CN113814349B - Recycling method and system of water-soluble waste composite salt core for casting - Google Patents

Recycling method and system of water-soluble waste composite salt core for casting Download PDF

Info

Publication number
CN113814349B
CN113814349B CN202111145444.0A CN202111145444A CN113814349B CN 113814349 B CN113814349 B CN 113814349B CN 202111145444 A CN202111145444 A CN 202111145444A CN 113814349 B CN113814349 B CN 113814349B
Authority
CN
China
Prior art keywords
water
salt
salt core
casting
salting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202111145444.0A
Other languages
Chinese (zh)
Other versions
CN113814349A (en
Inventor
樊自田
龚小龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huazhong University of Science and Technology
Original Assignee
Huazhong University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huazhong University of Science and Technology filed Critical Huazhong University of Science and Technology
Priority to CN202111145444.0A priority Critical patent/CN113814349B/en
Publication of CN113814349A publication Critical patent/CN113814349A/en
Application granted granted Critical
Publication of CN113814349B publication Critical patent/CN113814349B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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

Landscapes

  • 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

The invention belongs to the technical field of casting correlation, and discloses a recycling method and a recycling system of water-soluble waste composite salt cores for casting, wherein the method comprises 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 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 mixture to promote the precipitation of inorganic salt, and sequentially carrying out integral filtration and separation on the current mixture to obtain 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. The method has simple process flow and is easy to realize industrial application.

Description

Method and system for recycling water-soluble waste composite salt core for casting
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 castings with slender complex cavity structures. 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, various inorganic salts are usually present in the brine, which increases the difficulty of recycling the salt core.
Al has been studied in the literature 2 O 3 The 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 separation 2 O 3 And (3) granules. Al (Al) 2 O 3 The 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 respective 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 fractionating 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) And adding methanol with the mass 1 time that of the low-concentration brine into the obtained latest mixture to promote the further crystallization and precipitation of the inorganic salt, further integrally filtering and separating the current mixture in sequence, 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 separated in the step (3) is crystallized and precipitated in the cooling process of high-concentration brine and the process of adding 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.
CN202111145444.0A 2021-09-28 2021-09-28 Recycling method and system of water-soluble waste composite salt core for casting Active CN113814349B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111145444.0A CN113814349B (en) 2021-09-28 2021-09-28 Recycling method and system of water-soluble waste composite salt core for casting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111145444.0A CN113814349B (en) 2021-09-28 2021-09-28 Recycling method and system of water-soluble waste composite salt core for casting

Publications (2)

Publication Number Publication Date
CN113814349A CN113814349A (en) 2021-12-21
CN113814349B true CN113814349B (en) 2022-09-20

Family

ID=78915741

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111145444.0A Active CN113814349B (en) 2021-09-28 2021-09-28 Recycling method and system of water-soluble waste composite salt core for casting

Country Status (1)

Country Link
CN (1) CN113814349B (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101565189A (en) * 2009-06-03 2009-10-28 邛崃市鸿丰钾矿肥有限责任公司 Method for preparing sodium chloride and potassium chloride by using brine
CN101928084B (en) * 2009-06-23 2012-06-27 笹仓机械工程有限公司 Treatment method and device of liquid waste containing inorganic salt
CN103624247B (en) * 2013-12-02 2016-01-27 无锡夕阳康科技有限公司 The recovery gear of energy-saving salt core salt
CN104625029B (en) * 2015-01-20 2016-08-17 华中科技大学 A kind of aluminum or Mg alloy castings core cleaning plant and core method for cleaning thereof
CN106670376B (en) * 2016-12-20 2019-11-12 华中科技大学 Low-melting alloy casting high-strength composite salt core material, salt core and preparation method
CN110104862A (en) * 2019-05-21 2019-08-09 中国天辰工程有限公司 The salt-containing organic wastewater generated in a kind of HPPO production is saltoutd method for concentration
CN111940684A (en) * 2020-07-21 2020-11-17 中国第一汽车股份有限公司 Water-soluble composite salt core for high-pressure casting
CN112275996B (en) * 2020-10-29 2022-06-24 盐城仁创砂业科技有限公司 Regeneration method of sand for large steel castings and high-temperature-resistant precoated sand prepared from regenerated sand

Also Published As

Publication number Publication date
CN113814349A (en) 2021-12-21

Similar Documents

Publication Publication Date Title
CN108622943B (en) A method of with useless nickel cobalt (alloy) production LITHIUM BATTERY nickel sulfate and cobaltous sulfate
CN111018221B (en) Method for recycling smelting waste acid wastewater
CN112374521A (en) Process for extracting calcium chloride from waste incineration fly ash
CN107164634B (en) The method that tungsten vanadium component is recycled from cellular useless SCR catalyst for denitrating flue gas
CN102107889A (en) Method for treating ammonium chloride in sodium bicarbonate mother solution at normal temperature
CN103935966A (en) Recycling process of waste sulfuric acid from corrosion of electrode foil
CN106986488B (en) Dyeing and finishing comprehensive wastewater recycling treatment system and process
CN102107890A (en) Treatment method and application of mother liquor in production process of sodium bicarbonate
CN113814349B (en) Recycling method and system of water-soluble waste composite salt core for casting
CN114314625B (en) Method for recovering fluoride salt from complex aluminum electrolyte
CN108439438A (en) The method that nickel cobalt mn sulphate and lithium carbonate are prepared by waste and old ternary battery material
CN104876194A (en) Method for recycling sulfuric acid and sulfate by sulfate-containing dilute sulfuric acid
CN108359813B (en) A kind of energy-saving and environment-friendly salt lake bittern proposes lithium technique
CN112142080A (en) Method for preparing battery-grade lithium carbonate by freezing, circulating and recycling lithium precipitation concentrated mother solution
CN103663505A (en) Method for treating potassium feldspar according to sub-molten salt method to prepare potassium carbonate
CN112794344B (en) Method for purifying sodium sulfate from antibiotic wastewater
US10822241B2 (en) Recycling of nuclear liquid waste with boron control
CN113354179A (en) Recycling treatment method for titanium dioxide waste acid and primary washing waste acid water by sulfuric acid process
CN112250049A (en) Method for separating saline and alkaline byproduct of hydrazine hydrate by urea method
CN103408046A (en) Method for separating sodium and magnesium from laterite-nickel ore smelting primary wastewater
CN1299784A (en) Treatment method of copper containing waste liquid from alkali etching of printed circuit board
CN107262668A (en) A kind of furan resin-sand regenerating used method
CN216808418U (en) Sodium sulfate waste water resourceful treatment system
CN113845262A (en) Waste liquid treatment system and waste liquid treatment method
CN106379869A (en) Technology for extracting sulfuric acid in waste acid liquor from corrosion of electrode foils

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant