CN113023753A - Treatment process for producing high-purity industrial salt and anhydrous sodium sulphate by using industrial miscellaneous salt - Google Patents
Treatment process for producing high-purity industrial salt and anhydrous sodium sulphate by using industrial miscellaneous salt Download PDFInfo
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- CN113023753A CN113023753A CN202110217186.6A CN202110217186A CN113023753A CN 113023753 A CN113023753 A CN 113023753A CN 202110217186 A CN202110217186 A CN 202110217186A CN 113023753 A CN113023753 A CN 113023753A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/14—Purification
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/18—Dehydration
Abstract
The invention relates to the field of production and manufacturing, in particular to a treatment process for producing high-purity industrial salt and anhydrous sodium sulphate by using industrial miscellaneous salts. A treatment process for producing high-purity industrial salt and anhydrous sodium sulphate by using industrial miscellaneous salts comprises the following steps: the method comprises the following steps: crushing the raw salt by a crusher; step two: and conveying the raw salt particles in the salt storage pool to an ultrasonic salt washing device through a belt conveyor. The invention provides a treatment process for producing high-purity industrial salt and anhydrous sodium sulfate by using industrial miscellaneous salts, which can meet the industrial production salt index of most production units after effectively treating industrial waste salts, solve the problem that each unit stores dangerous waste salts, produce sodium chloride finished products and anhydrous sodium sulfate finished products, and effectively recycle the sodium chloride finished products and the anhydrous sodium sulfate finished products.
Description
Technical Field
The invention relates to the field of production and manufacturing, in particular to a treatment process for producing high-purity industrial salt and anhydrous sodium sulphate by using industrial miscellaneous salts.
Background
The resource recycling of industrial waste salt is always a difficult problem in industrial production, the industrial waste salt has high impurity content and large annual production capacity, so that a large amount of dangerous waste salt is stored in each unit and cannot be effectively recycled, the dangerous waste salt cannot be effectively treated by the traditional process, and the salt index of each production unit is difficult to meet.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
The object of the present invention is to provide a process for producing high purity industrial salt and anhydrous sodium sulphate using industrial miscellaneous salts, which solves at least one of the above technical problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a treatment process for producing high-purity industrial salt and anhydrous sodium sulphate by using industrial miscellaneous salts is characterized by comprising the following steps:
the method comprises the following steps: crushing raw salt by a crusher, and conveying the raw salt particles crushed by the crusher to a salt storage pool;
step two: conveying the raw salt particles in the salt storage pool to an ultrasonic salt washing device through a belt conveyor;
step three: after the raw salt particles enter the ultrasonic salt washing device, starting a stirring device in the ultrasonic salt washing device, keeping the stirring device continuously working, starting an ultrasonic generator of the ultrasonic salt washing device, treating the raw salt particles by the ultrasonic salt washing device to form salt washing mother liquor and salt slurry, overflowing the salt washing mother liquor to a super oxidation pond, and conveying the salt slurry to a first centrifugal machine;
step four: after the salt slurry is conveyed to the first centrifugal machine, the salt slurry is dehydrated by the first centrifugal machine to form a sodium chloride finished product and first centrifugal mother liquor, and the first centrifugal mother liquor flows back to the super oxidation pond;
step five: heating the liquid entering the super oxidation tank to 115-120 ℃, adding medicament sodium hypochlorite and ferrous sulfate, reacting for a certain time, adding sodium carbonate into the super oxidation tank again, and adjusting the pH value of the liquid in the super oxidation tank to 10-12;
step six: conveying the liquid treated by the super oxidation pond to a filter pressing device, treating the liquid by the filter pressing device to form filter pressing clear liquid, conveying the filter pressing clear liquid to a clear liquid pond, conveying the filter pressing clear liquid entering the clear liquid pond to a refrigerating device again, treating the filter pressing clear liquid by the refrigerating device to form freezing supernatant liquid and sodium sulfate, refluxing the freezing supernatant liquid to the ultrasonic salt washing device for recycling, conveying the frozen sodium sulfate to a nitrate settling tank for solid-liquid separation, conveying the sodium sulfate treated by the nitrate settling tank to a second centrifugal machine, performing dehydration treatment by the second centrifugal machine to form sodium sulfate decahydrate and second centrifugal mother liquor, and conveying the second centrifugal mother liquor to the ultrasonic salt washing device for recycling;
step seven: adding hydrochloric acid into the frozen supernatant and the second centrifugal mother liquor, so that the pH values of the frozen supernatant and the second centrifugal mother liquor are adjusted to 6-7;
step eight: and (4) conveying the sodium sulfate decahydrate to a drying device for dehydration to obtain an anhydrous sodium sulfate finished product.
