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Method for producing cement

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

Active Publication Date: 2013-01-23
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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  • Method for producing cement

Examples

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Effect test

Embodiment 1

[0036] From the limestone mine in Pengzhou, Sichuan, the dry clay and iron slag are crushed by the jaw crusher into 10-30mm granular materials and 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 sprayed by the coal injection gun placed in the calciner outside the kiln. The temperature in the calciner is 870°C. The decomposed biomass continuously falls into the high-temperature molten pool at 1450-1500°C in the melting and firing furnace. The carbon with a particle size of 15mm added to the top of the melting and firing furnace contacts and burns with the air injected through the top lance at a flow rate of 150m / s to provide the energy required for cement f...

Embodiment 2

[0041]The calcite mine in Mianyang, Sichuan, and the dry loess ore and iron slag in Shifang are crushed by the jaw crusher into 10-30mm granular materials and sent to 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 885°C, and the decomposed biomass continuously falls into the high-temperature melting pool at 1390-1440°C in the melting and firing furnace. Carbon with a particle size of 25 mm is added from the top of the melting and firing furnace, and the energy required for cement firing is provided by contacting and burning air with a flow rate of 340 m / s injected through the top lance...

Embodiment 3

[0046] Dolomite ore (chalk), dry shale ore and sulfuric acid slag from Jiangyou, Sichuan, where they are produced, are crushed by a jaw crusher into 10-30mm granular materials and transported into 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 continuously falls into the high-temperature molten pool at 1600-1643°C in the melting and firing furnace. Carbon with a particle size of 50mm is added from the top of the melting and firing furnace, and the energy required for cement firing is provided by contacting and burn...

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Abstract

The invention relates to a novel method for producing cement, 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 of the invention is characterized in that after being pre-heated and pre-decomposed, a cement raw material is placed into a high temperature molten pool to generate a fused mass, a cement melting and sintering reaction is carried out to obtain a high temperature fused clinker, the high temperature fused clinker is consecutively cooled, proportioned and grinded to obtain the finished product cement; the high temperature molten pool is a reaction tank which decomposes the cement raw material and then heats and fuses for further to sinter to obtain the over-flowed state clinker; the sintering reaction temperature range is 1350 DEG C-1650 DEG C; the required energy of the cement melting and sintering reaction is provided by the combustion of fuel added from the top and combustion-supporting gas injected by a top spray gun. The method adopts the full molten liquid phase reaction, the mass and heat transfer rate is greatlyenhanced, the reaction time is short, and the transformation rate is high, thus the production capacity can be enhanced and a large amount of energy consumption is saved.

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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