| Customization: | Available |
|---|---|
| Color: | White |
| Appearance: | Liquid |
Suppliers with verified business licenses
Audited Supplier Audited by an independent third-party inspection agency
| 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 |
Alumina production using defoamer, high efficiency and environmental protection
Bauxite is mainly hydroduralumite, this ore has a high silicon content, and in order to improve the content of alumina, flotation agents are generally added in the flotation process, resulting in a large amount of organic matter enrichment, which has surface active substances, will cause the decomposition slurry in the decomposition process a large number of bubbles, thus seriously affecting the yield and quality of alumina. Therefore, the addition of alumina defoamer in the decomposition section has become an essential link in the production process.
If the Bayer method is used to produce alumina in the factory, there will be a large number of bubbles in the ore slurry, so that the decomposition rate of sodium aluminate solution is low, weaken the efficiency of the evaporator, resulting in an increase in the content of sodium carbonate in the solution, reduce the flow of materials, and affect the coordination of the production unit. Because the aluminum alkali solution in the production process of alumina has a strong alkalinity and a high temperature, the defoamer selected should have chemical stability and non-volatile to the strong alkaline medium.
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.
){kind=link}