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New process for preventing refinery salt from caking

A refined salt and new process technology, applied in the field of refined salt production, can solve the problems of refined salt agglomeration, which is difficult to obtain the desired effect, and achieve the effects of fast dissolution, high moisture absorption capacity, and reduced contact points

Inactive Publication Date: 2004-12-15
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the agglomeration problem of refined salt is always difficult to obtain the desired effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Sodium ferrocyanide was added to the refined saturated brine, pH = 7, so that the concentration was 1.0 mg / L. Put it into a glass-made natural circulation evaporation crystallizer for evaporation and concentration. The capacity of the material liquid in the evaporation crystallizer is 10 liters, the evaporation intensity is 0.39 kg of water / hour·liter, and the pressure of the evaporation chamber of the evaporation crystallizer is 79.5KPa (vacuum degree). The liquid temperature is 68°C. When there is salt to separate out, start feeding continuously, discharge salt intermittently, feeding speed is 9 liters / hour, slurry concentration 8%. After dehalogenation, rinsing and drying, the discharged wet salt is refined salt with a sodium ferrocyanide content of 9.0 mg / kg in the crystal form of concave cubes and star-shaped dendrites, and the product volume density is 0.70 g / kg cubic centimeters.

Embodiment 2

[0011] Sodium ferrocyanide was added to the refined saturated brine, pH = 8, so that the concentration was 2.0 mg / L. Put it into a glass-made natural circulation evaporation crystallizer for evaporation and concentration. The capacity of the material liquid in the evaporation crystallizer is 10 liters, the evaporation intensity is 0.30 kg water / hour·liter, and the pressure of the evaporation chamber of the evaporation crystallizer is -10.4KPa (gauge pressure). The feed liquid temperature is 105°C. When there is salt to separate out, start to feed continuously, discharge salt intermittently, feed rate is 3 liters / hour, slurry concentration 7%. After dehalogenation, rinsing and drying, the discharged wet salt is refined salt with a sodium ferrocyanide content of 7.5 mg / kg in the crystal form of concave cubes and star-shaped dendrites, and the product volume density is 1.0 g / kg cubic centimeters.

Embodiment 3

[0013] Potassium ferrocyanide was added to the refined saturated brine, pH = 9, to make the concentration 3.0 mg / L. Put it into a steel forced circulation evaporation crystallizer for evaporation and concentration. The capacity of the material liquid in the evaporation crystallizer is 300 liters, the evaporation intensity is 0.4 tons of water / hour·cubic meter, and the pressure of the evaporation chamber of the evaporation crystallizer is 82.3KPa (vacuum degree). The feed liquid temperature is 67°C. When there is salt to separate out, start to feed continuously, discharge salt intermittently, feed speed is 80 liters / hour, slurry concentration 9%. After dehalogenation, rinsing and drying, the discharged wet salt is a refined salt product with a potassium ferrocyanide content of 7.6 mg / kg in the form of concave cubes and star-shaped dendrites, and the volume density of the product is 0.82 grams. / cubic centimeter.

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Abstract

The present invention relates to a new technological process of preventing refined salt from caking. Trace amount of potassium ferrocyanide is added into saturated refined salt solution of pH 7-9 to prepare material solution with potassium ferrocyanide content of 1.0-3.0 mg / L, and the solution is evaporated to concentrate in evaporating crystallizer in the evaporation strength of 0.2-0.4 kg water / hr.L while controlling the material slurry concentration in not higher than 10 vol%, so as to obtain refined salt without caking. The refined salt has potassium ferrocyanide content not higher than 10 mg / kg. The said process is obviously superior to traditional production process.

Description

technical field [0001] The invention relates to the technology for making table salt, in particular to the technology for making refined salt by artificial evaporation. Background technique [0002] Refined salt is an indispensable edible product in people's daily life, and it is also widely used in industry. Because refined salt contains very few impurities, it is especially suitable for some fine chemical industries. In the process of using a large amount of salt, the biggest difficulty is the problem of salt agglomeration. Agglomeration of sodium chloride crystals is an inherent property, which is mainly dependent on the humidity in the environment. Generally, salt absorbs moisture when the relative humidity is above 75%, and releases moisture when it is lower than 75%. This phenomenon is repeated continuously, and when it reaches a certain level, it begins to solidify. There are many factors affecting salt agglomeration. As far as the crystal product itself is concern...

Claims

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Application Information

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IPC IPC(8): A23L27/40B01D9/02
CPCB01D9/005B01D9/0018
Inventor 张家凯蔡荣华张凤友
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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