Method for preparing calcium magnesium phosphate fertilizer by using phosphorite floatation tailing as raw material

Abstract

The invention relates to a method for preparing calcium magnesium phosphate fertilizer through cyclone furnace process by using phosphorite floatation tailings as raw materials, in particular to a method for preparing calcium magnesium phosphate fertilizer through adopting a cyclone furnace by using phosphorite floatation tailings as main raw materials, belonging to the technical field of phosphate fertilizer chemical industry. The method uses the phosphorite floatation tailings as the main raw materials and adopts the cyclone furnace to prepare calcium magnesium phosphate fertilizer, and comprises the following steps: (1) the phosphorite floatation tailings are used as the raw materials, pulp dry basis contains 8-12 percent of P2O5 by weight percent, tailing filter cakes are obtained through treatment and the tailing filter cakes contain 20-40 percent of water; (2) the tailing filter cakes obtained through the step (1) are dried to tailing power containing water less than 2 percent by using a dryer, and the required grain size of tailing powder is that more than 80 percent of particles can pass through a 100-mesh sieve; (3) other primary phosphorite, coal, serpentine stone and silica to be jointly calcined are metered, mixed, cracked and crushed into joint-calcination mixed powder with fineness that more than 80 percent of particles can pass through the 100-mesh sieve; (4) 100 parts of phosphorite raw material, 190-280 parts of pulverized coal, 0-10 parts of silica and 0-20 parts of serpentine stone powder are added in the cyclone furnace by weight; and (5) the calcined powder raw material obtained through the step (4) is used to prepare calcium magnesium phosphate fertilizer by adopting the cyclone furnace. The invention has the advantages that the source of the raw materials is wide and the cost is low; sulfuric acid and phosphoric acid are not consumed, the product quality is reliable, the use is economic and feasible, and the social benefit is remarkable.

Description

technical field [0001] The invention belongs to the technical field of phosphate fertilizer chemical industry, and particularly relates to a method for preparing calcium-magnesium phosphate fertilizer by using phosphate ore flotation tailings as main raw materials and using a cyclone furnace. Background technique [0002] In recent years, the rapid development of high-concentration phosphorus and compound fertilizer industries at home and abroad has caused a sharp decline in the reserves of phosphorus-rich ores that can be directly used for wet-process phosphoric acid processing, and the resources of phosphorus-rich ores in many areas are almost exhausted. In order to ensure the sustainable development of the high-concentration phosphorus compound fertilizer industry, many countries are using medium and low-grade phosphate rock or high-magnesium phosphate rock as raw materials to produce phosphate concentrate suitable for wet-process phosphoric acid processing. In the proces...

AI Technical Summary

Problems solved by technology

The stockpiling of a large amount of floating phosphorus tailings not only occupies a large amount of land resources, but also brings pollution to the environment and poses a huge safety hazard

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