A method for recovering ammonia and high-quality gypsum from ammonium sulfate
A kind of ammonium sulfate, high-quality technology, applied in chemical instruments and methods, preparation/separation of ammonia, calcium/strontium/barium sulfate, etc., to achieve the effect of low energy consumption and simple process
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Embodiment 1
[0037] The crystallization law of the mixed reaction of ammonium sulfate and milk of lime was investigated experimentally in a 2L stirred tank. First, 900ml of Ca(OH) with a concentration of 1.1mol / L is charged into the stirred tank. 2 solution, mechanically stirred, the outer jacket of the reactor was passed into heat conduction oil to heat and control the temperature, and the temperature was controlled at 100°C; then, 450ml concentration of 2.0mol / L (NH 4 ) 2 SO 4 The solution (21.2wt%) is quickly poured into the reactor at one time, and the lime milk is kept in excess, and is uniformly mixed by mechanical stirring. After the reaction starts, samples are regularly taken to measure the pH value, calcium ion concentration and sulfate ion concentration of the solution, and the crystal form and particle size of the generated gypsum crystals are analyzed at the same time. During the reaction process, 50ml / min of nitrogen gas is blown into the liquid phase, and the generated ga...
Embodiment 2
[0040] The same as in Example 1, in a 2L stirred tank, the crystallization law of the mixed reaction of ammonium sulfate and milk of lime was experimentally investigated. The reaction temperature considered was also 100°C. The difference was the feeding method, and the milk of lime was added to sulfuric acid at one time under stirring conditions in ammonium solution. It is 2.0mol / L (NH 4 ) 2 SO 4 solution (21.2wt%), and then 900ml of Ca(OH) with a concentration of 1.1mol / L 2 The solution is quickly poured into the reactor at one time, and the milk of lime is kept in excess, and mechanical stirring is added to keep the mixture uniform, and 50ml / min of nitrogen gas is blown into the liquid phase at the same time. After reacting for 60 minutes, the ammonium ion concentration in the tail gas absorption bottle was sampled and analyzed, and the ammonia recovery rate calculated based on the added ammonium sulfate was 98.5wt%, indicating that the ammonia was basically completely re...
Embodiment 3
[0042] The same as in Example 1, in a 2L stirred tank, the crystallization law of the mixed reaction of ammonium sulfate and milk of lime was experimentally investigated. The difference was the reaction temperature and feeding method. The reaction temperature was 120 ° C. Under stirring conditions, the ammonium sulfate solution was pumped Continuously added to milk of lime. First put 900ml of Ca(OH) with a concentration of 1.1mol / L in a 2L stirred tank 2 solution, and then 450ml concentration of 2.0mol / L (NH 4 ) 2 SO 4 Solution (21.2wt%) was continuously added to the reactor at a flow rate of 50ml / min, and the ammonium sulfate solution was added in 9 minutes, mechanically stirred to keep mixing evenly, and nitrogen gas of 50ml / min was blown into the liquid phase simultaneously. The jacket of the reactor is heated and kept with heat conduction oil, and the temperature is controlled at 120°C. After reacting for 60 minutes, the ammonium ion concentration in the tail gas absor...
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