CN113814349A - A kind of recycling method and system of water-soluble waste composite salt core for foundry - Google Patents
A kind of recycling method and system of water-soluble waste composite salt core for foundry Download PDFInfo
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- CN113814349A CN113814349A CN202111145444.0A CN202111145444A CN113814349A CN 113814349 A CN113814349 A CN 113814349A CN 202111145444 A CN202111145444 A CN 202111145444A CN 113814349 A CN113814349 A CN 113814349A
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- 150000003839 salts Chemical group 0.000 title claims abstract description 158
- 238000004064 recycling Methods 0.000 title claims abstract description 76
- 239000002699 waste material Substances 0.000 title claims abstract description 73
- 239000002131 composite material Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 62
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 95
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 73
- 239000012267 brine Substances 0.000 claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000000203 mixture Substances 0.000 claims abstract description 63
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 48
- 238000005185 salting out Methods 0.000 claims abstract description 47
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 45
- 238000005266 casting Methods 0.000 claims abstract description 39
- 230000008569 process Effects 0.000 claims abstract description 26
- 238000001914 filtration Methods 0.000 claims abstract description 24
- 238000001556 precipitation Methods 0.000 claims abstract description 11
- 239000011259 mixed solution Substances 0.000 claims abstract description 8
- 230000009471 action Effects 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 37
- 239000003623 enhancer Substances 0.000 claims description 22
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 21
- 239000000843 powder Substances 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 14
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 abstract 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 33
- 239000011780 sodium chloride Substances 0.000 description 25
- 238000002425 crystallisation Methods 0.000 description 11
- 230000008025 crystallization Effects 0.000 description 11
- 238000005452 bending Methods 0.000 description 9
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 8
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 8
- 238000011084 recovery Methods 0.000 description 8
- 238000001035 drying Methods 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 238000004090 dissolution Methods 0.000 description 4
- 235000011164 potassium chloride Nutrition 0.000 description 4
- 239000001103 potassium chloride Substances 0.000 description 4
- 235000010333 potassium nitrate Nutrition 0.000 description 4
- 239000004323 potassium nitrate Substances 0.000 description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 description 3
- 235000011152 sodium sulphate Nutrition 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/105—Salt cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
- B22D29/001—Removing cores
- B22D29/002—Removing cores by leaching, washing or dissolving
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
- B22D29/001—Removing cores
- B22D29/005—Removing cores by vibrating or hammering
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
本发明属于铸造相关技术领域，其公开了一种铸造用水溶性废旧复合盐芯的循环回用方法及系统，该方法包括以下步骤：(1)铸造完成后，将得到的铸件连同水溶性复合盐芯放入清水中，并施加超声波，水溶性废旧复合盐芯在超声波作用下与铸件分离，同时得到含有高浓度盐水与不溶于水的增强剂的混合物；(2)将混合物冷却到室温以结晶析出部分无机盐，并获得含有低浓度盐水、无机盐及增强剂的混合物；(3)向混合物中加入盐析剂以促使无机盐的析出，并将当前的混合物依次进行整体过滤及分离，以得到无机盐及增强剂；(4)采用精馏方法将所述盐析剂自过滤后剩下的混合液中分离出来，以得到盐析剂及清水。本发明工艺流程简单，易于实现工业化应用。
The invention belongs to the technical field of casting, and discloses a method and a system for recycling a water-soluble waste composite salt core for casting. The core is put into clear water, and ultrasonic waves are applied, and the water-soluble waste composite salt core is separated from the casting under the action of ultrasonic waves, and a mixture containing high-concentration brine and water-insoluble reinforcing agent is obtained at the same time; (2) The mixture is cooled to room temperature to crystallize Part of the inorganic salts are precipitated, and a mixture containing low-concentration brine, inorganic salts and a reinforcing agent is obtained; (3) a salting-out agent is added to the mixture to promote the precipitation of the inorganic salts, and the current mixture is sequentially filtered and separated as a whole, to Obtain the inorganic salt and the enhancing agent; (4) adopt the rectification method to separate the salting-out agent from the remaining mixed solution after filtration to obtain the salting-out agent and clear water. The technological process of the invention is simple, and the industrial application is easy to realize.
Description
Technical Field
The invention belongs to the technical field of casting correlation, and particularly relates to a recycling method and a recycling system of a water-soluble waste composite salt core for casting.
Background
The water-soluble salt core is prepared from an inorganic salt material which is easy to dissolve in water by a melt casting method or a pressing sintering method, has the advantages of good surface quality, high strength, low gas forming property, good collapsibility and the like, and has wide application prospect in the manufacturing of slender and complex cavity structure castings. Generally, a water-insoluble powder reinforcing agent is added into a salt core to reinforce the mechanical property of the salt core so as to meet the performance requirement in the service process. After the water-soluble salt core is applied to the casting cleaning, a large amount of waste salt water can be generated, if the waste salt water is directly discharged, not only can the water resource be seriously polluted, but also inorganic salt materials and powder reinforcing agent materials are wasted, and the green development of the salt core is not facilitated.
The water-soluble salt core can be taken out from the casting through the dissolving action of water, the powder reinforcing agent material which is insoluble in water in the salt core can be precipitated in the salt water, the salt water and the powder reinforcing agent can be separated by directly adopting a filtering method, the reinforcing agent material is directly reused in the preparation of the water-soluble salt core, but the inorganic salt in the salt water can not be directly reused in the preparation of the salt core. At present, no mature technology exists for reusing inorganic salts in brine in the preparation of salt cores at low cost. Furthermore, a plurality of inorganic salts are usually present in the brine, which increases the difficulty of recycling the salt core.
Al has been studied in the literature2O3The particle-reinforced NaCl salt core is recycled, the water-soluble salt core is dissolved at high temperature, and NaCl aqueous solution and Al are obtained after filtration and separation2O3And (3) granules. Al (Al)2O3The particles are directly reused in the preparation of the water-soluble salt core; and recovering NaCl inorganic salt from the NaCl aqueous solution through evaporation and crystallization, and reusing the NaCl inorganic salt in the preparation of the water-soluble salt core. The recycling method of the salt core directly evaporates and crystallizes the brine to obtain the inorganic salt, consumes huge energy, causes higher recycling cost of the salt core, and is not suitable for industrial application.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a method and a system for recycling water-soluble waste and old composite salt cores for casting, which are characterized in that high-concentration brine is obtained through ultrasonic-assisted dissolution, part of inorganic salt is separated out through cooling crystallization, and then a salting-out agent is added into the low-concentration brine for further crystallization to separate out the inorganic salt, so that the brine is prevented from being directly evaporated and recycled in the whole recycling process, the low-cost recycling of the waste and old composite salt cores can be realized, and the problem of environmental pollution caused by the brine generated by the waste and old salt cores after the composite salt cores are applied in large quantities is solved.
In order to achieve the above object, according to one aspect of the present invention, there is provided a recycling method of water-soluble waste composite salt cores for casting, the recycling method mainly comprising the steps of:
(1) after casting, putting the obtained casting and the water-soluble composite salt core into clear water, applying ultrasonic waves, separating the water-soluble waste composite salt core from the casting under the action of the ultrasonic waves, and simultaneously obtaining a mixture containing high-concentration salt water and a water-insoluble reinforcing agent;
(2) cooling the resulting mixture to room temperature to crystallize out a portion of the inorganic salt and obtain a mixture comprising a low concentration brine, the inorganic salt, and the enhancer;
(3) adding a salting-out agent into the newly obtained mixture to promote further precipitation of the inorganic salt, and sequentially carrying out integral filtration and separation on the current mixture to obtain the inorganic salt and an enhancer;
(4) separating the salting-out agent from the mixed solution left after filtering by adopting a rectification method to obtain the salting-out agent and clear water;
wherein the high-concentration brine is saturated or supersaturated brine at the temperature of 30-80 ℃; the low-concentration brine is saturated brine at the temperature of 10-25 ℃.
Further, the ultrasonic power adopted in the step (1) is 100W-1200W, and the ultrasonic time is 15 min-120 min.
Further, the salting-out agent comprises one or more of methanol, ethanol, acetone and diethylamine.
Furthermore, the addition amount of the salting-out agent is 0.3 to 2.5 times of the mass of the low-concentration brine.
Furthermore, the addition amount of the salting-out agent is 0.5 to 1.5 times of the mass of the low-concentration brine.
Further, the inorganic salt separated in the step (3) is crystallized and precipitated in the processes of cooling high-concentration brine and adding a salting-out agent into low-concentration brine; and (4) directly reusing the salting-out agent obtained in the step (4) in low-concentration brine, and directly reusing clear water in a clear water tank for dissolving and removing the waste salt cores.
Further, the temperature used for rectifying the salting-out agent from the mixed solution is 50 to 80 ℃.
Further, the components of the water-soluble composite salt core comprise a plurality of inorganic salt materials and powder reinforcing agent materials, and the mass ratio of the inorganic salt materials to the reinforcing agent materials is (65-100%): (0% to 35%).
According to another aspect of the invention, a recycling system of water-soluble waste composite salt cores for casting is provided, and the recycling system recycles the water-soluble waste composite salt cores for casting by adopting the recycling method of the water-soluble waste composite salt cores for casting.
In general, compared with the prior art, the water-soluble waste composite salt core recycling method and system for casting provided by the invention mainly comprise the following steps:
1. the inorganic salt material is recovered through temperature reduction and the influence of the salting-out agent on the solubility of the inorganic salt in the brine, the brine is prevented from being directly evaporated, crystallized and recovered, the low-cost recycling of the waste composite salt core can be realized, only one-time filtration and separation are needed in the recycling process of the salt core, the process flow is simple, and the industrial application is easy to realize.
2. Ultrasonic-assisted dissolution is adopted in the recycling process of the waste composite salt core, so that the removal efficiency of the salt core can be improved, the temperature of salt water can be increased, the concentration of the salt water is increased, and the recycling efficiency of the salt core and the recovery rate of inorganic salt can be improved.
3. The one-time recycling process can realize recycling of more than 80% of inorganic salt materials and 100% of reinforcing agent materials in the waste composite salt core, obviously reduces the preparation cost of the composite salt core, and can effectively reduce the problem of environmental pollution caused by waste brine.
4. By the recycling method provided by the invention, the bending strength of the salt core after 3 times of recycling can still reach more than 90% of the bending strength of the original salt core.
Drawings
FIG. 1 is a schematic flow chart of the preparation and waste recycling of the water-soluble composite salt core according to the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, the recycling method of the water-soluble waste composite salt core for casting provided by the invention mainly comprises the following steps:
step one, after the water-soluble composite salt core is used for casting a cavity structure part, the obtained casting and the waste salt core are placed into a clean water tank together, and the waste salt core is dissolved under the action of ultrasonic waves and separated from the casting to obtain a mixture of high-concentration salt water and a water-insoluble reinforcing agent.
The water-soluble composite salt core comprises a plurality of inorganic salt materials and powder reinforcing agent materials, wherein the mass ratio of the inorganic salt materials to the reinforcing agent materials is (65-100%): (0% to 35%). The ultrasonic power is 100W-1200W, and the ultrasonic time is 15 min-120 min.
The ultrasonic cavitation can not only accelerate the dissolution of the salt core and improve the removal efficiency of the salt core, but also improve the temperature of the saline water and increase the concentration of the saline water. The power and time of the ultrasound-assisted dissolution of the salt core is largely dependent on the temperature of the saline, ensuring that the temperature of the saline is near the maximum solubility of the salt core. The high-concentration brine refers to saturated or supersaturated brine at 30-80 ℃.
And step two, cooling the obtained mixture to room temperature to crystallize and separate out part of inorganic salt, and obtaining a mixture of low-concentration brine, inorganic salt and reinforcing agent.
Specifically, the low-concentration brine is saturated brine at 10 ℃ to 25 ℃. The high-concentration brine is cooled to room temperature, and the crystallized inorganic salt is obtained by reducing the solubility of the inorganic salt.
And step three, adding a salting-out agent into the newly obtained mixture to promote further crystallization and precipitation of inorganic salt, sequentially carrying out integral filtration and separation on the current mixture, and then drying the obtained inorganic salt and the reinforcing agent for integral recycling.
Specifically, the salting-out agent mainly comprises one or more of methanol, ethanol, acetone and diethylamine; the addition amount of the salting-out agent is 0.3 to 2.5 times, preferably 0.5 to 1.5 times of the mass of the low-concentration brine.
