3/14/2023 0 Comments Yara sulphuric scid![]() Based on the test work, Yara commissioned Outotec to build a demonstration plant with a 14-meter thickener. The work included initial test work and sizing for two 35-meter high compression thickeners. In 2010, Outotec worked with Yara for a thickened tailings project at the Siilinjärvi site. This creates problems in mixing tanks, thickeners, pumps and pipelines, and causes blockages if the material segregates and consolidates. The material settles and consolidates rapidly to form a highly structured material at a high density and yield stress. The material is coarse, but also contains a high proportion of mica and a fine fraction, which is difficult to aggregate with the coarse particles using flocculation. The challenge was the unique properties of the tailings material. At the time, the technology to process tailings and achieve a two-degree or more beach angle at the tailings discharge was not yet available. Thickening of the Yara Siilinjärvi tailings was first studied in the 1980s. Not wanting to go the route of creating a new tailings pond and expanding the footprint of the facility, Teija decided to turn to a trusted partner. Teija Kankaanpää, Head of Siilinjärvi Mine had three options: build a new tailings storage facility, raise the dams, or invest in new technology that would allow the use of the old tailings storage facility for years to come. In 2015, Yara´s tailings area was filling up and was close to its end of life capacity. ![]() Annually the mine produces about one million tonnes of apatite concentrate, and about ten million tons of tailings. The mine together with the phosphoric acid plant supplies the phosphorus raw material to the NPK fertilizer plants and feed phosphate plant in Finland. Yara Siilinjärvi site in the Eastern Province of Finland consists of a phosphate mine, two sulphuric acid plants, one phosphoric acid plant, one nitric acid plant and one NPK-fertilizer plant. Its largest business area is the production of nitrogen fertilizer. Yara International ASA is a Norwegian fertilizer company.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |