Purification issues in wet zinc smelting
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Help: Our facility uses two-stage leaching and three-stage purification. Samples are taken every 2 hours for testing during the purification process, and samples are collected using a sampler and sent to the electrolysis workshop every 8 hours. Why is there always a difference in the Zn content between the results from the three-stage purification process and those of the samples sent to the electrolysis process? The former value is 10 g/l lower than the latter. Please advise: handshake
Please explain the sampling locations for the three stages of purification, the sampling location in the electrolysis workshop, and the heating method for purification.
Are you taking samples continuously or instantaneously?
Are you taking samples continuously or instantaneously?
Sampling location for three-stage purification: the outlet chute of the third stage. Location to which the purified liquid is sent for electrolysis sampling: during pumping to the chute in the electrolysis workshop, it passes through a continuous sampler; the purification is carried out using a spiral heater, and the cooling water is recycled back to the slurry tank. The liquid before being sent to the electrolysis workshop goes through a cooling tower.
My suggestions: 1. Look for the cause in the heating method; 2. Check the sample comparison time.
Could you explain the reason: handshake
There may be the following reasons: 1. Inconsistent sampling times. 2. Is there a problem with the analysis method? If separation is required before purification, losses will occur during separation. If no interference separation is performed after purification, the measurement results will be on the high side.
Suggestions: 1. Use the same sample for comparative analysis; by ensuring that the samples are identical, it is possible to assess the analytical errors as well as any operational mistakes made by the analysts. In short, this helps to ensure the accuracy of the analyses； 2. What type of pump should be used for the liquid delivery pump? If a water seal is used, it can easily dilute the zinc content in the solution ； 3. If you take samples continuously for 8 hours, how do you ensure that the moisture in the samples inside the sampler does not partially evaporate? 4. It’s normal for there to be differences between the front and back samples, but your error is a bit too large ； 5. The three-stage outlet chutes allow for instant sampling; do you still need to filter it before analysis? 6. After passing through the cooling tower, the volume decreases, and it’s possible that the concentration increases as well!
A high concentration indicates that water has evaporated; a low concentration means there is a leak in the heat exchanger or the temperature has dropped
A high concentration indicates that water has evaporated; a low concentration means there is a leak in the heat exchanger or the temperature has dropped