CN109650429B - Carbide slag recycling treatment process - Google Patents
Carbide slag recycling treatment process Download PDFInfo
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- CN109650429B CN109650429B CN201910127692.9A CN201910127692A CN109650429B CN 109650429 B CN109650429 B CN 109650429B CN 201910127692 A CN201910127692 A CN 201910127692A CN 109650429 B CN109650429 B CN 109650429B
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Abstract
The invention relates to the technical field of coal chemical industry, in particular to a carbide slag recycling treatment process, which comprises the following steps of 1) preprocessing; step 2), coarse filtration by using a screen; step 3), cyclone separation; step 4), refining; step 5), press filtering; step 6), drying; step 7), cyclone separation; step 8) two-stage calcination; step 9), pressing the ball; and 10) screening and packaging. According to the invention, impurities in the carbide slag can be effectively separated, the carbide slag can be flexibly prepared into calcium hydroxide or calcium oxide according to market demands, the method is suitable for industrial large-batch continuous production, the energy consumption is low, the application range is wide, the prepared calcium hydroxide or calcium oxide product has high purity and excellent activity, and the waste recycling is realized.
Description
Technical Field
The invention relates to the technical field of coal chemical industry, in particular to a carbide slag recycling treatment process.
Background
The carbide slag mainly comes from the production of chemical products such as polyvinyl chloride (PVC), acetylene, polyvinyl alcohol and the like, belongs to II-class general industrial solid waste, is common in the PVC production and steelmaking industry, mainly comprises Ca (OH)2 accounting for 70-80 percent, and comprises MgO and Fe as other components2O3、SiO2、Al2O3And the like. Because the carbide slag has large fineness, is easy to scatter and pollute the air, has large alkalinity and strong corrosivity, is easy to pollute soil and underground water, and becomes a serious problem in the current environment-friendly solid waste treatment.
At present, the main method for comprehensively utilizing the carbide slag is used for producing cement, CN201510978157.6 discloses a device and a method for preparing the cement by using dry and wet carbide slag together, and CN201410577489.9 discloses a method for preparing cement clinker by using the carbide slag as a raw material, the cement quality is improved by using a mixing method, but impurities in the carbide slag are not removed, and the lime quality is influenced. Besides being used for producing cement, the carbide slag can also be used as a sulfur dioxide absorbent, such as used in the flue gas desulfurization, dust removal and purification process of a power plant; in the aspect of sewage treatment, the carbide slag has good application effect in treating coal washing wastewater, high-fluorine wastewater and strong acid wastewater, but the consumption is limited, and the consumption of the carbide slag is influenced by the consideration of transportation cost. Patents CN200810068715.5 and CN200910041209.1 disclose methods for preparing ultrafine calcium carbonate from carbide slag, but the production process is complex, the cost is high, and the industrialization difficulty is large.
The comprehensive utilization of the carbide slag needs to deal with the contradiction between impurity separation and cost reduction. CN103288116A discloses a method for preparing high-purity calcium hydroxide by using carbide slag, which proposes that impurities in the carbide slag are separated by using a hydrocyclone separation method, and that hydrocyclones with different diameters are used for separating the impurities in series and in parallel, so that the effect is good, but the method is still in a pilot stage, and factors influencing the impurity removal effect of the hydrocyclone separator include a cone angle, an operating pressure, a feeding port, an overflow aperture and the like besides the diameter.
Disclosure of Invention
The invention aims to provide a recycling treatment process for carbide slag, which can flexibly prepare the carbide slag into calcium hydroxide or calcium oxide according to market requirements by effectively separating impurities in the carbide slag, can be suitable for industrial large-batch continuous production, and has the advantages of low energy consumption and wide application range.
