CN108483477A - A method of preparing active calcium oxide using carbide slag - Google Patents
A method of preparing active calcium oxide using carbide slag Download PDFInfo
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- CN108483477A CN108483477A CN201810719129.6A CN201810719129A CN108483477A CN 108483477 A CN108483477 A CN 108483477A CN 201810719129 A CN201810719129 A CN 201810719129A CN 108483477 A CN108483477 A CN 108483477A
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- coarse granule
- fine grained
- carbide slag
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/02—Oxides or hydroxides
- C01F11/04—Oxides or hydroxides by thermal decomposition
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Abstract
The present invention provides a kind of method preparing active calcium oxide using carbide slag, the method includes：Carbide slag is subjected to sorting process in three composition dividing powder separating machine, obtains coarse granule and the first fine grained in the first coarse granule, first；By above-mentioned sorting process obtain first in coarse granule carry out sorting process again, obtain coarse granule and the second fine grained in the second coarse granule, second；The fine grained that sorting process obtains is mixed with additive, forming processes and sintering processes is carried out successively, obtains active calcium oxide.The calcium carbide solid impurity particle of different-grain diameter is detached more thorough by the method for the invention, and has different purposes, realizes the recycling of carbide slag；The method is simple for process, flow is short, without secondary solid waste discharge, efficiently solves the pollution problem of carbide slag, has good economy and social value.
Description
Technical field
The invention belongs to solid waste resource recoveries to utilize technical field, be related to a kind of utilization carbide slag preparation active oxidation
The method of calcium.
Background technology
Carbide slag is that calcium carbide reacts the solid waste for preparing and generating during acetylene, polyvinyl chloride (PVC) industry with water
About 18,000,000 tons of carbide slags of discharge every year.Contain abundant calcium resource in carbide slag, there is very big potential resource recycle value,
Its utilization ways includes mainly production of construction materials, environmental improvement, common calcification chemical product.The usually mating cement producing line of carbide slag,
In recent years, as cement industry excess capacity, the calcium carbide quantity of slag of consumption gradually decrease, overall utilization rate is only discharge capacity
15%, a large amount of stackings of carbide slag are caused, not only occupy a large amount of soils, and seriously pollute environment.
Active calcium oxide is also known as the efficient oxidation calcium, is the leading indicator for weighing lime quality.Widely used quality in the world
Well, react fast, the thorough active calcium oxide of slag making replaces common calcium oxide to be applied to metallurgy industry.Active calcium oxide has because of it
The advantages that crystal grain is small, the porosity is high, bulk density is small, large specific surface area, reactivity is strong, impurity is low, epigranular is also by chemical industry
And other industry high-end product extensive use.Traditional activated calcium oxide is produced by calcination of calcium carbonate, as Calcium Carbonate resource is opened
The gradual control adopted prepares active calcium oxide using solid waste such as carbide slags and has become research hotspot.Hydrogen-oxygen in carbide slag
Change calcium content and can reach 80%~90%, refined calcium hydroxide can be obtained with separating-purifying, and then produce calcium oxide.
103288116 A of CN disclose a kind of method preparing high-purity calcium hydroxide using carbide slag, and this method first will be electric
Rock ballast is made into slurries, is dispersed through, is sieved successively, stirring, cyclonic separation, and collection obtains product, but this method is only through physical separation
Process, it is relatively low to the removal rate of impurity.104828824 A of CN disclose a kind of carbide slag and prepare calcium carbide with coke powder coforming
Method, this method are that carbide slag after purifying prepares carbon containing carbide slag with coke powder organic binder coforming, then through calcining
Dehydrating and curing is prepared into carbon containing blocky calcium oxide, is then fired into calcium carbide in high-temperature electric resistance furnace again, and this method needs first to carbide slag
Modification, subsequent processes are relatively complicated, and cost is higher.105502460 A of CN disclose a kind of utilization carbide slag production
The method of carbide raw material, this method first sieve carbide slag, then detach, remove water through magnetic separation, ore grinding, ore pulp modulation, suspension again,
Mixed carbon, granulating and forming, drying and calcination process, the process is complicated, needs by processes such as ore grindings, production cost is high.
In conclusion also needing to seek that carbide slag can be carried out to simple, efficient purification, then active calcium oxide is prepared
Method, enable carbide slag resource efficiently using and secondary pollution will not be brought.
