CN113735363A - Treatment method of chrome tanning waste liquid - Google Patents
Treatment method of chrome tanning waste liquid Download PDFInfo
- Publication number
- CN113735363A CN113735363A CN202111203251.6A CN202111203251A CN113735363A CN 113735363 A CN113735363 A CN 113735363A CN 202111203251 A CN202111203251 A CN 202111203251A CN 113735363 A CN113735363 A CN 113735363A
- Authority
- CN
- China
- Prior art keywords
- solution
- chrome tanning
- acid
- chromium
- waste liquid
- 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.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/30—Obtaining chromium, molybdenum or tungsten
- C22B34/32—Obtaining chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
- C22B7/007—Wet processes by acid leaching
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a treatment method of chrome tanning waste liquid, and relates to the technical field of light industry and environmental protection. The treatment method provided by the invention comprises the steps of carrying out pre-filtration treatment on the chrome tanning waste liquid, and filtering solid impurities to obtain chrome tanning filtrate; heating the chrome tanning filtrate to 50-80 ℃, continuously stirring, slowly adding a sodium oleate solution into the chrome tanning filtrate until no precipitation reaction product is generated, continuously maintaining the reaction temperature of 50-80 ℃, reacting for 1h, cooling to room temperature, standing for 8-15 h, and filtering the precipitation reaction product to obtain a chrome oleate saponification product; feeding the chromium oleate saponified substance into a sulfuric acid solution to react for 0.5h, and cooling to obtain a layered mixed solution formed by the chromium sulfate solution and oleic acid; and separating the chromium sulfate solution from the layered mixed solution, and then carrying out modification treatment to prepare the chromium tanning agent. According to the method, trivalent chromium ions in the chrome tanning waste liquid are extracted through oleic acid, and the products are fully utilized to perform the circular chromium extraction operation while efficiently separating and extracting chromium, so that the technical effects of improving the treatment efficiency of the chrome tanning waste liquid and improving the chromium recovery efficiency are achieved.
Description
Technical Field
The invention relates to the technical field of light industry and environmental protection, in particular to a treatment method of chrome tanning waste liquid.
Background
The leather can produce a large amount of chrome tanning waste liquid in the chrome tanning process, the chrome tanning waste liquid is directly discharged to the external environment to cause serious environmental pollution, and simultaneously, chromium ions in the chrome tanning waste liquid can be greatly wasted, which is very unfavorable for the development strategy of sustainable development and environmental protection.
At present, the existing treatment method for chrome tanning waste liquid mainly comprises the following steps: direct recycle method, alkali precipitation recovery method, membrane separation method, adsorption method, electrolysis method, biological absorption treatment method, etc. For example, chinese patent No. cn200810122128.x discloses a method for recovering chromium from chrome tanning waste liquid by rapid precipitation based on a caustic soda flake precipitation method, wherein in the treatment process, flocculants such as polyacrylamide are added; chinese patent CN201110321853.1 discloses a method for recycling chrome tanning waste liquid based on an alkaline precipitation method; chinese patent CN202010953082.7 discloses a method for preparing a chrome-containing tanning agent from chrome tanning waste liquid based on divalent metal ion coprecipitation; chinese patent CN201610933780.4 discloses a colloidal liquid foam trivalent chromium ion extractant; chinese patent CN201610780331.0 discloses a method for precipitating chrome tanning waste liquid and recovering chrome resource by using layered sodium silicate.
In the process of implementing the invention, the inventor finds that the following problems exist in the related art:
the existing chrome tanning waste liquid treatment methods such as a precipitation method, an extraction method and the like need to consume a large amount of flocculant and extractant, so that the treatment cost of the chrome tanning waste liquid is higher, and chromium ions are difficult to effectively recover from a treated product.
