阅读说明：本技术 一种硫酸钠废盐资源化利用的方法 (Method for resource utilization of sodium sulfate waste salt ) 是由 章小华 李春萍 唐柯 赵正斌 章光华 于 2021-07-20 设计创作，主要内容包括：本发明涉及废物处理领域,本发明公开了一种硫酸钠废盐资源化利用的方法,包括：协同处置,溶解处理和蒸发结晶等步骤；本发明公开了一种与水泥窑协同处置硫酸钠废盐的方法,利用水泥窑的热量,在将硫酸钠废盐中的有机物分解气化后进入水泥窑的分解炉中充分燃烧后无害化排放,然后将热裂解后的硫酸钠经过溶解,过滤,蒸发结晶后得到工业级硫酸钠产品；本发明的方法能源消耗少,回收的硫酸钠质量高,回收率高,是一种绿色的硫酸钠废盐资源化利用方法。(The invention relates to the field of waste treatment, and discloses a method for resource utilization of sodium sulfate waste salt, which comprises the following steps: synergistic treatment, dissolution treatment, evaporative crystallization and other steps; the invention discloses a method for disposing sodium sulfate waste salt in cooperation with a cement kiln, which utilizes the heat of the cement kiln, decomposes and gasifies organic matters in the sodium sulfate waste salt, then enters a decomposing furnace of the cement kiln for full combustion and then is discharged harmlessly, and then the thermally cracked sodium sulfate is dissolved, filtered, evaporated and crystallized to obtain an industrial grade sodium sulfate product; the method has the advantages of low energy consumption, high quality of the recovered sodium sulfate and high recovery rate, and is a green method for recycling the waste sodium sulfate.)

1. A method for resource utilization of waste sodium sulfate salt comprises the following steps:

step one, cooperative treatment: uniformly mixing 200-260 parts of sodium sulfate waste salt with 0.6-1.2 parts of organic matter cracking auxiliary agent to obtain a mixed material, 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, introducing the heat of a cement kiln into the pyrolysis equipment to heat the sodium sulfate waste salt mixed material in the material chamber, firstly treating the mixed material at a lower temperature for 10-30min, then heating the mixed material to 850-1000 ℃, and reacting for 20-60 min; the material chamber be in anaerobic heating state, the flue gas and the air that the organic matter produced according to the volume ratio 0.8: mixing in the proportion of 0.6-1.2, feeding into a cement kiln decomposing furnace through a pipeline, fully burning, and feeding into a cement kiln waste gas system;

step three, evaporation and crystallization: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain a recovered anhydrous sodium sulfate product;

the organic cracking aid is prepared by carrying out Michael addition reaction on aluminum acrylate, alpha, omega-dimercaptopolyethylene glycol, allyl phenylsulfone and sodium methoxide.

2. The method for resource utilization of waste sodium sulfate salt as claimed in claim 1, which is characterized in that: the organic cracking aid is prepared by the following method:

adding 3.4-6.7 parts of aluminum acrylate into 10-15 parts of alpha, omega-dimercaptopolyethylene glycol, 2.5-5.5 parts of allyl phenylsulfone, 3-6 parts of sodium methoxide and 200 parts of white oil, stirring and reacting at the temperature of 50-58 ℃ for 100-180min, filtering, drying and transferring to a grinding machine; adding 100-150 parts of diatomite, 10-30 parts of active kaolin and 1.2-3.8 parts of rare earth oxide into a grinding machine, and continuously grinding for 10-30min to obtain the organic cracking aid;

step two, dissolving treatment: dissolving the treated sodium sulfate waste residue with tap water at a solid-liquid ratio of 1:3.5-6.8 and a dissolving temperature of 40-70 ℃, and then carrying out solid-liquid separation to obtain a salt solution and insoluble substances.

3. The method for resource utilization of waste sodium sulfate salt as claimed in claim 1, which is characterized in that: the rare earth oxide is cerium oxide or lanthanum oxide or rubidium oxide.

4. The method for resource utilization of waste sodium sulfate salt as claimed in claim 1, which is characterized in that: the phosphoric acid compound is phosphoric acid or metaphosphoric acid with the mass concentration of 50-85%.

5. The method for resource utilization of waste sodium sulfate salt as claimed in claim 1, which is characterized in that: the glycol is glycol 1000, glycol 3000 or glycol 6000.

6. The method for resource utilization of waste sodium sulfate salt as claimed in claim 1, which is characterized in that: the solid content of the slurry is 10-18%.

7. The method for resource utilization of waste sodium sulfate salt as claimed in claim 1, which is characterized in that: the lower temperature is 350-550 ℃.

8. The method for resource utilization of waste sodium sulfate salt as claimed in claim 1, which is characterized in that: the insoluble substances are calcined for 4-6h in the air atmosphere of 500-650 ℃ to obtain the recovered organic cracking aid.

Technical Field

The invention relates to the field of waste treatment, in particular to a method for resource utilization of sodium sulfate waste salt.

Background

The quantity of industrial waste miscellaneous salt generated in industrial production every year is about 120 ten thousand tons/year, and the total quantity of the industrial waste miscellaneous salt which is not treated and stockpiled in China is estimated to be more than ten million tons, wherein one common salt residue is waste sodium sulfate waste salt residue, the content of sodium sulfate is not less than 70 percent (wt percent), and the sodium sulfate waste salt residue contains partial organic matters; the waste sodium sulfate salt slag contains organic matters, toxic and harmful substances, has high water content and is easy to harden, so that the waste sodium sulfate salt slag cannot be directly used as industrial raw materials and auxiliary materials, and has the disadvantages of odorous odor dissipation and difficult disposal.

CN110981059A discloses a waste water treatment system containing sodium sulfate and sodium sulfite and a treatment process thereof, the waste water treatment system containing sodium sulfate and sodium sulfite and the treatment process thereof firstly can recycle sodium naphthalene sulfonate through the combination of evaporation and cooling processes, then filtrate with high concentration can be discharged out of the system and recycled while sodium sulfate decahydrate crystals are formed through re-freezing, the 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 obtained, and the evaporation efficiency is high.

CN110615452A discloses a method for treating and recycling sodium sulfate waste salt slag in a sectional manner, which comprises the following steps: (1) grinding and crushing the sodium sulfate waste salt slag until the sodium sulfate waste salt slag passes through a 35-mesh sieve; (2) carbonizing the crushed sodium sulfate waste salt slag in a first section; (3) dissolving the carbonized product with sufficient water, filtering, and separating to obtain carbonized residue and clear solution; (4) feeding the carbonized residues and the flue gas of the first section into a second section for high-temperature incineration; (5) and (4) evaporating and crystallizing the filtrate to obtain a sodium sulfate product, and recycling the condensed water to the step (3). The method takes the pharmaceutical intermediate byproduct sodium sulfate waste salt slag as a treatment object, takes the separation of sodium sulfate and organic impurities as an entry point, and separates inorganic salt from organic matters before high-temperature treatment by advancing a dissolving and filtering section to a position between a low-temperature section and a high-temperature section, thereby successfully solving 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 realizing the harmlessness and the recycling of the sodium sulfate waste salt slag.

CN207430120U discloses waste salt sodium sulfate high-efficiency processing device, including handling the case, the left side fixed mounting who handles the roof portion has the inlet pipe rather than the intercommunication, the bottom fixed mounting who handles 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 last output shaft of agitator motor passes through shaft coupling and stirring pivot fixed connection, the equal fixed mounting in both sides of stirring pivot has the stirring fulcrum shaft that the equidistance was arranged, the equal fixed mounting in the front of the stirring fulcrum shaft on right side and the back of left stirring fulcrum shaft has the L shape connecting rod that the equidistance was arranged. This waste salt sodium sulfate high efficiency processing device makes the effect of handling can reach better, and the efficiency of processing 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 above method and the prior art both adopt a method of dissolving and crystallizing after high-temperature carbonization, and substances obtained after organic carbonization have a very serious influence on the dissolution of sodium sulfate, thereby influencing the recovery rate of sodium sulfate.

Disclosure of Invention

In order to solve the problems, the invention provides a method for resource utilization of waste sodium sulfate salt.

A method for resource utilization of waste sodium sulfate salt comprises the following steps:

step one, cooperative treatment: uniformly mixing 200-260 parts of sodium sulfate waste salt with 0.6-1.2 parts of organic matter cracking auxiliary agent to obtain a mixed material, 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, introducing the heat of a cement kiln into the pyrolysis equipment to heat the sodium sulfate waste salt mixed material in the material chamber, firstly treating the mixed material at a lower temperature for 10-30min, then heating the mixed material to 850-1000 ℃, and reacting for 20-60 min; the material chamber be in anaerobic heating state, the flue gas and the air that the organic matter produced according to the volume ratio 0.8: mixing in the proportion of 0.6-1.2, feeding into a cement kiln decomposing furnace through a pipeline, fully burning, and feeding into a cement kiln waste gas system;

step two, dissolving treatment: dissolving the treated sodium sulfate waste residue with tap water at a solid-liquid ratio of 1:3.5-6.8 and a dissolving temperature of 40-70 ℃, and then carrying out solid-liquid separation to obtain a salt solution and insoluble substances;

step three, evaporation and crystallization: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain the recovered anhydrous sodium sulfate product.

