CN113501534B - Method for recycling sodium sulfate waste salt - Google Patents
Method for recycling sodium sulfate waste salt Download PDFInfo
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- CN113501534B CN113501534B CN202110818070.8A CN202110818070A CN113501534B CN 113501534 B CN113501534 B CN 113501534B CN 202110818070 A CN202110818070 A CN 202110818070A CN 113501534 B CN113501534 B CN 113501534B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/16—Purification
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/18—Dehydration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention relates to the field of waste treatment, and discloses a method for recycling sodium sulfate waste salt, which comprises the following steps: the steps of cooperative treatment, dissolution treatment, evaporative crystallization and the like; the invention discloses a method for disposing sodium sulfate waste salt in cooperation with a cement kiln, which comprises the steps of decomposing and gasifying organic matters in the sodium sulfate waste salt by utilizing the heat of the cement kiln, fully burning the organic matters in a decomposing furnace of the cement kiln, performing harmless emission, dissolving, filtering, evaporating and crystallizing the thermally cracked sodium sulfate to obtain an industrial sodium sulfate product; the method has the advantages of less energy consumption, high quality of the recovered sodium sulfate and high recovery rate, and is a green method for recycling the sodium sulfate waste salt.
Description
Technical Field
The invention relates to the field of waste treatment, in particular to a method for recycling sodium sulfate waste salt.
Background
The amount of the industrial waste salt generated in industrial production per year is about 120 ten thousand tons/year, and the total amount of the industrial waste salt which is not treated and piled up in the past is estimated to be more than ten thousand tons, wherein one common salt slag is waste sodium sulfate waste salt slag, the sodium sulfate content is not less than 70% (wt%), and the sodium sulfate waste salt slag contains part of organic matters; the sodium sulfate waste salt slag contains organic matters, toxic and harmful substances, has high moisture content and is easy to harden, so that the sodium sulfate waste salt slag cannot be directly used as industrial raw materials and auxiliary materials, and can escape malodor smell, so that the treatment is difficult.
CN110981059a discloses a sodium sulfate and sodium sulfite dinaphthol wastewater treatment system and a treatment process thereof, the sodium naphthalene sulfonate can be recovered firstly by combining evaporation and cooling processes, then high-concentration filtrate can be discharged out of the system and recycled by refreezing to form sodium sulfate decahydrate crystals, separation of sodium sulfite and sodium sulfate can be realized, and then the sodium sulfate decahydrate crystals are subjected to hot melting, resin adsorption and evaporation, so that pure sodium sulfate can be ensured, and the evaporation efficiency is high.
CN110615452a discloses a method for sectional treatment and recovery of sodium sulfate waste salt slag, which comprises the following steps: grinding and crushing the sodium sulfate waste salt slag to pass through a 35-mesh sieve; (2) Carbonizing crushed sodium sulfate waste salt slag in a first section; (3) Dissolving carbonized product with sufficient water, filtering, and separating to obtain carbonized residue and clear solution; (4) Sending the carbonized residues and the flue gas of the first section to a second section for high-temperature incineration; (5) And (3) evaporating and crystallizing the filtrate to obtain a sodium sulfate product, and recycling condensed water into the step (3). The invention takes the medical intermediate byproduct sodium sulfate waste salt slag as a treatment object, takes the separation of sodium sulfate and organic impurities as an entry point, separates inorganic salt from organic matters before high-temperature treatment by leading a dissolution filtering section to be between a low-temperature section and a high-temperature section, successfully solves the problems that the organic matters are not thoroughly treated under the low-temperature condition, the inorganic salt is melted at high temperature under the high-temperature condition and a furnace body is easy to corrode, and realizes the harmless and recycling of the sodium sulfate waste salt slag.
CN207430120U discloses a high-efficient processing apparatus of salt sodium sulfate, including handling the case, the left side fixed mounting at handling the case top has rather than the inlet pipe of intercommunication, the bottom fixed mounting on handling the case right side has the row material pipe rather than the intercommunication, the top of handling the case is provided with agitator motor, the output shaft on the agitator motor passes through shaft coupling and stirring pivot fixed connection, the equal fixed mounting in both sides of stirring pivot has the stirring pivot of equidistance arrangement, the front of the stirring pivot on right side and the equal fixed mounting in the back of the stirring pivot on left side have the L shape connecting rod of equidistance arrangement. This high-efficient processing apparatus of salt sodium sulfate that waste enables the effect of handling and can reach better, and the efficiency of handling is higher, has effectively improved the production efficiency of enterprise, makes the pollution of sodium sulfate waste water to the environment can reduce to lower, provides bigger guarantee for people's healthy.