Wherein the inorganic salt obtained by separation is the inorganic salt which is crystallized and separated out in the process of cooling high-concentration brine and in the process of adding salting-out agent into low-concentration brine.
And step four, separating the salting-out agent from the mixed solution left after filtering by adopting a rectification method to obtain the salting-out agent and clear water. Wherein, the salting-out agent is directly reused in low-concentration brine, and the clear water is directly reused in a clear water tank for dissolving and removing the waste salt core.
Specifically, the temperature for rectifying the salting-out agent from the mixture of water and the salting-out agent is 50 ℃ to 80 ℃. In the recycling process of the water-soluble waste composite salt core, the inorganic salt and the reinforcing agent are integral materials and are directly recycled in the preparation of the water-soluble composite salt core.
The invention also provides a recycling system of the water-soluble waste composite salt core for casting, which recycles the water-soluble waste composite salt core for casting by adopting the recycling method of the water-soluble waste composite salt core for casting.
The present invention is further illustrated in detail below with reference to several examples.
Example 1
The material of the water-soluble salt core related to embodiment 1 of the invention comprises 70 parts by mass of inorganic salt (sodium sulfate and sodium chloride) and 30 parts by mass of powder reinforcing agent, and the provided recycling method of the water-soluble waste composite salt core comprises the following steps:
(1) in the ultrasonic-assisted dissolving process of the waste composite salt core, the ultrasonic power is 100W, the ultrasonic time is 80min, and the ultrasonic can be operated intermittently to ensure that the temperature of the saline water is about 40 ℃, so that the mixture of high-concentration saline water and the water-insoluble powder reinforcing agent is obtained.
(2) The resulting mixture was cooled to room temperature to crystallize out a part of the inorganic salt, obtaining a mixture of a low concentration brine, inorganic salt and reinforcing agent. Wherein the inorganic salt and the enhancer material are precipitated in a low concentration brine.
(3) Adding methanol with the mass 1 time of that of the low-concentration brine into the obtained latest mixture to promote further crystallization and precipitation of inorganic salt, further sequentially carrying out integral filtration and separation on the current mixture, and drying the obtained inorganic salt and the reinforcing agent for integral recycling. Wherein, the obtained inorganic salt and the reinforcing agent can be used as raw materials of the salt core to prepare the water-soluble salt core.
(4) And rectifying the remaining mixed solution after filtration at 65 ℃ to obtain a salting-out agent and clear water, wherein the obtained salting-out agent is directly reused in low-concentration brine, and the clear water is directly reused in a clear water tank for dissolving and removing waste salt cores.
Through recycling of the waste composite salt core, the recovery rate of the inorganic salt in the primary recycling process can reach 82.5%, and the bending strength of the salt core after 3 times of recycling can still reach more than 91% of that of the original salt core.
Example 2
The material of the water-soluble salt core related to embodiment 2 of the invention comprises 80 parts by mass of inorganic salt (sodium sulfate and sodium chloride) and 20 parts by mass of powder reinforcing agent, and the provided recycling method of the water-soluble waste composite salt core comprises the following steps:
(1) in the ultrasonic-assisted dissolving process of the water-soluble waste composite salt core, the ultrasonic power is 500W, the ultrasonic time is 50min, the ultrasonic can be operated intermittently, the temperature of the saline water is ensured to be about 40 ℃, and the mixture of the high-concentration saline water and the water-insoluble reinforcing agent is obtained.
(2) The resulting mixture is cooled to room temperature to crystallize out a portion of the inorganic salt and obtain a mixture of a low concentration brine, the inorganic salt, and the enhancer, wherein the inorganic salt and the enhancer material precipitate in the low concentration brine.
(3) Acetone with the mass 1.5 times of that of the low-concentration brine is added into the latest mixture to promote further crystallization and precipitation of inorganic salt, the mixture is sequentially subjected to integral filtration and separation, the obtained inorganic salt and the reinforcing agent are dried and integrally recycled, and the mixture can be used as a raw material of a salt core to prepare a water-soluble salt core.
(4) The remaining mixture after filtration was rectified at 56 ℃ to obtain a salting-out agent and clear water. Wherein, the salting-out agent can be directly reused in low-concentration brine, and the clear water can be directly reused in a clear water tank for dissolving and removing the waste salt core.
