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What are the adverse effects of sulfur, chlorine and alkali metals in solid waste on calcination?

Date:2019-11-05 14:38     writer:cement editor     Views:

In the use of solid waste calcination, because the solid waste contains a variety of metal components, so it will cause a variety of effects on the cement kiln, solid waste in sulfur, chlorine, alkali metal components have any adverse effects on the calcination?
 

1.corrosion of kiln body.


cement kiln
 

After decomposition of chlorine-rich solid waste in a cement dense and high-temperature environment, the chlorine-containing dust can contact with the metal structure of the kiln through cracks and destroy the structure of the kiln under a series of reactions.
 

These reactions occur mainly through two modes:


(1) direct reaction of metal or oxide with HCI or Cl2 in gas phase corrosion;

(2) thermal corrosion of metals or oxides with low-melting chlorides such as FeCl2, PbCl2, ZnCl2, and sulfate in deposited salts

 

2.crust of cement kiln pre-decomposition system.


cement kiln

 

Crusting is a kind of block with different hardness formed by raw powder used in cement production and harmful components in dense gas, which is attached to the inner wall of the pre-decomposition system.There are many reasons for the crust blockage of the kiln body in the process of cement capacity cooperative disposal. However, the crust blockage caused by sulfur, chlorine, alkali metals and other volatile substances in the solid waste in the cement kiln is a difficult problem in the industry.It is generally believed that crust material consists of alkali, chlorine, sulfur and other elements under the condition of high temperature formed Ca10 (SiO4) 3 (SO4) 3 cl2 multicomponent low melting, such as their dust mixed with the preheater precalcining system together, through the wet liquid film under the action of surface tension of molten adhesive, surface bonding on the surface of the melt and fibrous or mesh material mixed effect caused by the bond formed by a large number of patches, hardness mixed crust material.

The harm of skinning is mainly reflected in the different positions of skinning materials with different hardness formed in the pre-decomposition system of the solid waste cooperative disposal kiln, which leads to the blockage of the kiln body to different degrees, which affects the normal production and the quality of cement products.In normal working conditions, the smoke chamber pressure generally fluctuates between -20pa and -30pa, and when the crust is serious, the pressure drops to -100pa.At this time, the ventilation resistance in the kiln increases, and there is fire passing phenomenon, which can't be operated by the pyrotechnics, resulting in short flame burning of clinker and too much yellow core material.Heavy cement kiln process and cement raw materials do not match, resulting in close.

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