CN112551584A - Chromium-containing hazardous waste treatment method - Google Patents
Chromium-containing hazardous waste treatment method Download PDFInfo
- Publication number
- CN112551584A CN112551584A CN202011558481.XA CN202011558481A CN112551584A CN 112551584 A CN112551584 A CN 112551584A CN 202011558481 A CN202011558481 A CN 202011558481A CN 112551584 A CN112551584 A CN 112551584A
- Authority
- CN
- China
- Prior art keywords
- chromium
- filter residue
- water
- product
- mixture
- 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.)
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 48
- 239000011651 chromium Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000002920 hazardous waste Substances 0.000 title claims abstract description 15
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims abstract description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000000047 product Substances 0.000 claims abstract description 40
- 239000000203 mixture Substances 0.000 claims abstract description 34
- 239000010802 sludge Substances 0.000 claims abstract description 30
- 238000001035 drying Methods 0.000 claims abstract description 26
- 238000005406 washing Methods 0.000 claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 21
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 16
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000012043 crude product Substances 0.000 claims abstract description 12
- 230000007935 neutral effect Effects 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 10
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 238000012216 screening Methods 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 12
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 5
- 239000012670 alkaline solution Substances 0.000 claims 2
- 239000000243 solution Substances 0.000 claims 2
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000008187 granular material Substances 0.000 abstract 1
- 238000010298 pulverizing process Methods 0.000 abstract 1
- 239000003513 alkali Substances 0.000 description 7
- 239000002585 base Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 150000001845 chromium compounds Chemical class 0.000 description 3
- VQWFNAGFNGABOH-UHFFFAOYSA-K chromium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Cr+3] VQWFNAGFNGABOH-UHFFFAOYSA-K 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G37/00—Compounds of chromium
- C01G37/02—Oxides or hydrates thereof
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for treating chromium-containing hazardous waste, which relates to the field of hazardous waste treatment and comprises the following steps: washing with water; removing water to obtain filter residue A; adding hydrochloric acid and water into the filter residue A, and uniformly stirring to obtain a mixture B; removing water from the mixture B, and washing with water until the filter residue is neutral to obtain filter residue C; adding hydrofluoric acid and water into the filter residue C to obtain a mixture D; removing water from the mixture D, and washing with water until the filter residue is neutral to obtain filter residue E; drying the filter residue E; pulverizing into granules; roasting to obtain a crude product of chromium sesquioxide; crushing the coarse chromium sesquioxide product again, washing the coarse chromium sesquioxide product by using a strong base solution, and drying in the sun or by baking to obtain a fine chromium sesquioxide product; and grinding and screening the fine chromium sesquioxide product to obtain a chromium sesquioxide powder product. The invention can solve the problems of serious secondary pollution hidden trouble and chromium resource waste of the existing chromium-containing sludge treatment.
Description
Technical Field
The invention relates to the field of hazardous waste treatment, in particular to a method for treating chromium-containing hazardous waste.
Background
The treatment of chromium-containing wastewater by a sewage treatment plant can generate chromium-containing sludge, the chromium-containing sludge contains a large amount of chromium hydroxide and other forms of trivalent chromium compounds, the chromium-containing sludge is a dangerous waste which needs to be treated by a chemical method or a physical method, and otherwise, secondary pollution can be generated.
At present, the treatment of the chromium-containing sludge is generally landfill or incineration, however, the two treatment modes can not eliminate or reduce the hidden trouble of secondary pollution of the chromium-containing sludge.