Disclosure of Invention
The invention mainly aims to provide a treatment method of chrome tanning waste liquid, which is used for solving the technical problems of complex process, high treatment cost and low chrome recovery efficiency of the chrome tanning waste liquid treatment method in the prior art, thereby achieving the technical effects of improving the treatment efficiency of the chrome tanning waste liquid and improving the chrome recovery efficiency. The technical scheme of the invention is as follows:
according to an aspect of the embodiment of the invention, the method for treating the chrome tanning waste liquid is characterized by comprising the following steps:
performing pre-filtration treatment on the chrome tanning waste liquid, and filtering solid impurities to obtain chrome tanning filtrate;
heating the chrome tanning filtrate to 50-80 ℃, continuously stirring, slowly adding a sodium oleate solution into the chrome tanning filtrate until no precipitation reaction product is generated, continuously maintaining the reaction temperature of 50-80 ℃, reacting for 1h, cooling to room temperature, standing for 8-15 h, and filtering the precipitation reaction product to obtain a chrome oleate saponification product;
feeding the chromium oleate soap into a sulfuric acid solution for reaction for 0.5h, cooling and standing to obtain a layered mixed solution formed by a lower chromium sulfate solution and an upper oleic acid, wherein the mass ratio of a sulfuric acid component in the sulfuric acid solution to a sodium oleate component in the sodium oleate solution is 0.18-0.25: 1;
and separating the chromium sulfate solution from the layered mixed solution, and then carrying out modification treatment to prepare the chrome tanning agent.
In a preferred embodiment, the processing method further includes:
and separating the oleic acid from the layered mixed solution, adding a caustic soda flake solution to perform saponification reaction to obtain a sodium oleate solution, wherein the sodium oleate solution is used for the next treatment operation of the chrome tanning waste liquid.
In a preferred embodiment, the sodium oleate solution has a carbon number of less than 18.
In a preferred embodiment, the oleic acid component of the sodium oleate solution comprises at least one of caproic acid, caprylic acid, capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitoleic acid, palmitic acid, nacreoic acid, octadecanoic acid.
In a preferred embodiment, the pre-filtering treatment of the chrome tanning waste liquid comprises:
and (3) sequentially carrying out three-pass filtration treatment on the chrome tanning waste liquid through a coarse grating, a fine grating and a plate-and-frame filter press.
In a preferred embodiment, the mass ratio of the sulfuric acid solution to the sodium oleate solution is 0.18: 1.
Compared with the prior art, the treatment method of the chrome tanning waste liquid provided by the invention has the following advantages:
the invention provides a treatment method of chrome tanning waste liquid, which is characterized in that the chrome tanning waste liquid is subjected to pre-filtration treatment, and solid impurities are filtered to obtain chrome tanning filtrate; heating the chrome tanning filtrate to 50-80 ℃, continuously stirring, slowly adding a sodium oleate solution into the chrome tanning filtrate until no precipitation reaction product is generated, continuously maintaining the reaction temperature of 50-80 ℃ for reaction for 1h, cooling to room temperature, standing for 8-15 h, and filtering the precipitation reaction product to obtain a chrome oleate saponification product; feeding the chromium oleate saponified substance into a sulfuric acid solution to react for 0.5h, cooling and standing to obtain a layered mixed solution formed by a lower chromium sulfate solution and an upper oleic acid layer; and separating the chromium sulfate solution from the layered mixed solution, and then carrying out modification treatment to prepare the chrome tanning agent. According to the method, the trivalent chromium ions in the chrome tanning waste liquid are extracted by adopting the oleic acid, and the product is fully utilized to carry out the circular chromium extraction operation while the chromium is efficiently separated and extracted, so that the technical problems of complex working procedures, high treatment cost and low chromium recovery efficiency of the chrome tanning waste liquid treatment method in the prior art can be solved, and the technical effects of improving the treatment efficiency of the chrome tanning waste liquid and improving the chromium recovery efficiency are achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a flow chart illustrating a method of treating chrome tanning waste liquid according to an exemplary embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flow chart illustrating a method of treating chrome tanning waste liquid according to an exemplary embodiment, as shown in fig. 1, the method comprising:
step 100: and (3) performing pre-filtration treatment on the chrome tanning waste liquid, and filtering solid impurities to obtain chrome tanning filtrate.
