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Cement production method

A production method and technology for cement raw meal, applied in cement production, clinker production and other directions, can solve the problems of high energy consumption, low liquid phase, slow reaction rate, etc., to reduce the amount of flue gas and dust, mass transfer Effect of increased heat transfer rate, reduced requirement for homogenization

Active Publication Date: 2014-09-03
GUIZHOU CHANHEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following problems: (1) the reaction time is long, generally 30 to 45 minutes, and the energy consumption is large; (2) the raw materials need to be fully homogenized to obtain a stable kiln raw meal, otherwise the cement quality will be affected; (3) Cement firing kilns are bulky and require high investment in equipment
(4) During the calcination process, the amount of liquid phase can generally only be controlled at about 22% to 26%, and the amount of liquid phase is low, resulting in low mass and heat transfer efficiency and slow reaction rate. If the amount of liquid phase is increased, the calcining The operation brings difficulties, such as agglomeration, ring formation, burning flow, etc., and it is easy to damage the calcination equipment, so that the cement production cannot be carried out smoothly.
(5) A large amount of hot air is generated during the cooling process of the clinker through the grate cooler, and the investment in waste heat utilization is large

Method used

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  • Cement production method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The limestone mine in Shifang, Sichuan, where the dry clay and iron slag are crushed by the jaw crusher into 10-30mm granular materials is transported into the raw material silo, and weighed as 80% limestone, 15% clay, and 5% iron ore by the belt. The proportion of slag is measured and batched, and the granular materials after batching are conveyed into the vertical pulverizer by the belt conveyor for grinding, and the fineness is controlled at 80um. The sieve residue is less than 2 , adjust the amount of coal injected by the coal injection gun placed in the calciner outside the kiln. The temperature in the calciner is 870°C, and the decomposed biomass falls into the melting and firing furnace.

[0040] Spray pulverized coal and pure oxygen into the spray gun submerged in the melt in the melting and firing furnace, and carry out submerged combustion for heat supply, and control the liquid phase temperature of the molten pool at 1450-1500°C to cause silicification of calci...

Embodiment 2

[0044]The calcite mine in Anxian County, Sichuan Province, the dry loess ore and iron slag from Shifang are crushed by the jaw crusher into 10-30mm granular materials and transported into the raw material silo, and weighed by the belt as 80% calcite, 15% loess, 5 The proportion of iron ore slag is measured and batched. The granular materials after batching are conveyed into the vertical pulverizer for grinding by the belt conveyor, and the fineness is controlled at 80um. The sieve residue is less than 2 , adjust the amount of CO gas injected into the spray gun in the calciner outside the kiln, the temperature in the calciner is 896°C, and the decomposed biomass falls into the melting and firing furnace.

[0045] To the spray gun submerged in the melting body in the melting and firing furnace, CO and 800°C combustion air are injected at high speed to carry out submerged combustion and heat supply, and the liquid phase temperature of the molten pool is controlled at 1370-1420°C to...

Embodiment 3

[0050] Dolomite ore (chalk), dry shale ore and sulfuric acid slag from Mianyang, Sichuan, where they are produced, are crushed by a jaw crusher into 10-30mm granular materials and transported to the raw material silo, and weighed as 80% dolomite and 15% page by belt measurement. Rock and 5% sulfuric acid slag are used for metering and batching, and the granular materials after batching are conveyed into the vertical grinding mill for grinding by the belt conveyor, and the fineness is controlled at 80um. The sieve residue is less than 2 , adjust the amount of natural gas injected into the spray gun placed in the calciner outside the kiln, the temperature in the calciner is 880°C, and the decomposed biomass falls into the melting furnace.

[0051] Spray natural gas and 50% oxygen-enriched air into the spray gun submerged in the molten body in the melting and firing furnace to carry out submerged combustion and heat supply, and control the liquid phase temperature of the molten poo...

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Abstract

The invention relates to a novel cement production method and belongs to the technical field of cement production. The invention aims at solving the technical problem of reducing the energy consumption in the cement production process. The cement production method is characterized in that after being pre-heated and pre-decomposed, a cement raw meal is placed into a high-temperature molten pool at 1350DEG C to 1650DEG C to be transformed into molten mass; fuel and combustion-supporting gas are sprayed in through a spray gun which is immersed into the molten mass to provide energy; cement melting and sintering reaction is carried out; and the sintered molten clinker is cooled, proportioned and grinded continuously, thus producing the finished cement. The method adopts the full molten liquid phase reaction, the mass and heat transfer rate is greatly enhanced, the reaction time is short, and the transformation rate is high, thus enhancing the production capacity and saving a large amount of energy consumption.

Description

technical field [0001] The invention relates to a new cement production method and belongs to the technical field of cement production. Background technique [0002] Cement is a powdery hydraulic inorganic gelling material. It is an important basic building material and is widely used in civil engineering, water conservancy, and national defense. The annual demand for cement in my country is about 1.3 billion tons. [0003] Portland cement clinker is mainly composed of tricalcium silicate (C 3 S), dicalcium silicate (C 2 S), tricalcium aluminate (C 3 A) and tetracalcium aluminoferrite (C 4 AF) composition. Among them, tricalcium silicate is the main mineral of clinker, and its content is usually about 54% to 60%. Tricalcium silicate and tricalcium aluminate have high early strength, and dicalcium silicate and tetracalcium aluminoferrite have rapid strength growth in the later stage, among which the strength of tricalcium silicate is the highest among the four major mine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/36C04B7/44
CPCY02P40/121
Inventor 李进李光明王佳才邹建侯隽马永强
Owner GUIZHOU CHANHEN CHEM CO LTD
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