CN108906316B - Method for preparing desulfurizer by using carbide slag - Google Patents
Method for preparing desulfurizer by using carbide slag Download PDFInfo
- Publication number
- CN108906316B CN108906316B CN201810717426.7A CN201810717426A CN108906316B CN 108906316 B CN108906316 B CN 108906316B CN 201810717426 A CN201810717426 A CN 201810717426A CN 108906316 B CN108906316 B CN 108906316B
- Authority
- CN
- China
- Prior art keywords
- coarse particles
- carbide slag
- fine particles
- particles
- separation powder
- 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.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
- B03B9/061—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
The invention provides a method for preparing a desulfurizing agent by using carbide slag, which comprises the following steps: carrying out sorting treatment on the carbide slag in a three-separation powder sorting machine to obtain first coarse particles, first medium coarse particles and first fine particles; sorting the first coarse particles obtained by sorting again to obtain second coarse particles, second coarse particles and second fine particles; and carrying out surface modification on the fine particles obtained by sorting treatment to obtain the desulfurizer. According to the invention, the carbide slag is divided into coarse particles, medium coarse particles and fine particles, the coarse particles are used as a primary product of the silicon iron, the medium coarse particles are used as a modifier of basicity in the preparation process of the polyaluminium chloride, and the fine particles are used as a high-performance desulfurizer through surface modification, so that the resource utilization of the carbide slag is realized; the method has the advantages of simple operation, short flow, no secondary solid waste discharge, effective solving of the pollution problem of the carbide slag and good economic and social benefits.
Description
Technical Field
The invention belongs to the technical field of solid waste resource utilization, and relates to a method for preparing a desulfurizer by using carbide slag.
Background
Carbide slag is a solid waste generated in the process of preparing acetylene by reacting carbide with water, and 1800 ten thousand tons of carbide slag is discharged every year in the polyvinyl chloride (PVC) industry. The carbide slag contains rich calcium resources, has great potential resource recycling value, and the utilization ways mainly comprise building material production, environmental management and common calcium chemical products. The calcium hydroxide mass content in the carbide slag can reach 80-90%, the refined calcium hydroxide can be obtained through separation and purification, calcium oxide is produced through molding and sintering, and the calcium hydroxide can be reused as a raw material for calcium carbide production to form industrial circulation; the calcium product prepared from the carbide slag can be used as a desulfurizer, so that the pollution problem caused by sulfur dioxide is greatly reduced; the carbide slag can also be used for producing cement and is an important building material production raw material.
Due to the demand of production reduction and energy conservation in recent years, the consumption of carbide slag is gradually reduced, and meanwhile, the problems of small application range, complex pretreatment, low additional value and the like generally exist in carbide slag utilization, so that the overall utilization rate is only 15% of the discharge amount, and the great stacking of carbide slag not only occupies a great deal of land, but also causes serious environmental pollution problems.
At present, the method for preparing the desulfurizer by using carbide slag generally needs processes of crushing, drying or adding high-purity calcium oxide ingredients and the like. CN 104437023A discloses a method for producing a calcium hydroxide desulfurizer by using waste carbide slag, which comprises the steps of crushing, drying, blending, grinding, homogenizing and the like, and the desulfurizer is prepared; CN 102886201A discloses a method for preparing a desulfurizing agent for a thermal power plant by using carbide slag, which comprises the steps of crushing, impurity removal, calcination, cooling and sieving the carbide slag raw material to obtain the desulfurizing agent; CN 102658007A discloses a method for producing a passivated calcium oxide desulfurizer by using carbide slag, which comprises the steps of filtering and screening ferrosilicon particles by a vibrating screen, then carrying out plate-and-frame filter pressing, adding a passivator and a reinforcing agent, carrying out extrusion granulation, drying, carrying out high-temperature roasting and the like to prepare the desulfurizer. CN 102266715A discloses a method for producing a desulfurizer by carbide slag, which comprises the steps of removing heavy impurities and large particles by cyclone separation, and then obtaining the liquid desulfurizer by the processes of dust-raising negative pressure filtration separation, drying and pulping. The process method is complex, needs operations such as crushing, drying or high-temperature roasting, and has long integral process, high required cost and often insufficient product purity.
In conclusion, a simpler method is needed to be found for preparing the desulfurizer from the carbide slag, so that the carbide slag is convenient to separate, the production cost of the desulfurizer is lower, and the product purity is high.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for preparing a desulfurizer by using carbide slag, wherein the carbide slag is separated by adopting a three-separation powder separator, and is directly separated according to coarse particles, medium coarse particles and fine particles without crushing and drying.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for preparing a desulfurizing agent by using carbide slag, which comprises the following steps:
(1) carrying out sorting treatment on the carbide slag in a three-separation powder sorting machine to obtain first coarse particles, first medium coarse particles and first fine particles;
(2) returning the first medium coarse particles obtained in the step (1) to the three-separation powder concentrator in the step (1) for sorting again to obtain second coarse particles, second medium coarse particles and second fine particles;
(3) and (3) carrying out surface modification on the first fine particles obtained in the step (1) and the second fine particles obtained in the step (2) to obtain the desulfurizing agent.
In the invention, the carbide slag is sorted firstly to obtain coarse particles, medium coarse particles and fine particles, the particles with different particle sizes are separated thoroughly, the particles have different purposes and are convenient to use respectively, and the fine particles are modified to obtain the desulfurizer. The method has the advantages of simple process, short flow, no secondary solid waste discharge, realization of efficient reutilization of the carbide slag waste, and good economic and social values.
In the invention, "first" and "second" before coarse particles, medium coarse particles and fine particles are not limited to particles, but are convenient to distinguish the particles after two times of separation.
The following technical solutions are preferred but not limited to the technical solutions provided by the present invention, and the technical objects and advantages of the present invention can be better achieved and realized by the following technical solutions.
As a preferable technical scheme of the invention, the carbide slag in the step (1) is produced by a dry acetylene production process.
In the prior art, acetylene production mainly comprises a dry process and a wet process, wherein the dry process is used for obtaining carbide slag solid which is suitable for sorting treatment in the invention.
Preferably, the carbide slag in step (1) is treated in an amount of 10-200 t/h, such as 10t/h, 30t/h, 50t/h, 80t/h, 100t/h, 120t/h, 150t/h, 180t/h or 200t/h, but not limited to the recited values, and other values not recited in the range of values are also applicable.
As a preferable technical scheme of the invention, a cyclone and a dust collector are connected in parallel at a fine particle outlet of the three-separation powder concentrator in the step (1) and the step (2).
According to the device, the three-separation powder concentrator can divide the material into three, so that the effective separation of particles with different particle sizes in the carbide slag is realized, and the device is simple in configuration, low in cost and remarkable in powder concentration effect. The cyclone cylinder is arranged at the fine particle outlet of the three-separation powder concentrator, so that fine particles can be effectively collected, meanwhile, the dust collector is arranged in parallel with the cyclone cylinder due to the fact that carbide slag dust with smaller particle size is lighter in weight and is easy to lose due to loss in the particle separation process, dust pollution is avoided, and further modification treatment with the fine particles is facilitated.
Preferably, a dust collection bag is connected to a medium coarse particle outlet of the three-separation powder concentrator in the step (1) and the step (2).
Preferably, the coarse particle outlet of the three separation powder concentrator in the step (1) and the step (2) is connected with a boiling fluidized bed.
In the invention, the powder falling gap between the powder disc and the inner wall can be controlled by controlling the rotation speed of the impeller in the three-separation powder concentrator, so that the separation particle size of coarse particles can be changed; and the separation particle size of the fine particles is adjusted by controlling the air inlet amount of the three-separation powder concentrator. The coarse particle outlet of the three-separation powder concentrator is connected with a boiling fluidized bed, so that fine particles attached to the coarse particles can be separated and recycled, the separation efficiency of the carbide slag is improved, and meanwhile, the follow-up treatment is facilitated.
As a preferred technical solution of the present invention, in the step (1), the motor frequency of the three-separation powder concentrator is 5 to 30Hz, such as 5Hz, 10Hz, 15Hz, 20Hz, 25Hz or 30Hz, but not limited to the recited values, and other unrecited values in the range of the values are also applicable; the induced air frequency of the dust collector is 20-60 Hz, such as 20Hz, 25Hz, 30Hz, 35Hz, 40Hz, 45Hz, 50Hz, 55Hz or 60Hz, but it is not limited to the values listed, and other values not listed in the range of the values are also applicable.