Invention content
In view of the problems of the existing technology, the purpose of the present invention is to provide a kind of active oxidation is prepared using carbide slag
The method of calcium, the method by carbide slag by carrying out sorting process, directly by carbide slag by coarse granule, middle coarse granule and thin
Grain separates, then active calcium oxide is prepared.Present invention process is simple, easy to operate, and without secondary solid waste discharge, warp
Social benefit of helping is preferable.
For this purpose, the present invention uses following technical scheme：
The present invention provides a kind of methods preparing active calcium oxide using carbide slag, the described method comprises the following steps：
(1) carbide slag is carried out to sorting process in three composition dividing powder separating machine, obtain in the first coarse granule, first coarse granule and
First fine grained；
(2) by step (1) obtain first in coarse granule return to step (1) described three composition dividing powder separating machine sort again
Processing, obtains coarse granule and the second fine grained in the second coarse granule, second；
(3) fine grained that step (1) and step (2) obtain is mixed with additive, carries out forming processes and sintering successively
Processing, obtains active calcium oxide.
In the present invention, using the carbide slag generated during dry process production acetylene as raw material, sorting process is carried out, can be obtained
Particle separation to coarse granule, middle coarse granule and fine grained, different-grain diameter is more thorough, has different purposes, convenient for difference
It utilizes, fine grained therein obtains active calcium oxide by material mixing, molding and sintering processes.The method of the invention technique letter
List, flow are short, without secondary solid waste discharge, realize the efficient recycling of carbide slag waste material obtained by different process, have good
Economy and social value.
In the present invention, " first " and " second " before coarse granule, middle coarse granule and fine grained, is not the limit to particle
System only facilitates the particle after being detached to different phase to distinguish.
It is used as currently preferred technical solution below, but not as the limitation of technical solution provided by the invention, passes through
Following technical scheme can preferably reach and realize the technical purpose and advantageous effect of the present invention.
As currently preferred technical solution, step (1) described carbide slag is generated by drying acetylene production technology.
In the prior art, the production of acetylene mainly has two kinds of dry process and wet processing, and in of the invention, dry process obtains
It is carbide slag solid to arrive, referred to as dry method carbide slag, and sorting process can be directly carried out in three composition dividing powder separating machine.Carbide slag
The device size for the treatment of capacity and three composition dividing powder separating machine used, i.e. the accessible treatment scale of carbide slag is related, generally 10~
200t/h, such as 10t/h, 30t/h, 50t/h, 80t/h, 100t/h, 120t/h, 150t/h, 180t/h or 200t/h etc., but simultaneously
It is not limited only to cited numerical value, other unrequited numerical value are equally applicable in the numberical range.
As currently preferred technical solution, the fine grained of step (1) and step (2) described three composition dividing powder separating machine exports
It is connected with cyclone cylinder and dust-precipitator side by side.
In the present invention, three composition dividing powder separating machine can be by material " one dividing into three ", to realize different-grain diameter in carbide slag
Grain efficiently separates, and device configuration is simple, of low cost, selects powder significant effect.It is exported in the fine grained of three composition dividing powder separating machine
Cyclone cylinder is arranged can be effectively by fine particle collection, simultaneously because there are the smaller calcium carbide slag dust of grain size, lighter in weight,
It is easy to lose because of loss during grain sorting, so being set up in parallel dust-precipitator with cyclone cylinder, can be incited somebody to action under air inducing effect
Dust is fully collected, and avoids causing dust pollution, convenient for being further processed with fine grained.
Preferably, the middle coarse granule of step (1) and step (2) described three composition dividing powder separating machine outlet is connected with dust collecting sleeve.
Preferably, the outlet of the coarse granule of step (1) and step (2) described three composition dividing powder separating machine is connected with fluidizing fluid-bed.
It, can be by the speed of rotation of control three composition dividing powder separating machine inner impeller, to control between powder disk and inner wall in the present invention
Powder falling gap, so as to change coarse grained particle separation diameter；And by controlling the intake of three composition dividing powder separating machine, to adjust
Fine grain particle separation diameter.The coarse granule outlet of three composition dividing powder separating machine is connected with fluidizing fluid-bed, can make to be attached to coarse granule
On fine grained separated recycling, improve the separative efficiency of carbide slag, while also allowing for subsequent processing.
As currently preferred technical solution, the electric machine frequency of three composition dividing powder separating machine is 5~30Hz, example in step (1)
Such as 5Hz, 10Hz, 15Hz, 20Hz, 25Hz or 30Hz, it is not limited to cited numerical value, in the numberical range, other are not
The numerical value enumerated is equally applicable；The air inducing frequency of dust-precipitator be 20~60Hz, such as 20Hz, 25Hz, 30Hz, 35Hz, 40Hz,
45Hz, 50Hz, 55Hz or 60Hz etc., it is not limited to cited numerical value, other interior unrequited numerical value of the numberical range
It is equally applicable.
As currently preferred technical solution, the electric machine frequency of three composition dividing powder separating machine is 10~30Hz, example in step (2)
Such as 10Hz, 12Hz, 15Hz, 18Hz, 20Hz, 23Hz, 25Hz, 27Hz or 30Hz, it is not limited to cited numerical value, it should
Other unrequited numerical value are equally applicable in numberical range；The air inducing frequency of dust-precipitator be 30~70Hz, such as 30Hz, 35Hz,
40Hz, 45Hz, 50Hz, 55Hz, 60Hz, 65Hz or 70Hz etc., it is not limited to cited numerical value, in the numberical range its
His unrequited numerical value is equally applicable.
In the present invention, the selection of three composition dividing powder separating machine and dust-precipitator working frequency and the separation phase of carbide slag grain diameter
It closes, when carbide slag detaches for the first time, grain diameter difference is larger, and the frequency of selection does not have to middle coarse granule that is too high, and separating
When sorting again, since the difference of grain diameter reduces, working frequency needs corresponding increase, in order to point of different-grain diameter particle
From.
In addition, the number of sorting process can also be adjusted according to the actual conditions of particle, to reach best separation
Effect.
It is remaining that 35 mesh sieve is crossed as currently preferred technical solution, after step (1) and step (2) the coarse granule mixing
Amount of solid be not less than 80wt%, such as 80wt%, 82wt%, 85wt%, 88wt%, 90wt%, 92wt%, 95wt% or
98wt% etc., it is not limited to cited numerical value, other interior unrequited numerical value of the numberical range are equally applicable；Step
(2) coarse granule crosses 250 mesh sieve remaining solid amount and is not less than 95wt% in described second, for example, 95wt%, 96wt%, 97wt%,
98wt% or 99wt% etc., it is not limited to cited numerical value, other interior unrequited numerical value of the numberical range are equally suitable
With；250 mesh sieve remaining solid amount, which is crossed, after step (1) and step (2) the fine grained mixing is not more than 10wt%, such as
10wt%, 8wt%, 6wt%, 4wt%, 2wt%, 1wt% or 0.5wt% etc., it is not limited to cited numerical value, the number
It is equally applicable to be worth other unrequited numerical value in range.
In the present invention, coarse granule, middle coarse granule and fine grain grain size divide the carbide slag generated with acetylene production process
Related, the component of different purposes needs the work by the way that device is arranged in carbide slag after having its corresponding particle size range, grain size to divide
Separation is realized as parameter.
As currently preferred technical solution, step (1) and step (2) described coarse granule are used as ferrosilicon primary product.
Preferably, tune of the coarse granule for basicity in aluminium polychloride (PAC) preparation process in step (2) described second
Whole dose.
As currently preferred technical solution, step (3) described additive includes inorganic matter and/or organic matter.
In the present invention, the additive has certain viscosity, it can be achieved that fine grain benign viscous in carbide slag after processing
Knot, (1000~1300 DEG C) can volatilize under the high temperature conditions, not influence the activity of active oxidation calcium product.
Preferably, the inorganic matter includes inorganic coagulation material.
Preferably, the organic matter includes organic cementitious material and/or cellulose.
Preferably, the dosage of step (3) described additive is 0.5~1wt% of corresponding fine grained dosage, such as
0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt% or 1wt% etc., it is not limited to cited numerical value, it should
Other unrequited numerical value are equally applicable in numberical range.
In the present invention, the addition of additive in fine grained is conducive to the subsequent molding of fine grained, avoids in sintering process
Fine grained is caused because grain size is too small, weight kicks the beam due to walk-off-loss, is one of an important factor for influencing active calcium oxide performance, if
Additive amount is on the low side, and fine-grained powder can be caused not easily molded, if additive amount is on the high side, it will cause what is obtained after sintering
Active calcium oxide strength reduction, it is broken, it is reduced so as to cause the metallurgy activity of active calcium oxide.
