Method for preparing boric acid and sodium nitrate by treating ulexite (kramerite) or ascharite with nitric acid

[0038] Such as Figure 4 Shown, the present invention prepares the method for boric acid and sodium nitrate with nitric acid treatment sodium borolysis (calcium) stone ore or boron magnesium ore, prepares according to the following steps:

[0039] 1000kg sodium borolysis (calcium) stone (containing B 2 o 3 35%, Na 2 O 4.91%, CaO 14.1%, MgO 0.47%) ore is mixed with water and washed to remove chloride in the raw ore. Then mix the washed raw ore and 5000L boric acid mother liquor (co-saturated solution of boric acid and sodium nitrate at 25°C) in an acidolysis reactor, heat to 60°C under stirring conditions, and then add nitric acid with a concentration of 68% 473Kg, the temperature was raised to 85°C, and the reaction was timed and kept for 60 minutes. When the pH value at the end of the reaction was stable at 2.5-3.5, the reaction ended. Then pump the slurry into a filter press for filtration to obtain acid hydrolysis solution and a small amount of boron mud. The acid soluti

[0043] Such as Figure 4 Shown, the present invention prepares the method for boric acid and sodium nitrate with nitric acid treatment sodium borolysis (calcium) quarry, prepares according to the following steps:

[0044] 1000kg boron magnesium ore (containing B 2 o 3 38%, CaO 1.8%, MgO18%) ore is crushed to 40 mesh, mixed with circulating mother liquor (water for the first time) in the acid hydrolysis reactor, heated to 75°C under stirring conditions, and then added with 68% nitric acid 887.1Kg, then raise the temperature to 95°C, time the heat preservation reaction for 60 minutes, control the pH value at the end of the reaction to be stable at 2.5-4.5, and the reaction is over. Then pump the slurry into a filter press for filtration to obtain acid hydrolysis solution and a small amount of boron mud. The acid solution is sent to the cooling crystallizer, and the boric acid crystals are precipitated by cooling, and the boric acid is separated, washed, and dried to obtain indu