The organic cracking aid is prepared by the following method:

adding 3.4-6.7 parts of aluminum acrylate into 10-15 parts of alpha, omega-dimercaptopolyethylene glycol, 2.5-5.5 parts of allyl phenylsulfone, 3-6 parts of sodium methoxide and 200 parts of white oil, stirring and reacting at the temperature of 50-58 ℃ for 100-180min, filtering, drying and transferring to a grinding machine; then 100-150 parts of diatomite, 10-30 parts of active kaolin and 1.2-3.8 parts of rare earth oxide are added into a grinding machine, and the grinding is continued for 10-30min, thus obtaining the organic cracking aid.

The organic cracking aid is prepared by carrying out Michael addition reaction on aluminum acrylate, alpha, omega-dimercaptopolyethylene glycol, allyl phenylsulfone 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 glycol is glycol 1000, glycol 3000 or glycol 6000.

The solid content of the slurry is 10-18%.

The lower temperature is 350-550 ℃.

The insoluble substances are calcined for 4-6h in the air atmosphere of 500-650 ℃ to obtain the recovered organic cracking aid.

The invention discloses a method for recycling sodium sulfate waste salt, which discloses a method for treating the sodium sulfate waste salt in cooperation with a cement kiln, wherein the heat of the cement kiln is utilized, organic matters in the sodium sulfate waste salt are decomposed and gasified, then enter a decomposing furnace of the cement kiln for full combustion and then are discharged harmlessly, and then the thermally cracked sodium sulfate is dissolved, filtered, evaporated and crystallized to obtain an industrial-grade sodium sulfate product; the method can recycle the sodium sulfate body, can also fully utilize organic matters contained in the waste salt to generate heat by combustion, supplies energy to the cement kiln, and achieves the purpose of full resource utilization; according to the invention, the organic matter cracking auxiliary agent added into the waste salt can firstly decompose the organic matter into volatile substances at the temperature of 350-; the method of the invention fully utilizes the heat produced 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 flue gas and the air and then enter the cement kiln for full combustion, thereby providing heat for the cement kiln and achieving the purpose of green treatment. The method has the advantages of low energy consumption, high quality of the recovered sodium sulfate and high recovery rate, and is a green method for recycling the waste sodium sulfate.

Drawings

FIG. 1 is an electron microscope image of SU8010 of waste salt of waste cooking agent sodium sulfate in pulp production process of certain paper mill.

Sodium sulfate is a needle-shaped crystal, and organic matters are included in the crystal.

FIG. 2 is a thermogravimetric analysis of waste salt from waste cooking agent sodium sulfate waste salt in pulp production process of certain paper mill.

The waste salt contains a plurality of exothermic peaks and is judged to contain a plurality of organic matters; the exothermic peaks are all less than 800 ℃; the onset of salt melting is indicated by the appearance of an endothermic peak at >800 ℃.

Detailed Description

The invention is further illustrated by the following specific examples:

the embodiment of the invention takes waste sodium sulfate waste salt of waste cooking agent in the pulp production process of a certain paper mill, and the waste salt of the raw materials is analyzed to have the sodium sulfate content of about 82.83 percent, the organic matter content of about 11.08 percent and the water content of about 4.82 percent; the specific implementation steps of the embodiment are as follows:

example 1

A method for resource utilization of waste sodium sulfate salt comprises the following steps:

step one, cooperative treatment: uniformly mixing 200kg of sodium sulfate waste salt and 0.6kg 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, the sodium sulfate waste salt mixed material is firstly treated at a lower temperature for 10min and then heated to 850 ℃, and the reaction time is 20 min; the material chamber be in anaerobic heating state, the flue gas and the air that the organic matter produced according to the volume ratio 0.8: 0.6 of 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 cracking aid is prepared by the following method:

adding 3.4kg of aluminum acrylate into 10kg of alpha, omega-dimercaptopolyethylene glycol, 2.5kg of allyl phenylsulfone, 3kg of sodium methoxide and 100kg of white oil, stirring and reacting at the temperature of 50 ℃ for 100min, filtering after the reaction is finished, drying, and transferring the mixture to a grinder; then 100kg of diatomite, 10kg of active kaolin and 1.2kg of rare earth oxide are added into a grinding machine, and the grinding is continued for 10min, thus preparing the organic cracking aid.

