Process for making granular L-lysine feed supplement

摘要

Provided are a method for preparing a granular animal feed additive and the granular animal feed additive prepared by the method. The method includes: filtering, with a membrane filter, a fermentation broth obtained from a lysine producing microorganism cultured in a lysine producing condition to obtain a lysine-containing filtrate and a microorganism-containing sludge; drying the filtrate to obtain a concentrate with a total solid content of 48 to 52 wt %; granule-drying the concentrate at a temperature of 50° C. to 60° C. to obtain granules; and coating the granules with a coating agent containing one or more selected from the group consisting of the sludge, a diluent or a free lysine as a lysine content adjustor, and a moisture prevention agent, to obtain lysine granules having the following properties: Lysine content (lysine sulfate) 65% or more Grain size 300-1,200 mum, 90% or more Apparent density 620-720 kg/m3 Protein content 10-15% Total sugar content >0-1% Inorganic material content >0-3% Water content >0-3% Carboxylic acid content >0-8% SO4- ion content 20-25%.