In a preferred embodiment, the pre-filtering treatment of the chrome tanning waste liquid comprises:
and (3) sequentially carrying out three-pass filtration treatment on the chrome tanning waste liquid through a coarse grating, a fine grating and a plate-and-frame filter press.
The solid impurities in the chrome tanning waste liquid can be fully filtered by the pre-filtering treatment, and the negative influence on the subsequent chrome extraction process is avoided.
Step 200: heating the chrome tanning filtrate to 50-80 ℃, continuously stirring, slowly adding a sodium oleate solution into the chrome tanning filtrate until no precipitation reaction product is generated, continuously maintaining the reaction temperature of 50-80 ℃, reacting for 1h, cooling to room temperature, standing for 8-15 h, and filtering the precipitation reaction product to obtain the chrome oleate saponification product. It should be noted that, in step 200, the filtrate obtained after the chromium oleate saponification product is filtered out may be subjected to further chromium extraction treatment, and then discharged to a preset municipal pipe network after wastewater treatment.
Step 300: and (3) feeding the chromium oleate soap compound into a sulfuric acid solution to react for 0.5h, cooling and standing to obtain a layered mixed solution formed by a lower chromium sulfate solution and an upper oleic acid, wherein the mass ratio of a sulfuric acid component in the sulfuric acid solution to a sodium oleate component in the sodium oleate solution is 0.18-0.25: 1.
Wherein, the oleic acid is insoluble in water and has a density higher than that of the chromium sulfate solution, so that the oleic acid floats on the upper layer of the chromium sulfate solution in the layered mixed solution. The mass of the sodium oleate component may be calculated in step 200 by recording the mass of the sodium oleate solution added.
Step 400: and separating the chromium sulfate solution from the layered mixed solution, and then carrying out modification treatment to prepare the chrome tanning agent.
In a preferred embodiment, the processing method further includes:
and separating the oleic acid from the layered mixed solution, adding a caustic soda flake solution to perform saponification reaction to obtain a sodium oleate solution, wherein the sodium oleate solution is used for the next treatment operation of the chrome tanning waste liquid.
In a preferred embodiment, the sodium oleate solution has a carbon number of less than 18.
In a preferred embodiment, the oleic acid component of the sodium oleate solution comprises at least one of caproic acid, caprylic acid, capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitoleic acid, palmitic acid, nacreoic acid, octadecanoic acid.
In a preferred embodiment, the mass ratio of the sulfuric acid solution to the sodium oleate solution is 0.4: 1.
Further, the present invention also shows practical treatment examples of a treatment method of chrome tanning waste liquid, as shown in examples 1, 2 and 3.
Example 1
Step 100: and (3) sequentially carrying out three-pass filtration treatment on 50L of chrome tanning waste liquid with the trivalent chromium ion concentration of 2000mg/L through a coarse grating, a fine grating and a plate-and-frame filter press, and filtering solid impurities to obtain chrome tanning filtrate.
Step 200: heating the chrome tanning filtrate to 50 ℃ and continuously stirring, slowly adding a sodium oleate solution into the chrome tanning filtrate until no precipitation reaction product is generated, continuously maintaining the reaction temperature of 50 ℃ for reaction for 1h, cooling to room temperature and standing for 8h, filtering the precipitation reaction product to obtain a chromium oleate saponification product, and recording the mass of sodium oleate in the sodium oleate solution as 430 g.
It should be noted that the clear liquid obtained by filtering is measured to have a total chromium content of 0.18mg/L, which is lower than the requirement that the chromium content in the national standard emission standard of pollutants in water in the leather-making and fur processing industry (GB 30486-2013) is lower than 1.5mg/L, and the clear liquid can be used as general wastewater to be incorporated into comprehensive wastewater treatment equipment of enterprises for subsequent treatment.
