Waste-free processing extraction meal from sunflower seed, comprises separating the meal into first fraction with high raw protein- and low raw fiber content and second fraction with low raw protein- and high raw fiber content by sieving

摘要

The method comprises separating an extraction meal into a first fraction with high raw protein content and low raw fiber content and a second fraction with low raw protein content and high raw fiber content by uniquely sieving and then uniquely air sifting. The extraction meal is initially subjected to two-step coarse sieving, in which the coarse particles of the extraction meal that do not undergo the coarse sieving are directly slammed to the second fraction and in which the fine particles of the extraction meal that undergo the coarse sieving are subjected to a multi-step fine sieving. The method comprises separating an extraction meal into a first fraction with high raw protein content and low raw fiber content and a second fraction with low raw protein content and high raw fiber content by uniquely sieving and then uniquely air sifting. The extraction meal is initially subjected to two-step coarse sieving, in which the coarse particles of the extraction meal that do not undergo the coarse sieving are directly slammed to the second fraction and in which the fine particles of the extraction meal that undergo the coarse sieving are subjected to a multi-step fine sieving according to the grain sizes. In the multi-step fine sieving, the particles are separated into grain size fractions and subsequently each of the grain size fractions is separately subjected to air sifting, in which the grain size fraction is separated into specific light- and specific heavy particles and then the specific light particles of all grain size fractions are slammed to the second fraction and the specific heavy particles are slammed to the first fraction. Before the coarse sieving, a multi-step pre-sieving of the extraction meal is carried out, in which the coarse particles of extraction meal that do not undergo the pre-sieving are subjected to a mechanical crushing and then led to the pre-sieving and in which the fine particles that do not undergo the pre-sieving are led to the fine-sieving. The particles of the extraction meal undergoing the coarse sieving and/or pre-sieving are milled before fine-sieving. The fine-sieving is carried out in four-step with successive sieve widths of the sieve steps of 1300 mu m, 800 mu m, 500 mu m and 300 mu m. The coarse-sieving is carried out with two successive sieve widths of the sieve steps of 2500 mu m and 1750 mu m. The pre-sieving is carried out with two successive sieve widths of the sieve steps of 3000 mu m and 1750 mu m. The first and second fractions are continuously discharged over separate belt weighers. The extraction meal passes through a magnet separator for separating metallic impurities before the coarse sieving and/or pre-sieving, and passes through a lump breaker (30) for dissolving lumps before the coarse sieving and/or pre-sieving. The first and/or second fractions are processed to pellets. An independent claim is included for a system for waste-free processing of extraction meal from sunflower seeds.