A method for refining thiocyanate by combined membrane method
A thiocyanate and combined membrane technology, applied in thiocyanate and other directions, can solve problems such as affecting the use effect of downstream users, affecting product purity, appearance, etc., to achieve easy intelligent control and automatic operation, and realize intelligent control and automatic operation. , versatility and applicability
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Embodiment 1
[0026] 1. The ammonium thiocyanate provided by a certain company is off-white in appearance, with a content of 96.5%, of which ammonium sulfate content is 2.3%. 500 kg of this product was dissolved with 500 liters of deionized water to obtain a nearly colorless aqueous solution. After testing, the ammonium thiocyanate content in the solution was 48.5%, and the ammonium sulfate content was 1.1%.
[0027] 2. Filter the above solution through a plate and frame filter press with a 0.27 micron microfiltration membrane to remove suspended particles.
[0028] 3. The above-mentioned permeate is further treated with an ultrafiltration membrane to remove finer impurity particles and macromolecule dissolved substances. The filtrate is clear and transparent, which meets the water inlet standard of nanofiltration operation. The process conditions of the ultrafiltration treatment are: the ultrafiltration membrane adopts hollow fiber ultrafiltration membrane or other ultrafiltration membra...
Embodiment 2
[0035] 1. The ammonium thiocyanate provided by a certain company has a dark green appearance and a content of 75%, including 20% ammonium sulfate and 3% ammonium thiosulfate. Add 200 liters of deionized water to 500 kg of this product and raise the temperature to 70°C to dissolve as much solid as possible. After being cooled to room temperature, filter to obtain 100 kg of dark green crystals containing ammonium sulfate and ammonium thiosulfate and 600 kg of dark green filtrate. Add 3 kilograms of gacs in the filtrate and carry out decolorization operation, obtain 600 kilograms of light green filtrates, after testing, composition is as follows, ammonium thiocyanate 62%, ammonium sulfate 4%, ammonium thiosulfate 2.5%. Add 100 kilograms of deionized water to dilute the above-mentioned filtrate to obtain 700 kilograms of solution, the composition is as follows: ammonium thiocyanate 52%, ammonium sulfate 3%, ammonium thiosulfate 2%.
[0036] 2, above-mentioned solution is carrie...
Embodiment 3
[0038] 1. The sodium thiocyanate provided by a certain company has an off-white appearance and a content of 95.7%, including 2.1% sodium sulfate and 0.9% sodium thiosulfate. 500 kg of this product was dissolved with 500 liters of deionized water to obtain a nearly colorless aqueous solution. After testing, the sodium thiocyanate content in the solution was 48.0%, the sodium sulfate content was 1.1%, and the sodium thiosulfate content was 0.6%.
[0039] 2, above-mentioned solution is carried out combined membrane refining operation according to 2-6 of embodiment 1, can obtain the sodium thiocyanate solution or sodium thiocyanate crystal that removes divalent anion salt, nanofiltration concentrated solution can be according to embodiment 1 7-8 for reuse operation.
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