Calcium carbide furnace purification ash treatment system

Abstract

The invention relates to a calcium carbide furnace purification ash treatment system, and belongs to the field of chemical waste treatment. Comprising a feeding mechanism, a preliminary reaction mechanism, a neutralization mechanism, a carbon powder discharging mechanism, a replacement reaction mechanism, a magnesium discharging mechanism, a calcium discharging mechanism, a discharging mechanism and a material circulating mechanism, the feeding mechanism is connected with the preliminary reaction mechanism, the preliminary reaction mechanism is connected with the neutralization mechanism, the neutralization mechanism is connected with the carbon powder discharging mechanism, the carbon powder discharging mechanism is connected with the replacement reaction mechanism, the replacement reaction mechanism is connected with the magnesium discharging mechanism, the magnesium discharging mechanism is connected with the calcium discharging mechanism, and the calcium discharging mechanism is connected with the discharging mechanism. The material circulating mechanism is connected with the calcium discharging mechanism, the primary reaction mechanism and the replacement reaction mechanism. According to the method, carbon powder, calcium oxide and magnesium oxide in the purified ash of the calcium carbide furnace can be separated, resource utilization is achieved, meanwhile, waste gas and waste water generated in the treatment process can be fully recovered and recycled, and pollution to the environment is avoided.

Description

Technical Field

[0001] The invention relates to the field of chemical waste treatment, and in particular to a calcium carbide furnace purification ash treatment system. Background Art

[0002] Calcium carbide furnace purification ash is a by-product produced in the process of calcium carbide production, which is mainly rich in calcium oxide, magnesium oxide and carbon powder components.

[0003] At present, one of the main ways to treat the purified ash from calcium carbide furnaces in industrial production is to use the purified ash as fuel, but this treatment method mainly utilizes the carbon powder component in the purified ash, and other components are not utilized; the second treatment method is to landfill the purified ash as solid waste, but this treatment method not only causes waste of resources, but also pollutes the surrounding environment. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a calcium carbide furnace purified ash processing system to solve the above-mentioned problem.

[0005] The technical solution of the present invention for solving the above technical problems is as follows: a calcium carbide furnace purified ash processing system comprises: a feeding mechanism, a preliminary reaction mechanism, a neutralization mechanism, a carbon powder discharge mechanism, a replacement reaction mechanism, a magnesium discharge mechanism, a calcium discharge mechanism, a feeding mechanism and a material circulation mechanism; the feeding mechanism is connected with the preliminary reaction mechanism to transport the purified ash to the preliminary reaction mechanism, the preliminary reaction mechanism is connected with the neutralization mechanism to neutralize the slurry after the reaction, the neutralization mechanism is connected with the carbon powder discharge mechanism to separate the carbon powder in the neutralized slurry, the carbon powder discharge mechanism is connected with the replacement reaction mechanism to perform a replacement reaction on the solution after the carbon powder is separated, the replacement reaction mechanism is connected with the magnesium discharge mechanism to separate the replaced magnesium hydroxide, the magnesium discharge mechanism is connected with the calcium discharge mechanism to separate the calcium chloride in the solution, the calcium discharge mechanism is connected with the feeding mechanism to discharge the separated calcium chloride, the material circulation mechanism is connected with the calcium discharge mechanism, the preliminary reaction mechanism and the replacement reaction mechanism to recycle the ammonium chloride and water in the solution.

