Nitric acid acidulation of phosphate rock and pyrolysis

The attack of nitric acid upon phosphate rock to produce soluble phosphate is represented by equation 1. 20HNO 3 + Cal0(PO4)6F2---~ 6H3PO 4 + 10Ca(NO3) 2 + 2HF (1) The chemistry is seen to be similar to that ob- tained when sulfuric acid is employed, except that the by-product phosphogypsum is replaced

WhatsApp: +86 18221755073

THE PRODUCTION OF DI-CALCIUM PHOSPHATE FTY TEE DIRECT ACIDULATION …

They were produced by reacting sulphuric acid with phosphate rock (Tunisia) in the DH-process. ... As the moisture content of the acidulated rock charged to the autoclave is increased, the decomposition of mono-calcium phosphate to di- calcium phosphate and phosphoric acid becomes less pronounced. In this work when the moisture content of the ...

WhatsApp: +86 18221755073

Waste Treatment and Resource Utilization: Removal and …

It has been recognized that the nitric acid decomposition of phosphate rock for the production of phosphoric acid is generally feasible and desirable., which has a promising future. Because of the limitations of HF generation efficiency, a significant amount of SiO 2 in phosphate rock products is still filtered and separated as nitric acid ...

WhatsApp: +86 18221755073

Recovery of Rare Earth Elements and Sulfuric Acid Solution from

OCP, the state-owned Moroccan phosphate rock mining company and phosphoric acid manufacturer, wants to stop the practice of seawater phosphogypsum disposal in the near future [9] and is actively ...

WhatsApp: +86 18221755073

Phosphoric acid from phosphate rock

Processes for extraction of P2O3 from phosphate rock by sulfuric acid vary widely, but all produce a phosphoric acid—calcium sulfate slurry that requires soHds-Hquid separation (usually by filtration (qv)), countercurrent washing of the soHds to improve P2O3 recovery, and concentration of …

WhatsApp: +86 18221755073

Enhanced absorption of SO2 from phosphogypsum …

In this paper, phosphate slurry was used to absorb SO 2 generated during the PG decomposition to produce phosphoric acid. The effects of operating conditions such as …

WhatsApp: +86 18221755073

Recovery of Rare Earth Elements from Phosphate Rock by

Based on the decomposition processes of phosphate rock by H2SO4, HNO3, HCl, H3PO4, various REEs recovery processes via crystallization, precipitation, solvent extraction and ion exchange methods ...

WhatsApp: +86 18221755073

Simultaneous recovery of rare earth elements and phosphorus …

For REEs recovery from leaching solutions originated from phosphate rock by acid decomposition, methods such as precipitation, crystallization, solvent extraction, ion exchange have been systematically studied. 17, 18, 19 Each method has its own advantages and disadvantages. For instance, due to the merits of simple technology and easy application …

WhatsApp: +86 18221755073

Phosphate Rock Properties

A typical process is described as follows: Calculated quantities of concentrated sulfuric acid (60° to 66° B.) diluted with weak phosphoric acid and a recirculated slurry of partly decomposed phosphate rock are fed continuously to one or more agitator tanks, then discharged into the first of a series of mixing tanks to which weighed ...

WhatsApp: +86 18221755073

Solved Phosphoric acid can be prepared by reaction of

Answer to Phosphoric acid can be prepared by reaction of. Science; Chemistry; Chemistry questions and answers; Phosphoric acid can be prepared by reaction of sulfuric acid with "phosphate rock" according to the equation: Ca3(PO4)2 + 3H2SO4 → 3CaSO4 + 2H3PO4 Suppose the reaction is carried out starting with 133 g of Ca3(PO4)2 and 93.0 g of H2SO4.

WhatsApp: +86 18221755073

Phosphate Rock Properties

The lower grade is usually manufactured by decomposing phosphate rock with a mixture of sulfuric and phosphoric acids; the higher grade (also called triple superphosphate) is produced by treating the rock with phosphoric acid alone.

WhatsApp: +86 18221755073

Rigid-Flexible Combined Impeller Enhancement in Leaching …

leaching and resource utilization of phosphate rock attracts extensive attention. Efficient leaching of phosphate rock has been widely studied over the past few decades.9 Guo et al.10 studied ultrasound-enhanced decomposition of phosphate rock in a sulfuric acid medium and found that ultrasonic vibrations could improve

WhatsApp: +86 18221755073

Leaching Kinetics of Rare Earth Elements in …

Phosphate rock has been considered as one of the most significant secondary rare-earth resource, and the utilization of rare earth elements (REEs) in phosphate rock has attracted increasing attention. In this study, the …

WhatsApp: +86 18221755073

EVALUATION OF POTENTIAL COMMERCIAL …

sulfur dioxide gas generated by the thermal decomposition of gypsum to commercially acceptable sulfuric acid, the leaching agent wet process acid producers …

WhatsApp: +86 18221755073

(PDF) Fundamentals of the Wet-Process Phosphoric …

This paper is devoted to the fundamentals of natural phosphate rock dissolution under conditions close to those in the industry of the wet-process phosphoric acid production.

