controlled at 20-70cm.

4. The method for co-disposal of white mud in a cement kiln according to claim 1, Features: The industrial waste is one or more of plastic, rubber or tire.

5. The method for co-disposal of white mud in cement kiln according to claim 1, Features: The incineration temperature of the external furnace is 750-950℃ and the time is 24-36h.

6. The method for co-processing white mud in a cement kiln according to claim 1, Features: The cement rotary kiln controls the incineration temperature to 1200-1450℃ and the time to 20-45min.

7. The method for co-disposal of white mud in a cement kiln according to claim 1, Features: The organic solvent is one or more combinations of N,N-dimethylformamide, N,N-dimethylacetamide and N-methylpyrrolidone.