CN117623231A - Production process method for preparing bleaching powder from carbide slag - Google Patents
Production process method for preparing bleaching powder from carbide slag Download PDFInfo
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- CN117623231A CN117623231A CN202311676441.9A CN202311676441A CN117623231A CN 117623231 A CN117623231 A CN 117623231A CN 202311676441 A CN202311676441 A CN 202311676441A CN 117623231 A CN117623231 A CN 117623231A
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- carbide slag
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- 239000002893 slag Substances 0.000 title claims abstract description 91
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000007844 bleaching agent Substances 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 239000002245 particle Substances 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 239000000126 substance Substances 0.000 claims abstract description 19
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000001556 precipitation Methods 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 238000004064 recycling Methods 0.000 claims abstract description 13
- 238000012216 screening Methods 0.000 claims abstract description 11
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000000460 chlorine Substances 0.000 claims abstract description 7
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 7
- 239000000047 product Substances 0.000 claims description 44
- 239000000725 suspension Substances 0.000 claims description 27
- 238000006386 neutralization reaction Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000001035 drying Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 17
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 claims description 16
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 15
- 239000012295 chemical reaction liquid Substances 0.000 claims description 15
- 230000003472 neutralizing effect Effects 0.000 claims description 14
- 239000002244 precipitate Substances 0.000 claims description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000000110 cooling liquid Substances 0.000 claims description 6
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 6
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical group [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 6
- 230000001376 precipitating effect Effects 0.000 claims description 6
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 5
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical group [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 239000000112 cooling gas Substances 0.000 claims description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 13
- 239000002699 waste material Substances 0.000 abstract description 11
- 238000003889 chemical engineering Methods 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 238000007781 pre-processing Methods 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
- 239000005997 Calcium carbide Substances 0.000 description 4
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 4
- 238000000227 grinding Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000005518 chemical engineering design Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
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Abstract
The invention provides a production process method for preparing bleaching powder from carbide slag, which relates to the technical field of chemical engineering and comprises the following steps: and (3) preprocessing carbide slag, namely processing original carbide slag, and obtaining carbide slag particles with uniform particle size through screening equipment. According to the invention, the pretreatment and uniform screening of the carbide slag ensure the homogeneity of raw materials, the final quality of bleaching powder is improved, alkaline substances are added, the components in the carbide slag can be effectively converted, the yield and quality of chlorine are enhanced, the hypochlorous acid generation reaction process is optimized, the stability and safety of the product are further ensured, the fine operation of the precipitation and separation process is performed, the generation of secondary pollutants is reduced, the final bleaching powder is purer, the links of liquid treatment and resource recycling are reduced, the emission of waste is reduced, the use efficiency of the raw materials is improved, and an environment-friendly and economical closed-loop system is formed.
Description
Technical Field
The invention relates to the technical field of chemical engineering, in particular to a production process method for preparing bleaching powder from carbide slag.
Background
Chemical engineering is a subject for researching chemical reaction process and engineering design, and aims to combine chemical reaction with industrial production so as to realize efficient, safe and environment-friendly production targets. The main component of the calcium carbide slag, namely the waste slag after the calcium carbide is hydrolyzed to obtain acetylene gas, is calcium hydroxide, is a common raw material for preparing bleaching powder, and aims to convert harmful substances in the calcium carbide slag into harmless bleaching powder through a series of chemical reaction and physical treatment steps, so that the waste calcium carbide slag is converted into valuable products, and meanwhile, the pollution to the environment is reduced.
At present, when bleaching powder is prepared by using carbide slag, the non-uniformity of raw material treatment often causes the fluctuation of the quality of a final product, and the market competitiveness of the product is affected. Meanwhile, the recycling efficiency of the chlorine is low, so that resources are wasted, and the production cost is increased. Moreover, the lack of effective liquid treatment and resource circulation mechanisms in the whole process flow leads to the problems of low-efficiency utilization of resources and environmental pollution, and does not meet the current environmental protection requirements, and needs to be optimized and improved.
Disclosure of Invention
The present invention is directed to solving the technical problems set forth in the background art.
