System and method for cleaner production of magnesium hydroxide
A magnesium hydroxide and clean production technology, applied in the direction of magnesium hydroxide, etc., can solve the problems of low utilization rate of raw materials and environmental pollution, and achieve the effects of easy automatic control, reduced equipment volume and investment, and less water content
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Embodiment 1
[0018] Such as figure 1 As shown, this embodiment provides a system 100 for clean production of magnesium hydroxide, including a reactor 110 , a first filter 120 , a distiller 130 , a concentration device 140 and a second filter 150 .
[0019] Specifically, the reactor 110 includes a first material inlet 111 and a first material outlet 112; the first filter 120 includes a second material inlet 121 and a second material outlet 122; the distiller 130 includes a distillation outlet 131 and a second outlet 122; Three material outlets 132; the concentration device 140 includes a fourth material inlet 141 and a fourth material outlet 142; the second filtering device includes a fifth material inlet 151 and a fifth material outlet 152.
[0020] The first material inlet 111 is a material inlet for raw materials. The first material outlet 112 is connected to the second material inlet 121 , that is, the raw material will enter the first filter 120 after the reaction in the reactor 110 ....
Embodiment 2
[0033] Different from Example 1, a kind of method for the clean production of magnesium hydroxide provided by the present embodiment is:
[0034] Prepare bischofite into a 2mol / L solution, turn on the magnesium chloride feed pump and control the flow rate, and at the same time turn on gaseous ammonia and recover ammonia for reaction, control the pH of the reaction system at 9.3-10.0, the reaction temperature is 60±5°C, and the residence time is 3~4min. The material leaving the reactor 110 enters the buffer tank, and then enters the plate and frame filter press for filtration, and separates each mother liquor and magnesium hydroxide filter cake.
[0035] The still temperature of the distillation tower is controlled at 110±2°C, the temperature at the top of the tower is controlled at 50±10°C, and the recovered ammonia is reused at the inlet of the reactor 110. The insufficient part is replenished by the evaporation of liquid ammonia evaporator.
[0036] The second mother liquo...
Embodiment 3
[0040] Different from Example 1, a kind of method for the clean production of magnesium hydroxide provided by the present embodiment is:
[0041] The reaction kettle first prepares the bottom liquid and heats up to the reaction temperature. Prepare bischofite into a 4mol / L solution, turn on the magnesium chloride feed pump and control the flow rate, and at the same time turn on gaseous ammonia and recover ammonia for reaction, control the pH of the reaction system at 9.3-10.0, the reaction temperature is 65±5°C, and the residence time is 60min. The raw materials leaving the reactor 110 enter the three-in-one filter for filtration and washing to obtain magnesium hydroxide filter cake and the first mother liquor.
[0042] The temperature of the distillation tower is controlled at 110±2°C, and the temperature at the top of the tower is controlled at 70±10°C. The recovered ammonia is mixed with the ammonia from the liquid ammonia evaporator and then enters the reaction kettle.
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