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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 crystals and maximize the phosphate
The production process comprises a second step in which the reacted mass is filtered and the solution thus obtained is subsequently reacted with a lime slurry in order to transform soluble phosphates into insoluble di-calcium phosphates, having a side production of soluble calcium nitrate, said insoluble di-calcium phosphates are then separated ...
The producTion process for TooThpasTe A typical toothpaste process starts with a very viscous dicalcium phosphate slurry, which is the abrasive component. The slurry is blended with gum solution to form a white cream base or common base CB and small amounts of post-addition PA ingredients must be dispersed to make the final products.
The process produces three solid products 1 high-grade dicalcium phosphate dihydrate main product, 2 gypsum, which can be used for manufacturing of wallboards, cement, and plaster of paris, or for soil conditioning byproduct, and 3 iron hydroxide FeOH 3-rich product which can be used for pigment production byproduct. The solid ...
Phosphate rock used for fertilizer is a major NORM due to both uranium and thorium. Phosphate is a common chemical constituent of fertilizer. It is principally mined from apatite and phosphate rocks phosphorite in which the concentration of phosphate has been enhanced by sedimentary, igneous, weathering, and biological processes.
The process of producing feed grade calcium phosphate features that the calcium phosphate producing process includes the first liquid phase neutralizing reaction between dilute phosphoric acid and calcium containing compound in the reactor to produce calcium dihydrogen phosphate slurry, the subsequent adding calcium containing compound for the second liquid phase
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Figure 4-3 shows a flow sheet which is typical of the continuous normal super- phosphate process. Phosphate rock 98 . 0.147 mm is fed at a controlled rate to a mixer where it is thoroughly mixed with sulfuric acid which has been diluted to about 75. The rock-acid slurry discharges from the mixer to a pug mill where additional mixing occurs ...
The present invention relates to the making of monocalcium phosphate, and more particularly to the process hereinafter described which results in the quick and economical production of a high grade monocalcium phosphate. In accordance with our process, a mixing machine of the kneading type is charged with hydrated lime, to which is added a ...
-monocalcium phosphate process machine-Dicalcium Phosphatewith Animal Bone Manufacturing . Dicalcium phosphate slurry rote production processicalcium phosphate manufacturing process techasiahe process for the production of a granular, animal feed grade, dicalcium phosphate product which comprises forming a slurry having a solids content
Dec 21, 2004 AC impedance spectroscopy was used to study the hydration process and behavior of calcium phosphate cement. The results indicated that this method based on the theory of electrochemistry had certain advantages in the analysis of continuous microstructural changes of cement during the hydration process.
A process is disclosed for the production of granulated dicalcium phosphate dihydrate from fine-grained, powered dicalcium phosphate dihydrate, wherein 80 t0 95 of dicalcium phosphate dihydrate with a grain size of less than 120 m and 20 to 5 of calcium hydroxide with a grain size of less than 120 m are dry mixed and continuously sprayed and granulated
Apr 01, 1994 A new process for the production of defluorinated dicalcium phosphate using phosphate rock was developed. This new process has the main characteristic of being clean, without the production of any liquid waste. The process has essentially three main steps phosphate rock digestion, defluorination and neutralization.
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