Process of producing sodium hydrogenfluoride by using fluosilicic acid
A technology using fluosilicic acid and sodium bifluoride, which is applied in the chemical industry, can solve the problems of high cost of raw materials and insufficient quality of sodium bifluoride products, and achieve the effects of reducing raw material costs, increasing particle size, and ensuring quality
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[0029] Example 1
[0030] 1. After the soda ash is beaten, and 0.9 times the amount of 20% fluorosilicic acid required for soda ash is driven into the reactor at a constant speed, the stirring is started, and 0.2% of the amount of fluorosilicic acid is added to the silicon complexing agent (sodium triacetate ), turn on the steam, fully react, and the PH value at the end of the reaction is 8.5-9.
[0031] 2. After the reaction in the reactor is completed, the solid-solid separation is carried out using the reaction liquid with a specific gravity difference, and the solid-solid separation is sodium fluoride and silica. Silica can be sold as white carbon black after being filtered and dried. After centrifugation, the sodium fluoride is dried into the next step.
[0032] 3. After drying, the sodium fluoride is beaten, 0.1% seed crystals (325 mesh sodium hydrogen fluoride) are added, anhydrous hydrogen fluoride is introduced, and steam is introduced to control the temperature not lower ...
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[0034] Example 2
[0035] 1. After the soda ash is beaten, and 0.9 times the amount of 20% fluorosilicic acid required for soda ash is driven into the reactor at a constant speed, the stirring is started, and 0.2% of the amount of fluorosilicic acid is added to the silicon complexing agent (sodium triacetate ), turn on the steam, fully react, and the PH value at the end of the reaction is 8.5-9.
[0036] 2. After the reaction in the reactor is completed, the solid-solid separation is carried out using the reaction liquid with a specific gravity difference, and the solid-solid separation is sodium fluoride and silica. Silica can be sold as white carbon black after being filtered and dried. After centrifugation, the sodium fluoride is dried into the next step.
[0037] 3. After drying, sodium fluoride is beaten, 0.15% seed crystals (325 mesh sodium hydrogen fluoride) are added, anhydrous hydrogen fluoride is introduced, and steam is introduced to control the temperature not lower tha...
Example Embodiment
[0039] Example 3
[0040] 1. After the soda ash is beaten, and 0.9 times the amount of 30% fluorosilicic acid required for soda ash is driven into the reactor at a constant speed, start stirring, and add 0.2% of the amount of fluorosilicic acid silicon complexing agent (sodium triacetate ), turn on the steam, fully react, and the PH value at the end of the reaction is 8.5-9.
[0041] 2. After the reaction in the reactor is completed, the solid-solid separation is carried out using the reaction liquid with a specific gravity difference, and the solid-solid separation is sodium fluoride and silica. Silica can be sold as white carbon black after being filtered and dried. After centrifugation, the sodium fluoride is dried into the next step.
[0042] 3. After drying, the sodium fluoride is beaten, 0.1% seed crystals (325 mesh sodium hydrogen fluoride) are added, anhydrous hydrogen fluoride is introduced, and steam is introduced to control the temperature not lower than 60℃, and control...
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