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

Preparation method of calcium hydroxide powder with high reactivity and high specific surface area

A technology of high specific surface area and calcium hydroxide, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of small specific surface area and inability to effectively purify flue gas, and achieve high specific surface area and high reaction Sexuality and the effect of reducing production costs

Pending Publication Date: 2019-08-02
HUNAN HENGSHAN BICHENG CALCIUM IND CO LTD
View PDF5 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcium hydroxide powder prepared by conventional methods has a small specific surface area and cannot effectively purify flue gas

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
  • Preparation method of calcium hydroxide powder with high reactivity and high specific surface area

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] see figure 1 , a preparation method of calcium hydroxide powder with high reactivity and high specific surface area, comprising the following steps:

[0022] (1) Pulverization: Pulverize the calcined quicklime, and the particle size of the pulverized quicklime is controlled at 300-1000 mesh;

[0023] (2) Digestion: Digest the crushed quicklime; first add 4~7% propylene glycol and 2~4% triethanolamine to the digestion water, and then use a premixed water-material ratio of 0.55~0.70 The machine mixes quicklime and digestion water and enters the digester; the stirring speed of the digester is 700 rpm-800 rpm, the outlet temperature of the digester is 90°C, and the digestion time is 9-12min; The pressure of the cut-off point of the water used is controlled at 2 bar G, and the fluctuation is 0.3 bar; in the digester, lime reacts with water to produce slaked lime, and its chemical equation is below 350°C:

[0024] CaO+H 2 O→Ca(OH) 2 +276 (kcal / kg CaO);

[0025] (3) Dryin...

Embodiment 1

[0030] A preparation method of calcium hydroxide powder with high reactivity and high specific surface area, comprising the following steps:

[0031] (1) Pulverization: Pulverize the calcined quicklime, and the particle size of the pulverized quicklime is controlled at 300-1000 mesh;

[0032] (2) Digestion: Digest the crushed quicklime, and control the content of quicklime for digestion at 91~96%; first add 5.5% propylene glycol and 2.5% triethanolamine to the digestion water, and then use the water-material ratio of 0.6 Ratio, use a pre-mixer to mix quicklime and digestion water, and enter the digester; the stirring speed of the digester is 750 rpm, the outlet temperature of the digester is 90°C, and digest for 10 minutes; the water temperature of the digestion water is controlled at 90°C throughout the process, and the The pressure at the cut-off point is controlled at 2bar G, with a fluctuation of 0.3bar; in the digester, lime reacts with water to produce slaked lime. Below...

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
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of calcium hydroxide powder with high reactivity and high specific surface area. The preparation method comprises steps as follows: (1) crushing: calcinedquick lime is crushed; (2) digestion: the crushed quick lime is digested; firstly, a chemical additive is added to water for digestion and the quick lime and water for digestion are mixed by a premixer in the water-material ratio being 0.55-0.70, the mixture enters a digester to be digested for 9-12 min, wherein the stirring rotation speed of the digester is 700-800 r / min, and the outlet temperature of the digester is 90 DEG C; (3) drying and crushing: the digested calcium hydroxide is dried at the temperature of 80-110 DEG C and crushed; (4) grading: the dried and crushed calcium hydroxide isgraded in a grader at the rotation speed of 1,000-1,200 r / min, and the calcium hydroxide powder with high reactivity and high specific surface area is obtained. The calcium hydroxide powder with highreactivity and high specific surface area is obtained by controlling proper water-material ratio, the digestion temperature, the digestion time and other digestion process parameters.

Description

technical field [0001] The invention belongs to the technical field of calcium hydroxide preparation, and in particular relates to a preparation method of calcium hydroxide powder with high reactivity and high specific surface area. Background technique [0002] The specific surface area of ​​calcium hydroxide powder material has a crucial influence on the flue gas purification and ability. Generally speaking, the larger the specific surface area of ​​calcium hydroxide, the better the effect of purifying flue gas. In addition, in terms of water treatment and environmental pollution control, calcium hydroxide with a high specific surface area can also better remove pollutants in water and the environment. Calcium hydroxide powder prepared by conventional methods has a small specific surface area and cannot effectively purify flue gas. Contents of the invention [0003] Aiming at the deficiencies in the prior art, the present invention provides a method for preparing calci...

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): C04B2/04C01F11/02
CPCC04B2/04C01F11/02C01P2006/12
Inventor 邓金营邓长征杨雷
Owner HUNAN HENGSHAN BICHENG CALCIUM IND CO LTD
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