As currently preferred technical solution, the pressure of step (3) described forming processes is 50~200MPa, such as
50MPa, 75MPa, 100MPa, 125MPa, 150MPa, 175MPa or 200MPa etc., it is not limited to cited numerical value, it should
Other unrequited numerical value are equally applicable in numberical range；Time be 0.5~1min, such as 0.5min, 0.6min, 0.7min,
0.8min, 0.9min or 1min etc., it is not limited to cited numerical value, other interior unrequited numerical value of the numberical range are same
Sample is applicable in.
Preferably, the temperature of the sintering processes be 1000~1300 DEG C, such as 1000 DEG C, 1050 DEG C, 1100 DEG C, 1150
DEG C, 1200 DEG C, 1250 DEG C or 1300 DEG C etc., it is not limited to cited numerical value, other are unrequited in the numberical range
Numerical value is equally applicable；Time be 20~90min, such as 20min, 30min, 40min, 50min, 60min, 70min, 80min or
90min etc., it is not limited to cited numerical value, other interior unrequited numerical value of the numberical range are equally applicable.
In the present invention, roasted after the fine grained and additive molding in carbide slag, it can be by main component hydrogen-oxygen
Change calcium and be converted into active calcium oxide, its specific surface area is made to increase, active site increases, and has better reactivity, is to influence
One of an important factor for active calcium oxide performance, can make carbide slag that can not convert if sintering temperature is relatively low, cannot obtain qualification
Active oxidation calcium product, if sintering temperature is higher, it is hardened that it will cause calcium oxide, and surface-active site is reduced, and activity reduces.
As currently preferred technical solution, the described method comprises the following steps：
(1) carbide slag is carried out to sorting process in three composition dividing powder separating machine, the treating capacity of the carbide slag is 10~200t/
The fine grained outlet of h, the three composition dividing powder separating machine are connected with cyclone cylinder and dust-precipitator, and the electric machine frequency of three composition dividing powder separating machine is 5
The air inducing frequency of~30Hz, dust-precipitator are 20~60Hz, obtain coarse granule and the first fine grained, institute in the first coarse granule, first
It states the first coarse granule and crosses 35 mesh sieve remaining solid amount and be not less than 80wt%, be used as ferrosilicon primary product, coarse granule in described first
It crosses 250 mesh sieve remaining solid amount and is not less than 70wt%, first fine grained is crossed 250 mesh sieve remaining solid amount and is not more than
10wt%；
(2) by step (1) obtain first in coarse granule return to step (1) described three composition dividing powder separating machine sort again
The electric machine frequency of processing, three composition dividing powder separating machine is 10~30Hz, and the air inducing frequency of dust-precipitator is 30~70Hz, obtains second thick
Coarse granule and the second fine grained in grain, second, second coarse granule cross 35 mesh sieve remaining solid amount and are not less than 95wt%, be used as
Ferrosilicon primary product, coarse granule crosses 250 mesh sieve remaining solid amount and is not less than 95wt% in described second, is used for polyaluminium aluminum
The regulator of basicity during standby, second fine grained cross 250 mesh sieve remaining solid amount and are not more than 10wt%；
(3) fine grained that step (1) and step (2) obtain is mixed with additive, the dosage of the additive is thin
0.5~1wt% of grain dosage carries out forming processes and sintering processes successively, and the forming processes pressure is 50~200MPa, at
Type processing time is 0.5~1min, and the sintering processes temperature is 1000~1300 DEG C, and the sintering processes time is 20~90min,
Obtain active calcium oxide.
Compared with prior art, the invention has the advantages that：
(1) present invention by the way that carbide slag is carried out sorting process, obtained coarse granule be used as ferrosilicon primary product, in thick
Regulator of the grain for basicity in PAC preparation process, fine grained are prepared active oxidation calcium product, are aoxidized in products obtained therefrom
Calcium content can reach 93wt% or more, and metallurgical activity degree can reach 360mL or more；
(2) the method for the invention is easy to operate, and flow is short, without secondary solid waste discharge, efficiently solves the dirt of carbide slag
Dye problem, with good economic efficiency and social benefit.
Description of the drawings
Fig. 1 is the process flow chart that active calcium oxide method is prepared using carbide slag that the embodiment of the present invention 1 provides.
