| Customization: | Available |
|---|---|
| Color: | White |
| Appearance: | Liquid |
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Defoamer for the preparation of alumina by modified Bayer process
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.
| 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 |
This product has good continuous bubble inhibition, High degassing efficiency, a full benefit.
1. The amount is small, the solid content is high, the defoaming speed is fast, in the decomposed alumina solution, only a small amount of defoaming agent is needed, and the defoaming time is less than 10 seconds.
2.The chemical properties are stable, not easy to react with organic matter, but not with the industrial production cycle and a large amount of consumption, can save a lot of energy.
3.Has a good anti-foaming effect, and under the premise of not reducing the decomposition rate, there is basically no effect on the product decomposition rate and quality, but also effectively improve the quality of alumina products, bauxite dissolution, red mud settling array, aluminate solution decomposition, mother liquid evaporation and other processes have no adverse effects.
4.In the alumina production process of concentrated aluminum alkali solution, hydrolysis will not occur, long-term contact will not affect their bubble inhibition. Moreover, while defoamer is defoamer, it will also improve the purity of the overflow liquid during the separation of red mud, increase the decomposition half of aluminate solution by 0.6%~3.1%, increase the sedimentation rate of pulp by 0.6~5.5 times, and accelerate the evaporation of mother liquor by 3%~10%.
-Excellent dispersion performance
-Excellent stability and compatibility
-The performance is obviously better than that of traditional polyether defoamer
-Excellent service and cheaper price.
Shanghai Guanru Chemical Co., Ltd. is a professional enterprise in the research, production and sales of defoaming agent The defoamer products developed and produced by the company are widely used in pulp and paper industry, textile print ing and dyeing industry, architectural coating industry, surface cleaning industry, chemical industry, petroleum industry, sewage treatment industry, etc. Quality is excellent, products are superior; supply is timely, and service is thoughtful! Is a professional defoamer manufacturer.
Supply "Excellent Quality + Reasonable Price + Specialized Services" is our development tenet. The company have scientific management, strong technology and sincerely service system. We welcome customers all over the world visit for business negotiation on the basic of sincerely cooperation and mutual benefit!
SHANGHAI GUANRU CHEMICAL CO., LTD.
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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