As a preferred technical solution of the present invention, in the step (2), the motor frequency of the three-separation powder concentrator is 10 to 30Hz, such as 10Hz, 12Hz, 15Hz, 18Hz, 20Hz, 23Hz, 25Hz, 27Hz, or 30Hz, but not limited to the recited values, and other unrecited values within the range of the values are also applicable; the induced air frequency of the dust collector is 30-70 Hz, such as 30Hz, 35Hz, 40Hz, 45Hz, 50Hz, 55Hz, 60Hz, 65Hz or 70Hz, but not limited to the values listed, and other values not listed in the range of the values are also applicable.
The selection of the three-separation powder concentrator and the working frequency of the dust collector is related to the separation of the particle sizes of carbide slag particles, when the carbide slag is firstly separated, the particle size difference is large, the selection frequency is not too high, and when the separated medium and coarse particles are separated again, the working frequency needs to be correspondingly increased due to the reduction of the particle size difference, so that the separation of the particles with different particle sizes is facilitated.
In addition, the number of sorting processes can also be adjusted according to the actual situation of the particles to achieve the best separation effect.
As a preferred embodiment of the present invention, in step (1) and step (2), the coarse particles are mixed and passed through a 35-mesh sieve to obtain a residual solid content of not less than 80 wt%, for example, 80 wt%, 82 wt%, 85 wt%, 88 wt%, 90 wt%, 92 wt%, 95 wt% or 98 wt%, but not limited to the values listed, and other values not listed in the range of the values are also applicable; the second coarse particles of step (2) are sieved through a 250 mesh sieve to obtain a residual solid content of not less than 95 wt%, such as 95 wt%, 96 wt%, 97 wt%, 98 wt% or 99 wt%, but not limited to the recited values, and other values not recited in the range of the recited values are also applicable; the fine particles of step (1) and step (2) are combined and sieved through a 250 mesh sieve to leave a solids level of no greater than 10 wt%, such as 10 wt%, 8 wt%, 6 wt%, 4 wt%, 2 wt%, 1 wt%, or 0.5 wt%, and the like, but are not limited to the recited values, and other values not recited within the range are equally applicable.
In the invention, the particle size division of coarse particles, medium coarse particles and fine particles is related to the carbide slag generated by the acetylene production process, components with different purposes in the carbide slag have corresponding particle size ranges, and the separation is realized by setting working parameters of a device after the particle size division.
As a preferred technical solution of the present invention, the coarse particles of the step (1) and the step (2) are used as ferrosilicon primary products.
As a preferred technical scheme of the invention, the second coarse particles in the step (2) are used as a modifier of the basicity in the preparation process of the polyaluminium chloride (PAC).
Preferably, the PAC preparation solution has an alumina content of greater than 7 wt%, such as 8 wt%, 10 wt%, 12 wt%, 15 wt%, 18 wt%, 20 wt%, 25 wt%, or 30 wt%, and the like, but is not limited to the recited values, and other values not recited within this range are equally applicable.
As a preferable technical scheme of the invention, the surface modification in the step (3) is surface modification by a chemical method.
Preferably, the chemical process comprises surface coating and/or precipitation coating.
In the invention, the fine particles in the carbide slag are subjected to surface modification, the specific surface area of the carbide slag is increased by methods of surface coating, precipitation coating and the like, so that the active sites on the surface of the carbide slag are increased, and the reaction rate of the carbide slag and sulfur dioxide can be accelerated when the carbide slag is used as a desulfurizing agent.
As a preferred technical scheme of the invention, the method comprises the following steps:
(1) carrying out sorting treatment on the carbide slag in a three-separation powder concentrator, wherein the treatment capacity of the carbide slag is 10-200 t/h, a fine particle outlet of the three-separation powder concentrator is sequentially connected with a cyclone cylinder and a dust collector, the motor frequency of the three-separation powder concentrator is 5-30 Hz, the induced air frequency of the dust collector is 20-60 Hz, first coarse particles, first medium coarse particles and first fine particles are obtained, the residual solid content of the first medium coarse particles after passing through a sieve with 35 meshes is not less than 80 wt%, the first medium coarse particles are used as a ferrosilicon primary product, the residual solid content of the first medium coarse particles after passing through a sieve with 250 meshes is not less than 70 wt%, and the residual solid content of the first fine particles after passing through a sieve with 250 meshes is not more than 10 wt%;
(2) returning the first medium coarse particles obtained in the step (1) to the three-separation powder concentrator in the step (1) for sorting again, wherein the motor frequency of the three-separation powder concentrator is 10-30 Hz, the induced air frequency of a dust collector is 30-70 Hz, so that second coarse particles, second medium coarse particles and second fine particles are obtained, the residual solid content of the second coarse particles passing through a 35-mesh sieve is not less than 95 wt% and used as a ferrosilicon primary product, the residual solid content of the second medium coarse particles passing through a 250-mesh sieve is not less than 95 wt% and used as a basicity regulator in the PAC preparation process, and the residual content of the second fine particles passing through the 250-mesh sieve is not more than 10 wt%;
(3) and (3) carrying out surface modification on the first fine particles obtained in the step (1) and the second fine particles obtained in the step (2) by adopting a chemical method to obtain the desulfurizing agent.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the method, the carbide slag is divided into coarse particles, medium coarse particles and fine particles, the coarse particles are used as ferrosilicon primary products, the medium coarse particles are used as a basicity regulator in the PAC preparation process, the fine particles are used as a high-performance desulfurizer through surface modification, the carbide slag is recycled, and the desulfurization efficiency of the obtained desulfurizer product can reach more than 95%;
(2) the method has the advantages of simple operation, short flow, no secondary solid waste discharge, effective solving of the pollution problem of the carbide slag and good economic and social benefits.
Drawings
FIG. 1 is a process flow diagram of a method for preparing a desulfurizing agent by using carbide slag according to embodiment 1 of the present invention.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions, the present invention is further described in detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
The following are typical but non-limiting examples of the invention:
example 1:
the embodiment provides a method for preparing a desulfurizing agent by using carbide slag, and the process flow diagram of the method is shown in figure 1, and the method comprises the following steps:
(1) adding carbide slag into a three-separation powder concentrator at a speed of 10t/h for sorting treatment, wherein a fine particle outlet of the three-separation powder concentrator is sequentially connected with a cyclone cylinder and a dust collector, the working frequency of the three-separation powder concentrator is 10Hz, and the induced air frequency of the dust collector is 20Hz, so as to obtain first coarse particles, first medium coarse particles and first fine particles, wherein the first coarse particles are used as ferrosilicon primary products;
(2) returning the first medium coarse particles obtained in the step (1) to the three-separation powder concentrator in the step (1) for sorting again, wherein the working frequency of the three-separation powder concentrator is 15Hz, and the induced air frequency of the dust collector is 30Hz, so that second coarse particles, second medium coarse particles and second fine particles are obtained, the second coarse particles are used as ferrosilicon primary products, and the second medium coarse particles are used as PAC (polyaluminium chloride) prepared salinity regulators;
(3) and (3) carrying out surface modification on the fine particles obtained in the step (1) and the step (2) by adopting a surface coating method to obtain the desulfurizing agent.
In the embodiment, the desulfurizer product obtained in the step (3) is sieved by a 250-mesh sieve, and the residual solid accounts for 0.64 wt%; the obtained product was subjected to X-ray fluorescence spectroscopy (XRF) analysis, and the composition of the obtained product is shown in table 1; the obtained product is applied to the flue gas desulfurization process, and the desulfurization efficiency can reach 96%.
