Sugar Plant’s Relation with Welding

Published on 01 September 2022
  • book5 min

Sugar is always looked at as something necessary in our diet, starting our day with a nice warm cup of tea to the dessert we have for dinner. India is the largest producer of sugarcane and the second-largest producer of sugar in the world. The Sugar Industry is involved in all two major sectors of India, from producing sugarcane in the field (Primary sector), to the processing plant (Secondary sector). The sugar industry provides employment to 2.86 lakh people of India and accounts for Rs.1250 crore of capital investment. The process of extracting sugar from sugarcane is divided into 5 steps which are as follows:

Juice Extraction: In this process, the juice is extracted through four or five stages (set of mills) in the milling process. According to that set of mills the system is called a 5-Milling Tandem or 4- Milling Tandem. The milling tandem hot water is used for maximum extraction of juice from the prepared cane. This hot water is also called imbibition water. The parts like crane grabs, cane leveler arms, cane loading spikes, fibrizer, cane cutting knives, scraper plate, and trash plate generally face the issues of wear and teeth wear where Lotherme 602, 603R, 611, and 605 can provide solution for the long run.

Defecation Process: The process of Defecation is used in the clarification process of raw sugar and also the Organic sugar manufacturing industry.

After extraction of the juice from sugar cane by milling or diffuser technology is subjected to a defecation process. This process can be defined as neutralizing the raw juice by adding lime (add in the form of milk of lime). This is the oldest & cheapest method of juice clarification, in this process, lime & heat are two basic agents. The lime and heat treatment forms a heavy precipitate of complex composition. It contains insoluble lime salts, coagulated albumin, and a varying proportion of fats, waxes and gums. Phosphoric acid is added to increase the P2O5  content of juice to 300 ppm. Then lime added to neutralize organic acids, besides insoluble tricalcium phosphate is also formed which occludes colloids & suspended impurities. Here the stainless steel condenser faces the issue of wear and Fab, which can be resolved by Lotherme 451, 510N and 703.

Evaporation: The clarified juice sent to evaporator bodies to increase its solid concentration. After evaporation, it is called syrup. In the process of evaporation, the concentration of clear juice is carried out until the percentage of solids has reached up to 60% 70% as per the requirement. This evaporation process is conducted under a system of multiple effect evaporators as per the view of

energy conservation.

Crystallization: The concentrated juice means the syrup is subjected to the process of crystallization. The crystallization process consists of the concentration of syrup and the formation of sugar crystals. This process is done by vacuum pans. Here the wear issue generally occurs for which Lotherme 451 gives a better solution.

Centrifuging and Drying: The massecuite from crystallizers is taken into centrifugal form for the separation of sugar crystals and molasses. The centrifugal machine in which crystals in the massecuite are separated by using centrifugal force from the surrounding molasses or syrup. After centrifuging, the raw sugar dying flowed by cooling on the hopper by blowing hot and cold air. Bagging temp is maintained near to room temperature to prevent caking of raw sugar. The raw sugar should be quickly moved to the refined sugar process as far as possible or otherwise to be stored in humid proof godown. In this last step issues like wear, friction can arise where Lotherme 457, 470M and 464 can provide instant solutions once applied. 

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