In this review, the dominant techniques. for the beneficiation of phosphate ores are introduced. Moreover, the factors that affect the flotation. of phosphate ore, including the properties of ...

Defluorination of rock phosphate is an industrial process that is suitable only for large-scale production. Rock phosphate contains about 17% phosphorus and 34% calcium.

A few defluorination tests were made on raw San Francisco phosphate rock, with results that differed little from those on the beneficiated product. For example, 195 grams of minus-100-mesh …

Defluorination of phosphate rock . United States Patent 2499767 . Abstract: This invention relates to the defluorination of phosphatic materials by calcination, and has for its object the provision of certain improvements in that process. Fluorine is present in practically all native phosphate rocks, in amount varying in the different areas in ...

The meaning of DEFLUORINATE is to remove fluorine from. How to use defluorinate in a sentence.

This Phase II study covers phosphate chemicals produced by the defluorination of phosphate rock, the defluorination of phosphoric acid, and the sodium phosphates produced from wet process phosphoric acid.

Phosphoric acid and commercial fertilizers contain a significant quantity of fluoride, which comes from the phosphoric acid mineral, rock phosphate. HF and SiF4 …

This invention relates to the defluorination of phosphate rock by calcination in the presence of water vapor, and has for its object the provision of certain improvements in that process. Fluorine is present in practically all native phosphate rock, in amount varying in the different aeas...

A new process to produce defluorinated dicalcium phosphate (DCP) using phosphate rock concentrate has been developed. This new process has as main characteristic the …

US2839361A US462376A US46237654A US2839361A US 2839361 A US2839361 A US 2839361A US 462376 A US462376 A US 462376A US 46237654 A US46237654 A US 46237654A US 2839361 A US2839361 A US 2839361A Authority US United States Prior art keywords rock reagent mixture phosphate rock calcining charge Prior art date 1954 …

Defluorination of phosphate rock is carried out by introducing seed particles into a fluid bed reactor and a fluidizing gas to establish a fluidized bed therein; gradually introducing phosphate rock feed liner than about 35 mesh at a point below the top of the fluid bed; continue introducing the phosphate rock feed to establish a fluidized bed containing …

The process has essentially three main steps: phosphate rock digestion, defluorination and neutralization. In the first step a phosphate rock slurry is batch digested with concentrated sulfuric acid in the presence of some additives that retain the fluorine in the solution, as well as enable the adequate growth of the calcium sulfate …

Phosphates, compounds of the element phosphorus, are produced from relatively abundant supplies of phosphate rock. The major use of phosphate is to supply phosphorus, one of the three essential plant foods—nitrogen, phosphorus, and potassium. Phosphate rock extraction from its ore, and its subsequent conversion into fertilizer …

Numerous patents and references may be found that relate to studies of phosphate-rock defluorination processes. Most of these require sulfuric acid and heat,

Defluorination of rock phosphate by heat treatment is an important method of producing phosphates suitable for animal feed. A variety of such products have been evaluated as phosphorus sources for ruminants, e.g. Beeson et al. (1945) recorded that a material produced at a low temperature (600°C) was unsatisfactory for steers, but …

In a process for producing a defluorinated product containing calcium, sodium and phosphorus, by calcination of a mixture of phosphate rock, with caustic soda, phosphoric acid and water, an improvement comprises maintaining the amount of phosphoric acid in the mixture such that the ratio of phosphorus in percentage by weight on a dry basis in ...

Feedphos-18 Defluorinated Phosphate - (Henderson, NC) Is a Lift Gate required? Defluorination of rock phosphate by heat treatment is an important method of producing phosphates suitable for animal feed. A variety of such products have been evaluated as phosphorus sources for ruminants, e.g. Beeson et al.(1945) recorded that a material …

This invention relates to the defluorination of phosphate rock and similar natural phosphatic materials in a fluidized reactor in which there is no reaction between the rock and the defluorinating reagents prior to their addition to the fluidized reactor.

In addition, experiments were conducted to determine the effect of oxalate and ferric ion upon the absorption of calcium and phosphorus in the presence of meta- and ortho-phosphate.

Phosphoric acid and commercial fertilizers contain a significant quantity of fluoride, which comes from the phosphoric acid mineral, rock phosphate. HF and SiF4 vapours are two of the most significant emissions from the phosphoric acid industry. The main source of emissions is the reactor where H2SO4 combines with phosphate rock. …

Phosphate rock needs processing to reduce the content of gangue minerals such as silicates, carbonates, and clays to meet the requirements of the phosphate industry. Froth flotation method has been an important part of the concentration process since the 1920s and today, more than half of the world's marketable phosphate is …

The invention is a process for the manufacture of highly citrate soluble phosphatic materials containing at least 18% P and not more than 0.18% F and involves the thermal defluorination of phosphate rock analyzing between 68 and 74 BPL (BPL = % bone phosphate of lime or Ca 3 (PO 4) 2 equivalent to P 2 O 5 content of the rock). Such …

Fused Tricalcium Phosphate - Production by Deflourination of Rock Phosphate in a Shaft Furnace

US2531046A US665347A US66534746A US2531046A US 2531046 A US2531046 A US 2531046A US 665347 A US665347 A US 665347A US 66534746 A US66534746 A US 66534746A US 2531046 A US2531046 A US 2531046A Authority US United States Prior art keywords nodules treatment fluorine chlorine rock Prior art date 1946-04-26 Legal …

The invention is a process for the manufacture of highly citrate soluble phosphatic materials containing at least 18% P and not more than 0.18% F and involves the thermal defluorination of phosphate rock analyzing between 68 and 74 BPL (BPL % bone phosphate of lime or Ca3 (PO4)2 equivalent to P2O5 content of the rock). Such …

US2995436A - Defluorination of phosphate rock - Google Patents Defluorination of phosphate rock Download PDF Info Publication number US2995436A ... rock Prior art date 1957-11-29 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as …

My process provides a process for manufacturing a highly citrate-soluble phosphate containing at least 18 percent phosphorus using 68-74 BPL phosphate rock. The rate …

It was concluded that fused tricalcium phosphate with 0.24 per cent fluorine is a safe phosphorus supplement if used with discretion and a grain mixture containing 0.02 per cent or more of fluorine was found to be unsafe for feeding to dairy cattle. Summary Six dairy steers received three levels of fluorine in their grain rations (0.0048, 0.02 and 0.04 per …

G. L. Bridger, D. R. Boylan. Production of Fertilizer from Phosphate Rock. Industrial & Engineering Chemistry 1953, 45 (3), 646-652. DOI: 10.1021/ie50519a049.

Figure 4 shows a schematic flow sheet for the defluorination process of the phosphate rock [73]. The It was amount reported of energy by Bandyopadhyay for mining and 71 that physical the ...