Реакция #2122476
ord-761eac44554c4077b7d8290548f3c5f8
Уравнение реакции
Реагенты
Условия реакции
Методика
0.62 tons of boric acid or 0.35 tons of boric anhydride is put in a reaction kettle, which is then added with 4 tons of hydrofluoric acid with the mass percent of 20% for reaction at 100° C. to generate fluoboric acid; the fluoboric acid is added with 3 tons of sodium carbonate aqueous solution with the mass percent of 20% for reaction to generate sodium fluoborate solution, the sodium fluoborate solution is concentrated, crystallized and bleached to obtain 0.95 tons of sodium fluoborate; 2 tons of titanium-iron concentrate powder is put in the reaction kettle, which is then added with 4.5 tons of hydrofluoric acid with the volume fraction of 20% for complete reaction at 120° C. to generate fluotitanic acid, and the fluotitanic acid, after being cooled, is added with 10 tons of the mixed salt aqueous solution of sodium carbonate and sodium hydroxide with the mass percent of 10%, pH is controlled within a range from 3 to 4, and after water and oxides of ferrous iron and ferric iron are separated, 4 tons of the mixed salt aqueous solution is further added to result in pH within a range from 7 to 8 so as to obtain sodium fluotitanate solution, the sodium fluotitanate solution is concentrated, crystallized and bleached to obtain sodium fluotitanate, and 1.24 tons of sodium fluotitanate is weighed from the obtained sodium fluotitanate; 0.53 tons of aluminum is weighed based on reaction ratio and put in a reactor, argon is fed into the reactor after evacuation, the reactor is heated up to 700° C. and then added with the mixture of 0.95 tons of sodium fluoborate and 1.24 tons of sodium fluotitanate in a manner of measurable flowing, rapid stirring is performed, and complete reaction is achieved 5 hours later so as to generate titanium boride and sodium cryolite; the molten liquid sodium cryolite is sucked out, cooled, crushed and weighed, and then quantitatively fed into a rotary reaction kettle together with the concentrated sulfuric acid which is added based on reaction ratio, reaction is performed within a temperature range from 400° C. to 500° C. to generate hydrogen fluoride gas as well as sodium aluminum sulfate and sodium sulfate, the hydrogen fluoride gas is collected and dissolved in water to obtain hydrofluoric acid, the mixture of the sodium aluminum sulfate and the sodium sulfate is crushed and then mixed with sodium hydroxide aqueous solution for reaction, and sodium sulfate solution is obtained after solid aluminum hydroxide is separated; the obtained hydrofluoric acid aqueous solution is recycled either for leaching titanium-iron concentrate to prepare sodium fluotitanate, or for leaching boric acid or boric anhydride to prepare sodium fluoborate.