Method and system for preparing calcium carbide

A calcium carbide and quicklime technology, applied in the direction of carbide, calcium carbide, etc., can solve the problems of unstable production process of calcium carbide furnace, too many pellets in calcium carbide furnace, etc. The effect of improving pellet strength

Pending Publication Date: 2017-11-17
SHENWU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in this process, the pellets formed in the molding section will be crushed to varying degrees in the subsequent conveying process. If they are directly fed into the calcium carbide furnace, more powder will be fed into the calcium carbide furnace pellets, which will cause the production process of the calcium carbide furnace. unstable

Method used

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  • Method and system for preparing calcium carbide
  • Method and system for preparing calcium carbide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] In this example, the figure 1 The system shown and figure 2 The shown method prepares calcium carbide, and concrete process is as follows:

[0072] The particle sizes of powdery medium-low rank coal and quicklime are shown in Table 2:

[0073] The raw material particle diameter of table 2 embodiment 1

[0074] raw material

-0.125mm

0.125-0.5mm

0.5-1.0mm

1.0-3.0mm

pulverized coal

45.7％

53.6

0.7％

-

quicklime

0.8％

39.7％

43.3％

16.2％

[0075] Mix the powdery medium-low rank coal, quicklime and binder uniformly in the intensive mixer (mixing device 1-1) and then place it in the pressure molding machine (ball pressing device 1-2) for extrusion molding, in which the hydraulic cylinder The pressure is 19MPa. The mass ratio of powdery medium-low rank coal, quicklime, and binder is 1.03:1:0.032.

[0076] The obtained pellets are first sieved by a 5×5mm first sieving device 2-1 and then conveyed by a belt, an...

Embodiment 2

[0080] In this example, the figure 1 The system shown and figure 2 The shown method prepares calcium carbide, and concrete process is as follows:

[0081] The particle sizes of powdery medium-low rank coal and quicklime are shown in Table 3:

[0082] The raw material particle diameter of table 3 embodiment 2

[0083] raw material

-0.125mm

0.125-0.5mm

0.5-1.0mm

1.0-3.0mm

pulverized coal

54.3％

45.1

0.6％

-

quicklime

2.0％

31.0％

47.5％

19.5％

[0084] The particle size of the powdery medium-low rank coal is ≤1mm, and the particle size of the quicklime is ≤3mm. The powdery medium-low rank coal, quicklime and binder are mixed uniformly in the intensive mixer (mixing device 1-1) and placed in the Extrusion molding in the pressure molding machine (ball pressing device 1-2), wherein the pressure of the hydraulic cylinder is 19MPa. The mass ratio of powdery medium-low rank coal, quicklime, and binder is 0.8:1:0.024. ...

Embodiment 3

[0089] In this example, the figure 1 The system shown and figure 2 The shown method prepares calcium carbide, and concrete process is as follows:

[0090] The particle sizes of powdery medium-low rank coal and quicklime are shown in Table 4:

[0091] The raw material particle diameter of table 4 embodiment 3

[0092] raw material

-0.125mm

0.125-0.5mm

0.5-1.0mm

1.0-3.0mm

pulverized coal

54.3％

45.1

0.6％

-

quicklime

2.0％

31.0％

47.5％

19.5％

[0093] The particle size of powdery medium-low rank coal is ≤0.5mm, and the particle size of quicklime is ≤1mm. Mix powdery medium-low rank coal, quicklime and binder in a strong mixer (mixing device 1-1) and place Extruded in a pressure molding machine (ball pressing device 1-2), wherein the pressure of the hydraulic cylinder is 19MPa. The mass ratio of powdery medium-low rank coal, quicklime, and binder is 1.2:1:0.029.

[0094] The obtained pellets are first sieved by ...

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Abstract

The invention discloses a method and system for preparing calcium carbide. The method comprises the following steps of mixing pulverized coal, quicklime and a binder and then conducting compression moulding to obtain a pellet; sifting the pellet to obtain a first pellet and a first powder material; sifting the first ball pellet for the second time to obtain a second pellet and a second powder material; adding the first powder material and the second powder material into the pulverized coal, the quicklime and the binder for preparing the pellet; conducting pyrolysis on the second pellet to obtain coke-oven gas and a high-temperature active pellet; conducting calcium carbide smelting on the high-temperature active pellet to obtain liquid calcium carbide and calcium carbide furnace gas. According to the method and system for preparing calcium carbide, grizzly devices are arranged at an outlet of a ball-pressing device and an inlet of a ball material pyrolysis unit, the content of powder materials in the pellets is reduced before pyrolysis, the problems of being inflammable and easily damaged because of sifting of the high-temperature pellet are avoided, and safe and stable running of a calcium carbide smelting unit is ensured.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method and system for preparing calcium carbide. Background technique [0002] At present, the raw materials for calcium carbide smelting are mainly high-quality lump semi-coke and lump quicklime. Not only the cost of raw materials is high, but also the contact area between lump semi-coke and quicklime is small, and the heat transfer rate is slow, resulting in high reaction temperature and high power consumption. Moreover, most of the volatile matter in coal is discharged into the atmosphere in the form of exhaust gas and dust, which brings serious environmental problems. Therefore, the current calcium carbide production process has the disadvantages of high temperature, high energy consumption, and high pollution. [0003] In response to these problems, researchers at home and abroad have done a lot of useful explorations, such as using low-quality medi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/942
Inventor 刘维娜丁力郭启海许修强吴道洪
Owner SHENWU ENVIRONMENTAL TECH CO LTD
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