In the first step, the width of the raw salt particles crushed by the crusher is between 0.5mm and 1.0 mm.
In the third step, salt washing mother liquor formed by the treatment of the raw salt particles by the ultrasonic salt washing device overflows to a super oxidation pond from the upper part of the ultrasonic salt washing device through a pipeline, and salt slurry formed by the treatment of the raw salt particles by the ultrasonic salt washing device is conveyed to a first centrifugal machine from the lower part of the ultrasonic salt washing device through a material pump.
In the third step, two first centrifuges are arranged.
And fifthly, heating the liquid entering the super oxidation pond to 115-120 ℃, simultaneously adding 5ml/L of sodium hypochlorite and 5ml/L of ferrous sulfate, reacting for 3-5 hours, and then adding 30% sodium carbonate into the super oxidation pond again to adjust the pH value of the liquid in the super oxidation pond to 10-12.
In the fifth step, two super oxidation ponds are provided;
in the sixth step, three filter pressing devices are provided.
In the sixth step, there are two second centrifuges.
In the sixth step, the pipeline for conveying the second centrifugal mother liquor is connected with the pipeline for conveying the frozen supernatant.
And in the seventh step, one side of the pipeline for conveying the frozen supernatant is provided with a metering pump.
The invention provides a treatment process for producing high-purity industrial salt and anhydrous sodium sulfate by using industrial miscellaneous salts, which can meet the industrial production salt index of most production units after effectively treating industrial waste salts, solve the problem that each unit stores dangerous waste salts, produce sodium chloride finished products and anhydrous sodium sulfate finished products, and effectively recycle the sodium chloride finished products and the anhydrous sodium sulfate finished products.
Drawings
FIG. 1 is a schematic diagram of a partial structure arrangement of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, a process for producing high-purity industrial salt and anhydrous sodium sulfate by using industrial miscellaneous salt comprises the following steps: the method comprises the following steps: crushing raw salt by a crusher 1, and conveying the raw salt particles crushed by the crusher to a salt storage pool 2; step two: conveying the raw salt particles in the salt storage pool to an ultrasonic salt washing device 3 through a belt conveyor; step three: after the raw salt particles enter the ultrasonic salt washing device, starting a stirring device 5 in the ultrasonic salt washing device, keeping the stirring device continuously working, starting an ultrasonic generator 4 of the ultrasonic salt washing device, treating the raw salt particles by the ultrasonic salt washing device to form salt washing mother liquor and salt slurry, overflowing the salt washing mother liquor to a super oxidation pond 7, and conveying the salt slurry to a first centrifugal machine 6; step four: after the salt slurry is conveyed to a first centrifugal machine, the salt slurry is dehydrated by the first centrifugal machine to form a sodium chloride finished product and first centrifugal mother liquor, and the first centrifugal mother liquor flows back to the super oxidation pond; step five: heating the liquid entering the super oxidation pond to 115-120 ℃, adding medicament sodium hypochlorite and ferrous sulfate, reacting for a certain time, adding sodium carbonate into the super oxidation pond again, and adjusting the pH value of the liquid in the super oxidation pond to 10-12; step six: conveying the liquid treated by the super oxidation pond to a filter pressing device 8, treating the liquid by the filter pressing device to form filter pressing clear liquid, conveying the filter pressing clear liquid to a clear liquid pond 9, conveying the filter pressing clear liquid entering the clear liquid pond to a refrigerating device 10 again, treating the filter pressing clear liquid by the refrigerating device to form freezing supernatant liquid and sodium sulfate, refluxing the freezing supernatant liquid to an ultrasonic salt washing device for recycling, conveying the frozen sodium sulfate to a nitrate settling tank 11 for solid-liquid separation, conveying the sodium sulfate treated by the nitrate settling tank to a second centrifugal machine 12, performing dehydration treatment by the second centrifugal machine to form sodium sulfate decahydrate and second centrifugal mother liquor, and conveying the second centrifugal mother liquor to the ultrasonic salt washing device for recycling; step seven: adding hydrochloric acid into the frozen supernatant and the second centrifugal mother liquor, so that the pH values of the frozen supernatant and the second centrifugal mother liquor are adjusted to 6-7; step eight: and (4) conveying the sodium sulfate decahydrate to a drying device 13 for dehydration to obtain an anhydrous sodium sulfate finished product. The invention provides a treatment process for producing high-purity industrial salt and anhydrous sodium sulfate by using industrial miscellaneous salts, which can meet the industrial production salt index of most production units after effectively treating industrial waste salts, solve the problem that each unit stores dangerous waste salts, produce sodium chloride finished products and anhydrous sodium sulfate finished products (anhydrous sodium sulfate), and effectively recycle the sodium chloride finished products and the anhydrous sodium sulfate finished products.
