CN112939622A - Method for preparing ceramsite by using chromium-containing sludge - Google Patents
Method for preparing ceramsite by using chromium-containing sludge Download PDFInfo
- Publication number
- CN112939622A CN112939622A CN202110109509.XA CN202110109509A CN112939622A CN 112939622 A CN112939622 A CN 112939622A CN 202110109509 A CN202110109509 A CN 202110109509A CN 112939622 A CN112939622 A CN 112939622A
- Authority
- CN
- China
- Prior art keywords
- chromium
- containing sludge
- powder
- dehydrated
- ceramsite
- 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
- 239000010802 sludge Substances 0.000 title claims abstract description 82
- 239000011651 chromium Substances 0.000 title claims abstract description 75
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000000843 powder Substances 0.000 claims abstract description 39
- 235000019738 Limestone Nutrition 0.000 claims abstract description 13
- 239000006028 limestone Substances 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 239000008187 granular material Substances 0.000 claims abstract description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003245 coal Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000005245 sintering Methods 0.000 claims abstract description 6
- 230000009467 reduction Effects 0.000 claims abstract description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 150000001844 chromium Chemical class 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 230000004580 weight loss Effects 0.000 claims description 6
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 5
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical class O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical class [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 claims description 3
- 239000012298 atmosphere Substances 0.000 claims description 2
- 238000001354 calcination Methods 0.000 claims description 2
- 239000000428 dust Substances 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000005469 granulation Methods 0.000 abstract 1
- 230000003179 granulation Effects 0.000 abstract 1
- 229910001385 heavy metal Inorganic materials 0.000 description 16
- 239000002994 raw material Substances 0.000 description 12
- 239000002910 solid waste Substances 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 238000007711 solidification Methods 0.000 description 8
- 230000008023 solidification Effects 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000012299 nitrogen atmosphere Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- GOLCXWYRSKYTSP-UHFFFAOYSA-N Arsenious Acid Chemical compound O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- -1 shale Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical class [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1321—Waste slurries, e.g. harbour sludge, industrial muds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1328—Waste materials; Refuse; Residues without additional clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/009—Porous or hollow ceramic granular materials, e.g. microballoons
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
-
- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for preparing ceramsite by using chromium-containing sludge. The method comprises the steps of carrying out reduction roasting treatment on chromium-containing sludge, mixing the chromium-containing sludge with coal powder and/or sawdust, dehydrated silica-alumina tailings, limestone and water for granulation, and drying and sintering granules to obtain the ceramsite. The method realizes the resource utilization while solving the pollution to human bodies and environment in the resource process of the hexavalent chromium sludge, and has great economic and environmental benefits.
Description
Technical Field
The invention relates to a harmless treatment and resource utilization method of solid waste, in particular to a method for preparing high-performance ceramsite by utilizing hexavalent chromium-containing sludge and solid waste resources such as tailings and the like, and belongs to the technical field of comprehensive utilization of mining and metallurgy solid waste resources and environmental remediation.
Background
In recent years, with the increasing speed of industrialization, more and more solid waste is generated. If a large amount of solid waste can not be harmlessly disposed in time, serious environmental pollution is caused.
At present, the treatment mode of the solid waste in China mainly comprises incineration, solidification and landfill. However, the traditional disposal method has the problems of large floor area, high energy consumption for treatment, secondary pollution and the like. The resource utilization of solid waste is limited by the factors of not mature technology, high cost and the like. Sludge is a typical solid waste, and its production is rapidly increasing. At present, the harmless treatment mode of the sludge containing heavy metals is mainly solidification landfill, and the resource utilization way of the sludge is still in the starting stage.
The ceramsite is a ceramic lightweight aggregate produced by roasting, and is widely applied to the industries of building materials, gardens and water treatment. The main raw materials for preparing the ceramsite comprise clay, shale, fly ash and the like, but with the continuous acceleration of resource consumption, the traditional production raw materials are in short supply and demand for the production of the ceramsite, and other alternative raw materials are urgently needed to be explored, so that the improvement and optimization of the ceramsite production raw materials and the process are realized. The method for preparing the ceramsite by taking the treated sludge as the raw material can realize the harmless treatment and resource utilization of the sludge, simultaneously solves the problem of limited raw materials for producing the ceramsite, and provides a new way for the consumption of solid wastes and the comprehensive utilization of resources.