Table 1 XRF analysis of the product obtained in example 1
Example 2:
the embodiment provides a method for preparing a desulfurizing agent by using carbide slag, which comprises the following steps:
(1) adding carbide slag into a three-separation powder concentrator at a speed of 50t/h for sorting treatment, wherein a fine particle outlet of the three-separation powder concentrator is sequentially connected with a cyclone cylinder and a dust collector, the working frequency of the three-separation powder concentrator is 15Hz, and the induced air frequency of the dust collector is 30Hz, so as to obtain first coarse particles, first medium coarse particles and first fine particles, wherein the first coarse particles are used as ferrosilicon primary products;
(2) returning the first medium coarse particles obtained in the step (1) to the three-separation powder concentrator in the step (1) for sorting again, wherein the working frequency of the three-separation powder concentrator is 20Hz, and the induced air frequency of the dust collector is 40Hz, so that second coarse particles, second medium coarse particles and second fine particles are obtained, the second coarse particles are used as ferrosilicon primary products, and the second medium coarse particles are used as PAC (polyaluminium chloride) prepared salinity regulators;
(3) and (3) carrying out surface modification on the fine particles obtained in the step (1) and the step (2) by adopting a precipitation coating method to obtain the desulfurizing agent.
In the embodiment, the desulfurizer product obtained in the step (3) is sieved by a 250-mesh sieve, and the residual solid accounts for 1.88 wt%; XRF analysis of the product obtained, the composition of the product obtained is shown in table 2; the obtained product is applied to the flue gas desulfurization process, and the desulfurization efficiency can reach 95.5 percent.
Table 2 XRF analysis of the product obtained in example 2
Example 3:
the embodiment provides a method for preparing a desulfurizing agent by using carbide slag, which comprises the following steps:
(1) adding carbide slag into a three-separation powder concentrator at a speed of 150t/h for sorting treatment, wherein a fine particle outlet of the three-separation powder concentrator is sequentially connected with a cyclone cylinder and a dust collector, the working frequency of the three-separation powder concentrator is 24Hz, and the induced air frequency of the dust collector is 50Hz, so as to obtain first coarse particles, first medium coarse particles and first fine particles, wherein the first coarse particles are used as ferrosilicon primary products;
(2) returning the first medium coarse particles obtained in the step (1) to the three-separation powder concentrator in the step (1) for sorting again, wherein the working frequency of the three-separation powder concentrator is 28Hz, and the induced air frequency of the dust collector is 60Hz, so that second coarse particles, second medium coarse particles and second fine particles are obtained, the second coarse particles are used as ferrosilicon primary products, and the second medium coarse particles are used as PAC (polyaluminium chloride) prepared salinity regulators;
(3) and (3) carrying out surface modification on the fine particles obtained in the step (1) and the step (2) by adopting a surface coating method to obtain the desulfurizing agent.
In the embodiment, the desulfurizer product obtained in the step (3) is sieved by a 250-mesh sieve, and the residual solid accounts for 3.60 wt%; XRF analysis of the product obtained, the composition of the product obtained is shown in table 3; the obtained product is applied to the flue gas desulfurization process, and the desulfurization efficiency can reach 97%.
Table 3 XRF analysis of the product obtained in example 3
Example 4:
the embodiment provides a method for preparing a desulfurizing agent by using carbide slag, which comprises the following steps:
(1) adding carbide slag into a three-separation powder concentrator at a speed of 100t/h for sorting treatment, wherein a fine particle outlet of the three-separation powder concentrator is sequentially connected with a cyclone cylinder and a dust collector, the working frequency of the three-separation powder concentrator is 20Hz, and the induced air frequency of the dust collector is 40Hz, so as to obtain first coarse particles, first medium coarse particles and first fine particles, wherein the first coarse particles are used as ferrosilicon primary products;
(2) returning the first medium coarse particles obtained in the step (1) to the three-separation powder concentrator in the step (1) for sorting again, wherein the working frequency of the three-separation powder concentrator is 25Hz, and the induced air frequency of the dust collector is 50Hz, so that second coarse particles, second medium coarse particles and second fine particles are obtained, the second coarse particles are used as ferrosilicon primary products, and the second medium coarse particles are used as PAC (polyaluminium chloride) prepared salinity regulators;
(3) and (3) carrying out surface modification on the fine particles obtained in the step (1) and the step (2) by adopting a precipitation coating method to obtain the desulfurizing agent.
In the embodiment, the desulfurizer product obtained in the step (3) is sieved by a 250-mesh sieve, and the residual solid accounts for 6.92 wt%; XRF analysis of the product obtained, the composition of the product obtained is shown in table 4; the obtained product is applied to the flue gas desulfurization process, and the desulfurization efficiency can reach 98%.
