Preprocessor anti-blur
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This post was last edited by sunjl1981 on 2013-1-6 23:00. What causes preprocessing anti-obfuscation? # ， ， &
Magnesium hydroxide has a poor sedimentation effect, and there are many reasons for this phenomenon; the specific causes should be analyzed based on the actual situation.
Precursor processor turbidity recurrence phenomenon and treatment Sequence Number Cause of turbidity Treatment measures 1 Low pressure in the dissolving tank Adjust the air pressure supplied to the tank or request the air compressor station to increase it 2 Liquid level in the dissolving tank is too high or too low Adjust the inlet and outlet valves of the dissolving tank to control the liquid level 3 Excessive or insufficient amount of ferric chloride solution added Adjust the flow rate of ferric chloride to maintain an appropriate level 4 Unstable or excessively high temperature of the brine, affecting the dissolution capacity Maintain the brine temperature at (55±2) 5 Unstable brine flow rate Keep the flow rate within 5 cubic meters per hour 6 Unstable brine concentration Control the interval between salt additions 7 Delayed sludge removal Carry out timely upper and lower sludge removal 8 Poor quality of raw salt 9 Excessive salt sludge in the precursor processor Clean the salt dissolving tanks and the precursor processor promptly
①① Unstable NaCl content in brine. ② Unstable NaOH content in brine. ③ Excessively high Na2CO3 content before pretreatment. ④ Large fluctuations in brine temperature. ⑤ Large fluctuations in brine flow rate. ⑥ Insufficient dissolved air in the brine. ⑦ Delayed sludge removal. ⑧ Incorrect sequence of sludge removal. ⑨ Poor quality of raw salt. ⑩ Insufficient or excessive amount of FeCl3 added
All of the above conditions can cause the pre-treatment solution to become turbid. Another factor that leads to turbidity is when the pH value of the brine is greater than 12. This post was last edited by limingshuguang on 2007-12-24 at 11:06
Indeed, all of the above conditions can cause the preprocessor to become unstable, but in most cases it is a matter of improper operation; with a bit of care, the problem can generally be resolved. I think the main reason is likely an issue with the quality of the raw salt, as its magnesium content is too high.
What the original poster mentioned above is all correct; another point is that the ratio of calcium to magnesium ions in the brine fed into the pretreater is extremely important.