CN108423683B - Method for producing calcium carbide raw material lime balls by using dry acetylene carbide slag - Google Patents
Method for producing calcium carbide raw material lime balls by using dry acetylene carbide slag Download PDFInfo
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- CN108423683B CN108423683B CN201810275702.9A CN201810275702A CN108423683B CN 108423683 B CN108423683 B CN 108423683B CN 201810275702 A CN201810275702 A CN 201810275702A CN 108423683 B CN108423683 B CN 108423683B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/90—Carbides
- C01B32/914—Carbides of single elements
- C01B32/942—Calcium carbide
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
Abstract
The invention relates to the technical field of calcium carbide production by using carbide slag, in particular to a method for producing calcium carbide raw material lime balls by using dry acetylene carbide slag, which comprises the following steps: screening and separating the dry acetylene sludge to obtain primary dry acetylene sludge; purifying, dehydrating and drying the primary dry carbide slag to obtain secondary dry carbide slag; calcining the secondary dry carbide slag at high temperature to obtain a lime product; and pressing the lime product into balls by a ball press machine to obtain the calcium carbide raw material lime balls produced by the dry acetylene carbide slag. The method has the advantages that the process is simple, the method is economical and practical, the dry acetylene carbide slag is dried and dehydrated and is further sintered and dehydrated to prepare the lime balls serving as raw materials for producing the calcium carbide, the obtained lime balls are stable in product quality, the dry acetylene is prevented from discharging the carbide slag, novel industrialization, zero emission and cyclic utilization of the carbide slag are realized, the maximum utilization of waste resources is realized, the production cost is saved, and the economic benefit is improved.
Description
Technical Field
The invention relates to the technical field of calcium carbide production by using acetylene sludge, in particular to a method for producing calcium carbide raw material lime balls by using dry acetylene sludge.
Background
The carbide slag is waste slag discharged by chemical enterprises and comprises the chemical components of Ca (OH)2About 80% of particles are between 10 and 15 microns, and according to the difference of production processes, the carbide slag is divided into wet-discharge carbide slag and dry-discharge carbide slag, wherein the wet-discharge carbide slag is waste slag discharged by a wet acetylene generation process, the water content of the wet-discharge carbide slag is generally between 30 and 35 percent after filter pressing, the dry-discharge carbide slag is waste slag discharged by a dry acetylene generation process, and the water content of the dry-discharge carbide slag is generally between 27 and 7 percent.
The main chemical component of the carbide slag is calcium hydroxide, the calcium hydroxide accounts for about 83 percent, and the carbide slag contains FeSi and Fe in different proportions according to different masses of upstream limestone and calcium carbide2O3、SiO2、Fe3O4、Al2O3MgO, etc. except Ca (OH) in the process of producing lime by carbide slag for recycling2In addition, other chemical components adversely affect lime reproduction and should be removed.
In China, the discharge amount of the carbide slag per year currently exceeds 2000 million tons (dry basis), the stock over the years exceeds 1 million tons, the discharge amount of the carbide slag per year in the autonomous region of Xinjiang only also reaches more than 800 million tons (dry basis), the carbide slag is widely and maturely applied and used as a cement production raw material, a large amount of the carbide slag is consumed in the industry, the rear troubles of upstream chemical enterprises are relieved, but because the modernization basic construction of China is basically completed, the real estate and bridge construction are basically saturated, the capacity of the cement industry is seriously surplus recently, because cement products are difficult to decompose and generate a large amount of solid wastes which can not reverse the environment, and because the cement produced by the carbide slag still contains components harmful to the human body, the cement is restricted in civil buildings and intensive public facility buildings to certain extent, and the factors of the soft and weak property and the fatigue of the cement market are caused to be summarized, The cost is low, the overall benefit of the industry is poor, the start-up is insufficient, the consumption of the carbide slag is seriously influenced, and the development of upstream and downstream industrial chains is greatly restricted.
Because the main chemical component of the carbide slag is Ca (OH)2If the calcium carbide slag can be calcined to become a lime product to be applied to calcium carbide production, 2100 ten thousand tons of limestone can be saved every year even if the recovery rate is only 80 percent, 21 sets of enterprises producing 100 ten thousand tons of limestone every year can be reduced, 21 Qingshan mountains can be opened less, social benefit, environmental protection benefit and economic benefit brought by the enterprises are objective, the maximum utilization of resources is really achieved, the requirements of national circular economy and industrial sustainable development are met, and the method has important significance for realizing novel industrialization and zero emission。
At present, the process for preparing acetylene by calcium carbide mainly adopts wet-process calcium carbide preparation of acetylene, the recycling research of the calcium carbide slag also mainly adopts the wet-process calcium carbide slag, and the research on the recycling of the calcium carbide slag by taking the dry-process calcium carbide slag as a raw material is rarely reported.
