Low-carbon and low-sulphur syrup clarifying method

Abstract

The invention discloses a low-carbon and low-sulphur syrup clarifying method. In the method, lime cream is added in syrup until pH is 6.0-9.5 and is pump to a heater to be heated to 50-80 DEG C; then,the syrup flows into a progressive liming tank, and lime cream is added until pH is 10-11; a great amount of impurities are condensed and separated out; lime cream is added again, and the mixture ispumped into a carbonic acid saturator; carbon dioxide is sucked in to perform chemical reaction to form lime deposit, a great amount of impurities are adsorbed and removed and pH reaches 8-9; the obtained product enters a convective quick depressor to separate serum; then the serum is pumped into a sulphitation neutralizer to suck sulfur dioxide to neutralize to be 7.2-7.8; the mixture is sent into a desilter after secondary heating to 102-105 DEG C; after separating high-quality serum, the serum is sent to the following working procedures; mud juice obtained by above two precipitations is mixed to filter and separate to obtain serum and filter mud. The lime amount of the method of the invention is one quarter of that of a normal carbonic acid method, sulphur amount is about one quarter ofthat of the normal sulphurous acid method, white sugar quality is obviously higher than that of the sulphurous acid method, and amount of generated filter mud is far lower than that of the carbonic acid method; the generated filter mud can be used as fertilizer and has no pollution problem.

Description

technical field [0001] The invention relates to a method for clarifying sugar juice, in particular to a method for clarifying low-carbon and low-sulfur sugar juice. Background technique [0002] The current sugar factories (including cane sugar factories and beet sugar factories) produce white granulated sugar, and there are mainly two sugar juice clarification processes: carbonic acid method and sulfurous acid method. Both of these processes have been more than one hundred years old, and have become less and less suitable for the requirements of modern society: the carbonic acid method uses a large amount of lime (about 2% of the sugar juice amount), and produces a large amount of filter mud to pollute the environment, while the sulfurous acid method The quality of white sugar is not good enough, and will use a considerable amount of sulfur (about 0.1% of the amount of sugar juice). People have carried out research on these two processes for many years, and have also made ...

AI Technical Summary

Problems solved by technology

Both of these processes have been more than one hundred years old, and have become less and less suitable for the requirements of modern society: the carbonic acid method uses a large amount of lime (about 2% of the sugar juice amount), and produces a large amount of filter mud to pollute the environment, while the sulfurous acid method The quality of the white sugar is not good enough, and a considerable amount of sulfur (about 0.1% of the amount of sugar juice) is used

People have carried out research on these two processes for many years, and have made some partial improvements, but so far they have not been able to fundamentally reform these two processes and solve their existing problems.