Is cement kiln dust hazardous?

CKD (10 13 06) is generally non-hazardous but highly alkaline (pH 12+). Classification depends on heavy-metal and free-lime content. Bypass dust with elevated chloride and alkali may require analysis before a valorization route is confirmed.

Can CKD be recycled back into the kiln?

Partly. Low-alkali CKD is routinely returned to the raw meal. High-alkali and high-chloride bypass dust must be bled off and is valorized externally as a soil stabiliser, in blended cements, or as an agricultural liming agent.

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Valorize Cement Plant Residues Beyond the Kiln

Cement kiln dust, bypass dust, and spent refractories are recoverable materials for soil stabilisation, blended cements, and agricultural liming. SymbioFlows finds the right receiver for each stream.

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~50–200 kg

CKD generated per tonne clinker

src: ECRA

~7%

Global cement share of CO₂

src: GCCA 2022

~52%

EU alternative fuel substitution

src: Cembureau 2022

60–80%

CKD reuse rate (SCM / stabiliser)

src: industry avg

Key Waste Streams — EWC Codes & Buyers

EWC Code	Material	Description	Who Buys It
10 13 06	Cement Kiln & Bypass Dust (CKD)	Alkaline particulate dust from kiln and bypass — high free lime content.	Soil stabilisation, blended cement, agriculture
10 13 13	Solid Gas-Treatment Wastes	Filter and scrubber residues from kiln gas cleaning.	Stabilisation/solidification, cement raw meal
10 13 14	Waste Concrete & Concrete Sludge	Returned concrete and washout sludge from on-site batching.	Recycled aggregate producers, raw meal
10 13 11	Cement-based Composite Waste	Off-spec cementitious and composite material not otherwise specified.	Aggregate recyclers, fill contractors
16 11 04	Spent Kiln Refractories	Alumina and magnesia brick from kiln and preheater relining.	Refractory recyclers, slag conditioner