Thermal mud phosphorus type phosphate rock powder binder

Abstract

A thermal-process phosphorous sludge type ground phosphate rock binder is characterized in that phosphorus-containing wastewater produced in a thermal-process yellow phosphorus production process is added to an acid sludge stirring tank, pasty acid sludge which contains 25%-30% of free phosphoric acid and 30%-35% of P2O5 and is produced through filtration during thermal-process phosphoric acid preparation from phosphorous sludge is slowly added, uniformly stirred and mixed, a suspension is formed, and the ground phosphate rock binder containing 70%-80% of solid matters and 28%-32% of P2O5 is prepared; the binder and ground phosphate rock after proportional stirring and mixing are subjected to ground phosphate rock press ball forming and drying or a pelleting and roasting process, and phosphorite pellets are produced. Intermediate products of a production process are sufficiently utilized as auxiliary materials and directly reused in the production process, the content of P2O5 in the phosphorite pellets is increased by 5%-8%, so that the Ca-Si ratio (namely, acidity coefficient Mk) of the ground phosphate rock is not increased, and the ground phosphate rock binder is suitable for most ground phosphate rock; efficient recycling and comprehensive utilization of the phosphate rock resource are realized.

Description

technical field [0001] The invention relates to a phosphate rock powder binder. [0002] technical background [0003] Phosphate rock is mined, transported, and put into the furnace after crushing, drying, screening and other processing in the factory. The amount of lump ore is only about 50%. If the qualified lump ore is purchased to make phosphorus, it usually loses 15%. ~20%, the remaining phosphate rock powder screened by yellow phosphorus production enterprises is huge, and if it is not used, it will cause great waste of phosphorus resources and serious economic losses. The "Yellow Phosphorus Industry Access Conditions" implemented by the state clearly requires that the mineral powder utilization rate of yellow phosphorus enterprises must reach 100%. Some yellow phosphorus production enterprises try to use phosphate rock powder plus clay or water glass as a binder and then pelletize and dry in order to achieve the purpose of comprehensively utilizing valuable phosphate ...

AI Technical Summary

Problems solved by technology

CN 102381690 discloses a medicine made of rare earth elements, sodium chloride, calcium chloride, zinc chloride, sodium carbonate and potassium carbonate in proportion to montmorillonite powder, which is mixed, matured, dried and ball-milled into powder The phosphate rock powder oxygen-enriched binder produced has many defects such as the addition of many raw materials, the lengthy and cumbersome production process, and the difficulty in controlling the chemical composition of the finished product and waste after high-temperature reaction and additional follow-up treatment.

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