[0006] The beneficial effects of the present invention are as follows: the calcium oxide, magnesium oxide and carbon powder in the calcium carbide furnace purification ash can be subjected to a preliminary reaction mechanism and a neutralization mechanism to obtain a neutral slurry of calcium chloride, magnesium chloride and carbon powder; the carbon powder discharge mechanism is conducive to separating the carbon powder in the slurry; the replacement reaction mechanism is conducive to converting calcium chloride and magnesium chloride into a calcium chloride solution and a magnesium hydroxide suspension; the magnesium discharge mechanism is conducive to separating the magnesium hydroxide suspension in the solution; the calcium discharge mechanism is conducive to separating calcium chloride from the solution and discharging it through the feeding mechanism; the material circulation mechanism is conducive to transporting the ammonium chloride and water retained in the calcium chloride solution back to the preliminary reaction mechanism and the replacement reaction mechanism for circulation and reaction; the present invention is conducive to the efficient separation of carbon powder, calcium oxide and magnesium oxide in the calcium carbide furnace purification ash, realizing high-value conversion and resource utilization of the calcium carbide furnace purification ash; at the same time, the waste gas and waste water generated in the treatment process can be fully recovered and recycled, thereby avoiding pollution to the environment.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the feeding mechanism includes a purified ash bin and a screw conveyor, the purified ash bin is connected to the screw conveyor, and the screw conveyor is connected to the preliminary reaction mechanism.

[0009] The beneficial effect of adopting the above further scheme is that the purified ash bin is conducive to storing the purified ash of the calcium carbide furnace, and the purified ash is evenly transported to the preliminary reaction mechanism through the screw conveyor.

[0010] Furthermore, the preliminary reaction mechanism includes: a reaction tank, a hydrochloric acid high-level tank and a waste gas purifier, the hydrochloric acid high-level tank and the waste gas purifier are both connected to the reaction tank, and the screw conveyor is connected to the reaction tank.

[0011] The beneficial effects of adopting the above further scheme are: the reaction tank is conducive to stirring the hydrochloric acid and the purified ash, and allowing them to fully react and dissolve, and the exhaust gas purifier is conducive to dissolving the exhaust gas generated by the reaction into industrial water and then inputting it into the reaction tank again to participate in the reaction, thereby avoiding direct discharge of exhaust gas to cause environmental pollution.

[0012] Furthermore, the neutralization mechanism includes an acid-base regulating tank and an ammonia high-level tank, the reaction tank and the ammonia high-level tank are both connected to the acid-base regulating tank, and the acid-base regulating tank is connected to the carbon powder discharge mechanism.

[0013] The beneficial effect of adopting the above further scheme is that the acid-base regulating tank is conducive to neutralizing the hydrochloric acid in the reaction tank.

[0014] Furthermore, the carbon powder discharge mechanism includes a first slurry pump and a first plate and frame filter press, the two ends of the first slurry pump are connected to the acid-base adjustment tank and the first plate and frame filter press in a one-to-one manner, and the two ends of the replacement reaction mechanism are connected to the first plate and frame filter press and the magnesium discharge mechanism in a one-to-one manner.

[0015] The beneficial effect of adopting the above further scheme is that the first slurry pump is conducive to transporting the neutralized slurry in the acid-base adjustment tank to the first plate and frame filter press, and the first plate and frame filter press is conducive to separating the carbon powder in the slurry.

[0016] Furthermore, the replacement reaction mechanism includes a mother liquor tank and a calcium hydroxide high-level tank, the first plate and frame filter press and the calcium hydroxide high-level tank are both connected to the mother liquor tank, and the mother liquor tank is connected to the magnesium discharge mechanism.

[0017] The beneficial effect of adopting the above further scheme is that the calcium hydroxide high-level tank is conducive to inputting calcium hydroxide into the mother liquor tank, reacting with the calcium chloride, magnesium chloride and ammonium chloride solutions after separating the carbon powder, forming a magnesium hydroxide suspension and calcium chloride and ammonium chloride solutions, thereby facilitating the separation of magnesium hydroxide.

[0018] Furthermore, the magnesium discharge mechanism includes a second slurry pump and a second plate-frame filter press, and two ends of the second slurry pump are connected to the mother liquor tank and the second plate-frame filter press in a one-to-one correspondence.

[0019] The beneficial effect of adopting the above further scheme is that the second slurry pump is conducive to inputting the magnesium hydroxide suspension and the calcium chloride and ammonium chloride solutions into the second plate and frame filter press, and the second plate and frame filter press is conducive to separating the magnesium hydroxide suspension.

