Method for preparing lime for calcium carbide by utilizing carbide slag

A technology of calcium carbide slag and calcium carbide slag slurry, which is applied in lime production and other directions, can solve problems such as affecting the quality of calcium carbide products, low product content, and unsatisfactory treatment results, and achieves the benefits of pelletizing, uniform particle size, economical Benefit and Social Benefit Significant effect

Inactive Publication Date: 2017-07-07
王光建
View PDF7 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above method, the purification and purification of calcium carbide slag is mainly through simple screening, sedimentation, centrifugal separation, filtration and other steps, and the treatment results of...

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for preparing lime for calcium carbide by utilizing calcium carbide slag, comprising the following steps:

[0035] S1: Dilute and stir, transport the dry calcium carbide slag powder to the mixing tank, add water and stir to obtain a calcium carbide slag slurry with a mass concentration of calcium carbide slag of 20%; dilution water includes tap water and supernatant water with a sulfur content of ≤0.02% discharged from vacuum dehydration;

[0036] S2: fine grinding and impurity removal, the calcium carbide slag slurry obtained in step S1 is wet-mechanically screened with a 100-mesh ternary vibrating screen to remove large particles of impurities, and the calcium carbide slag slurry after removing large particles flows into the mill for fine grinding processing, control The particle size in the calcium carbide slag slurry is ≤40μm;

[0037] S3: Purification and dehydration, the finely ground calcium carbide slag slurry is pumped into the hydrocyclone with a cycl...

Embodiment 2

[0042] A method for preparing lime for calcium carbide by utilizing calcium carbide slag, comprising the following steps:

[0043] S1: Dilute and stir, transport the calcium carbide slag wet slag (PVC wet production, the calcium carbide slag plate and frame filter press presses the water content to 40-50%) to the stirring tank, add water and stir to obtain a calcium carbide slag slurry with a mass concentration of 16%; dilute Water includes tap water and supernatant water with a sulfur content of ≤0.02% discharged from vacuum dehydration;

[0044] S2: fine grinding and impurity removal, the calcium carbide slag slurry obtained in step S1 is wet-mechanically screened with a 100-mesh ternary vibrating screen to remove large particles of impurities, and the calcium carbide slag slurry after removing large particles flows into the mill for fine grinding processing, control The particle size in the calcium carbide slag slurry is ≤40μm;

[0045] S3: Purification and dehydration, th...

Embodiment 3

[0050] A method for preparing lime for calcium carbide by utilizing calcium carbide slag, comprising the following steps:

[0051] S1: Dilute and stir, transport the calcium carbide slag slurry (PVC wet production, the moisture content of the carbide slag slurry is 80-85%) to the stirring tank, add water and stir to obtain a calcium carbide slag slurry with a mass concentration of 12%; dilution water includes tap water and vacuum dehydration The discharged supernatant water containing ≤0.02% sulfur;

[0052] S2: fine grinding and impurity removal, the calcium carbide slag slurry obtained in step S1 is wet-mechanically screened with a 100-mesh ternary vibrating screen to remove large particles of impurities, and the calcium carbide slag slurry after removing large particles flows into the mill for fine grinding processing, control The particle size in the calcium carbide slag slurry is ≤40μm;

[0053] S3: Purification and dehydration, the finely ground calcium carbide slag slu...

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 for preparing lime for calcium carbide by utilizing carbide slag, which comprises the following steps of: S1: adding water into the carbide slag and stirring to obtain carbide slag slurry of which mass concentration is 12 to 20%; S2: removing large-particle impurities in the carbide slag slurry by mechanical sieving, enabling the carbide slag slurry of which large-particles are removed to flow into a mill to carry out fine milling processing, and controlling a particle size of carbide slag particles into a range of not over 40mu m; S3: carrying out separation on the fine-milled carbide slag slurry by a cyclone hydraulic separator, enabling the purified carbide slag slurry to flow out via an overflow pipe, enabling the purified carbide slag slurry to enter a vacuum belt dehydrator to carry out dehydration so as to obtain carbide slag with water content of not over 15%; S4: adding a pelletizing agent into the dehydrated carbide slag, stirring, pelletizing into balls and drying; S5: calcining the dried carbide slag at a temperature of 900 to 1,000 DEG C to obtain the lime for the calcium carbide. The lime prepared by the method disclosed by the invention is low in impurity content, uniform in particle size, high in strength and good in activity, and can meet requirements of the lime for the calcium carbide.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing calcium carbide slag, a by-product of acetylene production, in particular to a method for preparing calcium carbide lime by using calcium carbide slag. Background technique [0002] Carbide slag is the waste residue produced in the PVC chemical production process. To produce 1 ton of PVC products, 1.5 tons of calcium carbide is consumed and 1.7 tons of calcium carbide slag is produced. For an enterprise with an annual output of 1.2 million tons of polyvinyl chloride resin, the annual production of carbide slag exceeds 2 million tons. The moisture content of these discarded calcium carbide slags (wet method) is 40%, which not only takes up valuable land resources, but also easily air-dried and take-off ash is piled up for a long time, causing pollution to the surrounding environment and groundwater. The "reduction, recycling, and harmless" disposal of calcium carbide slag is affected by th...

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): C04B2/10
CPCC04B2/005C04B2/104Y02P40/40
Inventor 王光建
Owner 王光建
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