The invention adopts the following technical scheme: a production process method for preparing bleaching powder from carbide slag comprises the following steps:
s1: pretreating carbide slag, namely treating original carbide slag, and obtaining carbide slag particles with uniform particle size through screening equipment;
s2: preparing carbide slag suspension, mixing carbide slag particles with a proper amount of water to form carbide slag suspension;
s3: adding alkaline substances into the carbide slag suspension to obtain a chlorine gas product and a reaction liquid;
s4: collecting gas products, collecting generated chlorine, cooling the gas, and liquefying the gas to obtain liquid chlorine;
s5: hypochlorous acid generating reaction, namely, reacting liquid chlorine with water again in a reaction kettle to obtain a reaction liquid containing hypochlorous acid or calcium hypochlorite;
s6: precipitating and separating the reaction liquid, adding a precipitant into the reaction liquid containing hypochlorous acid or calcium hypochlorite, and precipitating the generated hypochlorous acid or calcium hypochlorite to obtain a precipitate and a clarified liquid;
s7: drying the precipitate, and drying the precipitate to obtain a dried bleaching powder finished product;
s8: liquid treatment, namely neutralizing and filtering the clarified liquid to obtain a recyclable neutralization product;
s9: and (3) recycling resources, and reusing the obtained recyclable neutralization product in the preparation of the carbide slag suspension to form a recycling closed-loop system.
Preferably, in the step S1, when the original carbide slag is processed, the original carbide slag is sequentially dried, ground and screened, and the carbide slag particles are obtained by adopting hot air circulation drying, ball mill grinding and screening. The method improves the processing quality and efficiency of the raw materials, has positive influence on the quality and production cost control of the final product, and is beneficial to reducing the energy consumption and environmental influence.
Preferably, in the step S2, when the carbide slag particles are mixed with a proper amount of water, a multi-layer stirring paddle type stirrer is adopted, and stirring is carried out at the rotating speed of 50-500 rpm under the room temperature condition until the mixing is complete. Here, the stirring method effectively improves the quality of the suspension, and simultaneously reduces the energy consumption and the production cost, which positively affects both the economy and the environmental friendliness of the whole production process.
Preferably, in the step S3, the alkaline substance is lime or sodium hydroxide, and a metering pump is adopted in the adding process to realize accurate adding. Here, by precisely adding an alkaline substance to the carbide slag suspension, a more excellent reaction product can be obtained, and the reaction efficiency is improved, the energy consumption and the cost are reduced, and the environmental pollution is reduced.
Preferably, in the step S4, the cooling gas is cooled by a tube condenser, the cooling liquid is water, and ethylene glycol is added into the water. The ethylene glycol and water are mixed to form the antifreeze cooling liquid, so that the phenomenon that water is directly solidified in a low-temperature environment can be avoided, and the smooth condensation process is ensured.
Preferably, in the step S5, the material of the reaction kettle is stainless steel, the temperature is controlled at 20-40 ℃, and the pH range is 5-7. Here, smooth production of the reaction solution can be sufficiently ensured.
Preferably, in the step S6, the precipitant is copper sulfate or ferric sulfate, and a centrifuge is used for precipitation separation. Here, the precipitant is copper sulfate or iron sulfate. The process has the advantages of improving purity, facilitating subsequent treatment, reducing waste generation, improving production efficiency and the like, and can improve the purity of the product through precipitation and separation, and meanwhile, the clarified liquid can be conveniently subjected to subsequent treatment. In addition, the precipitation and separation can reduce the generation of waste, which is beneficial to environmental protection. And the adoption of a centrifugal machine for precipitation separation can improve the separation speed and efficiency, thereby improving the efficiency of the whole production process.
Preferably, in the step S7, drying is performed by using an oven or a fluidized bed during the precipitation drying process. The moisture in the precipitate can be effectively removed by drying the precipitate through the oven or the fluidized bed, so that the humidity content of the bleaching powder is reduced, microorganisms and bacteria possibly existing in the bleaching powder can be killed by the drying treatment, and the sanitary safety of the product is improved.
Preferably, in the step S8, when the neutralizing agent is added during the neutralization and filtration treatment of the clarified liquid, the neutralizing agent is added while stirring, and the times of the neutralization and filtration treatment are not less than two times. The neutralization reaction speed and degree can be effectively controlled by adding the neutralizing agent and stirring at the same time, excessive heat and reaction byproducts are avoided, and impurities and insoluble substances in the clarified liquid can be further removed by carrying out neutralization and filtration for multiple times, so that the purity and transparency of the neutralized product are improved.
Preferably, in the step S9, when the recyclable neutralization product is used to prepare the carbide slag suspension, the recyclable neutralization product is directly put into the carbide slag suspension generated in the step S2, and meanwhile, carbide slag particles are added for stirring, so that the solution saturation is ensured. Here, the demand for fresh raw materials can be reduced and the production cost can be reduced by recycling the resources. The chemical substances in the recyclable neutralization product can react with carbide slag particles to form a stable suspension system, so that the stability and quality of the product are improved.