In the first step, the width of the raw salt particles crushed by the crusher is between 0.5mm and 1.0 mm. In the second step, the power of the belt conveyor is 15KW/h, and the hourly material conveying amount of the belt conveyor is 80m3。
In the third step, salt washing mother liquor formed by processing the raw salt particles through the ultrasonic salt washing device overflows to the super oxidation pond from the upper part of the ultrasonic salt washing device through a pipeline, and salt slurry formed by processing the raw salt particles through the ultrasonic salt washing device is conveyed to the centrifugal machine from the lower part of the ultrasonic salt washing device through a material pump. In the third step, the ultrasonic generator is connected with an ultrasonic transducer arranged on the shell of the ultrasonic salt washing device. The electric energy is converted into ultrasonic energy to decompose mud and organic matters in the crystal nucleus. The ultrasonic wave emitted by the ultrasonic generator is 80KW/HZ, and the total power of the ultrasonic generator is 35 KW/h. Is arranged at the superThe stirring device on the acoustic salt washing device is one, and the power of the stirring device is 3 KW/h. In the third step, the number of the first centrifuges is two. One of the two first centrifuges is ready for use. The power of the single first centrifuge was 20KW/h and the throughput per hour of the single first centrifuge was 10m3. In the fourth step, organic matters, heavy metals, toxic and harmful substances and the like in the liquid can be removed and recycled.
And fifthly, heating the liquid entering the super oxidation pond to 115-120 ℃, simultaneously adding 5ml/L of sodium hypochlorite and 5ml/L of ferrous sulfate, reacting for 3-5 hours, and then adding 30% sodium carbonate into the super oxidation pond again to adjust the pH value of the liquid in the super oxidation pond to 10-12. The dosage of the added sodium hypochlorite and ferrous sulfate is controlled according to the liquid amount entering the super oxidation pond.
In the fifth step, the super oxidation pond is two reaction ponds; in the sixth step, three filter pressing devices are provided. The two reaction tanks are convenient for improving the reaction efficiency in the super oxidation tank after the medicament is put into the super oxidation tank. The tank capacity of a single reaction tank is 200m3. The filter pressing device is divided into three devices, and one device can be used for standby. For example, two of the three filter press devices may be connected to two super oxidation ponds, respectively, and another of the three filter press devices is connected to both super oxidation ponds. The two super oxidation ponds can be recycled. The hourly liquid inlet amount of a single filter pressing device is 18m3. In the sixth step, two second centrifuges are adopted. One of the two second centrifuges is ready for use. The power of the single second centrifuge was 20KW/h and the throughput per hour of the single second centrifuge was 10m3. In the sixth step, the pipeline for conveying the second centrifugal mother liquor is connected with the pipeline for conveying the frozen supernatant. The centrifugal mother liquor is merged into the frozen supernatant pipeline for recycling, so that the pipeline arrangement is reduced, and the equipment cost is reduced. And conveying the liquid treated by the super oxidation pond to a filter pressing device through a material pump. The filter-pressed clear liquid is conveyed to a refrigerating device by a high-pressure pump. The number of the high-pressure pumps is two, and the single high-pressure pump has the treatment capacity of 30m per hour3. The number of freezers was two, and the capacity of the freezer per hour for a single freezer was 10T. And conveying the sodium sulfate to a second centrifugal machine through a material pump for dehydration.
In the seventh step, a metering pump 14 is arranged on one side of the pipeline for delivering the frozen supernatant. The input amount of the hydrochloric acid is convenient to control. The hydrochloric acid can be industrial hydrochloric acid with a concentration of 32%. In the eighth step, two drying devices are provided, the power of a single drying device is 100KW/h, and the treatment capacity of the single drying device per hour is 10T.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A treatment process for producing high-purity industrial salt and anhydrous sodium sulphate by using industrial miscellaneous salts is characterized by comprising the following steps:
the method comprises the following steps: crushing raw salt by a crusher, and conveying the raw salt particles crushed by the crusher to a salt storage pool;
step two: conveying the raw salt particles in the salt storage pool to an ultrasonic salt washing device through a belt conveyor;
step three: after the raw salt particles enter the ultrasonic salt washing device, starting a stirring device in the ultrasonic salt washing device, keeping the stirring device continuously working, starting an ultrasonic generator of the ultrasonic salt washing device, treating the raw salt particles by the ultrasonic salt washing device to form salt washing mother liquor and salt slurry, overflowing the salt washing mother liquor to a super oxidation pond, and conveying the salt slurry to a first centrifugal machine;
step four: after the salt slurry is conveyed to the first centrifugal machine, the salt slurry is dehydrated by the first centrifugal machine to form a sodium chloride finished product and first centrifugal mother liquor, and the first centrifugal mother liquor flows back to the super oxidation pond;
step five: heating the liquid entering the super oxidation tank to 115-120 ℃, adding medicament sodium hypochlorite and ferrous sulfate, reacting for a certain time, adding sodium carbonate into the super oxidation tank again, and adjusting the pH value of the liquid in the super oxidation tank to 10-12;
step six: conveying the liquid treated by the super oxidation pond to a filter pressing device, treating the liquid by the filter pressing device to form filter pressing clear liquid, conveying the filter pressing clear liquid to a clear liquid pond, conveying the filter pressing clear liquid entering the clear liquid pond to a refrigerating device again, treating the filter pressing clear liquid by the refrigerating device to form freezing supernatant liquid and sodium sulfate, refluxing the freezing supernatant liquid to the ultrasonic salt washing device for recycling, conveying the frozen sodium sulfate to a nitrate settling tank for solid-liquid separation, conveying the sodium sulfate treated by the nitrate settling tank to a second centrifugal machine, performing dehydration treatment by the second centrifugal machine to form sodium sulfate decahydrate and second centrifugal mother liquor, and conveying the second centrifugal mother liquor to the ultrasonic salt washing device for recycling;
step seven: adding hydrochloric acid into the frozen supernatant and the second centrifugal mother liquor, so that the pH values of the frozen supernatant and the second centrifugal mother liquor are adjusted to 6-7;
step eight: and (4) conveying the sodium sulfate decahydrate to a drying device for dehydration to obtain an anhydrous sodium sulfate finished product.
2. The process for producing high-purity industrial salt and anhydrous sodium sulfate according to claim 1, wherein in the step one, the width of the raw salt particles crushed by the crusher is between 0.5mm and 1.0 mm.
3. The process for producing high-purity industrial salt and anhydrous sodium sulphate by using industrial miscellaneous salt according to claim 1, wherein in the third step, the salt washing mother liquor formed by processing the raw salt particles by the ultrasonic salt washing device overflows to a super oxidation pond from the upper part of the ultrasonic salt washing device through a pipeline, and the salt slurry formed by processing the raw salt particles by the ultrasonic salt washing device is conveyed to the first centrifuge from the lower part of the ultrasonic salt washing device through a material pump.
4. The process of claim 1, wherein the number of the first centrifuges in the third step is two.
5. The process for producing high-purity industrial salt and anhydrous sodium sulphate by using industrial miscellaneous salts, as claimed in claim 1, wherein in the fifth step, after the liquid entering the super oxidation pond is heated to 115-120 ℃, 5ml/L of sodium hypochlorite and 5ml/L of ferrous sulfate are added at the same time, and after the reaction is carried out for 3-5 hours, 30% sodium carbonate is added into the super oxidation pond again to adjust the pH value of the liquid in the super oxidation pond to 10-12.
6. The process for producing high-purity industrial salt and anhydrous sodium sulphate by using industrial miscellaneous salts as claimed in claim 1, wherein in the fifth step, two super oxidation ponds are provided;
in the sixth step, three filter pressing devices are provided.
7. The process of claim 1, wherein in step six, the number of the second centrifuges is two.
8. The process for producing high-purity industrial salt and anhydrous sodium sulfate using industrial miscellaneous salt according to claim 1, wherein in the sixth step, the pipe for transporting the second centrifuged mother liquor is connected to the pipe for transporting the frozen supernatant.
9. The process for producing high-purity industrial salt and anhydrous sodium sulphate by using the industrial miscellaneous salt as claimed in claim 8, wherein in the seventh step, a metering pump is arranged on one side of the pipeline for delivering the frozen supernatant.
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| CN202110217186.6A CN113023753A (en) | 2021-02-26 | 2021-02-26 | Treatment process for producing high-purity industrial salt and anhydrous sodium sulphate by using industrial miscellaneous salt |
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Cited By (1)
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| CN116354369A (en) * | 2023-02-13 | 2023-06-30 | 广东省盐业集团广州有限公司 | Aged sea salt powder eluting pure process |
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