[0020] Furthermore, the calcium discharge mechanism includes: a filtrate tank, a third slurry pump, a preconcentrator, a fluidized drying bed and a hot air furnace. The second plate and frame filter press in the magnesium discharge mechanism is connected to the filtrate tank, the filtrate tank is connected to the third slurry pump, the third slurry pump is connected to the preconcentrator, the preconcentrator and the hot air furnace are both connected to the fluidized drying bed, the fluidized drying bed is connected to the unloading mechanism and the material circulation mechanism, and the preconcentrator is connected to the material circulation mechanism.

[0021] The beneficial effects of adopting the above further scheme are: the filtrate tank is conducive to receiving the calcium chloride and ammonium chloride solutions after separation of magnesium hydroxide, the third slurry pump is conducive to inputting the calcium chloride and ammonium chloride solutions into the pre-concentrator for concentration, and the hot air furnace is conducive to providing heat for the fluidized drying bed to dry the concentrated calcium chloride solution to form calcium chloride solid.

[0022] Furthermore, the unloading mechanism includes an elevator and a calcium chloride silo, and the bottom and top ends of the elevator are connected to the fluidized drying bed and the calcium chloride silo in a one-to-one correspondence.

[0023] The beneficial effect of adopting the above further scheme is that the elevator is conducive to inputting the dried calcium chloride solid into the calcium chloride silo for storage and completing the subsequent packaging and transportation.

[0024] Furthermore, the material circulation mechanism includes a cyclone separator and a surface cooler, the cyclone separator is connected to the pre-concentrator, the fluidized drying bed and the mother liquor tank in the replacement reaction mechanism, and the surface cooler is connected to the pre-concentrator and the reaction tank in the preliminary reaction mechanism.

[0025] The beneficial effects of adopting the above further scheme are: the cyclone separator is conducive to separating the ammonium chloride gas and water vapor after being dried by the fluidized drying bed, and producing condensate, and at the same time the condensate is input into the mother liquor tank in the replacement reaction mechanism for recycling, the ammonium chloride gas is input into the pre-concentrator again, the surface cooler is conducive to condensing the ammonium chloride gas concentrated by the pre-concentrator to form ammonium chloride liquid, and transporting it back to the reaction tank in the preliminary reaction mechanism for recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present invention.

[0027] in, Figure 1 The arrows in the figure represent a schematic diagram of material transportation. The arrow at the top of the purified ash bin 11 represents the transportation of purified ash in the calcium carbide furnace to the purified ash bin 11. The arrow on the side of the exhaust gas purifier 23 represents the input of industrial water into the exhaust gas purifier 23 from the outside. The arrow pulled out from the top of the exhaust gas purifier 23 represents the discharge of water vapor in the exhaust gas purifier 23. The arrow below the first plate and frame filter press 42 represents the separated carbon powder. The arrow below the second plate and frame filter press 62 represents the separated magnesium hydroxide. The arrow below the calcium chloride silo 82 represents the unloading of calcium chloride. The arrow below the cyclone separator 91 represents the transportation of the separated water condensate back to the mother liquor tank 51. The arrow below the surface cooler 92 represents the transportation of the condensed ammonium chloride liquid back to the reaction tank 21. The arrow above the surface cooler 92 represents the discharge of water vapor in the surface cooler 92.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] 1. Feeding mechanism; 2. Preliminary reaction mechanism; 3. Neutralization mechanism; 4. Carbon powder discharge mechanism; 5. Replacement reaction mechanism; 6. Magnesium discharge mechanism; 7. Calcium discharge mechanism; 8. Unloading mechanism; 9. Material circulation mechanism; 11. Purification ash bin; 12. Screw conveyor; 21. Reaction tank; 22. Hydrochloric acid high-level tank; 23. Waste gas purifier; 31. Acid-base adjustment tank; 32. Ammonia high-level tank; 41. First slurry pump; 42. First plate and frame filter press; 51. Mother liquor tank; 52. Calcium hydroxide high-level tank; 61. Second slurry pump; 62. Second plate and frame filter press; 71. Filtrate tank; 72. Third slurry pump; 73. Pre-concentrator; 74. Fluidized drying bed; 75. Hot air furnace; 81. Elevator; 82. Calcium chloride silo; 91. Cyclone separator; 92. Surface cooler. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] like Figure 1 As shown, a calcium carbide furnace purified ash processing system includes: a feeding mechanism 1, a preliminary reaction mechanism 2, a neutralization mechanism 3, a carbon powder discharge mechanism 4, a replacement reaction mechanism 5, a magnesium discharge mechanism 6, a calcium discharge mechanism 7, a feeding mechanism 8 and a material circulation mechanism 9; the feeding mechanism 1 is connected to the preliminary reaction mechanism 2 to transport the purified ash to the preliminary reaction mechanism 2, the preliminary reaction mechanism 2 is connected to the neutralization mechanism 3 to neutralize the slurry after the reaction, the neutralization mechanism 3 is connected to the carbon powder discharge mechanism 4 to separate the carbon powder in the neutralized slurry, and the The carbon powder discharge mechanism 4 is connected to the replacement reaction mechanism 5 to perform a replacement reaction on the solution after the carbon powder is separated. The replacement reaction mechanism 5 is connected to the magnesium discharge mechanism 6 to separate the replaced magnesium hydroxide. The magnesium discharge mechanism 6 is connected to the calcium discharge mechanism 7 to separate the calcium chloride in the solution. The calcium discharge mechanism 7 is connected to the unloading mechanism 8 to unload the separated calcium chloride. The material circulation mechanism 9 is connected to the calcium discharge mechanism 7, the preliminary reaction mechanism 2 and the replacement reaction mechanism 5 to recycle the ammonium chloride and water in the solution.

[0032] The beneficial effects of the present invention are as follows: the calcium oxide, magnesium oxide and carbon powder in the calcium carbide furnace purification ash can be subjected to a preliminary reaction mechanism and a neutralization mechanism to obtain a neutral slurry of calcium chloride, magnesium chloride and carbon powder; the carbon powder discharge mechanism is conducive to separating the carbon powder in the slurry; the replacement reaction mechanism is conducive to converting calcium chloride and magnesium chloride into a calcium chloride solution and a magnesium hydroxide suspension; the magnesium discharge mechanism is conducive to separating the magnesium hydroxide suspension in the solution; the calcium discharge mechanism is conducive to separating calcium chloride from the solution and discharging it through the feeding mechanism; the material circulation mechanism is conducive to transporting the ammonium chloride and water retained in the calcium chloride solution back to the preliminary reaction mechanism and the replacement reaction mechanism for circulation and reaction; the present invention is conducive to the efficient separation of carbon powder, calcium oxide and magnesium oxide in the calcium carbide furnace purification ash, realizing high-value conversion and resource utilization of the calcium carbide furnace purification ash; at the same time, the waste gas and waste water generated in the treatment process can be fully recovered and recycled, thereby avoiding pollution to the environment.

[0033] Preferably, Figure 1 As shown, the feeding mechanism 1 includes a purified ash bin 11 and a screw conveyor 12 , the purified ash bin 11 is connected to the screw conveyor 12 , and the screw conveyor 12 is connected to the preliminary reaction mechanism 2 .

[0034] It should be noted that in the technical solution of the present invention, a star-shaped discharge valve is provided at the lower portion of the purified ash bin 11 , which is conducive to evenly discharging the purified ash in the purified ash bin 11 onto the screw conveyor 12 .

[0035] The beneficial effect of adopting the above preferred scheme is that the purified ash bin is conducive to storing the purified ash of the calcium carbide furnace, and the purified ash is evenly transported to the preliminary reaction mechanism through the screw conveyor.

[0036] Preferably, Figure 1 As shown, the preliminary reaction mechanism 2 includes: a reaction tank 21, a hydrochloric acid high-level tank 22 and a waste gas purifier 23, the hydrochloric acid high-level tank 22 and the waste gas purifier 23 are both connected to the reaction tank 21, and the screw conveyor 12 is connected to the reaction tank 21.

[0037] It should be noted that: in a preferred embodiment of the present invention, the ratio of the hydrochloric acid transported from the hydrochloric acid high-level tank 22 into the reaction tank 21 and the purified ash transported from the screw conveyor 12 into the reaction tank 21 is 1:3, and after the reaction, the reaction tank 21 contains a mixture of calcium chloride, magnesium chloride, carbon powder and hydrochloric acid.

[0038] The beneficial effects of adopting the above preferred scheme are: the reaction tank is conducive to stirring the hydrochloric acid and the purified ash, and allowing them to fully react and dissolve, and the exhaust gas purifier is conducive to dissolving the exhaust gas generated by the reaction into industrial water and then inputting it into the reaction tank again to participate in the reaction, thereby avoiding direct discharge of exhaust gas to cause environmental pollution.

[0039] Preferably, Figure 1 As shown, the neutralization mechanism 3 includes an acid-base regulating tank 31 and an ammonia high-level tank 32 , the reaction tank 21 and the ammonia high-level tank 32 are both connected to the acid-base regulating tank 31 , and the acid-base regulating tank 31 is connected to the carbon powder discharge mechanism 4 .

[0040] It should be noted that: in a preferred embodiment of the present invention, the ratio of ammonia water transported from the ammonia water high-level tank 32 into the acid-base adjusting tank 31 and the slurry transported from the reaction tank 21 into the acid-base adjusting tank 31 is 1:1, and after the reaction, the acid-base adjusting tank 31 contains a slurry of calcium chloride, magnesium chloride, ammonium chloride and carbon powder.

[0041] The beneficial effect of adopting the above preferred solution is that the acid-base adjustment tank is conducive to neutralizing the hydrochloric acid in the reaction tank.

[0042] Preferably, Figure 1 As shown, the carbon powder discharge mechanism 4 includes a first slurry pump 41 and a first plate and frame filter press 42, the two ends of the first slurry pump 41 are connected to the acid-base adjustment tank 31 and the first plate and frame filter press 42 one by one, and the two ends of the replacement reaction mechanism 5 are connected to the first plate and frame filter press 42 and the magnesium discharge mechanism 6 one by one.

[0043] The beneficial effect of adopting the above preferred scheme is that the first slurry pump is conducive to transporting the neutralized slurry in the acid-base adjustment tank to the first plate and frame filter press, and the first plate and frame filter press is conducive to separating the carbon powder in the slurry.

[0044] Preferably, Figure 1 As shown, the replacement reaction mechanism 5 includes a mother liquor tank 51 and a calcium hydroxide high-level tank 52 , the first plate and frame filter press 42 and the calcium hydroxide high-level tank 52 are both connected to the mother liquor tank 51 , and the mother liquor tank 51 is connected to the magnesium discharge mechanism 6 .

[0045] It should be noted that: in a preferred embodiment of the present invention, the ratio of calcium hydroxide transported from the calcium hydroxide high-level tank 52 into the mother liquor tank 51 to the solution transported from the first plate and frame filter press 42 into the mother liquor tank 51 is 1:1, and after the reaction, the mother liquor tank 51 contains calcium chloride, ammonium chloride solution and magnesium hydroxide suspension.

[0046] The beneficial effect of adopting the above preferred scheme is that the calcium hydroxide high-level tank is conducive to inputting calcium hydroxide into the mother liquor tank, reacting with the calcium chloride, magnesium chloride and ammonium chloride solutions after separating the carbon powder, forming a magnesium hydroxide suspension and calcium chloride and ammonium chloride solutions, thereby facilitating the separation of magnesium hydroxide.

