A method for co-disposal of expired medicines in cement kilns

Abstract

The present invention relates to the technical field of expired drug disposal, and more specifically to a method for co-disposing expired drugs in a cement kiln. The method uses a hammer crusher to crush and screen the expired drugs. The undersize material enters a conditioning tank to obtain material (a). The oversize material then enters a circulating shear crusher for cyclic crushing to obtain material (b). Slaked lime powder is added to material (a), and the mixture is fed into a kneader for thorough mixing to obtain material (c). After material (c) and material (b) are mixed in proportion, the mixture is fed into a kiln tail smoke chamber for incineration using a high-angle belt. The flue gas from the kiln tail smoke chamber is passed into a decomposition furnace, and a montmorillonite composite denitrifier is added during the denitration process to perform denitration treatment. The method avoids environmental pollution, effectively removes harmful gases in the flue gas, and has a high environmental protection effect.

Description

Technical Field

[0001] The present invention relates to the technical field of expired medicine treatment, in particular to a method for co-disposing expired medicines in a cement kiln. Background Art

[0002] Expired drugs are those that have not been used within their expiration date and may have potential quality issues. Expired drugs are not only worthless but can also pose numerous risks. Currently, methods for disposing of expired drugs include high-temperature, high-pressure steam sterilization, high-temperature incineration, and chemical disinfection. Regardless of the method used, expired drugs must first be shredded to reduce their volume and prevent their reuse by unauthorized individuals.

[0003] For example, Chinese patent CN201921050169.2 discloses an environmentally friendly expired drug waste shredding device, which belongs to the field of waste shredding devices. An environmentally friendly expired drug waste shredding device comprises a waste shredding device body, a screening box connected to the waste shredding device body is fixedly connected to the upper left end of the waste shredding device body, an upper hopper connected to the screening box is fixedly connected to the left end of the screening box, a screening opening is opened at the lower end of the screening box, a screen plate is slidably connected in the screening opening, and both ends of the screen plate extend outside the screening box, a fine material pipe matching the screening opening is fixedly connected to the lower end of the screening box, and the fine material pipe is connected to the screening box through the screening opening, so that powdered or fine granular drugs in expired drugs can be screened out, and only large particles of expired drugs are shredded, which can effectively improve the working efficiency of the expired drug waste shredding device and effectively prevent the powdered waste drug residue from spreading into the air and causing harm to human body and environment.

[0004] For example, Chinese patent CN202020705545.3 discloses a device for destroying expired drugs, comprising a crushing chamber and a dissolving chamber arranged from top to bottom; a crushing feed channel is provided at the top of the crushing chamber, a pair of horizontal crushing shafts are passed through the crushing chamber, crushing rollers are fixed to the crushing shafts, the outlet of the crushing chamber is connected to a break-up channel, and an air nozzle is provided on the inner side wall of the break-up channel; the dissolving chamber is filled with a solvent, and an inclined screen is provided between the break-up channel and the dissolving chamber; a reflux chamber is provided on one side of the crushing chamber, a reflux feed port is provided at the bottom of the reflux chamber toward the lower end of the screen, a reflux conveying mechanism for conveying the material upward is provided in the reflux chamber, and a reflux channel connected to the crushing feed channel of the crushing chamber is provided at the top of the reflux chamber. This utility model can process agglomerated and flaked drug powders and avoid the problem of agglomerated and flaked drug powders being re-crushed.

[0005] However, the applicant believes that there are currently technical problems such as the lack of suitable classified storage locations for expired drugs, which easily cause environmental pollution and are not conducive to environmental protection; during the recycling process, traditional waste shredding treatment devices are unable to screen them, and regardless of whether the expired drugs need to be shredded, they must enter the waste shredding treatment device, which to a certain extent reduces the working efficiency of the waste shredding treatment device.

[0006] In view of the deficiencies of the prior art, the present invention proposes a method for co-disposal of expired medicines in a cement kiln. Summary of the Invention

[0007] The purpose of the present invention is to provide a method for co-disposing of expired drugs in cement kilns to solve the technical problem of expired drug recovery and treatment. By co-processing expired drugs in cement kilns, the efficiency of expired drug treatment can be effectively improved.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A method for co-disposal of expired medicines in a cement kiln, the operating steps of which are as follows:

[0010] a: Use a hammer crusher to crush the expired drugs, put them into a 5mm drum screen, and the undersize materials enter the conditioning tank to obtain material (a);

[0011] b: The material on the screen then enters the circulating shear crusher and is crushed to obtain material (b);

[0012] c. Adding slaked lime powder to material (a), feeding into a kneader and mixing thoroughly to obtain material (c);

[0013] d: After mixing material (c) and material (b) in proportion, use a high-angle belt to send the mixture into the kiln tail smoke chamber for incineration; pass the flue gas from the kiln tail smoke chamber into the decomposition furnace, and add montmorillonite composite denitrification agent during the denitrification process to carry out denitrification treatment.

