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Method for preparing solid calcium carbide

A calcium carbide, solid-state technology, applied in the direction of carbide, calcium carbide, etc., can solve the problems of electrode erosion, harsh raw material requirements, waste of resources, etc., to achieve the effect of increasing specific surface area and contact area, reducing reaction activation energy, and improving production efficiency

Active Publication Date: 2015-04-29
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The defects of this production process are manifested in several aspects: First, the requirements for raw materials are harsh. The requirements of the traditional process for carbon materials are fixed carbon content ≥ 84%, ash content ≤ 15%, and volatile content ≤ 1.6%, which can meet these requirements Only coke, semi-coke and some high-quality anthracite coal are available, and the reserves of these raw materials are very limited and expensive; second, the thermal efficiency of the electric furnace is only 50%, and the power consumption is as high as 3250kWh / t calcium carbide; third, during the raw material crushing process, there will be Accompanied by 15-20% of the raw materials are discarded because the particle size is less than 5mm, resulting in a serious waste of resources; fourth, the produced calcium carbide products are in liquid state, which seriously corrodes the furnace and electrodes; in addition, the treatment of liquid calcium carbide requires cooling in a calcium carbide crucible , demoulding, crushing and other processes, the process is complex and the environment is seriously polluted

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  • Method for preparing solid calcium carbide

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preparation example Construction

[0041] The method for preparing solid calcium carbide according to the embodiment of the present invention uses lignite, bituminous coal or long-flame coal with low fixed carbon and high volatile content as the carbon material for producing calcium carbide. For raw materials with fixed carbon content ≥ 84%, the cost can be reduced by more than 50%;

[0042] The method for preparing solid calcium carbide according to the embodiment of the present invention makes full use of the fine-grained materials discarded in the traditional process, turning waste into treasure. In the process of smelting calcium carbide in the traditional calcium carbide furnace, the particle size of the raw material entering the electric furnace is strictly controlled, and 10 ~20% of the carbon material and lime less than 5mm cannot enter the electric furnace for smelting, and this part of the raw material is discarded or needs to be used in a small amount by complex processes such as hollow electrode feed...

Embodiment 1

[0052]Bituminous coal and quicklime with a particle size of less than 1 mm were finely ground by jet mill respectively to obtain bituminous coal powder and quicklime powder whose particle size was less than 30 microns accounting for more than 98.19%. Among them, the industrial analysis of bituminous coal is shown in Table 1. The CaO content of the quicklime is 90.89wt%, and then the bituminous coal powder and the quicklime powder are transported to the batching tank through gas, and mixed according to the weight ratio of quicklime powder:bituminous coal powder=125:100, and then the prepared mixture is sent to the moistening tank by air flow. In the mill, use a water pipe to add 8wt% tar in the lubricating mill (the rotating speed of the lubricating mill is 33r / min, and the medium filling rate is 12%) in the lubricating mill at the feeding position of the lubricating mill to lubricate for 10min to obtain the mixed material, and then The obtained mixed material is transferred fro...

Embodiment 2

[0057] Bituminous coal and quicklime with a particle size below 1 mm are finely ground respectively by jet mill to obtain respectively bituminous coal powder and quicklime powder with particle diameters below 10 microns accounting for more than 99.75%, wherein bituminous coal and quicklime are the same as in Example 1, and then The bituminous coal powder and quicklime powder are transported to the batching tank through gas, and mixed according to the weight ratio of quicklime powder: bituminous coal powder = 125:100, and then the prepared mixture is sent to the moistening mill by the air flow, and then enters into the moistening mill. Add 8wt% tar (the speed of the lubricating mill is 33r / min, and the medium filling rate is 12%) into the lubricating mill by using a water pipe to lubricate the material for 10 minutes to obtain the mixed material, and then transfer the obtained mixed material from the material tank To the feed bin at the top of the disc granulator, wherein the pa...

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Abstract

The invention discloses a method for preparing solid calcium carbide. The method comprises the following steps: (1), finely grinding a carbon material and a calcareous material so as to respectively obtain a carbon material powder and a calcareous material powder; (2), mixing and then wet-grinding a mixture containing the carbon material powder and the calcareous material powder, and a bonding agent so as to obtain a mixed material; (3), performing molding on the mixed material so as to obtain material balls; (4), successively distributing the material balls in a rotary hearth furnace, successively pyrolyzing the material balls in a pyrolysis furnace chamber of a radiant tube with the rotation of the bottom of the rotary hearth furnace, and smelting the pyrolyzed material balls in the chamber of a smelting furnace under a temperature of 1200-1380 DEG C, so as to finally obtain solid calcium carbide, coal gas and coal tar. The method disclosed by the invention can be used for preparing solid calcium carbide, the coal gas and the coal tar at the same time, and the production cost of the calcium carbide is obviously lowered.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular, the invention relates to a method for preparing solid calcium carbide. Background technique [0002] Calcium carbide is an important coal chemical product and basic chemical raw material. It is mainly used in the production of acetylene and acetylene-based chemical products, especially in the production of PVC (polyvinyl chloride). It was once known as the "mother of the organic synthesis industry". my country's energy is characterized by large coal reserves and small oil reserves, so the production of calcium carbide is of great significance to the development of the industrial economy. The output of calcium carbide has increased year by year in the past ten years. [0003] At present, the production of calcium carbide mainly adopts the electric furnace smelting method. The carbon-containing materials and calcium-containing materials with a particle size of 5-30mm are heated in th...

Claims

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Application Information

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IPC IPC(8): C01B31/32C01B32/942
Inventor 吴道洪曹志成任中山王静静薛逊
Owner SHENWU TECH GRP CO LTD
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