CN104692385A - Mixture for producing calcium carbide as well as preparation and application thereof - Google Patents
Mixture for producing calcium carbide as well as preparation and application thereof Download PDFInfo
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- CN104692385A CN104692385A CN201510080413.XA CN201510080413A CN104692385A CN 104692385 A CN104692385 A CN 104692385A CN 201510080413 A CN201510080413 A CN 201510080413A CN 104692385 A CN104692385 A CN 104692385A
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Abstract
The invention relates to a mixture for producing calcium carbide. The mixture is prepared by pressing, forming, thermally decomposing raw materials including carbon raw materials, quick lime and aluminum dihydrogen phosphate at a high temperature. The invention further relates to a preparation method for the mixture and an application of the mixture to preparing calcium carbide. The mixture provided by the invention is low in cost, good in strength, not pulverized after being heated at the high temperature and can be used as the raw material to produce calcium carbide.
Description
Technical field
The present invention relates to calcium carbide production field, be specifically related to a kind of compound for the production of calcium carbide.
Background technology
Calcium carbide, mainly for the production of acetylene and ethynylation chemical product, is the important source material of organic synthesis industry, and its main component is CaC
2, main electric heating process and the hot method of oxygen of adopting is produced.Current industrial production calcium carbide all adopts electric heating process, though electric heating process technique is through constantly improving, but still there is following shortcoming: 1) adopt high-quality carbon raw (coke, hard coal etc.), production cost is higher; 2) produce in adopt block carbon raw material and lime, mass transfer and heat transfer efficiency low, speed of reaction is lower; 3) adopt electric-arc heating, the conversion efficiency of thermoelectric of power generation process is only about 40%, and general power consumption is 3200 ~ 3600kwh/t calcium carbide, and energy consumption is higher, seriously hinders the development of calcium carbide industry.
The hot method of oxygen be by fuel (coal, heavy oil or Sweet natural gas etc.) burning heat is provided, substitute electric arc heat supply electrogenesis in next life stone, but so far this method without industrial applications.In order to optimize electric heating process technique further, reach and reduce costs, energy-saving and cost-reducing, shorten the object of production cycle, start to adopt low grade coal when preparing calcium carbide, and coal and lime are milled down to grade even more fine granularity, carry out mixing briquetting or pressure ball, then through or after pyrolysis, under the high temperature of about 2000 DEG C, prepare calcium carbide.In the prior art, general needs adds organic binder bond in carbon raw, can obtain the raw material preparing calcium carbide.But because organic adhesive at high temperature can volatilize or lose efficacy, after pyrolysis, efflorescence is there is or does not have intensity in compound through normal, the preparation flow of next step calcium carbide cannot be carried out, therefore, in order to realize the enforcement of new electric heating process technique, this area is needed badly and a kind ofly can be met industry for the raw material of calcium carbide need of production.
Summary of the invention
To the object of the invention is to overcome in prior art for the production of the compound of calcium carbide efflorescence or the weak defect of intensity after pyrolysis, the compound of the production calcium carbide that a kind of cost is low, intensity is high is provided.
The invention provides a kind of compound for the production of calcium carbide; Described compound by comprising the raw material of carbon raw, unslaked lime and aluminium dihydrogen phosphate, repressed shaping and high temperature pyrolysis is prepared from.
Concrete, the weight part of each raw material is: carbon raw and unslaked lime totally 100 parts, aluminium dihydrogen phosphate 5 ~ 15 parts.
Preferably, the weight part of each raw material is: carbon raw and unslaked lime totally 100 parts, aluminium dihydrogen phosphate 8 ~ 12 parts.
The weight ratio of described carbon raw and unslaked lime counts 1:1 ~ 1.8 with C:CaO, is preferably 1:1.3 ~ 1.6.
Carbon raw of the present invention can select long-flame coal or brown coal, to realize the efficiency utilization of low grade coal, reduces production cost.
Aluminium dihydrogen phosphate of the present invention is as mineral binder bond, and the meeting dehydrating polycondensation when heating also sinters, and just has high resistance folding, resistance to compression, hydration resistance, gained compound can be made to have very high intensity after 350 DEG C ~ 500 DEG C dry.Aluminium dihydrogen phosphate used in the present invention can be solid, also can be liquid.
In order to make compound obtain good intensity, each solid material that the present invention uses all can carry out grinding pre-treatment, thus subtracts short grained particle diameter; Specifically, in each solid material, the particle that particle diameter is less than 150 μm is preferably more than 85% of total amount, more preferably total amount more than 92%.Each solid material can also carry out dry pre-treatment; Specifically, the water content of each solid material is preferably less than 1%.
As a kind of preferred version, compound provided by the invention by comprising the raw material of following weight part, repressed shaping and high temperature pyrolysis is prepared from: carbon raw and unslaked lime totally 100 parts, aluminium dihydrogen phosphate 8 ~ 12 parts; Wherein, the weight ratio of carbon raw and unslaked lime counts 1:1.3 ~ 1.6 with C:CaO; Described carbon raw is that particle diameter less than 150 μm particles account for more than 85% of total amount, that water content is less than 1% long-flame coal or brown coal; In described unslaked lime, the particle of particle diameter less than 150 μm accounts for more than 85% of unslaked lime total amount.
Compound provided by the invention is optimized the consumption proportion between concrete raw material and raw material, acts synergistically between each composition, the compound be prepared from can be made to have good intensity and excellent over-all properties, be suitable for producing calcium carbide.
The present invention protects the preparation method of described compound further.Specifically, described preparation method comprises following steps:
(1) compression moulding: after being mixed by weight by each raw material, be pressed into the mold compound of thickness 12 ~ 20mm;
(2) high temperature pyrolysis: get step (1) gained mold compound, under taking high pure nitrogen as protection gas, temperature 450 ~ 750 DEG C of conditions, pyrolysis 20 ~ 60min, obtains compound.
In step of the present invention (1), by the gauge control of mold compound at 12 ~ 20mm, so that shaping and make product have some strength, and it is abundant to be easy to pyrolysis when pyrolysis; The shape of described mold compound can be block, spherical, irregularly shaped etc.;
In step of the present invention (2), described pyrolysis temperature is preferably 680 ~ 700 DEG C, and pyrolysis time is preferably 30 ~ 40min; While pyrolysis, the volatile component of effusion can be collected simultaneously.Described volatile component, for processing other products, brings extra economic benefit.
The present invention protects the application of described compound in calcium carbide is produced further.
Compound provided by the invention has good intensity, there is not the defect of efflorescence after pyrolysis, can as raw material for the production of calcium carbide.To instant invention overcomes in prior art for the production of the compound of calcium carbide efflorescence or the weak defect of intensity after pyrolysis, provide the compound of the production calcium carbide that a kind of cost is low, intensity is high.
Embodiment
Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Described in each embodiment, unslaked lime and aluminium dihydrogen phosphate are marketable material.
Embodiment 1
1, raw material composition: long-flame coal 10kg, unslaked lime 13kg, aluminium dihydrogen phosphate 2.76kg;
In described long-flame coal, fixed carbon content is 54.46%, and volatile content is 28.90%; Described long-flame coal have passed through dry and grinding pre-treatment, and moisture content is less than 1%, and the particle that particle diameter is less than 150 μm accounts for 92% of total amount;
Described unslaked lime have passed through grinding pre-treatment, and the particle that particle diameter is less than 150 μm accounts for 92% of total amount.
2, compound is prepared according to the following steps:
(1) compression moulding: after each raw material is mixed 30min in mixer, be pressed into the mold compound of thickness 15mm;
(2) high temperature pyrolysis: get step (1) gained mold compound, under taking high pure nitrogen as protection gas, temperature 680 DEG C of conditions, pyrolysis 40min, obtains compound; Volatile component is collected while pyrolysis.
Embodiment 2
1, raw material composition: long-flame coal 10kg, unslaked lime 16kg, aluminium dihydrogen phosphate 2.08kg;
Physical properties and the parameter of described long-flame coal, unslaked lime and aluminium dihydrogen phosphate are identical with embodiment 1.
2, compound is prepared according to the following steps:
(1) compression moulding: after each raw material is mixed 30min in mixer, be pressed into the mold compound of thickness 15mm;
(2) high temperature pyrolysis: get step (1) gained mold compound, under taking high pure nitrogen as protection gas, temperature 700 DEG C of conditions, pyrolysis 30min, obtains compound; Volatile component is collected while roasting.