Specific implementation mode
For the present invention is better described, be easy to understand technical solution, below the present invention is described in more detail.But it is following
Embodiment be only the present invention simple example, not represent or limit the scope of the present invention, the present invention protection
Range is subject to claims.
Specific embodiment of the invention part provides a kind of method preparing active calcium oxide using carbide slag, the side
Method includes the following steps：
(1) dry method carbide slag in three composition dividing powder separating machine is subjected to sorting process, obtains in the first coarse granule, first thick
Grain and the first fine grained；
(2) by step (1) obtain first in coarse granule return to step (1) described three composition dividing powder separating machine sort again
Processing, obtains coarse granule and the second fine grained in the second coarse granule, second；
(3) fine grained that step (1) and step (2) obtain is mixed with additive, carries out forming processes and sintering successively
Processing, obtains active calcium oxide.
It is present invention typical case but non-limiting embodiment below：
Embodiment 1：
Present embodiments provide a kind of method preparing active calcium oxide using carbide slag, the process flow chart of the method
As shown in Figure 1, including the following steps：
(1) dry method carbide slag is added by the rate of 10t/h in three composition dividing powder separating machine and carries out sorting process, three separation
The fine grained outlet of powder concentrator is connected with cyclone cylinder and dust-precipitator, and the electric machine frequency of three composition dividing powder separating machine is 10Hz, dust-precipitator
Air inducing frequency is 20Hz, obtains coarse granule and the first fine grained in the first coarse granule, first, and first coarse granule is used as ferrosilicon
Primary product；
(2) by step (1) obtain first in the three composition dividing powder separating machine of coarse granule return to step (1) carry out at sorting again
The working frequency of reason, three composition dividing powder separating machine is 15Hz, and the air inducing frequency of dust-precipitator is 30Hz, is obtained in the second coarse granule, second
Coarse granule and the second fine grained, second coarse granule are used as ferrosilicon primary product, and coarse granule is prepared as PAC in described second
Basicity regulator；
(3) fine grained that step (1) and step (2) obtain is mixed with inorganic coagulation material, the inorganic coagulation material
Dosage be fine grained dosage 1wt%, carry out forming processes and sintering processes, briquetting pressure 50MPa, molding time successively
For 0.5min, sintering temperature is 1000 DEG C, and sintering time 30min obtains active calcium oxide.
In the present embodiment, the content of calcium oxide is 94.4wt% in the product that step (3) obtains, and is with the hydrochloric acid of 4mol/L
Analytical reagent, the metallurgical activity degree for measuring active calcium oxide are 360mL.
Embodiment 2：
A kind of method preparing active calcium oxide using carbide slag is present embodiments provided, the method includes following steps
Suddenly：
(1) dry method carbide slag is added by the rate of 50t/h in three composition dividing powder separating machine and carries out sorting process, three separation
The fine grained outlet of powder concentrator is connected with cyclone cylinder and dust-precipitator in turn, and the working frequency of three composition dividing powder separating machine is 15Hz, is gathered dust
The air inducing frequency of device is 30Hz, obtains coarse granule and the first fine grained in the first coarse granule, first, first coarse granule is used as
Ferrosilicon primary product；
(2) by step (1) obtain first in the three composition dividing powder separating machine of coarse granule return to step (1) carry out at sorting again
The working frequency of reason, three composition dividing powder separating machine is 20Hz, and the air inducing frequency of dust-precipitator is 40Hz, is obtained in the second coarse granule, second
Coarse granule and the second fine grained, second coarse granule are used as ferrosilicon primary product, and coarse granule is prepared as PAC in described second
Basicity regulator；
(3) fine grained that step (1) and step (2) obtain is mixed with organic cementitious material, the organic cementitious material
Dosage be fine grained dosage 0.7wt%, carry out forming processes and sintering processes successively, briquetting pressure 80MPa, when molding
Between be 0.6min, sintering temperature be 1100 DEG C, sintering time 50min obtains active calcium oxide.
In the present embodiment, the content of calcium oxide is 94.4wt% in the product that step (3) obtains, and is with the hydrochloric acid of 4mol/L
Analytical reagent, the metallurgical activity degree for measuring active calcium oxide are 365mL.
