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Hydraulic lime and production method thereof

A technology of hydraulic lime and production method, which is applied in the field of building materials, can solve the problems of high cost of hydraulic lime, and achieve the effects of good frost resistance, low production cost, and high water resistance

Inactive Publication Date: 2020-06-30
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, one of the objectives of the present invention is to provide a hydraulic lime production method with simple process and low production cost for the high cost of producing hydraulic lime in the existing process

Method used

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  • Hydraulic lime and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0040] 1) According to the required mass ratio of calcium oxide and silicon oxide of 0.89, papermaking lime mud and clay are mixed;

[0041] 2) The raw material is ground for 1.5 hours, and the residue to 180 mesh sieve is 2%;

[0042] 3) Preheating and decomposing the raw meal in a high-temperature furnace at 900°C for 0.5 hours;

[0043] 4) After preheating and decomposing, calcining at 1050°C for 0.5 hours; after calcination, naturally cool to room temperature and measure the free calcium oxide content;

[0044] 5) Digest in an environment with a humidity of 65%, record the weight change of the product before and after digestion, and when the digestibility of free calcium oxide in the product reaches 98%, the digestion ends;

[0045] 6) After digestion and drying, grind for 2.3 hours, when the 0.2mm sieve residue does not exceed 2%, and the 0.09mm sieve residue does not exceed 15%, the hydraulic lime is obtained.

example 2

[0047] 1) According to the required mass ratio of calcium oxide and silicon oxide of 1.0, papermaking lime mud and clay are mixed;

[0048] 2) The raw material is ground for 1.5 hours, and the residue to 180 mesh sieve is 2%;

[0049] 3) Preheating and decomposing the raw meal in a high-temperature furnace at 900°C for 0.5 hours;

[0050] 4) After preheating and decomposing, calcining at 1050°C for 0.5 hours; after calcination, naturally cool to room temperature and measure the free calcium oxide content;

[0051] 5) Digest in an environment with a humidity of 65%, record the weight change of the product before and after digestion, and when the digestibility of free calcium oxide in the product reaches 98%, the digestion ends;

[0052] 6) After digestion and drying, grind for 2.3 hours, when the 0.2mm sieve residue does not exceed 2%, and the 0.09mm sieve residue does not exceed 15%, the hydraulic lime is obtained

example 3

[0054] 1) According to the required mass ratio of calcium oxide and silicon oxide of 1.20, papermaking lime mud and clay are mixed;

[0055] 2) The raw material is ground for 1.5 hours, and the residue to 180 mesh sieve is 2%;

[0056] 3) Preheating and decomposing the raw meal in a high-temperature furnace at 850°C for 0.5 hours;

[0057] 4) After preheating and decomposing, calcining at 1050°C for 0.5 hours; after calcination, naturally cool to room temperature and measure the free calcium oxide content;

[0058] 5) Digest in an environment with a humidity of 65%, record the weight change of the product before and after digestion, and when the digestibility of free calcium oxide in the product reaches 98%, the digestion ends;

[0059] 6) After digestion and drying, grind for 2.3 hours, when the 0.2mm sieve residue does not exceed 2%, and the 0.09mm sieve residue does not exceed 15%, the hydraulic lime is obtained

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Abstract

The invention provides hydraulic lime and a production method thereof. The method comprises the following steps of: mixing papermaking white mud and clay to prepare a raw material, wherein the mass ratio of calcium oxide to silicon oxide in the raw material is controlled to be 0.89-10.41, and the raw material comprises the following chemical components in percentage by mass: 32.45%-50.27% of calcium oxide, 4.83%-36.55% of silicon oxide and no more than 4.5% of aluminum oxide; and grinding the raw material, preheating, calcining at 950-1200 DEG C, cooling, digesting, drying, and grinding to obtain the hydraulic lime. According to the method, the papermaking white mud is used as a main raw material, and can be turned into wealth, so that reasonable utilization of resources is achieved, and the method is environmentally friendly, short in technological process and low in production cost.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to hydraulic lime and a production method thereof. Background technique [0002] Hydraulic lime can be used as a building material, and its main characteristics are different from lime and cement. Compared with lime, hydraulic lime has fast setting speed, good viscosity, strong adhesion, high water resistance and high mechanical strength; compared with cement, it can make walls breathable, keep breathing, facilitate the exchange of water vapor, and It has the characteristics of good frost resistance and alkali resistance, good flexibility, good processability, and strong self-repair ability. Due to the slow hardening rate of hydraulic lime, the heat of hydration is low, thereby avoiding the internal stress caused by rapid solidification, so that it has good toughness. [0003] In foreign countries, hydraulic lime can be used to replace cement to prepare deco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/34C04B7/36
CPCC04B7/34C04B7/36
Inventor 卢忠远李军牛云辉罗凯
Owner SOUTHWEAT UNIV OF SCI & TECH
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