The purpose of the invention is realized as follows: a carbide slag recycling treatment process comprises the following steps of 1) pretreatment: mixing the carbide slag powder with water to prepare carbide slag suspension with 10-20% of carbide slag solid content, and uniformly stirring the carbide slag suspension at the stirring speed of 200-; step 2) screen rough filtration: filtering the uniformly stirred carbide slag suspension through a screen with 18-80 meshes to form carbide slag prefabricated slurry; step 3) cyclone separation: injecting the carbide slag pre-slurry filtered by the screen mesh into a hydraulic solid-liquid two-phase separator, and performing cyclone separation on the carbide slag pre-slurry by the hydraulic solid-liquid two-phase separator; step 4), refining: introducing the primary slurry flowing out of the overflow port of the hydrocyclone separator into a refining tank, refining the slurry, a complexing agent and a reducing agent in a mode of adding the complexing agent and the reducing agent into the refining tank and then uniformly stirring, wherein the respective specific gravities of the complexing agent and the reducing agent relative to the primary slurry are determined by that the pH value of the carbide slag slurry added with the complexing agent and the reducing agent serving as adjuvants reaches 9-11.5, the stirring speed is 100 plus materials and 200r/min, and the stirring time is 5-10 min; step 5), pressure filtration: filter-pressing the refined primary slurry in a plate-and-frame filtration mode to form a carbide slag mud cake and controlling the water content of the carbide slag mud cake to be less than or equal to 30 percent; step 6), drying: drying the pressed carbide slag mud cake until the water content is less than or equal to 5 percent and the mud cake is decomposed into unshaped calcium hydroxide powder, wherein the drying temperature is 200-500 ℃; and 7) quantitatively weighing and packaging the dried calcium hydroxide powder.
A carbide slag recycling treatment process comprises the following steps of 1) pretreatment: mixing the carbide slag powder with water to prepare carbide slag suspension with 10-20% of carbide slag solid content, and uniformly stirring the carbide slag suspension at the stirring speed of 200-; step 2) screen rough filtration: filtering the uniformly stirred carbide slag suspension through a screen with 18-80 meshes to form carbide slag prefabricated slurry; step 3) cyclone separation: injecting the carbide slag pre-slurry filtered by the screen mesh into a hydraulic solid-liquid two-phase separator, and performing cyclone separation on the carbide slag pre-slurry by the hydraulic solid-liquid two-phase separator; step 4), refining: introducing the primary slurry flowing out of the overflow port of the hydrocyclone separator into a refining tank, refining the slurry, a complexing agent and a reducing agent in a mode of adding the complexing agent and the reducing agent into the refining tank and then uniformly stirring, wherein the respective specific gravities of the complexing agent and the reducing agent relative to the primary slurry are determined by that the pH value of the carbide slag slurry added with the complexing agent and the reducing agent serving as adjuvants reaches 9-11.5, the stirring speed is 100 plus materials and 200r/min, and the stirring time is 5-10 min; step 5), pressure filtration: filter-pressing the refined primary slurry in a plate-and-frame filtration mode to form a carbide slag mud cake and controlling the water content of the carbide slag mud cake to be less than or equal to 30 percent; step 6), drying: drying the pressed carbide slag mud cake until the water content is less than or equal to 5 percent and the mud cake is decomposed into unshaped calcium hydroxide powder, wherein the drying temperature is 200-500 ℃; step 7) cyclone separation: feeding the dried calcium hydroxide powder into a cyclone separator, removing gravel and dust particles with large specific gravity contained in the calcium hydroxide powder through the cyclone separator, and collecting the calcium hydroxide powder which is discharged from the cyclone separator, is separated from the gravel and dust particles and has small specific gravity; step 8) two-stage calcination: immediately feeding the calcium hydroxide powder into a kiln for calcination, and implementing a calcination process on the calcium hydroxide powder to sequentially perform primary calcination and secondary calcination to generate calcium oxide powder: the primary calcination temperature is 500-800 ℃ and the calcination time is 60-120 min, and the secondary calcination temperature is 800-1000 ℃ and the calcination time is 120-180 min; step 9) pressing balls: cooling the calcium oxide powder generated by two-stage calcination to the temperature of 100-150 ℃, adding a neutral binder with the specific gravity of 0.1 percent relative to the calcium oxide powder, and then sending the calcium oxide powder into a ball press machine to press the calcium oxide powder into balls by two times of pressurization in sequence, wherein the first pressurization pressure is 5-10Mpa, and the second pressurization pressure is 15-20 Mpa; step 10), screening and packaging: and screening the calcium oxide spheres pressed into the spherical shape to remove non-spherical calcium oxide blocks, and quantitatively weighing and packaging the carbide slag spheres.