[0047] Preferably, Figure 1 As shown, the magnesium discharge mechanism 6 includes a second slurry pump 61 and a second plate-frame filter press 62 , and both ends of the second slurry pump 61 are connected to the mother liquid tank 51 and the second plate-frame filter press 62 in a one-to-one correspondence.

[0048] The beneficial effect of adopting the above preferred scheme is that the second slurry pump is conducive to inputting the magnesium hydroxide suspension and the calcium chloride and ammonium chloride solutions into the second plate and frame filter press, and the second plate and frame filter press is conducive to separating the magnesium hydroxide suspension.

[0049] Preferably, Figure 1 As shown, the calcium discharge mechanism 7 includes: a filtrate tank 71, a third slurry pump 72, a pre-concentrator 73, a fluidized drying bed 74 and a hot air furnace 75. The second plate and frame filter press 62 in the magnesium discharge mechanism 6 is connected to the filtrate tank 71, the filtrate tank 71 is connected to the third slurry pump 72, the third slurry pump 72 is connected to the pre-concentrator 73, the pre-concentrator 73 and the hot air furnace 75 are both connected to the fluidized drying bed 74, the fluidized drying bed 74 is connected to the unloading mechanism 8 and the material circulation mechanism 9, and the pre-concentrator 73 is connected to the material circulation mechanism 9.

[0050] The beneficial effects of adopting the above preferred scheme are: the filtrate tank is conducive to receiving the calcium chloride and ammonium chloride solutions after separation of magnesium hydroxide, the third slurry pump is conducive to inputting the calcium chloride and ammonium chloride solutions into the pre-concentrator for concentration, and the hot air furnace is conducive to providing heat for the fluidized drying bed to dry the concentrated calcium chloride solution to form calcium chloride solid.

[0051] Preferably, Figure 1 As shown, the unloading mechanism 8 includes an elevator 81 and a calcium chloride silo 82, and the bottom end and the top end of the elevator 81 are connected to the fluidized drying bed 74 and the calcium chloride silo 82 in a one-to-one correspondence.

[0052] The beneficial effect of adopting the above preferred solution is that the elevator is conducive to inputting the dried calcium chloride solid into the calcium chloride silo for storage and completing the subsequent packaging and transportation.

[0053] Preferably, Figure 1 As shown, the material circulation mechanism 9 includes a cyclone separator 91 and a surface cooler 92. The cyclone separator 91 is connected to the pre-concentrator 73, the fluidized drying bed 74 and the mother liquor tank 51 in the replacement reaction mechanism 5. The surface cooler 92 is connected to the pre-concentrator 73 and the reaction tank 21 in the preliminary reaction mechanism 2.

[0054] The beneficial effects of adopting the above preferred scheme are: the cyclone separator is conducive to separating the ammonium chloride gas and water vapor after being dried by the fluidized drying bed, and producing condensate, and at the same time the condensate is input into the mother liquor tank in the replacement reaction mechanism for recycling, the ammonium chloride gas is input into the pre-concentrator again, and the surface cooler is conducive to condensing the ammonium chloride gas concentrated by the pre-concentrator to form ammonium chloride liquid, and transporting it back to the reaction tank in the preliminary reaction mechanism for recycling.

[0055] The specific working process of the present invention is described below:

[0056] like Figure 1 As shown, the first step is to transport the purified ash from the calcium carbide furnace to the purified ash bin 11, and evenly drop the purified ash onto the screw conveyor 12 through the star-shaped discharge valve at the bottom of the purified ash bin 11, and evenly add the purified ash into the reaction tank 21 through the screw conveyor 12, and at the same time, pass industrial water into the exhaust gas purifier 23, and pump water into the reaction tank 21 through the water pump in the exhaust gas purifier 23 to fully stir and dissolve the purified ash;

[0057] Step 2: slowly add the hydrochloric acid in the hydrochloric acid high-level tank 22 into the reaction tank 21 at a ratio of 1:3 (hydrochloric acid and purified ash) for stirring and dissolving, and the waste gas generated in the reaction tank 21 enters the waste gas purifier 23, merges with industrial water, and enters the reaction tank 21 again;

