CN105524637B - Method for preparing energy product by using PVC (polyvinyl chloride) plastics and simultaneously harmlessly treating chromium slag - Google Patents
Method for preparing energy product by using PVC (polyvinyl chloride) plastics and simultaneously harmlessly treating chromium slag Download PDFInfo
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- CN105524637B CN105524637B CN201610033746.1A CN201610033746A CN105524637B CN 105524637 B CN105524637 B CN 105524637B CN 201610033746 A CN201610033746 A CN 201610033746A CN 105524637 B CN105524637 B CN 105524637B
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- chromium slag
- cooling water
- solid phase
- fluidized bed
- phase residue
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- 239000011651 chromium Substances 0.000 title claims abstract description 51
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 46
- 239000002893 slag Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229920003023 plastic Polymers 0.000 title claims abstract description 30
- 239000004033 plastic Substances 0.000 title claims abstract description 30
- 229920000915 polyvinyl chloride Polymers 0.000 title 2
- 239000004800 polyvinyl chloride Substances 0.000 title 2
- 239000007790 solid phase Substances 0.000 claims description 30
- 239000000498 cooling water Substances 0.000 claims description 29
- 238000001816 cooling Methods 0.000 claims description 17
- 230000032258 transport Effects 0.000 claims description 12
- 239000012071 phase Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 2
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 abstract description 3
- 238000006555 catalytic reaction Methods 0.000 abstract description 2
- 238000002309 gasification Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 6
- 239000000295 fuel oil Substances 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 231100000419 toxicity Toxicity 0.000 description 4
- 230000001988 toxicity Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 238000000197 pyrolysis Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000002920 hazardous waste Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/07—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of solid raw materials consisting of synthetic polymeric materials, e.g. tyres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B49/00—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated
- C10B49/16—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with moving solid heat-carriers in divided form
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
- Y02P20/143—Feedstock the feedstock being recycled material, e.g. plastics
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Processing Of Solid Wastes (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention relates to a method for preparing an energy product by using PVC plastics and simultaneously harmlessly treating chromium slag, which converts PVC into a high-quality energy product through steam gasification and chromium slag catalysis. Meanwhile, the generated energy product can efficiently reduce hexavalent chromium in the chromium slag, and CaO and other components in the chromium slag fix Cl in PVC.
Description
Technical field
The present invention is a kind of method for preparing energy products innoxious chromium slag simultaneously using PVC plastic, by technology controlling and process,
The Cl in PVC can be fixed while Cr VI efficiently restores in chromium slag, while converting energy products for PVC.
Background technique
Chromium slag is the by-product discharged in bichromate production process.Have because wherein containing water soluble hexavalent chromium greatly
Toxicity will cause different degrees of pollution to underground water source, river or sea area, sternly if the air storage without processing
The growth of weight being detrimental to health with animals and plants.
On the whole, the detoxification (the high Cr VI of toxicity is become trivalent chromium) of chromium slag is divided into wet method detoxifcation at present
With dry detoxified two major classes.But there is respective problem.Wet process is will be by adding reducing agent for Cr in chromium slag6+In liquid-phase reduction solution
The method of poison.But method reagent consumption is big, at high cost, is also difficult at present on a large scale for administering chromium slag.Dry detoxified is both logical
The strong reducing action for crossing high temperature reducing atmosphere makes hexavalent chrome reduction trivalent chromium in chromium slag achieve the purpose that removing toxic substances.Traditional is dry
Method improvement is to make reducing agent with carbon, and 1000 DEG C or so are heated in restoring property atmosphere toxic Cr6+It is reduced into nontoxic Cr6 +, large-scale application has certain economic benefit in the improvement of chromium slag to the method, but pollutes in treatment process with secondary dust,
And cost of investment is high, energy consumption is high.
On the other hand, PVC is a kind of plastics containing Cl, is a kind of white pollution.Its processing method is asked there is also various at present
Topic.Because it contains Cl, therefore burns and be easy to produce dioxin.Pyrolysis made fuel oil, gas are a kind of method more practical at present, Shen
Numbers 2011103660279 the method that a kind of two-step method prepares fuel oil gas using plastics please be disclosed, the first step is volatilized in low temperature
HCl, second step cracking plastics prepare oil gas.Though this method is more practical, due to carrying out two-step method, reaction time is long.Furthermore
In engineering construction, HCl is not easy to volatilize completely, and the remaining Cl in part is easily accessible in the cracking oil gas of second step to right
It is polluted.
