Method for reclaiming bleaching lac particles
A technology for bleaching shellac and a recovery method, which is applied in the field of recovering shellac particles, can solve the problems such as the inability to increase the mesh number of the filtering wire without limit, increase the investment in fixed assets and the floor space, and reduce the filtering efficiency, and the method is simple to achieve. Fast, resource-saving, high-yield and production-efficiency effects
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Embodiment 1
[0042] 1) The waste liquid collected in the buffer tank is transported through the heat exchanger by means of a high-level difference, and the waste liquid continuously flows into the clarification tank, and the heating temperature of the waste liquid is controlled between 45 and 50°C. In the liquid, the bleached shellac particles are heated and softened, and under the action of thermal movement, they coalesce into larger particles in the clarification tank, accelerating the sedimentation and separation of the particles and the liquid;
[0043] The heat exchanger used in this embodiment is a casing heat exchanger using hot water as a heat source. In addition, jacketed heat exchangers, tube heat exchangers, plate heat exchangers, spiral plate heat exchangers, submerged heat exchangers or volumetric heat exchangers can also be used. The heat source used in the heat exchanger to remove hot water In addition, it can also be steam, or heat carrier oil.
[0044] 2) After settling f...
Embodiment 2
[0051] 1) With the waste liquid collected in the buffer tank, the waste liquid of the same amount as in Example 1 is transported into the clarification tank by means of a pump, and the waste liquid in the clarification tank is directly heated by an electric heating rod (resistance assembly). When the temperature reaches 55 At ~60°C, stop heating.
[0052] In the heated waste liquid, the bleached shellac particles are heated and softened, and under the action of thermal motion, they coalesce into larger particles in the clarification tank, which accelerates the sedimentation and separation of the particles and the liquid.
[0053] 2) After settling for 20 minutes, collect the dense phase at the bottom outlet of the clarification tank and enter the centrifuge for further dehydration to obtain wet bleached shellac particles. The supernatant of the clarification tank is filtered and sent to the sewage treatment station.
[0054] According to the above method, 10m 3 The average am...
Embodiment 3
[0060] 1) With the waste liquid collected in the buffer tank, rely on the pump to transport the same amount of waste liquid as in Example 1 through the casing heat exchanger to heat the waste liquid, and control the heating temperature of the waste liquid containing bleached shellac particles at 45 ~ 50°C, and then send the heated waste liquid into the hydrocyclone to separate the larger bleached shellac particles in the waste liquid;
[0061] 2) Send the waste liquid treated by the hydrocyclone into the clarification tank for static settlement;
[0062] 3) After settling for 20 minutes, collect the dense phase at the bottom outlet of the clarification tank, and make it enter the centrifuge for further dehydration to obtain wet bleached shellac particles; filter the supernatant of the clarification tank and send it to the sewage treatment station.
[0063] According to the above method, 10m 3 The average amount of bleached shellac particles (dry) recovered from the waste liqu...
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Abstract
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