In this embodiment, the oleic acid component in the sodium oleate solution includes sodium undecylate, sodium laurate and sodium tridecylate, and the mass ratio of the sodium undecylate to the sodium laurate to the sodium tridecylate is 0.5: 0.3: 0.2.
step 300: and (2) feeding the chromium oleate soap compound into a sulfuric acid solution to react for 0.5h, cooling and standing to obtain a layered mixed solution formed by a lower chromium sulfate solution and an upper oleic acid, wherein the mass of a sulfuric acid component in the sulfuric acid solution is 99g, and the mass ratio of the sulfuric acid component to a sodium oleate component in the sodium oleate solution is 0.23: 1.
Step 400: separating the chromium sulfate solution from the layered mixed solution to obtain a high-concentration chromium sulfate solution with the solid content of 87.4%, and carrying out modification treatment on the chromium sulfate solution to prepare a high-concentration chromium tanning agent solution, so that the chromium tanning agent solution is convenient for subsequent recycling of enterprises.
Wherein, the main effective component of the chrome tanning agent solution comprises basic chrome sulfate.
Step 500: separating the oleic acid from the layered mixed solution, adding caustic soda flake solution to carry out saponification reaction to obtain sodium oleate solution with the solid content of 30%, wherein the solute concentration of the caustic soda flake solution is 80g/L, the mass of caustic soda component in the caustic soda flake solution is 82% of that of sulfuric acid component in the sulfuric acid solution, namely 81.18g, and the sodium oleate solution is used for the next treatment operation of chrome tanning waste liquid.
Example 2
Step 100: and (3) sequentially carrying out three-pass filtration treatment on 80L of chrome tanning waste liquid with the trivalent chromium ion concentration of 2360mg/L through a coarse grating, a fine grating and a plate-and-frame filter press, and filtering solid impurities to obtain chrome tanning filtrate.
Step 200: heating the chrome tanning filtrate to 65 ℃ and continuously stirring, slowly adding a sodium oleate solution into the chrome tanning filtrate until no precipitation reaction product is generated, continuously maintaining the reaction temperature of 65 ℃ for reaction for 1h, cooling to room temperature and standing for 9h, filtering the precipitation reaction product to obtain a chromium oleate saponification product, and recording the addition mass of the sodium oleate solution as 890 g.
It should be noted that the clear liquid obtained by filtering is measured to have a total chromium content of 0.35mg/L, which is lower than the requirement that the chromium content in the national standard emission standard of pollutants in water in the leather-making and fur processing industry (GB 30486-2013) is lower than 1.5mg/L, and the clear liquid can be used as general wastewater to be incorporated into comprehensive wastewater treatment equipment of enterprises for subsequent treatment.
In this embodiment, the oleic acid component in the sodium oleate solution comprises capric acid, sodium undecanoate, cinnamic acid, palmitoleic acid, and the ratio of capric acid, sodium undecanoate, myristic acid, palmitoleic acid is 0.2: 0.3: 0.2: 0.3.
step 300: and (2) feeding the chromium oleate soap compound into a sulfuric acid solution to react for 0.5h, cooling and standing to obtain a layered mixed solution formed by a lower chromium sulfate solution and an upper oleic acid, wherein the mass of a sulfuric acid component in the sulfuric acid solution is 186.9g, and the mass ratio of the sulfuric acid component to a sodium oleate component in the sodium oleate solution is 0.21: 1.
Step 400: separating the chromium sulfate solution from the layered mixed solution to obtain high-concentration chromium sulfate with solid content of 87.4%, and performing modification treatment on the chromium sulfate solution to prepare a high-concentration chromium tanning agent solution, so that the chromium tanning agent solution is convenient for subsequent recycling of enterprises.
Wherein, the main effective component of the chrome tanning agent solution comprises basic chrome sulfate.
Step 500: separating the oleic acid from the layered mixed solution, adding caustic soda flake solution to carry out saponification reaction to obtain sodium oleate solution with the solid content of 31.5%, wherein the solute concentration of the caustic soda flake solution is 80g/L, the mass of the caustic soda flake component in the caustic soda flake solution is 82% of the mass of the sulfuric acid component in the sulfuric acid solution, namely 153.26g, and the sodium oleate solution is used for the next treatment operation of the chrome tanning waste liquid.