Embodiment 3：
A kind of method preparing active calcium oxide using carbide slag is present embodiments provided, the method includes following steps
Suddenly：
(1) dry method carbide slag is added by the rate of 150t/h in three composition dividing powder separating machine and carries out sorting process, described three points
Fine grained outlet from powder concentrator is connected with cyclone cylinder and dust-precipitator in turn, and the working frequency of three composition dividing powder separating machine is 24Hz, is received
The air inducing frequency of dirt device is 50Hz, obtains coarse granule and the first fine grained in the first coarse granule, first, and first coarse granule is used
Make ferrosilicon primary product；
(2) by step (1) obtain first in the three composition dividing powder separating machine of coarse granule return to step (1) carry out at sorting again
The working frequency of reason, three composition dividing powder separating machine is 28Hz, and the air inducing frequency of dust-precipitator is 60Hz, is obtained in the second coarse granule, second
Coarse granule and the second fine grained, second coarse granule are used as ferrosilicon primary product, and coarse granule is prepared as PAC in described second
Basicity regulator；
(3) fine grained that step (1) and step (2) obtain is mixed with inorganic coagulation material, the inorganic coagulation material
Dosage be fine grained dosage 0.8wt%, carry out forming processes and sintering processes, briquetting pressure 160MPa, molding successively
Time is 0.75min, and sintering temperature is 1200 DEG C, and sintering time 75min obtains active calcium oxide.
In the present embodiment, the content of calcium oxide is 95.3wt% in the product that step (3) obtains, and is with the hydrochloric acid of 4mol/L
Analytical reagent, the metallurgical activity degree for measuring active calcium oxide are 368mL.
Embodiment 4：
A kind of method preparing active calcium oxide using carbide slag is present embodiments provided, the method includes following steps
Suddenly：
(1) dry method carbide slag is added by the rate of 100t/h in three composition dividing powder separating machine and carries out sorting process, described three points
Fine grained outlet from powder concentrator is connected with cyclone cylinder and dust-precipitator in turn, and the working frequency of three composition dividing powder separating machine is 20Hz, is received
The air inducing frequency of dirt device is 40Hz, obtains coarse granule and the first fine grained in the first coarse granule, first, and first coarse granule is used
Make ferrosilicon primary product；
(2) by step (1) obtain first in the three composition dividing powder separating machine of coarse granule return to step (1) carry out at sorting again
The working frequency of reason, three composition dividing powder separating machine is 25Hz, and the air inducing frequency of dust-precipitator is 50Hz, is obtained in the second coarse granule, second
Coarse granule and the second fine grained, second coarse granule are used as ferrosilicon primary product, and coarse granule is prepared as PAC in described second
Basicity regulator；
(3) fine grained that step (1) and step (2) obtain is mixed with inorganic coagulation material, organic cementitious material, it is described
Total dosage of inorganic coagulation material and organic cementitious material is the 0.6wt% of fine grained dosage, carries out forming processes and burning successively
Knot processing, briquetting pressure 120MPa, molding time 0.9min, sintering temperature are 1150 DEG C, and sintering time 60min is obtained
To active calcium oxide.
In the present embodiment, the content of calcium oxide is 96.2wt% in the product that step (3) obtains, and is with the hydrochloric acid of 4mol/L
Analytical reagent, the metallurgical activity degree for measuring active calcium oxide are 385mL.
Embodiment 5：
A kind of method preparing active calcium oxide using carbide slag is present embodiments provided, the method includes following steps
Suddenly：
(1) dry method carbide slag is added by the rate of 200t/h in three composition dividing powder separating machine and carries out sorting process, described three points
Fine grained outlet from powder concentrator is connected with cyclone cylinder and dust-precipitator in turn, and the working frequency of three composition dividing powder separating machine is 27Hz, is received
The air inducing frequency of dirt device is 60Hz, obtains coarse granule and the first fine grained in the first coarse granule, first, and first coarse granule is used
Make ferrosilicon primary product；
(2) by step (1) obtain first in the three composition dividing powder separating machine of coarse granule return to step (1) carry out at sorting again
The working frequency of reason, three composition dividing powder separating machine is 30Hz, and the air inducing frequency of dust-precipitator is 70Hz, is obtained in the second coarse granule, second
Coarse granule and the second fine grained, second coarse granule are used as ferrosilicon primary product, and coarse granule is prepared as PAC in described second
Basicity regulator；
(3) fine grained that step (1) and step (2) obtain is mixed with cellulose, the dosage of the cellulose is thin
The 0.5wt% of grain dosage, carries out forming processes and sintering processes successively, and briquetting pressure 200MPa, molding time 1min are burnt
Junction temperature is 1300 DEG C, and sintering time 90min obtains active calcium oxide.
In the present embodiment, the content of calcium oxide is 93.7wt% in the product that step (3) obtains, and is with the hydrochloric acid of 4mol/L
Analytical reagent, the metallurgical activity degree for measuring active calcium oxide are 360mL.
Embodiment 6：
Present embodiments provide a kind of method preparing active calcium oxide using carbide slag, the method with reference to embodiment 1,
It differs only in：The dosage of inorganic coagulation material is the 0.4wt% of fine grained dosage in step (3), i.e. the dosage of additive is inclined
It is few.
In the present embodiment, since the dosage of additive is on the low side, the molding effect under the same terms is deteriorated, intensity drop before being sintered
Low, when sintering, is not easy to promote the metallurgical activity of calcium oxide, and products obtained therefrom degree of crushing is larger after sintering, is with the hydrochloric acid of 4mol/L
Analytical reagent, the metallurgical activity degree for measuring active calcium oxide is only 350mL.
Embodiment 7：
Present embodiments provide a kind of method preparing active calcium oxide using carbide slag, the method with reference to embodiment 1,
It differs only in：The dosage of inorganic coagulation material is the 1.1wt% of fine grained dosage in step (3), i.e. the dosage of additive is inclined
It is more.
In the present embodiment, since the dosage of additive is on the high side, when molding under the same terms, when roasting, can form a large amount of
Stomata leads to strength reduction, and using the hydrochloric acid of 4mol/L as analytical reagent, the metallurgical activity degree for measuring active calcium oxide is only
348mL。
Embodiment 8：
Present embodiments provide a kind of method preparing active calcium oxide using carbide slag, the method with reference to embodiment 1,
It differs only in：Sintering temperature is 950 DEG C in step (3), i.e., sintering temperature is relatively low.
In the present embodiment, since sintering temperature is relatively low, calcium hydroxide can not be completely reformed into calcium oxide, gained by when roasting
The content of calcium oxide is reduced to 87wt% in product, using the hydrochloric acid of 4mol/L as analytical reagent, measures the metallurgy of active calcium oxide
Activity degree is only 346mL.
Embodiment 9：
Present embodiments provide a kind of method preparing active calcium oxide using carbide slag, the method with reference to embodiment 1,
It differs only in：Sintering temperature is 1350 DEG C in step (3), i.e., sintering temperature is higher.
In the present embodiment, since sintering temperature is higher, gained active calcium oxide product is hardened after roasting, and specific surface area subtracts
Small, active sites points are also corresponding to be reduced, even if the content of calcium oxide is 95wt% in the product, but is point with the hydrochloric acid of 4mol/L
Reagent is analysed, the metallurgical activity degree for measuring active calcium oxide is only 340mL.
Comparative example 1：
This comparative example provides a kind of method preparing active calcium oxide using carbide slag, the method with reference to embodiment 1,
It differs only in：Step (3) is added without inorganic coagulation material, i.e. fine grained directly carries out forming processes and sintering processes.
In this comparative example, since additive is not added in fine grained, molding effect is poor, and when roasting is not easy to improve oxidation
Calcium activity, using the hydrochloric acid of 4mol/L as analytical reagent, the metallurgical activity degree for measuring active oxidation calcium product is only 320mL.
It can be obtained with comparative example based on the above embodiments, the method for the invention is by sorting dry method carbide slag
Processing, is directly separated carbide slag by coarse granule, middle coarse granule and fine grained, and the particle separation of different-grain diameter range is more thorough
Bottom realizes the recycling of carbide slag, can reach 93wt% or more by calcium oxide content in fine grained products obtained therefrom, metallurgical
Activity degree can reach 360mL or more；The method is easy to operate, and flow is short, without secondary solid waste discharge, efficiently solves carbide slag
Pollution problem, with good economic efficiency and social benefit.
Applicant states that the present invention illustrates the process of the present invention, but the present invention not office by above-described embodiment
It is limited to above-mentioned process, that is, does not mean that the present invention has to rely on above-mentioned process and could implement.Technical field
Technical staff is it will be clearly understood that any improvement in the present invention, to the equivalence replacement that is operated selected by the present invention and auxiliary operation
Addition, the selection etc. of concrete mode, all fall within protection scope of the present invention and the open scope.