Disclosure of Invention
The invention provides a method for producing calcium carbide raw material lime balls by using dry acetylene carbide slag, which overcomes the defects of the prior art, avoids the discharge of the carbide slag by using the dry acetylene, realizes novel industrialization, zero discharge and cyclic utilization of the carbide slag, realizes the maximum utilization of waste resources, saves the production cost and improves the economic benefit.
The technical scheme of the invention is realized by the following measures: a method for producing calcium carbide raw material lime balls by using dry acetylene carbide slag comprises the following steps: the method comprises the steps of firstly, screening and winnowing separation are carried out on the dry acetylene sludge, and large unreacted particle impurities with the particle size of more than 1mm in the dry acetylene sludge are removed to obtain primary dry acetylene sludge; secondly, purifying, dehydrating and drying the primary dry carbide slag in a pre-drying device, and reducing the moisture content of the primary dry carbide slag to 1-2% to obtain secondary dry carbide slag; thirdly, diluting the waste tar solution by using the organic waste liquid with the moisture removed, uniformly spraying the diluted waste tar solution on the secondary dry carbide slag, and calcining the secondary dry carbide slag at high temperature of 450-680 ℃ by using water gas which is a byproduct in the production process of the calcium carbide as a fuel to obtain a lime product; and fourthly, pressing the obtained lime product into balls for forming to obtain the calcium carbide raw material lime balls.
The following is further optimization or/and improvement of the technical scheme of the invention:
during the winnowing separation, an impurity remover is required to be introduced, wherein the impurity remover is HF gas, and the concentration of the HF gas is 1-3%.
In the third step, when the MgO content in the lime product is more than 0.6 percent, the MgO is removed by adopting a high-temperature calcination mode at 1400 ℃ to 2100 ℃.
The wind speed of the winnowing separation is 1m/s to 5 m/s.
The screening of the dry acetylene sludge adopts a mechanical vibrating screen with 1mm screen holes.
The temperature of the pre-drying equipment is 100 ℃ to 120 ℃.
The organic waste liquid from which the moisture is removed is methanol, THF, and the organic waste liquid from which the moisture is removed from methyl acetate is a mixture of methanol, THF and methyl acetate.
The lime product is pressed into balls and formed, and the spherical particle size is 4 cm-8 cm.
The method has the advantages that the process is simple, the method is economical and practical, the dry acetylene carbide slag is prepared into the lime balls which are used as raw materials for producing the calcium carbide, the obtained lime balls are stable in product quality, the dry acetylene is prevented from discharging the carbide slag, novel industrialization, zero discharge and cyclic utilization of the carbide slag are realized, the maximum utilization of waste resources is realized, the production cost is saved, and the economic benefit is improved.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention. The various chemical reagents and chemical articles mentioned in the invention are all the chemical reagents and chemical articles which are well known and commonly used in the prior art, unless otherwise specified; the percentages in the invention are mass percentages unless otherwise specified; the solution in the present invention is an aqueous solution in which the solvent is water, for example, a hydrochloric acid solution is an aqueous hydrochloric acid solution, unless otherwise specified; the normal temperature and room temperature in the present invention generally mean a temperature of 15 ℃ to 25 ℃, and are generally defined as 25 ℃.
The invention is further described below with reference to the following examples:
example 1: the method for producing the calcium carbide raw material lime balls by using the dry acetylene carbide slag comprises the following steps: the method comprises the steps of firstly, screening and winnowing separation are carried out on the dry acetylene sludge, and large unreacted particle impurities with the particle size of more than 1mm in the dry acetylene sludge are removed to obtain primary dry acetylene sludge; secondly, purifying, dehydrating and drying the primary dry carbide slag in a pre-drying device, and reducing the moisture content of the primary dry carbide slag to 1-2% to obtain secondary dry carbide slag; thirdly, diluting the waste tar solution by using the organic waste liquid with the moisture removed, uniformly spraying the diluted waste tar solution on the secondary dry carbide slag, and calcining the secondary dry carbide slag at high temperature of 450-680 ℃ by using water gas which is a byproduct in the production process of the calcium carbide as a fuel to obtain a lime product; and fourthly, pressing the obtained lime product into balls for forming to obtain the calcium carbide raw material lime balls.
In the invention, the secondary dry carbide slag can be directly used as an industrial desulfurizer; the calcium carbide raw material lime balls can also be directly used as an industrial desulfurizer
In the invention, the secondary dry carbide slag is calcined at high temperature, so that the moisture in the secondary dry carbide slag is thoroughly removed, the organic waste liquid is used as a diluent and a supplementary fuel of waste tar, the waste tar solution uniformly sprays the secondary dry carbide slag and is mainly used as a binder, and the secondary dry carbide slag can be bonded into blocks even after being calcined into powder at high temperature, thereby being convenient for granulating by a ball press.
Example 2: the method for producing the calcium carbide raw material lime balls by using the dry acetylene carbide slag comprises the following steps: the method comprises the steps of firstly, screening and winnowing separation are carried out on the dry acetylene sludge, and large unreacted particle impurities with the particle size of more than 1mm in the dry acetylene sludge are removed to obtain primary dry acetylene sludge; secondly, purifying, dehydrating and drying the primary dry carbide slag in a pre-drying device, and reducing the moisture content of the primary dry carbide slag to 1% or 2% to obtain secondary dry carbide slag; thirdly, diluting the waste tar solution by using the organic waste liquid with the moisture removed, uniformly spraying the diluted waste tar solution on the secondary dry carbide slag, and calcining the secondary dry carbide slag at high temperature of 450 ℃ or 680 ℃ by using water gas which is a byproduct in the production process of the calcium carbide as a fuel to obtain a lime product; and fourthly, pressing the obtained lime product into balls for forming to obtain the calcium carbide raw material lime balls.
Example 3: as optimization of the embodiment, an impurity remover is required to be introduced during air separation, wherein the impurity remover is HF gas, and the concentration of the HF gas is 1-3%.
Example 4: as the optimization of the above embodiment, in the third step, when the MgO content in the lime product is above 0.6%, MgO is removed by high temperature calcination at 1400 ℃ to 2100 ℃.
In the invention, MgO can volatilize under the high temperature condition of 1350 ℃ to 2300 ℃ and the content can be reduced, thereby ensuring that the MgO content in the lime product is in a controllable range of 0.2 percent to 0.6 percent, and further achieving the purpose of purifying and removing impurities from the lime product.
Example 5: as optimization of the above embodiment, the wind speed of the winnowing separation is 1m/s to 5 m/s.
Example 6: as the optimization of the embodiment, the mechanical vibrating screen with the screen hole of 1mm is adopted for screening the acetylene sludge by the dry method.
Light specific gravity Ca (OH) of micro-fan handle2、Mg(OH)2And SiO2Blowing into steam preheater, introducing HF gas and SiO in carbide slag particles via flow meter in fresh air2Fully contact-reacting to generate SiF4Gas SiO removal with gas flow2The reaction is exothermic, and the progress of the reaction can be further promoted by cooling with fresh air, and SiO can be effectively removed by this method2Ensure SiO in the lime product2The content is in a controllable range.
Example 7: as an optimization of the above embodiment, the temperature of the pre-drying apparatus is 100 ℃ to 120 ℃.
Example 8: in the optimization of the above embodiment, the organic waste liquid from which moisture is removed is a mixture of methanol, THF and methyl acetate.
Example 9: as optimization of the above embodiment, the lime product is pressed into balls with a ball size of 4cm to 8 cm.
Each detection index of the limestone balls as the calcium carbide raw materials obtained by the above embodiment is shown in Table 1. As can be seen from Table 1, the dry acetylene sludge used in the production of the limestone balls as the calcium carbide raw material has various indexes within the range of the national standard requirements, and the national standard requirements are shown in Table 2.
In conclusion, the process is simple, economic and practical, the lime balls are prepared from the acetylene carbide slag by the dry method and are used as raw materials for calcium carbide production, the obtained lime balls are stable in product quality and can be used as an industrial desulfurizer, the acetylene carbide slag discharged by the dry method is avoided, novel industrialization, zero emission and cyclic utilization of the acetylene carbide slag are realized, the maximum utilization of waste resources is realized, the production cost is saved, and the economic benefit is improved.
The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
TABLE 1
TABLE 2
Claims (10)
1. A method for producing calcium carbide raw material lime balls by using dry acetylene carbide slag is characterized by comprising the following steps: the method comprises the steps of firstly, screening and winnowing separation are carried out on the dry acetylene sludge, and large unreacted particle impurities with the particle size of more than 1mm in the dry acetylene sludge are removed to obtain primary dry acetylene sludge, wherein an impurity removing agent is required to be introduced during winnowing separation, the impurity removing agent is HF gas, and the concentration of the HF gas is 1-3%; secondly, purifying, dehydrating and drying the primary dry carbide slag in a pre-drying device, and reducing the moisture content of the primary dry carbide slag to 1-2% to obtain secondary dry carbide slag; thirdly, diluting the waste tar solution by using the organic waste liquid with the moisture removed, uniformly spraying the diluted waste tar solution on the secondary dry carbide slag, and calcining the secondary dry carbide slag at high temperature of 450-680 ℃ by using water gas which is a byproduct in the production process of the calcium carbide as a fuel to obtain a lime product; and fourthly, pressing the obtained lime product into balls for forming to obtain the calcium carbide raw material lime balls.
2. The method for producing calcium carbide raw material lime balls by using dry acetylene carbide slag according to claim 1, wherein in the third step, when the content of MgO in the lime product is more than 0.6%, MgO is removed by high-temperature calcination at 1400 ℃ to 2100 ℃.
3. The method for producing calcium carbide raw material limestone balls by using the dry-process acetylene carbide slag according to claim 1 or 2, wherein the air speed of the air separation is 1 to 5 m/s.
4. The method for producing calcium carbide raw material limestone balls by using the dry acetylene sludge as claimed in claim 1 or 2, wherein the dry acetylene sludge screening adopts a mechanical vibrating screen with 1mm screen hole.
5. The method for producing calcium carbide raw material limestone balls by using the dry acetylene carbide slag according to claim 3, wherein the screening of the dry acetylene carbide slag adopts a mechanical vibrating screen with 1mm screen holes.
6. The method for producing calcium carbide raw material limestone balls by using the dry acetylene carbide slag according to claim 1, 2 or 5, wherein the temperature in the drying equipment is 100 ℃ to 120 ℃.
7. The method for producing calcium carbide raw material lime balls by using dry acetylene carbide slag according to claim 3, wherein the temperature in the drying equipment is 100 ℃ to 120 ℃.
8. The method for producing calcium carbide raw material lime balls by using dry acetylene carbide slag according to claim 4, wherein the organic waste liquid from which water is removed is a mixture of methanol, THF and methyl acetate.
9. The method for producing calcium carbide raw material lime balls by using dry acetylene carbide slag according to claim 6, wherein the organic waste liquid from which water is removed is a mixture of methanol, THF and methyl acetate.
10. The method for producing calcium carbide raw material lime balls by using the dry-process acetylene carbide slag according to claim 1, 2, 5, 7 or 8, wherein the lime product is pressed into balls and formed, and the ball-shaped particle size is 4cm to 8 cm.
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| CN114958426B (en) * | 2022-04-26 | 2023-06-27 | 上海应用技术大学 | Method for accurately controlling acetylene content in solvent |
| 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 |
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| US4213955A (en) * | 1977-11-23 | 1980-07-22 | Union Carbide Corporation | Computerized process and apparatus for use with a submerged arc electric furnace to produce metallurgical products |
| CN1035097A (en) * | 1988-02-08 | 1989-08-30 | 重庆建筑工程学院 | Use production of calcium oxide of high activity from calcium carbide residue |
| CN101168117A (en) * | 2007-08-30 | 2008-04-30 | 宁夏英力特电力集团股份有限公司 | Method for preparing high-performance solid desulfurizing agent by carbide slag slurry |
| CN101898083A (en) * | 2010-07-30 | 2010-12-01 | 福建龙净脱硫脱硝工程有限公司 | Method and device for preparing dry desulfurizing agent by using carbide slag |
| CN105948091A (en) * | 2016-05-12 | 2016-09-21 | 新疆中泰创安环境科技股份有限公司 | Active calcium oxide with calcium carbide dreg as raw material, desulfurizing agent, calcium carbide raw material and preparation method of active calcium oxide |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5498494B2 (en) * | 2008-08-01 | 2014-05-21 | 北京化工大学 | Carbide manufacturing method and system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4213955A (en) * | 1977-11-23 | 1980-07-22 | Union Carbide Corporation | Computerized process and apparatus for use with a submerged arc electric furnace to produce metallurgical products |
| CN1035097A (en) * | 1988-02-08 | 1989-08-30 | 重庆建筑工程学院 | Use production of calcium oxide of high activity from calcium carbide residue |
| CN101168117A (en) * | 2007-08-30 | 2008-04-30 | 宁夏英力特电力集团股份有限公司 | Method for preparing high-performance solid desulfurizing agent by carbide slag slurry |
| CN101898083A (en) * | 2010-07-30 | 2010-12-01 | 福建龙净脱硫脱硝工程有限公司 | Method and device for preparing dry desulfurizing agent by using carbide slag |
| CN105948091A (en) * | 2016-05-12 | 2016-09-21 | 新疆中泰创安环境科技股份有限公司 | Active calcium oxide with calcium carbide dreg as raw material, desulfurizing agent, calcium carbide raw material and preparation method of active calcium oxide |
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