Step two, dissolving 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 then carrying out solid-liquid separation to obtain a salt solution and an insoluble substance;

step three, evaporation and crystallization: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain the 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 slurry has a solid content of 10%.

The lower temperature is 350 ℃.

And calcining the insoluble substances for 6h at 500 ℃ in the air atmosphere to obtain the recovered organic matter cracking auxiliary agent.

Example 2

A method for resource utilization of waste sodium sulfate salt comprises the following steps:

step one, cooperative treatment: uniformly mixing 230kg of sodium sulfate waste salt with 0.9kg 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, heat of a cement kiln is introduced into the pyrolysis equipment to heat the sodium sulfate waste salt mixed material in the material chamber, the sodium sulfate waste salt mixed material is firstly treated at a lower temperature for 20min and then heated to 950 ℃, and the reaction time is 40 min; the material chamber be in anaerobic heating state, the flue gas and the air that the organic matter produced according to the volume ratio 0.8: 0.9 of 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 cracking aid is prepared by the following method:

adding 7kg of alpha, omega-dimercaptopolyethylene glycol, 4kg of allyl phenylsulfone, 5kg of sodium methoxide and 150kg of white oil into 5kg of aluminum acrylate, stirring and reacting at the temperature of 54 ℃ for 140min, filtering after the reaction is finished, drying, and transferring to a grinding machine; and adding 125kg of diatomite, 20kg of active kaolin and 2.5kg of rare earth oxide into a grinding machine, and continuously grinding for 20min to obtain the organic matter cracking aid. Step two, dissolving treatment: dissolving the treated sodium sulfate waste residue with tap water at a solid-liquid ratio of 1:5.2 and a dissolving temperature of 60 ℃, and then carrying out solid-liquid separation to obtain a salt solution and an insoluble substance;

step three, evaporation and crystallization: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain the 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 slurry had a solids content of 14%.

The lower temperature is 450 ℃.

And calcining the insoluble substances for 5h at 550 ℃ in the air atmosphere to obtain the recovered organic matter cracking auxiliary agent.

Example 3

A method for resource utilization of waste sodium sulfate salt comprises the following steps:

step one, cooperative treatment: uniformly mixing 260kg of sodium sulfate waste salt and 1.2kg 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, heat of a cement kiln is introduced into the pyrolysis equipment to heat the sodium sulfate waste salt mixed material in the material chamber, the sodium sulfate waste salt mixed material is firstly treated at a lower temperature for 30min and then heated to 1000 ℃, and the reaction time is 60 min; the material chamber be in anaerobic heating state, the flue gas and the air that the organic matter produced according to the volume ratio 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 cracking aid is prepared by the following method:

adding 6.7kg of aluminum acrylate into 15kg of alpha, omega-dimercaptopolyethylene glycol, 5.5kg of allyl phenylsulfone, 6kg of sodium methoxide and 200kg of white oil, stirring and reacting for 180min at the temperature of 58 ℃, filtering, drying and transferring to a grinding machine; and adding 150kg of diatomite, 30kg of active kaolin and 3.8kg of rare earth oxide into a grinding machine, and continuously grinding for 30min to obtain the organic matter cracking aid.

Step two, dissolving treatment: dissolving the treated sodium sulfate waste residue with tap water at a solid-liquid ratio of 1: 6.8 and a dissolving temperature of 70 ℃, and then carrying out solid-liquid separation to obtain a salt solution and an insoluble substance;

step three, evaporation and crystallization: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain the 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 glycol is glycol 6000.

The slurry has a solids content of 18%.

The lower temperature is 550 ℃.

And calcining the insoluble substances for 4 hours at 650 ℃ in the air atmosphere to obtain the recovered organic matter cracking aid.