Embodiment 3
1, raw material composition: long-flame coal 10kg, unslaked lime 10kg, aluminium dihydrogen phosphate 3kg;
Physical properties and the parameter of described long-flame coal, unslaked lime and aluminium dihydrogen phosphate are identical with embodiment 1.
2, compound is prepared according to the following steps:
(1) compression moulding: after each raw material is mixed 20min in mixer, be pressed into the mold compound of thickness 20mm;
(2) high temperature pyrolysis: get step (1) gained mold compound, under taking high pure nitrogen as protection gas, temperature 450 DEG C of conditions, pyrolysis 60min, obtains compound; Volatile component is collected while roasting.
Embodiment 4
1, raw material composition: long-flame coal 10kg, unslaked lime 18kg, aluminium dihydrogen phosphate 1.4kg;
Described long-flame coal have passed through dry and grinding pre-treatment, and moisture content is less than 1%; Each solid material is all without grinding pre-treatment, and the granule content that particle diameter is less than 150 μm is less than 85%.
2, compound is prepared according to the following steps:
(1) compression moulding: after each raw material is mixed 20min in mixer, be pressed into the mold compound of thickness 12mm;
(2) high temperature pyrolysis: get step (1) gained mold compound, under taking high pure nitrogen as protection gas, temperature 750 DEG C of conditions, pyrolysis 20min, obtains compound; Volatile component is collected while roasting.
Comparative example 1
Compared with embodiment 1, difference is only, not phosphoric acid aluminum dihydrogen in raw material.
Comparative example 2
Compared with embodiment 1, difference is only, the aluminium dihydrogen phosphate in raw material is replaced by molasses.
Experimental example: compound intensity detection
Get each embodiment, comparative example gained compound, drop to the thick steel plate of 5mm from 0.5 meter of eminence in freely falling body mode, if hold its shape, then repeat falling operation, to compound distortion or pulverizing, record falls total degree (fall for the last time and disregard), and statistics is as shown in table 1.
Table 1: compound drop number
| Number of times | |
| Embodiment 1 | 7 |
| Embodiment 2 | 6 |
| Embodiment 3 | 4 |
| Embodiment 4 | 2 |
| Comparative example 1 | 0 |
| Comparative example 2 | 1 |
As shown in Table 1, compound intensity provided by the invention is high, and not yielding or pulverizing, can be used as the production of raw material for calcium carbide.
Although above with general explanation, embodiment and test, the present invention is described in detail, and on basis of the present invention, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, all belong to the scope of protection of present invention.
Claims (10)
1., for the production of a compound for calcium carbide, it is characterized in that, described compound by comprising the raw material of carbon raw, unslaked lime and aluminium dihydrogen phosphate, repressed shaping and high temperature pyrolysis is prepared from.
2. compound according to claim 1, is characterized in that, described compound by comprising the raw material of following weight part, repressed shaping and high temperature pyrolysis is prepared from:
Carbon raw and unslaked lime totally 100 parts, aluminium dihydrogen phosphate 5 ~ 15 parts; Wherein, the weight ratio of carbon raw and unslaked lime counts 1:1 ~ 1.8 with C:CaO.
3. compound according to claim 2, is characterized in that, described compound by comprising the raw material of following weight part, repressed shaping and high temperature pyrolysis is prepared from:
Carbon raw and unslaked lime totally 100 parts, aluminium dihydrogen phosphate 8 ~ 12 parts; Wherein, the weight ratio of carbon raw and unslaked lime counts 1:1.3 ~ 1.6 with C:CaO.
4. the compound according to claims 1 to 3 any one, is characterized in that, described carbon raw is: that particle diameter less than 150 μm particles account for more than 85% of total amount, that water content is less than 1% long-flame coal or brown coal.
5. the compound according to claims 1 to 3 any one, is characterized in that, in described unslaked lime: the quicklime particles that particle diameter is less than 150 μm accounts for more than 85% of unslaked lime total amount.
