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Studies on the Synthesis of Aluminum Salt Lithium-Adsorbent and Its Adsorptive Property

Author: LiJie
Tutor: ZhongHui
School: Chengdu University of Technology
Course: Chemical processes
Keywords: Lithium-ion Adsorbent Adsorption Desorption Selective
CLC: TQ424.1
Type: Master's thesis
Year: 2011
Downloads: 38
Quote: 0
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Abstract


China is a salt lake brine lithium resources are very rich country, lithium is known as the \development of salt lake brine lithium resources is particularly important. Salt lake brine lithium ion concentration is low, coexist and are often associated with a variety of alkali metals, alkaline earth metal ions, making separation difficult to extract lithium from salt lake brine increased constraints of Salt Lake in industry, especially the development of the lithium salt industry. Aluminum salts lithium adsorbent selective for lithium-ion high adsorption capacity, environmentally friendly, and is considered the prospects for most industrial applications, the Salt Lake Brine lithium method. The main subject of the preparation process of the aluminum salts lithium adsorbent and its adsorption - desorption. The aluminum salt the lithium adsorbent Preparation Process, for the preparation of aluminum salts lithium adsorbent single complex process, this paper for the first time step synthesis of AFP process direct preparation of aluminum salts lithium adsorbent, and step through in-depth research synthesis Preparation of influencing factors, obtained a set of aluminum salts lithium adsorbent best preparation conditions. Single factor experiments show that: the feeding mode, the lithium ion concentration in the solution, the reaction temperature and stirred for aging time a greater impact on the performance of the adsorbent, In addition, the product drying temperature is also a very important factor. In the aluminum salts of lithium adsorbent adsorption - desorption, adsorption experiments showed that: lithium aluminum salts prepared adsorbents lithium ion adsorption rate soon, adsorption 30min adsorption capacity reached 5 mg / g, basically reached saturation adsorption, it is good solution has been adsorbed by the adsorbent rate slower defects. By measuring the distribution coefficient and selection coefficient of the aluminum salt of lithium adsorbent found that the lithium ion, the adsorbent having a good choice of the absorption, can be extracted from the solution containing lithium lithium. In addition, the article was first systematic study desorption properties of aluminum salts lithium adsorbent, the experimental results show that: the sorbent after the saturated adsorption first resolution rate of only 40 percent, but the cycle adsorption 3, the adsorption capacity can be maintained at about 2.3mg / g, has a certain value of industrial utilization. Finally, by X-ray diffraction of the samples proved synthetic adsorbent is the desired product, before the adsorbent in the adsorption after adsorption and desorption after its crystalline structure has not changed greatly, described the synthesis of an aluminum salt lithium adsorbent stable structure.

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Adsorbent > Activated carbon
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