China is a country with chromium resources lacking, and the chromium in the sludge cannot be recycled by the existing chromium-containing sludge treatment mode, so that the chromium resources are seriously wasted.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for treating chromium-containing hazardous waste, and solves the problems of serious secondary pollution hidden trouble and chromium resource waste in the conventional chromium-containing sludge treatment.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for treating chromium-containing hazardous waste comprises the following steps:
(1) washing the chromium-containing sludge with water to remove impurities in the chromium-containing sludge;
(2) removing water from the chromium-containing sludge washed by the water in the step (1) by using a filter press to obtain filter residue A;
(3) adding hydrochloric acid and water into the filter residue A, and uniformly stirring to obtain a mixture B;
(4) removing water from the mixture B by using a filter press, and washing the mixture B with water for multiple times until the filter residue is neutral to obtain filter residue C;
(5) adding hydrofluoric acid and water into the filter residue C, and uniformly stirring to obtain a mixture D;
(6) removing water from the mixture D by using a filter press, and washing the mixture D with water for multiple times until filter residue is neutral to obtain filter residue E;
(7) drying or baking the filter residue E in the sun;
(8) crushing the filter residue E which is dried in the sun or in the oven into particles;
(9) roasting the crushed granular filter residue E to obtain a chromium sesquioxide crude product;
(10) crushing the coarse chromium sesquioxide product again, washing the coarse chromium sesquioxide product by using a strong base solution, and drying in the sun or by baking to obtain a fine chromium sesquioxide product;
(11) and grinding and screening the fine chromium sesquioxide product to obtain a chromium sesquioxide powder product.
Further, the filter presses used in the step (2), the step (4) and the step (6) are all plate and frame filter presses.
Further, the stirring time in the step (3) is 0.8-0.9 h.
Further, the stirring time in the step (5) is 0.4-0.6 h.
Further, in the step (7), the filter residue E is processed at step 210-230oAnd C, drying for 1.5-2.5 h.
Further, in the step (10), the crude product of chromium oxide washed by strong alkali solution is processed at 210-oAnd C, drying for 1.5-2.5 h.
Further, in the step (10), the alkali solution used is a sodium hydroxide solution.
Further, in the step (11), the ground fine chromium oxide product is sieved by using a vibrating sieve.
The invention has the following beneficial effects:
the method for treating the chromium-containing hazardous waste can convert chromium hydroxide and trivalent chromium compounds in other forms in the chromium-containing sludge into chromium sesquioxide powder products, and removes impurities such as calcium, iron, magnesium, aluminum and the like and silt mixed in the chromium-containing sludge through hydrochloric acid and hydrofluoric acid in the conversion process, thereby ensuring that the purity of the chromium sesquioxide powder products is over 99.6 percent.
In the chromium-containing sludge treatment process, through repeated crushing, drying and roasting, the crushing can increase the surface area of the filter residue E or the chromium oxide crude product, so that the drying and roasting efficiency is higher, and the energy is greatly saved.
Detailed Description
Example 1:
a method for treating chromium-containing hazardous waste comprises the following steps:
(1) washing the chromium-containing sludge with water to remove impurities in the chromium-containing sludge;
(2) removing water from the chromium-containing sludge washed by the water in the step (1) by using a filter press to obtain filter residue A;
(3) adding hydrochloric acid and water into the filter residue A, and uniformly stirring to obtain a mixture B;
(4) removing water from the mixture B by using a filter press, and washing the mixture B with water for multiple times until the filter residue is neutral to obtain filter residue C;
(5) adding hydrofluoric acid and water into the filter residue C, and uniformly stirring to obtain a mixture D;
(6) removing water from the mixture D by using a filter press, and washing the mixture D with water for multiple times until filter residue is neutral to obtain filter residue E;
(7) drying or baking the filter residue E in the sun;
(8) crushing the filter residue E which is dried in the sun or in the oven into particles;
(9) roasting the crushed granular filter residue E to obtain a chromium sesquioxide crude product;
(10) crushing the coarse chromium sesquioxide product again, washing the coarse chromium sesquioxide product by using a strong base solution, and drying in the sun or by baking to obtain a fine chromium sesquioxide product;
(11) and grinding and screening the fine chromium sesquioxide product to obtain a chromium sesquioxide powder product.
The stirring time in the step (3) is 0.8 h.
The stirring time in the step (3) is 0.4 h.
In the step (7), filter residue E is treated at 210oAnd C, drying for 1.5 h.
In the step (10), the crude product of the chromium oxide washed by the strong alkali solution is treated at 210oAnd C, drying for 1.5 h.
In the step (10), the alkali solution is sodium hydroxide solution.
In the step (11), the ground fine chromium oxide product is screened by using a vibrating screen.
The method for treating the chromium-containing hazardous waste can convert chromium hydroxide and trivalent chromium compounds in other forms in the chromium-containing sludge into chromium sesquioxide powder products, and removes impurities such as calcium, iron, magnesium, aluminum and the like and silt mixed in the chromium-containing sludge through hydrochloric acid and hydrofluoric acid in the conversion process, thereby ensuring that the purity of the chromium sesquioxide powder products is over 99.6 percent.
In the chromium-containing sludge treatment process, through repeated crushing, drying and roasting, the crushing can increase the surface area of the filter residue E or the chromium oxide crude product, so that the drying and roasting efficiency is higher, and the energy is greatly saved.
Example 2:
a method for treating chromium-containing hazardous waste comprises the following steps:
(12) washing the chromium-containing sludge with water to remove impurities in the chromium-containing sludge;
(13) removing water from the chromium-containing sludge washed by the water in the step (1) by using a filter press to obtain filter residue A;
(14) adding hydrochloric acid and water into the filter residue A, and uniformly stirring to obtain a mixture B;
(15) removing water from the mixture B by using a filter press, and washing the mixture B with water for multiple times until the filter residue is neutral to obtain filter residue C;
(16) adding hydrofluoric acid and water into the filter residue C, and uniformly stirring to obtain a mixture D;
(17) removing water from the mixture D by using a filter press, and washing the mixture D with water for multiple times until filter residue is neutral to obtain filter residue E;
(18) drying or baking the filter residue E in the sun;
(19) crushing the filter residue E which is dried in the sun or in the oven into particles;
(20) roasting the crushed granular filter residue E to obtain a chromium sesquioxide crude product;
(21) crushing the coarse chromium sesquioxide product again, washing the coarse chromium sesquioxide product by using a strong base solution, and drying in the sun or by baking to obtain a fine chromium sesquioxide product;
(22) and grinding and screening the fine chromium sesquioxide product to obtain a chromium sesquioxide powder product.
The stirring time in the step (3) is 0.85 h.
The stirring time in the step (3) is 0.5 h.
In the step (7), the filter residue E is treated at 220oAnd C, drying for 2 h.
In the step (10), the crude product of the chromium oxide washed by the strong alkali solution is treated at 220oAnd C, drying for 2 h.
In the step (10), the alkali solution is sodium hydroxide solution.
In the step (11), the ground fine chromium oxide product is screened by using a vibrating screen.
Example 3:
a method for treating chromium-containing hazardous waste comprises the following steps:
(23) washing the chromium-containing sludge with water to remove impurities in the chromium-containing sludge;
(24) removing water from the chromium-containing sludge washed by the water in the step (1) by using a filter press to obtain filter residue A;
(25) adding hydrochloric acid and water into the filter residue A, and uniformly stirring to obtain a mixture B;
(26) removing water from the mixture B by using a filter press, and washing the mixture B with water for multiple times until the filter residue is neutral to obtain filter residue C;
(27) adding hydrofluoric acid and water into the filter residue C, and uniformly stirring to obtain a mixture D;
(28) removing water from the mixture D by using a filter press, and washing the mixture D with water for multiple times until filter residue is neutral to obtain filter residue E;
(29) drying or baking the filter residue E in the sun;
(30) crushing the filter residue E which is dried in the sun or in the oven into particles;
(31) roasting the crushed granular filter residue E to obtain a chromium sesquioxide crude product;
(32) crushing the coarse chromium sesquioxide product again, washing the coarse chromium sesquioxide product by using a strong base solution, and drying in the sun or by baking to obtain a fine chromium sesquioxide product;
(33) and grinding and screening the fine chromium sesquioxide product to obtain a chromium sesquioxide powder product.
The stirring time in the step (3) is 0.9 h.
The stirring time in the step (3) is 0.6 h.
In the step (7), filter residue E is added to 230oAnd C, drying for 2.5 hours.
In the step (10), the crude product of the chromium oxide washed by the strong base solution is processed at 230oAnd C, drying for 2.5 hours.
In the step (10), the alkali solution is sodium hydroxide solution.