WhatsApp: +86 18221755073

Treatment of phosphate rocks with hydrochloric acid

Recovery of P and REE from phosphate rock by leaching with sulphuric acid, hydrochloric acid and nitric acid has been studied, Wang 2010, Shlewit 2011, Jorjani 2011, Sandström 2012. For the ...

WhatsApp: +86 18221755073

Advances in Phosphogypsum Calcination and Decomposition …

The process employs electric heating, resulting in high energy and electricity consumption. 7 (2) The sulfuric acid method, 1 in which phosphoric acid is extracted by decomposing phosphate rock with sulfuric acid, is more widely known as the wet process for producing phosphoric acid. 3,8,9 The most prominent feature of this method is that ...

WhatsApp: +86 18221755073

The decomposition coefficient of phosphate rock by 93% sulfuric acid

Download scientific diagram | The decomposition coefficient of phosphate rock by 93% sulfuric acid depending on the interaction time from publication: IOP Conference Series: Earth and ...

WhatsApp: +86 18221755073

Mathematical modeling of the dissolution of phosphate rock into …

(14) are not in good agreement of the experimental results for a leaching phosphate rock into sulfuric acid. The gap is substantial for the high reaction time (Fig. 6). The reason of this is that the formation of the solid (gypsum) can clog …

WhatsApp: +86 18221755073

The decomposition coefficient of phosphate rock by …

Download scientific diagram | The decomposition coefficient of phosphate rock by 93% sulfuric acid depending on the interaction time from publication: Simple superphosphate by two-stage acid...

WhatsApp: +86 18221755073

(PDF) Flow of simple superphosphate using two-stage decomposition …

The methods for producing simple superphosphate by two-stage sulfuric acid decomposition of natural phosphates are analyzed. For the first stage, the process of decomposition of high-carbonate ...

WhatsApp: +86 18221755073

Review Recovery of rare earth elements from phosphate rock by

In 1965, researchers from Romania decomposed phosphate rock with HCl, precipitated REEs from chloride-phosphate by precipitation with lime milk, and produced REO concentrate with a purity about 87.9% by further treatments including acid redissolution, oxalic acid precipitation, and calcination [60], [61]. However, due to the relative low ...

WhatsApp: +86 18221755073

Rigid-Flexible Combined Impeller Enhancement in Leaching of Phosphate

Efficient leaching of phosphate rock has been widely studied over the past few decades. 9 Guo et al. 10 studied ultrasound-enhanced decomposition of phosphate rock in a sulfuric acid medium and found that ultrasonic vibrations could improve the degree of suspension of mineral particles as well as the leaching rate increased about 10% under the ...

WhatsApp: +86 18221755073

Treatment of phosphate rocks with hydrochloric acid

The primary sulfuric acid extraction process of phosphate rocks results in the accumulation of phosphogypsum. ... The temperature rises because of the exothermic nature of the reaction and ing takes place due to the decomposition of carbonates. ... A farther advantage of using diluted acid for leaching phosphate rock is the formation of ...

WhatsApp: +86 18221755073

Phosphoric acid production by attacking phosphate rock with …

During the classical production of phosphoric acid, the reaction between sulfuric acid and phosphate rock generates suspension. The latter is subsequently filtered and concentrated by evaporation process resulting in fluorine or acid gas. ... The loss of cooling capacity increases the risk of phosphogypsum and chukrovite decomposition and also ...

WhatsApp: +86 18221755073

Phosphate Rock

Single superphosphate (9% P) is manufactured by reacting ground rock phosphate with sulfuric acid while double (16% P) and triple (19% P) superphosphate are produced by reacting ground rock phosphate with phosphoric acid. Where N and P additions are required, monoammonium phosphate (MAP) and diammonium phosphate (DAP) are often used.

WhatsApp: +86 18221755073

Sustainable Approach for Recovery of Sulfur from Phophogypsum

Phosphogypsum is a discarded byproduct from the processing of phosphate rock in plants producing phosphoric acid and phosphate fertilizers, such as superphosphate. The wet chemical phosphoric acid treatment process, or "wet process," in which the phosphate ore is digested with sulfuric acid, is widely used to produce phosphoric acid and ...

WhatsApp: +86 18221755073

(PDF) Simple superphosphate by two-stage acid treatment of phosphate

The decomposition coefficient of phosphate rock by 93% sulfuric acid depending on the interaction time Phosphorus reserves of the Kyzylkum deposit Figures - available via license: Creative Commons ...

WhatsApp: +86 18221755073

Effect of phosphate rock quality on the efficiency of …

incomplete decomposition of the phosphate material by the sulfuric acid and another part – as a result of the co-precipitation (co-crystallization) of P 2 O 5 with CaSO 4 .

WhatsApp: +86 18221755073

Quality of Phosphate Rocks from Various Deposits Used in Wet …

The accuracy and precision of the used methods were evaluated by analysis of standard reference materials (SRM) for Western Phosphate Rock (NIST 694). The recovery was 85.3% for U and 109% for K 2 O, and the RSD ranged from 0.67% to 12.8%. Keywords: phosphate rock, wet phosphoric acid, phosphate fertilizers, elemental analysis. 1. Introduction

WhatsApp: +86 18221755073