“All-in-one” process

Continuously operating Ploughshare® Mixer KM

L‌ödige Process Technology developed a process engineering solution for the production of monocalcium phosphate (MCP). The powder, which is an essential component of feed and phosphate fertilizers, can thus be produced economically in an “all-in-one” process. Monocalcium phosphate (MCP) is formed by the reaction of pure phosphoric acid and calcium carbonate. Powerful process technology is just as important to the production of high-quality MCP as the quality of the raw materials used. Lödige offers a solution that is specially designed for this application, based on a type KM Ploughshare® Mixer for continuous operation.


Lödige offers a solution for the production of MCP, based on a type KM Ploughshare® Mixer for continuous operation
© Lödige
Lödige offers a solution for the production of MCP, based on a type KM Ploughshare® Mixer for continuous operation
© Lödige
Ploughshare® Mixer with application-specific design

The Ploughshare® Mixer for continuous operation uses the mechanically generated fluid bed system that was introduced to mixing technology by Lödige: Ploughshare® shovels in their basic shape patented by Lödige in 1949 rotate close to the walls of a horizontal, cylindrical drum. The circumference speed and geometric shape of these plough-like mixing tools are designed so that they pick up the raw materials for the mixture completely and throw them into the free mixing compartment. During this process, the material is lifted off the drum wall against the centrifugal force. This generates a mechanical fluid bed, in which the entire product mixture is constantly gripped, resulting in extremely thorough mixing, even with high mixture throughput and short retention times. The mixing elements are shaped to ensure product transport. Additional choppers in the mixing drum break up agglomerated material and permit systematic granulation during the mixing process. The result is a continuous “all-in-one” process. This means all process phases of MCP production can be performed in a single machine. Other units and process steps are no longer necessary. Moreover, the mixer offers great stability and minimised cleaning intervals. A special wear protection shields mixing tools and shovel arms against the high mechanical and corrosive stress caused by contact with the mixture.


Production process

The MCP production process has three phases: mixing – reaction – granulation. In the first step, the two base materials, phosphoric acid and calcium carbonate, are mixed to form a highly homogeneous substance. In the second phase of the process, an exothermic reaction is produced under defined conditions, resulting in a conversion of the base materials into monocalcium phosphate. This is followed by granulation in phase 3. The granulate properties can be adapted specifically to the customer’s requirements. The final process step, granulation, offers a variety of advantages over ungranulated MCP: It improves the pourability of the substance and makes transport and storage easier. It allows the product to be packaged dust-free and permits perfect dosing. A variety of different machine sizes is available for throughput rates in a range from 1 t/h to 50 t/h.



Related articles:

Issue 10/2018 No material adherence

Continuous ploughshare mixer with lined mixing vessel

M?aterials with a tendency to harden during the mixing process cause rapid wear of the machines in use. For these applications, Lödige Process Technology has developed the continuous ploughshare...

Issue 04/2019 Gebrüder Lödige Maschinenbau GmbH

Gebrüder Lödige Maschinenbau GmbH

S?hort retention times, constant reproducibility, the highest degree of homogeneity of the final product and versatile application. These are the features that distinguish the continuous Ploughshare®...

Issue 09/2017

Ploughshare® Mixers for batch and continuous processes

L?ödige Ploughshare® Mixers operate on the hurling and whirling principle introduced by Lödige to the industrial mixing technology and technical literature. Fitted with mixing elements specifically...

Issue 03/2022 Process safely and sensibly

Secure immobilisation of byproducts from power plants in Ploughshare® Mixers

When fossil fuels are burned in power plants, this creates a variety of byproducts, which have been processed and put to further use for decades. Aside from FGD gypsum, these primarily include fly ash...


06.12.2012 / Small but Lödige

With the new Ploughshare® Type N 5 laboratory mixer Lödige has expanded its range of laboratory equipment for small mixing quantities: the drum has a volume of 5 litres. This model is thus ideally...