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Sugar juice air-float clearing method

A clean and air flotation technology, applied in the purification of sugar juice, sugar production, sucrose production, etc., can solve the problems that hinder the implementation and promotion of low-temperature phosphorus flotation technology, affect the decolorization effect of flotation, and the unsatisfactory foam making effect, etc., to achieve It is not easy to accumulate fermentation, reduce the intensity of sulfur fumigation, and ensure the quality of finished sugar

Inactive Publication Date: 2008-10-29
GUANGXI NANNING HUAXIN SUGAR IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still the following problems in the implementation of the "low temperature phosphorus flotation method", which hinder the implementation and promotion of low temperature phosphorus flotation technology: 1. Cane juice is very easy to ferment at low temperature, and the accumulation of sediment at the bottom of the traditional floater will aggravate the problem. negative effect
2. Low temperature scum has high viscosity and is extremely difficult to filter
Therefore, it is still a good choice to use carbon-phosphorus combination and floating separation to clean the high-concentration syrup, but there are problems: 1. After the syrup is full, it is difficult to float the calcium carbonate and calcium phosphate in one float. The slag layer, the floating syrup is easy to turbid
2. The scum has a high viscosity and is difficult to filter, requiring multiple treatments
3 The foam making effect of the traditional bubble maker is not ideal, which part of the non-sugar flocs that are smaller than the bubbles is difficult to be lifted and floated by the bubbles, so the removal of impurities and the decolorization rate are low
4. Due to the accumulation of sediment in the traditional floater, the longer the floatation system runs, the lower the decolorization rate
5. In the process of air flotation separation and cleaning treatment of syrup, there is also a phenomenon: under the condition of oxygen-enriched syrup, the flocs formed after adding flocculant are small and few, which affects the floating and decolorizing effect. The specific reason is unknown

Method used

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  • Sugar juice air-float clearing method

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1, to the floating processing method of mixed juice, its flow process is as follows:

[0026] Add phosphoric acid (50-150PPM) and lime milk to the mixed juice, control the pH value at 6.8-7.8, and heat it (50-65°C) before entering the sulfur fumigation tower; add a small amount of sulfur dioxide, carbon dioxide and lime to the sulfur fumigation tower Milk, carry out a mild sulfur fumigation neutralization and mild carbon dioxide saturation (PH value is controlled at 7.2-7.8, sulfur fumigation intensity is controlled at 5-8); most of the mixed juice after the first sulfur fumigation neutralization directly enters the floater Others (10-30%) are added polyaluminum chloride (10-20PPM) and then enter the bubble maker with more than 99% nitrogen as the gas source, and then enter the mixing tube; add flocculant ( 1-3PPM), and then the mixed juice in the mixing tube is sent to the floating device for separation treatment, and the floating clear juice with lower colo...

Embodiment 2

[0027] Embodiment 2, to the floating processing method of neutralizing juice, its flow process is as follows:

[0028]Most of the neutralized juice from the neutralizer is directly sent to the mixing tube of the floater, and the rest (10-30%) is added to polyaluminum chloride (10-20PPM) and then enters the system with more than 99% nitrogen as the gas source. Then enter the mixing tube; add cationic flocculant (1-3PPM) into the mixing tube, and then send the neutralized juice in the mixing tube to the floater for separation treatment, so as to obtain the floating clear juice with lower color value. The floating clear juice is pre-ashed twice to adjust the pH value to 7.0-7.3 by adding phosphoric acid, and then enters the original process of the next sugar factory; the scum is added with part of cane bran, and after heating, it is mixed with the sludge in the sedimentation tank and sent to the suction filter for filtration.

Embodiment 3

[0029] Embodiment 3, to the floating processing method of clear juice of sedimentation tank, its flow process is as follows:

[0030] In the clear juice of the slightly alkaline sedimentation tank (PH7.3-8.0), add phosphoric acid to adjust the pH value to 7.0-7.2, and then most of them directly enter the mixing tube of the floater, and add polyaluminium chloride to the others (10-30%) (5-20PPM) and then enter the bubble maker with more than 99% nitrogen as the gas source, and send it into the mixing tube; add flocculant (1-3PPM) into the mixing tube, and then send the clear juice of the sedimentation tank in the mixing tube into the floating Separation treatment by the device can obtain the supernatant juice with lower color value. The floating clear juice enters the original process of the next sugar factory; the floating slag is added with part of cane bran, mixed with the sludge in the sedimentation tank and sent to the suction filter for filtration.

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PUM

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Abstract

The invention discloses an air floatation lustration method of sugar juice. Nitrogen is used as foaming air supply instead of air; thin juice (such as mixed juice, diffusion juice, neutral juice, clear juice and filtered juice) and concentrated sugar juice (such as syrup and molasses) in a sugar-refinery are processed through floatation lustration. The lustration method solves the problems that oxygen generated in the air floatation lustration method which takes the air as the foaming air supply has the oxidation encolouration side effects on the phenols in the sugar juice, the intensity of sulfitation is reduced, the sugar juice is fermented under the low temperature, etc., the sugar juice with better quality is obtained, and the product quality of the sugar-refinery is increased.

Description

technical field [0001] The invention relates to a method for cleaning sugar juice by air flotation in a sugar factory. Background technique [0002] At present, in the floating and cleaning process of various sugar juices (including mixed juice, exuded juice, neutralized juice, clear juice, filtered juice, evaporated syrup, redissolved syrup or molasses) in sugar factories, air is used as the air source to produce micro bubble. Therefore, a large amount of oxygen is charged in the sugar juice. Oxygen promotes the oxidative browning of phenolic substances in sugar juice, and the resulting color enhancement partly offsets the effect of flotation to remove pigment; in addition, oxygen promotes the large-scale reproduction of aerobic bacteria in low-temperature sugar juice, which is One of the reasons why the traditional sugar juice floating cleaning process is prone to sugar juice fermentation, sugar conversion and scum difficult to filter. [0003] In 2001, my country pione...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13D3/00C13B20/00
Inventor 韦武林谭家杰
Owner GUANGXI NANNING HUAXIN SUGAR IND TECH
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