Table 4 XRF analysis of the product obtained in example 4
Example 5:
the embodiment provides a method for preparing a desulfurizing agent by using carbide slag, which comprises the following steps:
(1) adding carbide slag into a three-separation powder concentrator at a speed of 200t/h for sorting treatment, wherein a fine particle outlet of the three-separation powder concentrator is sequentially connected with a cyclone cylinder and a dust collector, the working frequency of the three-separation powder concentrator is 27Hz, and the induced air frequency of the dust collector is 60Hz, so as to obtain first coarse particles, first medium coarse particles and first fine particles, wherein the first coarse particles are used as ferrosilicon primary products;
(2) returning the first medium coarse particles obtained in the step (1) to the three-separation powder concentrator in the step (1) for sorting again, wherein the working frequency of the three-separation powder concentrator is 30Hz, and the induced air frequency of the dust collector is 70Hz, so that second coarse particles, second medium coarse particles and second fine particles are obtained, the second coarse particles are used as ferrosilicon primary products, and the second medium coarse particles are used as PAC (polyaluminium chloride) prepared salinity regulators;
(3) and (3) carrying out surface modification on the fine particles obtained in the step (1) and the step (2) by adopting a precipitation coating method to obtain the desulfurizing agent.
In the embodiment, the desulfurizer product obtained in the step (3) is sieved by a 250-mesh sieve, and the residual solid accounts for 9.20 wt%; XRF analysis of the product obtained, the composition of the product obtained is shown in table 5; the obtained product is applied to the flue gas desulfurization process, and the desulfurization efficiency can reach 95%.
Table 5 XRF analysis of the product obtained in example 5
From the results of the above examples, it can be seen that the desulfurizing agent product passes through a 250 mesh sieve, and the particle size of 90 wt% or more of the product is less than 60 μm according to the proportion of the residual solids; the results show that the three-separation powder concentrator can completely separate carbide slag particles with different particle sizes, and resource utilization of the carbide slag is realized.
Because the XRF analysis can not measure hydrogen, the hydroxide is expressed in a form of corresponding oxide, the content of the calcium oxide component reaches about 94 wt%, and then according to the actual composition of the carbide slag, the main component of the obtained desulfurizer is calcium hydroxide; when the desulfurizer is used as a desulfurizer, the desulfurization efficiency can reach more than 95%.
Comparative example 1:
this comparative example provides a process for preparing a desulfurizing agent using carbide slag, which is described with reference to example 1, except that: does not include the step (3), namely, the fine particles obtained by separation are directly used as a desulfurizing agent without surface coating modification treatment.
In this comparative example, since the fine particles were not surface-modified, the specific surface area was relatively small as compared with example 1, the active sites on the surface were also reduced accordingly, and the desulfurization efficiency was only 80% when used as a desulfurizing agent.
By integrating the above embodiments and comparative examples, the method provided by the invention can be used for sorting the carbide slag, directly separating the carbide slag into coarse particles, medium coarse particles and fine particles, and completely separating the particles with different particle size ranges, so that the carbide slag has different purposes, the resource utilization of the carbide slag is realized, and the desulfurization efficiency of the obtained desulfurizer product can reach more than 95%; the method is simple to operate, short in flow, free of crushing, drying or calcining processes, free of secondary solid waste discharge, capable of effectively solving the pollution problem of the carbide slag, and good in economic benefit and social benefit.
The applicant states that the process of the present invention is illustrated by the above examples, but the present invention is not limited to the above process, i.e. it is not meant that the present invention must rely on the above process to be carried out. It will be apparent to those skilled in the art that any modifications to the present invention, equivalents to selected operations of the invention, additions of additional operations, selection of specific ways, etc., are within the scope and disclosure of the invention.