Disclosure of Invention
Based on the problems of low resource utilization degree of the chromium-containing sludge and limited production raw materials of the ceramsite in the prior art, the invention aims to provide the method for preparing the high-performance building ceramsite by using the chromium-containing sludge as an addition raw material and matching with solid wastes such as tailings and the like.
The invention also provides a method for preparing ceramsite by using the chromium-containing sludge, which comprises the following steps:
1) respectively drying and dehydrating the chromium-containing sludge and the silicon-aluminum tailings to obtain dehydrated chromium-containing sludge and dehydrated silicon-aluminum tailings;
2) uniformly mixing the dehydrated chromium-containing sludge and a carbonaceous reducing agent, and placing the mixture in a protective atmosphere for reduction roasting to obtain reduced chromium-containing sludge;
3) respectively grinding the reduced chromium-containing sludge and the dehydrated alumino-silicate tailings to obtain reduced chromium-containing sludge powder and dehydrated alumino-silicate tailing powder;
4) mixing and granulating reduced chromium-containing sludge powder, coal powder and/or sawdust, dehydrated silica-alumina tailing powder, limestone powder and water to obtain granules;
5) drying and sintering the granules to obtain the finished product.
As a preferable scheme, the chromium-containing sludge and the silica-alumina tailings are dried and dehydrated until the weight loss rate is balanced to be less than 0.5 percent.
As a preferred scheme, SiO of the silicon-aluminum tailings2Is not less than 50 percent.
Preferably, the mass ratio of the dehydrated chromium-containing sludge to the carbonaceous reducing agent is 1: 0.03-1.0. Under the preferable proportion of the carbonaceous reducing agent, Cr in the chromium-containing sludge can be ensured6+Is fully reduced. Because the chromium-containing sludge contains a large amount of Cr6+，Cr6+Can generate great physiological toxic action on human body, and the chromium-containing sludge is reduced by adopting a high-temperature carbon reduction method, so that Cr in the chromium-containing sludge can be reduced6+Conversion to Cr3+And low-valent chromium such as Cr and the like, so that the toxicity is reduced, and the safety of the process of preparing the ceramsite by recycling can be ensured. The carbonaceous reducing agent is coke, coal powder and the like which are common in the industry.
As a preferred scheme, the reducing roasting conditions are as follows: the temperature is 300-700 ℃, and the time is not less than 0.5 hour. Can ensure Cr in the chromium-containing sludge under the optimized reduction condition6+Is fully reduced.
As a preferable scheme, the granularity of the reduced chromium-containing sludge and the dehydrated alumino-silicate tailings is less than 200 meshes.
As a preferred scheme, the mass percent of the reduced chromium-containing sludge powder, the coal powder and/or the saw dust, the dehydrated silica-alumina tailing powder and the limestone powder is as follows: reducing 5-30% of chromium-containing sludge powder; 3-10% of coal powder and/or sawdust; 30-70% of dehydrated silica-alumina tailing powder; 5-30% of limestone powder. The coal powder and the sawdust play important roles as follows: when the granules are calcined, gas is generated under the high-temperature condition, the expansion range of the granules is expanded, the formation of micropores in the ceramsite is facilitated, and the firing temperature of the ceramsite is reduced. Limestone powder is decomposed in the high-temperature sintering process, mainly plays a role in denuding before decomposition, and activated calcium oxide generated after decomposition mainly plays a role in a flux. According to the preferable scheme, the components of the reduced chromium-containing sludge powder, the dehydrated alumino-silica tailing powder, the limestone powder and the like are controlled within a certain range, so that the components of elements such as silicon, aluminum, iron, calcium, sodium and the like can be effectively adjusted, and the ceramsite with better performance can be obtained through high-temperature solid-phase reaction.
As a preferable scheme, after the granules are dried at the temperature of 110-130 ℃ for 10-30 minutes, the temperature is raised to 1050-1150 ℃ within 2-4 hours, and the granules are calcined for 10-20 minutes. The ceramic particle with better comprehensive performance can be obtained by controlling the temperature rise rate, the sintering temperature and the sintering time to regulate and control the density, the strength and other properties of the ceramic particle.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the ceramsite produced by the method takes the chromium-containing sludge and the silicon-aluminum tailings as raw materials, and can realize safe disposal and resource utilization of dangerous waste and solid waste.
The method can effectively reduce the toxicity of heavy metals in the sludge, realize the solidification and stabilization of the heavy metals in the sludge, and ensure that the solidification rate of the heavy metals in the ceramsite reaches more than 93 percent.