[0014] As a further supplement, the particle size after crushing in step a is 40 to 50 mm, and in step b, the particle size is crushed to less than 10 mm.

[0015] As a further supplement, the amount of slaked lime powder added in step c is 30-40% of material (a), and the mixing time of the kneader in step c is 5-10 minutes.

[0016] As a further supplement, in step d, the mixing ratio of material (c) to material (b) is 1:3-5, and the ratio of the flue gas introduction rate to the addition rate of the montmorillonite composite denitrification agent is 1:(1-3).

[0017] As a further supplement, the preparation method of the montmorillonite denitrification agent is:

[0018] By weight, 12 to 25 parts of intercalated modified montmorillonite, 5 to 10 parts of calcium hydroxide, and 70 to 85 parts of propylene-modified titanium dioxide are uniformly mixed in a high-speed mixer and stirred at a temperature of 70 to 80° C. for 30 to 55 minutes to obtain a montmorillonite composite denitrifier.

[0019] As a further supplement, the montmorillonite intercalation modification method is:

[0020] a. Preparation of intercalation modifier: In parts by weight, 10-20 parts of an unsaturated quaternary ammonium salt, 20-30 parts of tris(2-aminoethyl)amine, 100-150 parts of DMF, stirred at 80-90°C for 2 to 5 hours, and the DMF was distilled off to obtain an intercalation modifier;

[0021] b. Montmorillonite intercalation modification: Add 100-120 parts of montmorillonite to 1000-1200 parts of deionized water by weight, stir evenly at room temperature, then add pH adjusting solution to adjust the pH to 7-12, stir and react at 60-90°C for 5-8 hours, finally add 2-5 parts of intercalation modifier and continue to react for 2-5 hours, wash and centrifuge and dry to obtain intercalation modified montmorillonite.

[0022] As a further supplement, the preparation method of the propylene-modified titanium dioxide is:

[0023] According to weight, 100-120 parts of titanium dioxide are added to 1000-1200 parts of deionized water, and then 3-6 parts of acrylsiloxane are added. The mixture is stirred at room temperature for 1-2 hours, filtered, and dried to obtain acryl-modified titanium dioxide.

[0024] As a further supplement, the acrylic siloxane includes: methacryloxypropyltriethoxysilane (CAS No.: 21142-29-0), (acryloxymethyl)dimethylmethoxysilane (CAS No.: 130771-16-3), and methacrylic acid propoxytriacetoxysilane (CAS No.: 51772-85-1).

[0025] As a further supplement, the unsaturated quaternary ammonium salt includes: methacryloyloxyethyltrimethylammonium chloride, dimethyldiallyl ammonium chloride or diallyl-N-carbonylbutoxymethylammonium chloride.

[0026] As a further supplement, the gas after incineration in step d is treated by the kiln tail exhaust gas treatment system to achieve clean emission, and the residue after incineration further enters the cement kiln to be calcined into cement clinker components; the air outlet of the cement kiln tail smoke chamber is connected to the air inlet of the kiln tail preheating system; the material outlet of the cement kiln tail smoke chamber is connected to the cement production line.

[0027] The technical principle of the present invention is mainly:

[0028] 1: Unsaturated quaternary ammonium salt, tris (2-aminoethyl) amine undergoes addition reaction to obtain diamino quaternary ammonium salt; bentonite is intercalated to increase the interlayer spacing of the layered structure;

[0029] 2: Propylene-modified titanium dioxide and diamino quaternary ammonium salt are intercalated into bentonite, and further addition reaction is carried out to obtain montmorillonite denitrification agent.

[0030] Technical effects of the present invention:

[0031] (1) By processing expired drugs, the pollution to the environment is avoided, which has a high environmental protection effect.

[0032] (2) By pre-treating expired drugs, the stability of their placement into cement kilns is improved, thus avoiding safety risks.

[0033] (3) Through special process routes and flue gas treatment methods, harmful gases in flue gas are effectively removed, which has a high environmental protection effect.

[0034] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. DETAILED DESCRIPTION

[0035] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. It is apparent that the described embodiments are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0036] Example 1

[0037] A method for co-disposal of expired medicines in a cement kiln, the operating steps of which are as follows:

[0038] a: Use a hammer crusher to crush the expired drugs, put them into a 5mm drum screen, and the undersize materials enter the conditioning tank to obtain material (a);

[0039] b: The material on the screen then enters the circulating shear crusher and is crushed to obtain material (b);

[0040] c. Adding slaked lime powder to material (a), feeding into a kneader and mixing thoroughly to obtain material (c);

[0041] d: After mixing material (c) and material (b) in proportion, use a high-angle belt to send the mixture into the kiln tail smoke chamber for incineration; pass the flue gas from the kiln tail smoke chamber into the decomposition furnace, and add montmorillonite composite denitrification agent during the denitrification process to carry out denitrification treatment.

[0042] The particle size after crushing in step a is about 45 mm, and in step b, it is crushed to less than 10 mm.

[0043] The amount of slaked lime powder added in step c is 30% of material (a), and the mixing time of the kneader in step c is 5 minutes.

[0044] In the step d, the mixing ratio of material (c) to material (b) is 1:3, and the ratio of the flue gas introduction rate to the addition rate of the montmorillonite composite denitrification agent is 1:1.

[0045] The preparation method of the montmorillonite denitrifier is:

[0046] 12 kg of intercalated modified montmorillonite, 5 kg of calcium hydroxide, and 70 kg of propylene-modified titanium dioxide were mixed evenly in a high-speed mixer and stirred at a temperature of 70° C. for 30 minutes to obtain a montmorillonite composite denitrifier.

[0047] The montmorillonite intercalation modification method is:

[0048] a. Preparation of intercalation modifier: 10kg of unsaturated quaternary ammonium salt, 20kg of tris(2-aminoethyl)amine, 100kgDMF, stirred at 80°C for 2 hours, and DMF was distilled off to obtain an intercalation modifier;

[0049] b. Montmorillonite intercalation modification: 100 kg of montmorillonite was added to 1000 kg of deionized water, stirred evenly at room temperature, and then a pH adjusting solution was added to adjust the pH to 9. The mixture was stirred at 60 ° C for 5 hours, and finally 2 kg of intercalation modifier was added and the reaction was continued for 2 hours. After washing and centrifugal drying, the intercalation-modified montmorillonite was obtained.

[0050] The preparation method of the propylene-modified titanium dioxide is as follows:

[0051] 100 kg of titanium dioxide was added to 1000 kg of deionized water, and then 3 kg of acrylsiloxane was added. The mixture was stirred at room temperature for 1 hour, filtered, and dried to obtain acryl-modified titanium dioxide.

[0052] The acrylsiloxane is methacryloxypropyltriethoxysilane (CAS No.: 21142-29-0).

[0053] The unsaturated quaternary ammonium salt is methacryloyloxyethyl trimethylammonium chloride.

[0054] The gas after incineration in step d is treated by the kiln tail exhaust gas treatment system to achieve clean emission, and the residue after incineration further enters the cement kiln to be calcined into cement clinker components; the air outlet of the cement kiln tail smoke chamber is connected to the air inlet of the kiln tail preheating system; and the material outlet of the cement kiln tail smoke chamber is connected to the cement production line.

[0055] Example 2

[0056] A method for co-disposal of expired medicines in a cement kiln, the operating steps of which are as follows:

[0057] a: Use a hammer crusher to crush the expired drugs, put them into a 5mm drum screen, and the undersize materials enter the conditioning tank to obtain material (a);

[0058] b: The material on the screen then enters the circulating shear crusher and is crushed to obtain material (b);

[0059] c. Adding slaked lime powder to material (a), feeding into a kneader and mixing thoroughly to obtain material (c);

[0060] d: After mixing material (c) and material (b) in proportion, use a high-angle belt to send the mixture into the kiln tail smoke chamber for incineration; pass the flue gas from the kiln tail smoke chamber into the decomposition furnace, and add montmorillonite composite denitrification agent during the denitrification process to carry out denitrification treatment.

[0061] The particle size after crushing in step a is about 45 mm, and in step b, it is crushed to less than 10 mm.

[0062] The amount of slaked lime powder added in step c is 30% of material (a), and the mixing time of the kneader in step c is 10 minutes.

[0063] In the step d, the mixing ratio of material (c) to material (b) is 1:3, and the ratio of the flue gas introduction rate to the addition rate of the montmorillonite composite denitrification agent is 1:2.

[0064] The preparation method of the montmorillonite denitrifier is:

[0065] 16 kg of intercalated modified montmorillonite, 6 kg of calcium hydroxide, and 75 kg of propylene-modified titanium dioxide were mixed evenly in a high-speed mixer and stirred at a temperature of 70° C. for 55 minutes to obtain a montmorillonite composite denitrifier.

[0066] The montmorillonite intercalation modification method is:

[0067] a. Preparation of intercalation modifier: 15kg of unsaturated quaternary ammonium salt, 24kg of tris(2-aminoethyl)amine, 120kgDMF, stirred at 80 ℃ for 5 hours, and DMF was distilled off to obtain an intercalation modifier;

[0068] b. Montmorillonite intercalation modification: 100 kg of montmorillonite was added to 1200 kg of deionized water, stirred evenly at room temperature, and then a pH adjusting solution was added to adjust the pH to 9. The mixture was stirred at 60 ° C for 8 hours, and finally 3 kg of intercalation modifier was added and the reaction was continued for 3 hours. After washing and centrifugal drying, the intercalation-modified montmorillonite was obtained.

[0069] The preparation method of the propylene-modified titanium dioxide is as follows:

[0070] 100 kg of titanium dioxide was added to 1200 kg of deionized water, and then 4 kg of acrylsiloxane was added. The mixture was stirred at room temperature for 2 hours, filtered, and dried to obtain acryl-modified titanium dioxide.

[0071] The acrylsiloxane is (acryloxymethyl)dimethylmethoxysilane.

[0072] The unsaturated quaternary ammonium salt is dimethyldiallylammonium chloride.

[0073] The gas after incineration in step d is treated by the kiln tail exhaust gas treatment system to achieve clean emission, and the residue after incineration further enters the cement kiln to be calcined into cement clinker components; the air outlet of the cement kiln tail smoke chamber is connected to the air inlet of the kiln tail preheating system; and the material outlet of the cement kiln tail smoke chamber is connected to the cement production line.

[0074] Example 3

[0075] A method for co-disposal of expired medicines in a cement kiln, the operating steps of which are as follows:

[0076] a: Use a hammer crusher to crush the expired drugs, put them into a 5mm drum screen, and the undersize materials enter the conditioning tank to obtain material (a);

[0077] b: The material on the screen then enters the circulating shear crusher and is crushed to obtain material (b);

[0078] c. Adding slaked lime powder to material (a), feeding into a kneader and mixing thoroughly to obtain material (c);

[0079] d: After mixing material (c) and material (b) in proportion, use a high-angle belt to send the mixture into the kiln tail smoke chamber for incineration; pass the flue gas from the kiln tail smoke chamber into the decomposition furnace, and add montmorillonite composite denitrification agent during the denitrification process to carry out denitrification treatment.

[0080] The particle size after crushing in step a is about 45 mm, and in step b, it is crushed to less than 10 mm.

[0081] The amount of slaked lime powder added in step c is 40% of material (a), and the mixing time of the kneader in step c is 5 minutes.

[0082] In the step d, the mixing ratio of material (c) to material (b) is 1:4, and the ratio of the flue gas introduction rate to the addition rate of the montmorillonite composite denitrification agent is 1:2.

[0083] The preparation method of the montmorillonite denitrifier is:

[0084] 20 kg of intercalated modified montmorillonite, 8 kg of calcium hydroxide, and 80 kg of propylene-modified titanium dioxide were mixed evenly in a high-speed mixer and stirred at a temperature of 70° C. for 30 minutes to obtain a montmorillonite composite denitrifier.

[0085] The montmorillonite intercalation modification method is:

[0086] a. Preparation of intercalation modifier: 18kg of unsaturated quaternary ammonium salt, 27kg of tris(2-aminoethyl)amine, 140kgDMF, stirred at 90 ° C for 2 hours, and DMF was distilled off to obtain an intercalation modifier;

[0087] b. Montmorillonite intercalation modification: 120 kg of montmorillonite was added to 1000 kg of deionized water, stirred evenly at room temperature, and then a pH adjusting solution was added to adjust the pH to 9. The mixture was stirred at 90 ° C for 5 hours, and finally 4 kg of intercalation modifier was added and the reaction was continued for 4 hours. After washing and centrifugal drying, the intercalation-modified montmorillonite was obtained.

