CN113560314A - Recycling process for recycling waste salt by semi-dissolution method - Google Patents
Recycling process for recycling waste salt by semi-dissolution method Download PDFInfo
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- CN113560314A CN113560314A CN202110776235.XA CN202110776235A CN113560314A CN 113560314 A CN113560314 A CN 113560314A CN 202110776235 A CN202110776235 A CN 202110776235A CN 113560314 A CN113560314 A CN 113560314A
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- salt
- dissolving
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- byproduct
- recycling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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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
- C01D3/04—Chlorides
- C01D3/08—Preparation by working up natural or industrial salt mixtures or siliceous minerals
Abstract
The invention discloses a process for recycling waste salt by a semi-dissolution method, which comprises the following steps: (1) after the collected industrial waste salt is carbonized/pyrolyzed/incinerated, the organic matters in the industrial waste salt are completely dissolved and separated; (2) the remaining products in the step 1 enter a salt dissolving and pulping system through a secondary conveying system; (3) semi-dissolving the product, completely dissolving the crystalline salt of the low component in the product in the solution, and not dissolving the residual byproduct salt; (4) the dissolved crystal salt is pretreated by a solid-liquid separation system to obtain recoverable salt; (5) and (3) carrying out secondary dissolution on the undissolved byproduct salt, and carrying out pretreatment to obtain the usable byproduct salt. The method adopts a semi-dissolving mode, adds a small amount of circulating process water to dissolve out low-component crystal salt in the mixed salt, and obtains the byproduct refined process salt after the solid salt is subjected to flying removal treatment, wherein most undissolved salt is single byproduct salt (containing fly ash), thereby reducing the utilization of industrial resources.
Description
Technical Field
The invention relates to the technical field of industrial waste salt recovery, in particular to a recycling process for recovering waste salt by a semi-dissolution method.
Background
The waste salt recycling is a leading-edge project and technology of environmental protection at present, and the recycling application which can realize high efficiency and high quality becomes a core problem of environmental protection. The conventional process for recycling industrial waste salt and waste salt at present is to remove organic matters by complete dissolution after the waste salt is treated by carbonization/pyrolysis/incineration and the like; and then the waste salt and the polluted salt are pretreated (impurity ions such as heavy metal, hardness, silicon and the like), and then the waste salt and the polluted salt enter a salt separation refining working section to realize the recycling of byproduct salt, but once the waste salt and the polluted salt have very large single component ratio, the full-dissolving process wastes a large amount of industrial resources.
Disclosure of Invention
The invention aims to solve the technical problem of providing a recycling process for recovering waste salt by a semi-dissolving method, which adopts a semi-dissolving mode, adds a small amount of circulating process water to dissolve low-component crystal salt in mixed salt, and obtains a byproduct refined process salt after most undissolved salt is single byproduct salt (containing fly ash) and the solid salt is subjected to flying removal treatment, thereby reducing the utilization of industrial resources.
In order to solve the technical problem, the invention provides a recycling process for recycling waste salt by a semi-dissolution method, which is characterized by comprising the following steps of: (1) after the collected industrial waste salt is carbonized/pyrolyzed/incinerated, the organic matters in the industrial waste salt are completely dissolved and separated; (2) the product left in the step 1 enters a salt dissolving and pulping system through a secondary conveying system; (3) semi-dissolving the product, completely dissolving the crystalline salt of the low components in the product in the solution, and not dissolving the residual byproduct salt containing the fly ash; (4) the dissolved crystal salt is pretreated by a solid-liquid separation system to obtain recoverable salt; (5) and (3) carrying out secondary dissolution on undissolved byproduct salt, simultaneously carrying out fly ash separation treatment, and carrying out pretreatment to obtain solution salt or evaporating and crystallizing the solution salt into usable byproduct salt.
Further, carrying out harmless resource treatment on the organic matters separated in the step 1, wherein the harmless resource treatment comprises a preheating stage, a pyrolysis stage, a forming stage and a packaging stage.
Further, the pretreatment includes removal of heavy metal ions, silicon ions, hardness ions.
Further, the carbon black obtained after the pretreatment is made into a filter cake, so that the filter cake is convenient to recycle.
Further, the liquid obtained after the pretreatment is placed into a condensed water buffer tank, and the liquid in the condensed water buffer tank can enter the salt dissolving and pulping system again for secondary recycling.
The invention has the beneficial effects that: the method utilizes a semi-dissolving process, adds a small amount of circulating process water to dissolve out low-component crystalline salt in the mixed salt, and obtains the byproduct refined process salt after most undissolved salt is single byproduct salt (containing fly ash) and the solid salt is subjected to flying removal treatment, so that the recovery rate is high, and the treatment capacity and the control difficulty of a later-stage evaporation refining system can be reduced.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1, an embodiment of a recycling process for recycling waste salt by a semi-dissolution method according to the present invention includes the following steps: (1) after the collected industrial waste salt is carbonized/pyrolyzed/incinerated, the organic matters in the industrial waste salt are completely dissolved and separated; (2) the product left in the step 1 enters a salt dissolving and pulping system through a secondary conveying system; (3) semi-dissolving the product, completely dissolving the crystalline salt of the low components in the product in the solution, and not dissolving the residual byproduct salt containing the fly ash; (4) the dissolved crystal salt is pretreated by a solid-liquid separation system to obtain recoverable salt; (5) and (3) carrying out secondary dissolution on undissolved byproduct salt, simultaneously carrying out fly ash separation treatment, and carrying out pretreatment to obtain solution salt or evaporating and crystallizing the solution salt into usable byproduct salt.
