The method of obtaining translesanas phosphate magnesium

 

(57) Abstract:

The invention relates to the production of phosphate salts of magnesium, particularly to a method of obtaining high-water translesanas phosphate magnesium [Mg3(PO4)2nH2O] suitable for use as hydrated on the units for production of desalinated water, and it may also find application as catalysts, adsorbents and light fillers. Abounding trehzameshchenny phosphate magnesium with a highly developed surface of the crystalline separated from the suspension mixed aqueous solution at t = 60-70oC and pH 7,0-7,5 by mixing a previously prepared solution of caustic potash or potash with phosphoric acid with the molar ratio of potassium to phosphorus in the solution is 3:1, which is then mixed with a solution of magnesium sulphate, the molar content of magnesium which is equivalent to the molar content of potassium in the initial solution of a mixture, and from the mother liquor of the slurry after separation from it of magnesium phosphate secrete potassium sulfate by vacuum crystallization residue. The technical result consists in obtaining abounding translesanas phosphate magnesium with highly active poverhnostnie, specifically to a method for abounding translesanas phosphate magnesium [MD3(RHO4)2mo2About] suitable for use as hydrated on the units for production of desalinated water, and it may also find application as catalysts, adsorbents and light fillers.

A known method of producing remanifest in French patent 2431460 on the application 7515401 from 15.06.79, including a method of obtaining potassium phosphate and magnesium by reacting aqueous acidic solutions containing phosphate ions with potassium chloride and magnesium compounds with the properties of the base, characterized in that dissolve in acidic solution containing 20-160 g P2O5100 g of water, the amount of magnesium compound with the properties of the base, is stoichiometrically required for the formation of demanifest, and part of the total required quantity of potassium chloride, the resulting suspension is slowly injected after the addition of the remaining quantity of potassium chloride (the total amount reaches the molar ratio of K2O:P2O3from greater than 1:1 to a value slightly less than the saturation concentration), at a temperature below 40oFrom: the stoichiometric kolichestvennaia 130 g MgCl2in 1000 g of water in the reaction mixture; then separate the product from the mother liquor, washed it and dried.

The main disadvantage of this method is the complexity and multi-stage process and the lack of ways to control the dosing of the reagents in the practical implementation of the method. No indication of the quality of the final product and not solved the problem of processing obtained in the mother liquor.

A known method of producing oxide hydrate translesanas phosphate magnesium auth. St. 636182 from 7.04.77, by reacting solutions of magnesium sulfate, dogsleding of sodium phosphate and sodium bicarbonate followed by filtration and drying of the product, characterized in that in order to simplify the process and reduce its activity, solutions served simultaneously and the process is conducted at 45-60oWith, you get a product according to the experiment of the following composition: MgO - Of 28.9%; P2O3OR 34.7%; H2O - 36,2%.

The disadvantage of this method is a product with a low content of water of crystallization and the lack of solutions for the regeneration of the mother liquor obtained after separation from the suspension of the target product. No the ukta.

The technical object of the present invention to provide a wet translesanas phosphate magnesium with highly active surface of the obtained crystalline.

The technical result is reached that abounding trehzameshchenny phosphate magnesium with a highly developed surface of the crystalline separated from the suspension mixed aqueous solution at t=60-70oC and solution pH equal to 7.0 and 7.5, by mixing a previously prepared solution of caustic potash or potash with phosphoric acid with the molar ratio of potassium to phosphorus in the solution is 3:1, which is then mixed with a solution of magnesium sulphate, the molar content of magnesium which is equivalent to the molar content of potassium in the original solution mixing. From the mother liquor of the slurry after separation from it of magnesium phosphate secrete potassium sulfate by vacuum crystallization residue.

In the above-mentioned conditions of the suspension is excreted in the sediment water trehzameshchenny phosphate of magnesium, holding composed of up to 85% of crystallization and external moisture. When multiple dehydration of the hydrated phosphate of magnesium by heating it to 150-160oWith subsequent repulpable his podcastalley patterns.

An example of practical implementation of the proposed method.

1. Experience with caustic potash

400 mm solution containing 86 grams of KOH was mixed with a concentrated solution of phosphoric acid containing 50 g of N3RHO4that corresponds to a molar ratio of potassium to phosphorus 3:1. Prepared phosphatecalcium solution under vigorous stirring at t=60oWith neutralized prepared parallel to 400 mg of a solution of magnesium sulphate, containing 195 g MgSO47H2Oh, what an equivalent molar content of potassium in the original solution mixing. After complete mixing of the solutions prepared pH of the mixed stock solution was increased to 7.0 and from it almost completely knocked out wet hydrated translesanas of magnesium phosphate. The weight of the washed filter cake was 420 g, which corresponds to the weight content MD3(RHO4)2- 16,3%; H2On - 83,7%. After drying and calcining at t=150oWith the weight digidratirovannogo phosphate magnesium amounted to 89 g, which corresponds to the weight of the chemical composition in the sediment MD3(RHO4)2- 87.3 PER CENT; N2O - 12,5%. When reprocessing digidratirovannogo phosphate magnesium water in the tech what's repetition of the process of dehydration filtered hydrated and re-process it with water weight digidratirovannogo and saturated with water it remained virtually unchanged at 88-89 g after dehydration and 320-330 g after saturation with water.

From the mother liquor, after separation translesanas phosphate magnesium by vacuum crystallization residue at t=50oWith allocated precipitated 120 g of potassium sulfate.

2. Experience with K2CO3(potash)

420 g of a solution containing 106 g2CO3mixed with a concentrated solution of phosphoric acid containing 50 g of N3RHO4that corresponds to a molar ratio of potassium to phosphorus in solution 3:1. When mixing acid with a solution of potash been emitted from a solution of 34 g of CO2which if necessary can be captured and recovered in liquid or solid CO2.

The obtained phosphorus-potassium solution was mixed with t-60oWith g cooked in parallel 400 ml solution of magnesium sulphate, containing 195 g MgSO47H2O, which corresponds to a molar equivalent to the content of potassium in the original califorina solution. After complete mixing of the solutions prepared pH of the mixed solution was raised to 7.0, it dropped into the sediment hydrated translesanas of magnesium phosphate. The weight of the filtered precipitate amounted to 424 g, which corresponded to the content of SB3(RHO4)2AND 16.2%, N2About 83.8 percent. After drying and Prony MD3(RHO4)2- 87.8% and N2About to 12.2%. After processing digidratirovannogo sediment water for 20 min weight the filtered precipitate was 325

From the mother liquor, after separation of phosphate magnesium by vacuum crystallization residue and one stripped off cooling fluid to the 50oWith the highlighted residue 123 g K2SO4.

1. The method of obtaining translesanas phosphate of magnesium, comprising the mixing equivalent ratio of solutions of phosphate and magnesium salts, characterized in that the high-water trehzameshchenny phosphate magnesium with highly active surface of the crystalline separated from the suspension mixed aqueous solution at t= 60-75oC and pH 7,0-7,5 by mixing a solution of caustic potash or potash with phosphoric acid with the molar ratio of potassium to phosphorus equal to 3: 1, which is then mixed with a solution of magnesium sulphate, the molar content of magnesium which is equivalent to the molar content of potassium in the original solution blending.

2. The method according to p. 1, characterized in that from the mother liquor of the slurry after separation from it of magnesium phosphate secrete potassium sulfate by vacuum crystallization residue.

 

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