[0058] Step 3: The fully dissolved slurry (hydrochloric acid, calcium chloride, magnesium chloride and carbon powder) in the reaction tank 21 flows into the acid-base adjustment tank 31 through the high head difference, and the ammonia water in the ammonia water high tank 32 is added into the acid-base adjustment tank 31 at a ratio of 1:1 (ammonia water and slurry in the reaction tank 21) for full stirring to neutralize the solution;

[0059] Step 4: The fully stirred slurry (calcium chloride, magnesium chloride, ammonium chloride and carbon powder) in the acid-base adjustment tank 31 is pumped into the first plate-frame filter press 42 through the first slurry pump 41 for carbon powder separation, and the separated solution (calcium chloride, magnesium chloride and ammonium chloride) enters the mother liquor tank 51, and the calcium hydroxide in the calcium hydroxide high-level tank 52 is added to the mother liquor tank 51 at a ratio of 1:1 (calcium hydroxide and the solution entering the mother liquor tank 51) for full stirring and fusion;

[0060] Step 5: The pH value in the mother liquor tank 51 is adjusted to a neutral condition of 6.5-7.5, and the fully stirred and fused slurry (calcium chloride, ammonium chloride solution and magnesium hydroxide suspension) is pumped into the second plate-frame filter press 62 through the second slurry pump 61 to separate the magnesium hydroxide, and the separated solution enters the filtrate tank 71;

[0061] Step 6: The solution (calcium chloride, ammonium chloride) in the filtrate tank 71 is pumped into the pre-concentrator 73 through the third slurry pump 72;

[0062] Step 7: Discharge the concentrated liquid in the pre-concentrator 73 into the fluidized drying bed 74;

[0063] Step 8: The calcium chloride solid dried in the fluidized drying bed 74 is sent to the elevator 81 through a screw conveyor, and then enters the calcium chloride silo 82 for packaging;

[0064] Step 9: the ammonium chloride gas dried by the fluidized drying bed 74 enters the cyclone separator 91, and the separated water condensate flows back to the mother liquid tank 51;

[0065] Step 10: The ammonium chloride gas separated by the cyclone separator 91 enters the pre-concentrator 73 again for reuse, and the ammonium chloride liquid separated in the pre-concentrator 73 enters the surface cooler 92. The ammonium chloride liquid cooled by the surface cooler 92 flows back to the reaction tank 21, and the remaining uncondensed water vapor in the surface cooler 92 is discharged.

[0066] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0067] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0071] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A calcium carbide furnace purification ash treatment system, characterized in that: include: A feeding mechanism (1), a preliminary reaction mechanism (2), a neutralization mechanism (3), a carbon powder discharge mechanism (4), a substitution reaction mechanism (5), a magnesium discharge mechanism (6), a calcium discharge mechanism (7), a feeding mechanism (8) and a material circulation mechanism (9); The feeding mechanism (1) is connected to the preliminary reaction mechanism (2) to transport the purified ash to the preliminary reaction mechanism (2); the preliminary reaction mechanism (2) is connected to the neutralization mechanism (3) to neutralize the slurry after the reaction; the neutralization mechanism (3) is connected to the carbon powder discharge mechanism (4) to separate the carbon powder in the neutralized slurry; the carbon powder discharge mechanism (4) is connected to the substitution reaction mechanism (5) to perform substitution reaction on the solution after the carbon powder is separated; the substitution reaction mechanism (5) is connected to the magnesium discharge mechanism (6) to separate the substituted magnesium hydroxide; the magnesium discharge mechanism (6) is connected to the calcium discharge mechanism (7) to separate the calcium chloride in the solution; the calcium discharge mechanism (7) is connected to the unloading mechanism (8) to unload the separated calcium chloride; the material circulation mechanism (9) is connected to the calcium discharge mechanism (7), the preliminary reaction mechanism (2) and the substitution reaction mechanism (5) to recycle the ammonium chloride and water in the solution.

