High-efficiency, energy-conservation and clean method for producing chromate
A manufacturing method and chromate technology, applied in the direction of chromate/dichromate, etc., can solve the problems of little commercial significance, failure to realize economic operation, complicated operation, etc. The effect of reaction efficiency
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example 1
[0034] Adopt ferrochrome with 60.10% chromium content, 30.40% iron content, 7.10% carbon content and 2.50% silicon content as raw material to prepare the reaction initial solution. The formula is 100g ferrochrome, 80g caustic soda, and 1000mL water, which are placed in a 3000mL reaction kettle. The cold state is filled with oxygen into the kettle, and the oxygen pressure is 3.55MP. The heating voltage is 180v, the stirring speed is 350rpm, the heating reaction is carried out at 280°C for 30 minutes, the temperature is naturally cooled to room temperature and the material is discharged, and the solid-liquid separation is carried out. The filter cake is washed many times until there is no characteristic color of hexavalent chromium, and the chromium conversion is detected. The rate is 81.52%. Obtained 49.1 g of reddish-brown dry filter cake, containing 26.11% of chromium, 69.86% of iron and 4.02% of silicon as oxides.
example 2
[0036] Adopt ferrochrome with 60.10% chromium content, 30.40% iron content, 7.10% carbon content, and 2.50% silicon content as raw material to prepare the reaction initial solution. The formula is 200g ferrochrome, 200g caustic soda, and 1000mL water, which are placed in a 3000mL reaction kettle. The cold state is filled with oxygen into the kettle, and the oxygen pressure is 7.10MP. The heating voltage is 180v, the stirring speed is 350rpm, the heating reaction is carried out, and the temperature is kept at 280°C for 10 minutes, the temperature is naturally cooled to room temperature, and the solid-liquid separation is carried out. The rate is 85.94%. 148.4 g of reddish-brown dry filter cake was obtained, containing 21.19% of chromium, 74.52% of iron and 4.29% of silicon as oxides.
example 3
[0038]Adopt ferrochrome with 60.10% chromium content, 30.40% iron content, 7.10% carbon content and 2.50% silicon content as raw material to prepare the reaction initial liquid. The formula is 200g ferrochrome, 180g caustic soda, and 500mL water, which are placed in a 3000mL reaction kettle. The cold state is filled with oxygen into the kettle, and the oxygen pressure is 5.92MP. The heating voltage is 180v, the stirring speed is 350rpm, the heating reaction is carried out at 280°C for 20 minutes, the temperature is naturally cooled to room temperature and the material is discharged, and the solid-liquid separation is carried out. The filter cake is washed many times until there is no characteristic color of hexavalent chromium, and the chromium conversion is detected. The rate is 75.86%. 111.7 g of reddish-brown dry filter cake was obtained, containing 31.59% of chromium, 64.69% of iron and 3.72% of silicon as oxides.
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