The method solves the problem of limited raw materials for producing the ceramsite, and provides a large amount of raw materials for preparing the ceramsite.
The method can obtain the ceramsite with better performance, and the stacking density of the ceramsite is 758-783 kg/m3The density grade is 800 grade, the cylinder pressure strength is 6.7-8.5 MPa, and the water absorption rate is 6.5-8.9%.
Detailed Description
The following specific examples are intended to further illustrate the present disclosure, but not to limit the scope of the claims.
Example 1
In this example, the tailings from the mineral separation of a certain tin ore field in the municipality of Guangxi province and the electroplating sludge produced by a certain metal product Co., Ltd. in Guangdong province were collected as raw materials, the chromium content (in terms of oxides) in the electroplating sludge was 2.47%, and the chemical composition of the tailings from the mineral separation was shown in Table 1:
TABLE 1 tailings chemistry and content of mineral processing
| Chemical composition | SiO2 | Al2O3 | FeO | CaO | MgO | As2O3 | PbO | Others |
| Content/wt. -%) | 65.12 | 4.57 | 10.03 | 5.65 | 3.21 | 1.04 | 0.25 | 10.13 |
The preparation method of the ceramsite comprises the following steps:
(1) dehydrating the chromium-containing sludge and the tailings, and balancing the weight loss rate to be below 0.5%;
(2) uniformly mixing the dried chromium-containing sludge and activated carbon in a mass ratio of 1:0.05, reducing for 1 hour at 500 ℃ in a nitrogen atmosphere, and collecting the reduced chromium-containing sludge;
(3) grinding the chromium-containing sludge and the tailings until the granularity of the chromium-containing sludge and the tailings is less than 200 meshes;
(4) uniformly mixing the reduced chromium-containing sludge, sawdust, tailings and limestone powder according to the mass ratio of 20:5:65:10, and preparing the mixed material into 1-6 mm ceramsite in a spraying type water-adding stirring mode;
(5) the prepared ceramsite is dried for 20 minutes at 120 ℃, then heated to 1100 ℃ within 3 hours, calcined for 15 minutes at the temperature, and naturally cooled to room temperature to obtain the final ceramsite product.
The obtained ceramsite has a bulk density of 763kg/m3The density grade is 800 grade, the cylinder pressure strength is 8.2MPa, the water absorption rate is 7.3 percent, and the curing rate of heavy metal chromium is 99.99 percent. The heavy metal solidification rate is based on the concentration of leached heavy metal, the test is carried out according to the national standard GB/T5085.3-2007, and an analysis instrument adopts ICP-MS.
Example 2
The preparation method of the ceramsite comprises the following steps:
(1) dehydrating the chromium-containing sludge and the tailings in the embodiment 1, and balancing the weight loss rate to be below 0.5%;
(2) uniformly mixing the dried chromium-containing sludge and activated carbon in a mass ratio of 1:0.05, reducing for 0.5 hour at 600 ℃ in a nitrogen atmosphere, and collecting the reduced chromium-containing sludge;
(3) grinding the chromium-containing sludge and the tailings until the granularity of the chromium-containing sludge and the tailings is less than 200 meshes;
(4) uniformly mixing the reduced chromium-containing sludge, sawdust, tailings and limestone powder according to the mass ratio of 25:5:65:5, and preparing the mixed material into 1-6 mm ceramsite in a spray type water-adding stirring mode;
(5) the prepared ceramsite is dried for 20 minutes at 120 ℃, then heated to 1100 ℃ within 3 hours, calcined for 15 minutes at the temperature, and naturally cooled to room temperature to obtain the final ceramsite product.
The bulk density of the obtained ceramsite is 783kg/m3The density grade is 800 grade, the cylinder pressure strength is 8.5MPa, the water absorption rate is 7.6 percent, and the curing rate of heavy metal chromium is 99.99 percent. The heavy metal solidification rate is based on the concentration of leached heavy metal, the test is carried out according to the national standard GB/T5085.3-2007, and an analysis instrument adopts ICP-MS.
Example 3
The preparation method of the ceramsite comprises the following steps:
(1) dehydrating the chromium-containing sludge and the tailings in the embodiment 1, and balancing the weight loss rate to be below 0.5%;
(2) uniformly mixing the dried chromium-containing sludge and activated carbon in a mass ratio of 1:0, calcining for 0.5 hour at 600 ℃ in a nitrogen atmosphere, and collecting the calcined chromium-containing sludge;
(3) grinding the chromium-containing sludge and the tailings until the granularity of the chromium-containing sludge and the tailings is less than 200 meshes;
(4) uniformly mixing the reduced chromium-containing sludge, sawdust, tailings and limestone powder according to the mass ratio of 25:5:65:5, and preparing the mixed material into 1-6 mm ceramsite in a spray type water-adding stirring mode;
(5) the prepared ceramsite is dried for 20 minutes at 120 ℃, then heated to 1100 ℃ within 3 hours, calcined for 15 minutes at the temperature, and naturally cooled to room temperature to obtain the final ceramsite product.
The obtained ceramsite has a bulk density of 774kg/m3The density grade is 800 grade, the cylinder pressure strength is 8.2MPa, the water absorption rate is 6.5 percent, and the curing rate of heavy metal chromium is 97.89 percent. The heavy metal solidification rate is based on the concentration of leached heavy metal, the test is carried out according to the national standard GB/T5085.3-2007, and an analysis instrument adopts ICP-MS.
Example 4
The preparation method of the ceramsite comprises the following steps:
(1) dehydrating the chromium-containing sludge and the tailings in the embodiment 1, and balancing the weight loss rate to be below 0.5%;
(2) uniformly mixing the dried chromium-containing sludge and activated carbon in a mass ratio of 1:0.05, reducing for 0.5 hour at 600 ℃ in a nitrogen atmosphere, and collecting the reduced chromium-containing sludge;
(3) grinding the chromium-containing sludge and the tailings until the granularity of the chromium-containing sludge and the tailings is less than 200 meshes;
(4) uniformly mixing the reduced chromium-containing sludge, sawdust, tailings and limestone powder according to the mass ratio of 40:5:40:15, and preparing the mixed material into 1-6 mm ceramsite in a spray type water-adding stirring mode;
(5) the prepared ceramsite is dried for 20 minutes at 120 ℃, then heated to 1100 ℃ within 3 hours, calcined for 15 minutes at the temperature, and naturally cooled to room temperature to obtain the final ceramsite product.
The obtained ceramsite has the bulk density of 758kg/m3The density grade is 800 grade, the cylinder pressure strength is 6.7MPa, the water absorption is 8.9 percent, and the curing rate of heavy metal chromium is 93.58 percent. The heavy metal solidification rate is based on the concentration of leached heavy metal, the test is carried out according to the national standard GB/T5085.3-2007, and an analysis instrument adopts ICP-MS.
The foregoing embodiments and description have been presented only to illustrate the principles and preferred embodiments of the invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention as hereinafter claimed.
Claims (8)
1. A method for preparing ceramsite by using chromium-containing sludge is characterized by comprising the following steps: the method comprises the following steps:
1) respectively drying and dehydrating the chromium-containing sludge and the silicon-aluminum tailings to obtain dehydrated chromium-containing sludge and dehydrated silicon-aluminum tailings;
2) uniformly mixing the dehydrated chromium-containing sludge and a carbonaceous reducing agent, and placing the mixture in a protective atmosphere for reduction roasting to obtain reduced chromium-containing sludge;
3) respectively grinding the reduced chromium-containing sludge and the dehydrated alumino-silicate tailings to obtain reduced chromium-containing sludge powder and dehydrated alumino-silicate tailing powder;
4) mixing and granulating reduced chromium-containing sludge powder, coal powder and/or sawdust, dehydrated silica-alumina tailing powder, limestone powder and water to obtain granules;
5) drying and sintering the granules to obtain the finished product.
2. The method for preparing ceramsite by using chromium-containing sludge as defined in claim 1, wherein the method comprises the following steps: drying and dehydrating the chromium-containing sludge and the silicon-aluminum tailings until the weight loss rate is balanced to be below 0.5 percent.
3. The method for preparing ceramsite by using chromium-containing sludge as defined in claim 1, wherein the method comprises the following steps: SiO of the silica-alumina tailings2Is not less than 50 percent.
4. The method for preparing ceramsite by using chromium-containing sludge as defined in claim 1, wherein the method comprises the following steps: the mass ratio of the dehydrated chromium-containing sludge to the carbonaceous reducing agent is 1: 0.03-1.0.
5. The method for preparing ceramsite by using chromium-containing sludge as defined in claim 1, wherein the method comprises the following steps: the reducing roasting conditions are as follows: the temperature is 300-700 ℃, and the time is not less than 0.5 hour.
6. The method for preparing ceramsite by using chromium-containing sludge as defined in claim 1, wherein the method comprises the following steps: the granularity of the reduced chromium-containing sludge and the dehydrated alumino-silico tailings is less than 200 meshes.
7. The method for preparing ceramsite by using chromium-containing sludge as defined in claim 1, wherein the method comprises the following steps: the mass percentages of the reduced chromium-containing sludge powder, the coal powder and/or the saw dust, the dehydrated silicon-aluminum tailing powder and the limestone powder are as follows: reducing 5-30% of chromium-containing sludge powder; 3-10% of coal powder and/or sawdust; 30-70% of dehydrated silica-alumina tailing powder; 5-30% of limestone powder.
8. The method for preparing ceramsite by using chromium-containing sludge as defined in claim 1, wherein the method comprises the following steps: and drying the granules at 110-130 ℃ for 10-30 minutes, then heating to 1050-1150 ℃ within 2-4 hours, and calcining for 10-20 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110109509.XA CN112939622A (en) | 2021-01-25 | 2021-01-25 | Method for preparing ceramsite by using chromium-containing sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110109509.XA CN112939622A (en) | 2021-01-25 | 2021-01-25 | Method for preparing ceramsite by using chromium-containing sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112939622A true CN112939622A (en) | 2021-06-11 |
Family
ID=76237614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110109509.XA Pending CN112939622A (en) | 2021-01-25 | 2021-01-25 | Method for preparing ceramsite by using chromium-containing sludge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112939622A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114349477A (en) * | 2022-01-12 | 2022-04-15 | 湖南国发控股有限公司 | Detoxification formula with high chromium slag amount and process for producing synergistic light aggregate |
| CN114920530A (en) * | 2022-03-28 | 2022-08-19 | 佛山辰石环保材料有限公司 | Sintering-free ceramsite and preparation method thereof |
| CN116396059A (en) * | 2023-04-12 | 2023-07-07 | 常熟理工学院 | Method for preparing ceramsite by using chromium-containing waste residues and printing and dyeing sludge and product thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005224802A (en) * | 2005-05-09 | 2005-08-25 | Dowa Mining Co Ltd | Reduction treatment method for sludge, or the like, containing hexavalent chromium |
| CN102584175A (en) * | 2012-02-06 | 2012-07-18 | 青岛理工大学 | Method for preparing ultra-thin highly-waterproof type ceramsite by taking sediments and chromium slag as raw materials |
| CN102875116A (en) * | 2012-10-17 | 2013-01-16 | 福建微水环保技术有限公司 | Method for preparing chromium-containing sludge ceramsite |
| CN105347837A (en) * | 2015-12-09 | 2016-02-24 | 漳州微水固体废物处置有限公司 | Method for preparing light ceramisite by means of chromium-containing sludge |
| CN106045245A (en) * | 2016-07-11 | 2016-10-26 | 辽宁点石技术开发有限公司 | Method for treating chromium-containing tannery sludge and recycling chromium metal |
| CN107353034A (en) * | 2017-07-27 | 2017-11-17 | 武汉理工大学 | A kind of method for preparing haydite using microwave sintering curing heavy metal chromium |
| CN110655339A (en) * | 2018-06-29 | 2020-01-07 | 湖南万容科技股份有限公司 | Process method for preparing ceramsite by sludge and inorganic solid waste |
| CN111116170A (en) * | 2019-12-24 | 2020-05-08 | 北京大学 | Ceramsite material prepared from serpentine tailings and sludge and preparation method thereof |
-
2021
- 2021-01-25 CN CN202110109509.XA patent/CN112939622A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005224802A (en) * | 2005-05-09 | 2005-08-25 | Dowa Mining Co Ltd | Reduction treatment method for sludge, or the like, containing hexavalent chromium |
| CN102584175A (en) * | 2012-02-06 | 2012-07-18 | 青岛理工大学 | Method for preparing ultra-thin highly-waterproof type ceramsite by taking sediments and chromium slag as raw materials |
| CN102875116A (en) * | 2012-10-17 | 2013-01-16 | 福建微水环保技术有限公司 | Method for preparing chromium-containing sludge ceramsite |
| CN105347837A (en) * | 2015-12-09 | 2016-02-24 | 漳州微水固体废物处置有限公司 | Method for preparing light ceramisite by means of chromium-containing sludge |
| CN106045245A (en) * | 2016-07-11 | 2016-10-26 | 辽宁点石技术开发有限公司 | Method for treating chromium-containing tannery sludge and recycling chromium metal |
| CN107353034A (en) * | 2017-07-27 | 2017-11-17 | 武汉理工大学 | A kind of method for preparing haydite using microwave sintering curing heavy metal chromium |
| CN110655339A (en) * | 2018-06-29 | 2020-01-07 | 湖南万容科技股份有限公司 | Process method for preparing ceramsite by sludge and inorganic solid waste |
| CN111116170A (en) * | 2019-12-24 | 2020-05-08 | 北京大学 | Ceramsite material prepared from serpentine tailings and sludge and preparation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114349477A (en) * | 2022-01-12 | 2022-04-15 | 湖南国发控股有限公司 | Detoxification formula with high chromium slag amount and process for producing synergistic light aggregate |
| CN114349477B (en) * | 2022-01-12 | 2023-08-25 | 湖南国发控股有限公司 | High chromium slag detoxification formula and synergistic lightweight aggregate production process |
| CN114920530A (en) * | 2022-03-28 | 2022-08-19 | 佛山辰石环保材料有限公司 | Sintering-free ceramsite and preparation method thereof |
| CN116396059A (en) * | 2023-04-12 | 2023-07-07 | 常熟理工学院 | Method for preparing ceramsite by using chromium-containing waste residues and printing and dyeing sludge and product thereof |
| CN116396059B (en) * | 2023-04-12 | 2024-02-23 | 常熟理工学院 | Method for preparing ceramsite by using chromium-containing waste residues and printing and dyeing sludge and product thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112939622A (en) | Method for preparing ceramsite by using chromium-containing sludge | |
| CN110282925B (en) | Artificial porous aggregate of carbonized steel slag and preparation method thereof | |
| CN108821621B (en) | Light high-strength ceramsite and preparation method thereof | |
| CN114105610A (en) | Aluminum ash-based porous ceramic material and preparation method thereof | |
| CN113336516A (en) | Cementing material prepared from multi-element solid wastes and cooperative regulation and control method thereof | |
| CN110104979B (en) | Method for preparing coal gangue lightweight aggregate by adopting belt sintering | |
| CN113213891A (en) | Ceramsite preparation method by utilizing waste incineration fly ash and prepared ceramsite | |
| CN107057705B (en) | Heavy metal contaminated soil remediation material, preparation method and application | |
| CN114368961B (en) | Preparation method and new application of iron tailing ceramic filter material | |
| CN111875274A (en) | Method for preparing ceramsite and ceramsite prepared by same | |
| CN112430066A (en) | Light high-strength ceramsite and preparation method and application thereof | |
| CN111285406A (en) | Method for co-recycling alumina red mud and semi-dry desulfurization ash | |
| CN115677248B (en) | Carbon-fixing lightweight aggregate and preparation method thereof | |
| CN112430062A (en) | Preparation method of light high-strength ceramsite, prepared light high-strength ceramsite and application | |
| CN113800941B (en) | Method for preparing ceramsite by utilizing chromium-contaminated soil and ceramsite | |
| CN111233353A (en) | Method for producing general cement clinker by using iron oxide slag to partially replace iron correction raw material | |
| CN111101002A (en) | Production process for magnesium smelting and cement co-production by Pidgeon process | |
| CN114085067A (en) | Method for preparing sintered material by using secondary aluminum ash | |
| CN112028660B (en) | Composition for preparing ultra-light ceramsite, ceramsite and preparation method thereof | |
| CN111302679B (en) | Cement admixture containing vanadium titano-magnetite tailings and preparation method and application thereof | |
| CN110106314B (en) | Chromium slag innocent treatment method and composite material prepared by same | |
| CN116332535A (en) | Method for producing active micro powder by cooperatively treating manganese slag by using fluidized bed furnace | |
| CN113979775B (en) | Method for preparing ceramsite proppant by using secondary aluminum ash | |
| CN114394845B (en) | High-chromium slag amount sintering formula and synergistic foaming ceramic production process | |
| CN111320405B (en) | Solid hazardous waste base mineral admixture and preparation method thereof |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210611 |
|
| RJ01 | Rejection of invention patent application after publication |