CN1017134B - Prodction process of calcium carbide by use of brow coal - Google Patents
Prodction process of calcium carbide by use of brow coalInfo
- Publication number
- CN1017134B CN1017134B CN90102356A CN90102356A CN1017134B CN 1017134 B CN1017134 B CN 1017134B CN 90102356 A CN90102356 A CN 90102356A CN 90102356 A CN90102356 A CN 90102356A CN 1017134 B CN1017134 B CN 1017134B
- Authority
- CN
- China
- Prior art keywords
- calcium carbide
- brown coal
- coal
- technology
- optimum value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Classifications
-
- 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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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The present invention provides a technology which directly adopting brown coal as carbon raw materials to producing calcium carbide. Mine run brow coal and quick lime are put in a universal electric furnace in a certain proportion so as to produce the calcium carbide. The technology has the advantages of electricity saving and production increase and reduces the production cost by 20 to 30%.
Description
The present invention relates to usefulness brown coal raw coal and unslaked lime are produced calcium carbide in electric furnace technology, belong to the technical field of producing calcium carbide.
Electric furnace smelting process is generally adopted in the calcium carbide production of China, promptly makes carbon materials with metallurgical coke, and the calcium raw material is selected unslaked lime for use, and two kinds of raw materials drop into electric furnace by known proportioning and produce calcium carbide.But coke is the coal converted products, price height not only, and also often supply falls short of demand, because it also is the fuel of industries urgent needs such as metallurgical and chemical industry.
According to the retrieval, German Democratic Republic has the patent (PAT.NO.DD248026 and DD231945) of utilizing brown coal coke production calcium carbide, and there is the patent (PAT.NO.DE2925897) of utilizing hot brown coal coke and unslaked lime to produce calcium carbide in the hot stove of oxygen the Germany.The used carbon materials of these three patents all is the brown coal coke, and this coke needs special refining, smelts the hot stove of oxygen of calcium carbide and must make thermal source with oxygen.Another patent (PAT.NO.DE3124672) of Germany is to make the raw material of carbon materials with the residue of coal, brown coal, refining of petroleum and coal liquefaction, make the raw material of unslaked lime of Wingdale, calcium hydroxide, these two kinds of raw material crushing to 0～6mm are made into compound in proportion, add in the hot stove of oxygen and carry out drying, coking and calcination processing, generate unslaked lime and coke earlier, and then generate calcium carbide and synthetic gas.Though this patent proposes to make raw material with brown coal, must handle through coking, in fact still make carbon materials with the brown coal coke.Patent is that brown coal and limestone crushing to 0～6mm are made furnace charge, and wants in the excessive input stove.This not only needs corresponding mechanical means and consumes too much brown coal, and technology is quite complicated.
Purpose of the present invention provides the processing method of directly utilizing the brown coal raw coal to replace source of goods metallurgical coke in short supply, expensive electrogenesis in next life stone.
Technical characterictic of the present invention is exactly directly to make carbon materials with the brown coal raw coal, with known electric furnace and repeatedly feeding mode produce calcium carbide.Whole process 4 procedures that comprise batching, shove charge, operate and come out of the stove.Used electric furnace mainly is open stove, and also available sealed furnace or rich sealed furnace are produced.
1, batching
The raw material of producing calcium carbide is unslaked lime and brown coal raw coal.
Unslaked lime CaO content＞92%
MgO content＜1.6%
Granularity 3～40mm
Brown coal raw coal total moisture content Mt＜50%
Optimum value 35～40%
Butt fixed carbon content F Cd 〉=38%
Optimum value 38～65%
Butt volatile producibility Vd≤47%
Optimum value 20～47%
Dry basis ash content content Ad≤25%
Optimum value 15～25%
Granularity 13～100mm
The proportioning of furnace charge is to obtain by the molecular weight and the known principle of the reaction equation of producing calcium carbide.
The reaction formula of producing calcium carbide is as follows:
The proportioning calculation formula of furnace charge is as follows:
The calcium oxide of A-lime (CaO) content in the formula, %;
B-calcium carbide composition (CaC
2), %;
The fixed carbon content of C-carbon materials, %;
Free calcium oxide CaO content in the D-calcium carbide, %(sees Table).
The D value is 8～22%, generally gets 8～16%;
Lime loss amount during the E-shove charge, kg;
The E value generally gets 7%;
Carbon materials loss amount during the F-shove charge, kg;
The F value generally gets 8%.
Unslaked lime and brown coal raw coal are mixed even back shove charge by the proportioning that calculates.
2. shove charge
Calculate the proportioning of brown coal raw coal and unslaked lime according to the volume meter of electric furnace.These qualified two kinds of raw materials by after the proportioning metering, are delivered on the table and mixed.Adopt the mode shove charge that repeatedly feeds intake, promptly spare no effort to, add less, make the charge level in the stove keep certain height.Charge level is the steamed bun shape.Along with the sinking of furnace charge, can be clear that the material feeding mouth in electrode 3 circular molten baths on every side.
3. operation
Calcium carbide production is to carry out in electric furnace, must operate by known furnace operation rules.
High voltage electric is by the furnace transformer step-down.Low electric current is through short net annealed copper wire, contact tube and conducting jaw plate iontophoresis electrode.Borrow arc heat and resistance heat that furnace charge is heated to 1800～2300 ℃.For keeping stable furnace temperature, should keep arc light not expose, when reinforced, must feed intake to the place that open arc is arranged.
4. come out of the stove
Under 1800～2300 ℃ high temperature, brown coal raw coal and unslaked lime carry out chemical reaction and generate calcium carbide.After furnace charge adds, all occur at the furnace charge charge level under the situation of open arc, smelted again 20～30 minutes, make chemical reaction abundant, can come out of the stove at last.
The also available brown coal raw coal of the present invention instead of part coke is made carbon materials and is produced calcium carbide, and charge composition is calculated with reference to aforementioned formula, and operation is with aforementioned the same.
Compare with the technology of using the coke production calcium carbide, the present invention has the following advantages:
1. the price of brown coal is lower than coke (comprising the brown coal coke), is supplied with assurance in the brown coal producing region especially, can make the calcium carbide production cost reduce by 20～30%;
2. reactivity ratio's coke of brown coal is good, and is bigger than resistance, but in electric furnace fast reaction speed, saves energy can improve output about 10% relatively;
3. the sulphur content of brown coal and phosphorus content are all low than coke, can improve the quality of calcium carbide finished product.
4. the present invention utilizes the electric arc of electric furnace and the ratio resistance of brown coal to produce heat, and cost is lower than the hot stove of oxygen by the oxygen heat supply, and supply of electric power is also abundant than oxygen supply;
5. the present invention directly uses the brown coal raw coal without processing treatment to replace (or part replaces) coke to make carbon materials, does not need other standby host tool processing facility, the too much brown coal of also unlikely consumption.
Embodiments of the invention
The electric furnace production gas forming amount that now with the capacity is 1800kVA is that the calcium carbide of 2901/kg is an example, introduces implementation step of the present invention.
1. the raw material of Cai Yonging
The content 92% of unslaked lime CaO
The content 1.6% of MgO
Granularity 3～40mm
Brown coal raw coal total water Mt 40%
Butt fixed carbon FCd 65%
Butt volatile matter Vd 20%
Dry basis ash content Ad 15%
Granularity 13～100mm
2. the calculating of charge composition
Calculate the weight proportion of unslaked lime and brown coal raw coal by aforementioned charge composition formula.
If: unslaked lime is 100kg.
Known: the molecular weight of C is 12,3C=36;
The CaO molecular weight is 56,
CaC
2Molecular weight is 64,
Then
(3C)/(CaC
2) = 36/64 =0.563
(CaO)/(CaC
2) = 56/64 =0.375
By the charge composition formula
A=0.92 in the formula; B=0.7791; C=0.65; D=0.14;
E＝0.07;F＝0.08;W＝0.40
Substitution, then
X
＝ (56.3×0.7791÷0.65+0.08)/(87.5÷0.92×0.7791+0.07+0.14) × 100/(1-0.4) ＝151
Therefore, the weight ratio of unslaked lime and brown coal is 100: 151.
The total amount that feeds intake of electric furnace is 2100kg, by the proportioning of obtaining, needs unslaked lime 837kg, brown coal raw coal 1263kg.
3. shove charge and operation
With load weighted brown coal raw coal and unslaked lime pile up mix on the electric furnace table after, by the requirement of aforementioned shove charge, adopt repeatedly in the reinforced normal direction electric furnace to feed intake.Import the arc heat that low-tension current produced of electric furnace electrode and the resistance heat of brown coal raw coal furnace charge is heated to 1800～2300 ℃.Regulate the height of electrode with windlass, be stabilized between 1800～2300 ℃ to keep smelting temperature.Arc light exposes in the stove processing requirement is fed intake operate by aforementioned.In the middle of operation, disclose the material toggling layer with steel bar frequently, discharge the CO that produces in the calcium carbide production, make it to burn into CO at boiler face
2Discharge with flue dust the back.
Thrown in furnace charge, when bed of material surface all open arc occurred, the calcium carbide smelting process is just basic to be finished.Smelted under the condition that open arc all occurs 20～30 minutes again, the calcium carbide smelting process is finished fully, liquid calcium carbide can be come out of the stove.
Liquid calcium carbide flows in the calcium carbide pot through the fire door of electric furnace, gets final product fragmentation after the cooling, packs, dispatches from the factory.
Free calcium oxide CaO and calcium carbide composition CaC
2Relation with gas forming amount
The calcium carbide gas forming amount, l/kg 250 260 270 280 290 300 310 320
CaC
2，% 67.17 69.86 72.86 75.23 77.91 80.86 81.36 84.00
Free CaO, % 22 20 18 16 14 12 10 8
Claims (5)
1, a kind of technology of producing calcium carbide, it is characterized in that directly making carbon materials with the brown coal raw coal, in electric furnace, produce calcium carbide with unslaked lime, total water Mt＜50% of brown coal raw coal, butt fixed carbon content F Cd 〉=38%, dry basis ash content Ad≤25%, butt volatile matter Vd≤47%, brown coal granularity 13～100mm, unslaked lime granularity 3～40mm;
2, a kind of technology of the production calcium carbide described in claim 1, the optimum value that it is characterized in that the total water Mt of brown coal raw coal is 35～40%;
3, a kind of technology of the production calcium carbide described in claim 1 is characterized in that the optimum value of the butt fixed carbon content F Cd of brown coal raw coal is 38～65%, and the optimum value of dry basis ash content Ad is 15～25%, and the optimum value of butt volatile matter Vd is 20～47%;
4, a kind of technology of the production calcium carbide described in claim 1 is characterized in that furnace charge all drops in the electric furnace, waits whole bed of materials surface open arc all to occur, also will keep smelting temperature to come out of the stove after 20～30 minutes again;
5, a kind of technology of the production calcium carbide described in claim 1, the also available brown coal raw coal of its feature instead of part coke is made carbon materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN90102356A CN1017134B (en) | 1990-04-30 | 1990-04-30 | Prodction process of calcium carbide by use of brow coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN90102356A CN1017134B (en) | 1990-04-30 | 1990-04-30 | Prodction process of calcium carbide by use of brow coal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1046140A CN1046140A (en) | 1990-10-17 |
| CN1017134B true CN1017134B (en) | 1992-06-24 |
Family
ID=4877481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN90102356A Expired CN1017134B (en) | 1990-04-30 | 1990-04-30 | Prodction process of calcium carbide by use of brow coal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017134B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101172605B (en) * | 2007-09-28 | 2010-09-01 | 李书堂 | Method for producing calcium carbide |
| CN103708459B (en) * | 2013-12-25 | 2015-08-05 | 北京神雾环境能源科技集团股份有限公司 | Prepare the method for calcium carbide |
| CN103708458B (en) * | 2013-12-25 | 2016-06-15 | 神雾环保技术股份有限公司 | The method preparing carbide |
| CN105948051B (en) * | 2016-07-21 | 2018-04-20 | 神雾科技集团股份有限公司 | A kind of method that calcium lime powder and semi-coke powder prepare calcium carbide raw materials for metallurgy |
| CN112010309B (en) * | 2020-07-29 | 2022-03-29 | 陕西北元化工集团股份有限公司 | Calcium carbide quality control method |
-
1990
- 1990-04-30 CN CN90102356A patent/CN1017134B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1046140A (en) | 1990-10-17 |
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