Potassium nitrate

About: Potassium nitrate is a research topic. Over the lifetime, 3537 publications have been published within this topic receiving 29450 citations. The topic is also known as: Nitric acid, potassium salt & Saltpeter.

Thermal processing technology for bolts

Abstract: A disclosed thermal processing technology for bolts comprises the following steps: 1) pre-heating to-be-processed bolts for 4-5 h, pre-heating a furnace to a temperature of 360-370 DEG C; 2) performing carburization processing; 3) keeping the bolts in a salt bath furnace with a temperature of 600-620 DEG C for 5-6 h and quenching; 4) performing first-stage quenching, employing a nitrate quenching agent and quenching to 500-510 DEG C with a constant velocity of 50-55 DEG C/min, wherein the nitrate quenching agent is a quenching agent prepared by mixing potassium nitrate and sodium nitrate with a mass ratio of 2:1; 5) performing second-state quenching, employing a nitrate quenching agent and quenching to 100-110 DEG C, wherein the nitrate quenching agent is a quenching agent prepared by mixing potassium nitrate and sodium nitrate with a mass ratio of 1:2; 6) performing third-stage quenching, employing hot water with a temperature of 200-205 DEG C and quenching to 230-235 DEG C; and 7) keeping the bolts in a tempering furnace with a temperature of 300-305 DEG C for 8-10 h, and cooling in air to room temperature. By employing the thermal processing technology for the bolts, the prepared bolts are small in cross-section shrinkage, improved in match rate and reduced in rejection rate, and cyanide penetrating agents harmful to human body and environment are avoided.

Special-purpose tuanke foliage fertilizer for flue-cured tobacco

Abstract: The present invention is spherical plant foliar fertilizer especially used for flue-cured tobacco, which is basically composed of the following substances: fulvic acid, zinc sulfate, copper sulfate, ferrous sulfate, boric acid, potassium dihydrogen phosphate, potassium nitrate, rooting powder, ammonium molybdate and acetic acid. Wherein, the ferrous sulfate refers to the ferrous sulfate heptahydrate; the copper sulfate refers to the copper sulphate pentahydrate; the zinc sulfate refers to the zinc sulfate heptahydrate; the acetic acid refers to the acetic acid glacial; the ammonium molybdate and the boric acid are without crystal water. The production method of the foliar fertilizer is as follows: first, a certain amount of 36% acetic acid is added to the mixture of the 25 g / L fulvic acid, followed by zinc sulfate, copper sulfate, ferrous sulfate, boric acid, potassium dihydrogen phosphate and potassium nitrate in sequence, and then 0.1% alcohol containing 5g/L rooting powder is also added to the 25 g / L fulvic acid; then, upon ongoing stirring, 145g/L ammonium molybdate is slowly added to the mixture of the 25 g / L fulvic acid; the mixture is then shaken up and filled into a glass or plastic bottle(do not use metal containers), and then the bottle is sealed, and the spherical plant foliar fertilizer is thus obtained. Compared with the similar foliar fertilizer, the foliar fertilizer provided by the invention can significantly promote the growth and development in tobacco plant resettling period and budding period, markedly increase the yield and value of flue-cured tobacco, significantly increase potassium content of flue-cured tobacco and reduce chlorine content to enable more moderate nicotine content and coordinated chemical composition of tobacco leaves. Therefore, the invention has significant economic and social benefits.

Effect of 10% Strontium Chloride and 5% Potassium Nitrate with Fluoride on Bleached Bovine Enamel.

Abstract: Background Dental whitening has been increasingly sought out to improve dental aesthetics, but may cause chemical and morphological changes in dental enamel surfaces. Objective This study evaluated in vitro the effect of 10% strontium chloride and 5% potassium nitrate with fluoride on bovine enamel, through tristimulus colorimetry, Knoop microhardness (KHN), and roughness after bleaching with 35% hydrogen peroxide (HP). Methods The specimens were divided into three groups (n=15): GControl received bleaching treatment with 35% HP; GNitrate received bleaching with 35% HP followed by the application of 5% potassium nitrate with 2% sodium fluoride; and GStrontium received bleaching with 35% HP followed by the application of 10% strontium chloride on the enamel. Next, five specimens of each experimental group were subjected to KHN and tristimulus colorimetry tests, and 10 specimens were subjected to surface roughness (SR) tests. The values obtained for the different groups were compared through analysis of variance (ANOVA) followed by a post-hoc Tukey-Kramer test in addition to Student's T-test for paired data. Results In the intergroup comparison, KHN final differed statistically (p 0.05). Conclusion 10% strontium chloride and 5% potassium nitrate combined with 2% fluoride downplayed morphological changes to the enamel, without interfering with the effectiveness of the bleaching process.

Effects of foliar potassium nitrate and calcium nitrate application on nutrient content and fruit quality of fig

Abstract: The research work is carried out to investigate the effects of foliar potassium and calcium nitrate applications on nutrient content and fruit quality of figs. The trial was performed as three replications on Sanlop trees, the main cultivar for commercial drying. The foliar fertilisation was made twice on July 10 and 25, 1997, and the program was carried out as potassium nitrate at 3.0 % level, calcium nitrate at 1.5 and 3.0 % levels and a combined application of 2.0 % potassium nitrate and 2.0 % calcium nitrate. The results put forth an increase of K and Ca contents of leaf lamina and petiole. Applications exerted marked effect on fruit width, length, shape and width of the ostiolar opening. Similar consequences appeared on texture and sugar fractions as fructose, α-glucose, β-glucose and galactose of dried fruits.