Soil conditioning agglomerates containing cement kiln dust
AssigneeMagic Green Corporation
InventorsGreg Wommack, Carl Holley, Eugene Greskovich
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Abstract
Mechanically strong, water-disintegrable agglomerates for use as a soil conditioner produced from dust particles emitted from kilns during the manufacture of cement and a process for forming such agglomerates are disclosed. The process comprises combining cement kiln dust and a water-soluble binder to produce agglomerates which are then subjected to controlled drying such that the dried agglomerates having a size ranging from -7 to +8 Tyler Standard Sieve Series exhibit an average green crush strength of at least about 2 pounds (about 0.9 kg).
Claims32
A process for forming an agglomerate containing cement kiln dust for use as a soil conditioning agent to neutralize soil acidity and provide a source of nutrient values, the process comprising:
- preparing a preagglomerate containing a water-soluble binder and a particulate calcium source comprising cement kiln dust, the combined concentration of CaO and other calcium-containing compounds having the potential to be hydrated in the preagglomerate being no greater than about 10% by weight;
- pelletizing the preagglomerate to form the agglomerate, the proportion of the particulate calcium source in the preagglomerate being sufficient such that the agglomerate contains at least about 15% by weight of the particulate calcium source;
- and
- drying the agglomerate, the drying being controlled such that dried agglomerates having a size ranging from -7 to +8 Tyler Standard Sieve Series exhibit an average green crush strength of at least about 2 pounds.
An agglomerate for use as a soil conditioner to neutralize soil acidity and provide a source of nutrient values, the agglomerate being formed by pelletizing a preagglomerate containing a water-soluble binder and a particulate calcium source comprising cement kiln dust combined with at least one other calcium-containing secondary plant nutrient source selected from the group consisting of hydrated lime, limestone, dolomitic limestone, gypsum, quicklime and mixtures thereof, the particulate calcium source having a particle size distribution such that less than about 1% by weight of the particulate calcium source is +20 mesh and less than about 10% by weight of the particulate calcium source is -20 +100 mesh Tyler Standard Sieve Series, the combined concentration of CaO and other calcium-containing compounds having the potential to be hydrated in the preagglomerate being no greater than about 10% by weight.
An agglomerate for use as a soil conditioner to neutralize soil acidity and provide a source of nutrient values, the agglomerate being formed by pelletizing a preagglomerate containing a water-soluble binder, a primary plant nutrient source providing a source of available nitrogen and a particulate calcium source comprising cement kiln dust, the proportions of the primary plant nutrient source and the particulate calcium source in the preagglomerate being sufficient such that the agglomerate comprises about 15% to about 60% by weight of the particulate calcium source and about 40% to about 80% by weight of the primary plant nutrient source, the combined concentration of CaO and other calcium-containing compounds having the potential to be hydrated in the preagglomerate being no greater than about 10% by weight, the agglomerate having a size ranging from -7 to +8 Tyler Standard Sieve Series exhibiting an average green crush strength of at least about 2 pounds.
An agglomerate for use as a soil conditioner to neutralize soil acidity and provide a source of nutrient values, the agglomerate being formed by pelletizing a preagglomerate containing a water-soluble binder, a primary plant nutrient source providing a source of potassium and a particulate calcium source comprising cement kiln dust, the proportions of the primary plant nutrient source and the particulate calcium source in the preagglomerate being sufficient such that the agglomerate comprises about 15% to about 60% by weight of the particulate calcium source and about 30% to about 80% by weight of the primary plant nutrient source, the combined concentration of CaO and other calcium-containing compounds having the potential to be hydrated in the preagglomerate being no greater than about 10% by weight, the agglomerate having a size ranging from -7 to +8 Tyler Standard Sieve Series exhibiting an average green crush strength of at least about 2 pounds.
A process for forming an agglomerate containing cement kiln dust for use as a soil conditioning agent to neutralize soil acidity and provide a source of nutrient values, the process comprising:
- preparing a preagglomerate containing a water-soluble binder and a particulate calcium source comprising cement kiln dust combined with at least one other calcium-containing secondary plant nutrient source selected from the group consisting of hydrated lime, limestone, dolomitic limestone, gypsum, quicklime and mixtures thereof, the particulate calcium source having a particle size distribution such that less than about 1% by weight of the particulate calcium source is +20 mesh and less than about 10% by weight of the particulate calcium source is -20 +100 mesh Tyler Standard Sieve Series, the combined concentration of CaO and other calcium-containing compounds having the potential to be hydrated in the preagglomerate being no greater than about 10% by weight;
- pelletizing the preagglomerate to form the agglomerate;
- and
- drying the agglomerate, the drying being controlled such that dried agglomerates having a size ranging from -7 to +8 Tyler Standard Sieve Series exhibit an average green crush strength of at least about 2 pounds.
Dependencies are inferred from the claim text.