The invention mainly obtains the following two products:
(1) calcium hydroxide product
The high-quality calcium hydroxide is firstly subjected to coarse filtration by a screen to remove large-particle impurities, then is subjected to removal of nearly 85% of impurities by a specially designed hydraulic cyclone separator (a hydraulic solid-liquid two-phase separator (ZL 201110307534.5)), and is further refined to remove Mg in slurry2+、A13+、Fe3+Plasma, and press-filtering and drying to obtain the finished product, wherein the effective substance of the high-quality calcium hydroxide product is more than or equal to 90 percent and reaches the national chemical industry standard industrial calcium hydroxide HG/T4120-2009.
(2) Calcium oxide product
The calcium oxide further removes gravel and dust in the carbide slag through efficient rotary separation on the basis of production of high-quality calcium hydroxide products, has higher purity, improves the activity of the final calcium oxide product by reducing the calcination temperature and shortening the calcination time, improves the balling rate of the calcium oxide product through a secondary ball pressing process, has obvious qualification rate advantage, and can directly replace calcium carbide.
Compared with the prior carbide slag recycling treatment process, the invention has the technical advantages and uniqueness that: (1) the invention optimizes the traditional hydraulic cyclone separator, namely adopts a product of the granted patent, namely a hydraulic solid-liquid two-phase separator (ZL 201110307534.5), and adds a steady flow overflow plate and a gill type filtering separator on the basis of the traditional hydraulic cyclone separator, thereby improving the impurity separation effect of the traditional hydraulic cyclone separator; the upper part in the cylindrical barrel of the hydraulic solid-liquid two-phase separator is provided with a flat and inclined steady flow rotary overflow plate which is in an inclined state, gill-type filtering separators are uniformly distributed in the middle in the cylindrical barrel of the hydraulic solid-liquid two-phase separator, each gill-type filtering separator consists of a cubic tubular box body and gill sheets, and the gill sheets are uniformly distributed and parallel to each other; the sizes of relevant devices in the hydraulic solid-liquid two-phase separator adopted by the invention are as follows: the inner diameter of the cylindrical barrel is 1-1.5m, the sand discharge funnel is in an inverted cone shape, the cone angle of the sand discharge funnel is 15-25 degrees, the included angle between the steady flow rotary overflow plate and the horizontal plane is more than or equal to 1 degree and less than or equal to 5 degrees, the inner diameter of the inner vortex water lifting barrel is 200mm, the cheek piece thickness is 2-3mm, and the distance between two adjacent cheek pieces is 15-25 cm; when the hydraulic solid-liquid two-phase separator works, the pressure of working water pressure applied to the interior of the hydraulic solid-liquid two-phase separator through a water inlet pipe is 0.15-0.3 MPa; (2) the step of reducing calcium oxide by calcium hydroxide adopts secondary calcination, so that the calcination temperature is reduced, the calcination time is shortened, the performance of the generated calcium oxide is improved, the energy consumption is reduced, and the cost is reduced; (3) the invention adopts the manufacturing process of firstly calcining and then pressing the balls, compared with the process of firstly pressing the balls and then calcining, the invention reduces the ball explosion loss in the calcining process, and adopts the secondary ball pressing process, the ball forming rate is greatly improved, broken balls (irregular blocks which are not spherical) basically do not exist, the ball forming strength is high, the calcium oxide ball body is further ensured not to be broken, and the foundation is laid for the regeneration of calcium oxide as calcium carbide; (4) the method is suitable for industrial mass continuous production, calcium hydroxide or calcium oxide can be produced by selecting the calcium carbide slag according to market requirements, the purity of the recovered calcium hydroxide can reach more than 85%, the purity of the prepared calcium oxide can reach more than 90%, the activity of the calcium oxide is excellent, and the calcium oxide can be directly used as a production raw material of the calcium carbide to realize waste utilization.
The method can utilize the carbide slag as resources, can flexibly prepare the carbide slag into calcium hydroxide or calcium oxide according to market requirements by effectively separating impurities in the carbide slag, can be suitable for industrial large-batch continuous production, has small energy consumption and wide application range, and can prepare the calcium hydroxide or calcium oxide with high purity and excellent activity and realize waste recycling.
Detailed Description
A carbide slag recycling treatment process comprises the following steps of 1) pretreatment: mixing the carbide slag powder with water to prepare carbide slag suspension with 10-20% of carbide slag solid content, and uniformly stirring the carbide slag suspension at the stirring speed of 200-; step 2) screen rough filtration: filtering the uniformly stirred carbide slag suspension through a screen of 18-80 meshes (0.1-0.2 mu m) to form carbide slag prefabricated slurry; step 3) cyclone separation: injecting the carbide slag pre-slurry filtered by the screen mesh into a hydraulic solid-liquid two-phase separator, and performing cyclone separation on the carbide slag pre-slurry by the hydraulic solid-liquid two-phase separator; step 4), refining: introducing the primary slurry flowing out of the overflow port of the hydrocyclone separator into a refining tank, refining the slurry, a complexing agent and a reducing agent in a mode of adding the complexing agent and the reducing agent into the refining tank and then uniformly stirring, wherein the respective specific gravities of the complexing agent and the reducing agent relative to the primary slurry are determined by that the pH value of the carbide slag slurry added with the complexing agent and the reducing agent serving as adjuvants reaches 9-11.5, the stirring speed is 100 plus materials and 200r/min, and the stirring time is 5-10 min; step 5), pressure filtration: filter-pressing the refined primary slurry in a plate-and-frame filtration mode to form a carbide slag mud cake and controlling the water content of the carbide slag mud cake to be less than or equal to 30 percent; step 6), drying: drying the pressed carbide slag mud cake until the water content is less than or equal to 5 percent and the mud cake is decomposed into unshaped calcium hydroxide powder, wherein the drying temperature is 200-500 ℃; and 7) quantitatively weighing and packaging the dried calcium hydroxide powder.
A carbide slag recycling treatment process comprises the following steps of 1) pretreatment: mixing the carbide slag powder with water to prepare carbide slag suspension with 10-20% of carbide slag solid content, and uniformly stirring the carbide slag suspension at the stirring speed of 200-; step 2) screen rough filtration: filtering the uniformly stirred carbide slag suspension through a screen of 18-80 meshes (0.1-0.2 mu m) to form carbide slag prefabricated slurry; step 3) cyclone separation: injecting the carbide slag pre-slurry filtered by the screen mesh into a hydraulic solid-liquid two-phase separator, and performing cyclone separation on the carbide slag pre-slurry by the hydraulic solid-liquid two-phase separator; step 4), refining: introducing the primary slurry flowing out of the overflow port of the hydrocyclone separator into a refining tank, refining the slurry, a complexing agent and a reducing agent in a mode of adding the complexing agent and the reducing agent into the refining tank and then uniformly stirring, wherein the respective specific gravities of the complexing agent and the reducing agent relative to the primary slurry are determined by that the pH value of the carbide slag slurry added with the complexing agent and the reducing agent serving as adjuvants reaches 9-11.5, the stirring speed is 100 plus materials and 200r/min, and the stirring time is 5-10 min; step 5), pressure filtration: filter-pressing the refined primary slurry in a plate-and-frame filtration mode to form a carbide slag mud cake and controlling the water content of the carbide slag mud cake to be less than or equal to 30 percent; step 6), drying: drying the pressed carbide slag mud cake until the water content is less than or equal to 5 percent and the mud cake is decomposed into unshaped calcium hydroxide powder, wherein the drying temperature is 200-500 ℃; step 7) cyclone separation: feeding the dried calcium hydroxide powder into a cyclone separator, removing gravel and dust particles with large specific gravity contained in the calcium hydroxide powder through the cyclone separator, and collecting the calcium hydroxide powder which is discharged from the cyclone separator, is separated from the gravel and dust particles and has small specific gravity; step 8) two-stage calcination: immediately feeding the calcium hydroxide powder into a kiln for calcination, and implementing a calcination process on the calcium hydroxide powder to sequentially perform primary calcination and secondary calcination to generate calcium oxide powder: the primary calcination temperature is 500-800 ℃ and the calcination time is 60-120 min, and the secondary calcination temperature is 800-1000 ℃ and the calcination time is 120-180 min; step 9) pressing balls: cooling the calcium oxide powder generated by two-stage calcination to the temperature of 100-150 ℃, adding a neutral binder with the specific gravity of 0.1 percent relative to the calcium oxide powder, and then sending the calcium oxide powder into a ball press machine to press the calcium oxide powder into balls by two times of pressurization in sequence, wherein the first pressurization pressure is 5-10Mpa, and the second pressurization pressure is 15-20 Mpa; step 10), screening and packaging: and screening the calcium oxide spheres pressed into the spherical shape to remove non-spherical calcium oxide blocks, and quantitatively weighing and packaging the carbide slag spheres.
