CN108726550B - Method for preparing active calcium oxide by using carbide slag - Google Patents
Method for preparing active calcium oxide by using carbide slag Download PDFInfo
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Abstract
The invention provides a method for preparing active calcium oxide by using carbide slag, which comprises the following steps: screening the carbide slag slurry to obtain coarse particles and screened slurry; carrying out cyclone treatment on the obtained screened slurry to obtain first overflow slurry and first underflow slurry; performing cyclone treatment on the first underflow slurry again to obtain second overflow slurry and second underflow slurry, mixing the overflow slurries for two times, performing solid-liquid separation to obtain fine particles, and performing solid-liquid separation on the second underflow slurry to obtain medium coarse particles; and mixing the obtained fine particles with an additive, and sequentially carrying out molding treatment and sintering treatment to obtain the active calcium oxide. The method of the invention separates the carbide slag particles with different particle sizes thoroughly, has different purposes and realizes the resource utilization of the carbide slag; the method has the advantages of simple process, short flow, no secondary solid waste discharge, effective solving of the pollution problem of the carbide slag and good economic and social values.
Description
Technical Field
The invention belongs to the technical field of solid waste resource utilization, and relates to a method for preparing active calcium oxide by using carbide slag.
Background
Carbide slag is a solid waste generated in the process of preparing acetylene by reacting carbide with water, and the emission of the carbide slag in the polyvinyl chloride (PVC) industry is about 1800 ten thousand tons every year. 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 carbide slag is usually matched with a cement production line, in recent years, with the surplus of the productivity in the cement industry, the consumed carbide slag amount is gradually reduced, the whole utilization rate is only 15% of the discharge amount, the carbide slag is stacked in a large amount, a large amount of land is occupied, and the environment is seriously polluted.
Active calcium oxide is also called effective calcium oxide and is a main index for measuring the quality of lime. The active calcium oxide with good quality, fast reaction and thorough slag formation is widely used for replacing common calcium oxide in the metallurgical industry internationally. The activated calcium oxide has the advantages of small crystal grain, high porosity, small volume density, large specific surface area, strong reactivity, low impurity content, uniform granularity and the like, and is widely applied to high-end products in chemical industry and other industries. The traditional active calcium oxide is prepared by calcining calcium carbonate, and along with the gradual control of calcium carbonate resource exploitation, the preparation of the active calcium oxide by using solid wastes such as carbide slag and the like becomes a research hotspot. The calcium hydroxide content in the carbide slag can reach 80-90%, and the refined calcium hydroxide can be obtained through separation and purification, so that calcium oxide is produced.
CN 103288116A discloses a method for preparing high-purity calcium hydroxide by using carbide slag, which comprises the steps of preparing the carbide slag into slurry, sequentially carrying out dispersion, sieving, stirring and cyclone separation, and collecting to obtain a product, wherein the method only carries out a physical separation process, and has a low impurity removal rate. CN 104828824A discloses a method for preparing calcium carbide by co-molding carbide slag and coke powder, which comprises co-molding purified carbide slag and coke powder with an organic binder to prepare carbon-containing carbide slag, calcining, dehydrating and curing to prepare carbon-containing blocky calcium oxide, and then burning in a high-temperature electric furnace to prepare the calcium carbide. CN 105502460 a discloses a method for producing calcium carbide raw material by using calcium carbide slag, which comprises screening calcium carbide slag, then performing magnetic separation, ore grinding, ore pulp modulation, suspension separation, water removal, carbon mixing, granulation molding, drying and calcination, wherein the process is complex, and requires the processes of ore grinding and the like, thus the production cost is high.
