CN1458063A - Process for preparing high calcium carbide product and producing calcium carbide carbide using calcium carbide waste slag - Google Patents
Process for preparing high calcium carbide product and producing calcium carbide carbide using calcium carbide waste slag Download PDFInfo
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- CN1458063A CN1458063A CN03135103A CN03135103A CN1458063A CN 1458063 A CN1458063 A CN 1458063A CN 03135103 A CN03135103 A CN 03135103A CN 03135103 A CN03135103 A CN 03135103A CN 1458063 A CN1458063 A CN 1458063A
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Abstract
Carbide slag and crushed common carbon material are mixed to obtain mixed material, and the mixture is roasted in furnace at 853-1273 deg.c for 20-50 min to obtain high calcium-carbon mixture with calcium oxide and fixed carbon as main components. The high calcium-carbon mixture is used as main material to produce calcium carbide product through reaction in electric furnace at 2121 K. The high calcium-carbon mixture is controlled to have a calcium oxide/carbon weight ratio of 61 to 39 through adding lime or coke. The present invention utilizes waste in producing calcium carbide product and has the advantages of reducing environmental pollution, etc.
Description
The technical field is as follows:
the invention relates to a method for preparing high-calcium carbon and producing calcium carbide by adopting calcium carbide waste slag, belonging to the technical field of calcium carbide production.
Background art:
the main component of the calcium carbide is CaC2Is an important chemical raw material for producing acetylene gas, and the acetylene sludge is a byproduct after hydrolysis in the use of the calcium carbide and a main component of calcium hydroxide Ca (OH)2About 95 percent of the dry slag of the calcium carbide. Produced after using calcium carbide every year in ChinaThe dry carbide slag is estimated to be over 300 million tons, wherein, the carbide slag generated by only adopting a carbide acetylene method to produce polyvinyl chloride is over 160 million tons every year, and due to the recycling technology, cost and other reasons, most of the carbide slag is not effectively utilized and is dumped except for the production of cement and other purposes. The piled carbide slag has strong alkalinity, thereby causing environmental pollution. At present, in the prior art, the production of calcium carbide mainly adopts lime and coke as raw materials for production, so that the production of the calcium carbide needs to exploit a large amount of limestone to fire the lime, thus causing damage to vegetation and water and soil loss, and seriously damaging the ecological environment by 'one-mining-one-abandonment'.
The invention content is as follows:
the purpose of the invention is: provides a method for preparing high-calcium carbon and producing calcium carbide by adopting calciumcarbide waste slag so as to achieve the aims of protecting the environment, reducing water and soil loss and utilizing wastes.
The invention is realized by the following steps: the method for preparing high-calcium carbon by adopting the waste calcium carbide slag comprises the following steps: mixing carbide slag and a crushed common carbonaceous raw material to obtain a mixture, controlling the weight percentage ratio of the dry carbide slag to the carbonaceous raw material in the mixture to be in the range of 30-70% to 70-30%, and enabling the weight percentage sum of the carbide slag and the carbonaceous raw material to be 100%, feeding the mixture into kiln equipment for roasting at the temperature of 853-1273K, and when the temperature reaches 853K, carrying out a main reaction: the calcium hydroxide is converted into calcium oxide, the heat required by roasting is mainly provided by burning volatile matters discharged from carbonaceous raw materials in the mixture and a small amount of fixed carbon, the mixture is roasted for 20-50 minutes at the temperature of 853-1273K to obtain a mixed product which has a certain particle size and mainly contains calcium oxide (CaO) and the fixed carbon (C), and the mixed product is the calcium oxideThe high-calcium carbon is prepared from calcium carbide waste slag.
The method for producing the calcium carbide by using the high calcium carbon prepared from the waste calcium carbide slag comprises the following steps: firstly, preparing high-calcium carbon by adopting calcium carbide waste slag according to the above stepsThe method comprises the steps of preparing high-calcium carbon, taking the high-calcium carbon prepared from calcium carbide waste slag as a main calcium carbide production raw material, directly and independently taking the high-calcium carbon with the weight ratio of calcium oxide to fixed carbonbeing 61: 39 prepared from the calcium carbide waste slag as the calcium carbide production raw material, namely directly feeding the high-calcium carbon into a calcium carbide electric furnace to react at a temperature of more than 2121K to generate CaC when the weight ratio of the calcium oxide to the fixed carbon in the high-calcium carbon prepared from the calcium carbide waste slag is 61: 392Thus, the calcium carbide product is produced; when lime and coke are used as raw materials for producing the calcium carbide by adopting the traditional calcium carbide production process, high-calcium carbon prepared from calcium carbide waste slag can be added into the lime and the coke and simultaneously used as the raw materials for producing, and the theoretical weight ratio of the content of calcium oxide to the content of fixed carbon in the total amount of the lime, the coke and the high-calcium carbon is 61: 39; when the weight ratio of the content of calcium oxide to the fixed carbon in the high-calcium carbon prepared from the waste calcium carbide slag is less than 61: 39, adding a corresponding amount of lime or coke according to the difference between the calcium oxide and the fixed carbon to carry out batching, so that the theoretical weight ratio of the total content of the calcium oxide and the fixed carbon of the high-calcium carbon and the blended lime or coke reaches 61: 39, then sending the batched high-calcium carbon into a calcium carbide electric furnace according to the traditional calcium carbide production process, and carrying out reaction at the temperature of above 2121K to generate CaC2Thus, the calcium carbide product is produced. Production of CaC in calcium carbide electric furnace2The reaction of (a) is: the theoretical weight ratio of calcium oxide to fixed carbon in the raw materials is about 61: 39, the reaction starting temperature is 2121K, and the reaction finishing temperature is controlled to be above 2573K.
