Process method for producing calcium carbide
By grinding limestone blocks into powder and calcining them in a preheater and an external decomposition furnace to form high-temperature lime powder, which is then mixed with semi-coke powder blocks to produce high-temperature pellets, the problems of low energy utilization and high cost in the traditional electrothermal method are solved, achieving efficient and environmentally friendly calcium carbide production.
Patent Information
- Application Number
- CN202511682137.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-17
- Publication Date
- 2026-01-20
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Traditional electrothermal methods for producing calcium carbide suffer from low energy utilization, high power consumption, low productivity, high costs, and energy loss and environmental pollution due to uneven heat distribution.
After the limestone blocks are ground into powder, they are calcined in a preheater and an external decomposition furnace to form high-temperature lime powder. This powder is then uniformly mixed with semi-coke powder blocks to form high-temperature pellets. These pellets are then fed into an electric furnace through a briquetting machine and heated to over 1700°C to form high-quality calcium carbide. This process optimizes the design of the combustion unit and the calcination process.
It improved the utilization rate of electrical and thermal energy, reduced production costs, increased the output and quality of calcium carbide, reduced dust pollution, and achieved an environmentally friendly and energy-saving production process.
Smart Images
Figure CN121361798A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a method for producing calcium carbide by means of a mill, a preheater, an out-kiln decomposing furnace, high-temperature lime powder and lanthanum-carbon block pressing into high-temperature spherical block conveying electric furnace and other technical means, in particular to a process method for producing calcium carbide. BACKGROUND
[0002] The traditional electric heating method for producing calcium carbide is to use the heat energy generated by the electric arc to make the carbon raw material and lime react at a temperature above 1700 DEG C to produce calcium carbide. The main structure of the electric furnace includes the furnace body and the electrode. When the electric furnace is working, the electric arc is generated by electricity, and the high temperature generated by the electric arc is used to heat the furnace charge, so that the furnace charge can reach the heat required for chemical reaction. Among them, the area directly affected by the high temperature of the electric arc is called the electric arc working area or the molten pool, which is located below the electrode tip to the furnace bottom. The traditional calcium carbide furnace is circular, and the three-phase electrode structure is arranged inside the furnace body. The outer furnace body is circular. Because the distribution of heat energy is too different, some furnace charges cannot or are difficult to react, the effective utilization rate of electric energy is low, and the energy loss is serious, resulting in low production rate of the electric furnace, high power consumption, large consumption of coal and high cost. SUMMARY
[0003] The technical problem to be solved by the present application is to provide a process method for producing calcium carbide, and the above method solves the problems of high power consumption, low yield of calcium carbide furnace and high cost in the production of calcium carbide.
[0004] To solve the above-mentioned problems, the technical scheme of the present application is as follows: a process method for producing calcium carbide, comprising the following steps:
[0005] (1) The raw material limestone is ground into <5mm limestone powder in a mill and stored in a warehouse.
[0006] (2) The limestone powder obtained in step (1) is measured, then the limestone powder is input into a preheater and a decomposing furnace with a height of ≥10m through an elevator, and the preheater and the decomposing furnace have two or more combustion units to calcine the limestone powder to obtain high-quality high-temperature lime powder.
[0007] (3) Coal, gas, oil and electricity are used to provide heat energy to the preheater and the out-kiln decomposing furnace, and the limestone powder in the preheater and the decomposing furnace is calcined and decomposed to obtain high-quality high-temperature lime powder.
[0008] (4) An unqualified lime powder and qualified lime powder separation device is arranged in the decomposing furnace to ensure the quality of the lime.
[0009] (5) The high-quality high-temperature lime powder obtained in step (2) is measured by a metering device, then the measured high-quality high-temperature lime powder and the measured lanthanum-carbon block are conveyed to a mixing and stirring machine, stirred uniformly to obtain high-temperature material, then the high-temperature material is input into a ball press to obtain high-temperature spherical blocks, and the high-temperature spherical blocks are continuously conveyed into an electric furnace to be heated to a temperature above 1700 DEG C to obtain high-quality calcium carbide.
[0010] Preferably, the preheater decomposition furnace constitutes a combustion unit, and two or more combustion units are provided.
[0011] Preferably, the preheater feed inlet, the decomposition furnace feed inlet, the stirring device feed inlet, the briquetting machine feed inlet, and the electric furnace feed inlet are provided with one or more than one lime powder and lanthanum carbon block metering and batching device.
