Method for calcining cement clinker by using high-sulfur coal as fuel

A technology for cement clinker and high-sulfur coal is applied in the field of calcined cement clinker to achieve the effects of reducing process accidents and alleviating skin blockage

Pending Publication Date: 2022-07-29
贵州德隆水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Slow down the condensation of high-sulfur coal in the low-temperature area of ​​the kiln tail and smoke chamber during the calcination of high-sulfur coal. The...

Method used

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  • Method for calcining cement clinker by using high-sulfur coal as fuel

Examples

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Embodiment 1

[0029] A method for calcining cement clinker with high-sulfur coal as fuel, adding discarded fluorite ore mining waste slag and lead-zinc slag as raw materials during raw meal preparation, and the specific production steps include:

[0030] Select fluorite ore mining waste slag as siliceous material for crushing, and select lead-zinc slag for crushing and standby;

[0031] In terms of mass percentage, 75% of limestone, 3% of siliceous material fluorite ore mining waste slag, 10% of aluminum material, and 1% of lead-zinc slag are mixed and ground to obtain raw meal for use; the CaO content of the fluorite ore mining waste slag exceeds 30% calcareous material as cement ingredient; the fluorite mine mining waste slag SiO 2 Content up to 90%, CaF 2content of 3%; the aluminum material is shale; the raw meal composition should meet the requirements of the design three rate values ​​of calcined cement clinker, namely, KH=1.020±0.02, n=2.6±0.1, p=1.5 ±0.1; CaF in the raw meal 2 The...

Embodiment 2

[0034] A method for calcining cement clinker with high-sulfur coal as fuel, adding discarded fluorite ore mining waste slag and lead-zinc slag as raw materials during raw meal preparation, and the specific production steps include:

[0035] Select fluorite ore mining waste slag as siliceous material for crushing, and select lead-zinc slag for crushing and standby;

[0036] In terms of mass percentage, 85% of limestone, 7% of siliceous material fluorite ore mining waste slag, 15% of aluminum material, and 4% of lead-zinc slag are mixed and ground to obtain raw meal for use; the CaO content of the fluorite ore mining waste slag exceeds 30% calcareous material as cement ingredient; the fluorite mine mining waste slag SiO 2 Content up to 90%, CaF 2 content of 3%; the aluminum material is clay; the raw meal composition should meet the requirements of the design three-rate value of calcined cement clinker, that is, KH=1.020±0.02, n=2.6±0.1, p=1.5± 0.1; CaF in the raw meal 2 The c...

Embodiment 3

[0039] A method for calcining cement clinker with high-sulfur coal as fuel, adding discarded fluorite ore mining waste slag and lead-zinc slag as raw materials during raw meal preparation, and the specific production steps include:

[0040] Select fluorite ore mining waste slag as siliceous material for crushing, and select lead-zinc slag for crushing and standby;

[0041] In terms of mass percentage, 85% of limestone, 3% of siliceous material fluorite ore mining waste slag, 15% of aluminum material, and 1% of lead-zinc slag are mixed and ground to obtain raw meal for use; the CaO content of the fluorite ore mining waste slag exceeds 30% calcareous material as cement ingredient; the fluorite mine mining waste slag SiO 2 Content up to 90%, CaF 2 content of 3%; the aluminum material is one or more of shale and clay; the raw meal composition should meet the requirements of the design third rate value of calcined cement clinker, that is, KH=1.020±0.02, n=2.6±0.1, p=1.5±0.1; CaF ...

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Abstract

The invention relates to the technical field of cement production, in particular to a method for calcining cement clinker by using high-sulfur coal as fuel, by controlling the content of CaF2, ZnO and PbO in fluorite mine mining waste residues and lead-zinc residues and combining the use of raw materials, sulfur in the coal is fixed in the clinker in a calcium sulphoaluminate mineral form to reduce the circulating enrichment of sulfur and relieve the skinning and blockage of a kiln tail system, so that the production efficiency of the cement clinker is improved. The problem that high-sulfur coal (the total sulfur content is about 6%) cannot be used as a main fuel in cement clinker calcination at present is solved, and continuous and normal operation of the kiln system when the high-sulfur coal is used for calcining the clinker is effectively guaranteed. Meanwhile, clinker heat consumption is reduced; the cost pressure caused by purchasing a large number of commercially available sulfur-fixing agents is avoided, the clinker strength can be improved, and the clinker performance is improved.

Description

technical field [0001] The invention relates to the technical field of cement production, in particular to a method for calcining cement clinker with high-sulfur coal as fuel. Background technique [0002] In the new dry process cement kiln system, the harmful elements K, Na, Cl, S, etc. in the raw materials are volatilized in the kiln gas in various forms at 800 °C, and in various forms at 1300 °C The S (sulfide, sulfate, organic sulfur, etc.) of the kiln will also volatilize in the kiln gas, and form K in the kiln tail, smoke chamber and low-level section of the calciner's constriction. 2 SO 4 , Na 2 SO 4 , CaSO 4 , KCl, NaCl, Glauber's salt, ettringite and other substances agglomerate in the raw meal, and then return to the kiln for calcination and volatilize at high temperature with the raw meal, so that the cycle is enriched. During the kiln calcination process, when K, Na, Cl, S, etc. in the high-temperature kiln gas are condensed in the low-temperature area of ​​...

Claims

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Application Information

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IPC IPC(8): C04B7/44C04B7/24C04B7/147
CPCC04B7/4407C04B7/24C04B7/147
Inventor 余三平
Owner 贵州德隆水泥有限公司
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