In summary, a method for simply and efficiently purifying and preparing the carbide slag to obtain the active calcium oxide is needed, so that carbide slag resources can be efficiently utilized and secondary pollution is avoided.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for preparing active calcium oxide by using carbide slag. The invention has simple process, easy operation, no secondary solid waste discharge and better economic and social benefits.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for preparing active calcium oxide by using carbide slag, which comprises the following steps:
(a) preparing carbide slag into carbide slag slurry, and then screening to obtain coarse particles and screened slurry;
(b) performing cyclone treatment on the screened slurry obtained in the step (a) to obtain first overflow slurry and first underflow slurry;
(c) performing cyclone treatment on the underflow slurry obtained in the step (b) again to obtain second overflow slurry and second underflow slurry, mixing the second overflow slurry with the first overflow slurry obtained in the step (b), performing solid-liquid separation to obtain fine particles, and performing solid-liquid separation on the second underflow slurry to obtain medium coarse particles;
(d) and (c) mixing the fine particles obtained in the step (c) with an additive, and sequentially carrying out molding treatment and sintering treatment to obtain the active calcium oxide.
In the invention, the carbide slag generated in the wet acetylene production process is taken as a raw material, and screening and rotational flow treatment are carried out in sequence to obtain coarse particles, medium coarse particles and fine particles, the particles with different particle diameters are separated more thoroughly, the particles have different purposes and are convenient to be utilized respectively, and the fine particles are subjected to mixing, molding and sintering treatment to obtain the active calcium oxide. 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, the first and the second before the overflow slurry and the underflow slurry are not limited to the slurries, but are convenient to distinguish the slurries after being separated in different stages.
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 (a) is produced by a wet acetylene production process.
Preferably, the carbide slag of step (a) is treated in an amount of 10 to 200t/h, for example, 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.
In the invention, the carbide slag obtained by the wet process is called wet carbide slag, which has high water content and needs to be prepared into carbide slag slurry and then separated. The amount of carbide slag to be treated is generally 10 to 200t/h, for example 10t/h, 30t/h, 50t/h, 80t/h, 100t/h, 120t/h, 150t/h, 180t/h or 200t/h, depending on the size of the cyclone used, i.e. the scale of treatment achievable with the carbide slag, but is not limited to the values listed, and other values not listed within this range are equally applicable.
In a preferred embodiment of the present invention, the content of the carbide slag slurry in step (a) is 10 to 30 wt%, for example, 10 wt%, 12 wt%, 15 wt%, 18 wt%, 20 wt%, 23 wt%, 25 wt%, 27 wt%, or 30 wt%, but not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
Preferably, the screening process of step (a) is carried out in a vibrating screen.
Preferably, the sieve has a mesh size of 0.5 to 1.5mm, such as 0.5mm, 0.7mm, 0.9mm, 1.0mm, 1.2mm, 1.4mm, or 1.5mm, but not limited to the recited values, and other values not recited in the range of values are also applicable.
In the invention, the carbide slag generated by the wet acetylene production process cannot be directly separated by a dry method due to high water content, and needs to be prepared into carbide slag slurry for wet separation. Because of the difference of the particle size of the carbide slag, coarse particles can be separated by a vibrating screen with larger pore size, and the rest particles are further separated.
As a preferred technical solution of the present invention, the swirling treatment in the step (b) and the step (c) is performed in a cyclone.
Preferably, the swirl tube used in the swirl treatment of step (b) has a diameter of 100 to 300mm, for example 100mm, 150mm, 200mm, 250mm or 300mm, but is not limited to the values listed, and other values not listed in this range are equally suitable.
Preferably, the operating pressure of the swirling treatment in step (b) is 0.06 to 0.12MPa, such as 0.06MPa, 0.07MPa, 0.08MPa, 0.09MPa, 0.10MPa, 0.11MPa or 0.12MPa, but not limited to the recited values, and other values not recited in the range of the values are also applicable.
In a preferred embodiment of the present invention, in the swirling treatment in the step (c), the swirl tube used has a diameter of 25 to 75mm, for example, 25mm, 40mm, 50mm, 60mm or 75mm, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
In the invention, the separation effect of the cyclone treatment is related to the selection of the cyclone separation conditions, such as operation pressure, diameter of the cyclone tube and the like, and in order to achieve better separation effect, the underflow slurry after primary cyclone separation is subjected to secondary cyclone separation again to obtain overflow slurry and underflow slurry again.
Preferably, the operating pressure of the swirling treatment in step (c) is 0.06 to 0.12MPa, such as 0.06MPa, 0.07MPa, 0.08MPa, 0.09MPa, 0.10MPa, 0.11MPa or 0.12MPa, but not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the solid-liquid separation of step (c) is filtration.
Preferably, after the solid-liquid separation in step (c), the fine particles obtained are subjected to a drying treatment.
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 embodiment of the present invention, the coarse particles of step (a) are used as ferrosilicon primary products.
As a preferred technical scheme of the invention, the coarse particles in the step (c) are used as a modifier of the basicity in the preparation process of the polyaluminium chloride (PAC).
In a preferred embodiment of the present invention, the additive in step (d) comprises inorganic and/or organic substances.
In the invention, the additive has certain viscosity after being processed, can realize benign bonding of fine particles in carbide slag, can volatilize at high temperature (1000-1300 ℃), and does not influence the activity of an active calcium oxide product.
Preferably, the inorganic substance comprises an inorganic gelling material.
Preferably, the organic substance comprises an organic gelling material and/or cellulose.
Preferably, the additive of step (d) is used in an amount of 0.5 to 1 wt%, such as 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, or 1 wt%, based on the amount of the corresponding fine particles, but not limited to the recited values, and other values not recited in the range of the recited values are also applicable.
In the invention, the addition of the additive into the fine particles is beneficial to the subsequent forming of the fine particles, and the loss of the fine particles caused by over-small particle size and over-light weight in the sintering process is avoided, so that the loss is one of important factors influencing the performance of the activated calcium oxide.
In a preferred embodiment of the present invention, the pressure of the molding treatment in step (d) is 50 to 200MPa, for example, 50MPa, 75MPa, 100MPa, 125MPa, 150MPa, 175MPa, or 200MPa, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable; the time is 0.5 to 1min, for example, 0.5min, 0.6min, 0.7min, 0.8min, 0.9min or 1min, but is not limited to the values listed, and other values not listed in the range of the values are also applicable.
Preferably, the temperature of the sintering treatment is 1000 to 1300 ℃, for example 1000 ℃, 1050 ℃, 1100 ℃, 1150 ℃, 1200 ℃, 1250 ℃ or 1300 ℃, but not limited to the recited values, and other values not recited in the range of the values are also applicable; the time is 20 to 90min, for example, 20min, 30min, 40min, 50min, 60min, 70min, 80min or 90min, but is not limited to the values listed, and other values not listed in the range of the values are also applicable.
In the invention, fine particles in the carbide slag and the additive are molded and then roasted, so that the main component calcium hydroxide can be converted into active calcium oxide, the specific surface area of the active calcium oxide is increased, the active sites are increased, the active calcium oxide has better reaction activity, and the active calcium oxide is one of important factors influencing the performance of the active calcium oxide.
As a preferred technical scheme of the invention, the method comprises the following steps:
(a) preparing carbide slag into carbide slag slurry, wherein the solid content of the carbide slag slurry is 10-30 wt%, and then screening the carbide slag slurry in a vibrating screen, wherein the aperture of a screen hole of the vibrating screen is 0.5-1.5 mm, so as to obtain coarse particles and screened slurry, wherein the coarse particles are used as ferrosilicon primary products;
(b) performing cyclone treatment on the screened slurry obtained in the step (a) in a cyclone, wherein the diameter of a cyclone tube in the cyclone is 100-300 mm, and the operating pressure of the cyclone treatment is 0.06-0.12 MPa, so as to obtain first overflow slurry and first underflow slurry;
(c) performing cyclone treatment on the first underflow slurry obtained in the step (b) again, wherein the diameter of a cyclone pipe is 25-75 mm, the operating pressure of the cyclone treatment is 0.06-0.12 MPa, so as to obtain second overflow slurry and second underflow slurry, the second overflow slurry is mixed with the first overflow slurry obtained in the step (b), solid-liquid separation is performed, so as to obtain fine particles, medium coarse particles are obtained after the solid-liquid separation of the second underflow slurry, and the medium coarse particles are used as a basicity regulator in the preparation process of the polyaluminium chloride;
(d) and (c) mixing the fine particles obtained in the step (c) with an additive, wherein the dosage of the additive is 0.5-1 wt% of the dosage of the fine particles, sequentially carrying out forming treatment and sintering treatment, wherein the forming treatment pressure is 50-200 MPa, the forming treatment time is 0.5-1 min, the sintering treatment temperature is 1000-1300 ℃, and the sintering treatment time is 20-90 min, so as to obtain the active calcium oxide.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the carbide slag is sequentially subjected to screening treatment and rotational flow treatment, the obtained 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 for preparing active calcium oxide products, the content of calcium oxide in the obtained products can reach more than 92.5 wt%, and the metallurgical activity can reach more than 360 mL;
(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 chart of a method for preparing activated calcium oxide from 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 invention provides a method for preparing active calcium oxide by using carbide slag, which comprises the following steps:
(a) preparing the wet-process carbide slag into carbide slag slurry, and then screening to obtain coarse particles and screened slurry;
(b) performing cyclone treatment on the screened slurry obtained in the step (a) to obtain first overflow slurry and first underflow slurry;
(c) performing cyclone treatment on the first underflow slurry obtained in the step (b) again to obtain second overflow slurry and second underflow slurry, mixing the second overflow slurry with the first overflow slurry obtained in the step (b), performing solid-liquid separation to obtain fine particles, and performing solid-liquid separation on the second underflow slurry to obtain medium coarse particles;
(d) and (c) mixing the fine particles obtained in the step (c) with an additive, and sequentially carrying out molding treatment and sintering treatment to obtain the active calcium oxide.
The following are typical but non-limiting examples of the invention:
example 1:
the embodiment provides a method for preparing active calcium oxide by using carbide slag, and the process flow chart of the method is shown in figure 1, and the method comprises the following steps:
(a) preparing wet-process carbide slag into carbide slag slurry, wherein the solid content of the carbide slag slurry is 10 wt%, and then screening the carbide slag slurry in a vibrating screen, wherein the aperture of a screen hole of the vibrating screen is 1mm, so as to obtain coarse particles and screened slurry, wherein the coarse particles are used as ferrosilicon primary products;
(b) performing rotational flow treatment on the screened slurry obtained in the step (a) in a cyclone, wherein the diameter of a rotational flow pipe is 100mm, and the operating pressure of the rotational flow treatment is 0.06MPa, so as to obtain first overflow slurry and first underflow slurry;
(c) performing cyclone treatment on the first underflow slurry obtained in the step (b) again, wherein the diameter of a cyclone pipe is 25mm, the operating pressure of the cyclone treatment is 0.06MPa, so as to obtain second overflow slurry and second underflow slurry, the second overflow slurry is mixed with the first overflow slurry obtained in the step (b), fine particles are obtained after filtering and drying, medium and coarse particles are obtained after filtering the second underflow slurry, and the medium and coarse particles are used as PAC (polyaluminium chloride) prepared basicity modifier;
(d) and (c) mixing the fine particles obtained in the step (c) with an inorganic cementing material, wherein the using amount of the inorganic cementing material is 0.5 wt% of that of the fine particles, sequentially carrying out forming treatment and sintering treatment, wherein the forming pressure is 100MPa, the forming time is 0.5min, the sintering temperature is 1200 ℃, and the sintering time is 60min, so as to obtain the activated calcium oxide.
In this example, the content of calcium oxide in the product obtained in step (d) is 94.0 wt%, and the metallurgical activity of the activated calcium oxide is found to be 369mL by using 4mol/L hydrochloric acid as an analysis reagent.
Example 2:
the embodiment provides a method for preparing active calcium oxide by using carbide slag, which comprises the following steps:
(a) preparing wet-process carbide slag into carbide slag slurry, wherein the solid content of the carbide slag slurry is 15 wt%, and then screening the carbide slag slurry in a vibrating screen, wherein the aperture of a screen hole of the vibrating screen is 0.5mm, so as to obtain coarse particles and screened slurry, wherein the coarse particles are used as ferrosilicon primary products;
(b) performing cyclone treatment on the screened slurry obtained in the step (a) in a cyclone, wherein the diameter of a cyclone pipe is 200mm, and the operating pressure of the cyclone treatment is 0.09MPa, so as to obtain first overflow slurry and first underflow slurry;
(c) performing cyclone treatment on the first underflow slurry obtained in the step (b) again, wherein the diameter of a cyclone pipe is 50mm, the operating pressure of the cyclone treatment is 0.1MPa, so as to obtain second overflow slurry and second underflow slurry, the second overflow slurry is mixed with the first overflow slurry obtained in the step (b), fine particles are obtained after filtering and drying, medium and coarse particles are obtained after filtering the second underflow slurry, and the medium and coarse particles are used as PAC (polyaluminium chloride) prepared basicity modifier;
(d) and (c) mixing the fine particles obtained in the step (c) with an organic cementing material, wherein the using amount of the organic cementing material is 0.8 wt% of that of the fine particles, sequentially carrying out forming treatment and sintering treatment, wherein the forming pressure is 80MPa, the forming time is 0.6min, the sintering temperature is 1100 ℃, and the sintering time is 30min, so as to obtain the activated calcium oxide.
In this example, the content of calcium oxide in the product obtained in step (d) was 96.0 wt%, and the metallurgical activity of activated calcium oxide was found to be 388mL using 4mol/L hydrochloric acid as an analytical reagent.
Example 3:
the embodiment provides a method for preparing active calcium oxide by using carbide slag, which comprises the following steps:
(a) preparing wet-process carbide slag into carbide slag slurry, wherein the solid content of the carbide slag slurry is 30 wt%, and then screening the carbide slag slurry in a vibrating screen, wherein the aperture of a screen hole of the vibrating screen is 1.5mm, so as to obtain coarse particles and screened slurry, wherein the coarse particles are used as ferrosilicon primary products;
(b) performing cyclone treatment on the screened slurry obtained in the step (a) in a cyclone, wherein the diameter of a cyclone pipe is 300mm, and the operating pressure of the cyclone treatment is 0.12MPa, so as to obtain first overflow slurry and first underflow slurry;
(c) performing cyclone treatment on the first underflow slurry obtained in the step (b) again, wherein the diameter of a cyclone pipe is 75mm, the operating pressure of the cyclone treatment is 0.12MPa, so as to obtain second overflow slurry and second underflow slurry, the second overflow slurry is mixed with the first overflow slurry obtained in the step (b), fine particles are obtained after filtering and drying, medium and coarse particles are obtained after filtering the second underflow slurry, and the medium and coarse particles are used as PAC (polyaluminium chloride) prepared basicity modifier;
(d) and (c) mixing the fine particles obtained in the step (c) with an inorganic cementing material, wherein the using amount of the inorganic cementing material is 1 wt% of that of the fine particles, sequentially carrying out forming treatment and sintering treatment, wherein the forming pressure is 200MPa, the forming time is 1min, the sintering temperature is 1300 ℃, and the sintering time is 90min, so as to obtain the activated calcium oxide.
In this example, the content of calcium oxide in the product obtained in step (d) was 93.2 wt%, and the metallurgical activity of activated calcium oxide was 365mL measured using 4mol/L hydrochloric acid as an analytical reagent.
Example 4:
the embodiment provides a method for preparing active calcium oxide by using carbide slag, which comprises the following steps:
(a) preparing wet-process carbide slag into carbide slag slurry, wherein the solid content of the carbide slag slurry is 25 wt%, and then screening the carbide slag slurry in a vibrating screen, wherein the mesh size of the vibrating screen is 1.2mm, so as to obtain coarse particles and screened slurry, wherein the coarse particles are used as ferrosilicon primary products;
(b) performing rotational flow treatment on the screened slurry obtained in the step (a) in a cyclone, wherein the diameter of a rotational flow pipe is 150mm, and the operating pressure of the rotational flow treatment is 0.07MPa, so as to obtain first overflow slurry and first underflow slurry;
(c) performing cyclone treatment on the first underflow slurry obtained in the step (b) again, wherein the diameter of a cyclone pipe is 40mm, the operating pressure of the cyclone treatment is 0.08MPa, so as to obtain second overflow slurry and second underflow slurry, the second overflow slurry is mixed with the first overflow slurry obtained in the step (b), fine particles are obtained after filtering and drying, medium and coarse particles are obtained after filtering the second underflow slurry, and the medium and coarse particles are used as PAC (polyaluminium chloride) prepared basicity modifier;
(d) and (c) mixing the fine particles obtained in the step (c) with cellulose, wherein the dosage of the cellulose is 0.6 wt% of the dosage of the fine particles, and sequentially carrying out forming treatment and sintering treatment, wherein the forming pressure is 150MPa, the forming time is 0.8min, the sintering temperature is 1000 ℃, and the sintering time is 45min, so as to obtain the active calcium oxide.
In this example, the content of calcium oxide in the product obtained in step (d) was 92.5 wt%, and the metallurgical activity of activated calcium oxide was 362mL, as measured with 4mol/L hydrochloric acid as the analytical reagent.
Example 5:
the embodiment provides a method for preparing active calcium oxide by using carbide slag, which comprises the following steps:
(a) preparing wet-process carbide slag into carbide slag slurry, wherein the solid content of the carbide slag slurry is 20 wt%, and then screening the carbide slag slurry in a vibrating screen, wherein the aperture of a screen hole of the vibrating screen is 0.8mm, so as to obtain coarse particles and screened slurry, wherein the coarse particles are used as ferrosilicon primary products;
(b) performing cyclone treatment on the screened slurry obtained in the step (a) in a cyclone, wherein the diameter of a cyclone pipe is 250mm, and the operating pressure of the cyclone treatment is 0.09MPa, so as to obtain first overflow slurry and first underflow slurry;
(c) performing cyclone treatment on the first underflow slurry obtained in the step (b) again, wherein the diameter of a cyclone pipe is 60mm, the operating pressure of the cyclone treatment is 0.09MPa, so as to obtain second overflow slurry and second underflow slurry, the second overflow slurry is mixed with the first overflow slurry obtained in the step (b), fine particles are obtained after filtering and drying, medium and coarse particles are obtained after filtering the second underflow slurry, and the medium and coarse particles are used as PAC (polyaluminium chloride) prepared basicity modifier;
(d) and (c) mixing the fine particles obtained in the step (c) with an inorganic cementing material and an organic cementing material, wherein the total usage amount of the inorganic cementing material and the organic cementing material is 0.7 wt% of the usage amount of the fine particles, sequentially performing molding treatment and sintering treatment, wherein the molding pressure is 50MPa, the molding time is 0.9min, the sintering temperature is 1150 ℃, and the sintering time is 75min, so as to obtain the active calcium oxide.
In this example, the content of calcium oxide in the product obtained in step (d) was 95.0 wt%, and the metallurgical activity of the activated calcium oxide was 374mL, as measured with 4mol/L hydrochloric acid as the analytical reagent.
Example 6:
this example provides a process for preparing activated calcium oxide from carbide slag, which is described with reference to example 1, except that: the amount of the inorganic gelling material in step (d) is 0.4 wt% of the amount of the fine particles, i.e. the amount of the additive is relatively small.