The method and the prior art adopt a method of dissolving and crystallizing after high-temperature carbonization, and the substances after organic carbonization have serious influence on the dissolution of sodium sulfate and influence the recovery rate of the sodium sulfate.
Disclosure of Invention
In order to solve the problems, the invention provides a method for recycling sodium sulfate waste salt.
A method for recycling sodium sulfate waste salt comprises the following steps:
step one, co-processing: uniformly mixing 200-260 parts of sodium sulfate waste salt and 0.6-1.2 parts of organic matter cracking auxiliary agent to obtain a mixed material, feeding the mixed material into pyrolysis equipment, wherein the pyrolysis equipment is provided with a heating layer and a material chamber, the heating layer is connected with a cement kiln decomposition system, the heat of a cement kiln is introduced into the pyrolysis equipment to heat the sodium sulfate waste salt mixed material in the material chamber, firstly, the mixed material is treated at a lower temperature for 10-30min, and then, the mixed material is heated to 850-1000 ℃ for 20-60min; the material chamber is in an anaerobic heating state, and the volume ratio of the smoke generated by the organic matters to the air is 0.8: mixing in a proportion of 0.6-1.2, entering a cement kiln decomposing furnace through a pipeline, and entering a cement kiln waste gas system after full combustion;
step two, dissolution treatment: dissolving the treated sodium sulfate waste residue with tap water, wherein the solid-liquid ratio is 1:3.5-6.8, the dissolving temperature is 40-70 ℃, and carrying out solid-liquid separation after dissolving to obtain a salt solution and insoluble matters;
step three, evaporating and crystallizing: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain a recovered anhydrous sodium sulfate product.
The organic matter cracking auxiliary agent is prepared according to the following method:
3.4-6.7 parts of aluminum acrylate, 10-15 parts of alpha, omega-dimercapto polyethylene glycol, 2.5-5.5 parts of allylphenylsulfone, 3-6 parts of sodium methoxide and 100-200 parts of white oil are added, stirred and reacted for 100-180min at the temperature of 50-58 ℃, filtered, dried and transferred to a grinder after completion; then adding 100-150 parts of diatomite, 10-30 parts of active kaolin and 1.2-3.8 parts of rare earth oxide into a grinder, and continuously grinding for 10-30min to obtain the organic matter cracking auxiliary agent.
The organic matter cracking auxiliary agent is prepared by Michael addition reaction of aluminum acrylate, alpha, omega-dimercapto polyethylene glycol, allyl phenyl sulfone and sodium methoxide; the reaction formula is shown as follows:
the rare earth oxide is cerium oxide or lanthanum oxide or rubidium oxide.
The phosphoric acid compound is phosphoric acid or metaphosphoric acid with the mass concentration of 50-85%.
The ethylene glycol is ethylene glycol 1000, ethylene glycol 3000 or ethylene glycol 6000.
The solid content of the slurry is 10% -18%.
The lower temperature is 350-550 ℃.
Calcining the insoluble matters for 4-6 hours in an air atmosphere at 500-650 ℃ to obtain the recycled organic matter cracking auxiliary agent.
The invention discloses a method for recycling sodium sulfate waste salt, which is characterized in that the method is used for processing the sodium sulfate waste salt in cooperation with a cement kiln, organic matters in the sodium sulfate waste salt are decomposed and gasified by using the heat of the cement kiln, then enter a decomposing furnace of the cement kiln for full combustion, are subjected to harmless emission, and then sodium sulfate after thermal cracking is dissolved, filtered, evaporated and crystallized to obtain an industrial sodium sulfate product; the method can recycle the sodium sulfate salt, fully utilize the organic matters contained in the waste salt to burn and generate heat, supply energy for the cement kiln and achieve the aim of fully recycling; the organic matter cracking auxiliary agent added in the waste salt can decompose the organic matter into volatile substances at 350-550 ℃ firstly, take away the organic matter along with the flue gas at high temperature, reduce carbide residues in the waste salt, not influence subsequent dissolving and evaporating crystallization operations, and ensure the recovery rate of the sodium sulfate waste salt; the method fully utilizes the heat generated by the cement kiln to decompose the organic matters in the waste salt, and then the volatile organic matters generated by the decomposed organic matters are mixed with the air along with the flue gas and then enter the cement kiln to fully burn, so that the heat is provided for the cement kiln, and the purpose of green treatment is achieved. The method has the advantages of less energy consumption, high quality of the recovered sodium sulfate and high recovery rate, and is a green method for recycling the sodium sulfate waste salt.
