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The preparation process includes the following steps: dissolving activator and RE oxide in the molar ratio of 0.01-0.02 in concentrated nitric acid and heating to dry, dissolving the obtain RE nitrate in deionized water to obtain solution of RE nitrate; dissolving soluble tungstate and surfactant in deionized water to obtain tungstate solution; mixing the RE nitrate solution and the tungstate solution through stirring to reaction for 25-60 min to obtain white precipitate; hydrothermal reaction of the precipitate in a reaction kettle at 100-260 deg.c for 24-72 hr; centrifugally separating, washing and drying to obtain the product.
浓硝酸的加入量保证稀土氧化物溶解就可以,过量的硝酸可以加热除去;将可溶性钨酸盐和表面活性剂溶解于去离子水中,得到钨酸盐溶液,表面活剂性的加入量为反应原料重量的0-30wt%;将稀土硝酸盐溶液加入到钨酸盐溶液中搅拌,发生沉淀反应,磁力搅拌时间为25-60分钟,得到白色沉淀;将含有沉淀物的溶液作为前驱物加入到反应釜中,发生水热反应,反应温度为100-260℃,反应时间为24~72小时;离心分离,洗涤,干燥,即得所需产物。
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Through the dynamic simulation test of the indoor autoclave, the law of the influence of oxygen content, drill fluid temperature, drill fluid flow velocity and the salt concentration of the drill fluid on the oxygen corrosion rate of the S135 drill pipe steel was studied separately in order to investigate the relatio...
为研究腐蚀因素与腐蚀速率的关系,通过室内高压釜动态模拟实验,分别研究了钻井液中含氧量、钻井液温度、钻井液流速和钻井液盐浓度对S135钻杆钢的氧腐蚀速率影响规律。
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kappa particle:(细胞)卡巴微粒
coal mine 煤矿, 煤矿坑 | kappa particle (细胞)卡巴微粒 | salt oven 盐釜 煮盐锅
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still kettle:蒸馏釜
salinous 盐的 | still kettle 蒸馏釜 | magnetic gauge 磁力测微计
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salt pit:盐坑;盐井
salt oven (煮)盐釜 | salt pan 盐田;盐锅 | salt pit 盐坑;盐井
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saltpan:盐田;盐锅
saltoven(煮)盐釜 | saltpan盐田;盐锅 | saltpit盐坑;盐井
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hydrosulphide:氢硫化物
hydrosulfitevat亚硫酸釜 | hydrosulphide氢硫化物 | hydrosulphite亚硫酸氢盐
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chromic potassium alum:铬钾矾 硫酸铬钾
salt oven 盐釜 煮盐锅 | chromic potassium alum 铬钾矾 硫酸铬钾 | copper-bottomed (船)底包铜皮的