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.
FIELD: varnish-and-paint industry.
SUBSTANCE: invention is designed for use in construction and chemical industry when dyeing building materials and parts, manufacturing enamels, glazes, ceramic paints, and polymer fillers. Pyroxene mineral (diopside or vollastonite) is brought into interaction in solution with salt colored by iron triad element cation (iron, cobalt, or nickel molybdophosphate) synthesized and crystallized directly in solution at 30-60°C. Interaction and precipitation of the salt on the surface of pyroxene mineral is effected during 15-30 min. Thus obtained precipitate is filtered and dried. Inorganic pigment 50-90% pyroxene mineral and 10-50% molybdophosphate. Color spectrum of pigments extends from lilac to brown depending on nature and quantity of chromophore.
EFFECT: increased coloration intensity and color purity.
2 cl, 2 tbl, 2 ex
SUBSTANCE: method to prepare charge to produce bioceramics includes dosing of initial components and their grinding in a planetary mill. Initial components are hydroxyapatite and sodium dihydrophosphate at the mass ratio of "hydroxyapatite/sodium dihydrophosphate" in the range of 20/80 - 85/15.
EFFECT: method makes it possible to prepare charge for bioceramics of new generation, capable of resorption and stimulating new bone tissue.
1 tbl, 1 ex
SUBSTANCE: chromium phosphate is obtained in a reactor by dissolving chromium trioxide in water. Orthophosphoric acid and a stabilising additive - ethanol - are then added. A strong reducing agent - aqueous hydrazine-hydrate solution - is slowly added to the obtained mixture of chromic acid, orthophosphoric acid and ethanol in an amount which enables formation and maturation of chromium phosphate particles, suspension pH of 4-7 and concentration of chromium phosphate of 50-100 g/cm. The end product is then filtered and dried. The filtrate is returned to preparation of the mixture of chromium trioxide, orthophosphoric acid and ethanol.
EFFECT: invention simplifies the technique and completely prevents formation of waste water.
1 tbl, 6 ex
SUBSTANCE: rare-earth metal phosphates are crystallised from supersaturated solutions of wet-process phosphoric acid using a solid seeding material - granular cerium phosphate hemihydrate. Continuous back and forth movement of said seeding material is generated in fluidised bed conditions. The fluidised bed is created by continuous flow of air from the bottom up, opposite to the movement of the wet-process phosphoric acid solution.
EFFECT: invention increases the degree of pickup of a concentrate of rare-earth metal phosphates while reducing consumption of seeding material.
2 tbl, 1 ex
SUBSTANCE: method of obtaining iron-chrome-phosphate product includes dissolution of 60-80 g of cast iron chips and 160-210 g of iron oxide in 650-850 g of orthophosphoric acid of 85%-90% concentration, with carrying out heating to 90°C-100°C in case of reaction slowing down, after dissolution of cast iron chips and iron oxide obtained solution is cooled, 85-115 g of chrome oxide are added, and then obtained paste of iron-chrome-phosphate product is dried and milled. Fireproof composition contains mixture of obtained iron-chrome-phosphate product, mineral filling agent and water.
EFFECT: invention makes it possible to obtain iron-chrome-phosphate product, resistant to high temperatures, which adds properties of high adhesiveness, chemical resistant and fire resistance to fireproof compositions.
2 cl, 2 ex
SUBSTANCE: invention relates to production of complex type phosphate compounds. Method of producing a complex metal phosphate product comprises dissolving iron (Fe) in form of iron shavings in 85 %-90 % orthophosphoric acid (H3PO4), then while stirring, gradually dissolving powdered aluminum hydroxide or bauxite or boehmite powder and iron oxide (Fe2O3) or a mixture thereof, while slowing down reaction heating to 90 °C-100 °C, after dissolution of components cooling solution to room temperature, further, while stirring, adding to the obtained solution a solution of chromium oxide, resulting paste of a complex iron-chromium-aluminophosphate product is dried and ground to obtain a powder of a complex metal phosphate gross product of formula
EFFECT: invention enables production of industrial complex metal-phosphate product with low solubility in water, in form of paste or dry powder with high stability properties during storage, and wide range of application.
3 cl, 2 ex
SUBSTANCE: fertiliser consists of potassium phosphate with the formula K3H3(PO4)2 and water in an amount of 10 wt % or less. The production process comprises: i) a step of producing a concentrated aqueous solution of phosphoric acid (PA) and a concentrated aqueous solution of potassium hydroxide (KOH), ii) a step of combining the said concentrated solutions produced in step i) in a reactor providing a reaction temperature in the range of 85 to 120°C, where PA and KOH are used in a weight ratio of 1.14 to 1.22, to produce a liquid reaction mixture, iii) a step of drying the said reaction mixture produced in step ii) in a vacuum drying apparatus, whereby a solid material is produced, wherein the said drying step comprises draining the said reaction mixture produced in step ii) to the said dried material, and iv) cooling the said solid material produced in step iii).