Through recycling of the water-soluble waste composite salt core, the recovery rate of the inorganic salt in the primary recycling process can reach 83.4%, and the bending strength of the salt core after 3 times of recycling can still reach more than 93% of that of the original salt core.
Example 3
The material of the water-soluble salt core related to embodiment 3 of the invention comprises 90 parts by mass of inorganic salt (sodium sulfate and sodium chloride) and 10 parts by mass of powder reinforcing agent, and the provided recycling method of the water-soluble waste composite salt core comprises the following steps:
(1) in the ultrasonic-assisted dissolving process of the water-soluble waste composite salt core, the ultrasonic power is 1000W, the ultrasonic time is 20min, and the ultrasonic operation can be carried out intermittently to ensure that the temperature of the saline water is about 40 ℃ so as to obtain a mixture of high-concentration saline water and a water-insoluble reinforcing agent.
(2) The resulting mixture was cooled to room temperature, and a portion of the inorganic salt crystallized out, and a mixture of low concentration brine, inorganic salt and enhancer was obtained. Wherein the inorganic salt and the enhancer material are precipitated in a low concentration brine.
(3) Adding ethanol with the mass 2 times of that of the low-concentration brine into the current mixture to promote further crystallization and precipitation of inorganic salt, sequentially carrying out integral filtration and separation on the mixture, and integrally drying and recycling the obtained inorganic salt and the reinforcing agent, wherein the obtained inorganic salt and the reinforcing agent can be used as raw materials of a salt core to prepare the water-soluble salt core.
(4) The mixture left after filtration was subjected to rectification at 80 ℃ to obtain a salting-out agent and clear water. Wherein, the salting-out agent is directly reused in low-concentration brine, and the clear water is directly reused in a clear water tank for dissolving and removing the waste salt core.
Through recycling of the water-soluble waste composite salt core, the recovery rate of the inorganic salt in the primary recycling process can reach 84.9%, and the bending strength of the salt core after 3 times of recycling can still be more than 95% of that of the original salt core.
Example 4
The material of the water-soluble salt core related to embodiment 4 of the invention comprises 70 parts by mass of inorganic salt (potassium nitrate and potassium chloride) and 30 parts by mass of powder reinforcing agent, and the provided recycling method of the water-soluble waste composite salt core comprises the following steps:
(1) in the ultrasonic-assisted dissolving process of the water-soluble waste composite salt core, the ultrasonic power is 800W, the ultrasonic time is 60min, and the ultrasonic department performs intermittent operation to ensure that the temperature of saline water is about 80 ℃, so as to obtain a mixture of high-concentration saline water and a water-insoluble reinforcing agent.
(2) The resulting mixture was cooled to room temperature to crystallize out a part of the inorganic salt, and a mixture of a low concentration brine, inorganic salt and reinforcing agent was obtained. Wherein the inorganic salt and the enhancer material are precipitated in a low concentration brine.
(3) Adding methanol with the mass 1.5 times of that of the low-concentration brine into the current mixture to promote further crystallization and precipitation of inorganic salt, sequentially carrying out integral filtration and separation on the mixture, and integrally drying and recycling the obtained inorganic salt and the reinforcing agent, wherein the obtained inorganic salt and the reinforcing agent can be used as raw materials of a salt core to prepare the water-soluble salt core.
(4) The mixed solution remaining after filtration was subjected to rectification at 65 ℃ to obtain a salting-out agent and clear water. Wherein, the salting-out agent is directly reused in low-concentration brine, and the clear water is directly reused in a clear water tank for dissolving and removing the waste salt core.
Through recycling of the water-soluble waste composite salt core, the recovery rate of the inorganic salt in the primary recycling process can reach 89.8%, and the bending strength of the salt core after 3 times of recycling can still reach more than 93% of that of the original salt core.
Example 5
The material of the water-soluble salt core related to the embodiment 5 of the invention comprises 80 parts by mass of inorganic salt (potassium nitrate and potassium chloride) and 20 parts by mass of powder reinforcing agent, and the provided recycling method of the water-soluble waste composite salt core comprises the following steps:
(1) in the ultrasonic-assisted dissolving process of the water-soluble waste composite salt core, the ultrasonic power is 600W, the ultrasonic time is 80min, and the ultrasonic can be operated intermittently to ensure that the temperature of the saline water is about 80 ℃, so that a mixture of high-concentration saline water and a water-insoluble reinforcing agent is obtained.
(2) The resulting mixture is cooled to room temperature and a portion of the inorganic salts crystallize out and a mixture of low-concentration brine, inorganic salts and enhancer material is obtained, wherein the inorganic salts and enhancer material precipitate in the low-concentration brine.
(3) Adding acetone with the mass 1 time of that of the low-concentration brine into the obtained mixture to promote further crystallization and precipitation of inorganic salt, sequentially carrying out integral filtration and separation on the mixture to obtain the inorganic salt and the reinforcing agent, drying and then integrally recycling the inorganic salt and the reinforcing agent to prepare the water-soluble salt core serving as a raw material of the salt core.
(4) The remaining mixture after filtration was distilled at 56 ℃ to obtain a salting-out agent and clear water. Wherein, the salting-out agent is directly reused in low-concentration brine, and the clear water is directly reused in a clear water tank for dissolving and removing the waste salt core.
Through recycling of the water-soluble waste composite salt core, the recovery rate of the inorganic salt in the primary recycling process can reach 88.5%, and the bending strength of the salt core after 3 times of recycling can still reach more than 95% of the original salt core.
Example 6
The material of the water-soluble salt core related to embodiment 6 of the invention comprises 70 parts by mass of inorganic salt (potassium nitrate and potassium chloride) and 30 parts by mass of powder reinforcing agent, and the provided recycling method of the water-soluble waste composite salt core comprises the following steps:
(1) in the ultrasonic-assisted dissolving process of the water-soluble waste composite salt core, the ultrasonic power is 300W, the ultrasonic time is 100min, and the ultrasonic can be operated intermittently to ensure that the temperature of the saline water is about 80 ℃, so that a mixture of high-concentration saline water and a water-insoluble reinforcing agent is obtained.
(2) The resulting mixture was cooled to room temperature, and a portion of the inorganic salt crystallized out, and a mixture of low concentration brine, inorganic salt and enhancer was obtained. Wherein the inorganic salt and the enhancer material are precipitated in a low concentration brine.
(3) And adding methanol with the mass 1 time of that of the low-concentration brine into the obtained mixture to promote further crystallization and precipitation of inorganic salt, sequentially carrying out integral filtration and separation on the mixture to obtain inorganic salt and an enhancer, drying the inorganic salt and the enhancer, and then integrally recycling the mixture, wherein the obtained inorganic salt and the enhancer are used as raw materials of a salt core to prepare the water-soluble salt core.
(4) The remaining mixture after filtration was subjected to rectification at 65 ℃ to obtain a salting-out agent and clear water. Wherein, the salting-out agent is directly reused in low-concentration brine, and the clear water is directly reused in a clear water tank for dissolving and removing the waste salt core.
Through recycling of the water-soluble waste composite salt core, the recovery rate of the inorganic salt in the primary recycling process can reach 89.2%, and the bending strength of the salt core after 3 times of recycling can still reach more than 95% of that of the original salt core.
Example 7
The material of the water-soluble salt core related to embodiment 7 of the invention comprises 100 parts by mass of inorganic salt (potassium nitrate and potassium chloride), and the provided recycling method of the water-soluble waste composite salt core comprises the following steps:
(1) in the ultrasonic-assisted dissolving process of the water-soluble waste composite salt core, the ultrasonic power is 1000W, the ultrasonic time is 30min, the ultrasonic can be operated intermittently, the temperature of the saline water is ensured to be about 80 ℃, and the mixture of the high-concentration saline water and the water-insoluble reinforcing agent is obtained.
(2) The resulting mixture was cooled to room temperature, and a portion of the inorganic salt crystallized out, and a mixture of low concentration brine, inorganic salt and enhancer was obtained. Wherein the inorganic salt and the enhancer material are precipitated in a low concentration brine.
