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Pretreatment of Yellow River silt, concretion cementing material obtained therewith and their prepn

A technology of Yellow River silt and cementitious materials, which is applied in the field of cementitious materials, can solve the problems of slow reaction speed, setting and hardening time without engineering significance, etc.

Inactive Publication Date: 2007-01-03
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the Yellow River silt and silt are inert substances at normal temperature and pressure, the reaction speed is slow under the action of diagenetic fluid, and the setting and hardening time is not of engineering significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Combine 65% of the Yellow River silt with a particle size of 0-2000 μm, 25% of red mud, 5% of quicklime, 4.86% of natural dihydrate gypsum, 0.1% of sodium carbonate, and nitrous acid Potassium 0.02% and ferrous chloride 0.02% are wet-mixed together in a ball mill for 20 minutes, and then the mud is dehydrated. After the dehydrated mud is made into balls, hydrothermal alteration reaction is carried out in the rotary kiln. The reaction temperature is 700°C and the reaction time is 360 minutes. Mix and grind 80% of the mixed material that has undergone alteration reaction with 14.8% of blast furnace water-quenched slag, 0.2% of clinker and 5% of Ningshi C diagenetic agent to a specific surface area of ​​510m 2 / kg. The obtained mixed powder can be used as the finished gelatin cementitious material after homogenization and inspection. The properties that can be achieved by testing the strength and stability of the material according to the GB175-1999 standard are shown ...

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PUM

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Abstract

The present invention relates to pre-treatment of Yellow River silt, concretion cementing material obtained therewith and their preparation process. Yellow River silt in 30-90 wt%, salts connecting K+, Na+, Ca2+, Mg2+ and / or Fe2+ ion and acid radical ions in 0.1-5 wt%, and other material containing crystal water, hydroxide radical, hydroxyl group, CO22 or other volatile components in 5-60 wt% are mixed, and the mixture is then hydrothermal alteration reacted at 100-900 deg.c. Then, the hydrothermal alteration reacted material in 50-90 wt%, cement clinker in 0.1-29 wt%, blast furnace slag or other high temperature treated waste in 0-30 wt%, gypsum in 0-8 wt% and rock forming agent in 0.1-5 wt% are mixed and ground to obtain cement powder. The cement powder has high strength and high stability.

Description

technical field [0001] The invention relates to a cementitious material, more precisely, to a gelatinous cementitious material produced with Yellow River silt or silt as the main raw material and a preparation method thereof. Background technique [0002] In the Yellow River Basin of my country, 1.6 billion tons of mud and sand enter the downstream river every year. The Yellow River silt and sand for irrigation and dredging in various places also amounted to several million tons to tens of millions of tons. Although the technology of firing red bricks from the Yellow River mud and sand has been vigorously promoted by the government, due to the small scale and high cost, it still cannot be widely promoted in many places. The Chinese invention patent with the notification number 2642889 relates to an environmentally friendly hollow brick, which discloses a method for manufacturing a fired brick with non-through rectangular or square blind holes using the Yellow River mud and ...

Claims

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Application Information

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IPC IPC(8): C04B7/00C04B7/02C04B7/24
CPCC04B7/24C04B28/02Y02P40/10Y02W30/91C04B18/141
Inventor 孙恒虎倪文徐跃峰徐维瑞冯向鹏易忠来
Owner TSINGHUA UNIV
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