Inventive example 1
A carbide slag recycling treatment process comprises the following steps: step 1) pretreatment: mixing the carbide slag with water to prepare suspension with the solid content of 10%, and uniformly stirring at the stirring speed of 200r/min for 15 min. Step 2) screen rough filtration: and (3) enabling the carbide slag suspension uniformly stirred in the step 1) to pass through an 18-mesh (0.1 mu m) screen in a single direction to obtain the carbide slag pre-prepared slurry. Step 3) cyclone separation: and (3) introducing the carbide slag pre-prepared slurry coarsely filtered by the screen in the step 2) into a hydraulic solid-liquid two-phase separator, and performing cyclone separation on the carbide slag pre-prepared slurry. The sizes of relevant devices in the hydraulic solid-liquid two-phase separator are as follows: the diameter of the cylindrical barrel is 1.5m, the cone angle of the sand discharge funnel is 15 degrees, the inner diameter of the inner swirling flow water rising barrel is 200mm, and the hydraulic solid-liquid two-phase water passes throughThe pressure of working water applied to the interior of the separator by a water inlet pipe is 0.15MPa, the included angle between the steady flow rotary overflow plate and the horizontal plane is 5 degrees, the thickness of each cheek piece is 3mm, and the distance between every two adjacent cheek pieces is 25 cm. Step 4), refining: and (3) introducing the primary slurry flowing out of the overflow port of the hydrocyclone adopted in the step 3) into a refining tank, adding a complexing agent and a reducing agent, uniformly stirring the primary slurry mixed with the complexing agent and the reducing agent in the refining tank, adjusting the pH value of the primary slurry to 10.2, stirring at the rotating speed of 100r/min, and stirring for 5 min. Step 5), pressure filtration: and (3) carrying out plate-and-frame filtration on the carbide slag slurry refined in the step 4) to form a carbide slag mud cake after the carbide slag slurry is subjected to plate-and-frame filtration, wherein the water content of the carbide slag mud cake is less than or equal to 25%. Step 6), drying: and (3) drying the carbide slag mud cake which is subjected to pressure filtration in the step 5) at the drying temperature of 300 ℃ until the water content is less than or equal to 5%, drying the carbide slag mud cake to form a calcium hydroxide product, and then weighing and packaging the calcium hydroxide product quantitatively. The purity of the calcium hydroxide product prepared in example 1 was 92.8%, and the yield was 85.7%. Compared with the calcium hydroxide product, the calcium hydroxide product contains impurity components of SiO compared with the carbide slag raw slag2The percentage content is reduced from 9.84% to 2.23%, the percentage content of Al2O3 is reduced from 3.24% to 0.62%, the percentage content of Fe2O3 is reduced from 3.78% to 0.83%, the percentage content of MgO is reduced from 1.67% to 0.20%, the percentage content of C is reduced from 3.82% to 1.54%, and the content of residual impurities is 1.78%.
Inventive example 2
A carbide slag recycling treatment process comprises the following steps:
step 1) pretreatment: mixing the carbide slag with water to prepare suspension with the solid content of 15%, and uniformly stirring at the stirring speed of 300r/min for 20 min. Step 2) screen rough filtration: and (3) enabling the carbide slag suspension uniformly stirred in the step 1) to pass through an 80-mesh (0.2-micron) screen in a single direction to obtain carbide slag pre-prepared slurry. Step 3) cyclone separation: and (3) introducing the carbide slag pre-prepared slurry coarsely filtered by the screen in the step 2) into a hydraulic solid-liquid two-phase separator, and performing cyclone separation on the carbide slag pre-prepared slurry. The sizes of relevant devices in the hydraulic solid-liquid two-phase separator are as follows: the diameter of the cylindrical barrel is 1.5m, the cone angle of the sand discharge funnel is 15 degrees, the inner diameter of the inner swirling flow water lifting barrel is 200mm, the working water pressure applied to the inner portion of the inner swirling flow water lifting barrel through a water inlet pipe of the hydraulic solid-liquid two-phase separator is 0.15MPa, the included angle between the steady flow rotary overflow plate and the horizontal plane is 5 degrees, the thickness of each cheek piece is 3mm, and the distance between every two adjacent cheek pieces is 20 cm. Step 4), refining: and (3) introducing the primary slurry flowing out of the overflow port of the hydrocyclone adopted in the step 3) into a refining tank, adding a complexing agent and a reducing agent, uniformly stirring the primary slurry mixed with the complexing agent and the reducing agent in the refining tank, adjusting the pH value of the primary slurry to 11, and stirring at a rotation speed of 200r/min for 10 min. Step 5), pressure filtration: and (3) carrying out plate-and-frame filtration on the carbide slag slurry refined in the step 4) to form a carbide slag mud cake after the carbide slag slurry is subjected to plate-and-frame filtration, wherein the water content of the carbide slag mud cake is less than or equal to 30%. Step 6), drying: and (3) drying the carbide slag mud cake which is subjected to pressure filtration in the step 5) at the drying temperature of 500 ℃ until the water content is less than or equal to 5%. Step 7) cyclone separation: and (3) feeding the carbide slag powder (calcium hydroxide powder) dried in the step 6) into a cyclone separator, removing gravel and dust in the carbide slag powder, and collecting the calcium hydroxide powder discharged from the cyclone separator. Step 8) two-stage calcination: immediately feeding the calcium hydroxide powder into a kiln for calcination, and performing primary calcination and secondary calcination, wherein the calcination process adopts two-stage calcination, the primary calcination temperature is 800 ℃ and the calcination time is 120min, and the secondary calcination temperature is 800 ℃ and the calcination time is 120 min. Step 9) pressing balls: cooling the calcium oxide powder generated by the two-stage calcination in the step 8) to 100 ℃, adding 0.1% of neutral binder, feeding the calcium oxide powder into a ball press, and pressing the calcium oxide powder into balls by two times of pressurization, wherein the first ball press pressure is 10MPa, and the second ball press pressure is 20 MPa. Step 10), screening and packaging: screening the calcium oxide spheres pressed in the step 9), removing non-spherical calcium oxide blocks (broken spheres), and quantitatively weighing and packaging the calcium oxide spheres.
The purity of the calcium oxide product prepared in example 2 is 93.6%, and the yield is 83.4%.
According to the above embodiments of the present invention, those skilled in the art can fully realize the full scope of the present invention, and the realization process and method are the same as those of the above embodiments; and the invention has not been described in detail so as not to obscure the present invention.
The above description is only a part of the embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (2)
1. A carbide slag recycling treatment process is characterized in that: step 1) pretreatment: mixing the carbide slag powder with water to prepare carbide slag suspension with 10-20% of carbide slag solid content, and uniformly stirring the carbide slag suspension at the stirring speed of 200-; step 2) screen rough filtration: filtering the uniformly stirred carbide slag suspension through a screen with 18-80 meshes to form carbide slag prefabricated slurry; step 3) cyclone separation: injecting the carbide slag pre-slurry filtered by the screen mesh into a hydraulic solid-liquid two-phase separator, and performing cyclone separation on the carbide slag pre-slurry by the hydraulic solid-liquid two-phase separator; step 4), refining: introducing the primary slurry flowing out of the overflow port of the hydraulic solid-liquid two-phase separator into a refining tank, adding a complexing agent and a reducing agent into the refining tank, and then refining the primary slurry, the complexing agent and the reducing agent in a uniform stirring manner, wherein the respective specific gravities of the complexing agent and the reducing agent relative to the primary slurry are determined by that the pH value of the carbide slag slurry added with the complexing agent and the reducing agent serving as adjuvants reaches 9-11.5, the stirring speed is 100 plus materials and 200r/min, and the stirring time is 5-10 min; step 5), pressure filtration: filter-pressing the refined primary slurry in a plate-and-frame filtration mode to form a carbide slag mud cake and controlling the water content of the carbide slag mud cake to be less than or equal to 30 percent; step 6), drying: drying the pressed carbide slag mud cake until the water content is less than or equal to 5 percent and the mud cake is decomposed into unshaped calcium hydroxide powder, wherein the drying temperature is 200-500 ℃; step 7), quantitatively weighing and packaging the dried calcium hydroxide powder; the upper part in the cylindrical barrel of the hydraulic solid-liquid two-phase separator is provided with a flat and inclined steady flow rotary overflow plate which is in an inclined state, gill-type filtering separators are uniformly distributed in the middle in the cylindrical barrel of the hydraulic solid-liquid two-phase separator, each gill-type filtering separator consists of a cubic tubular box body and gill sheets, and the gill sheets are uniformly distributed and parallel to each other; the sizes of relevant devices in the hydraulic solid-liquid two-phase separator are as follows: the inner diameter of the cylindrical barrel is 1-1.5m, the sand discharge funnel is in an inverted cone shape, the cone angle of the sand discharge funnel is 15-25 degrees, the included angle between the steady flow rotary overflow plate and the horizontal plane is more than or equal to 1 degree and less than or equal to 5 degrees, the inner diameter of the inner vortex water lifting barrel is 200mm, the cheek piece thickness is 2-3mm, and the distance between two adjacent cheek pieces is 15-25 cm; when the hydraulic solid-liquid two-phase separator works, the pressure of working water applied to the interior of the hydraulic solid-liquid two-phase separator through a water inlet pipe is 0.15-0.3 MPa.
2. A carbide slag recycling treatment process is characterized in that: step 1) pretreatment: mixing the carbide slag powder with water to prepare carbide slag suspension with 10-20% of carbide slag solid content, and uniformly stirring the carbide slag suspension at the stirring speed of 200-; step 2) screen rough filtration: filtering the uniformly stirred carbide slag suspension through a screen with 18-80 meshes to form carbide slag prefabricated slurry; step 3) cyclone separation: injecting the carbide slag pre-slurry filtered by the screen mesh into a hydraulic solid-liquid two-phase separator, and performing cyclone separation on the carbide slag pre-slurry by the hydraulic solid-liquid two-phase separator; step 4), refining: introducing the primary slurry flowing out of the overflow port of the hydraulic solid-liquid two-phase separator into a refining tank, adding a complexing agent and a reducing agent into the refining tank, and then refining the primary slurry, the complexing agent and the reducing agent in a uniform stirring manner, wherein the respective specific gravities of the complexing agent and the reducing agent relative to the primary slurry are determined by that the pH value of the carbide slag slurry added with the complexing agent and the reducing agent serving as adjuvants reaches 9-11.5, the stirring speed is 100 plus materials and 200r/min, and the stirring time is 5-10 min; step 5), pressure filtration: filter-pressing the refined primary slurry in