6. compound according to claim 1, is characterized in that, described compound by comprising the raw material of following weight part, repressed shaping and high temperature pyrolysis is prepared from:
Carbon raw and unslaked lime totally 100 parts, aluminium dihydrogen phosphate 8 ~ 12 parts; Wherein, the weight ratio of carbon raw and unslaked lime counts 1:1.3 ~ 1.6 with C:CaO;
Described carbon raw is that particle diameter less than 150 μm particles account for more than 85% of total amount, that water content is less than 1% long-flame coal or brown coal;
In described unslaked lime, the particle of particle diameter less than 150 μm accounts for more than 85% of unslaked lime total amount.
7. prepare the method for compound described in claim 1 ~ 6 any one, it is characterized in that, described method comprises following steps:
(1) compression moulding: after being mixed by weight by raw material, is pressed into the mold compound of thickness 12 ~ 20mm;
(2) high temperature pyrolysis: get step (1) gained mold compound, under taking high pure nitrogen as protection gas, temperature 450 ~ 750 DEG C of conditions, pyrolysis 20 ~ 60min, obtains compound; While pyrolysis, collect the volatile component of effusion.
8. method according to claim 7, is characterized in that, the condition of step (2) described pyrolysis is: under temperature 680 ~ 700 DEG C of conditions, pyrolysis 30 ~ 40min.
9. the volatile component for preparing of method described in claim 7 or 8.
10. the compound that method described in compound described in claim 1 ~ 6 any one or claim 7 or 8 is prepared from is producing the application in calcium carbide.
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| CN201510080413.XA CN104692385A (en) | 2015-02-13 | 2015-02-13 | Mixture for producing calcium carbide as well as preparation and application thereof |
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| CN201510080413.XA CN104692385A (en) | 2015-02-13 | 2015-02-13 | Mixture for producing calcium carbide as well as preparation and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106006642A (en) * | 2016-06-27 | 2016-10-12 | 贵州大学 | Method for producing calcium carbide by powdery calcium oxide |
Citations (4)
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|---|---|---|---|---|
| JPS5891024A (en) * | 1981-11-11 | 1983-05-30 | ベブ・ガスコンビナ−ト・シユバルツ・プンペ | Manufacture of fully burden moldings for calcium carbide |
| CN102225765A (en) * | 2011-05-10 | 2011-10-26 | 云南邦特新材料有限公司 | Mixed pellets composed of fine coal powder and limestone powder for producing calcium carbide |
| CN103272536A (en) * | 2012-06-21 | 2013-09-04 | 北京化工大学 | Composite bed reactor and method for combined production of calcium carbide, gas and tar |
| CN103708456A (en) * | 2013-12-25 | 2014-04-09 | 北京神雾环境能源科技集团股份有限公司 | Method for preparing calcium carbide |
-
2015
- 2015-02-13 CN CN201510080413.XA patent/CN104692385A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5891024A (en) * | 1981-11-11 | 1983-05-30 | ベブ・ガスコンビナ−ト・シユバルツ・プンペ | Manufacture of fully burden moldings for calcium carbide |
| CN102225765A (en) * | 2011-05-10 | 2011-10-26 | 云南邦特新材料有限公司 | Mixed pellets composed of fine coal powder and limestone powder for producing calcium carbide |
| CN103272536A (en) * | 2012-06-21 | 2013-09-04 | 北京化工大学 | Composite bed reactor and method for combined production of calcium carbide, gas and tar |
| CN103708456A (en) * | 2013-12-25 | 2014-04-09 | 北京神雾环境能源科技集团股份有限公司 | Method for preparing calcium carbide |
Non-Patent Citations (3)
| Title |
|---|
| 徐平坤: "《刚玉耐火材料（第2版）》", 30 June 2007 * |
| 李远才等: "《铸造造型材料实用手册》", 31 March 2009 * |
| 金祖权等: "新型电石成型原料研究", 《北京科技大学学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106006642A (en) * | 2016-06-27 | 2016-10-12 | 贵州大学 | Method for producing calcium carbide by powdery calcium oxide |
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Address after: 102200 Beijing city Changping District Machi Town cow Road No. 18 Applicant after: Shenwu science and technology group Limited by Share Ltd Address before: 102200 Beijing city Changping District Machi Town cow Road No. 18 Applicant before: Beijing Shenwu Environment Energy Technology Group Co., Ltd. |
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Application publication date: 20150610 |