[0088] The preparation method of the propylene-modified titanium dioxide is as follows:

[0089] 120 kg of titanium dioxide was added to 1000 kg of deionized water, and then 5 kg of acrylsiloxane was added. The mixture was stirred at room temperature for 1 hour, filtered, and dried to obtain acryl-modified titanium dioxide.

[0090] The acrylsiloxane is methacrylate propoxytriacetoxysilane (CAS No.: 51772-85-1).

[0091] The unsaturated quaternary ammonium salt is diallyl-N-carbonylbutoxymethylammonium chloride.

[0092] The gas after incineration in step d is treated by the kiln tail exhaust gas treatment system to achieve clean emission, and the residue after incineration further enters the cement kiln to be calcined into cement clinker components; the air outlet of the cement kiln tail smoke chamber is connected to the air inlet of the kiln tail preheating system; and the material outlet of the cement kiln tail smoke chamber is connected to the cement production line.

[0093] Example 4

[0094] A method for co-disposal of expired medicines in a cement kiln, the operating steps of which are as follows:

[0095] a: Use a hammer crusher to crush the expired drugs, put them into a 5mm drum screen, and the undersize materials enter the conditioning tank to obtain material (a);

[0096] b: The material on the screen then enters the circulating shear crusher and is crushed to obtain material (b);

[0097] c. Adding slaked lime powder to material (a), feeding into a kneader and mixing thoroughly to obtain material (c);

[0098] d: After mixing material (c) and material (b) in proportion, use a high-angle belt to send the mixture into the kiln tail smoke chamber for incineration; pass the flue gas from the kiln tail smoke chamber into the decomposition furnace, and add montmorillonite composite denitrification agent during the denitrification process to carry out denitrification treatment.

[0099] The particle size after crushing in step a is about 45 mm, and in step b, it is crushed to less than 10 mm.

[0100] The amount of slaked lime powder added in step c is 40% of material (a), and the mixing time of the kneader in step c is 10 minutes.

[0101] In the step d, the mixing ratio of material (c) to material (b) is 1:5, and the ratio of the flue gas introduction rate to the addition rate of the montmorillonite composite denitrification agent is 1:3.

[0102] The preparation method of the montmorillonite denitrifier is:

[0103] 25 kg of intercalated modified montmorillonite, 10 kg of calcium hydroxide, and 85 kg of propylene-modified titanium dioxide were mixed evenly in a high-speed mixer and stirred at 80° C. for 55 minutes to obtain a montmorillonite composite denitrifier.

[0104] The montmorillonite intercalation modification method is:

[0105] a. Preparation of intercalation modifier: 20kg of unsaturated quaternary ammonium salt, 30kg of tris(2-aminoethyl)amine, 150kgDMF, stirred at 90 ℃ for 5 hours, and DMF was distilled off to obtain an intercalation modifier;

[0106] b. Montmorillonite intercalation modification: 120 kg of montmorillonite was added to 1200 kg of deionized water, stirred evenly at room temperature, and then a pH adjusting solution was added to adjust the pH to 9. The mixture was stirred at 90 ° C for 8 hours, and finally 5 kg of intercalation modifier was added and the reaction was continued for 5 hours. After washing and centrifugal drying, the intercalation-modified montmorillonite was obtained.

[0107] The preparation method of the propylene-modified titanium dioxide is as follows:

[0108] 120 kg of titanium dioxide was added to 1200 kg of deionized water, and then 6 kg of acrylsiloxane was added. The mixture was stirred at room temperature for 2 hours, filtered, and dried to obtain acryl-modified titanium dioxide.

[0109] The acrylsiloxane is methacryloxypropyltriethoxysilane (CAS No.: 21142-29-0).

[0110] The unsaturated quaternary ammonium salt is diallyl-N-carbonylbutoxymethylammonium chloride.

[0111] The gas after incineration in step d is treated by the kiln tail exhaust gas treatment system to achieve clean emission, and the residue after incineration further enters the cement kiln to be calcined into cement clinker components; the air outlet of the cement kiln tail smoke chamber is connected to the air inlet of the kiln tail preheating system; and the material outlet of the cement kiln tail smoke chamber is connected to the cement production line.

