Soil conditioning agglomerates containing calcium

a technology of soil conditioning agglomerates and calcium, which is applied in the direction of calcium fertilisers, nitrogenous fertilisers, applications, etc., can solve the problems of difficult bulk-blending with other materials, easy to carry dust, and limited agricultural utilization of waste products, so as to achieve sufficient mechanical strength and improve efficacy

Inactive Publication Date: 2005-11-03
MAGIC GREEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] Among the objects of the present invention, therefore, are the provision of a process for forming an agglomerate comprising calcium-containing waste materials such as cement kiln dust for use as a soil conditioning agent; the provision of such a process capable of producing an agglomerate having sufficient mechanical strength to withstand the rigors of handling, transport and application without excessive dusting; the provision of such a process which produces an agglomerate which disintegrates readily into particles having substantially the same size as the raw materials used to form the agglomerate once the agglomerate is incorporated into soil and exposed to water so that the various beneficial components of the agglomerate may be rapidly utilized by plants grown in the soil; and the provision of soil conditioning agents and agglomerate compositions made from calcium-containing waste materials as well as from conventional agricultural liming materials combined with plant nutrient values exhibiting improved efficacy.
[0009] The present invention is also directed to a method for introducing nutrient values into cultivated soil so as to inhibit leaching of the nutrient values from the soil and improve utilization of the nutrient values by plants grown in the soil. The method comprises applying to the soil an agglomerate comprising about 15% to about 60% by weight of a particulate calcium source, about 30% to about 80% by weight of a primary plant nutrient source and a water-soluble binder. The particulate calcium source exhibits a calcium carbonate equivalent value in excess of about 85% and has a particle size distribution such that at least about 90% by weight of the particulate calcium source is −250 mesh Tyler Standard Sieve Series. The agglomerate readily dissolves upon exposure to water to disintegrate into particles of the particulate calcium source and primary plant nutrient source.

Problems solved by technology

However, expanded agricultural utilization of these waste products has been hindered by problems associated with storage, handling and application of these finely divided materials to soils.
As a result, the dust is easily carried away by the wind and is difficult to bulk-blend with other materials in preparing various fertilizer formulations.
Consequently, numerous problems are encountered when such equipment is employed for field application of finely-divided dust.

Method used

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  • Soil conditioning agglomerates containing calcium

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0058] In this example, agglomerates were made from preagglomerate mixtures containing varying amounts of CaO combined with CaCO3, urea and / or potash fines along with an aqueous solution of NORLIG A brand calcium lignosulfonate (about 54 weight percent lignosulfonate salt) as a binder. The preagglomerates were formed by thoroughly mixing CaO with measured quantities of CaCO3, urea and / or potash fines. The CaO, CaCO3, urea and potash fines each exhibited a particle size of −100 mesh. Once formed, the preagglomerate was then hand fed to a shallow pan disc pelletizer and formed into agglomerates. In some trials, the aqueous solution of lignosulfonate binder was mixed with the other components of the preagglomerate before being introduced onto the pan, while in other trials the binder was added to the other materials after they were introduced onto the pan. It is preferred that the binder be thoroughly incorporated into the preagglomerate mixture prior to being introduced into the pan. ...

example 2

[0059] Three samples of cement kiln dust taken directly from the dust collection apparatus of a portland cement plant (Plant A) were hydrated using varying amounts of water. The three samples were combined in a high energy mixer with 10, 14 and 16 weight percent water, respectively and stored in sealed containers for approximately 24 hours. Each sample of hydrated material was then mixed with 7 weight percent potash, 5 weight percent of an aqueous solution of NORLIG A brand calcium lignosulfonate (about 54 weight percent lignosulfonate salt) and additional water in a high energy mixer to form a preagglomerate. The preagglomerate was then fed to a FERRO-TECH brand shallow pan disc pelletizer and formed into agglomerates. During pelletizing, approximately 5 weight percent of additional water was added to the forming agglomerates. The agglomerates had a size ranging from approximately −6 to +16 mesh. These agglomerates were then oven dried at 120° C. for approximately 24 hours. The dri...

example 3

[0060] Four samples of cement kiln dust were taken directly from the dust collection apparatus of each of two other portland cement plants (Plants C and L) and hydrated using varying amounts of water. The four samples from each plant were combined in a high energy mixture with 4, 6, 8 and 10 weight percent water, respectively, and stored in sealed containers for approximately 24 hours. Each of the samples of hydrated material was then mixed with 8 weight percent of an aqueous solution of NORLIG A brand calcium lignosulfonate (about 54 weight percent lignosulfonate salt) and additional water in a high energy mixer to produce a preagglomerate. The preagglomerate was then fed to a FERRO-TECH brand shallow pan disc pelletizer and formed into agglomerates. During pelletizing, approximately 2.5 to 5 weight percent of additional water was added to the forming agglomerates. The agglomerates had a size ranging from approximately −6 to +16 mesh. These agglomerates were then oven dried at 120°...

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Abstract

Mechanically strong, water-disintegrable agglomerates made from a particulate calcium source, a water-soluble binder and optionally containing a primary plant nutrient source and / or micronutrient source and a process for forming such agglomerates are disclosed. The agglomerates may be used as a soil liming agent and for introducing nutrient values into cultivated soil. Also disclosed is a method for introducing nutrient values into cultivated soil so as to inhibit leaching of the nutrient values from the soil and improve utilization of the nutrient values by plants grown in the soil.

Description

[0001] This application claims the benefit of U.S. provisional application Ser. No. 60 / 083,232, filed Apr. 27, 1998, the disclosure of which is expressly incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] The present invention relates to mechanically strong, water-disintegrable agglomerates containing various particulate calcium sources for use as a soil conditioner to neutralize soil acidity and provide a source of nutrient values. The present invention also relates to processes for forming such agglomerates as well as to methods of introducing nutrient values into cultivated soil so as to inhibit leaching of the nutrient values and improve utilization of the nutrient values by plants grown in the soil. [0003] Soil conditioners or liming agents are widely used in agriculture, lawn care and gardening to reduce soil acidity and promote plant health. A variety of calcium-containing materials, in particulate or granulated form, are used as soil liming agents. Conventio...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C05C9/00C05D3/00C05D3/02C05F11/00C05G1/00C05G5/12
CPCC05D3/00C05D3/02C05F11/00C05G1/00C05G3/0058Y10S71/903C05D3/04C05G3/0047C05G5/12C05G5/40
Inventor WOMMACK, GREGSTEPHEN, ROY M.
Owner MAGIC GREEN CORP
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