Clarification method for sugarcane juice

Abstract

The invention discloses a clarification method for cane expressed juice, which is an improvement for sulfurous acid method manufacturing technique of a cane sugar factory. The cane juice is conveyed into a reactor after the first heating, and carbonation is performed through adding lime and carbon dioxide; solid-liquid separation can be performed to the carbonation cane juice to remove solid impurity, and the stoving liming neutralization treatment is performed to the obtained clear juice taking sulfur dioxide and lime as clarificant; the stoving liming neutralization treatment can be also performed to the turbid carbonation cane juice directly taking sulfur dioxide and lime as clarificant. The stoving liming neutralization cane juice is conveyed into a settler after the second heating, and the clear juice and the mud juice are separated. The clarification method has the advantages that the brenstone use level is reduced, the production cost is saved, the sulfur dioxide residual in white sugar is decreased greatly, the product quality is improved, the carbon dioxide discharge amount is reduced, the clear juice purity is increased by 1 to 1.5, the white granulated sugar color value is reduced by twenty percent, and therefore the environment problem does not exist.

Description

technical field [0001] The invention belongs to a sugar production method using sugarcane as a raw material, in particular to a clarification method for pressed sugarcane juice. Background technique [0002] There are three commonly used methods for sugar clarification process using sugarcane as raw material: [0003] 1. Lime method: the sugarcane juice clarification method uses lime as the main clarifier. The process plan is to add lime to the mixed juice to adjust the pH value to 7.8-8.3, then heat it to 101-105°C, and send it to a settler for clarification. The mud juice is sent to the filter press to filter to obtain the filtered mud and clear juice, and the clear juice is sent to the evaporation tank for concentration, and finally the raw sugar is crystallized. This process is relatively simple, but the clarification effect is poor, and it can only be used to produce raw sugar, not white granulated sugar. [0004] 2. Carbonation method: a clarification method with lim...

AI Technical Summary

Problems solved by technology

In the past, because the market had lower requirements on the color index of white sugar, most sugar factories controlled the intensity of sulfur fumigation between 18 and 20. With the implementation of the "White Sugar GB317-2006" standard, the standard for the color value of the first-grade white sugar was changed from the original 170IU Increased to 150IU, in order to ensure that the color value of white sugar meets the standard, most sugar factories are forced to increase the intensity of sulfur fumigation to 20-24, thus increasing the amount of sulfur, increasing the cost of sugar production, and also increasing the risk of excessive sulfur dioxide residue

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