Claims (6)
1. A method for preparing a desulfurizing agent by using carbide slag is characterized by comprising the following steps:
(1) carrying out sorting treatment on carbide slag in a three-separation powder separator, wherein fine particle outlets of the three-separation powder separator are connected with a cyclone cylinder and a dust collector in parallel, the motor frequency of the three-separation powder separator is 5-30 Hz, and the induced air frequency of the dust collector is 20-60 Hz, so as to obtain first coarse particles, first medium coarse particles and first fine particles;
(2) returning the first medium coarse particles obtained in the step (1) to the three separation powder separators in the step (1) for separation again, wherein the motor frequency of the three separation powder separators is 10-30 Hz, and the induced air frequency of the dust collector is 30-70 Hz, so that second coarse particles, second medium coarse particles and second fine particles are obtained;
(3) carrying out surface modification on the first fine particles obtained in the step (1) and the second fine particles obtained in the step (2) by adopting a chemical method, wherein the chemical method comprises surface coating and/or precipitation coating to obtain a desulfurizing agent;
wherein, the coarse particles obtained in the step (1) and the step (2) are mixed and then screened by a 35-mesh sieve, the residual solid content is not less than 80 wt%, and the coarse particles are used as a ferrosilicon primary product; step (2), the second coarse particles pass through a 250-mesh sieve, the residual solid content is not less than 95 wt%, and the second coarse particles are used as a modifier for salinity in the preparation process of the polyaluminium chloride; and (3) after the fine particles in the step (1) and the step (2) are mixed, sieving the mixture by a 250-mesh sieve to obtain the mixture, wherein the residual solid content is not more than 10 wt%.
2. The method according to claim 1, wherein the carbide slag of step (1) is produced by a dry acetylene production process.
3. The method according to claim 1, characterized in that a dust collection bag is connected to the medium coarse particle outlet of the three separation and separation powder concentrator in the steps (1) and (2).
4. The method according to claim 1, characterized in that the coarse particle outlet of the three separation powder concentrator in the steps (1) and (2) is connected with a boiling fluidized bed.
5. The method according to claim 1, wherein the alumina content in the preparation solution of polyaluminium chloride is more than 7 wt%.
6. The method according to any one of claims 1-5, characterized in that the method comprises the steps of:
(1) carrying out sorting treatment on carbide slag in a three-separation powder concentrator, wherein the treatment capacity of the carbide slag is 10-200 t/h, a fine particle outlet of the three-separation powder concentrator is connected with a cyclone cylinder and a dust collector, the motor frequency of the three-separation powder concentrator is 5-30 Hz, and the induced air frequency of the dust collector is 20-60 Hz, so as to obtain first coarse particles, first medium coarse particles and first fine particles, wherein the first coarse particles are used as ferrosilicon primary products;
(2) returning the first medium coarse particles obtained in the step (1) to the three-separation powder concentrator in the step (1) for sorting again, wherein the motor frequency of the three-separation powder concentrator is 10-30 Hz, and the induced air frequency of a dust collector is 30-70 Hz, so that second coarse particles, second medium coarse particles and second fine particles are obtained, the second coarse particles are used as a ferrosilicon primary product, and the second medium coarse particles are used as a modifier for the basicity in the preparation process of the polyaluminium chloride;
(3) carrying out surface modification on the first fine particles obtained in the step (1) and the second fine particles obtained in the step (2) by adopting a chemical method, wherein the chemical method comprises surface coating and/or precipitation coating to obtain a desulfurizing agent;
wherein, the coarse particles in the step (1) and the step (2) are mixed and then sieved by a 35-mesh sieve, the residual solid content is not less than 80 wt%, the coarse particles in the step (2) are sieved by a 250-mesh sieve, the residual solid content is not less than 95 wt%, and the residual solid content is not more than 10 wt% after the fine particles in the step (1) and the step (2) are mixed and then sieved by a 250-mesh sieve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810717426.7A CN108906316B (en) | 2018-07-03 | 2018-07-03 | Method for preparing desulfurizer by using carbide slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810717426.7A CN108906316B (en) | 2018-07-03 | 2018-07-03 | Method for preparing desulfurizer by using carbide slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108906316A CN108906316A (en) | 2018-11-30 |
| CN108906316B true CN108906316B (en) | 2020-10-27 |
Family
ID=64423463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810717426.7A Active CN108906316B (en) | 2018-07-03 | 2018-07-03 | Method for preparing desulfurizer by using carbide slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108906316B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109650428A (en) * | 2019-02-14 | 2019-04-19 | 陕西金泰氯碱化工有限公司 | A method of lime and desulfurizing agent are produced simultaneously using carbide slag |
| CN110079371B (en) * | 2019-04-30 | 2021-09-14 | 封金财 | Preparation method of purification particles for biomass fuel |
| CN111517678A (en) * | 2020-03-25 | 2020-08-11 | 安徽华塑股份有限公司 | Device and process for drying and selecting carbide slag by using high-temperature gas at tail of cement kiln |
| CN115055275B (en) * | 2022-06-15 | 2024-04-05 | 包头地平线环保科技有限公司 | Carbide slag does not have useless comprehensive utilization preparation system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS558481A (en) * | 1978-07-05 | 1980-01-22 | Denki Kagaku Kogyo Kk | Desulfurizer for molten iron |
| CN102068898B (en) * | 2010-12-04 | 2013-07-17 | 宁夏博浩环保技术有限公司 | Composite calcium-based solid desulfurizer and production method thereof |
| CN102266715B (en) * | 2011-06-19 | 2014-04-30 | 肖郁春 | Method for producing desulfurizing agent from carbide slag |
| CN103752147B (en) * | 2014-01-21 | 2016-03-16 | 福建龙净脱硫脱硝工程有限公司 | A kind of dry-desulphurizer and preparation method thereof |
| CN204417346U (en) * | 2015-02-10 | 2015-06-24 | 田耀武 | Silicon, iron particle separation system in dry acetylene sludge |
-
2018
- 2018-07-03 CN CN201810717426.7A patent/CN108906316B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108906316A (en) | 2018-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108906316B (en) | Method for preparing desulfurizer by using carbide slag | |
| CN106927699B (en) | A method of calcium carbide lime is prepared using carbide slag | |
| CN103288116B (en) | Method for preparing high-purity calcium hydroxide from carbide slag | |
| CN108046302B (en) | Method for producing high-purity hydrated lime from carbide slag | |
| CN108483477B (en) | Method for preparing active calcium oxide by using carbide slag | |
| TWI271395B (en) | Cement kiln chlorine sulfur bypass system | |
| CN105502460B (en) | Utilize the method for production of calcium carbide from its residue raw material | |
| CN102616825B (en) | Purification process of desulfurization gypsum and gypsum raw materials purified through process | |
| CN106477611A (en) | A kind of method preparing precipitated calcium carbonate using carbide slag and flue solid/liquid/gas reactions | |
| CN111939745A (en) | Method for preparing desulfurizer from carbide slag, efficiently desulfurizing and utilizing desulfurized gypsum | |
| CN103726074A (en) | Method for producing aluminum electrolyte by using aluminum electrolysis waste materials and recycling carbon | |
| CN113976309A (en) | Method for comprehensively recovering lithium, tantalum-niobium, silicon-aluminum micro powder, iron ore concentrate and gypsum from lithium slag | |
| CN110438338A (en) | The device and method of nickel, cobalt co-production magnesia is recycled from nickel cobalt magnesium waste liquid | |
| CN103233119B (en) | Process for producing manganese sulfate by treating two ores with acid | |
| CN107662931B (en) | A kind of technique extracted potassium from Potassium waste and prepare potassium sulfate | |
| CN100446866C (en) | Method for recovering iron concentrate from blast furnace dust | |
| CN113019714B (en) | Impurity removal system device and impurity removal method for carbide slag | |
| CN112456619A (en) | Method and device for producing water treatment regulator by using carbide slag | |
| CN111747437A (en) | Preparation process of ultrafine calcium carbonate powder | |
| CN216459396U (en) | System for lithium, tantalum niobium, silicon-aluminum miropowder, iron ore concentrate and gypsum are retrieved to lithium sediment is synthesized | |
| CN110606675A (en) | Vanadium-titanium slag superfine powder admixture and preparation method thereof | |
| CN104741214A (en) | System and method for preparing pulverized coal fuel of pulverized-coal boiler by using coal washing tailings | |
| CN112010336B (en) | Method for preparing industrial calcium oxide for calcium carbide from calcium carbide slag | |
| CN102161514B (en) | Method for extracting metal hydroxide from gangue | |
| CN114247553B (en) | Comprehensive separation method for gangue minerals |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |