CN112340960A - Dehydrating agent, preparation method and application thereof, and red mud dehydrating method - Google Patents
Dehydrating agent, preparation method and application thereof, and red mud dehydrating method Download PDFInfo
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- CN112340960A CN112340960A CN202011054027.0A CN202011054027A CN112340960A CN 112340960 A CN112340960 A CN 112340960A CN 202011054027 A CN202011054027 A CN 202011054027A CN 112340960 A CN112340960 A CN 112340960A
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- 239000012024 dehydrating agents Substances 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title abstract description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 76
- 239000000292 calcium oxide Substances 0.000 claims abstract description 47
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 43
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000005997 Calcium carbide Substances 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 23
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims abstract description 23
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 18
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims description 31
- 230000032683 aging Effects 0.000 claims description 21
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 21
- 238000004519 manufacturing process Methods 0.000 claims description 19
- 238000004131 Bayer process Methods 0.000 claims description 14
- 238000010298 pulverizing process Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 239000002440 industrial waste Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 70
- 230000018044 dehydration Effects 0.000 abstract description 43
- 238000006297 dehydration reaction Methods 0.000 abstract description 43
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 8
- 238000001704 evaporation Methods 0.000 abstract description 8
- 230000008020 evaporation Effects 0.000 abstract description 8
- 238000005265 energy consumption Methods 0.000 abstract description 6
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 abstract description 5
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 abstract description 5
- 239000000047 product Substances 0.000 description 45
- 235000012255 calcium oxide Nutrition 0.000 description 42
- 229910014813 CaC2 Inorganic materials 0.000 description 24
- 239000000463 material Substances 0.000 description 16
- 239000002994 raw material Substances 0.000 description 14
- 238000007873 sieving Methods 0.000 description 14
- 230000002431 foraging effect Effects 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- QXDMQSPYEZFLGF-UHFFFAOYSA-L calcium oxalate Chemical compound [Ca+2].[O-]C(=O)C([O-])=O QXDMQSPYEZFLGF-UHFFFAOYSA-L 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- -1 but at the moment Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001599 direct drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
- C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a dehydrating agent, a preparation method and application thereof, and a method for dehydrating red mud, wherein the dehydrating agent comprises the following components: calcium carbide, calcium oxide and magnesium oxide; the particle size of the dehydrating agent is 200 meshes or less. When the dehydrating agent provided by the invention is used for dehydrating red mud, energy consumption is not needed, and a small part of water is removed by utilizing the chemical reaction of each component in the dehydrating agent and water; then most of water in the red mud is removed by evaporation by utilizing the heat released by the chemical reaction and the acetylene gas generated by the reaction of the calcium carbide and the water, so that the method is convenient and rapid, and has high dehydration effect: the red mud with different water contents can be produced by adjusting the addition amount of the dehydrating agent, and the requirements of the red mud on different water contents in subsequent resource utilization are met.
Description
Technical Field
The invention relates to the technical field of resource recycling in the metallurgical industry, in particular to a dehydrating agent, a preparation method and application thereof, and a red mud dehydrating method.
Background
The red mud is residue generated when bauxite is leached by strong alkali in the production process of alumina, and 1.0-1.3 tons of red mud is generated when every 1 ton of alumina is produced. At present, most of red mud is still treated by adopting a land stockpiling method. Red mud piling not only wastes secondary resources and occupies a large amount of land, but also destroys the surrounding environment of the red mud yard and brings serious environmental problems: the red mud contains fluorine, a large amount of rare earth metals and other rare elements, so that the pollution of underground water can be caused; the strong alkali property of the red mud can influence the growth of plants; the surface layer of the piled red mud is dehydrated and weathered, so that the caking property is poor, dust pollution is easy to cause, and the like. Therefore, with the development of the alumina industry, the resource utilization of the red mud is crucial to the sustainable development of the alumina industry.
At present, the main direction of red mud resource utilization is manufacturing building materials, environment-friendly functional materials, metallurgical materials, extracting valuable metals and the like, but the red mud has certain requirements on the water content when the red mud is subjected to the resource utilization, for example, the prior art discloses a method for producing high-strength high-flexibility heat-resistant slag wool and iron by using the red mud, wherein the water content of the red mud is required to be about 10 percent; the prior art discloses a method for preparing red mud pellets, wherein the water content of red mud materials is required to be reduced to below 12 percent before pelletizing; the prior art discloses a method for producing ferrotitanium and byproduct cement clinker from high-iron high-titanium red mud, wherein the moisture content of the red mud is required to be less than 1%. However, the liquid-solid ratio of red mud discharged from an alumina plant is generally 3-4, and through filter pressing and natural airing, the red mud moisture of a red mud yard is generally about 20-25%, and the moisture content of the red mud is far higher than the requirement of the red mud for resource utilization in the subsequent utilization of the red mud, so the red mud dehydration process becomes an indispensable link in the resource utilization process of the red mud.
At present, the moisture content of red mud is mostly reduced to a target value by drying with a dryer, natural drying or drying, and the like, and the prior art discloses a dehydration method for adding calcium oxalate into red mud and performing drying treatment at 400-700 ℃, in particular to a dehydration method for reducing the caking property of red mud by using CO gas generated by drying and thermal decomposition of calcium oxalate, so as to rapidly remove partial water on the surface of the red mud and crystal water in the red mud. However, the method needs to heat the red mud to 400-700 ℃, and the energy consumption is higher; the direct drying by a dryer or natural drying takes longer time, which can affect the period of the subsequent red mud resource utilization.
In order to overcome the defects, the prior art discloses that the red mud and the quicklime powder are stirred and mixed, the calcium oxide in the quicklime powder is utilized to react with the water in the red mud, and a large amount of heat is released simultaneously, so that the moisture in the red mud can be dissipated to achieve the purpose of dehydration. Although calcium oxide reacts with water to generate heat, the red mud has certain viscosity and generates limited heat, so that the moisture in the red mud is difficult to dissipate from the red mud, and the dehydration effect is poor.
Disclosure of Invention
Therefore, the invention aims to overcome the defects of high energy consumption, long time consumption or poor dehydration effect of the red mud dehydration method in the prior art, and provides the dehydrating agent, the preparation method and the application thereof, and the red mud dehydration method.
Therefore, the invention provides the following technical scheme:
a dehydrating agent comprising the following components:
calcium carbide, calcium oxide and magnesium oxide;
the particle size of the dehydrating agent is 200 meshes or less.
Optionally, the mass ratio of the calcium carbide, the calcium oxide and the magnesium oxide is 1 (1-3) to 1-3.
Optionally, the mass ratio of the calcium carbide, the calcium oxide and the magnesium oxide is 1 (1.5-2.5) to 1.5-2.5.
The invention also provides a preparation method of the dehydrating agent, which comprises the steps of crushing calcium carbide, calcium oxide and magnesium oxide until the particle size is below 200 meshes, and then uniformly mixing to obtain the dehydrating agent.
The invention also provides the application of the dehydrating agent or the dehydrating agent prepared by the preparation method of the dehydrating agent in the dehydration of the red mud.
Optionally, the red mud is industrial waste residue generated in at least one method for preparing alumina in Bayer process, sintering process and combination process.
The invention also provides a method for dehydrating the red mud, which comprises the following steps:
crushing the red mud until the particle size is below 10mm, mixing the undersize product with a dehydrating agent, and then aging to obtain dehydrated red mud;
wherein the dehydrating agent has the composition as described above.
Optionally, the mass ratio of the red mud to the dehydrating agent is 100 (3-10).
Optionally, the mass ratio of the red mud to the dehydrating agent is 100 (4-9).
Optionally, the aging time is 8-24 h.
The technical scheme of the invention has the following advantages:
1. the dehydrating agent provided by the invention comprises the following components: calcium carbide, calcium oxide and magnesium oxide; the particle size of the dehydrating agent is 200 meshes or less. When the dehydrating agent is used for dehydrating the red mud, the dehydrating agent can be fully contacted with the red mud by controlling the particle size of the dehydrating agent because the red mud has fine particle size, and the dehydrating effect is improved. The calcium carbide, the calcium oxide and the magnesium oxide in the dehydrating agent react with the moisture in the red mud in sequence, the calcium carbide is the fastest to react, in the process of reacting the calcium carbide with water, additional heat is not needed, the calcium carbide can directly react with the water, the red mud with certain viscosity becomes loose along with the release of acetylene generated by the reaction of the calcium carbide with the water, the contact between the red mud and an air interface is further increased, meanwhile, the calcium carbide, the calcium oxide and the magnesium oxide sequentially react with the water and the reaction process releases heat, the continuous release of the heat can be ensured through the cooperation of the calcium carbide, the calcium oxide and the magnesium oxide, the thermal capillary force of the red mud is increased along with the rise of the temperature of the red mud, the evaporation and heat transfer of the red mud and the air interface can be. When the dehydrating agent provided by the invention is used for dehydrating red mud, energy consumption is not needed, and a small part of water is removed by utilizing the chemical reaction of each component in the dehydrating agent and water; then most of water in the red mud is removed by evaporation by utilizing the heat released by the chemical reaction and the acetylene gas generated by the reaction of the calcium carbide and the water, so that the method is convenient and rapid, and has high dehydration effect: the red mud with different water contents (6.5-15.8%) can be produced by adjusting the addition amount of the dehydrating agent, and the requirements of the red mud on different water contents in subsequent resource utilization are met.
2. The dehydrating agent provided by the invention is prepared by limiting the mass ratio of calcium carbide, calcium oxide and magnesium oxide to 1 (1-3) to 1-3; the dehydrating effect of the dehydrating agent can be further improved.
3. The preparation method of the dehydrating agent provided by the invention is simple, small in occupied area, high in economic benefit, easy to popularize to realize large-scale production, energy-saving and environment-friendly; in addition, when the dehydrating agent prepared by the method is used for dehydrating red mud, energy consumption is not needed, and a small part of water is removed by sequentially and respectively reacting calcium carbide, calcium oxide and magnesium oxide in the dehydrating agent with water; and then most of water in the red mud is removed by evaporation by utilizing the heat continuously released by the reaction and the acetylene gas generated by the reaction of the calcium carbide and the water, so that the evaporation efficiency of the water in the red mud is improved, the method is convenient and quick, and the dehydration effect is good. And the red mud with different water contents (6.5-15.8%) can be produced by adjusting the addition amount of the dehydrating agent, thereby meeting the different water content requirements of the red mud in the subsequent resource utilization. Has important significance for resource utilization of the red mud.
4. The application of the dehydrating agent in red mud dehydration provided by the invention has the advantages that the dehydrating water rate of the red mud can reach 74% by limiting the mass ratio of the red mud to the dehydrating agent and combining the aging time and the specific composition of the dehydrating agent, so that different water content requirements of the red mud in subsequent resource utilization are met, and the resource utilization range of the red mud is wide.
5. The existing method is difficult to further dehydrate the red mud in the red mud yard and has larger energy consumption, and the method for dehydrating the red mud provided by the invention mixes a specific dehydrating agent with the crushed red mud; the red mud and the dehydrating agent are uniformly mixed, the dehydrating agent is favorable for enabling all components in the dehydrating agent to fully react with water in the red mud in sequence to remove part of water in the red mud, and most of water in the red mud is removed through evaporation by utilizing heat continuously released by reaction and gas acetylene generated by the reaction of calcium carbide and water, so that the method is convenient and rapid; and then aging to enrich the capillary channels of the red mud in the water evaporation process and improve the dehydration effect. The method ensures that the water content of the dehydrated red mud is 6.5-15.8%, meets different water content requirements of the red mud in subsequent resource utilization, and has wide resource utilization range of the red mud.
6. The red mud in the red mud yard is easy to agglomerate and has certain viscosity because of containing viscous minerals. The dehydration of the red mud in the red mud yard becomes difficult; according to the method for dehydrating the red mud, firstly, the red mud is crushed to enable the red mud to be in a relatively loose state, then, the crushed red mud is fully mixed with the dehydrating agent, but at the moment, water in the red mud cannot be quickly and completely mixed with calcium oxide and magnesium oxide in the dehydrating agent, so that by limiting the aging time, on one hand, the components in the dehydrating agent are promoted to continuously react with water, and meanwhile, the red mud is kept at a certain temperature, the evaporation of water in the red mud is promoted, and further, the dehydrating efficiency is remarkably improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic process flow diagram of a method for dehydrating red mud according to the present invention.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Example 1
The embodiment provides a red mud dehydration method, which comprises the following specific steps:
CaO, MgO and CaC2Respectively pulverizing, sieving with 200 mesh sieve, and collecting the undersize product according to CaO, MgO, and CaC2Uniformly mixing the components in a mass ratio of 2:2:1 to obtain a dehydrating agent;
red mud transported back from a red mud yard is discharged into a red mud raw material warehouse (red mud generated by alumina production by a Bayer process), then the red mud is crushed and passes through a 10mm sieve, oversize products (unqualified particle sizes) are crushed again, undersize products are conveyed to a feeding area (the water content of the red mud is 25 percent through detection) through a conveyor belt, and a dehydrating agent is conveyed to the feeding area through a vibration feeder; wherein the mass of the red mud in the charging area is 100kg, and the mass of the dehydrating agent is 9 kg; conveying the red mud and the dehydrating agent in the feeding area to a spiral mixer together for uniform mixing, conveying the uniformly mixed material to an aging area through a conveyor belt for aging for 24 hours, and detecting to reduce the water content of the red mud to 6.5%; the dehydration rate was 74%.
Example 2
The embodiment provides a red mud dehydration method, which comprises the following specific steps:
CaO, MgO and CaC2Respectively pulverizing, sieving with 200 mesh sieve, and collecting the undersize product according to CaO, MgO, and CaC2Uniformly mixing the components in a mass ratio of 2:2:1 to obtain a dehydrating agent;
red mud transported back from a red mud yard is discharged into a red mud raw material warehouse (red mud generated by alumina production by a Bayer process), then the red mud is crushed and passes through a 10mm sieve, oversize products (unqualified particle sizes) are crushed again, undersize products are conveyed to a feeding area (the water content of the red mud is detected to be 24 percent) through a conveyor belt, and a dehydrating agent is conveyed to the feeding area through a vibration feeder; wherein the mass of the red mud in the charging area is 100kg, and the mass of the dehydrating agent is 3 kg; conveying the red mud and the dehydrating agent in the feeding area to a spiral mixer together for uniform mixing, conveying the uniformly mixed material to an aging area through a conveyor belt for aging for 12 hours, and detecting to reduce the water content of the red mud to 15.39%; the dehydration rate was 35.88%.
Example 3
The embodiment provides a red mud dehydration method, which comprises the following specific steps:
CaO, MgO and CaC2Respectively pulverizing, sieving with 200 mesh sieve, and collecting the undersize product according to CaO, MgO, and CaC2Uniformly mixing the components in a mass ratio of 2:2:1 to obtain a dehydrating agent;
red mud transported back from a red mud yard is discharged into a red mud raw material warehouse (red mud generated by alumina production by a Bayer process), then the red mud is crushed and passes through a 10mm sieve, oversize products (unqualified particle sizes) are crushed again, undersize products are conveyed to a feeding area (the water content of the red mud is detected to be 24 percent) through a conveyor belt, and a dehydrating agent is conveyed to the feeding area through a vibration feeder; wherein the mass of the red mud in the charging area is 100kg, and the mass of the dehydrating agent is 6 kg; conveying the red mud and the dehydrating agent in the feeding area to a spiral mixer together for uniform mixing, conveying the uniformly mixed material to an aging area through a conveyor belt for aging for 24 hours, and detecting to reduce the water content of the red mud to 8.89%; the dehydration rate was 62.96%.
Example 4
The embodiment provides a red mud dehydration method, which comprises the following specific steps:
CaO, MgO and CaC2Respectively pulverizing, sieving with 200 mesh sieve, and collecting the undersize product according to CaO, MgO, and CaC2The mass ratio of 1.5: 2.5:1, uniformly mixing to obtain a dehydrating agent;
red mud transported back from a red mud yard is discharged into a red mud raw material warehouse (red mud generated by alumina production by a Bayer process), then the red mud is crushed and passes through a 10mm sieve, oversize products (unqualified particle sizes) are crushed again, undersize products are conveyed to a feeding area (the water content of the red mud is detected to be 24 percent) through a conveyor belt, and a dehydrating agent is conveyed to the feeding area through a vibration feeder; wherein the mass of the red mud in the charging area is 100kg, and the mass of the dehydrating agent is 6 kg; and (3) conveying the red mud and the dehydrating agent in the feeding area to a spiral mixer together for uniform mixing, conveying the uniformly mixed material to an aging area through a conveyor belt for aging for 16h, and detecting to reduce the water content of the red mud to 13.5%. The dehydration rate was 43.75%.
Example 5
The embodiment provides a red mud dehydration method, which comprises the following specific steps:
CaO, MgO and CaC2Respectively pulverizing, sieving with 200 mesh sieve, and collecting the undersize product according to CaO, MgO, and CaC2The mass ratio of 2.5: 1.5: 1, uniformly mixing to obtain a dehydrating agent;
red mud transported back from a red mud yard is discharged into a red mud raw material warehouse (red mud generated by alumina production by a Bayer process), then the red mud is crushed and passes through a 10mm sieve, oversize products (unqualified particle sizes) are crushed again, undersize products are conveyed to a feeding area (the water content of the red mud is 25 percent through detection) through a conveyor belt, and a dehydrating agent is conveyed to the feeding area through a vibration feeder; wherein the mass of the red mud in the charging area is 100kg, and the mass of the dehydrating agent is 9 kg; and (3) conveying the red mud and the dehydrating agent in the feeding area to a spiral mixer together for uniform mixing, conveying the uniformly mixed material to an aging area through a conveyor belt for aging for 24 hours, and detecting that the water content of the red mud is reduced to 6.53%. The dehydration rate was 73.88%.
Example 6
The embodiment provides a red mud dehydration method, which comprises the following specific steps:
CaO, MgO and CaC2Respectively pulverizing, sieving with 200 mesh sieve, and collecting the undersize product according to CaO, MgO, and CaC2Uniformly mixing the components in a mass ratio of 3:3:1 to obtain a dehydrating agent;
red mud transported back from a red mud yard is discharged into a red mud raw material warehouse (the red mud generated by alumina production by a sintering method), then the red mud is crushed and passes through a 10mm sieve, oversize products (with unqualified particle sizes) are crushed again, undersize products are conveyed to a feeding area through a conveyor belt (the water content of the red mud is detected to be 22 percent), and a dehydrating agent is conveyed to the feeding area through a vibration feeder; wherein the mass of the red mud in the charging area is 100kg, and the mass of the dehydrating agent is 10 kg; and (3) conveying the red mud and the dehydrating agent in the feeding area to a spiral mixer together for uniform mixing, conveying the uniformly mixed material to an aging area through a conveyor belt for aging for 8 hours, and detecting that the water content of the red mud is reduced to 10.51%. The dehydration rate was 52.23%.