EFFECT: producing a solid bulk fertiliser having a neutral pH without a tendency to caking.
13 cl, 2 ex
SUBSTANCE: invention can be used in the production of thermomechanically stable materials and products based on them, requiring high resistance to heat shock and resistant to sudden temperature changes. The method for the synthesis of metal sulfate-phosphates involves the determination of the maximum permissible temperature range, within which the synthesis proceeds without loss of sulfur. The starting reagents are selected to facilitate the reaction with the formation of intermediate simple sulfates, the decomposition temperature of which is within the maximum allowable synthesis temperature range. Solutions of metal salts are produced from the initial reagents. Solutions of metal salts are mixed with solutions of acids H3PO4 and H2SO4. Stepwise drying of the reaction mixture is performed at the temperatures of 90°C and 130°C. Further heat treatment of the reaction mixture within the maximum permissible temperature range is carried out for 6-48 hours with dispersion and control of the chemical and phase composition by the methods of electron probe microanalysis and radiography after each heat treatment. Metals with similar ionic radii are selected and the combinations of the following metal cations are used: M+ - Na and K, M2+ - Mg, Ba, Pb, M3+ - Cr, Fe, M4+ - Zr. Nitrates, metal chlorides, chromium acetate are used as starting reagents.
EFFECT: preventing the loss of sulfur due to its binding to an intermediate sulfur-containing precursor with a high decomposition temperature.
6 cl, 2 dwg, 8 tbl, 4 ex
SUBSTANCE: method comprises the following steps: i) phosphoric acid (PA) provision as an aqueous solution and partial neutralization with an aqueous neutralizer selected from monopotassium phosphate (MPP) and potassium hydroxide (KOH) in a reactor, ii) drying of the said aqueous mixture obtained in step i) in a vacuum drier to obtain a solid material containing less than 5 wt % of water, iii) cooling of the said solid material obtained in step ii) to ambient temperature, and iv) mixing of the said cooled solid material with a solid source of magnesium.
EFFECT: production of bulk solid fertilizer without tendency to caking, including acidic phosphate with a formula.
11 cl, 2 ex
SUBSTANCE: method involves mixing ground phosphorite with fine elementary sulphur in weight ratio (ground phosphorite: fine elementary sulphur) ranging from 6:1 to 4:1 and urea phosphate in weight ratio to ground phosphorite ranging from 1:0.8 to 1:8.5. The mixture then undergoes granulation by pressing. Before mixing with other components, the ground phosphorite is treated with humate in amount of 0.1-1.0 wt %. Temperature during granulation ranges from 30 to 70°C.
EFFECT: invention enables to obtain fertiliser which vegeto-synchronously provides plants with nutrient elements, with increase in effectiveness thereof while widening the raw material base.
3 cl, 2 ex
SUBSTANCE: invention relates to processing phosphate material and can be used in the technology of mineral fertilisers, feed grade and food phosphates. The method for defluorination of apatite involves adding acid to a mixture of apatite concentrate and water in a reactor. The acid used is phosphoric acid with concentration of 90% which is first heated to 145°C. The phosphoric acid is fed into the reactor to a mixture of apatite concentrate and water at temperature 170-180°C while stirring constantly. Pressure is then lowered to 1 atm and steam is released at pressure 14-16 atm. The gas-vapour phase then undergoes distillation and absorption. Separation of phases and defluorination products is carried out after distillation at reactor pressure 1 atm and temperature 20°C.
EFFECT: enabling removal of fluorine from the reaction mixture and obtaining fluorine-containing products - defluorinated calcium phosphates, defluorinated concentrate of rare-earth elements and strontium while ensuring ecological cleanness of the process.
5 cl, 2 ex
SUBSTANCE: method of preparing phosphorus-magnesium fertiliser which comprises melting the charge mixture of natural phosphates, olivine and dolomite or mica-containing products, and MnO2 is additionally added to the charge mixture in an amount of 2-10 wt %.
EFFECT: invention enables to improve the degree of transition of P2O5 to lemon-soluble form while maintaining power consumption.
SUBSTANCE: invention relates to agriculture. The method of producing magnesium phosphate fertiliser, which involves melting a mixture of natural calcium phosphates, olivine and dolomite, wherein 2.0-6.0 wt % aqueous solution of liquid glass, containing 23.0-26.0 wt % free colloidal silica, and 1.0-2.0 wt % belite are added to the mixture, and the mixture is melted at temperature of 1240-1300°C.
EFFECT: invention lowers the melting point of the mixture in the fertiliser while maintaining a high degree of conversion of magnesium oxide to a form that is assimilable by plants.