The salt component calcium chloride entrained in the precipitation of trimeric cyanamide phosphate can be fully removed in the mass ratio of solid to liquid 15, at temperature 40 ℃, stirring time 60 min and repeatedly washing three times with water.

該工藝路線可行欧美在线一级Ⅴa大片免费观看，反應(yīng)條件溫和美美女一级A片视频，中間媒質(zhì)三聚氰胺可循環(huán)使用www.kszhibo.com，以氯化鈣副產(chǎn)品替代了磷石膏的產(chǎn)出日韩口爆，減緩了硫資源的消耗，避免了硫酸根對(duì)三聚氰胺沉淀的影響色综合自拍欧美日韩在线，適合于貧磷礦資源的開(kāi)發(fā)a片乱伦网站。

The synthesis of thiourea can be divided into two steps. First, cyanamide was produced by dehydration of urea. Second, cyanamide reacted with Na_2S in water solution, which produce thiourea and NaOH.

首先第一步通過(guò)尿素常壓脫水制備氰胺，第二步氰胺與硫化鈉溶液在一定溫度下反應(yīng)生成硫脲及氫氧化鈉日本三级日本成网人站，而氫氧化鈉與通入的硫化氫氣體生成硫化鈉一区二区中文字幕aV在线，從而繼續(xù)參與反應(yīng)。

A new process for treatment of high-sulphur and high-arsenic gold concentrate was studied, with included the roasting at lower temperature with the addition of alkali fusion agent and the cyanidation leaching with the addition of active additive.

摘 要：研究富硫高砷金精礦在加入堿熔劑經(jīng)低溫焙燒預(yù)處理后亚洲三级黄片啊啊啊啊啊啊啊啊啊，再加活性添加劑條件下的氰化工藝Av无码一级A片在线播放，結(jié)果表明，金的氰化浸出率從直接氰化或沸騰爐焙燒后的焙砂氰化的30%～50%提高到87%～93%国产+欧美91，浸出速度也有很大提高欧美色图亚洲一区。

This paper presents qualitative analyses of the electrochemical process of cyanide and Sulphur from industrial waste water with various methods, determines the possible reactions and products, makes a number of quantitative experiments with regard to the factors influencing purification efficiency.

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The said process is simple, suitable for large-scale synthesis, high in product yield and low in cost, and the prepared cyclic dithio ether compound may be open-loop polymerized to form polymer again.

本發(fā)明方法簡(jiǎn)單，適合大規(guī)模合成66J8在线视频免费看，產(chǎn)品收率高日韩精品国语在线观看视频免费，成本低，所制備的雙硫醚環(huán)狀化合物可以通過(guò)開(kāi)環(huán)聚合再次形成聚合物亚洲爱爱视频。

The Nterminal cyclization of peptides, as one of a variety of modification introduced in sample preparation, has been preliminarily studied in this work.

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Sulfides are principal impurities in cyclopentane ,and seriously affect the color and stress of polyurethane products.

硫是環(huán)戊烷中主要雜質(zhì)，嚴(yán)重影響PU產(chǎn)品的顏色和強(qiáng)度狼友视频在线在线。

3 Recently, we reported an efficient tin-free version of this reaction involving thiophenol for the preparation of cyclopentane derivatives through a 1,5-hydrogen transfer/cyclization sequence [Eq.(1); AIBN=azobisisobutyronitrile].

最近亚洲免费视频网，我們報(bào)道了高效的、不使用錫試劑而使用苯硫酚的反應(yīng)毛片A片全免费观看，這個(gè)反應(yīng)是通過(guò)1日韩A片无码毛片免费网站，5-氫轉(zhuǎn)移/環(huán)化步驟制備環(huán)戊烷衍生物的[化學(xué)反應(yīng)式(1)；AIBN=偶氮二異丁腈][4]国产一级A片AAA毛片久久。

The easy recovery of chiral auxiliary, good selectivity and high yield of this reaction make it a potential method in the synthesis of multifunctional optically active cyclopropane derivatives.

手性硫葉立德控制的高對(duì)映選擇性合成多取代烯基環(huán)丙烷衍生物。

Four triatomic heterocyclic compounds, cyclopropane , oxa cyclopropane , ethyleneimine and thiirane were fully optimized utilizing Gaussian94 program package with a density functional theory method B3LYP and an ab initio method MP2 at 6-311 ++G** level, and the theoretical results agrees well with the reference data, which shows that this method is reliable.

使用Gaussian94程序包和密度泛函方法B3LYP以及從頭算方法MP2在B3LYP／6-311++G**基組水平上，對(duì)4種三元雜環(huán)化合物環(huán)丙烷色精品网站、環(huán)氧乙烷91自拍秀、環(huán)乙亞胺和硫雜環(huán)丙烷進(jìn)行了全優(yōu)化，其理論數(shù)據(jù)和文獻(xiàn)數(shù)據(jù)符合得很好日韩在线成人免费观看，這表明該方法是可靠的欧美A人精品综合在线。