A thermogravimetric analyzer, STA 449F 3 from Chiari corporation was used. The adopted atmosphere is air, the mass of a sample to be tested each time is about 16mg, and the waste salt sample after synergistic treatment is placed into an alumina crucible for testing during analysis, wherein the flow rate of carrier gas is 50 ml/min. The residual amount of carbides of the waste salt after the weight reduction reaction treatment in the air atmosphere. The recovery rate of sodium sulfate was calculated as the ratio of the recovery amount of the reagent to the theoretical recovery amount, and the test results are shown in the following table:

recovery ratio (%) of sodium sulfate carbide (%)

Example 185.970.42

Example 287.830.31

Example 392.210.19

Comparative example 1

A method for resource utilization of waste sodium sulfate salt comprises the following steps:

step one, cooperative treatment: 200kg of sodium sulfate waste salt is fed 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 introduced into the pyrolysis equipment to heat a sodium sulfate waste salt mixed material in the material chamber, the sodium sulfate waste salt mixed material is firstly treated at a lower temperature for 10min and then heated to 850 ℃, and the reaction time is 20 min; the material chamber be in anaerobic heating state, the flue gas and the air that the organic matter produced according to the volume ratio 0.8: 0.6 of the mixture enters a cement kiln decomposing furnace through a pipeline, and enters a cement kiln waste gas system after being fully combusted;

step two, dissolving 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 then carrying out solid-liquid separation to obtain a salt solution and an insoluble substance;

step three, evaporation and crystallization: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain the recovered anhydrous sodium sulfate product.

The lower temperature is 350 ℃.

Comparative example 2

A method for resource utilization of waste sodium sulfate salt comprises the following steps:

step one, cooperative treatment: uniformly mixing 200kg of sodium sulfate waste salt and 0.6kg 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, the sodium sulfate waste salt mixed material is firstly treated at a lower temperature for 10min and then heated to 850 ℃, and the reaction time is 20 min; the material chamber be in anaerobic heating state, the flue gas and the air that the organic matter produced according to the volume ratio 0.8: 0.6 of 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 cracking aid is prepared by the following method:

adding 10kg of alpha, omega-dimercaptopolyethylene glycol, 3kg of sodium methoxide and 100kg of white oil into 3.4kg of aluminum acrylate, stirring and reacting for 100min at the temperature of 50 ℃, filtering after reaction, drying, and transferring to a grinding machine; then 100kg of diatomite, 10kg of active kaolin and 1.2kg of rare earth oxide are added into a grinding machine, and the grinding is continued for 10min, thus preparing the organic cracking aid.

Step two, dissolving 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 then carrying out solid-liquid separation to obtain a salt solution and an insoluble substance;

step three, evaporation and crystallization: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain the recovered anhydrous sodium sulfate product.

The ethylene glycol is ethylene glycol 1000.

The slurry has a solid content of 10%.

The lower temperature is 350 ℃.

And calcining the insoluble substances for 6h at 500 ℃ in the air atmosphere to obtain the recovered organic matter cracking auxiliary agent.

Comparative example 3

A method for resource utilization of waste sodium sulfate salt comprises the following steps:

step one, cooperative treatment: uniformly mixing 200kg of sodium sulfate waste salt and 0.6kg 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, the sodium sulfate waste salt mixed material is firstly treated at a lower temperature for 10min and then heated to 850 ℃, and the reaction time is 20 min; the material chamber be in anaerobic heating state, the flue gas and the air that the organic matter produced according to the volume ratio 0.8: 0.6 of 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 cracking aid is prepared by the following method:

adding 10kg of alpha, omega-dimercaptopolyethylene glycol, 2.5kg of allyl phenylsulfone, 3kg of sodium methoxide and 100kg of white oil, stirring and reacting for 100min at the temperature of 50 ℃, filtering, drying and transferring to a grinder; then 100kg of diatomite, 10kg of active kaolin and 1.2kg of rare earth oxide are added into a grinding machine, and the grinding is continued for 10min, thus preparing the organic cracking aid.

Step three, evaporation and crystallization: evaporating, cooling and crystallizing the salt solution to obtain sodium sulfate crystals, and drying to obtain the 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 slurry has a solid content of 10%.

The lower temperature is 350 ℃.

And calcining the insoluble substances for 6h at 500 ℃ in the air atmosphere to obtain the recovered organic matter cracking auxiliary agent.

The test results for the comparative example for the treatment of waste sodium sulphate salts are shown in the following table:

	recovery ratio of sodium sulfate (%)	Carbide (%)
			Comparative example 1	74.71	6.31
Comparative example 2	79.52	2.14
			Comparative example 3	83.24	0.67