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New technique for producing cement by using carbide mud residue ingredient of shaft kiln

A technology of slag batching and new technology, which is applied in the new technology field of producing cement by using calcium carbide slag batching in shaft kilns. It is easy to meet environmental protection standards, save energy consumption for drying and grinding, and save limestone resources

Inactive Publication Date: 2007-09-26
尹小林
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since calcium carbide slag is a light waste residue with high moisture content, it is very difficult to dry it; Ca(OH) in calcium carbide slag 2 The decomposition temperature is about 580°C, which is lower than that of CaCO 3 The decomposition temperature is high, and the cyclone and the cone of the decomposition furnace are prone to clogging, which is not conducive to continuous and stable production, and the processing cost is relatively high.
[0008] According to relevant domestic and foreign literature, the most advanced cement clinker production process with carbide slag is a new dry production process. Although the heat consumption of clinker firing is low, the energy consumption of drying and grinding is high, which is not conducive to energy saving. Coupled with excessive investment, it is difficult to popularize and implement

Method used

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  • New technique for producing cement by using carbide mud residue ingredient of shaft kiln

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Embodiment

[0030] The vertical kiln trial production line of a factory in Zhuzhou used carbide slag discharged from the production of polyvinyl chloride of Zhuzhou Chemical Group to replace limestone. The calcium carbide slag has a moisture content of 35-38% and an average dry basis CaO content of 67.70%. Raw materials used in trial production are fly ash, silica sand, sulfuric acid mud, zinc slag, anthracite and carbide slag. The dry raw meal powder is made of fly ash, silica sand, sulfuric acid mud, zinc slag and anthracite, and is ground by a Φ1.83×7m raw meal mill with a classifier, with a fineness of 80um and a 9.8% sieve. The dry raw meal powder and calcium carbide slag are pre-mixed in the twin-shaft mixer after metering and batching, and then unloaded into the planetary wheel mill mixer for rolling and mixing. The bar material is sent to the vertical kiln by the belt, and the original material ball enters the kiln belt and is transported into the kiln for calcination.

[0031] I...

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Abstract

The invention discloses a shaft kiln new craft to produce cement through supplying carbide slag dosage, which comprises the following steps: using carbide slag to replace lime rock in the cement slurry and dosage completely or partly; making carbide slag after filter-pressing as raw material; mixing evenly with grinding slurry and dosage directly; producing raw material rod or raw material ball; entering into shaft kiln; calcining to clinker. This invention is an energy-saving and environmental new technology, which can save coal, water and lime rock source.

Description

Technical field: [0001] The invention relates to a new technology in the aspects of comprehensive utilization of resources, energy saving and environmental protection in the cement industry, and specifically relates to a new technology for producing cement in a vertical kiln using calcium carbide slag as ingredients, which can also be used in the transformation of a wet rotary kiln. Background technique: [0002] Carbide slag is the industrial waste of polyvinyl chloride resin produced by the acetylene method in the coal chemical industry. In the past, most enterprises chose to store calcium carbide slag or pave the roadbed or even discharge it directly into rivers, which is not conducive to environmental protection. [0003] my country began to use calcium carbide slag to produce cement clinker in the 1970s, mainly using the wet long kiln production process, and then appeared shaft kiln, Liboer kiln and five-stage cyclone preheater kiln production processes, but these produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/38C04B7/40C04B7/24C04B7/42
CPCC04B7/14Y02P40/10C04B7/4469
Inventor 尹小林
Owner 尹小林
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