A method for separating and purifying ammonium paratungstate in ammonium tungstate solution
A technology of ammonium paratungstate and ammonium tungstate, applied in the field of separation of ammonium paratungstate, can solve the problems of many impurities, large particle size and low purity in ammonium paratungstate products, and achieve the effect of improving crystallization effect, uniform particle size and improving purity
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Embodiment 1
[0021] A method for separating and purifying ammonium paratungstate in ammonium tungstate solution, the specific steps are:
[0022] (1) Put the ammonium tungstate solution in an open container and place it in a dark place, and at the same time pass nitrogen into the solution, keep it for 8 hours and then filter to obtain the filtrate;
[0023] (2) Add the composite active reagent to the filtrate, the mass ratio of the filtrate and the composite active reagent is 10:1.3, heat it in a water bath to 70° C., and stir for 50 minutes to obtain a composite solution;
[0024] (3) Cool down the composite solution after stirring, stir with a graphite stirring rod while cooling down, the rotating speed is 50r / min, cool down to 40°C and keep for 30 minutes, precipitate crystals, filter to obtain crystal a and filtrate a;
[0025] (4) Continue to cool the filtrate a to 20°C, keep it for 10 minutes, precipitate crystals, filter to obtain crystals b;
[0026] (5) Combine crystal a and crys...
Embodiment 2
[0032] A method for separating and purifying ammonium paratungstate in ammonium tungstate solution, the specific steps are:
[0033] (1) Put the ammonium tungstate solution in an open container and place it in a dark place, and at the same time pass nitrogen into the solution, keep it for 9 hours and then filter to obtain the filtrate;
[0034] (2) Add the composite active reagent to the filtrate, the mass ratio of the filtrate to the composite active reagent is 10:1.5, heat it in a water bath to 75° C., and stir for 60 minutes to obtain a composite solution;
[0035] (3) After stirring, cool down the composite solution, stir with a graphite stirring rod while cooling down, the rotating speed is 100r / min, cool down to 45°C and keep for 40 minutes, precipitate crystals, filter to obtain crystal a and filtrate a;
[0036] (4) Continue to cool the filtrate a to 25° C., keep it for 20 minutes, precipitate crystals, filter to obtain crystal b;
[0037] (5) Combine crystal a and cr...
Embodiment 3
[0041] A method for separating and purifying ammonium paratungstate in ammonium tungstate solution, the specific steps are:
[0042] (1) Put the ammonium tungstate solution in an open container and place it in a dark place, and at the same time pass nitrogen into the solution, keep it for 9 hours and then filter to obtain the filtrate;
[0043] (2) Add the composite active reagent to the filtrate, the mass ratio of the filtrate to the composite active reagent is 10:1.6, heat the water bath to 70° C., and stir for 70 minutes to obtain a composite solution;
[0044] (3) Cool down the composite solution after stirring, stir with a graphite stirring rod while cooling down, the rotating speed is 80r / min, cool down to 50°C and keep for 40 minutes, precipitate crystals, filter to obtain crystal a and filtrate a;
[0045] (4) Continue to cool the filtrate a to 25° C., keep it for 20 minutes, precipitate crystals, filter to obtain crystal b;
[0046] (5) Combine crystal a and crystal ...
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