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A kind of cement clinker processing technology and cement clinker

A processing technology and cement clinker technology, which is applied in the cement clinker processing technology and cement clinker field, can solve problems such as clinker strength reduction, rotary kiln sintering temperature rise, and clinker quality impact, so as to improve sintering quality, Effect of shortening sintering time and reducing production cost

Active Publication Date: 2021-09-07
HEBEI DINGXING CEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ignition point of pulverized coal is generally 500-700°C. If the thermal system in the rotary kiln is unbalanced, it is easy to delay the starting point of combustion of pulverized coal, and the temperature range when the pulverized coal reaches the maximum burning speed is too high, resulting in the failure of the rotary kiln. The increase of internal sintering temperature; some traditional kiln temperatures are as high as 1400-1500°C, and the sintering time is as long as 1h or more, the calcination efficiency is low, and the energy consumption is large
Due to the shortage of high-quality coal resources in my country and the high price, the fineness of pulverized coal in actual production is difficult to meet the standard (within 8%-15%); and the fineness of pulverized coal does not meet the standard, which will lead to insufficient combustion of pulverized coal, making the The burned ash settles on the surface of the clinker particles in the firing zone, resulting in silicification on the surface of the clinker particles, thereby changing the mineral composition of the clinker surface layer and making C 3 The content of S (tricalcium silicate) decreased, C 2 The content of S increased; however, C 3 The content of S is linearly positively correlated with the strength of clinker, so C 3 The decrease of S content will directly lead to the reduction of the strength of the clinker and affect the quality of the clinker

Method used

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  • A kind of cement clinker processing technology and cement clinker
  • A kind of cement clinker processing technology and cement clinker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A processing technology for cement clinker, which comprises the following steps:

[0035] (1) Preparation and pretreatment of raw meal: crush limestone and sandstone in respective crushers, weigh 1000kg of crushed limestone, 50kg of crushed sandstone, add 50kg of copper slag, 20kg of dry fly ash and 40kg of wet fly ash, and grind it in a roller press to a 140-mesh sieve with 15% remaining, and then send it into the homogenization warehouse for homogenization to obtain raw meal; use a pneumatic automatic sampler to take the material at the outlet of the homogenization warehouse, Measure the three rate values ​​of raw meal KH: 1.0, N: 2.5; P: 1.5, which meet the requirements; among them, the moisture content of wet fly ash is 10%;

[0036] Preparation and feeding of mixed fuel: Put the raw coal into the coal homogenization bin for homogenization treatment, send it into the coal mill to grind until the fineness is 80μm square hole sieve and sieve the remaining 14% coal pow...

Embodiment 2

[0039] A processing technology for cement clinker, which comprises the following steps:

[0040](1) Preparation and pretreatment of raw meal: crush limestone and sandstone in respective crushers, weigh 1000kg of crushed limestone, 50kg of crushed sandstone, add 50kg of copper slag, 20kg of dry fly ash and 40kg of wet fly ash, and grind it in a roller press to a 140-mesh sieve with 15% remaining, and then send it into the homogenization warehouse for homogenization to obtain raw meal; use a pneumatic automatic sampler to take the material at the outlet of the homogenization warehouse, Measure the three rate values ​​of raw meal: KH: 1.0, N: 2.4; P: 1.5, which meet the requirements; among them, the moisture content of wet fly ash is 11%;

[0041] Preparation and feeding of mixed fuel: Put the raw coal into the coal homogenization bin for homogenization treatment, send it into the coal mill to grind until the fineness is 80μm square hole sieve and sieve the remaining 14% coal pow...

Embodiment 3

[0044] A processing technology for cement clinker, which comprises the following steps:

[0045] (1) Preparation and pretreatment of raw meal: crush limestone and sandstone in respective crushers, weigh 1000kg of crushed limestone, 50kg of crushed sandstone, add 50kg of copper slag, 20kg of dry fly ash and 40kg of wet Fly ash is ground in a roller press to a 140-mesh sieve with 14% remaining, and then sent to the homogenization storehouse for homogenization to obtain raw meal; the material at the outlet of the homogenization storehouse is collected with a pneumatic automatic sampler, Measure the three rate values ​​of raw meal: KH: 1.0, N: 2.5; P: 1.4, which meet the requirements; among them, the moisture content of wet fly ash is 12%;

[0046] Preparation and feeding of mixed fuel: Put the raw coal into the coal homogenization bin for homogenization treatment, send it into the coal mill to grind until the fineness is 80μm square hole sieve and sieve the remaining 14% coal pow...

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Abstract

The present invention relates to the technical field of cement clinker processing, in particular to a cement clinker processing technology, which includes the following steps: (1) Pretreatment of raw meal: preparation of raw meal, homogenization of raw meal, preheating of raw meal and Pre-decomposition; (2) Clinker firing: feed mixed fuel into the rotary kiln, and control the temperature in the kiln at 1100-1300°C; send the raw meal pre-decomposed in step (1) into the rotary kiln, and sinter for 10 ‑20min, the clinker is produced after being cooled by the grate cooler; the mixed fuel includes bamboo chips, wood chips and coal powder with a weight ratio of (0.2‑0.5): (1‑1.5): (2‑5); The inventive processing technology can reduce the sintering temperature of the clinker, shorten the sintering time, relatively reduce the amount of pulverized coal, and reduce energy consumption; And the compressive strength of 28d can reach up to 63.7MPa.

Description

technical field [0001] The invention relates to the technical field of cement clinker processing, in particular to a cement clinker processing technology and cement clinker. Background technique [0002] Cement clinker is a semi-finished product obtained by burning limestone, clay and iron raw materials as main raw materials in an appropriate proportion, burning them until they are partially or completely melted, and cooling them. They are used in the production and processing of cement. At present, the sintering of raw meal into clinker is mostly completed in the rotary kiln: by passing circulating hot air, raw meal and fuel into the rotary kiln, the raw meal is sintered into clinker at a sintering temperature above 1000°C. [0003] At present, separate pulverized coal is mostly used as the fuel to provide heat to the rotary kiln, and about 140kg of pulverized coal is needed to produce 1 ton of clinker, which consumes a lot of energy. The ignition point of pulverized coal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/26C04B7/44
CPCC04B7/26C04B7/44C04B7/4407Y02P40/10
Inventor 胡世国刘超张改良樊胜奇
Owner HEBEI DINGXING CEMENT CO LTD