Compared with the prior art, the invention has the advantages and positive effects that,
according to the invention, the pretreatment and uniform screening of the carbide slag ensure the homogeneity of raw materials, the final quality of bleaching powder is improved, alkaline substances are added, the components in the carbide slag can be effectively converted, the yield and quality of chlorine are enhanced, the hypochlorous acid generation reaction process is optimized, the stability and safety of the product are further ensured, the fine operation of the precipitation and separation process is performed, the generation of secondary pollutants is reduced, the final bleaching powder is purer, the links of liquid treatment and resource recycling are reduced, the emission of waste is reduced, the use efficiency of the raw materials is improved, and an environment-friendly and economical closed-loop system is formed.
Drawings
FIG. 1 is a flow chart of a process for preparing bleaching powder from carbide slag.
Detailed Description
In order that the above objects, features and advantages of the invention will be more clearly understood, a further description of the invention will be rendered by reference to the appended drawings and examples. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as described herein, and therefore the present invention is not limited to the specific embodiments of the disclosure that follow.
Unless otherwise indicated, the reagents, methods and apparatus employed in the present invention are those conventionally practiced in the art.
Examples
Referring to fig. 1, the present invention provides a technical solution: a production process method for preparing bleaching powder from carbide slag comprises the following steps:
s1: pretreating carbide slag, namely treating original carbide slag, and obtaining carbide slag particles with uniform particle size through screening equipment;
s2: preparing carbide slag suspension, mixing carbide slag particles with a proper amount of water to form carbide slag suspension;
s3: adding alkaline substances into the carbide slag suspension to obtain a chlorine gas product and a reaction liquid;
s4: collecting gas products, collecting generated chlorine, cooling the gas, and liquefying the gas to obtain liquid chlorine;
s5: hypochlorous acid generating reaction, namely, reacting liquid chlorine with water again in a reaction kettle to obtain a reaction liquid containing hypochlorous acid or calcium hypochlorite;
s6: precipitating and separating the reaction liquid, adding a precipitant into the reaction liquid containing hypochlorous acid or calcium hypochlorite, and precipitating the generated hypochlorous acid or calcium hypochlorite to obtain a precipitate and a clarified liquid;
s7: drying the precipitate, and drying the precipitate to obtain a dried bleaching powder finished product;
s8: liquid treatment, namely neutralizing and filtering the clarified liquid to obtain a recyclable neutralization product;
s9: and (3) recycling resources, and reusing the obtained recyclable neutralization product in the preparation of the carbide slag suspension to form a recycling closed-loop system.
According to the invention, the pretreatment and uniform screening of the carbide slag ensure the homogeneity of raw materials, the final quality of bleaching powder is improved, alkaline substances are added, the components in the carbide slag can be effectively converted, the yield and quality of chlorine are enhanced, the hypochlorous acid generation reaction process is optimized, the stability and safety of the product are further ensured, the fine operation of the precipitation and separation process is performed, the generation of secondary pollutants is reduced, the final bleaching powder is purer, the links of liquid treatment and resource recycling are reduced, the emission of waste is reduced, the use efficiency of the raw materials is improved, and an environment-friendly and economical closed-loop system is formed.
In S1, when the original carbide slag is treated, the original carbide slag is sequentially dried, ground and screened, and is subjected to hot air circulation drying and ball mill grinding, and then the carbide slag particles are obtained through screening, the hot air circulation drying technology effectively removes moisture in the carbide slag, the treatment efficiency of raw materials is improved, chemical reaction barriers possibly occurring in subsequent steps are reduced, the ball mill is adopted for grinding, the uniformity of the carbide slag particles is improved, the specific surface area of the carbide slag particles is increased, and the method is very beneficial to subsequent chemical reactions, and is beneficial to improving the reaction rate and the product yield.
In S2, when the carbide slag particles are mixed with a proper amount of water, a multi-layer stirring paddle type stirrer is adopted, stirring is carried out at the rotation speed of 50-500 revolutions per minute under the condition of room temperature until the mixture is complete, the multi-layer stirring paddle can provide more uniform and efficient stirring effect, the carbide slag particles and the water are ensured to be fully mixed, and the stable suspension is formed, so that the efficiency and the effectiveness of the subsequent processing steps are improved, the stirring process under the condition of room temperature reduces the energy consumption, the chemical stability of raw materials is maintained, and unnecessary chemical reactions caused by high temperature are avoided.