Example 3
Step 100: and (3) sequentially carrying out three-pass filtration treatment on 100L of chrome tanning waste liquid with the trivalent chromium ion concentration of 890mg/L through a coarse grating, a fine grating and a plate-and-frame filter press, and filtering solid impurities to obtain chrome tanning filtrate.
Step 200: heating the chrome tanning filtrate to 80 ℃ and continuously stirring, slowly adding a sodium oleate solution into the chrome tanning filtrate until no precipitation reaction product is generated, continuously maintaining the reaction temperature of 80 ℃ for reaction for 1h, cooling to room temperature and standing for 15h, filtering the precipitation reaction product to obtain a chromium oleate saponification product, and recording the addition mass of the sodium oleate solution as 490 g.
It should be noted that the clear liquid obtained by filtering is measured to have a total chromium content of 1.35mg/L by using the national standard "determination of total chromium in water (GB 7466-87)" which is lower than the requirement that the chromium content in the national standard "emission Standard of pollutants for Water in the leather-making and fur processing industry (GB 30486-2013)" is lower than 1.5mg/L, and can be used as general wastewater to be incorporated into comprehensive wastewater treatment equipment of enterprises for subsequent treatment.
In this embodiment, the oleic acid component in the sodium oleate solution includes sodium caproate, sodium caprylate, sodium pentadecanoate, and sodium octadecanoate, and the ratio of the sodium caproate, the sodium caprylate, the sodium pentadecanoate, and the sodium octadecanoate is 0.1: 0.1: 0.35: 0.45.
step 300: and (2) feeding the chromium oleate soap compound into a sulfuric acid solution to react for 0.5h, cooling and standing to obtain a layered mixed solution formed by a lower chromium sulfate solution and an upper oleic acid, wherein the mass of a sulfuric acid component in the sulfuric acid solution is 93g, and the mass ratio of the sulfuric acid component to a sodium oleate component in the sodium oleate solution is 0.19: 1.
Step 400: separating the chromium sulfate solution from the layered mixed solution to obtain a high-concentration chromium sulfate solution with the solid content of 86.8%, and carrying out modification treatment on the chromium sulfate solution to prepare a high-concentration chromium tanning agent solution, so that the chromium tanning agent solution is convenient for subsequent recycling of enterprises.
Wherein, the main effective component of the chrome tanning agent solution comprises basic chrome sulfate.
Step 500: separating the oleic acid from the layered mixed solution, adding caustic soda flake solution to carry out saponification reaction to obtain sodium oleate solution with the solid content of 34%, wherein the solute concentration of the caustic soda flake solution is 80g/L, the mass of caustic soda component in the caustic soda flake solution is 82% of that of sulfuric acid component in the sulfuric acid solution, namely 76.26g, and the sodium oleate solution is used for the next treatment operation of chrome tanning waste liquid.
Obviously, by adopting the method for treating the chrome tanning waste liquid, the trivalent chromium ions in the chrome tanning waste liquid can be efficiently extracted and further converted into the chrome tanning agent with resource utilization value, the discharge of chromium is greatly reduced, and the effect of reducing environmental pollution is obvious.