The organic matter separated in the step 1 is subjected to harmless resource treatment, which comprises a preheating stage, a pyrolysis stage, a forming stage and a packaging stage, wherein the pyrolysis is a chemical decomposition process for heating the organic matter in an oxygen-free or oxygen-deficient state to enable the organic matter to become gaseous, liquid or solid combustible substances, the gaseous products are generally hydrogen, methane and carbon monoxide, the liquid products are generally methanol, tar, dissolved oil and the like, the solid products are generally coke or carbon black, the solid waste pyrolysis process is a complex chemical process and comprises reactions of macromolecular bond breakage, isomerization, micromolecule polymerization and the like, various smaller molecules are finally produced by reaction, the byproduct waste salt firstly utilizes waste heat generated in the industrial salt forming after pyrolysis to remove moisture in salt through a preheating section and preliminarily preheat the salt, then enters a pyrolysis furnace with a special structure, and the organic matter in the waste salt is subjected to high-temperature pyrolysis at the temperature of 1000- & gt 1200 ℃, the gas phase enters a burner after pyrolysis for full combustion, the combustion heat generated by the burner enters a preheating process to preheat raw salt, water in the raw salt is removed, the raw salt is preliminarily preheated, the pyrolyzed industrial salt enters a special forming machine for forming, the formed salt enters a crushing and packaging process after being cooled, the tail gas enters a washing cooling tower for removing dust and cooling the tail gas after the preheating process, the cooled tail gas enters a photo-oxygen catalytic reactor for decomposing residual organic waste gas, and the decomposed harmless gas is discharged in a high altitude through a chimney.
The pretreatment comprises removing heavy metal ions, silicon ions and hardness ions, and the following method can be adopted, and the content of the heavy metal ions in the brine is firstly detected; secondly, adjusting the pH value of the brine to 7-7.5; after which a Na2S solution was metered in. The concentration of the heavy metal ions is related to pH, and the pH range is adjusted to 7-7.5 according to the types of the heavy metal ions in the waste salt by measuring the content of the heavy metal ions in the waste salt, so that all the heavy metal ions have good precipitation effect.
The carbon black obtained after pretreatment is made into a filter cake to be convenient for recycling, the liquid obtained after pretreatment is placed into a condensed water buffer tank, and the liquid in the condensed water buffer tank can enter the salt dissolving pulping system again for secondary recycling, so that the resources are saved, and the cost is reduced.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (5)
1. A process for recycling waste salt by a semi-dissolution method is characterized by comprising the following steps: (1) after the collected industrial waste salt is carbonized/pyrolyzed/incinerated, the organic matters in the industrial waste salt are completely dissolved and separated; (2) the product left in the step 1 enters a salt dissolving and pulping system through a secondary conveying system; (3) semi-dissolving the product, completely dissolving the crystalline salt of the low components in the product in the solution, and not dissolving the residual byproduct salt containing the fly ash; (4) the dissolved crystal salt is pretreated by a solid-liquid separation system to obtain recoverable salt; (5) and (3) carrying out secondary dissolution on undissolved byproduct salt, simultaneously carrying out fly ash separation treatment, and carrying out pretreatment to obtain solution salt or evaporating and crystallizing the solution salt into usable byproduct salt.
2. The method as claimed in claim 1, wherein the organic material separated in step 1 is subjected to harmless resource treatment, including a preheating stage, a pyrolysis stage, a forming stage and a packaging stage.
3. The process as claimed in claim 1, wherein the pretreatment comprises removing heavy metal ions, silicon ions and hardness ions.
4. The process as claimed in claim 1, wherein the carbon black obtained after the pretreatment is made into a filter cake for recycling.
5. The recycling process of the waste salt recycled by the semi-dissolution method as claimed in claim 1, wherein the liquid obtained after the pretreatment is put into a condensed water buffer tank, and the liquid in the condensed water buffer tank can enter the salt dissolving pulping system again for secondary recycling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110776235.XA CN113560314A (en) | 2021-07-09 | 2021-07-09 | Recycling process for recycling waste salt by semi-dissolution method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110776235.XA CN113560314A (en) | 2021-07-09 | 2021-07-09 | Recycling process for recycling waste salt by semi-dissolution method |
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| Publication Number | Publication Date |
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| CN113560314A true CN113560314A (en) | 2021-10-29 |
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| CN202110776235.XA Pending CN113560314A (en) | 2021-07-09 | 2021-07-09 | Recycling process for recycling waste salt by semi-dissolution method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114308983A (en) * | 2021-12-29 | 2022-04-12 | 安徽今朝环保科技有限公司 | Device and method for cyclone separation reduction of single crystal grain of waste salt |
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2021
- 2021-07-09 CN CN202110776235.XA patent/CN113560314A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114308983A (en) * | 2021-12-29 | 2022-04-12 | 安徽今朝环保科技有限公司 | Device and method for cyclone separation reduction of single crystal grain of waste salt |
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