Preparation Of Emulsion-based Additives And Their Effects On The Precipitation Ratio Of Seed Precipitation From The Sodium Aluminate Liquor

Using additives to improve the precipitation ratio of sodium aluminate liquor is one of the most effective way to increase profits for alumina production enterprise.This article explores the synthesis of a silicon-carbon anionic surfactant, and uses silicone surfactant and other auxiliaries drugs to make a new type of emulsion-based additives, and compares the additives' effection on improving the precipitation ratio of sodium aluminate liquor with two other new types of emulsion-based additives.First of all, Using p-Bromotoluene as raw materials to synthesize an anion surfactant which contains Si-C bond in the chain backbone. During this process, the influence of solvent dose, time and temperature on the yield were reviewed, then the compound was test by IR and HNMR.Secondly, we confect nine emulsion-based additives of three types DL-A, DL-B and DL-C using anion surfactant and other materials.Thirdly, using the sodium aluminate liquor of Shandong Xinfa Huayu alumina production enterprise as material, we pick out the excellent additives, in the whole experiment, the additive DL-A1 and additive DL-B2 both show good performance.Fourthy, Finding out the best conditions on add time and add quantity for additive DL-A1 and additive DL-B2, and comparing their performance once more. The results show that the best add time is 30 hours after the start time, the best add quantity is 25 mg·L-1, and the additive DL-A1 is better than additive DL-B2. Under the best coditions, additive DL-A1 can increase the precipitation ratio above 1.5% steadily, and it also take good effect to the quality of aluminum hydroxide and alumina..Fifth, Changing the experimental conditions to investigate the relations between production conditions and the effect of additive DL-A1. Finally we do industry experiment with the additive DL-A1 in the first product line in Shandong Xinfa Huayu alumina production enterprise. The results show that the additive DL-A1 can increase the precipitation ratio above 2%, removing the uncertainty of industrial production, it could at least improve 1.5%. At the same time, the additive DL-A1 could improve the granularity of aluminum hydroxide and alumina, and it also has some effect on elimination of the bubble.