In summary, according to the treatment method of the chrome tanning waste liquid provided by the invention, the chrome tanning waste liquid is subjected to pre-filtration treatment, and solid impurities are filtered to obtain chrome tanning filtrate; heating the chrome tanning filtrate to 50-80 ℃, continuously stirring, slowly adding a sodium oleate solution into the chrome tanning filtrate until no precipitation reaction product is generated, continuously maintaining the reaction temperature of 50-80 ℃ for reaction for 1h, cooling to room temperature, standing for 8-15 h, and filtering the precipitation reaction product to obtain a chrome oleate saponified product; feeding the chromium oleate saponified substance into a sulfuric acid solution to react for 0.5h, cooling and standing to obtain a layered mixed solution formed by a lower chromium sulfate solution and an upper oleic acid layer; and separating the chromium sulfate solution from the layered mixed solution, and then carrying out modification treatment to prepare the chrome tanning agent. According to the method, the trivalent chromium ions in the chrome tanning waste liquid are extracted by adopting the oleic acid, and the product is fully utilized to carry out the circular chromium extraction operation while the chromium is efficiently separated and extracted, so that the technical problems of complex working procedures, high treatment cost and low chromium recovery efficiency of the chrome tanning waste liquid treatment method in the prior art can be solved, and the technical effects of improving the treatment efficiency of the chrome tanning waste liquid and improving the chromium recovery efficiency are achieved.
While the invention has been described in detail in the foregoing by way of general description, and specific embodiments and experiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof.
Claims (6)
1. A treatment method of chrome tanning waste liquid is characterized by comprising the following steps:
performing pre-filtration treatment on the chrome tanning waste liquid, and filtering solid impurities to obtain chrome tanning filtrate;
heating the chrome tanning filtrate to 50-80 ℃, continuously stirring, slowly adding a sodium oleate solution into the chrome tanning filtrate until no precipitation reaction product is generated, continuously maintaining the reaction temperature of 50-80 ℃, reacting for 1h, cooling to room temperature, standing for 8-15 h, and filtering the precipitation reaction product to obtain a chrome oleate saponification product;
feeding the chromium oleate saponification product into a sulfuric acid solution for reaction for 0.5h, cooling and standing to obtain a layered mixed solution formed by a lower chromium sulfate solution and an upper oleic acid, wherein the mass ratio of a sulfuric acid component in the sulfuric acid solution to a sodium oleate component in the sodium oleate solution is; 0.18-0.25: 1
And separating the chromium sulfate solution from the layered mixed solution, and then carrying out modification treatment to prepare the chrome tanning agent.
2. The processing method according to claim 1, characterized in that it further comprises:
and separating the oleic acid from the layered mixed solution, adding a caustic soda flake solution to perform saponification reaction to obtain a sodium oleate solution, wherein the sodium oleate solution is used for the next treatment operation of the chrome tanning waste liquid.
3. The treatment process of claim 1, wherein the sodium oleate solution has a carbon number of less than 18.
4. The treatment method of claim 1, wherein the oleic acid component of the sodium oleate solution comprises at least one of caproic acid, caprylic acid, capric acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitoleic acid, palmitic acid, margaric acid, stearic acid.
5. A treatment process according to claim 1, wherein the pre-filtration treatment of chrome tanning effluent comprises:
and (3) sequentially carrying out three-pass filtration treatment on the chrome tanning waste liquid through a coarse grating, a fine grating and a plate-and-frame filter press.
6. The process of claim 1, wherein the mass ratio of sulfuric acid component in the sulfuric acid solution to sodium oleate component in the sodium oleate solution is 0.18: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111203251.6A CN113735363A (en) | 2021-10-15 | 2021-10-15 | Treatment method of chrome tanning waste liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111203251.6A CN113735363A (en) | 2021-10-15 | 2021-10-15 | Treatment method of chrome tanning waste liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113735363A true CN113735363A (en) | 2021-12-03 |
Family
ID=78726860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111203251.6A Pending CN113735363A (en) | 2021-10-15 | 2021-10-15 | Treatment method of chrome tanning waste liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113735363A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115465968A (en) * | 2022-09-16 | 2022-12-13 | 嘉兴学院 | Method for separating and recovering chromium in chrome tanning waste liquid |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010045393A1 (en) * | 1992-07-24 | 2001-11-29 | R. Richard Sargent | Method for lowering ph in leather processing solutions |
| CN106277101A (en) * | 2016-08-30 | 2017-01-04 | 陕西科技大学 | A kind of method utilizing lamina sodium silicate precipitation chroming waste liquor and chromium resource to reclaim |
| CN106630008A (en) * | 2016-03-22 | 2017-05-10 | 深圳前海中盛环保科技有限公司 | Novel method for chrome tanning wastewater treatment and chrome recycling |
| CN107879388A (en) * | 2017-11-15 | 2018-04-06 | 山东大学 | A kind of method using heavy metal ion in particle stabilized foam quickly cleaning water |
| CN112010488A (en) * | 2020-09-09 | 2020-12-01 | 佛山经纬纳科环境科技有限公司 | Method for preparing nano particles from heavy metal wastewater |
-
2021
- 2021-10-15 CN CN202111203251.6A patent/CN113735363A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010045393A1 (en) * | 1992-07-24 | 2001-11-29 | R. Richard Sargent | Method for lowering ph in leather processing solutions |
| CN106630008A (en) * | 2016-03-22 | 2017-05-10 | 深圳前海中盛环保科技有限公司 | Novel method for chrome tanning wastewater treatment and chrome recycling |
| CN106277101A (en) * | 2016-08-30 | 2017-01-04 | 陕西科技大学 | A kind of method utilizing lamina sodium silicate precipitation chroming waste liquor and chromium resource to reclaim |
| CN107879388A (en) * | 2017-11-15 | 2018-04-06 | 山东大学 | A kind of method using heavy metal ion in particle stabilized foam quickly cleaning water |
| CN112010488A (en) * | 2020-09-09 | 2020-12-01 | 佛山经纬纳科环境科技有限公司 | Method for preparing nano particles from heavy metal wastewater |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115465968A (en) * | 2022-09-16 | 2022-12-13 | 嘉兴学院 | Method for separating and recovering chromium in chrome tanning waste liquid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102107978B (en) | Method for resource utilization and innocent treatment of etching waste liquid containing copper in circuit board industry | |
| CN101586185B (en) | Method for separating and recycling arsenic and iron from biological oxidation solution of sulfide ore | |
| CN104909507A (en) | Contaminated acid concentrating and recycling method | |
| CN103183459A (en) | Method for removing heavy metal from sludge of sewage treatment works | |
| CN104561592B (en) | Treatment method for nickel-containing electroplating wastewater | |
| CN113735363A (en) | Treatment method of chrome tanning waste liquid | |
| CN114147047B (en) | Resource recovery process for fly ash water-washing slag | |
| CN112158932B (en) | Magnetic zero-valent iron polyaluminum chloride composite flocculant and preparation method and application thereof | |
| CN103498050A (en) | Chromium recovery method in electrolytic manganese chromium wastewater treatment process | |
| CN102583620B (en) | Method for removing heavy metal ions from waste water and solidifying and recycling | |
| CN111547886A (en) | Coal mine wastewater recycling comprehensive treatment system | |
| CN104711428B (en) | Method for preparing and recovering metal in pickling sludge | |
| CN103911513B (en) | Move back the treatment process of tin waste liquid | |
| CN105293774A (en) | Method for increasing recovery rate of precious metals in waste liquid | |
| CN108996752B (en) | Method for recovering low-concentration nickel from nickel extraction waste water | |
| CN115716697A (en) | Preparation method of low-chlorination external-drainage recycled circulating water | |
| CN104310651A (en) | Oily stainless steel cold-rolled wastewater treatment device and method | |
| JP2000167569A (en) | Method and equipment for treating copper-containing acidic waste water | |
| CN204224357U (en) | Oil-containing stainless-steel cold-rolling wastewater treatment equipment | |
| CN213708033U (en) | Lithium manganate effluent disposal system | |
| CN115465968A (en) | Method for separating and recovering chromium in chrome tanning waste liquid | |
| CN217868476U (en) | Zero-discharge treatment system for acidic cold rolling wastewater | |
| CN107604119A (en) | Iron magnesium elements extraction process in barium sulfate production waste liquid | |
| CN204224359U (en) | Steel Plant's oiliness sewage treatment equipment | |
| CN113772856B (en) | Treatment method for recycling high-salt gold smelting wastewater |
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 |