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.

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     minimized      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 1t/h to 50t/h.