Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing calcium sulfate whiskers from acetylene sludge and waste sulfuric acid

A calcium sulfate whisker and waste sulfuric acid technology, which is applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problems of low comprehensive utilization efficiency of resources, low added value of products, harsh production conditions, etc., and achieve convenient The effect of industrialization promotion, low equipment requirements and high added value

Inactive Publication Date: 2016-04-13
HUNAN UNIV OF SCI & TECH
View PDF13 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In short, the current resource utilization of calcium carbide slag and waste sulfuric acid has problems such as low resource comprehensive utilization efficiency, harsh production conditions, high equipment requirements, low added value of products, and easy to produce secondary pollution.

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
  • Method for preparing calcium sulfate whiskers from acetylene sludge and waste sulfuric acid
  • Method for preparing calcium sulfate whiskers from acetylene sludge and waste sulfuric acid
  • Method for preparing calcium sulfate whiskers from acetylene sludge and waste sulfuric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Ca(OH) in the chemical composition of carbide slag in the present embodiment 2 Content 90%.

[0036] Carbide slag of the present invention and waste sulfuric acid prepare the method for calcium sulfate whisker, and its technological process is as follows figure 1 shown, including the following steps:

[0037] (1) Grinding the calcium carbide slag to 100 meshes, after sieving, it is prepared into a slurry with a mass percentage of 50%;

[0038] 2) The 3mol / L hydrochloric acid and the calcium oxide content in the calcium carbide slag slurry were mixed and reacted for 20 minutes at a molar ratio of 1.2:1. After the reaction was completed, the calcium chloride solution and acid leaching residue were obtained by filtering;

[0039] 3) After the waste sulfuric acid solution is decolorized and impurity-removed with activated carbon, it is prepared into a 9mol / L dilute sulfuric acid solution;

[0040] 4) Under the stirring condition of 200r / min, slowly drop the dilute sulfur...

Embodiment 2

[0046] Ca(OH) in the chemical composition of carbide slag in the present embodiment 2 Content 90%.

[0047] Carbide slag of the present invention and waste sulfuric acid prepare the method for calcium sulfate whisker, and its technological process is as follows figure 1 shown, including the following steps:

[0048] (1) Grinding the calcium carbide slag to 100 mesh, after sieving, it is prepared into a slurry with a mass percentage of 25%;

[0049] 2) 2mol / L hydrochloric acid and calcium oxide content in the calcium carbide slag slurry were mixed and reacted for 20 minutes by acid leaching at a molar ratio of 1.6:1. After the reaction was completed, calcium chloride solution and acid leaching slag were obtained by filtering;

[0050] 3) After the waste sulfuric acid solution is decolorized and impurity-removed with activated carbon, it is prepared into a 2mol / L dilute sulfuric acid solution;

[0051] 4) Under the stirring condition of 200r / min, slowly drop the dilute sulfur...

Embodiment 3

[0057] Ca(OH) in the chemical composition of carbide slag in the present embodiment 2 Content 90%.

[0058] Carbide slag of the present invention and waste sulfuric acid prepare the method for calcium sulfate whisker, and its technological process is as follows figure 1 shown, including the following steps:

[0059] (1) Grinding the calcium carbide slag to 200 meshes, after sieving, it is prepared into a slurry with a mass percentage of 25%;

[0060] 2) Mix 1 mol / L hydrochloric acid and calcium oxide content in the calcium carbide slag slurry with a molar ratio of 1.6:1 for acid leaching and mixed reaction for 30 minutes, and filter to obtain calcium chloride solution and acid leaching residue after the reaction is completed;

[0061] 3) After the waste sulfuric acid solution is decolorized and impurity-removed with activated carbon, it is prepared into a 3mol / L dilute sulfuric acid solution;

[0062] 4) Under the stirring condition of 120r / min, slowly drop the dilute sulfu...

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

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
lengthaaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing calcium sulfate whiskers from acetylene sludge and waste sulfuric acid. The method includes the steps of grinding and screening the acetylene sludge, conducting an acid leaching hybrid reaction, removing impurities and decoloring the waste sulfuric acid, preparing and filtering calcium sulfate slurry, mixing the calcium sulfate slurry, synthesizing the calcium sulfate whiskers and the like. With the acetylene sludge and the waste sulfuric acid as main raw materials, the calcium sulfate whiskers are produced through a normal pressure and temperature acidizing method, the problems of environmental pollution and potential safety hazards caused by stacking and storing the acetylene sludge and the waste sulfuric acid for a long time are effectively solved, the process is simple, the requirement for equipment is low, and technological content and additional value of the calcium sulfate whiskers are high; the method is easy to industrialize, meets the requirement of the circular economy industrial policy in developing countries and has wide market prospects.

Description

technical field [0001] The invention relates to a method for preparing calcium sulfate whiskers from calcium carbide slag and waste sulfuric acid, in particular to a method for preparing calcium sulfate whiskers by using calcium carbide slag and waste sulfuric acid as raw materials and adopting a method of acidifying hydrochloric acid at normal temperature and pressure. Background technique [0002] Carbide slag is the calcium carbide slag that is converted into Ca(0H) after hydrolysis of calcium carbide to obtain acetylene gas during the production process of acetylene by the calcium carbide method. 2 The waste slag as the main component also contains impurities such as silicon, aluminum iron, magnesium and calcium carbonate. Carbide slag is strongly alkaline, the quantity is huge, the transportation cost is high, and it will cause secondary pollution; if it is piled up on the spot, it will often cause serious environmental pollution to the surrounding environment, which is...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/10C30B29/46C30B29/62
CPCC30B29/46C30B7/10C30B29/62
Inventor 伍泽广周金华吴湘江候英杰易重庆胡文豪
Owner HUNAN UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com