Rotary Kiln Lined with Refractory Materials

There are many ways to classify rotary kilns. According to the chemical composition, rotary kilns can be divided into alkaline refractory materials, acidic refractory materials and neutral refractory materials; according to the chemical composition, they can be divided into silicon, aluminum silicate, aluminum, magnesium, silicon carbide, aluminum carbon, etc.; according to the bonding method, rotary kilns can be divided into cement-bonded rotary kilns, chemical bonding, condensation bonding, etc.; according to the installation method, rotary kilns can be divided into prefabricated parts and castables mixed, castables, plastics, ramming materials, spray coatings, prefabricated parts and other rotary kilns.
The installation and construction of rotary kiln refractory materials adopts the mixed use of prefabricated parts and castables, that is, the prefabricated parts are welded with prefabricated blocks at the parallel position of the rotary kiln axis. Because there is a template, a row of castables is made, so that the kiln body is consistent, and the kiln body lining can be replaced conveniently, and the service life will be relatively long. The main function of refractory materials is to withstand high temperature, wear, corrosion and other effects.

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Description

(1) The furnace temperature of chemical rotary kilns is high. The operating temperature is 1100~1450℃, which is a furnace with a relatively high operating temperature. Under occasional working conditions, the furnace temperature may reach 1600℃ or higher.

(2) There are many corrosive components such as H2O, H2S, SO3, SO2 and S vapor in the furnace of chemical rotary kilns. H2S has a reducing property, which places strict restrictions on certain impurity components in the furnace lining materials.

(3) Chemical rotary kilns are acid gas combustion furnaces. There is no heat extraction surface inside the furnace. Any large fluctuation under combustion conditions means a thermal shock to the furnace lining. Therefore, the furnace lining is required to have good thermal vibration resistance.

(4) Chemical rotary kilns have strict requirements on wall temperature, which requires the furnace lining materials to have good thermal conductivity.

2: Selection of refractory materials for the lining of the chemical rotary kiln system

2.1 Corundum castable material

The lining material of the acid gas reactor of the chemical rotary kiln device is generally made of corundum castable lining. The reason is that the corundum castable lining not only has a high refractory temperature, but also has good wear resistance. However, due to its poor thermal vibration resistance, it may have problems such as peeling and falling off in a short period of time.

2.2 High alumina brick + corundum brick material

The lining material of the original acid gas combustion furnace of the chemical rotary kiln is high alumina brick + corundum brick material. Its brick joints are one of the weakest links. Due to the damage of the brick joints, the overall deformation and collapse of the masonry often occur. On the other hand, high alumina bricks and corundum bricks are difficult to process and manufacture, and it is difficult to fit some special-shaped parts, and the cost is also high.

Products Description

2.3 Steel fiber castable material

Steel fiber castable has good refractory properties and has achieved good results. However, in the case of acid gas combustion furnaces, this material is prone to problems such as agglomeration and deep cracks.

2.4 Combination of castables and prefabricated parts

The combination of castables and prefabricated parts for chemical rotary kiln is a very good solution with the following significant features: ① High temperature resistance (up to 1200-1800℃) and high strength. ② The furnace wall support is hanging type, not easy to deform or fall off. ③ The insulation layer is poured and the working layer is rammed. It can be made into any shape (especially in special shapes). It is easy to construct, and its combined structure is dense and solid, and there is no gap in the kiln wall. ④ When the lining is supported by anchors, the furnace wall can withstand peeling and protrusion, and maintenance is convenient. ⑤ The lining material has good anti-peeling properties and will not embed foreign objects. ⑥ The furnace baking time is short, and the construction is fast and economical.

Performance table

Refractory materials for chemical hazardous waste treatment (refractory materials for rotary kiln)

Brand/ltem	GAM-85 Corundum mullite composite brick		SGA-85 Cylon combined corundum composite brick		(GGA-80)Chrome corundum composite brick		(GGZ-80) Chrome zirconium corundum composite brick		MSL75 Corundum mullite wear resistant castable		GGAL80 Corundum wear resistant castable
Brand/ltem	Heavy part	Light part	Heavy part	Light part	Heavy part	Light part	Heavy part	Light part	MSL75 Corundum mullite wear resistant castable		GGAL80 Corundum wear resistant castable
Al₂O₃ %	≥84	≥60	≥85	≥60	≥80	≥60	≥80	≥60	≥75		≥75
Cr₂O₃ %			SI4N3+ALS-ION≥3%				≥3
ZrO₂ %							≥3
Fe₂O₃ %	≤0.35	≤1	≤0.35	≤1	≤0.35	≤1	≤0.35	≤1	≤1		≤1
g/cm³ Bulk Density	2.95	≤2	2.9	≤2	3.1	≤2	3.1	≤2	110℃*24h≥2.9		110℃*24h≥3
MPa Cold Crushing Strength	≥120	≥20	≥120	≥20	≥130	≥20	≥120	≥20	110℃*24h≥90	1300℃烧后≥80	110℃*24h≥100
T2℃Refractoriness Under Load	≥1700		≥1700		≥1700		≥1700
Thermal shock stability (DIN standard) (950℃, full water cooling) times	≥30		≥30		≥30		≥30
% Permanent Linear Change	1300℃*2h±0.2		1300℃*2h±0.2		1300℃*2h±0.2		1300℃*2h±0.2		1100℃*2h±0.3		1100℃*2h±0.3
Application	Front and rear ends of rotary kiln		Rotary kiln high temperature section		Rotary kiln high temperature section		Rotary kiln high temperature section		Rotary kiln front end and kiln head cover		Rotary kiln tail

Brand/ltem	MS70 Mullite	MSL70 Corundum mullite wear resistant castable		GGAL75 Chrome corundum wear resistant castable	Acid proof castable
Al₂O₃ %	≥70	≥70		≥75	≥25
Cr₂O₃ %				≥3	SIO2≥65
Fe₂O₃ %	≤1	≤1		≤1
g/cm³ Bulk Density	≥2.55	110℃*2h≥2.9		110℃*2h≥2.9	110℃*2h≥2.9
MPa Cold Crushing Strength	≥80	110℃*24h≥90	1300℃ after burning ≥80	110℃*2h≥100	110℃*2h≥25
T2℃Refractoriness Under Load	≥1550				Acid resistance ≥98
Thermal shock stability (DIN standard) (950℃, full water cooling) times	≥20
% Permanent Linear Change	1300℃*2h±0.3	1100℃*2h±0.2		1100℃*2h±0.2
Application	Middle of the secondary combustion chamber	Upper part of secondary combustion chamber, pipeline		Second combustion chamber lower part	Quenching tower

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