Method for producing industrial grade superior ammonium sulfate through coked coarse ammonium sulfate
A crude ammonium sulfate, industrial-grade technology, applied in the field of high-quality ammonium sulfate, can solve the problems of difficult sales, poor color and low product price, and achieve the effects of improving color grade, slowing growth rate, and reducing impurity content.
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Embodiment 1
[0030] A method for coking crude ammonium sulphate to produce industrial grade superior product ammonium sulphate, the concrete steps are:
[0031] Step 1. Under the conditions of normal pressure, 40~60°C and 300~400r / min rotation speed, first prepare a coking crude ammonium sulfate aqueous solution with a concentration of 40~45wt%; then use NaOH to adjust the pH of the coking crude ammonium sulfate solution to 7~ 8; then adding activated carbon accounting for 1-3wt% of the coking crude ammonium sulfate to the coking crude ammonium sulfate aqueous solution, insulated and stirred for 0.5-1h and then insulated and filtered to obtain the coking crude ammonium sulfate crystallization mother liquor;
[0032] Step 2. Under normal pressure, 40~60°C and 300~400r / min rotating speed conditions, first add an acid regulator to the coking crude ammonium sulfate crystallization mother liquor prepared in step 1 to make the mother liquor pH=5~6; Add a crystal habit modifier and seed crystals ...
Embodiment 2
[0037] Step 1. Under the conditions of normal pressure, 60~80°C and 350~450r / min, first prepare a coking crude ammonium sulfate aqueous solution with a concentration of 43~48wt%; then use NaOH to adjust the pH of the coking crude ammonium sulfate solution to 8~ 9; Then, add activated carbon accounting for 2-4wt% of the coking crude ammonium sulfate to the coking crude ammonium sulfate aqueous solution, heat-preserve and stir for 0.5-1h and then insulate and filter to obtain the coking crude ammonium sulfate crystallization mother liquor;
[0038] Step 2. Under normal pressure, 60-80°C and a rotating speed of 350-450r / min, first add an acid regulator to the coking crude ammonium sulfate crystallization mother liquor prepared in step 1 to make the mother liquor pH=6~7; Add a crystal habit modifier and seed crystals to the mother liquor, heat and stir to grow crystals for 15-30 minutes, and obtain a suspended crystal slurry;
[0039] Step 3. Under the conditions of vacuum degree ...
Embodiment 3
[0043]Step 1. Under the conditions of normal pressure, 80~100°C and 350~500r / min, first prepare a coking crude ammonium sulfate aqueous solution with a concentration of 45~50wt%; then use NaOH to adjust the pH of the coking crude ammonium sulfate solution to 7~ 9; Then, add activated carbon accounting for 3-5wt% of the coking crude ammonium sulfate to the coking crude ammonium sulfate aqueous solution, insulate and stir for 0.5-1h and then insulate and filter to obtain the coking crude ammonium sulfate crystallization mother liquor;
[0044] Step 2. Under normal pressure, 80-100°C and 350-500r / min rotating speed conditions, first add an acid regulator to the coking crude ammonium sulfate crystallization mother liquor prepared in step 1 to make the mother liquor pH=5~7; Add a crystal habit modifier and seed crystals to the mother liquor, heat and stir to grow crystals for 15-30 minutes, and obtain a suspended crystal slurry;
[0045] Step 3. Under normal pressure, 80-100°C and ...
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