[0012] Preferably, the briquetting machine discharge outlet is connected to the electric furnace feed inlet, and one electric furnace or more than one electric furnace is provided.
[0013] Compared with the prior art, the lime block and the lanthanum carbon block are input into the electric furnace at room temperature to produce calcium carbide. The positive effects of the present application are as follows: firstly, the raw material limestone block is powdered, and high-quality lime powder at high temperature is obtained from the preheater and the out-kiln decomposition furnace in the subsequent primary calcination and curing calcination stage, which is input into the metering device, mixed with the metered lanthanum carbon block powder, and then uniformly stirred in the mixing and stirring machine, and then continuously input into the briquetting machine to obtain high-temperature briquettes, which are continuously input into the electric furnace, thereby forming a continuous calcination process. The completely cured calcium carbide structure produced by the continuous calcination process is incomparable to the traditional equipment and production process. The present application has small dust, high utilization rate of heat and electric energy, and high yield. BRIEF DESCRIPTION OF DRAWINGS
[0014] Fig. 1 is a flowchart of the process for producing calcium carbide according to the present application. DETAILED DESCRIPTION
[0015] For the quality of calcium carbide, the combustion system between the preheater and the out-kiln decomposing furnace is redesigned, the preheater is designed as a two-stage preheater or more than two-stage preheater, specifically, in order to improve the calcination quality of the powdered limestone, compared with the prior art, the calcination space of the preheater is designed as independent, respectively shaped and connected with each other through pipelines, the number of the combustion chambers in the combustion unit formed by the preheater and the out-kiln decomposing furnace can be set to two or more, and the calcination of the limestone powder is performed, so that the high-quality high-temperature lime powder is obtained, the lime powder is mixed and stirred with the metered carbon block through a mixing stirrer to obtain high-temperature material, the high-temperature ball block with a diameter of greater than or equal to 0.5 cm is formed by a ball press machine and continuously conveyed to an electric furnace for continuous heating to above 1700 DEG C, and the high-quality calcium carbide is obtained. It is proved by the above examples that the process method for producing calcium carbide according to the present application can greatly improve the process level of traditional calcium carbide production, and the traditional calcium carbide production process uses lime blocks and carbon blocks, and the calcium carbide is obtained by heating from room temperature to above 1700 DEG C in an electric furnace. In the present application, the limestone powder is heated to above 900 DEG C in the preheater and the decomposing furnace, and the high-temperature material is obtained by continuously conveying the metered high-temperature lime powder to the mixing stirrer and mixing and stirring the high-temperature lime powder with the metered carbon block, and then the high-temperature material is continuously sent to the ball press machine to obtain high-temperature ball material, and the high-temperature ball material is continuously sent to the electric furnace to produce high-quality calcium carbide. The cost of producing calcium carbide can be reduced by more than 35%.
[0016] So far, referring to Figure 1 The production process of calcium carbide according to the present application is compared with the traditional production process of calcium carbide in terms of calcium carbide quality, energy saving, environmental protection and the like.
[0017] Comparison of calcium carbide quality:
[0018] 1. The main way to produce lime blocks at present is to use a vertical kiln, a rotary kiln, a Swiss Maerz kiln, a French double-beam kiln and the like. This kind of lime block production process is to ventilate and heat the lime blocks between the lime blocks, to calcine and decompose the lime blocks, and to calcine and decompose the lime blocks from the outside to the inside layer by layer, which is easy to cause the outside of the lime block to be burned and the inside of the lime block to be not completely decomposed, and the lime calcination and decomposition rate is less than 95%.
[0019] 2. The process characteristics of the present application are that the lime blocks are processed into lime powder, the lime powder is suspended in the preheater decomposing furnace by air force to heat and calcine and decompose the lime powder, the heating is uniform, the lime decomposition speed is fast, and the decomposition rate is more than 98%.
[0020] 3. At present, the machine kiln uses limestone block to calcine into lime block, and the calcination time is more than 10 hours, and the activity of the calcined lime block is about 300. Because the activity of the lime block is low, the reaction with the carbon block is slow, and high-quality calcium carbide cannot be produced.
[0021] 4. At present, the rotary kiln, Swiss Maerz kiln and French double beam kiln are used to calcine limestone block into lime block, and the calcination time is more than 4 hours, and the activity of the calcined lime block is about 400. At present, the lime block and the carbon block are used to produce calcium carbide in China.
[0022] 5. The feature of the present application is that the limestone block is ground into limestone powder, and the limestone powder is suspended in the preheater decomposition furnace and calcined and decomposed into lime powder. The calcination time of the calcined lime powder is less than 1 minute. The activity of the calcined lime powder is about 500, so the high-quality lime powder produced by the process has high activity and fast reaction speed with the carbon powder block, and high-quality calcium carbide can be produced.
[0023] Energy saving comparison:
[0024] 6. The process for producing calcium carbide using the rotary kiln, Swiss Maerz kiln and French double beam kiln is to screen out the lime block from the calcined lime block, and then heat the lime block and the carbon block from room temperature to above 1700 DEG C in an electric furnace to produce calcium carbide.
[0025] 7. The process for producing calcium carbide of the present application is to grind the limestone block into limestone powder, directly convey the limestone powder into the preheater decomposition furnace for calcination and decomposition, obtain high-quality high-temperature lime powder, continuously convey the high-temperature lime powder into a metering device, after metering, convey the metered carbon powder block into a mixing and stirring machine for stirring, the mixing and stirring machine is provided with a pushing device, a reverse pushing device and a lifting device, so that the high-temperature lime powder and the carbon powder block are uniformly stirred, continuously conveyed to a ball press machine to obtain high-temperature ball block, and continuously conveyed to an electric furnace for heating to above 1700 DEG C to produce high-quality calcium carbide. Compared with the traditional process for producing calcium carbide, the electricity saving is more than 25%, and the comprehensive cost of producing calcium carbide is reduced by more than 35%.
[0026] Environmental protection comparison
[0027] 8. The traditional process for producing calcium carbide uses lime block and carbon block to be conveyed from room temperature to an electric furnace for heating to above 1700 DEG C to produce calcium carbide. First, the lime powder block is screened, and the lime powder and the lime block have large operation amount, so that bag dust removal and water mist dust removal cannot be used due to large site area, and the working environment is polluted.
[0028] 9. The process for producing calcium carbide, limestone powder is used, through the preheater decomposition furnace calcination decomposition, to obtain high-quality high-temperature lime powder. The high-temperature lime powder is continuously conveyed to the metering device, and the metered lanthanum carbon block is continuously conveyed to the mixer, the stirred high-temperature material is continuously conveyed to the ball press, the high-temperature ball block is obtained, and the high-quality calcium carbide is produced by heating to 1700 DEG C or more in the electric furnace. The process for producing calcium carbide does not appear multiple dust, improves the work efficiency, and is environmental protection and energy saving.
Claims
1. A process for producing calcium carbide, comprising the steps of: (1) grinding the raw material limestone into limestone powder of <5 mm in size and storing it in a silo; (2) metering the limestone powder obtained in step (1) and feeding it into a preheater-decomposition furnace having two or more combustion units and a height of ≥10 m, and calcining and decomposing the limestone powder into high-quality high-temperature lime powder; (3) providing heat energy to the preheater-decomposition furnace by burning coal, gas, oil, or electricity, and calcining and decomposing the limestone powder in the preheater-decomposition furnace into high-quality high-temperature lime powder; (4) providing an unqualified lime powder and qualified lime powder separation device inside the decomposition furnace to ensure the quality of the lime; (5) metering the high-quality high-temperature lime powder obtained in step (2) and mixing it with metered lanthanum-carbon powder blocks in a mixing and stirring machine to obtain a mixture of lime powder and lanthanum-carbon powder blocks, feeding the mixture into a ball press to obtain high-temperature blocks of ≥0.5 cm in size, and continuously feeding the high-temperature blocks into an electric furnace to heat them to a temperature of ≥1700℃ to obtain high-quality calcium carbide.
2. The process for producing calcium carbide according to claim 1, characterized in that The bottom preheater discharge outlet is provided with a metering device, and the high-quality high-temperature lime powder obtained is mixed with metered lanthanum-carbon powder blocks in a mixing and stirring machine, and the mixture is continuously fed into a ball press to obtain high-temperature blocks, which are continuously fed into an electric furnace to heat them to a temperature of ≥1700℃ to obtain calcium carbide.
3. The process for producing calcium carbide according to claim 1, characterized in that The decomposition furnace is provided with an unqualified lime powder and qualified lime powder separation device inside to ensure the quality of the lime.
4. The process for producing calcium carbide according to claim 1, characterized in that The preheater-decomposition furnace is provided with two or more combustion units.
5. The process for producing calcium carbide according to claim 1, characterized in that The ball press, discharge outlet, and electric furnace inlet are provided with one electric furnace or two or more electric furnaces.