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Method for preparing special cement by circulating fluidized bed combustion ash

A technology of circulating fluidized bed and sulfur-fixing ash, which is applied in the direction of cement production, etc., can solve the problems of polluting air, water, soil and biological environment, occupying land resources, and restricting popularization and application, so as to solve the problems of resource shortage, raw material composition, etc. Less, more adaptable effect

Active Publication Date: 2012-11-21
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there are very few utilization technologies of circulating fluidized bed (CFB) sulfur-fixing ash, and a large amount of sulfur-fixing ash is in a state of simple stacking and random discharge, which not only occupies a large amount of land resources, but also pollutes the atmosphere, water, soil and biological environment, and even endanger human health
If these sulfur-fixing ash are not comprehensively treated and utilized, it will definitely cause secondary pollution to the environment, and will also restrict the popularization and application of fluidized bed coal-fired sulfur-fixing technology

Method used

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  • Method for preparing special cement by circulating fluidized bed combustion ash
  • Method for preparing special cement by circulating fluidized bed combustion ash
  • Method for preparing special cement by circulating fluidized bed combustion ash

Examples

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Effect test

Embodiment 1

[0030] A method for preparing special cement by utilizing a circulating fluidized bed sulfur-fixing ash, comprising the following steps:

[0031] a, batching: take each component according to the raw material composition and mass percentage example of limestone 45%, sulfur-fixing ash slag 40%, bauxite 15%, respectively broken and ground (broken and ground to 80 μ m sieve residue is less than 6%) after Mix evenly to obtain a mixture;

[0032] b. Calcining: place the mixed material at a temperature of 1100-1450° C. for 60 minutes, and cool (preferably place in air for rapid cooling) to obtain clinker;

[0033] c. Cement making: Take clinker and grind it finely (ground until the specific surface area is 350-450m3) 2 / kg), that is, to make special cement.

Embodiment 2

[0035] A method for preparing special cement by utilizing a circulating fluidized bed sulfur-fixing ash, comprising the following steps:

[0036] a, batching: take each component according to the raw material composition and mass percentage of limestone 70%, sulfur-fixing ash 25%, bauxite 5%, after crushing and grinding (crushing and grinding to 80 μm sieve is less than 6%) Mix evenly to obtain a mixture;

[0037] b. Calcination: place the mixture at a temperature of 1100-1450°C for 30 minutes and then cool to obtain clinker;

[0038] c. Cement making: Take clinker and grind it finely (ground until the specific surface area is 350-450m3) 2 / kg), that is, to make special cement.

Embodiment 3

[0040] A method for preparing special cement by utilizing a circulating fluidized bed sulfur-fixing ash, comprising the following steps:

[0041] a. Ingredients: take each component according to the raw material composition and mass percentage of 60% limestone, 30% sulfur-fixing ash slag, and 10% bauxite, and crush and grind them respectively (the crushed and ground to 80 μm sieve is less than 6%) Mix evenly to obtain a mixture;

[0042] b. Calcination: place the mixture at a temperature of 1100-1450°C and calcinate for 50 minutes, then cool to obtain clinker;

[0043] c. Cement making: Take clinker and grind it finely (ground until the specific surface area is 350-450m3) 2 / kg), that is, to make special cement.

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Abstract

The invention discloses a method for preparing special cement by circulating fluidized bed combustion ashes, comprising the following steps: raw materials are taken out, which comprise the following components in percentage by weight: 45-75 wt% of limestone, 25-40 wt% of fluidized bed combustion ash and 0-15 wt% of bauxite; the raw materials are broken and levigated to be evenly mixed to prepare a mixed material; the mixed material is calcined at the temperature of 1100-1450 DEG C for 10-90 min, cooled and prepared into clinker; dihydrate gypsum which accounts for 0-15 wt% of cement is added into the clinker; and all the materials are mixed and levigated to prepare the special cement. The invention takes industrial waste residue-fluidized bed combustion ash as the raw material to prepare the special cement which takes Belite, calcium sulphoaluminate and iron phase as main minerals. The invention utilizes a great quantity of waste, lowers cement production cost, improves environment protection benefit, has low calcining heat and lowers energy consumption, and the prepared cement has favorable construction workability.

Description

technical field [0001] The invention belongs to a method for preparing cement containing combustion waste such as sulfide, and relates to a method for preparing special cement by using a circulating fluidized bed sulfur-fixing ash. It is suitable for preparing building materials - special cement with waste circulating fluidized bed sulfur-fixed ash as raw materials. Background technique [0002] Circulating fluidized bed combustion (CFBC for short) technology is an advanced clean coal-fired technology that fixes sulfur during the combustion process. It has wide adaptability to coal types, high combustion efficiency and sulfur fixation efficiency, and good load regulation performance. Low cost of sulfur fixation, etc., can effectively reduce coal-fired sulfur dioxide and NO X emissions, reduce air pollution, and benefit environmental protection, and have been vigorously developed and promoted. Circulating fluidized bed (CFB) coal-fired sulfur-fixed ash is the combustion rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/28
CPCY02P40/10
Inventor 卢忠远吕淑珍陈雪梅
Owner SOUTHWEAT UNIV OF SCI & TECH
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