[0112] Comparative Example 1

[0113] A method for co-disposal of expired medicines in a cement kiln, the operating steps of which are as follows:

[0114] a: Use a hammer crusher to crush the expired drugs, put them into a 5mm drum screen, and the undersize materials enter the conditioning tank to obtain material (a);

[0115] b: The material on the screen then enters the circulating shear crusher and is crushed to obtain material (b);

[0116] c. Adding slaked lime powder to material (a), feeding into a kneader and mixing thoroughly to obtain material (c);

[0117] d: After mixing material (c) and material (b) in proportion, use a high-angle belt to send the mixture into the kiln tail smoke chamber for incineration; pass the flue gas from the kiln tail smoke chamber into the decomposition furnace, and add montmorillonite composite denitrification agent during the denitrification process to carry out denitrification treatment.

[0118] The particle size after crushing in step a is about 45 mm, and in step b, it is crushed to less than 10 mm.

[0119] The amount of slaked lime powder added in step c is 30% of material (a), and the mixing time of the kneader in step c is 5 minutes.

[0120] In the step d, the mixing ratio of material (c) to material (b) is 1:3, and the ratio of the flue gas introduction rate to the addition rate of the montmorillonite composite denitrification agent is 1:1.

[0121] The preparation method of the montmorillonite denitrifier is:

[0122] 12 kg of intercalated modified montmorillonite and 5 kg of calcium hydroxide were mixed evenly in a high-speed mixer and stirred at a temperature of 70° C. for 30 minutes to obtain a montmorillonite composite denitrifier.

[0123] The montmorillonite intercalation modification method is:

[0124] a. Preparation of intercalation modifier: 10kg of unsaturated quaternary ammonium salt, 20kg of tris(2-aminoethyl)amine, 100kgDMF, stirred at 80°C for 2 hours, and DMF was distilled off to obtain an intercalation modifier;

[0125] b. Montmorillonite intercalation modification: 100 kg of montmorillonite was added to 1000 kg of deionized water, stirred evenly at room temperature, and then a pH adjusting solution was added to adjust the pH to 9. The mixture was stirred at 60 ° C for 5 hours, and finally 2 kg of intercalation modifier was added and the reaction was continued for 2 hours. After washing and centrifugal drying, the intercalation-modified montmorillonite was obtained.

[0126] The unsaturated quaternary ammonium salt is methacryloyloxyethyl trimethylammonium chloride.

[0127] The gas after incineration in step d is treated by the kiln tail exhaust gas treatment system to achieve clean emission, and the residue after incineration further enters the cement kiln to be calcined into cement clinker components; the air outlet of the cement kiln tail smoke chamber is connected to the air inlet of the kiln tail preheating system; and the material outlet of the cement kiln tail smoke chamber is connected to the cement production line.

[0128] Comparative Example 2

[0129] A method for co-disposal of expired medicines in a cement kiln, the operating steps of which are as follows:

[0130] a: Use a hammer crusher to crush the expired drugs, put them into a 5mm drum screen, and the undersize materials enter the conditioning tank to obtain material (a);

[0131] b: The material on the screen then enters the circulating shear crusher and is crushed to obtain material (b);

[0132] c. Adding slaked lime powder to material (a), feeding into a kneader and mixing thoroughly to obtain material (c);

[0133] d: After mixing material (c) and material (b) in proportion, use a high-angle belt to send the mixture into the kiln tail smoke chamber for incineration; pass the flue gas from the kiln tail smoke chamber into the decomposition furnace, and add montmorillonite composite denitrification agent during the denitrification process to carry out denitrification treatment.

[0134] The particle size after crushing in step a is about 45 mm, and in step b, it is crushed to less than 10 mm.

[0135] The amount of slaked lime powder added in step c is 30% of material (a), and the mixing time of the kneader in step c is 5 minutes.

[0136] In the step d, the mixing ratio of material (c) to material (b) is 1:3, and the ratio of the flue gas introduction rate to the addition rate of the montmorillonite composite denitrification agent is 1:1.

[0137] The preparation method of the montmorillonite denitrifier is:

[0138] 12 kg of intercalated modified montmorillonite, 5 kg of calcium hydroxide, and 70 kg of titanium dioxide were mixed evenly in a high-speed mixer and stirred at a temperature of 70° C. for 30 minutes to obtain a montmorillonite composite denitrifier.

[0139] The montmorillonite intercalation modification method is:

[0140] a. Preparation of intercalation modifier: 10kg of unsaturated quaternary ammonium salt, 20kg of tris(2-aminoethyl)amine, 100kgDMF, stirred at 80°C for 2 hours, and DMF was distilled off to obtain an intercalation modifier;

[0141] b. Montmorillonite intercalation modification: 100 kg of montmorillonite was added to 1000 kg of deionized water, stirred evenly at room temperature, and then a pH adjusting solution was added to adjust the pH to 9. The mixture was stirred at 60 ° C for 5 hours, and finally 2 kg of intercalation modifier was added and the reaction was continued for 2 hours. After washing and centrifugal drying, the intercalation-modified montmorillonite was obtained.

[0142] The unsaturated quaternary ammonium salt is methacryloyloxyethyl trimethylammonium chloride.

[0143] The gas after incineration in step d is treated by the kiln tail exhaust gas treatment system to achieve clean emission, and the residue after incineration further enters the cement kiln to be calcined into cement clinker components; the air outlet of the cement kiln tail smoke chamber is connected to the air inlet of the kiln tail preheating system; and the material outlet of the cement kiln tail smoke chamber is connected to the cement production line.

[0144] Comparative Example 3

[0145] A method for co-disposal of expired medicines in a cement kiln, the operating steps of which are as follows:

[0146] a: Use a hammer crusher to crush the expired drugs, put them into a 5mm drum screen, and the undersize materials enter the conditioning tank to obtain material (a);

[0147] b: The material on the screen then enters the circulating shear crusher and is crushed to obtain material (b);

[0148] c. Adding slaked lime powder to material (a), feeding into a kneader and mixing thoroughly to obtain material (c);

[0149] d: After mixing material (c) and material (b) in proportion, use a high-angle belt to send the mixture into the kiln tail smoke chamber for incineration; pass the flue gas from the kiln tail smoke chamber into the decomposition furnace, and add montmorillonite composite denitrification agent during the denitrification process to carry out denitrification treatment.

[0150] The particle size after crushing in step a is about 45 mm, and in step b, it is crushed to less than 10 mm.

[0151] The amount of slaked lime powder added in step c is 30% of material (a), and the mixing time of the kneader in step c is 5 minutes.

[0152] In the step d, the mixing ratio of material (c) to material (b) is 1:3, and the ratio of the flue gas introduction rate to the addition rate of the montmorillonite composite denitrification agent is 1:1.

[0153] The preparation method of the montmorillonite denitrifier is:

[0154] 12 kg of intercalated modified montmorillonite, 5 kg of calcium hydroxide, and 70 kg of propylene-modified titanium dioxide were mixed evenly in a high-speed mixer and stirred at a temperature of 70° C. for 30 minutes to obtain a montmorillonite composite denitrifier.

[0155] The montmorillonite intercalation modification method is:

[0156] 100 kg of montmorillonite was added to 1000 kg of deionized water and stirred at room temperature. Then, a pH adjusting solution was added to adjust the pH to 9. The mixture was stirred and reacted at 60°C for 5 hours. Finally, 2 kg of tris(2-aminoethyl)amine was added and the reaction was continued for 2 hours. After washing and centrifugal drying, intercalated modified montmorillonite was obtained.

[0157] The preparation method of the propylene-modified titanium dioxide is as follows:

[0158] 100 kg of titanium dioxide was added to 1000 kg of deionized water, and then 3 kg of acrylsiloxane was added. The mixture was stirred at room temperature for 1 hour, filtered, and dried to obtain acryl-modified titanium dioxide.

[0159] The acrylsiloxane is methacryloxypropyltriethoxysilane (CAS No.: 21142-29-0).

[0160] The gas after incineration in step d is treated by the kiln tail exhaust gas treatment system to achieve clean emission, and the residue after incineration further enters the cement kiln to be calcined into cement clinker components; the air outlet of the cement kiln tail smoke chamber is connected to the air inlet of the kiln tail preheating system; and the material outlet of the cement kiln tail smoke chamber is connected to the cement production line.

[0161] The flue gas denitrification effects of the above embodiment and the comparative example kiln tail smoke chamber are shown in the following table:

[0162]

[0163]

[0164] Note: NOx includes NO and NO2.

