Mono-calcium phosphate, sulfuric acid and urea were used for simulating the crystallization of calcium sulfate in the reaction of phosphate rock and urea-sulfuric acid.

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First, the speed of the reaction between mud acid and rock is very fast, the effective distance of acid is short, active acid can not reach deep formation.

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A process based upon solvent extraction has been developed for the recovery of phosphoric acid from a leaching liquor obtained by decomposition of phosphate rock with sulfuric acid.

本文采用二丁基亞砜作為萃取劑，對于用硫酸分解磷礦而得的粗磷酸進(jìn)行多級逆流萃取及反萃取国产jlzzjlzz视频免费，以獲得高純度的磷酸和磷酸鹽欧美亚日韩另类在线视频。

The potassium and phosphorus extraction rates are studied for the reactive system consisting of natural potash feldspar ,phosphate rock and phosphoric acid,with the analysis on reactants and resultants by XRD and FTIR.

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Dicalcium phosphate was formed by acidulation of phosphate rock with hydrochloric acid, and mixed with ammonium sulfate to obtain NP fertilizer product by decomposing reaction, the product is almost water soluble one.

按生成CaHPO4化學(xué)計(jì)量加入鹽酸三级在线播放，反應(yīng)完成后，加入硫酸銨進(jìn)一步轉(zhuǎn)化CaHPO4和CaCl2得到無水氮磷肥最新国产福利黄色导航，該肥料中的磷幾乎全部以水溶性P2O5存在97爱好碰。氮磷肥可作為基肥生產(chǎn)三元復(fù)混肥。

When the broken rock zone of roadway was tested by the acoustic way in a certain mine, the acoustic measuring boreholes arrangement mode was improved on the basis of the theory and principle.

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Based on indoor measurement of rock acoustic velocity,drillability, rigidity ,uniaxial compressive strength,the relationship between acoustic velocity and fragmentation parameters of rocks and that between the surface acoustic velocity and the underground mine logging acoustic velocity were explored by regression analysis.

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Based on physical properties, mineral composition, chemical components and infrared spectra, the main mineral components of "Kunjiu Jade" and "California Jade" are proved to be tremolite and actinolite respectively. Both Jades belong to nephrite in gem classification and ultrabasic rock in mineral deposit classification.

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Under high water pressure action, water current in rock mass couldn't be restricted in crannies.

而水的滲流問題又是影響巖體以及其上的建筑物穩(wěn)定的重要因素美女被操网站视频。

Author regards topography's effect on underlying horizon rock formation as distributed load, thus obtains expression of subsidiary stress induced by distributed load by integral action.

山體對其下伏巖層可作為分布載荷一本一道波多野结衣av无码，對集中力作用下水平巖層中各應(yīng)力分量積分，便求得山體對下伏水平巖層的附加應(yīng)力一级毛片中文字幕无码。