Process for producing pressed fertilizer granulates

US6379414B1 · kind B1 · utility

Assignee

• Kali und Salz GmbH · DE

Inventors

• Ulrich Kleine-Kleffmann · Bad Hersfeld, DE
• Ludger Waldmann · Telgte, DE
• Frank Wolf · Wooster, US

Key dates

• Filing date: Apr 27, 2000
• Grant date: Apr 30, 2002
• Expiry date: Apr 27, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C05D1/02
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process is for the production of potash fertilizer granulates which have a stable shelf life also at high relative air humidities. This granulate contains an additive in the form of magnesium oxide and/or calcium oxide in a fine powder form, which is added by metering in prior to the compacting step. The result is a high final bursting strength even if the granulate is stored in a wet climate.