(3) And adding methanol with the mass 1.5 times that of the low-concentration brine into the obtained mixture to promote further crystallization and precipitation of inorganic salt, sequentially carrying out integral filtration and separation on the mixture to obtain inorganic salt and an enhancer, and then drying the inorganic salt and the enhancer for integral recycling, wherein the obtained inorganic salt and the enhancer are used as raw materials of a salt core to prepare the water-soluble salt core.
(4) The remaining mixture after filtration was subjected to rectification at 65 ℃ to obtain a salting-out agent and clear water. Wherein, the salting-out agent is directly reused in low-concentration brine, and the clear water is directly reused in a clear water tank for dissolving and removing the waste salt core.
Through recycling of the water-soluble waste composite salt core, the recovery rate of the inorganic salt in the primary recycling process can reach 88.1%, and the bending strength of the salt core after 3 times of recycling can still reach more than 94% of the original salt core.
The invention integrally recycles the inorganic salt and the reinforcing agent material by reducing the temperature and influencing the solubility of the salting-out agent on the inorganic salt in the brine, avoids directly evaporating and crystallizing a large amount of brine to recycle the inorganic salt, can realize the low-cost recycling of the water-soluble waste composite salt core, solves the problem of environmental pollution caused by waste brine generated after the composite salt core is applied in a large amount, and can reduce the manufacturing cost of the composite salt core.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A recycling method of water-soluble waste composite salt cores for casting is characterized by comprising the following steps:
(1) after casting, putting the obtained casting and the water-soluble composite salt core into clear water, applying ultrasonic waves, separating the water-soluble waste composite salt core from the casting under the action of the ultrasonic waves, and simultaneously obtaining a mixture containing high-concentration salt water and a water-insoluble reinforcing agent;
(2) cooling the resulting mixture to room temperature to crystallize out a portion of the inorganic salt and obtain a mixture comprising a low concentration brine, the inorganic salt, and the enhancer;
(3) adding a salting-out agent into the newly obtained mixture to promote further precipitation of the inorganic salt, and sequentially carrying out integral filtration and separation on the current mixture to obtain the inorganic salt and an enhancer;
(4) separating the salting-out agent from the mixed solution left after filtering by adopting a rectification method to obtain the salting-out agent and clear water;
wherein the high-concentration brine is saturated or supersaturated brine at the temperature of 30-80 ℃; the low-concentration brine is saturated brine at the temperature of 10-25 ℃.
2. The recycling method of the water-soluble waste composite salt core for casting according to claim 1, characterized in that: the ultrasonic power adopted in the step (1) is 100W-1200W, and the ultrasonic time is 15 min-120 min.
3. The recycling method of the water-soluble waste composite salt core for casting according to claim 1, characterized in that: the salting-out agent comprises one or more of methanol, ethanol, acetone and diethylamine.
4. The recycling method of the water-soluble waste composite salt core for casting according to claim 3, characterized in that: the addition amount of the salting-out agent is 0.3 to 2.5 times of the mass of the low-concentration brine.
5. The recycling method of the water-soluble waste composite salt core for casting according to claim 4, characterized in that: the addition amount of the salting-out agent is 0.5 to 1.5 times of the mass of the low-concentration brine.
6. The recycling method of the water-soluble waste composite salt core for casting according to claim 1, characterized in that: the inorganic salt obtained by separation in the step (3) is crystallized and separated out in the processes of cooling high-concentration brine and adding a salting-out agent into low-concentration brine; and (4) directly reusing the salting-out agent obtained in the step (4) in low-concentration brine, and directly reusing clear water in a clear water tank for dissolving and removing the waste salt cores.
7. The recycling method of the water-soluble waste composite salt core for casting according to any one of claims 1 to 6, characterized in that: the temperature adopted when the salting-out agent is rectified from the mixed solution is 50 ℃ to 80 ℃.
8. The recycling method of the water-soluble waste composite salt core for casting according to claim 1, characterized in that: the water-soluble composite salt core comprises a plurality of inorganic salt materials and powder reinforcing agent materials, wherein the mass ratio of the inorganic salt materials to the reinforcing agent materials is (65-100%): (0% to 35%).
9. The recycling system of the water-soluble waste and old composite salt core for casting, which recycles the water-soluble waste and old composite salt core by adopting the recycling method of the water-soluble waste and old composite salt core for casting of any one of claims 1 to 8.
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