In the embodiment, because the dosage of the additive is less, the forming effect under the same condition is poor, the strength before sintering is reduced, the metallurgical activity of calcium oxide is not easy to improve during sintering, the crushing degree of the product obtained after sintering is large, and the measured metallurgical activity degree of the activated calcium oxide is only 345mL by taking 4mol/L hydrochloric acid as an analysis reagent.
Example 7:
this example provides a process for preparing activated calcium oxide from carbide slag, which is described with reference to example 1, except that: the amount of the inorganic gelling material in step (d) is 1.1 wt% of the amount of the fine particles, i.e. the amount of the additive is larger.
In the embodiment, because the dosage of the additive is a little more, a large number of air holes are formed during roasting in the molding process under the same condition, so that the strength is reduced, and the obtained product takes 4mol/L hydrochloric acid as an analysis reagent, and the measured metallurgical activity of the activated calcium oxide is only 342 mL.
Example 8:
this example provides a process for preparing activated calcium oxide from carbide slag, which is described with reference to example 1, except that: the sintering temperature in the step (d) is 950 ℃, namely the sintering temperature is lower.
In the embodiment, because the sintering temperature is relatively low, calcium hydroxide can not be completely converted into calcium oxide during roasting, the content of calcium oxide in the obtained product is reduced to 88 wt%, and the metallurgical activity of the active calcium oxide is only 346mL by taking 4mol/L hydrochloric acid as an analysis reagent.
Example 9:
this example provides a process for preparing activated calcium oxide from carbide slag, which is described with reference to example 1, except that: in the step (d), the sintering temperature is 1350 ℃, namely, the sintering temperature is higher.
In the embodiment, because the sintering temperature is relatively high, the active calcium oxide product obtained after roasting is hardened, the specific surface area is reduced, the number of active sites is correspondingly reduced, and even if the content of calcium oxide in the product is 95 wt%, the metallurgical activity of the active calcium oxide is only 338mL by taking 4mol/L hydrochloric acid as an analysis reagent.
Comparative example 1:
this comparative example provides a process for preparing activated calcium oxide using carbide slag, which is referred to example 1, with the only difference that: and (d) directly carrying out molding treatment and sintering treatment on the fine particles without adding an inorganic cementing material.
In the comparative example, because no additive is added into the fine particles, the forming effect is poor, the activity of the calcium oxide is not easy to improve during roasting, and the metallurgical activity of the active calcium oxide is only 318mL measured by taking 4mol/L hydrochloric acid as an analysis reagent.
By integrating the embodiment and the comparative example, the method provided by the invention can be used for directly separating the carbide slag according to coarse particles, medium coarse particles and fine particles by screening and cyclone treatment on the wet carbide slag, the particles with different particle size ranges are separated more thoroughly, the resource utilization of the carbide slag is realized, the content of calcium oxide in the product obtained from the fine particles can reach more than 92.5 wt%, and the metallurgical activity can reach more than 360 mL; 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.
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 (10)
1. A method for preparing active calcium oxide by using carbide slag is characterized by comprising the following steps:
(a) preparing carbide slag into carbide slag slurry, and then screening to obtain coarse particles and screened slurry;
(b) performing cyclone treatment on the screened slurry obtained in the step (a), wherein the diameter of a cyclone pipe used in the cyclone treatment is 100-300 mm, and the operating pressure is 0.06-0.12 MPa, so as to obtain first overflow slurry and first underflow slurry;
(c) performing cyclone treatment on the first underflow slurry obtained in the step (b) again, wherein the diameter of a cyclone pipe used in the cyclone treatment is 25-75 mm, the operating pressure is 0.06-0.12 MPa, so as to obtain second overflow slurry and second underflow slurry, the second overflow slurry is mixed with the first overflow slurry obtained in the step (b), solid-liquid separation is performed, so as to obtain fine particles, and the second underflow slurry is subjected to solid-liquid separation, so as to obtain medium coarse particles;
(d) and (c) mixing the fine particles obtained in the step (c) with an additive, wherein the additive comprises any one or a combination of at least two of an inorganic cementing material, an organic cementing material and cellulose, the dosage of the additive is 0.5-1 wt% of the dosage of the corresponding fine particles, molding treatment and sintering treatment are sequentially carried out, the pressure of the molding treatment is 50-200 MPa, and the time is 0.5-1 min, so that the active calcium oxide is obtained.