a plate-and-frame filtration mode to form a carbide slag mud cake and controlling the water content of the carbide slag mud cake to be less than or equal to 30 percent; step 6), drying: drying the pressed carbide slag mud cake until the water content is less than or equal to 5 percent and the mud cake is decomposed into unshaped calcium hydroxide powder, wherein the drying temperature is 200-500 ℃; step 7) cyclone separation: feeding the dried calcium hydroxide powder into a cyclone separator, removing gravel and dust particles with large specific gravity contained in the calcium hydroxide powder through the cyclone separator, and collecting the calcium hydroxide powder which is discharged from the cyclone separator, is separated from the gravel and dust particles and has small specific gravity; step 8) two-stage calcination: immediately feeding the calcium hydroxide powder into a kiln for calcination, and implementing a calcination process on the calcium hydroxide powder to sequentially perform primary calcination and secondary calcination to generate calcium oxide powder: the primary calcination temperature is 500-800 ℃ and the calcination time is 60-120 min, and the secondary calcination temperature is 800-1000 ℃ and the calcination time is 120-180 min; step 9) pressing balls: cooling the calcium oxide powder generated by two-stage calcination to the temperature of 100-150 ℃, adding a neutral binder with the specific gravity of 0.1 percent relative to the calcium oxide powder, and then sending the calcium oxide powder into a ball press machine to press the calcium oxide powder into balls by two times of pressurization in sequence, wherein the first pressurization pressure is 5-10MPa, and the second pressurization pressure is 15-20 MPa; step 10), screening and packaging: screening the calcium oxide spheres pressed into the spherical shape to remove non-spherical calcium oxide blocks, and then quantitatively weighing and packaging the calcium oxide spheres; the upper part in the cylindrical barrel of the hydraulic solid-liquid two-phase separator is provided with a flat and inclined steady flow rotary overflow plate which is in an inclined state, gill-type filtering separators are uniformly distributed in the middle in the cylindrical barrel of the hydraulic solid-liquid two-phase separator, each gill-type filtering separator consists of a cubic tubular box body and gill sheets, and the gill sheets are uniformly distributed and parallel to each other; the sizes of relevant devices in the hydraulic solid-liquid two-phase separator are as follows: the inner diameter of the cylindrical barrel is 1-1.5m, the sand discharge funnel is in an inverted cone shape, the cone angle of the sand discharge funnel is 15-25 degrees, the included angle between the steady flow rotary overflow plate and the horizontal plane is more than or equal to 1 degree and less than or equal to 5 degrees, the inner diameter of the inner vortex water lifting barrel is 200mm, the cheek piece thickness is 2-3mm, and the distance between two adjacent cheek pieces is 15-25 cm; when the hydraulic solid-liquid two-phase separator works, the pressure of working water applied to the interior of the hydraulic solid-liquid two-phase separator through a water inlet pipe is 0.15-0.3 MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910127692.9A CN109650429B (en) | 2019-02-21 | 2019-02-21 | Carbide slag recycling treatment process |
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| CN110270432B (en) * | 2019-06-18 | 2021-07-27 | 西安建筑科技大学 | Method for removing non-calcareous mineral impurities in carbide slag |
| CN110759371A (en) * | 2019-12-04 | 2020-02-07 | 新疆国峰嘉和环保科技有限公司 | Method for preparing calcium oxide by purifying and recycling carbide slag |
| CN112456619A (en) * | 2020-10-13 | 2021-03-09 | 新疆中泰化学股份有限公司 | Method and device for producing water treatment regulator by using carbide slag |
| CN114684837B (en) * | 2020-12-30 | 2023-12-22 | 内蒙古亿利化学工业有限公司 | Recycling device and method for preparing active calcium oxide from calcium carbide slag as calcium carbide raw material |
| CN114291834A (en) * | 2022-01-05 | 2022-04-08 | 新疆圣雄电石有限公司 | Device for producing active calcium oxide by using wet-process carbide slag and using method |
| CN115286265A (en) * | 2022-08-05 | 2022-11-04 | 廖怀武 | Production method for producing calcium hydroxide by using waste carbide slag |
| CN115716649A (en) * | 2022-11-25 | 2023-02-28 | 安徽华塑股份有限公司 | Method for producing calcium carbide by recycling calcium carbide slag |
| CN116199433A (en) * | 2023-04-26 | 2023-06-02 | 中国科学院过程工程研究所 | Preparation method and application of calcium oxide |
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| CN101157471B (en) * | 2007-09-29 | 2010-12-01 | 株洲化工集团诚信有限公司 | Method and device for producing calcium lime by carbide slag |
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