By adopting the technical scheme, the invention directly adopts the carbide slag waste as the production raw material of high calcium carbon and utilizes the carbide slag as the raw material for producing the carbide, can partially or completely realize the closed cycle use of the calcium-containing raw material, and better solves a series of problems caused by adopting lime and coke as the production raw materials of the carbide in the prior art; in addition, the process technology for preparing the high-calcium carbon by using the carbide slag and the high-calcium carbon product have the following characteristics: a. the method can be used for roasting in various kilns, and no other heat source or fuel is needed in the roasting process; b. the product has the physicochemical indexes of granularity, strength, thermal stability, conductivity and the like which can meet the requirements of the next production; c. the content and the content of the impurity components in the high-calcium carbon are determined according to the impurity condition brought by the carbide slag and the carbonaceous raw material, and the weight ratio of the calcium oxide (CaO) to the fixed carbon (C) in the high-calcium carbon can be generally controlled to be 61-30: 39-70; d. under most conditions, the production cost of high calcium carbon is lower than the production or purchase cost of equivalent amounts of lime and coke; e. the calcium carbide product produced by the high calcium carbon meets the product quality standard produced by the lime coke method. Therefore, compared with the prior art, the method has the advantages of reducing environmental pollution, reducing water and soil loss, utilizing wastes and saving energy, and can obtain more economic benefits than the traditional calcium carbide production process due to relatively low production cost while realizing treatment and ecological environment protection.
The specific implementation mode is as follows:
the embodiment of the invention comprises the following steps: when the waste calcium carbide slag is adopted to prepare high-calcium carbon, the calcium carbide slag and the crushed common carbonaceous raw material are mixed to obtain a mixture, the weight percentage ratio of the dry calcium carbide slag to the carbonaceous raw material in the mixture is controlled within the range of 30-70 percent to 70-30 percent, the total weight percentage of the carbide slag and the carbonaceous raw material is 100 percent, the common carbonaceous raw material can adopt raw coal or other carbonaceous raw materials with ash content less than 15 percent, the mixture can be granulated or not granulated, the mixture is sent into kiln equipment to be roasted at the temperature of 853-1273K, the heat required by roasting is mainly provided by burning volatile matters discharged from carbonaceous raw materials in the mixture and a small amount of fixed carbon, after the mixture is roasted for 20-50 minutes at the temperature of 853-1273K, so as to obtain the mixed product high-calcium carbon which has a certain particle size and mainly contains calcium oxide (CaO) and fixed carbon (C).
The high-calcium carbon prepared by the method is used as a main calcium carbide production raw material, and when the weight ratio of calcium oxide to fixed carbon content in the high-calcium carbon is 61: 39 in theoretical proportion, the high-calcium carbon is directly usedHigh calcium carbon is sent into a calcium carbide electric furnace to react at the temperature of above 2121K to generate CaC2Thus, the calcium carbide product is produced; if lime and coke are used as raw materials for producing the calcium carbide in the traditional calcium carbide production process, high-calcium carbon prepared from waste calcium carbide slag can be added into the lime and the coke and simultaneously used as the raw materials for producing, and the theoretical weight ratio of the content of calcium oxide to the content of fixed carbon in the total amount of the lime, the coke and the high-calcium carbon is 61: 39; when the weight ratio of the content of the calcium oxide and the fixed carbon of the high-calcium carbon prepared from the waste calcium carbide slag is less than 61: 39, adding a corresponding amount of lime or coke according to the difference between the calcium oxide and the fixed carbon to carry out batching, so that the theoretical weight ratio of the total content of the calcium oxide and the fixed carbon of the high-calcium carbon and the blended lime or coke reaches 61: 39, then sending the batched high-calcium carbon into a calcium carbide electric furnace according to the traditional calcium carbide production process, and reacting at the temperature of above 2121K to generate CaC2Thus, the calcium carbide product is produced.
Claims (2)
1. A method for preparing high-calcium carbon by adopting calcium carbide waste slag is characterized by comprising the following steps: mixing carbide slag and a crushed common carbonaceous raw material to obtain a mixture, controlling the weight percentage ratio of the dry carbide slag to the carbonaceous raw material in the mixture to be within the range of 30-70% to 70-30%, and enabling the weight percentage sum of the carbide slag and the carbonaceous raw material to be 100%, feeding the mixture into kiln equipment to roast at the temperature of 853-1273K, wherein the heat required by roasting is mainly provided by the combustion of volatile matters discharged from the carbonaceous raw material in the mixture and a small amount of fixed carbon, and roasting the mixture at the temperature of 853-1273K for 20-50 minutes to obtain a mixed product high-calcium carbon with a certain granularity and mainly containing calcium oxide and fixed carbon.
2. A method for producing calcium carbide by using high calcium carbon prepared from calcium carbide waste slag comprises the steps of preparing the high calcium carbon by using the calcium carbide waste slag, and is characterized in that: it uses high calcium carbon prepared by calcium carbide waste slag as main calcium carbide production raw material,and the high-calcium carbon with the weight ratio of the content of calcium oxide to the content of fixed carbon being 61: 39, which is prepared from the waste calcium carbide slag, is directly and independently used as the raw material for producing the calcium carbide, namely when the weight ratio of the content of calcium oxide to the content of fixed carbon in the high-calcium carbon prepared from the waste calcium carbide slag is 61: 39, the high-calcium carbon is directly sent into a calcium carbide electric furnace to react at the temperature of over 2121K to generate CaC2Thus, the calcium carbide product is produced; when lime and coke are used as raw materials for producing the calcium carbide by adopting the traditional calcium carbide production process, high-calcium carbon prepared from calcium carbide waste slag can be added into the lime and the coke and simultaneously used as the raw materials for producing, and the theoretical weight ratio of the content of calcium oxide to the content of fixed carbon in the total amount of the lime, the coke and the high-calcium carbon is 61: 39; when the weight ratio of the content of calcium oxide to the fixed carbon in the high-calcium carbon prepared from the waste calcium carbide slag is less than 61: 39, adding a corresponding amount of lime or coke according to the difference between the calcium oxide and the fixed carbon to carry out batching, so that the theoretical weight ratio of the total content of the calcium oxide and the fixed carbon of the high-calcium carbon and the blended lime or coke reaches 61: 39, then sending the batched high-calcium carbon into a calcium carbide electric furnace according to the traditional calcium carbide production process, and carrying out reaction at the temperature of above 2121K to generate CaC2Thus, the calcium carbide product is produced.
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| CN031351034A CN1215974C (en) | 2003-05-30 | 2003-05-30 | Process for preparing high calcium carbide product and producing calcium carbide carbide using calcium carbide waste slag |
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| CN031351034A CN1215974C (en) | 2003-05-30 | 2003-05-30 | Process for preparing high calcium carbide product and producing calcium carbide carbide using calcium carbide waste slag |
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| CN1215974C CN1215974C (en) | 2005-08-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102653403A (en) * | 2012-05-17 | 2012-09-05 | 五冶集团成都节能工程技术服务有限公司 | Process method for preparing calcium carbide by recycling calcium carbide slag |
| CN104828824A (en) * | 2015-03-24 | 2015-08-12 | 中国科学院过程工程研究所 | A method of preparing calcium carbide by co-molding of carbide slag and coke powder |
| CN111285388A (en) * | 2020-03-24 | 2020-06-16 | 绵阳市安州区银源科技有限公司 | Method for preparing high-purity calcium oxide by using carbide slag |
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2003
- 2003-05-30 CN CN031351034A patent/CN1215974C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102653403A (en) * | 2012-05-17 | 2012-09-05 | 五冶集团成都节能工程技术服务有限公司 | Process method for preparing calcium carbide by recycling calcium carbide slag |
| CN104828824A (en) * | 2015-03-24 | 2015-08-12 | 中国科学院过程工程研究所 | A method of preparing calcium carbide by co-molding of carbide slag and coke powder |
| CN104828824B (en) * | 2015-03-24 | 2017-06-13 | 中国科学院过程工程研究所 | A kind of method that carbide slag prepares calcium carbide with coke powder coforming |
| CN111285388A (en) * | 2020-03-24 | 2020-06-16 | 绵阳市安州区银源科技有限公司 | Method for preparing high-purity calcium oxide by using carbide slag |
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| CN1215974C (en) | 2005-08-24 |
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