Method for producing low combustion composite cement from waste concrete cement stone phase

A waste concrete and composite cement technology, which is applied in cement production, clinker production, etc., can solve the problems of low strength of dehydrated cement stone gelling system, failure to form mechanical properties, affecting gelling ability, etc., achieve low cost of raw materials, eliminate The problem of sticky ball sticking and grinding, the effect of high grinding efficiency

Active Publication Date: 2017-06-30
CHINA UNIV OF MINING & TECH +1
View PDF5 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The analysis shows that the root cause of the low strength of the dehydrated cement stone gelling system is that the particle hardness of the loose and porous dehydrated cement stone is extremely low. On the one hand, the particle size of the dehydrated cement stone after grinding is still relatively coarse, which affects its

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 producing low combustion composite cement from waste concrete cement stone phase
  • Method for producing low combustion composite cement from waste concrete cement stone phase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Preparation of low-fired composite cement

[0029] Use waste concrete cement stone phase to prepare low-fired composite cement. The composition and mass percentage of the cement raw materials are as follows: dehydrated cement stone powder 57%, dihydrate gypsum 3%, dihydrate gypsum 2%, mineral powder 28%, fly ash 10% .

[0030] The preparation process: the hardened cement stone powder separated from the waste concrete is calcined at a low temperature of 700 ° C for 1 hour to obtain dehydrated cement stone powder; the dehydrated cement stone powder is mixed with the above-mentioned raw materials according to the formula ratio and ground until the particle size exceeds 0.08 mm square hole sieve not more than 2%, specific surface area not less than 400m 2 / kg, that is, the low-fired composite cement. It is measured that the cement passes through a 0.08mm square hole sieve with a residue of 1.6% and a specific surface area of ​​410m 2 / kg. At the same time, the pure d...

Embodiment 2

[0041] Example 2 is basically the same as Example 1, except that the composition of cement raw materials and their mass percentages are: 50% of dehydrated cement stone powder, 5% of dihydrate gypsum, 3% of sodium sulfate, 40% of mineral powder, and 2% of red mud. %. The calcination time is 30min, and the calcination temperature is 800℃

Embodiment 3

[0042] Embodiment 3 is basically the same as Embodiment 1, except that the cement raw material composition and its mass percentage are: 70% of dehydrated cement stone powder, 2% of dihydrate gypsum, 1.5% of sodium sulfate, 25% of mineral powder, tailings sand or Coal gangue or quarry crushed stone chips 1.5%. The calcination time is 1.5h, and the calcination temperature is 600°C.

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
The average particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Login to view more

Abstract

A method for producing low combustion composite cement from a waste concrete cement stone phase belongs to the field of cement production, solves the problem of resource utilization of the waste concrete cement stone phase, and can also realize large dosage use of industrial waste residues. The low combustion composite cement comprises the following raw materials by weight: 50%-70% of dehydrated cement stone powder, 2%-5% of dihydrate gypsum, 1.5%-3% of anhydrous sodium sulphate, 25%-40% of mineral powder and 0%-20% of other mixtures. The low combustion composite cement has the advantages of simple preparation process, the waste concrete cement stone phase is efficiently used, the cement production cost is greatly reduced by low temperature firing technology, consumption of natural resources and environmental pollution can be effectively reduced, and the method has obvious low carbon environmental-friendly effects and remarkable comprehensive benefits.

Description

technical field [0001] The invention discloses a method for preparing low-fired composite cement by using waste concrete cement stone phase, which belongs to the field of cement production. Background technique [0002] With the implementation of the sustainable development strategy, the resource, energy and environmental problems brought by the cement industry have become the main factors restricting its development. Using less Portland cement clinker and using as much solid waste as possible to produce cement is a topic with environmental protection significance and economic value. As an important component of solid waste, the utilization of waste concrete is an important aspect of the current solid waste resource utilization. Recycled concrete technology can better solve the problem of recycling waste concrete, and is of great significance to protecting the environment and saving natural resources such as sand and gravel. However, it has not been realized for the cement ...

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): C04B7/14C04B7/147C04B7/24C04B7/26C04B7/43
CPCC04B7/14C04B7/147C04B7/246C04B7/26C04B7/43Y02P40/10Y02P40/121
Inventor 张领雷姬永生刘本琳殷允贺肖理坤刘翔宇
Owner CHINA UNIV OF MINING & TECH
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