Background and overview[1][2]
Strontium oxalate, white crystalline powder. Relative density 2.08. Loss of crystal water at 150°C. Strontium oxalate Strontium oxalate, relative density 2.08, Chinese alias strontium oxalate. The foreign name is Strontium oxalate and the molecular formula is SrC2O4. Insoluble in cold water, easily soluble in dilute hydrochloric acid or nitric acid. It is produced by the interaction of aqueous solutions of soluble oxalate and strontium salts during boiling. Used for making fireworks, catalysts, and tanning leather.
Strontium is an important trace element necessary for the human body. It is vital to the human body, just like the reinforced concrete used to build the human body. It is an important component of human bones and teeth. Strontium deficiency can easily cause fractures that are difficult to heal, gray hair, dental caries, and senile osteoporosis. Strontium also participates in human blood circulation, can improve the absorption and metabolism of sodium salts in the body, and prevent hypertension and cardiovascular diseases.
In addition, strontium salts are also related to the excitement of nerves and muscles. Various strontium-containing compounds have been used clinically to treat urticaria and convulsions caused by thyroid insufficiency. Because strontium salts can seal dentinal tubules and prevent the flow of liquid in the tubules, strontium salts are often used in toothpaste to play an anti-sensitivity role. Health care therapies include oral administration of strontium bromide, strontium oxalate, strontium iodide, strontium lactate, and strontium salicylate.
Strontium oxalate
Apply[3]
1. Preparation of niobate-doped strontium titanate thin film
a. Preparation of niobium-citric acid ethylene glycol solution: Place niobium oxide in hydrofluoric acid and stir at 80°C to fully dissolve it to form a niobium oxide solution. Add ammonia solution dropwise to the solution to form white niobium hydroxide. The precipitate is aged for 4 hours; after filtration, the precipitate is washed with 3% dilute ammonia water, dehydrated and dried in a vacuum; the dried precipitate is dissolved in an ethylene glycol solution of citric acid at 60°C and fully Stir to obtain niobium-citric acid ethylene glycol solution.
b. Preparation of niobium-doped strontium titanate precursor solution: molar ratio Sr2+:Ti4+:Nb5+=1:0.95:0.05. Measure strontium oxalate, butyl titanate and niobium-citric acid prepared in step a respectively. Ethylene glycol solution; dissolve strontium oxalate in acetic acid to form solution A; add acetylacetone in an equimolar amount to Ti4+ into butyl titanate first, and then add ethylene glycol methyl ether solvent to form solution B; solution A, After B is mixed, stir evenly, then add niobium-citric acid ethylene glycol solution and stir evenly to form a mixed solution; add ethylene glycol and glycerol to the mixed solution according to the mass ratio of ethylene glycol and glycerol 4:1. , adjust the solution concentration to 0.25 mol/L, and stir evenly to form a precursor solution of strontium niobate-doped titanate;
c. Thermal decomposition and sintering: The niobate-doped strontium titanate precursor liquid of step b is coated on the substrate, and after thermal decomposition treatment, sintering phase formation treatment is performed. The specific method is as follows: when coating, apply the precursor solution of strontium niobate-doped titanate on the substrate, rotate it with a glue uniformizer, the glue uniform speed is 5000r/min, and the glue uniform time is 10s to form a gel film; then perform thermal decomposition treatment , place the substrate coated with colloid in a sintering furnace, slowly raise the furnace temperature from room temperature to 180°C, dry it for 10 minutes to form a solid film, and heat it to 450°C at a rate of 1°C/min, and keep it for 10 minutes to form. Inorganic film; finally, the sintering phase treatment is performed, the furnace temperature is raised to 750℃ at a rate of 4℃/min, and kept for 20min, and then the furnace temperature is lowered to room temperature, that is, strontium niobate titanate SrTi0.95Nb0 is formed on the substrate. 05O3 film.
2. Preparation of strontium supplement health products
Carefully mix 3000g strontium oxalate and 170g microcrystalline cellulose. The mixture was sieved and 120 g of povidone and purified water were added (to obtain uniform granules – approximately 375 g). The granules are sieved, dried at 40°C for 2.5 to 3 hours, and then sieved again.
25g of anhydrous colloidal silica and 265g of microcrystalline cellulose were carefully mixed and sieved before being added to the previously prepared granules and the complex of Example 1.
Add 300 g of the resulting mixture to 25 g of sieved magnesium stearate, then when a homogeneous mixture is obtained, add the remaining mixture. The final mixture is pressed.
Main reference materials
[1] Tang Hua, (2005). Biomimetic synthesis and morphology control of oxalate materials. (Doctoral dissertation, Wuhan University of Technology).
[2] Li Yijiu, & Liu Yafei. (1998). Research on the separation and purification of high-purity strontium oxide. Inorganic saltsIndustry(6), 8-9.
[3] Cheng Qingtang, Xi Guoxi, & Li Jinghua. (1992). Thermogravimetric study of the mechanism and kinetics of the dehydration process of strontium oxalate monohydrate. Journal of Henan Normal University: Natural Science Edition.
微信扫一扫打赏