2. The method of claim 1, wherein the carbide slag of step (a) is produced from a wet acetylene production process.
3. The method of claim 1, wherein the carbide slag slurry of step (a) has a solids content of 10-30 wt%.
4. The method of claim 1, wherein the screening process of step (a) is performed in a vibratory screen.
5. The method according to claim 4, wherein the sieve has a mesh size of 0.5 to 1.5 mm.
6. The method of claim 1, wherein the swirling process of steps (b) and (c) is performed in a cyclone.
7. The method of claim 1, wherein the coarse particles of step (a) are used as a ferrosilicon primary product.
8. The method of claim 1, wherein the coarse particles of step (c) are used as a modifier of salt basicity in the production of aluminum polychloride.
9. The method according to claim 1, wherein the sintering treatment is carried out at a temperature of 1000 to 1300 ℃ for 20 to 90 min.
10. Method according to any of claims 1-9, characterized in that the method comprises the steps of:
(a) preparing carbide slag into carbide slag slurry, wherein the solid content of the carbide slag slurry is 10-30 wt%, and then screening the carbide slag slurry in a vibrating screen, wherein the aperture of a screen hole of the vibrating screen is 0.5-1.5 mm, so as to obtain coarse particles and screened slurry, wherein the coarse particles are used as ferrosilicon primary products;
(b) performing cyclone treatment on the screened slurry obtained in the step (a) in a cyclone, wherein the diameter of a cyclone tube in the cyclone is 100-300 mm, and the operating pressure of the cyclone treatment is 0.06-0.12 MPa, so as to obtain first overflow slurry and first underflow slurry;
(c) performing cyclone treatment on the first underflow slurry obtained in the step (b) again, wherein the diameter of a cyclone pipe is 25-75 mm, the operating pressure of the cyclone treatment is 0.06-0.12 MPa, so as to obtain second overflow slurry and second underflow slurry, the second overflow slurry is mixed with the first overflow slurry obtained in the step (b), solid-liquid separation is performed, so as to obtain fine particles, medium coarse particles are obtained after the solid-liquid separation of the second underflow slurry, and the medium coarse particles are used as a basicity regulator in the preparation process of the polyaluminium chloride;
(d) and (c) mixing the fine particles obtained in the step (c) with an additive, wherein the dosage of the additive is 0.5-1 wt% of the dosage of the fine particles, sequentially carrying out forming treatment and sintering treatment, wherein the forming treatment pressure is 50-200 MPa, the forming treatment time is 0.5-1 min, the sintering treatment temperature is 1000-1300 ℃, and the sintering treatment time is 20-90 min, so as to obtain the active calcium oxide.
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| CN111717916B (en) * | 2020-06-03 | 2024-04-12 | 新疆中泰创安环境科技股份有限公司 | Method and device for producing active calcium oxide as calcium carbide raw material by wet method calcium carbide slag |
| CN112010336B (en) * | 2020-08-25 | 2021-12-03 | 中国科学院过程工程研究所 | Method for preparing industrial calcium oxide for calcium carbide from calcium carbide slag |
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| CN102225780B (en) * | 2011-04-19 | 2013-08-28 | 上海彭浦冶金辅料有限公司 | High-activity calcium oxide and production method thereof |
| CN103288116B (en) * | 2013-05-15 | 2015-04-01 | 中国科学院过程工程研究所 | Method for preparing high-purity calcium hydroxide from carbide slag |
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| CN105948091B (en) * | 2016-05-12 | 2018-06-05 | 新疆中泰创安环境科技股份有限公司 | Using carbide slag as active calcium oxide, desulfurizing agent, carbide raw material of raw material and preparation method thereof |
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