In the step (11), the ground fine chromium oxide product is screened by using a vibrating screen.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in any way, and those skilled in the art can make various changes and modifications to the equivalent embodiments without departing from the scope of the present invention, and all such changes, modifications, equivalents and improvements that can be made to the above embodiments without departing from the technical spirit of the present invention are within the spirit and principle of the present invention.
Claims (8)
1. The method for treating the chromium-containing hazardous waste is characterized by comprising the following steps of:
washing the chromium-containing sludge with water to remove impurities in the chromium-containing sludge;
removing water from the chromium-containing sludge washed by the water in the step (1) by using a filter press to obtain filter residue A;
adding hydrochloric acid and water into the filter residue A, and uniformly stirring to obtain a mixture B;
removing water from the mixture B by using a filter press, and washing the mixture B with water for multiple times until the filter residue is neutral to obtain filter residue C;
adding hydrofluoric acid and water into the filter residue C, and uniformly stirring to obtain a mixture D;
removing water from the mixture D by using a filter press, and washing the mixture D with water for multiple times until filter residue is neutral to obtain filter residue E;
drying or baking the filter residue E in the sun;
crushing the filter residue E which is dried in the sun or in the oven into particles;
roasting the crushed granular filter residue E to obtain a chromium sesquioxide crude product;
crushing the coarse chromium sesquioxide product again, washing the coarse chromium sesquioxide product by using a strong base solution, and drying in the sun or by baking to obtain a fine chromium sesquioxide product;
and grinding and screening the fine chromium sesquioxide product to obtain a chromium sesquioxide powder product.
2. The method for treating chromium-containing hazardous waste according to claim 1, wherein the filter presses used in step (2), step (4) and step (6) are plate and frame filter presses.
3. The method of claim 1, wherein the stirring time in the step (3) is 0.8-0.9 h.
4. The method of claim 1, wherein the stirring time in the step (5) is 0.4 to 0.6 hours.
5. The method as claimed in claim 1, wherein in step (7), residue E is treated at 210-oAnd C, drying for 1.5-2.5 h.
6. The method as claimed in claim 1, wherein the step (10) is performed at 210-230 ℃ with the crude chromium oxide product washed with the strong alkaline solutionoAnd C, drying for 1.5-2.5 h.
7. The method of claim 1, wherein the strong alkaline solution used in the step (10) is sodium hydroxide solution.
8. The method of claim 1, wherein in the step (11), the ground fine chromium oxide product is sieved by using a vibrating sieve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011558481.XA CN112551584A (en) | 2020-12-25 | 2020-12-25 | Chromium-containing hazardous waste treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011558481.XA CN112551584A (en) | 2020-12-25 | 2020-12-25 | Chromium-containing hazardous waste treatment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112551584A true CN112551584A (en) | 2021-03-26 |
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ID=75032388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011558481.XA Pending CN112551584A (en) | 2020-12-25 | 2020-12-25 | Chromium-containing hazardous waste treatment method |
Country Status (1)
| Country | Link |
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| CN (1) | CN112551584A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699006A (en) * | 2012-05-19 | 2012-10-03 | 唐翔 | Process for processing, recycling and reusing chromic slag and waste water |
| CN106145033A (en) * | 2015-04-08 | 2016-11-23 | 唐翔 | Cr VI technique is removed in chemical chromium slag and metallurgical slag comprehensive utilization |
| CN108275723A (en) * | 2018-01-23 | 2018-07-13 | 山东华升化工科技有限公司 | The method for producing chrome green using chromium-enriched sludge |
-
2020
- 2020-12-25 CN CN202011558481.XA patent/CN112551584A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699006A (en) * | 2012-05-19 | 2012-10-03 | 唐翔 | Process for processing, recycling and reusing chromic slag and waste water |
| CN106145033A (en) * | 2015-04-08 | 2016-11-23 | 唐翔 | Cr VI technique is removed in chemical chromium slag and metallurgical slag comprehensive utilization |
| CN108275723A (en) * | 2018-01-23 | 2018-07-13 | 山东华升化工科技有限公司 | The method for producing chrome green using chromium-enriched sludge |
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Application publication date: 20210326 |