The phosphate rock contains about 3–4% fluoride. F/P 2 O 5 weight ratios range from 0.10–0.14 and 0.04–0.06 for sedimentary and igneous rocks, respectively (Becker, 1983).The fluoride in the rock is converted into volatile compounds such as HF (from the reaction with sulphuric acid) and H 2 SiF 6 (from the further reaction of HF with …
WhatsApp: +86 18221755073
Phosphate ore is an important raw material for manufacturing fertilizers and phosphorous chemical products. While most of the phosphate resources cannot be directly treated as feed stock due to the low grade of P2O5 and high content of impurities. In order to obtain a qualified phosphate concentrate, the beneficiation of the low-grade …
WhatsApp: +86 18221755073
For instance, a phosphate product with P 2 O 5 grade of 29%-32% was obtained from a dolomitic phosphate rock with P 2 O 5 grade of 16.0% with P 2 O 5 recovery of 80%-84% [27]. ...
WhatsApp: +86 18221755073
A significant benefit of Abu Tartur phosphate rock processes for the recovery of the lanthanides lies in their relatively high content of lanthanides (averaging 0.11%), while the produced fertilizer would pollute the environment less with radioactive materials due to the low uranium content (averaging 25 mg/kg). ... Defluorination of the …
WhatsApp: +86 18221755073
Defluorination: Drying, which is a common step in. ... Approximately, 24% of the initial phosphate rock (with an average grade of 22% P 2 O 5) remains as residual phosphate which is retained in the spoil piles. To recover and prevent the presence of residual phosphate, the study proposes four new scenarios for improvement, including …
WhatsApp: +86 18221755073
In defiuorinatng phosphate rock by calcination in the presence of water vapor where the rock is nely divided and finely divided silica is included in the calcining charge in intimate association with the rock, the improvement which comprises including in the calcining charge from 35 to 45% by weight of nely divided silica and calcining the ...
WhatsApp: +86 18221755073
The phosphate rock contains about 3–4% fluoride. F/P 2 O 5 weight ratios range from 0.10–0.14 and 0.04–0.06 for sedimentary and igneous rocks, respectively …
WhatsApp: +86 18221755073
difficult in affected cattle, but oral aluminum salts and parenteral calcium are used. Prevention by altering water supply and grazing regime. Commercial defluorination of rock phosphate has made these toxic deposits safe.
WhatsApp: +86 18221755073
The meaning of DEFLUORINATE is to remove fluorine from. How to use defluorinate in a sentence.
WhatsApp: +86 18221755073
1.1. Phosphate Production Phosphate plays a significant economic role in developing countries because of the increasing demand on phosphate rock for fertilizer production and its importance in animal feed stocks, as well as food-grade phosphates and other industrial uses. The high demand for phosphate is typically fulfilled
WhatsApp: +86 18221755073
1. Introduction. Most of the fluorine in phosphate rock will eventually remain in the reaction solution in the form of fluorine ions(F-), if not removed, phosphate …
WhatsApp: +86 18221755073
Naturally occurring mineral products having sufficient phosphate content to be of commercial value are classified as phosphate rock. The grade or phosphate content of these products has been traditionally reported as percent Ca 3 (PO 4) 2, which is referred to as bone phosphate of lime (BPL), tricalcium phosphate (TCP), or triphosphate of …
WhatsApp: +86 18221755073
The meaning of DEFLUORINATE is to remove fluorine from. How to use defluorinate in a sentence.
WhatsApp: +86 18221755073
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 Ammerman et …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
Separation of refractory rock phosphate (P 2O s = 11.5%) from the Dalir area, Iran, containing quartz, calcite and other impurities, by calcination and flotation processes has been successfully ...
WhatsApp: +86 18221755073
Fluoride ions are commonly found in minerals like mica, fluorapatite, muscovite, topaz, biotite, sellaite, cryolite, muscovite, and fluorspar. However, the …
WhatsApp: +86 18221755073
The defluorination of phosphate rock as practiced at U.S. commercial production plants is a process on which there is a limited amount of published information available. Plant visits included only guarded technical discussions and limited plant observations. One of the primary reasons for these practices is the protection of trade secret ...
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
The fluorine content was determined by a potentiometric method with a fluoride ion-selective electrode [12]. Fig. 4 shows the change of the defluorination percentage as a function of the treatment temperature and steam pressure of the natural phosphate treated. We have observed no defluorination below 600°C and the steam …
WhatsApp: +86 18221755073
The method involves melting raw phosphate ores (phosphate rock, apatite, etc.) in a ... intensification of the defluorination process. The high specific heat of the molten …
WhatsApp: +86 18221755073
Phosphate rock requires processing to reduce the content of accessory minerals including quartz, chert, clay, feldspar, mica, calcite, and dolomite. It is necessary in fertilizer industry for the phosphate ores to have (1) P 2 O 5 content larger than 30%, (2) CaO/P 2 O 5 ratio smaller than 1.6, and (3) MgO content less than 1%. If phosphate ...
WhatsApp: +86 18221755073
§ 422.40 Applicability; description of the defluorinated phosphate rock subcategory. The provisions of this subpart are applicable to discharges resulting from the defluorination of phosphate rock by application of high temperature treatment along with wet process phosphoric acid, silica and other reagents.
WhatsApp: +86 18221755073
Phosphate rock minerals are the only significant global resources of phosphorus. The United States is the world's leading producer and consumer of phosphate rock, which is used to manufacture phosphate fertilizers and industrial products. Subscribe to receive an email notification when a new publication is added to this page. On the Questions ...
WhatsApp: +86 18221755073
The process comprises three main steps: solubilization of the phosphate rock concentrate with sulfuric acid, defluorination of the phosphoric acid solution with potassium sulfate and neutralization of the phosphoric acid solution with calcium hydroxide. The P-2O-5 precipitated in the pH range between 2.00 and 5.00 consisted basically of ...
WhatsApp: +86 18221755073
Fused magnesium phosphate seems to be a technical solution for some problems faced by the Brazilian industry of phosphate fertilizers, namely: high P2O5 losses in the fines of the beneficiation processes; high level of phosphorus fixation for water soluble fertilizers; Brazilian high dependency on sulfur for conventional phosphate fertilizers. The …
WhatsApp: +86 18221755073
The process has essentially three main steps: phosphate rock digestion, defluorination and neutralization. In the first step a phosphate rock slurry is batch …
WhatsApp: +86 18221755073
The present invention relates to a production method using a sintering method to produce the feed of calcium phosphate. The production method has the characteristics of low sintering temperature larger than or equal to 1180 DEG C, favorable defluorination effect, no anticorrosion requirements for mechanical equipment, simple and reliable production …
WhatsApp: +86 18221755073
Defluorination is carried out via calcination in a rotary kiln, which drives off the fluorine components and also makes the phosphorus bio-available. 1. Nodulizing. While most phosphate rock is destined for phosphoric acid production, some phosphate rock is converted into elemental phosphorus in a furnace.
WhatsApp: +86 18221755073
It has been commonly observed by various investigators of the phosphate-rock defluorination reaction that the amount of P2O5 converted to the citrate-soluble form is inversely related to the amount of …
WhatsApp: +86 18221755073