In S3, the alkaline substance is lime or sodium hydroxide, and meanwhile, a metering pump is adopted to realize accurate addition in the adding process, and the generation of a chlorine gas product can be promoted by adding the alkaline substance, so that the reaction rate and the reaction completeness can be improved by adding the alkaline substance, and the yield of chlorine gas is improved. Meanwhile, the accurate addition is realized by adopting the metering pump, so that the waste caused by excessive addition and the influence possibly caused to the environment can be avoided. In addition, the accurate control of the addition amount can also reduce energy consumption and cost and improve production efficiency.
In S4, when cooling gas, the pipe type condenser is adopted for cooling, the cooling liquid is water, meanwhile, glycol is added into the water, and the glycol and the water are mixed for use, so that an anti-freezing cooling liquid can be formed, the phenomenon that the water is directly solidified in a low-temperature environment can be avoided, and the smooth proceeding of the condensation process is ensured.
In S5, the reaction kettle is made of stainless steel, the temperature is controlled to be 20-40 ℃, the pH range is 5-7, and hypochlorous acid solution with higher purity and stability can be obtained by controlling the temperature to be 20-40 ℃ and the pH range to be 5-7. The stainless steel reaction kettle can bear pressure and temperature changes, and ensures the safety and stability of the reaction.
In S6, the precipitant is copper sulfate or ferric sulfate, and a centrifuge is adopted for precipitation separation, and the precipitant is copper sulfate or ferric sulfate. The process has the advantages of improving purity, facilitating subsequent treatment, reducing waste generation, improving production efficiency and the like, and can improve the purity of the product through precipitation and separation, and meanwhile, the clarified liquid can be conveniently subjected to subsequent treatment. In addition, the precipitation and separation can reduce the generation of waste, which is beneficial to environmental protection. And the adoption of a centrifugal machine for precipitation separation can improve the separation speed and efficiency, thereby improving the efficiency of the whole production process.
In S7, in the precipitation drying process, drying is performed by adopting an oven or a fluidized bed, and the moisture in the precipitate can be effectively removed by drying by adopting the oven or the fluidized bed, so that the humidity content of the bleaching powder is reduced. This helps to improve the stability and shelf life of the bleach powder and reduces the likelihood of quality changes and spoilage due to humidity. And secondly, the drying treatment can kill microorganisms and bacteria possibly existing in the bleaching powder, improve the sanitary safety of the product, and improve the fluidity and the solubility of the bleaching powder so that the bleaching powder is easier to dissolve and use.
In S8, when the neutralizing agent is added during neutralizing and filtering treatment, the neutralizing agent is added while stirring, and the times of neutralizing and filtering treatment are not less than twice, so that the speed and the degree of the neutralizing reaction can be effectively controlled, excessive heat and reaction byproducts are avoided, the stability and the selectivity of the neutralizing reaction are maintained, the purity and the quality of a neutralized product are improved, impurities and insoluble matters in the clarified liquid can be further removed through repeated neutralizing and filtering treatment, the purity and the transparency of the neutralized product are improved, and meanwhile, the content of harmful substances remained in the neutralized product can be reduced through repeated treatment, and the sanitary safety of the product is improved.
In S9, when the recyclable neutralization product is utilized to prepare the carbide slag suspension, the recyclable neutralization product is directly put into the carbide slag suspension generated in S2, meanwhile, carbide slag particles are added for stirring, the solution saturation is guaranteed, the demand for fresh raw materials can be reduced through resource recycling, the production cost is reduced, chemical substances in the recyclable neutralization product can react with the carbide slag particles to form a stable suspension system, the stability and quality of the product are improved, the recycling can also reduce the generation of wastes and the pollution to the environment, the sustainable utilization of resources is realized, the concentration and the performance of the carbide slag suspension can be improved through ensuring the solution saturation, and the requirement of specific application is met.
Working principle: in the preparation process, firstly, carbide slag is pretreated, original carbide slag is treated, carbide slag particles with uniform particle size are obtained through screening equipment, then the carbide slag particles are mixed with a proper amount of water to form carbide slag suspension, lime or sodium hydroxide is added into the carbide slag suspension to obtain a chlorine gas product and a reaction liquid, the generated chlorine gas is collected and cooled by a tubular condenser (the cooling liquid is a mixture of water and ethylene glycol), the liquid chlorine gas is liquefied to obtain liquid chlorine, then the liquid chlorine gas is reacted with water again in a stainless steel reaction kettle to obtain a reaction liquid containing hypochlorous acid or calcium hypochlorite, copper sulfate or ferric sulfate is added into the reaction liquid, the generated hypochlorous acid or calcium hypochlorite is precipitated to obtain a precipitate and a clarified liquid, the precipitate is subjected to drying treatment by adopting a centrifuge, a dried bleaching powder product is obtained, and then neutralization and filtration treatment are carried out to obtain a recoverable neutralization product, and finally the obtained neutralization product is reused in the preparation of the carbide slag suspension to form a cyclic closed loop system.
The present invention is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present invention without departing from the technical content of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. The production process method for preparing bleaching powder from carbide slag is characterized by comprising the following steps:
s1: pretreating carbide slag, namely treating original carbide slag, and obtaining carbide slag particles with uniform particle size through screening equipment;
s2: preparing carbide slag suspension, mixing carbide slag particles with a proper amount of water to form carbide slag suspension;
s3: adding alkaline substances into the carbide slag suspension to obtain a chlorine gas product and a reaction liquid;
s4: collecting gas products, collecting generated chlorine, cooling the gas, and liquefying the gas to obtain liquid chlorine;
s5: hypochlorous acid generating reaction, namely, reacting liquid chlorine with water again in a reaction kettle to obtain a reaction liquid containing hypochlorous acid or calcium hypochlorite;
s6: precipitating and separating the reaction liquid, adding a precipitant into the reaction liquid containing hypochlorous acid or calcium hypochlorite, and precipitating the generated hypochlorous acid or calcium hypochlorite to obtain a precipitate and a clarified liquid;
s7: drying the precipitate, and drying the precipitate to obtain a dried bleaching powder finished product;
s8: liquid treatment, namely neutralizing and filtering the clarified liquid to obtain a recyclable neutralization product;
s9: and (3) recycling resources, and reusing the obtained recyclable neutralization product in the preparation of the carbide slag suspension to form a recycling closed-loop system.
2. The process for preparing bleaching powder from carbide slag according to claim 1, wherein the process comprises the following steps: in the step S1, when the original carbide slag is treated, the original carbide slag is sequentially dried, ground and screened, and then is ground by adopting a hot air circulation drying and ball mill, and the carbide slag particles are obtained by screening.
3. The process for preparing bleaching powder from carbide slag according to claim 1, wherein the process comprises the following steps: in the step S2, when the carbide slag particles are mixed with a proper amount of water, a multi-layer stirring paddle type stirrer is adopted, and stirring is carried out at the rotating speed of 50-500 rpm under the condition of room temperature until the mixing is complete.
4. The process for preparing bleaching powder from carbide slag according to claim 1, wherein the process comprises the following steps: in the step S3, the alkaline substance is lime or sodium hydroxide, and simultaneously, a metering pump is adopted in the adding process to realize accurate adding.
5. The process for preparing bleaching powder from carbide slag according to claim 1, wherein the process comprises the following steps: in the step S4, the cooling gas is cooled by a tubular condenser, the cooling liquid is water, and simultaneously, the glycol is added into the water.
6. The process for preparing bleaching powder from carbide slag according to claim 1, wherein the process comprises the following steps: in the step S5, the material of the reaction kettle is stainless steel, the temperature is controlled at 20-40 ℃, and the pH range is 5-7.
7. The process for preparing bleaching powder from carbide slag according to claim 1, wherein the process comprises the following steps: in the step S6, the precipitant is copper sulfate or ferric sulfate, and a centrifugal machine is adopted for precipitation separation.
8. The process for preparing bleaching powder from carbide slag according to claim 1, wherein the process comprises the following steps: in the step S7, in the process of precipitation drying, drying is performed by using an oven or a fluidized bed.
9. The process for preparing bleaching powder from carbide slag according to claim 1, wherein the process comprises the following steps: in the step S8, when the clear solution is subjected to neutralization and filtration treatment, a mode of stirring while adding the neutralizing agent is adopted, and the times of neutralization and filtration treatment are not less than twice.
10. The process for preparing bleaching powder from carbide slag according to claim 1, wherein the process comprises the following steps: in the step S9, when the recyclable neutralization product is utilized to prepare the carbide slag suspension, the recyclable neutralization product is directly put into the carbide slag suspension generated in the step S2, and meanwhile, carbide slag particles are added for stirring, so that the solution saturation is ensured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311676441.9A CN117623231A (en) | 2023-12-07 | 2023-12-07 | Production process method for preparing bleaching powder from carbide slag |
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| CN202311676441.9A CN117623231A (en) | 2023-12-07 | 2023-12-07 | Production process method for preparing bleaching powder from carbide slag |
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| CN117623231A true CN117623231A (en) | 2024-03-01 |
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| CN202311676441.9A Pending CN117623231A (en) | 2023-12-07 | 2023-12-07 | Production process method for preparing bleaching powder from carbide slag |
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