The production of aluminum hydroxide as fire retardant method Shanghai xin chemical industry

it is well known that the purpose of the aluminum hydroxide is very wide, in addition to the production of aluminum salt and preparation of glass material, is used to make the biggest use of flame retardants. We then introduce aluminum hydroxide as fire retardant is how to produce.

aluminum hydroxide as fire retardant, at present there are many kinds of production methods.

the monohydrate bounding method

will be activated aluminum powder into the water, in situations where conditions permit, to react, aluminum hydroxide of final product is very fine white powder, this method can be used in the preparation of aluminum hydroxide powder below 80 nm in diameter.

two urea hydrolysis neutralization

the aluminum ash and sulfate made from aluminium sulfate solution reaction, purification after removing impurity to add urea, constantly stir heated made from aluminum hydroxide hydrolysis. After the surface treatments of aluminum hydroxide precipitation aluminum hydroxide flame retardant products.

three points method

in sodium aluminate solution with a certain particle size of aluminum hydroxide fine seeds, and then kind of points processing, filtering, washing can be finished.

four carbon points method

in the supersaturated sodium aluminate solution into carbon dioxide, and then decomposition processing, aluminum hydroxide crystal can be obtained. Five mechanical FenSuiFa

ordinary level of metallurgy of aluminium hydroxide washing, drying made with aluminum hydroxide micro powder. This kind of method to produce aluminum hydroxide performance is poorer, flame retardant effect is poor.

six sodium aluminate method

caustic soda and aluminum ash according to 2:1 unregular, sodium aluminate solution with sulfuric acid and aluminum ash according to 1. Made from aluminium sulfate solution, and its mixture, PH dropped to 6. Five or so, the production of aluminum hydroxide precipitation, washing, dry processing to get flame retardant products.

industry above, generally made flame retardant aluminum acid salt solution, but the finished product grain is bigger, affect the flame retardant effect. In a word, a variety of methods have their own advantages and disadvantages, will focus on methods to mix use will be a better choice.