Method for preparing anhydrous sodium chromate
An anhydrous sodium chromate and sodium chromate technology, applied in the production of chromate/dichromate, bulk chemicals, etc., can solve the problems of waste of resources and high production cost, improve manpower, solve the problem of easy moisture absorption , the effect of good liquidity
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Embodiment 1
[0028] A method for preparing anhydrous sodium chromate, including the following steps:
[0029] Step 1: Put 8m of sodium chromate alkaline solution 3 And carbonization method to prepare carbonization solution of sodium alum 1m 3 Put it into the pretreatment storage tank, sample and analyze the pH to be 8.2. After stirring at room temperature for 15 minutes, the pH is retested to be 8.3 to obtain the sodium chromate pretreatment solution; the concentration of the carbonization solution is 925g·L -1 (In Na 2 Cr 2 O 7 ·2H 2 O meter), pH is 5.8;
[0030] Step 2. Pump the sodium chromate pretreatment liquid to the continuous evaporation crystallizer, use steam as the heat source, heat up to 81°C, start the vacuum pump, and control the pressure in the evaporator at -0.09MPa; control well during the evaporation process Feed rate of sodium chromate pretreatment liquid, observe the precipitation of sodium chromate crystals, when the solid-liquid ratio is 50%, discharge to the concentrated l...
Embodiment 2
[0033] A method for preparing anhydrous sodium chromate, including the following steps:
[0034] Step 1: Add 7m of sodium chromate alkaline solution 3 And carbonization method to prepare the carbonization solution of sodium alum 2m 3 Add to the pretreatment storage tank, sample and analyze the pH to be 7.6, and after stirring for 15 minutes at room temperature, the pH is re-measured to be 7.6 to obtain the sodium chromate pretreatment solution; the concentration of the carbonization solution is 925g·L -1 (In Na 2 Cr 2 O 7 ·2H 2 O meter), pH is 5.8;
[0035] Step 2: The sodium chromate pretreatment liquid is pumped to the evaporation crystallizer, using steam as the heat source, the temperature is raised to 90°C, the vacuum pump is started, and the pressure in the evaporator is controlled at -0.07MPa. During the evaporation process, control the feed rate of the sodium chromate pretreatment liquid and observe the precipitation of sodium chromate crystals. When the solid-to-liquid rati...
Embodiment 3
[0038] A method for preparing anhydrous sodium chromate, including the following steps:
[0039] Step 1: Add 6m of sodium chromate alkaline solution 3 And carbonization method to prepare the carbonization solution of sodium alum 3m 3 Add to the pretreatment storage tank, sample and analyze the pH 7.1, stir at room temperature for 15 minutes and then re-test the pH 7.15 to obtain the sodium chromate pretreatment solution; the concentration of the carbonization solution is 925 g·L -1 (In Na 2 Cr 2 O 7 ·2H 2 O meter), pH is 5.8;
[0040] Step 2: The sodium chromate pretreatment liquid is pumped to the evaporation crystallizer, using steam as the heat source, the temperature is raised to 102°C, the vacuum pump is started, and the pressure in the evaporator is controlled at -0.04MPa. During the evaporation process, control the feed rate of the sodium chromate pretreatment liquid and observe the precipitation of sodium chromate crystals. When the solid-liquid ratio is 36%, the material is...
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