A method of preparing calcium carbide by co-molding of carbide slag and coke powder

A technology of carbide slag powder and carbide slag, applied in the direction of carbide, calcium carbide, etc., can solve the problems of easy hydration of CaO, high cost of raw materials, small reaction area, etc. The effect of reaction temperature

Active Publication Date: 2015-08-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
View PDF8 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has the following disadvantages: 1. The preparation of raw material block quicklime needs to calcinate a large amount of high-quality limestone (high-purity CaCO 3 ); 2. The price of coke is expensive, and a considerable amount of coke powder (blue coke powder) that cannot be directly used is produced in the coke block making process, and the cost of raw materials is high; 3. The calcium carbide preparation process is a solid-phase endothermic reaction, and the two reactions The materials are all lumpy, and the reaction area is small, which makes the mass transfer and heat transfer efficiency of raw materials low, resulting in high energy consumption
[93112800.5] invented a method for preparing carbonized coke balls from calcium carbide slag. In order to increase the strength of CaO and coke powder after molding, although this method coated the carbon-containing CaO pellets to form a layer of CaCO 3 , but at the calcium carbide

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method of preparing calcium carbide by co-molding of carbide slag and coke powder
  • A method of preparing calcium carbide by co-molding of carbide slag and coke powder
  • A method of preparing calcium carbide by co-molding of carbide slag and coke powder

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] Carbide slag (Ca(OH) 2 Purity greater than 95%) crushing, sieving, sieving coke powder with a sieve, so that the particle size of the two raw materials is 0.2mm.

[0026] Add 1.5% acetic acid to the calcium carbide slag powder with the above particle size, stir well, then mix with coke powder according to the mass ratio of 4:1, and then add 20% modified starch and 6% water, stir well.

[0027]Put the mixed material into an embedding machine for cold press molding (the molding pressure is 45MPa), to obtain 30g of cylindrical green balls, and the cold strength of the green balls is greater than 10MPa. Put the green balls in an oxygen-filled drying oven, heat them up to 100°C at a rate of 20°C / min, and dry them at a constant temperature for 120 minutes.

[0028] Put the dried green balls in a muffle furnace and heat up to 550°C for 30 minutes at a constant temperature, then heat up to 950°C for 30 minutes at a constant temperature, and the calcination...

Example Embodiment

[0031] Example 2

[0032] Crush and sieve the slaked lime, and sieve the coke powder with a sieve, so that the particle size of the two raw materials is 0.2mm. Add 1.5% Ca(H 2 PO 4 ) 2 , fully stirred, and then batched with coke powder according to the mass ratio of 7:3, then added modified starch and 6% water respectively accounting for 20% by weight of the mixture, and fully stirred evenly.

[0033] The mixed material was cold-pressed in an embedding machine (the molding pressure was 45 MPa), and 30 g of cylindrical green balls were obtained. Put the green balls in an oxygen-filled drying oven, heat them up to 120°C at a rate of 20°C / min, and dry them at a constant temperature for 120 minutes.

[0034] Put the dried green balls in a muffle furnace and heat up to 600°C for 30 minutes at a constant temperature, then heat up to 1000°C for 30 minutes at a constant temperature, and the calcination atmosphere is N 2 or CO 2 or Ar.

[0035] The calcined pellets (cooked pelle...

Example Embodiment

[0037] Example 3

[0038] Carbide slag (Ca(OH) 2 Purity greater than 95%) crushing, sieving, sieving coke powder with a sieve, so that the particle size of the two raw materials is 0.15mm.

[0039] Add 1.5% acetic acid to the calcium carbide slag powder of the above particle size, stir well, and then mix with coke powder according to the mass ratio of 7:3, and then add ethylene coal tar, coal tar and coal tar pitch accounting for 10% by weight of the mixed material And account for the water of 5% by weight of the mixed material, fully stir evenly.

[0040] The mixed material was cold-pressed in an embedding machine (the molding pressure was 45 MPa), and 30 g of cylindrical green balls were obtained. Put the green balls in an oxygen-filled drying oven, heat them up to 100°C at a rate of 20°C / min, and dry them at a constant temperature for 120 minutes.

[0041] Put the dried green balls in a muffle furnace and heat up to 550°C for 30 minutes at a constant temperature, then he...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method of preparing calcium carbide by co-molding of carbide slag (Ca(OH)2) and coke powder (biochar and semicoke). The method includes preparing carbon-containing carbide slag (green pellets) by co-molding of purified and modified carbide slag and the coke powder by adoption of an organic binder, calcinating, dehydrating, solidifying to prepare carbon-containing block CaO (processed pellets), and preparing the calcium oxide carbon-containing pellets heat intensity of which at 1000 DEG C is higher than 3 MPa into the calcium carbide in an electric furnace at 1800-1900 DEG C.

Description

technical field [0001] The invention is a chemical production technology for preparing calcium carbide by mixing and co-molding calcium carbide slag and coke powder with an organic binder. Background technique [0002] Calcium carbide is an important chemical raw material for the production of acetylene. With the development of the PVC industry, calcium carbide-based PVC accounts for about 70% of the total output. In recent years, the output of calcium carbide has continued to increase. In 2013, its output reached 22.34 million tons. At present, the main method for industrially preparing calcium carbide is the electrothermal method: use block calcium oxide and block coke as raw materials, use an electric furnace to heat the mixed raw materials to 2000-2200°C, and generate molten calcium carbide after several hours. The reaction formula is 3C+CaO =CaC 2 +CO. This process has the following disadvantages: 1. The preparation of raw material block quicklime needs to calcinate a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B31/32C01B32/942
Inventor 汪玉华公旭中王志王明涌任丽会
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap