| Customization: | Available |
|---|---|
| Color: | White |
| Appearance: | Liquid |
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| Item | Index |
| Appearance | Colorless or light yellow transparent liquid |
| PH (5% water solution) | 4.5-7.5 |
| Viscosity(25ºC) | ≤500mPa·s |
| Density(25ºC) | 0.95-1.05g/ml |
Red mud settling process for alumina production can break bubbles quickly,and can effectively inhibit foam growth Polyether defoamer
Red mud settling defoamer is a kind of chemical agent specially used to remove foam during red mud settling. Red mud is the waste produced in the process of alumina production, and its sedimentation separation is a complex physicochemical process. In this process, due to the interaction between the red mud particles and the solution, it is easy to produce foam, which affects the sedimentation efficiency and quality. Therefore, the use of defoamer can effectively reduce the foam generation, improve the sedimentation tank productivity and overflow quality.
The action mechanism of defoamer mainly includes destroying the surfactant molecules, making them lose their foam properties, so as to effectively reduce the generation of foam. In addition, defoamer can also improve treatment efficiency, protect equipment, and improve effluent quality. When selecting the defoamer, it should be selected according to the specific treatment situation and requirements to ensure the treatment effect and reduce the treatment cost.
1. Why do we need to use defoamer to prepare alumina by modified Bayer process?
First of all, we should understand the difference between the Bayer method and the improved Bayer method. The Bayer method is mainly to dissolve the ore with sodium hydroxide by heating, and then get the white alumina powder through the process of "filtration - acid treatment - aluminum hydroxide precipitation - filtration - strong hot aluminum hydroxide". The improved Bayer rule is to obtain high purity aluminate solution through deep desilication, iron removal and other purification processes, reduce the inclusion of impurities, and obtain alumina through calcination, grinding and other processes.
Due to the need for a lot of chemical reactions in the preparation process, coupled with the effect of external agitation, a large number of bubbles are easily produced in the alumina solution system, which has a certain impact on the dissolution rate and red mud yield of the system, so it is necessary to use alumina defoamer to control the foam in time and improve the production efficiency.
2. What are the specific characteristics of alumina defoamer?
Alumina defoamer is a kind of refined non-silicon emulsion defoamer, which is milky white or transparent liquid in appearance. It has strong defoamer and defoamer ability, and can withstand high temperature and high pressure and strong acid and alkali. Adding a small amount of alumina defoamer to the foaming system helps to make the alumina hydroxide better achieve crystal transformation at high temperature, maintain the balance of liquid amount in the circulation system, and evaporate and concentrate to meet the requirements of the Bayer method of dissolving bauxite to prepare the original pulp.
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