A method of processing phosphate to phosphate obustroenny

 

(57) Abstract:

The invention relates to a method of processing phosphate rock on obespechenie phosphates, used as fertilizer and feed product. A method of processing phosphate rock on obustroenny phosphate consists in mixing phosphate rock with phosphoric acid and an alkaline agent and subsequent firing of the charge, while the phosphate raw material in the amount of 4.5-6.5% of the total mass is mixed with phosphoric acid and an alkaline agent to the ratio of Cao:Na2O:P2O5=(0,25-0,34):(0,1-0,45):1, the filtrate was separated and mix it with the rest of phosphate and alkaline agent. The proposed method can provide a high quality finished product, reduce the consumption of alkaline reagent and improve the reliability of the technological mode. Technological mode calcination stable, and the process proceeds without the formation of wall accretions, since under these conditions there is no decarbonization soda. table 1.

The invention relates to a method of processing phosphate rock on obespechenie phosphates, used as fertilizer and feed product

A method of obtaining objecttoremove phosphate by obrabotliva on a disk granulator, burn in the presence of water vapor at 450oAnd then at 1350oC. the Finished product has a ratio of Cao: P2ABOUT5: Na2About= (3,0-3,5): (1,0-1,2): (0,12-0,14). (Pat. USA 4152398, CL 01 In 25/26, 1979).

The disadvantage of this method is the complexity of the technological process.

The closest technical solution is the method of processing phosphate rock on obustroenny phosphate by shifting phosphate rock with phosphoric acid and soda, followed by firing the obtained mixture at this pre-mixing phosphate rock with phosphoric acid and the process is conducted to obtain in a mixture of P2O5freeequal to 0.05-20%, and then add soda in an amount necessary to obtain the mixture ratio R2O5lemon-soluble to P2O5equal (0,29-0,65):1. (RF patent 2088553, on. 27.08.97. Bull. 24).

Shop objecttoremove phosphate JSC "Phosphorit" using this method has the following parameters.

1 t objecttoremove phosphate spent 0,857 t Kovdor Apatite containing 36-38% R2O5and 3-3,5% CO2, 0,128 t R2O5as of 23% phosphoric acid and 0.15 t soda. The resulting p Value P2O5lim/ P2O5totalis 87-90%. Loss of alkaline agent 6.5-25,9%, and in terms of R2ABOUT5limthey grow to 7.6-29%.

The disadvantage of this method is the lack of quality in the finished product, a high consumption of alkaline reagent through pylones, the instability of the technological regime calcination. When injected into the furnace is decarbonation soda flowing with significant endothermic effect, which leads to cooling of the charge and the emergence of wall accretions.

The task of the invention is to improve the quality of the finished product, reducing consumption of alkaline reagent, increasing stability of the technological mode.

A method of processing phosphate rock on obustroenny phosphate consists in mixing phosphate rock with phosphoric acid and an alkaline agent and subsequent firing of the charge, while the phosphate raw material in the amount of 4.5-6.5% of the total mass is mixed with phosphoric acid and an alkaline agent to the ratio of Cao:PA2O:P2O5=(0,25-0,34):(0,1-0,45):1, the filtrate was separated and mix it with the rest of phosphate and alkaline agent.

what these raw materials with phosphoric acid to happen almost complete dissolution of phosphate rock and a partial saturation of the liquid phase of the calcium ion with the simultaneous deposition of sulfate ion, contained in wet-process phosphoric acid, in the form of gypsum. When filing in the mixture of sodium reagent leads to the formation of phosphate sodium with simultaneous defluoridation acid. When the molar ratio of CaO: Na2O: P2O5= (0,25-0,34): (0,1-0,45):1. Department of sludge containing impurities, allows to increase the content of P2ABOUTLimin the finished product. The introduction of the remaining quantity of alkaline agent to the mixture after mixing the main mass of phosphate rock with filtrate is made in the form of caustic soda or soda. Caustic soda is introduced into the second stage as a more active alkaline agent than a soda can neutralize the remaining acid to a higher alkalinity. With the introduction of soda on the second stage of mixing a small portion of the filtrate is served in the finished mixture at the outlet of the screw-mixer for complete wetting and extinguish the remaining soda. Under such conditions it is fully binding of alkaline agent in the calcium-sodium-phosphate and loss of alkali does not occur.

The essence of the process is illustrated by examples.

Example 1. 45 kg of Phosphate concentrate containing 28% P2O5mixed with 450 kg of wet-process phosphoric acid, coderetreat in the amount of 475 kg contained to 123.5 kg P2O5, lower than the 5.37 kg Na2About 12 kg of Cao, 2 kg F, 3 kg SO3. The ratio of CaO:Na2O: P2O5=0,25:0,1:.1,955 kg Kovdor Apatite containing 38% P2O5and 3.1 % CO2mixed with the filtrate, and then with caustic soda in the number of 56.5 kg of the Mixture is directed into the furnace and calcined at 1350oC.

Example 2. 65 kg of phosphate concentrate containing 28% P2O5mixed with 650 kg wet-process phosphoric acid composition specified in example 1, and from 23.1 kg soda. The precipitate is filtered off. The filtrate number 679 kg contains 163 kg P2O5, 11.3 kg Na2O, 16,4 kg of Cao, 1 kg of fluoride, 2 kg SO3. The ratio of CaO: Na2O:P2O5=0,29:0,18:1,935 kg Kovdor Apatite containing 36% R2O5and 3% CO2mixed with the filtrate, and then with 63.4 kg caustic soda. The mixture is directed into the furnace and calcined at 1350oC.

Example 3. 39 kg Kovdor Apatite concentrate, containing 36% R2O5mixed with 500 kg of wet-process phosphoric acid composition specified in example 1, and then from 52.5 kg soda. The precipitate is filtered off. The filtrate in the amount of 540 kg contains 125 kg P2O5, 25 kg Na2O, 17 kg of Cao, 1 kg F, 2 kg SO3. The ratio of CaO:Na2O:P2waste, and then with 57 kg soda. Then finish the charge serves 100 kg of the filtrate to a complete quenching soda. The mixture is directed into the furnace and calcined at 1350oC.

The increase in the number of phosphate raw materials to the first stage mixing is impractical, as it will be full of decomposition, leading to the loss of phosphate from the sediment, when submitting fewer raw materials in the solution will be an insufficient amount of calcium ions. Supply more soda 1 stage than 50% reduces the separation of the liquid and solid phases.

The table shows the characteristics of the finished product and the consumption of alkaline reagent offer and known methods.

As can be seen from the table, the process and the suggested range provides a higher quality of the finished product, reducing consumption of alkaline reagent and reliability of the technological regime.

Technological mode calcination stable, and the process proceeds without the formation of wall accretions, since under these conditions there is no decarbonization soda.

A method of processing phosphate rock on obustroenny phosphate, comprising a mixture of phosphate rock with phosphoric acid and an alkaline agent and the settlement of xtraction phosphoric acid and an alkaline agent to the ratio of Cao: PA2O: P2O5= (0,25-0,34): (0,1-0,45): 1, the filtrate was separated and mix it with the rest of phosphate and alkaline agent.

 

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