Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for squeezing to produce concrete retardation ball with chemical gypsum

A technology of chemical gypsum and retarding balls, applied in chemical instruments and methods, manufacturing tools, clay preparation equipment, etc., can solve the problems of affecting the output of cement mills, large amount of hemihydrate gypsum, and harsh production environment, etc. Large-scale production, low production energy consumption, and the effect of reducing environmental pressure

Inactive Publication Date: 2011-02-16
TONGLING CHEM IND GRP
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the amount of hemihydrate gypsum used in the actual production of the inventive pelletizing process is as high as 50%, not only the production cost is relatively high, but also the excessive amount of hemihydrate gypsum leads to serious agglomeration of the stock; in addition, the disc granulation process only relies on The gelling effect of the hemihydrate gypsum causes the moisture content of the retarding ball to be as high as 18%, which does not meet the requirements of the cement plant and affects the output of the cement mill; also because the amount of hemihydrate gypsum is relatively large, and the material is always in a state of decreasing In the state of rapid throwing, the dust pollution in the production process is serious, and the production environment is harsh

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

[0016] Embodiment 1: Take a part of phosphogypsum in the phosphogypsum slag field, containing 15% of free water, pH=3.5, mix it evenly with lime that accounts for 3% of the actual amount of phosphogypsum taken, and divide the obtained modified phosphogypsum The output part is processed into hemihydrate phosphogypsum, and then mixed evenly with the neutralized modified phosphogypsum, and the ratio of hemihydrate phosphogypsum and modified phosphogypsum is controlled to be 20:80; The phosphogypsum retarding balls were made by medium pressure. After testing: the compressive strength of the phosphogypsum retarding balls on the day was 19kg / piece, the moisture content was 9.35%, and the pH≥7; after 3 days, the compressive strength increased to 41kg / piece. It fully complies with the quality and storage and transportation requirements of cement retarding balls.

Embodiment 2

[0017] Embodiment 2: Take a part of phosphogypsum in the phosphogypsum slag field, containing 16% of free water, pH=3, mix it evenly with lime that accounts for 3% of the actual amount of phosphogypsum taken, and divide the obtained modified phosphogypsum The output part is processed into hemihydrate phosphogypsum, and then mixed evenly with the neutralized modified phosphogypsum, and the ratio of hemihydrate phosphogypsum and modified phosphogypsum is controlled to be 30:70; The phosphogypsum retarding balls were made by medium pressure. After testing: the compressive strength of the phosphogypsum retarding balls on the day was 18kg / piece, the moisture content was 8.1%, and the pH≥7; after 3 days, the compressive strength increased to 48kg / piece. It fully complies with the quality and storage and transportation requirements of cement retarding balls.

Embodiment 3

[0018] Embodiment 3: Take a part of sulfur gypsum in the sulfur gypsum slag field, containing 6% of free moisture, pH=6, mix it evenly with lime that accounts for 1% of the actual amount of sulfur gypsum taken, and obtain the modified sulfur gypsum wherein A part is processed into hemihydrate gypsum, and then mixed evenly with modified sulfur gypsum, and the ratio of hemihydrate sulfur gypsum and modified sulfur gypsum is controlled to be 6:94; the mixture of the two kinds of sulfur gypsum is pressed into sulfur Gypsum retarding balls, after testing: the compressive strength of gypsum retarding balls on the day was 16kg / piece, the moisture content was 5.0%, and pH≥7; after 3 days, the compressive strength increased to 38kg / piece. It meets the quality and storage and transportation requirements of cement retarding balls.

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 present invention discloses a chemical gypsum squeezing and manufacturing cement retarding ball method. The steps are as follows: lime is used to neutralize chemical gypsum until the pH is more than or equal to 7 and is stirred to be even, a modified chemical gypsum is obtained; then the modified chemical gypsum and half water gypsum are mixed and stirred to be even according to the weight proportion from 100 to 6 to 100 to 30. The content of free moisture which controls the mixed material is 5 to 11 percent and the pH is more than or equal to 7; the mixed material is directly pressed to molding. The present invention greatly reduces the dosage of half water gypsum and the production cost of cement retarding ball. The operation environment of factories which use pressing molding is improved. Because the balling making mechanism is changed, the liquid water content of products is greatly reduced, which is propitious to cement production and suitable for large-scale production. Large quantity of chemical gypsum in particular to phosphogypsum is transformed, which reduces pressure of environment.

Description

technical field [0001] The present invention relates to a kind of technology that uses chemical gypsum to make cement retarding ball, especially relates to a kind of technology that uses chemical gypsum and lime CaO, Ca(OH) 2 It is a process of making cement slow-setting balls by extrusion method as raw material. Background technique [0002] Add CaSO to cement clinker 4 2H 2 O or CaSO 4 As a retarder to adjust the setting time of cement, natural gypsum is a high-quality retarder, but natural gypsum is not only resource-intensive, but also expensive. In recent years, industrial by-product gypsum, namely chemical gypsum, has replaced natural gypsum to a certain extent, but chemical gypsum is basically a powdery substance containing a certain amount of free water and free acid, which must be neutralized with lime and must be made into certain specifications. The lumps are convenient for uniform feeding from the warehouse (the water-containing powdery materials are either a...

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): B28B3/20B28C1/04
Inventor 杨文斌胡成军叶丽君周斌施晰昕潘建鲁军罗自力石庆忠
Owner TONGLING CHEM IND GRP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com