Preparation method of dry powder phosphogypsum base cementing material

A technology of composite cementitious materials and phosphogypsum, which is applied in the field of preparation of dry powdered phosphogypsum-based cementitious materials, can solve problems such as insufficient strength and limited application range, and achieve the effect of improving strength performance and reducing stacking pressure

Active Publication Date: 2015-07-15
TONGLING CHEM IND GRP
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the strength is not high enough, which limits the scope of use

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 dry powder phosphogypsum base cementing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The percentages used below are all percentages by weight.

[0016] The phosphogypsum used in the present invention is the phosphogypsum discharged by Anhui Liuguo Chemical Industry Co., Ltd. by utilizing low-grade Yichang phosphate rock to produce diammonium phosphate. The specific components are as follows:

[0017] CaO:29.22%, SO 3 :44.10%,P 2 o 5 : 1.02%, F: 1.28%, SiO 2 :2.51%,Al 2 o 3 :0.81%,Fe 2 o 3 : 1.05%, MgO: 1.37%, Na 2 O:0.36%

[0018] Each embodiment of the present invention is carried out according to the following process flow: after the wet phosphogypsum is first broken, it is neutralized and formed, and the free water is removed in a drying kiln at a low temperature (40°C-80°C) to control the free water. The water content is not more than 1%. The following table 1 is the preparation example of dry basis phosphogypsum.

[0019] Table 1 The content of hemihydrate gypsum in dry basis phosphogypsum obtained by drying at different temperatures

...

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
flexural strengthaaaaaaaaaa
compressive strengthaaaaaaaaaa
flexural strengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of a dry powder phosphogypsum base cementing material. The preparation method comprises the following steps: mixing a composite cementing material consisting of dry base phosphogypsum, blast furnace slag powder, silicate cement, limestone flour and quicklime with a coagulant in proportion, and grinding to obtain a mixture, wherein the coagulant is high alumina cement or sodium metaaluminate, the dry base phosphogypsum is prepared through low-temperature drying, and the temperature of a phosphogypsum material during drying is not more than 80 DEG C. The cementing material meets index requirements of 42.5 general-purpose silicate cement, can be used for replacing cement in a wide field, and can consume a lot of phosphogypsum, so that the cementing material is favorable for reducing the phosphogypsum stacking pressure of a phosphate fertilizer enterprise.

Description

technical field [0001] The invention relates to a phosphogypsum-based gelling material, in particular to a preparation method of a dry powder phosphogypsum-based gelling material. Background technique [0002] Phosphogypsum is a solid material discharged as a by-product during the wet-process phosphoric acid production process, and its main component is calcium sulfate dihydrate (CaSO 4 2H 2 O), the treatment and utilization of phosphogypsum is a worldwide problem. At present, the main application fields of phosphogypsum are cement retarder, construction gypsum powder and further used in gypsum products such as paper gypsum boards. The application of phosphogypsum in these fields is far from meeting the needs of phosphogypsum treatment and utilization. The comprehensive utilization rate is less than 30%, and it is urgent to develop new application fields of phosphogypsum. [0003] As the most commonly used cementitious material, cement has a wide range of applications and...

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 Patents(China)
IPC IPC(8): C04B11/30
Inventor 胡成军石庆忠潘建罗根宏姜跃孙荣
Owner TONGLING CHEM IND GRP
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