Method for carrying out solid-liquid separation on high-temperature alpha gypsum slurry

A technology of solid-liquid separation and gypsum slurry, which is applied in the field of gypsum production and processing, can solve the problems of material scrapping, achieve low moisture content, and eliminate the effects of temperature and time conditions

Active Publication Date: 2015-01-28
湖南昌迅科技环保股份有限公司
View PDF3 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is to use a vacuum belt conveyor to separate solid-liquid from medium-low temperature (below 97°C) gypsum slurry. At present, no one has used this technology to separate solid-liquid from gypsum slurry at high temperature.
Because the vacuum belt machine does not take heating and heat preservation me

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 carrying out solid-liquid separation on high-temperature alpha gypsum slurry
  • Method for carrying out solid-liquid separation on high-temperature alpha gypsum slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for solid-liquid separation of α-gypsum high-temperature slurry, using the following steps:

[0035] (1) First crystallization. Grinding gypsum ore, desulfurized gypsum or phosphogypsum into dihydrate gypsum powder with a particle size distribution between 10-100 μm, and mixing dihydrate gypsum powder with water in a mixing tank to form a gypsum slurry with a concentration of 30-40%. And heated to 30 ℃ ~ 100 ℃, the mixed gypsum slurry enters the reaction kettle through the slurry pump, under the conditions of temperature 90 ℃ ~ 150 ℃, pressure 3.0 ~ 5.0MPa, and in the crystal transformation agent maleic anhydride Under the action of the first crystallization, about 98% of α-gypsum slurry is generated.

[0036](2) Secondary crystallization. On the basis of the first crystallization, the generated α-gypsum slurry enters another reactor, and under the conditions of temperature 110°C-150°C and pressure 3.0-4.0MPa, secondary crystallization is carried out under th...

Embodiment 2

[0044] A method for solid-liquid separation of α-gypsum high-temperature slurry, using the following steps:

[0045] (1) First crystallization. Referring to Example 1.

[0046] (2) Secondary crystallization. Referring to Example 1.

[0047] (3) High temperature dehydration, solid-liquid separation. Put the high-temperature α-gypsum slurry on the vacuum belt conveyor. At this time, the temperature of the slurry is 110°C-150°C, and the vacuum degree of the vacuum box under the vacuum dehydration belt is 0-1MPa;

[0048] The vacuum dehydration belt starts to dehydrate the high-temperature α-gypsum slurry. At this time, the material on the vacuum belt conveyor must be kept warm and heated. The method of installing an insulation cover on the vacuum belt conveyor and injecting high-temperature air is adopted. The heat transfer oil is used to directly heat the air. Let the air temperature reach 100 ℃ ~ 200 ℃, or directly pass in the hot flue gas with a temperature between 100 ℃ ~...

Embodiment 3

[0054] A method for solid-liquid separation of α-gypsum high-temperature slurry, using the following steps:

[0055] (1) First crystallization. Referring to Example 1.

[0056] (2) Secondary crystallization. Referring to Example 1.

[0057] (3) High temperature dehydration, solid-liquid separation. Put the high-temperature α-gypsum slurry on the vacuum belt conveyor. At this time, the temperature of the slurry is 110°C-150°C, and the vacuum degree of the vacuum box under the vacuum dehydration belt is 0.1MPa;

[0058] The vacuum dehydration belt starts to dehydrate the high-temperature α-gypsum slurry. At this time, the material on the vacuum belt conveyor must be kept warm and heated. The method of installing an insulation cover on the vacuum belt conveyor and injecting high-temperature steam is used to make the steam temperature reach 100 ℃ ~ 200 ℃; adopt pressure-holding measures while heat preservation and heating, the pressure-holding range is 1MPa; the material tempe...

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 discloses a method for carrying out solid-liquid separation on high-temperature alpha gypsum slurry. The method comprises the following steps: (1) carrying out primary crystallization; (2) carrying out secondary crystallization; (3) carrying out high-temperature dehydration and solid-liquid separation; (4) conveying the material; (5) enabling dehydrated mud-like alpha gypsum to enter a flash dryer. The keys are as follows: heat insulation covers are additionally installed on a vacuum belt conveyor and a belt conveyor, and heat insulation and heating are achieved by injecting high-temperature steam or high-temperature air or directly heating air; the temperature of the high-temperature steam or the high-temperature air is 100-260 DEG C; the material temperature of alpha semi-hydrated gypsum when passing through the vacuum belt conveyor and the belt conveyor is controlled between 97 DEG C and 150 DEG C. Solid-liquid separation of alpha gypsum slurry under the condition of high temperature can be achieved by adopting the method.

Description

technical field [0001] The invention relates to a production and processing method for gypsum, in particular to a solid-liquid separation method for α-gypsum high-temperature slurry. Background technique [0002] At present, the preparation of α-hemihydrate gypsum by the liquid phase method is a new type of high-strength gypsum preparation method. Gypsum powder and dihydrate gypsum powder are mixed with water in the mixing tank to form a gypsum slurry with a concentration of 30-40%, and heated to 30°C-100°C. In the container, under the conditions of temperature 90℃~150℃ and pressure 3.0~5.0MPa, the first crystallization is carried out under the action of crystal transformation agent maleic anhydride, and about 98% of α-gypsum slurry is formed. On the basis of the first crystallization, the generated α-gypsum slurry enters another crystal converter, and under the conditions of temperature 110°C-150°C and pressure 3.0-4.0MPa, secondary crystallization is carried out under the...

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): C04B11/02
Inventor 蔡雪飞李俊
Owner 湖南昌迅科技环保股份有限公司
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