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Method for preparation of raw materials for smelting calcium carbide

A technology of raw materials and calcium carbide, which is applied in the field of preparing calcium carbide smelting raw materials, and can solve problems such as poor quality of calcium carbide products, easy burning and overburning, and high calcium carbide smelting temperature

Active Publication Date: 2014-04-09
SHENWU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, shaft furnaces are mostly used in the industry for limestone calcination, and the particle size of limestone in the furnace is 70-150mm. The quicklime obtained has low activity and is easy to burn and overburn, resulting in high calcium carbide smelting temperature, high energy consumption, and poor quality of calcium carbide products.

Method used

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  • Method for preparation of raw materials for smelting calcium carbide
  • Method for preparation of raw materials for smelting calcium carbide
  • Method for preparation of raw materials for smelting calcium carbide

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preparation example Construction

[0040] According to the method for preparing calcium carbide smelting raw materials according to the embodiment of the present invention, the limestone is crushed to be below 3 mm, which effectively reduces the calcination temperature and reduces the calcination time;

[0041] According to the method for preparing calcium carbide smelting raw materials according to the embodiment of the present invention, the calcination process of limestone is combined with the pyrolysis process of raw coal, which improves the utilization rate of heat energy;

[0042] According to the method for preparing calcium carbide smelting raw materials according to the embodiment of the present invention, the calcination temperature distribution in the annular furnace is uniform, and the raw burning and over-burning rate of limestone are low;

[0043] According to the method for preparing calcium carbide smelting raw materials according to the embodiment of the present invention, the calcined quicklime...

Embodiment

[0048] raw material:

[0049] Limestone, the chemical composition of this limestone is shown in Table 1;

[0050] Long-flame coal, the main properties of this long-flame coal are shown in Table 2.

[0051] Table 1 Limestone chemical composition

[0052]

[0053] Table 2 Main properties of long-flame coal

[0054]

[0055] Preparation:

[0056] First, the long-flame coal is dried by an indirect tube-type drum drying device, the drying heat source is 0.8MPa saturated steam, and the moisture content of the long-flame coal after drying is 0.3%. The limestone and the dried long-flame coal are respectively crushed by a crusher, and the average particle size after crushing is 1-3 mm. Further, limestone particles and long-flame coal particles were mixed according to the mass ratio of 1:2.3 and then extruded to obtain a molding material with a particle size of 32×25×18 mm. The molding material was sent into the annular furnace, and the calcination process was carried out acc...

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Abstract

The invention discloses a method for preparation of raw materials for smelting calcium carbide. The method comprises the following steps: drying low-mid-rank coal to obtain dried low-mid-rank coal; crashing limestone and the dried low-mid-rank coal to respectively obtain limestone particles and low-mid-rank coal particles; mixing and molding the limestone particles and the low-mid-rank coal particles to obtain a molded material; putting the molded material into an annular furnace and calcining the molded material under an inert atmosphere to obtain high-calorific value synthetic gas, tar and calcium carbide smelting raw materials, wherein the calcium carbide smelting raw materials include semicoke and unslaked lime. Thus, the calcining temperature and calcining time of the limestone can be remarkably reduced, so that the production cost for preparing the calcium carbide smelting raw materials is lowered.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular, the invention relates to a method for preparing calcium carbide smelting raw materials. Background technique [0002] Lime (CaO) is the main raw material for calcium carbide production, which is usually obtained by calcination of limestone, chalk, shells, etc. At present, shaft furnaces are mostly used in the industry for limestone calcination, and the particle size of limestone in the furnace is 70-150mm. The quicklime obtained has low activity and is easy to burn and overburn, resulting in high calcium carbide smelting temperature, high energy consumption, and poor quality of calcium carbide products. . [0003] Therefore, the method for preparing calcium carbide smelting raw materials needs to be further improved. Contents of the invention [0004] The present invention aims at solving one of the above technical problems at least to a certain extent or at least providing a u...

Claims

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Application Information

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IPC IPC(8): C04B2/10C01B31/32C01B32/942
CPCY02P40/40
Inventor 吴道洪张佼阳丁力
Owner SHENWU ENVIRONMENTAL TECH CO LTD
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