[0165] Denitrification rate: (import NOx-(outlet NO2+outlet NO×46 / 30))÷import NOx.

[0166] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made thereto. Therefore, such modifications and improvements, without departing from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A method for co-disposal of expired drugs in a cement kiln, comprising the following steps: a: Use a hammer crusher to crush the expired drugs, put them into a 5mm drum screen, and the undersize materials enter the conditioning tank to obtain material a; b: The material on the screen then enters the circulating shear crusher and is crushed to obtain material b; c: Add slaked lime powder to material a, feed into a kneader and mix thoroughly to obtain material c; d: After mixing material c and material b in proportion, use a high-angle belt to send the smoke chamber at the end of the kiln to be incinerated; the smoke from the smoke chamber at the end of the kiln is passed into the decomposition furnace, and montmorillonite composite denitrification agent is added during the denitrification process to carry out denitrification treatment; The preparation method of the montmorillonite denitrifier is: By weight, 12 to 25 parts of intercalated modified montmorillonite, 5 to 10 parts of calcium hydroxide, and 70 to 85 parts of propylene-modified titanium dioxide are uniformly mixed in a high-speed mixer and stirred at a temperature of 70 to 80° C. for 30 to 55 minutes to obtain a montmorillonite composite denitrifier.

2. The method for co-disposal of expired pharmaceuticals in a cement kiln according to claim 1, characterized in that: The particle size after crushing in step a is 40 to 50 mm, and in step b, it is crushed to less than 10 mm.

3. The method for co-disposal of expired pharmaceuticals in a cement kiln according to claim 1, characterized in that: The amount of slaked lime powder added in step c is 30-40% of material a, and the mixing time of the kneader in step c is 5-10 minutes.

4. The method for co-disposal of expired pharmaceuticals in a cement kiln according to claim 1, characterized in that: In the step d, the mixing ratio of material c to material b is 1:3-5, and the ratio of the introduction rate of the flue gas to the addition rate of the montmorillonite composite denitrification agent is 1:(1-3).

5. The method for co-disposal of expired pharmaceuticals in a cement kiln according to claim 1, characterized in that: The montmorillonite intercalation modification method is: a. Preparation of intercalation modifier: In parts by weight, 10-20 parts of an unsaturated quaternary ammonium salt, 20-30 parts of tris(2-aminoethyl)amine, 100-150 parts of DMF, stirred at 80-90°C for 2 to 5 hours, and the DMF was distilled off to obtain an intercalation modifier; b. Montmorillonite intercalation modification: Add 100-120 parts of montmorillonite to 1000-1200 parts of deionized water by weight, stir evenly at room temperature, then add pH adjusting solution to adjust the pH to 7-12, stir and react at 60-90°C for 5-8 hours, finally add 2-5 parts of intercalation modifier and continue to react for 2-5 hours, wash and centrifuge and dry to obtain intercalation modified montmorillonite.

6. The method for co-disposal of expired pharmaceuticals in a cement kiln according to claim 1, characterized in that: The preparation method of the propylene-modified titanium dioxide is as follows: According to weight, 100-120 parts of titanium dioxide are added to 1000-1200 parts of deionized water, and then 3-6 parts of acrylsiloxane are added. The mixture is stirred at room temperature for 1-2 hours, filtered, and dried to obtain acryl-modified titanium dioxide.

7. The method for co-disposal of expired pharmaceuticals in a cement kiln according to claim 6, characterized in that: The acrylsiloxane includes: methacryloxypropyltriethoxysilane (CAS No.: 21142-29-0), (acryloxymethyl)dimethylmethoxysilane (CAS No.: 130771-16-3), and methacrylic acid propoxytriacetoxysilane (CAS No.: 51772-85-1).

8. The method for co-disposal of expired pharmaceuticals in a cement kiln according to claim 5, characterized in that: The unsaturated quaternary ammonium salt includes: methacryloyloxyethyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride or diallyl-N-carbonyl butoxymethyl ammonium chloride.

9. The method for co-disposal of expired pharmaceuticals in a cement kiln according to claim 1, characterized in that: The gas after incineration in step d is treated by the kiln tail exhaust gas treatment system to achieve clean emission, and the residue after incineration further enters the cement kiln to be calcined into cement clinker components; the air outlet of the cement kiln tail smoke chamber is connected to the air inlet of the kiln tail preheating system; and the material outlet of the cement kiln tail smoke chamber is connected to the cement production line.

Images