Method for producing low-salt high-quality dense soda ash
A technology of heavy soda ash and soda ash, which is applied in the manufacturing industry of chemical basic raw material soda ash and the field of preparation of low-salt heavy soda ash, which can solve the problems of large waste liquid discharge and the inability to produce low-salt heavy soda ash by cold method combined with soda , to achieve the effect of good product quality and broad development prospects
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[0027] Example 1
[0028] Use lime-soda ash method to refine crude brine, that is, use Ca(OH) 2 To precipitate magnesium, use Na 2 CO 3 Make calcium precipitate, Mg(OH) 2 And CaCO 3 Precipitation and precipitation; refined brine absorbs ammonia to reach F NH3 100tt, T Cl - 90tt, F NH3 / Na+ 1.11, the temperature is 38℃, enter the carbonization tower, and the volume fraction of CO entering under the tower is 50% 2 The carbonation reaction is carried out on the gas, the temperature in the middle of the carbonization tower is controlled to 62 ℃, and the temperature is 30 ℃, and the CO in the carbonization tail gas 2 The volume fraction is 5%. After the sodium bicarbonate suspension is taken out from the lower part of the tower, it is filtered with a vacuum filter, sprayed and washed. The washing temperature is 40°C, and the amount of soda ash washing water per ton is 750kg. The sodium bicarbonate filter biscuit base contains salt The amount is 0.35%, the sodium bicarbonate is calcine...
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[0031] Example 2
[0032] Use lime-soda ash method to refine crude brine, that is, use Ca(OH) 2 To precipitate magnesium, use Na 2 CO 3 Make calcium precipitate, Mg(OH) 2 And CaCO 3 Precipitation and precipitation; refined brine absorbs ammonia to reach F NH3 101tt, T Cl - 89tt, F NH3 / Na+ 1.13, the temperature is 35℃, enter the carbonization tower, and the volume fraction of CO entering under the tower is 70% 2 The carbonation reaction is carried out on the gas, the temperature in the middle of the carbonization tower is controlled to 64°C, and the temperature is 34°C. The carbonization tail gas contains CO 2 The volume fraction is 7%. After the sodium bicarbonate suspension is taken out from the lower part of the tower, it is filtered with a vacuum filter, sprayed and washed. The washing water temperature is 42℃, and the amount of soda ash washing water per ton is 820kg. The sodium bicarbonate filter biscuit base contains salt The amount is 0.25%, the sodium bicarbonate is cal...
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