Claims (10)
1. a kind of method preparing active calcium oxide using carbide slag, which is characterized in that the described method comprises the following steps：
(1) carbide slag is carried out to sorting process in three composition dividing powder separating machine, obtains coarse granule and first in the first coarse granule, first
Fine grained；
(2) by step (1) obtain first in coarse granule return to step (1) described three composition dividing powder separating machine carry out at sorting again
Reason, obtains coarse granule and the second fine grained in the second coarse granule, second；
(3) fine grained that step (1) and step (2) obtain is mixed with additive, carries out forming processes and sintering processes successively,
Obtain active calcium oxide.
2. according to the method described in claim 1, it is characterized in that, step (1) described carbide slag is by drying acetylene production technology
It generates.
3. method according to claim 1 or 2, which is characterized in that step (1) and step (2) described three composition dividing powder separating machine
Fine grained outlet be connected with cyclone cylinder and dust-precipitator side by side；
Preferably, the middle coarse granule of step (1) and step (2) described three composition dividing powder separating machine outlet is connected with dust collecting sleeve；
Preferably, the outlet of the coarse granule of step (1) and step (2) described three composition dividing powder separating machine is connected with fluidizing fluid-bed.
4. according to claim 1-3 any one of them methods, which is characterized in that the motor of three composition dividing powder separating machine in step (1)
Frequency is 5~30Hz, and the air inducing frequency of dust-precipitator is 20~60Hz.
5. according to claim 1-4 any one of them methods, which is characterized in that the motor of three composition dividing powder separating machine in step (2)
Frequency is 10~30Hz, and the air inducing frequency of dust-precipitator is 30~70Hz.
6. according to claim 1-5 any one of them methods, which is characterized in that step (1) and step (2) described coarse granule are mixed
35 mesh sieve remaining solid amount is crossed after conjunction and is not less than 80wt%, and coarse granule crosses 250 mesh sieve remaining solid amount in step (2) described second
250 mesh sieve remaining solid amount, which is crossed, not less than 95wt%, after step (1) and step (2) the fine grained mixing is not more than 10wt%.
7. according to claim 1-6 any one of them methods, which is characterized in that step (1) and step (2) coarse granule are used
Make ferrosilicon primary product；
Preferably, regulator of the coarse granule for basicity in aluminium polychloride preparation process in step (2) described second.
8. according to claim 1-7 any one of them methods, which is characterized in that step (3) described additive includes inorganic matter
And/or organic matter；
Preferably, the inorganic matter includes inorganic coagulation material；
Preferably, the organic matter includes organic cementitious material and/or cellulose；
Preferably, the dosage of step (3) described additive is 0.5~1wt% of corresponding fine grained dosage.
9. according to claim 1-8 any one of them methods, which is characterized in that the pressure of step (3) described forming processes is
50~200MPa, time are 0.5~1min；
Preferably, the temperature of the sintering processes is 1000~1300 DEG C, and the time is 20~90min.
10. according to claim 1-9 any one of them methods, which is characterized in that the described method comprises the following steps：
(1) carbide slag is carried out to sorting process in three composition dividing powder separating machine, the treating capacity of the carbide slag is 10~200t/h, institute
The fine grained outlet for stating three composition dividing powder separating machine is connected with cyclone cylinder and dust-precipitator side by side, and the electric machine frequency of three composition dividing powder separating machine is 5
The air inducing frequency of~30Hz, dust-precipitator are 20~60Hz, obtain coarse granule and the first fine grained, institute in the first coarse granule, first
It states the first coarse granule and is used as ferrosilicon primary product；
(2) by step (1) obtain first in coarse granule return to step (1) described three composition dividing powder separating machine carry out at sorting again
The electric machine frequency of reason, three composition dividing powder separating machine is 10~30Hz, and the air inducing frequency of dust-precipitator is 30~70Hz, obtains second thick
Coarse granule and the second fine grained in grain, second, second coarse granule are used as ferrosilicon primary product, and coarse granule is used in described second
The regulator of basicity in aluminium polychloride preparation process；
(3) fine grained that step (1) and step (2) obtain is mixed with additive, the dosage of the additive is used for fine grained
0.5~1wt% of amount, carries out forming processes and sintering processes successively, and the forming processes pressure is 50~200MPa, at molding
The reason time is 0.5~1min, and the sintering processes temperature is 1000~1300 DEG C, and the sintering processes time is 20~90min, is obtained
Active calcium oxide.
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