Example 7
The embodiment provides a red mud dehydration method, which comprises the following specific steps:
CaO, MgO and CaC2Respectively pulverizing, sieving with 200 mesh sieve, and collecting the undersize product according to CaO, MgO, and CaC2Uniformly mixing the components in a mass ratio of 1:1:1 to obtain a dehydrating agent;
red mud transported back from a red mud yard is unloaded in a red mud raw material warehouse (red mud generated by producing alumina by a combination method), then the red mud is crushed and passes through a 10mm sieve, oversize products (unqualified particle sizes) are crushed again, undersize products are conveyed to a feeding area (the water content of the red mud is 25 percent through detection) through a conveyor belt, and a dehydrating agent is conveyed to the feeding area through a vibration feeder; wherein the mass of the red mud in the charging area is 100kg, and the mass of the dehydrating agent is 3 kg; and (3) conveying the red mud and the dehydrating agent in the feeding area to a spiral mixer together for uniform mixing, conveying the uniformly mixed material to an aging area through a conveyor belt for aging for 20 hours, and detecting that the water content of the red mud is reduced to 13.61%. The dehydration rate was 45.56%.
Example 8
The embodiment provides a red mud dehydration method, which comprises the following specific steps:
CaO, MgO and CaC2Respectively pulverizing, sieving with 200 mesh sieve, and collecting the undersize product according to CaO, MgO, and CaC2Uniformly mixing the components in a mass ratio of 4:2:1 to obtain a dehydrating agent;
red mud transported back from a red mud yard is discharged into a red mud raw material warehouse (red mud generated by alumina production by a Bayer process), then the red mud is crushed and passes through a 10mm sieve, oversize products (unqualified particle sizes) are crushed again, undersize products are conveyed to a feeding area (the water content of the red mud is detected to be 22 percent) through a conveyor belt, and a dehydrating agent is conveyed to the feeding area through a vibration feeder; wherein the mass of the red mud in the charging area is 100kg, and the mass of the dehydrating agent is 3 kg; and (3) conveying the red mud and the dehydrating agent in the feeding area to a spiral mixer together for uniform mixing, conveying the uniformly mixed material to an aging area through a conveyor belt for aging for 12 hours, and detecting to reduce the water content of the red mud to 15%. The dehydration rate was 31.82%.
Example 9
The embodiment provides a red mud dehydration method, which comprises the following specific steps:
CaO, MgO and CaC2Respectively pulverizingCrushing, sieving with 200 mesh sieve, and collecting the undersize product according to CaO, MgO, and CaC2Uniformly mixing the components in a mass ratio of 2:1:2 to obtain a dehydrating agent;
red mud transported back from a red mud yard is discharged into a red mud raw material warehouse (red mud generated by alumina production by a Bayer process), then the red mud is crushed and passes through a 10mm sieve, oversize products (unqualified particle sizes) are crushed again, undersize products are conveyed to a feeding area (the water content of the red mud is 23 percent through detection) through a conveyor belt, and a dehydrating agent is conveyed to the feeding area through a vibration feeder; wherein the mass of the red mud in the charging area is 100kg, and the mass of the dehydrating agent is 3 kg; and (3) conveying the red mud and the dehydrating agent in the feeding area to a spiral mixer together for uniform mixing, conveying the uniformly mixed material to an aging area through a conveyor belt for aging for 12 hours, and detecting to reduce the water content of the red mud to 15.8%. The dehydration rate was 31.30%.
Example 10
The embodiment provides a red mud dehydration method, which comprises the following specific steps:
CaO, MgO and CaC2Respectively pulverizing, sieving with 200 mesh sieve, and collecting the undersize product according to CaO, MgO, and CaC2Uniformly mixing the components in a mass ratio of 2:2:1 to obtain a dehydrating agent;
red mud transported back from a red mud yard is discharged into a red mud raw material warehouse (red mud generated by alumina production by a Bayer process), then the red mud is crushed and passes through a 10mm sieve, oversize products (unqualified particle sizes) are crushed again, undersize products are conveyed to a feeding area (the water content of the red mud is detected to be 24 percent) through a conveyor belt, and a dehydrating agent is conveyed to the feeding area through a vibration feeder; wherein the mass of the red mud in the charging area is 100kg, and the mass of the dehydrating agent is 3 kg; conveying the red mud and the dehydrating agent in the feeding area to a spiral mixer together for uniform mixing, conveying the uniformly mixed material to an aging area through a conveyor belt for aging for 20 hours, and detecting to reduce the water content of the red mud to 13.3%; the dehydration rate was 44.58%.
Example 11
The embodiment provides a red mud dehydration method, which comprises the following specific steps:
CaO, MgO and CaC2Respectively pulverizing, sieving with 200 mesh sieve, and collecting the undersize product according to CaO, MgO, and CaC2Uniformly mixing the components in a mass ratio of 2:2:1 to obtain a dehydrating agent;
red mud transported back from a red mud yard is discharged into a red mud raw material warehouse (red mud generated by alumina production by a Bayer process), then the red mud is crushed and passes through a 10mm sieve, oversize products (unqualified particle sizes) are crushed again, undersize products are conveyed to a feeding area (the water content of the red mud is detected to be 24 percent) through a conveyor belt, and a dehydrating agent is conveyed to the feeding area through a vibration feeder; wherein the mass of the red mud in the charging area is 100kg, and the mass of the dehydrating agent is 4 kg; the preparation method comprises the following steps of (1); the red mud and the dehydrating agent in the feeding area are conveyed to a spiral mixer together to be uniformly mixed, the uniformly mixed material is conveyed to an aging area through a conveyor belt to be aged for 12 hours, and the moisture content of the red mud is reduced to 15% through detection; the dehydration rate was 37.5%.
Comparative example 1
The comparative example provides a red mud dehydration method, which comprises the following specific steps:
crushing CaO, sieving the crushed CaO with a 200-mesh sieve, and taking undersize products to obtain a dehydrating agent;
red mud transported back from a red mud yard is discharged into a red mud raw material warehouse (red mud generated by alumina production by a Bayer process), then the red mud is crushed and passes through a 10mm sieve, oversize products (unqualified particle sizes) are crushed again, undersize products are conveyed to a feeding area (the water content of the red mud is detected to be 24 percent) through a conveyor belt, and a dehydrating agent is conveyed to the feeding area through a vibration feeder; wherein the mass of the red mud in the charging area is 100kg, and the mass of the dehydrating agent is 3 kg; and (3) conveying the red mud and the dehydrating agent in the feeding area to a spiral mixer together for uniform mixing, conveying the uniformly mixed material to an aging area through a conveyor belt for aging for 12 hours, and detecting that the water content of the red mud is reduced to 17.5%. The dehydration rate was 27.08%.
Comparative example 2
The comparative example provides a red mud dehydration method, which comprises the following specific steps:
respectively crushing CaO and MgO, sieving the crushed CaO and MgO by a 200-mesh sieve, and uniformly mixing undersize products according to the mass ratio of CaO to MgO of 1:1 to obtain a dehydrating agent;
red mud transported back from a red mud yard is discharged into a red mud raw material warehouse (red mud generated by alumina production by a Bayer process), then the red mud is crushed and passes through a 10mm sieve, oversize products (unqualified particle sizes) are crushed again, undersize products are conveyed to a feeding area (the water content of the red mud is detected to be 24 percent) through a conveyor belt, and a dehydrating agent is conveyed to the feeding area through a vibration feeder; wherein the mass of the red mud in the charging area is 100kg, and the mass of the dehydrating agent is 3 kg; and (3) conveying the red mud and the dehydrating agent in the feeding area to a spiral mixer together for uniform mixing, conveying the uniformly mixed material to an aging area through a conveyor belt for aging for 12 hours, and detecting that the water content of the red mud is reduced to 17.5%. The dehydration rate was 27.92%.
Comparative example 3
The comparative example provides a red mud dehydration method, which comprises the following specific steps:
mixing MgO and CaC2Respectively pulverizing, sieving with 200 mesh sieve, and collecting the undersize product according to MgO and CaC2Uniformly mixing the components in a mass ratio of 2:1 to obtain a dehydrating agent;
red mud transported back from a red mud yard is discharged into a red mud raw material warehouse (red mud generated by alumina production by a Bayer process), then the red mud is crushed and passes through a 10mm sieve, oversize products (unqualified particle sizes) are crushed again, undersize products are conveyed to a feeding area (the water content of the red mud is 25 percent through detection) through a conveyor belt, and a dehydrating agent is conveyed to the feeding area through a vibration feeder; wherein the mass of the red mud in the charging area is 100kg, and the mass of the dehydrating agent is 3 kg; and (3) conveying the red mud and the dehydrating agent in the feeding area to a spiral mixer together for uniform mixing, conveying the uniformly mixed material to an aging area through a conveyor belt for aging for 12 hours, and detecting to reduce the water content of the red mud to 18%. The dehydration rate was 28%.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. The dehydrating agent is characterized by comprising the following components:
calcium carbide, calcium oxide and magnesium oxide;
the particle size of the dehydrating agent is 200 meshes or less.
2. The dehydrating agent according to claim 1, wherein the mass ratio of the calcium carbide to the calcium oxide to the magnesium oxide is 1: 1-3: 1-3.
3. The dehydrating agent according to claim 1 or 2, wherein the mass ratio of the calcium carbide to the calcium oxide to the magnesium oxide is 1: 1.5-2.5: 1.5-2.5.
4. The method for producing a dehydrating agent according to any one of claims 1 to 3, wherein the dehydrating agent is obtained by pulverizing calcium carbide, calcium oxide and magnesium oxide to a particle size of 200 mesh or less and then mixing them uniformly.
5. Use of a dehydrating agent prepared by the method for preparing a dehydrating agent according to any one of claims 1 to 3 or according to claim 4 for dehydrating red mud.
6. The use according to claim 5, wherein the red mud is industrial waste residue from at least one of Bayer process, sintering process and combination process for preparing alumina.
7. The method for dehydrating the red mud is characterized by comprising the following steps of:
crushing the red mud until the particle size is below 10mm, mixing the crushed red mud with a dehydrating agent, and then aging to obtain dehydrated red mud;
wherein the dehydrating agent has the composition of the dehydrating agent according to any one of claims 1 to 3.
8. The method for dehydrating red mud according to claim 7, wherein the mass ratio of the red mud to the dehydrating agent is 100: 3-10.
9. The method for dehydrating red mud according to claim 8, wherein the mass ratio of the red mud to the dehydrating agent is 100: 4-9.
10. The method for dewatering red mud according to any one of claims 7-9, characterised in that the ageing time is 8-24 h.
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Citations (4)
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|---|---|---|---|---|
| JPS54155918A (en) * | 1978-05-31 | 1979-12-08 | Denki Kagaku Kogyo Kk | Hot iron desulfurizing agent and manufacture thereof |
| US5242601A (en) * | 1991-06-06 | 1993-09-07 | Alternative Technologies For Waste, Inc. | Sludge treatment with CaO or CaC2 and recovery of CaO therefrom |
| CN103641286A (en) * | 2013-12-09 | 2014-03-19 | 沈阳铝镁设计研究院有限公司 | Sludge stabilizing method |
| CN103663920A (en) * | 2013-10-18 | 2014-03-26 | 广州泰历盟环保科技有限公司 | Ferric salt sludge dehydrating agent and sludge dehydrating method |
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2020
- 2020-09-29 CN CN202011054027.0A patent/CN112340960A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54155918A (en) * | 1978-05-31 | 1979-12-08 | Denki Kagaku Kogyo Kk | Hot iron desulfurizing agent and manufacture thereof |
| US5242601A (en) * | 1991-06-06 | 1993-09-07 | Alternative Technologies For Waste, Inc. | Sludge treatment with CaO or CaC2 and recovery of CaO therefrom |
| CN103663920A (en) * | 2013-10-18 | 2014-03-26 | 广州泰历盟环保科技有限公司 | Ferric salt sludge dehydrating agent and sludge dehydrating method |
| CN103641286A (en) * | 2013-12-09 | 2014-03-19 | 沈阳铝镁设计研究院有限公司 | Sludge stabilizing method |
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Application publication date: 20210209 |