2. A calcium carbide furnace purification ash treatment system according to claim 1, characterized in that: The feeding mechanism (1) comprises a purified ash bin (11) and a screw conveyor (12); the purified ash bin (11) is connected to the screw conveyor (12); and the screw conveyor (12) is connected to the preliminary reaction mechanism (2).

3. A calcium carbide furnace purification ash treatment system according to claim 2, characterized in that: The preliminary reaction mechanism (2) comprises: a reaction tank (21), a hydrochloric acid high-level tank (22) and a waste gas purifier (23); the hydrochloric acid high-level tank (22) and the waste gas purifier (23) are both connected to the reaction tank (21); and the screw conveyor (12) is connected to the reaction tank (21).

4. A calcium carbide furnace purification ash treatment system according to claim 3, characterized in that: The neutralization mechanism (3) comprises an acid-base regulating tank (31) and an ammonia water high-level tank (32), the reaction tank (21) and the ammonia water high-level tank (32) are both connected to the acid-base regulating tank (31), and the acid-base regulating tank (31) is connected to the carbon powder discharge mechanism (4).

5. A calcium carbide furnace purification ash treatment system according to claim 4, characterized in that: The carbon powder discharge mechanism (4) comprises a first slurry pump (41) and a first plate-frame filter press (42); two ends of the first slurry pump (41) are connected to the acid-base adjustment tank (31) and the first plate-frame filter press (42) in a one-to-one correspondence; and two ends of the replacement reaction mechanism (5) are connected to the first plate-frame filter press (42) and the magnesium discharge mechanism (6) in a one-to-one correspondence.

6. A calcium carbide furnace purification ash treatment system according to claim 5, characterized in that: The replacement reaction mechanism (5) comprises a mother liquor tank (51) and a calcium hydroxide high-level tank (52); the first plate-frame filter press (42) and the calcium hydroxide high-level tank (52) are both connected to the mother liquor tank (51); and the mother liquor tank (51) is connected to the magnesium discharge mechanism (6).

7. A calcium carbide furnace purification ash treatment system according to claim 6, characterized in that: The magnesium discharge mechanism (6) comprises a second slurry pump (61) and a second plate-frame filter press (62), and two ends of the second slurry pump (61) are connected to the mother liquid tank (51) and the second plate-frame filter press (62) in a one-to-one correspondence.

8. The calcium carbide furnace purification ash treatment system according to claim 1, characterized in that: The calcium discharge mechanism (7) comprises: a filtrate tank (71), a third slurry pump (72), a pre-concentrator (73), a fluidized drying bed (74) and a hot air furnace (75); the second plate-frame filter press (62) in the magnesium discharge mechanism (6) is connected to the filtrate tank (71); the filtrate tank (71) is connected to the third slurry pump (72); the third slurry pump (72) is connected to the pre-concentrator (73); the pre-concentrator (73) and the hot air furnace (75) are both connected to the fluidized drying bed (74); the fluidized drying bed (74) is connected to the unloading mechanism (8) and the material circulation mechanism (9); and the pre-concentrator (73) is connected to the material circulation mechanism (9).

9. A calcium carbide furnace purification ash treatment system according to claim 8, characterized in that: The unloading mechanism (8) comprises an elevator (81) and a calcium chloride silo (82), and the bottom end and the top end of the elevator (81) are connected to the fluidized drying bed (74) and the calcium chloride silo (82) in a one-to-one correspondence.

10. A calcium carbide furnace purification ash treatment system according to claim 8, characterized in that: The material circulation mechanism (9) comprises a cyclone separator (91) and a surface cooler (92); the cyclone separator (91) is connected to the pre-concentrator (73), the fluidized drying bed (74) and the mother liquor tank (51) in the replacement reaction mechanism (5); and the surface cooler (92) is connected to the pre-concentrator (73) and the reaction tank (21) in the preliminary reaction mechanism (2).

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