Drawings
Fig. 1 is an electron microscope view of SU8010 of a waste cooking agent sodium sulfate salt in a pulp production process of a certain paper mill.
Sodium sulfate is needle-shaped crystal, and organic matters are mixed in the crystal.
Fig. 2 is a waste salt thermogravimetric analysis of sodium sulfate waste salt of a waste digester in a pulp production process of a certain paper mill.
The waste salt contains a plurality of exothermic peaks, and is judged to contain a plurality of organic matters; exothermic peak average <800 ℃; an endothermic peak occurs at >800 ℃, indicating that the salt begins to melt.
Detailed Description
The invention is further illustrated by the following examples:
according to the embodiment of the invention, the waste cooking agent sodium sulfate waste salt in the pulp production process of a certain paper mill is taken, and the content of sodium sulfate in the waste salt of the raw materials is about 82.83%, the content of organic matters is about 11.08% and the content of water is about 4.82% after analysis; the specific implementation steps of the embodiment are as follows:
example 1
A method for recycling sodium sulfate waste salt comprises the following steps:
step one, co-processing: uniformly mixing 200kg of sodium sulfate waste salt and 0.6kg of organic matter cracking auxiliary agent to obtain a mixed material, and sending the mixed material into pyrolysis equipment, wherein the pyrolysis equipment is provided with a heating layer and a material chamber, the heating layer is connected with a cement kiln decomposition system, heat of a cement kiln is introduced into the pyrolysis equipment to heat the mixed material of the sodium sulfate waste salt in the material chamber, firstly, the mixed material is treated at a lower temperature for 10min, then, the mixed material is heated to 850 ℃, and the reaction time is 20min; the material chamber is in an anaerobic heating state, and the volume ratio of the smoke generated by the organic matters to the air is 0.8: the mixture with the proportion of 0.6 enters a cement kiln decomposing furnace through a pipeline, and enters a cement kiln waste gas system after being fully combusted;
the organic matter cracking auxiliary agent is prepared according to the following method:
3.4kg of aluminum acrylate, 10kg of alpha, omega-dimercapto polyethylene glycol, 2.5kg of allyl benzenesulfone, 3kg of sodium methoxide and 100kg of white oil are added, stirred and reacted for 100min at a temperature of 50 ℃, filtered after completion, dried and transferred to a grinder; then adding 100kg of diatomite, 10kg of active kaolin and 1.2kg of rare earth oxide into a grinder, and continuously grinding for 10min to obtain the organic matter cracking auxiliary agent.
Step two, dissolution treatment: dissolving the treated sodium sulfate waste residue with tap water at a solid-liquid ratio of 1:3.5 and a dissolving temperature of 40 ℃, and carrying out solid-liquid separation after dissolving to obtain a salt solution and insoluble matters;
step three, evaporating and crystallizing: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain a recovered anhydrous sodium sulfate product.
The rare earth oxide is cerium oxide.
The phosphoric acid compound is phosphoric acid with the mass concentration of 50%.
The ethylene glycol is ethylene glycol 1000.
The solid content of the slurry is 10%.
The lower temperature is 350 ℃.
Calcining the insoluble substances for 6 hours in an air atmosphere at 500 ℃ to obtain the recycled organic matter cracking auxiliary agent.
Example 2
A method for recycling sodium sulfate waste salt comprises the following steps:
step one, co-processing: uniformly mixing 230kg of sodium sulfate waste salt and 0.9kg of organic matter cracking auxiliary agent to obtain a mixed material, and sending the mixed material into pyrolysis equipment, wherein the pyrolysis equipment is provided with a heating layer and a material chamber, the heating layer is connected with a cement kiln decomposition system, heat of a cement kiln is introduced into the pyrolysis equipment to heat the mixed material of the sodium sulfate waste salt in the material chamber, firstly, the mixed material is treated at a lower temperature for 20min, then, the temperature is increased to 950 ℃, and the reaction time is 40min; the material chamber is in an anaerobic heating state, and the volume ratio of the smoke generated by the organic matters to the air is 0.8: the mixture with the proportion of 0.9 enters a cement kiln decomposing furnace through a pipeline, and enters a cement kiln waste gas system after being fully combusted;
the organic matter cracking auxiliary agent is prepared according to the following method:
adding 7kg of alpha, omega-dimercapto polyethylene glycol, 4kg of allylbenzenesulfone, 5kg of sodium methoxide and 150kg of white oil into 5kg of aluminum acrylate, stirring at a temperature of 54 ℃ for reaction for 140min, filtering after completion, drying and transferring into a grinder; then adding 125kg of diatomite, 20kg of active kaolin and 2.5kg of rare earth oxide into a grinder, and continuously grinding for 20min to obtain the organic matter cracking auxiliary agent. Step two, dissolution treatment: dissolving the treated sodium sulfate waste residues with tap water, wherein the solid-liquid ratio is 1:5.2, the dissolution temperature is 60 ℃, and carrying out solid-liquid separation after dissolution to obtain a salt solution and insoluble matters;
step three, evaporating and crystallizing: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain a recovered anhydrous sodium sulfate product.
The rare earth oxide is cerium oxide or lanthanum oxide or rubidium oxide.
The phosphoric acid compound is metaphosphoric acid with the mass concentration of 65%.
The ethylene glycol is ethylene glycol 3000.
The solid content of the slurry is 14%.
The lower temperature is 450 ℃.
Calcining the insoluble substances for 5 hours in an air atmosphere at 550 ℃ to obtain the recycled organic matter cracking auxiliary agent.
Example 3
A method for recycling sodium sulfate waste salt comprises the following steps:
step one, co-processing: uniformly mixing 260kg of sodium sulfate waste salt and 1.2kg of organic matter cracking auxiliary agent to obtain a mixed material, and sending the mixed material into pyrolysis equipment, wherein the pyrolysis equipment is provided with a heating layer and a material chamber, the heating layer is connected with a cement kiln decomposition system, heat of a cement kiln is introduced into the pyrolysis equipment to heat the mixed material of the sodium sulfate waste salt in the material chamber, firstly, the mixed material is treated at a lower temperature for 30min, then, the temperature is raised to 1000 ℃, and the reaction time is 60min; the material chamber is in an anaerobic heating state, and the volume ratio of the smoke generated by the organic matters to the air is 0.8:1.2, the mixture enters a cement kiln decomposing furnace through a pipeline, and enters a cement kiln waste gas system after being fully combusted;
the organic matter cracking auxiliary agent is prepared according to the following method:
adding 15kg of alpha, omega-dimercapto polyethylene glycol, 5.5kg of allyl phenyl sulfone, 6kg of sodium methoxide and 200kg of white oil into 6.7kg of aluminum acrylate, stirring and reacting for 180min at the temperature of 58 ℃, filtering after completion, drying and transferring into a grinder; then 150kg of diatomite, 30kg of active kaolin and 3.8kg of rare earth oxide are added into a grinder, and grinding is continued for 30min, so that the organic matter cracking auxiliary agent can be prepared.
Step two, dissolution treatment: dissolving the treated sodium sulfate waste residue with tap water, wherein the solid-liquid ratio is 1:6.8, the dissolution temperature is 70 ℃, and carrying out solid-liquid separation after dissolution to obtain a salt solution and insoluble matters;
step three, evaporating and crystallizing: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain a recovered anhydrous sodium sulfate product.
The rare earth oxide is rubidium oxide.
The phosphoric acid compound is metaphosphoric acid with the mass concentration of 85%.
The ethylene glycol is ethylene glycol 6000.
The solid content of the slurry is 18%.
The lower temperature is 550 ℃.
Calcining the insoluble matters for 4 hours in an air atmosphere at 650 ℃ to obtain the recycled organic matter cracking auxiliary agent.
An STA 449 F3 thermogravimetric analyzer from the company nai was used. The atmosphere is air, the mass of each test sample is about 16mg, the waste salt sample after the cooperative treatment is placed into an alumina crucible for testing during analysis, and the flow rate of carrier gas is 50ml/min. Residual amount of carbide of the waste salt after the weight reduction reaction treatment in the air atmosphere. The recovery rate of sodium sulfate was calculated according to the ratio of the recovery rate of the reagent to the theoretical recovery rate, and the test results are shown in the following table:
recovery of sodium sulfate (%) carbide (%)
Example 1.85.97.0.42
Example 2 87.83 0.31
Example 3 92.21 0.19
Comparative example 1
A method for recycling sodium sulfate waste salt comprises the following steps:
step one, co-processing: 200kg of sodium sulfate waste salt is sent into pyrolysis equipment, the pyrolysis equipment is provided with a heating layer and a material chamber, the heating layer is connected with a cement kiln decomposition system, the heat of a cement kiln is led into the pyrolysis equipment to heat the sodium sulfate waste salt mixed material in the material chamber, firstly, the treatment is carried out for 10min at a lower temperature, then the heating temperature is increased to 850 ℃, and the reaction time is 20min; the material chamber is in an anaerobic heating state, and the volume ratio of the smoke generated by the organic matters to the air is 0.8: the mixture with the proportion of 0.6 enters a cement kiln decomposing furnace through a pipeline, and enters a cement kiln waste gas system after being fully combusted;
step two, dissolution treatment: dissolving the treated sodium sulfate waste residue with tap water at a solid-liquid ratio of 1:3.5 and a dissolving temperature of 40 ℃, and carrying out solid-liquid separation after dissolving to obtain a salt solution and insoluble matters;
step three, evaporating and crystallizing: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain a recovered anhydrous sodium sulfate product.
The lower temperature is 350 ℃.
Comparative example 2
A method for recycling sodium sulfate waste salt comprises the following steps:
step one, co-processing: uniformly mixing 200kg of sodium sulfate waste salt and 0.6kg of organic matter cracking auxiliary agent to obtain a mixed material, and sending the mixed material into pyrolysis equipment, wherein the pyrolysis equipment is provided with a heating layer and a material chamber, the heating layer is connected with a cement kiln decomposition system, heat of a cement kiln is introduced into the pyrolysis equipment to heat the mixed material of the sodium sulfate waste salt in the material chamber, firstly, the mixed material is treated at a lower temperature for 10min, then, the mixed material is heated to 850 ℃, and the reaction time is 20min; the material chamber is in an anaerobic heating state, and the volume ratio of the smoke generated by the organic matters to the air is 0.8: the mixture with the proportion of 0.6 enters a cement kiln decomposing furnace through a pipeline, and enters a cement kiln waste gas system after being fully combusted;
the organic matter cracking auxiliary agent is prepared according to the following method:
3.4kg of aluminum acrylate, 10kg of alpha, omega-dimercapto polyethylene glycol, 3kg of sodium methoxide and 100kg of white oil are added, stirred and reacted for 100min at the temperature of 50 ℃, filtered, dried and transferred to a grinder after completion; then adding 100kg of diatomite, 10kg of active kaolin and 1.2kg of rare earth oxide into a grinder, and continuously grinding for 10min to obtain the organic matter cracking auxiliary agent.
Step two, dissolution treatment: dissolving the treated sodium sulfate waste residue with tap water at a solid-liquid ratio of 1:3.5 and a dissolving temperature of 40 ℃, and carrying out solid-liquid separation after dissolving to obtain a salt solution and insoluble matters;
step three, evaporating and crystallizing: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain a recovered anhydrous sodium sulfate product.
The ethylene glycol is ethylene glycol 1000.
The solid content of the slurry is 10%.
The lower temperature is 350 ℃.
Calcining the insoluble substances for 6 hours in an air atmosphere at 500 ℃ to obtain the recycled organic matter cracking auxiliary agent.
Comparative example 3
A method for recycling sodium sulfate waste salt comprises the following steps:
step one, co-processing: uniformly mixing 200kg of sodium sulfate waste salt and 0.6kg of organic matter cracking auxiliary agent to obtain a mixed material, and sending the mixed material into pyrolysis equipment, wherein the pyrolysis equipment is provided with a heating layer and a material chamber, the heating layer is connected with a cement kiln decomposition system, heat of a cement kiln is introduced into the pyrolysis equipment to heat the mixed material of the sodium sulfate waste salt in the material chamber, firstly, the mixed material is treated at a lower temperature for 10min, then, the mixed material is heated to 850 ℃, and the reaction time is 20min; the material chamber is in an anaerobic heating state, and the volume ratio of the smoke generated by the organic matters to the air is 0.8: the mixture with the proportion of 0.6 enters a cement kiln decomposing furnace through a pipeline, and enters a cement kiln waste gas system after being fully combusted;
the organic matter cracking auxiliary agent is prepared according to the following method:
adding 10kg of alpha, omega-dimercapto polyethylene glycol, 2.5kg of allyl phenyl sulfone, 3kg of sodium methoxide and 100kg of white oil, stirring at a temperature of 50 ℃ for reaction for 100min, filtering after completion, drying and transferring to a grinder; then adding 100kg of diatomite, 10kg of active kaolin and 1.2kg of rare earth oxide into a grinder, and continuously grinding for 10min to obtain the organic matter cracking auxiliary agent.
Step three, evaporating and crystallizing: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain a recovered anhydrous sodium sulfate product.
The rare earth oxide is cerium oxide.
The phosphoric acid compound is phosphoric acid with the mass concentration of 50%.
The ethylene glycol is ethylene glycol 1000.
The solid content of the slurry is 10%.
The lower temperature is 350 ℃.
Calcining the insoluble substances for 6 hours in an air atmosphere at 500 ℃ to obtain the recycled organic matter cracking auxiliary agent.
The test results of the comparative example for treating sodium sulfate waste salt are shown in the following table:
| sodium sulfate recovery (%) | Carbide (%) | |
| Comparative example 1 | 74.71 | 6.31 |
| Comparative example 2 | 79.52 | 2.14 |
| Comparative example 3 | 83.24 | 0.67 |
Claims (6)
1. A method for recycling sodium sulfate waste salt comprises the following steps:
step one, co-processing: uniformly mixing 200-260 parts of sodium sulfate waste salt and 0.6-1.2 parts of organic matter cracking auxiliary agent to obtain a mixed material, feeding the mixed material into pyrolysis equipment, wherein the pyrolysis equipment is provided with a heating layer and a material chamber, the heating layer is connected with a cement kiln decomposition system, the heat of a cement kiln is introduced into the pyrolysis equipment to heat the sodium sulfate waste salt mixed material in the material chamber, firstly, the mixed material is treated at a lower temperature for 10-30min, and then, the mixed material is heated to 850-1000 ℃ for 20-60min; the material chamber is in an anaerobic heating state, and the volume ratio of the smoke generated by the organic matters to the air is 0.8: mixing in a proportion of 0.6-1.2, entering a cement kiln decomposing furnace through a pipeline, and entering a cement kiln waste gas system after full combustion;
step three, evaporating and crystallizing: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain a recovered anhydrous sodium sulfate product;
the organic matter cracking auxiliary agent is prepared by Michael addition reaction of aluminum acrylate, alpha, omega-dimercapto polyethylene glycol, allyl phenyl sulfone and sodium methoxide;
the organic matter cracking auxiliary agent is prepared according to the following method:
3.4-6.7 parts of aluminum acrylate, 10-15 parts of alpha, omega-dimercapto polyethylene glycol, 2.5-5.5 parts of allylphenylsulfone, 3-6 parts of sodium methoxide and 100-200 parts of white oil are added, stirred and reacted for 100-180min at the temperature of 50-58 ℃, filtered, dried and transferred to a grinder after completion; adding 100-150 parts of diatomite, 10-30 parts of active kaolin and 1.2-3.8 parts of rare earth oxide into a grinder, and continuously grinding for 10-30min to obtain the organic matter cracking auxiliary agent;
step two, dissolution treatment: dissolving the treated sodium sulfate waste residue with tap water, wherein the solid-liquid ratio is 1:3.5-6.8, the dissolving temperature is 40-70 ℃, and carrying out solid-liquid separation after dissolving to obtain a salt solution and insoluble matters.
2. The method for recycling sodium sulfate waste salt according to claim 1, which is characterized in that: the rare earth oxide is cerium oxide or lanthanum oxide.
3. The method for recycling sodium sulfate waste salt according to claim 1, which is characterized in that: the phosphoric acid compound is phosphoric acid or metaphosphoric acid with the mass concentration of 50-85%.
4. The method for recycling sodium sulfate waste salt according to claim 1, which is characterized in that: the solid content of the slurry is 10% -18%.
5. The method for recycling sodium sulfate waste salt according to claim 1, which is characterized in that: the lower temperature is 350-550 ℃.
6. The method for recycling sodium sulfate waste salt according to claim 1, which is characterized in that: calcining the insoluble matters for 4-6 hours in an air atmosphere at 500-650 ℃ to obtain the recycled organic matter cracking auxiliary agent.
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