Summary of the invention
In view of the deficiencies of the prior art, the present invention is the processing method of disposal of a kind of novel chromium slag, plastics.Pyrolysis processing
Method can be fixed the Cl in PVC for while Cr VI efficiently restores in chromium slag by technology controlling and process, simultaneously will
PVC is converted into high efficient energy sources product.
This process technology scheme are as follows: high temperature chromium slag heating of plastic is utilized, the HCl generated at first is absorbed by CaO in chromium slag,
On chromium slag surface catalysis reaction occurs for the tar generated later with high-temperature steam, generates highly effective fuel oil gas.
Method of the invention specifically includes the following steps:
(1) chromium slag is milled to < 2mm after, be heated to 900-1300 DEG C, after transport to internal heat type rotary kiln；At kiln tail,
High temperature chromium slag is first mixed with PVC plastic, then is mixed with high-temperature steam；Mixture interior heating revolving kiln run 5-60 minutes after,
Reach rotary kiln end；At kiln hood, gas phase energy product flows away from top, and solid phase residue transports to vibration by screw-feeder
Fluidized bed tail portion；
(2) after solid phase residue described in step (1) enters vibrating fluidized bed tail, after operation 2-5 minutes, reach vibration stream
Change head of a bed portion, mixed on head with primary cooling water, solid phase residue and primary cooling water mixed proportion are (1-8): 2, it is then solid
Vibrated fluidized bed is discharged in phase residue, and vibrating fluidized bed tail is transported in generated steam and the reverse flow of solid phase residue, then from
Internal heat type rotary kiln described in step (1) is transported at the row mouthful on tail portion top, and is mixed with plastics and high temperature chromium slag；
(3) gas phase energy product described in step (1), into condensing unit, is carried out after kiln hood discharge using cooling water
Indirect heat exchange processing, non-condensation gas are utilized as energy source gas, and condensate liquid is utilized as energy oil；Cooling water after heat exchange transports to vibration
Fluidized bed head is as the cooling solid phase residue of primary cooling water；
(4) solid phase residue is discharged from vibrated fluidized bed head, into cooling device, sprays into secondary cooling water in the device,
Chromium slag temperature is set to be down to 100 DEG C hereinafter, generated vapor prevents air from entering processing system from internal heat type rotary kiln；
It controls inside air pressure at cooling system row's mouth to be higher than between external atmospheric pressure 0-30kp, air is avoided to enter system；
(5) it is continuously inputted at the cooling water and internal heat type rotary kiln of the cooling solid phase residue in vibrated fluidized bed head
The mass ratio of plastics is controlled at (1-4): 2.
Compared to traditional pyrolysis treating method, this method has following advantage:
1. heating and cracking PVC plastic in rotary kiln using high temperature chromium slag, avoid in complex mixture system to object
Material is heated, and is made easy to operate.
2. mixture temperature can control at 800 DEG C hereinafter, avoiding the volatilization of Cl in plastics and influencing the produced energy
The quality of gas.
3. producing high-quality energy gas while innoxious chromium slag.
4. technique takes the method for the cooling hot-engine sludge of spraying cooling water in two times, steam can be generated simultaneously for the first time,
Steam can be used as the material of catalytic gasification plastics, avoids and additionally prepares steam, energy saving；The same of steam is generated for the second time
When, aggrandizement apparatus air pressure inside prevents outside air from entering system, the trivalent chromium after redox, while avoiding using volume
Outer device control pressure.
Detailed description of the invention
Fig. 1 is process flow chart
It is as follows that example is embodied:
(1) chromium slag is milled to < 2mm after, be heated to 900 DEG C, after transport to internal heat type rotary kiln；At kiln tail, high temperature
Chromium slag is first mixed with PVC plastic, then is mixed with high-temperature steam；Mixture is run after sixty minutes in interior heating revolving kiln, is reached back
Rotary kiln kiln hood；At kiln hood, gas phase energy product flows away from top, and solid phase residue transports to vibrated fluidized bed by screw-feeder
Tail portion；
(2) after solid phase residue described in step (1) enters vibrating fluidized bed tail, after operation 2-5 minutes, reach vibration stream
Change head of a bed portion, mixed on head with primary cooling water, solid phase residue and primary cooling water mixed proportion are 8:2, and subsequent solid phase is residual
Vibrated fluidized bed is discharged in slag, and vibrating fluidized bed tail is transported in generated steam and the reverse flow of solid phase residue, then from tail portion
Internal heat type rotary kiln described in step (1) is transported at the row mouthful on top, and is mixed with plastics and high temperature chromium slag；
(3) gas phase energy product described in step (1), into condensing unit, is carried out after kiln hood discharge using cooling water
Indirect heat exchange processing, non-condensation gas are utilized as energy source gas, and condensate liquid is utilized as energy oil；Cooling water after heat exchange transports to vibration
Fluidized bed head is as the cooling solid phase residue of primary cooling water；
(4) solid phase residue is discharged from vibrated fluidized bed head, into cooling device, sprays into secondary cooling water in the device,
Chromium slag temperature is set to be down to 100 DEG C hereinafter, generated vapor prevents air from entering processing system from internal heat type rotary kiln；
It controls inside air pressure at cooling system row's mouth to be higher than between external atmospheric pressure 0-30kp, air is avoided to enter system；
(5) continuously defeated at the primary cooling water of the cooling solid phase residue in vibrated fluidized bed head with internal heat type rotary kiln
The mass ratio of the plastics entered is controlled in 4:2.
(6) toxicity characteristic leaching procedure is carried out to chromium slag after processing using 5086.2 horizontal vibration method of national standard GB, measures water solubility
Chromium is 0.01mg/L, is significantly less than 5085.3 hazardous waste upper limit 1.5mg/L of national standard GB.Plastics per ton generate the 0.25t energy
Gas, flammable Gas content is above 90%, while plastics per ton generate 0.3t fuel oil.
Example 2:
(1) chromium slag is milled to < 2mm after, be heated to 1300 DEG C, after transport to internal heat type rotary kiln；At kiln tail, high temperature
Chromium slag is first mixed with PVC plastic, then is mixed with high-temperature steam；Mixture reaches back after interior heating revolving kiln is run 30 minutes
Rotary kiln kiln hood；At kiln hood, gas phase energy product flows away from top, and solid phase residue transports to vibrated fluidized bed by screw-feeder
Tail portion；
(2) after solid phase residue described in step (1) enters vibrating fluidized bed tail, after operation 2-5 minutes, reach vibration stream
Change head of a bed portion, mixed on head with primary cooling water, solid phase residue and primary cooling water mixed proportion are 8:3, and subsequent solid phase is residual
Vibrated fluidized bed is discharged in slag, and vibrating fluidized bed tail is transported in generated steam and the reverse flow of solid phase residue, then from tail portion
Internal heat type rotary kiln described in step (1) is transported at the row mouthful on top, and is mixed with plastics and high temperature chromium slag；
(3) gas phase energy product described in step (1), into condensing unit, is carried out after kiln hood discharge using cooling water
Indirect heat exchange processing, non-condensation gas are utilized as energy source gas, and condensate liquid is utilized as energy oil；Cooling water after heat exchange transports to vibration
Fluidized bed head is as the cooling solid phase residue of primary cooling water；
(4) solid phase residue is discharged from vibrated fluidized bed head, into cooling device, sprays into secondary cooling water in the device,
Chromium slag temperature is set to be down to 100 DEG C hereinafter, generated vapor prevents air from entering processing system from internal heat type rotary kiln；
It controls inside air pressure at cooling system row's mouth to be higher than between external atmospheric pressure 0-30kp, air is avoided to enter system；
(5) continuously defeated at the primary cooling water of the cooling solid phase residue in vibrated fluidized bed head with internal heat type rotary kiln
The mass ratio of the plastics entered is controlled in 2:3.
(6) toxicity characteristic leaching procedure is carried out to chromium slag after processing using 5086.2 horizontal vibration method of national standard GB, measures water solubility
Chromium is 0.01mg/L, is significantly less than 5085.3 hazardous waste upper limit 1.5mg/L of national standard GB.Plastics per ton generate the 0.35t energy
Gas, flammable Gas content is above 90%, while plastics per ton generate 0.2t fuel oil.
Claims (2)
1. a kind of method for preparing energy products while innoxious chromium slag using PVC plastic, which is characterized in that including walking as follows
It is rapid: (1) chromium slag is milled to < 2mm after, be heated to 900-1300 DEG C, after transport to internal heat type rotary kiln；At kiln tail, high temperature
Chromium slag is first mixed with PVC plastic, then is mixed with high-temperature steam；Mixture reaches after interior heating revolving kiln is run 5-60 minutes
Rotary kiln end；At kiln hood, gas phase energy product flows away from top, and solid phase residue transports to vibratory liquefaction by screw-feeder
Tailstock portion；(2) after solid phase residue described in step (1) enters vibrating fluidized bed tail, after operation 2-5 minutes, reach vibration stream
Change head of a bed portion, mixed on head with primary cooling water, solid phase residue and primary cooling water mixed proportion are (1-8): 2, it is then solid
Vibrated fluidized bed is discharged in phase residue, and vibrating fluidized bed tail is transported in generated steam and the reverse flow of solid phase residue, then from
Internal heat type rotary kiln described in step (1) is transported at the row mouthful on tail portion top, and is mixed with plastics and high temperature chromium slag；(3)
Gas phase energy product described in step (1), into condensing unit, is carried out at indirect heat exchange after kiln hood discharge using cooling water
Reason, non-condensation gas are utilized as energy source gas, and condensate liquid is utilized as energy oil；Cooling water after heat exchange transports to the vibratory liquefaction head of a bed
Portion is as the cooling solid phase residue of primary cooling water；(4) solid phase residue is discharged from vibrated fluidized bed head, into cooling device,
Secondary cooling water is sprayed into device, and chromium slag temperature is made to be down to 100 DEG C or less；Inside air pressure is higher than outer at control cooling system row's mouth
Between side air pressure 0-30k Pa, air is avoided to enter system.
2. a kind of method for preparing energy products while innoxious chromium slag using PVC plastic according to claim 1, special
Sign is, continuously inputs at the primary cooling water and internal heat type rotary kiln of the cooling solid phase residue in vibrated fluidized bed head
The mass ratio of plastics is controlled at (1-4): 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610033746.1A CN105524637B (en) | 2016-01-19 | 2016-01-19 | Method for preparing energy product by using PVC (polyvinyl chloride) plastics and simultaneously harmlessly treating chromium slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610033746.1A CN105524637B (en) | 2016-01-19 | 2016-01-19 | Method for preparing energy product by using PVC (polyvinyl chloride) plastics and simultaneously harmlessly treating chromium slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105524637A CN105524637A (en) | 2016-04-27 |
| CN105524637B true CN105524637B (en) | 2019-10-22 |
Family
ID=55767170
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610033746.1A Active CN105524637B (en) | 2016-01-19 | 2016-01-19 | Method for preparing energy product by using PVC (polyvinyl chloride) plastics and simultaneously harmlessly treating chromium slag |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85106006A (en) * | 1985-08-07 | 1987-02-25 | 广州市环境保护科学研究所 | Steam method for treating chromium slag |
| JP2006206736A (en) * | 2005-01-28 | 2006-08-10 | Matsushita Electric Ind Co Ltd | Method for gasification of organic compound and equipment for the same |
| CN102755985A (en) * | 2012-07-10 | 2012-10-31 | 辽宁沈宏集团股份有限公司 | Integral leaching detoxication and landfill treatment method of chromium slag |
| CN103232068A (en) * | 2012-05-19 | 2013-08-07 | 唐翔 | Recycling and reutilization process for treating chromium slag and wastewater |
| CN103978015A (en) * | 2014-05-20 | 2014-08-13 | 青岛理工大学 | Method and device for dry-type reduction harmless treatment of chromium slag |
-
2016
- 2016-01-19 CN CN201610033746.1A patent/CN105524637B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85106006A (en) * | 1985-08-07 | 1987-02-25 | 广州市环境保护科学研究所 | Steam method for treating chromium slag |
| JP2006206736A (en) * | 2005-01-28 | 2006-08-10 | Matsushita Electric Ind Co Ltd | Method for gasification of organic compound and equipment for the same |
| CN103232068A (en) * | 2012-05-19 | 2013-08-07 | 唐翔 | Recycling and reutilization process for treating chromium slag and wastewater |
| CN102755985A (en) * | 2012-07-10 | 2012-10-31 | 辽宁沈宏集团股份有限公司 | Integral leaching detoxication and landfill treatment method of chromium slag |
| CN103978015A (en) * | 2014-05-20 | 2014-08-13 | 青岛理工大学 | Method and device for dry-type reduction harmless treatment of chromium slag |
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| Publication number | Publication date |
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| CN105524637A (en) | 2016-04-27 |
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Effective date of registration: 20221128 Address after: 250000 303A, 13, Zhong run Century City, No. 13777, ten road, Lixia District, Ji'nan, Shandong Patentee after: SHANDONG ENVIRONMENTAL PROTECTION INDUSTRY GROUP Co.,Ltd. Address before: 266033 No.777, Jialingjiang East Road, West Coast New District, Qingdao City, Shandong Province Patentee before: Qingdao University of Technology |