Abstract
Production of compound mineral fertilizers as a method of utilization of waste products in chemical company Alwernia S.A. The results of investigations on a possible utilization of waste products formed during the production of commercial and food inorganic salts are presented. Application of wastes in the production of compound fertilizers was suggested. The work covered a full research cycle starting from laboratory tests and ending on the production implementation. Fertilizer formulas were developed on the basis of laboratory tests. A possible production of fertilizers of suggested compositions was tested on a pilot plant scale. The compound fertilizer production with the use of waste raw materials was implemented in Chemical Company Alwernia S.A. It reduced the amount of wastes directed to industrial waste site.
Highlights
Chemical Company ALWERNIA Co.Ltd. are an important producer of commercial and food phosphoric salts, magnesium sulfate, calcium and magnesium nitrates
The pulp formed by the dissolution of phosphate sludge in sulfuric acid is applied in the production of some fertilizers, magnesium slurry – Mg source – is added to the prepared mixture and fertilizer production process is carried out in a production line identical with the described one
During the production of commercial inorganic salts in Chemical Company ALWERNIA S.A. the by-products which are valuable from the fertilizer point of view are formed
Summary
Chemical Company ALWERNIA Co.Ltd. are an important producer of commercial and food phosphoric salts, magnesium sulfate, calcium and magnesium nitrates. The products are formed, just like in the case of the magnesium slurry, in the filtration stage of calcium and magnesium nitrates solutions which were formed in the reaction of nitric acid with hydrated lime or dead-burnt magnesite. The investigation stage covered studies on the possibility of a simultaneous utilization of the post-filtration sludge, formed in various processes, for fertilizer production. The production of fertilizers of such composition consists in the granulation of the pulp prepared by the decomposition of the post-filtration sludge with sulfuric acid. In test No. phosphate sludge was divided into two parts; one was fed to the system in the form of the phosphate-magnesium pulp and the other one with the stream of loose raw materials. Test No. was carried out without the stage of dissolution with an acid and pulp formation: raw materials were just mixed and granulated with the use of steam
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