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Copyright of Chinese Medical Equipment Journal is the property of Chinese Medical Equipment Journal Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to systematically study the influence of the introduction of hydroxyethyl on the performance of quaternary ammonium salt collectors, flotation test, contact angle test, toxicity test, degradation test, surface tension test, Zeta potential test, molecular dynamics analysis and other methods were adopted in this paper. The performance differences of dodecyl dihydroxyethyl methyl ammonium bromide (BHMDB) and dodecyl trimethyl ammonium bromide (DTAB) were studied, and the influence mechanism of hydroxyethyl on the performance of collector quaternary ammonium salts was analyzed. Compared with DTAB, BHMDB has better collection capacity, flotation selectivity, pH adaptability and hydrophobicity. The introduction of hydroxyethyl reduces the toxicity and critical micelle concentration of the solution, but makes the degradation worse. Through the analysis of the mechanism of the collector, it can be seen that the introduction of hydroxyethyl group strengthens the hydrogen bond between the agent and the mineral surface, increases the cross-sectional area of the polar group of the agent, and makes it more selective. [ABSTRACT FROM AUTHOR]

Copyright of Multipurpose Utilization of Mineral Resources / Kuangchan Zonghe Liyong is the property of Multipurpose Utilization of Mineral Resources Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Northeastern University (Natural Science) is the property of Dongbei Daxue Xuebao and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Nonferrous Metals (Mineral Processing Section) is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Nonferrous Metals (Mineral Processing Section) is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electronic Components & Materials is the property of Electronic Components & Materials and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Flotation behavior of quartz， magnesite and dolomite in the presence of N，N-2 (3-chloride，2-hydroxypropyl)dodecylamine(NCDA) was investigated by flotation experiments. Properties and adsorption mechanism of NCDA were analyzed by zeta potential test， group electronegativity criteria and quantum chemistry calculation. Flotation results showed that， under the natural pH value of ore pulp， while the same dosages of collectors are added， NCDA has better ability to collect quartz than DDA， but the collecting ability of NCDA to magnesite and dolomite is obviously weaker than that of DDA. Results of zeta potential tests showed that NCDA adsorb on quartz surface by electrostatic adsorption and hydrogen-bond interaction. The calculation results of group electronegativity， hydrophile-lipophile balance and frontier molecular orbital energy indicated that NCDA has better collecting and foaming properties than DDA. Meanwhile， it is easier to interact with the quartz surface. [ABSTRACT FROM AUTHOR]

[Flotation behaviors of quartz and hematite in the presence of a new collector alkyl hydroxypropyl amine (NDIA) were investigated through flotation experiments. Combined with quantum chemical calculation and zeta potential analysis, the adsorption mechanism of NDIA on the mineral surface was studied. Flotation results of pure mineral showed that the flotation recovery of quartz was above 92% and the flotation recovery of hematite was around 50% , when the dosage of NDIA was 33. 33 mg/L, and pH value of the pulp was set from 4. 50 to 8. 00. Flotation results of artificial mixed mineral showed that quartz and hematite were effectively separated, when the dosage of NDIA was 33. 33 mg/L, the dosage of starch was 13. 33 mg/L and pH value of the pulp was set from 4. 50 to 8. 00. The results of quantum chemistry calculation indicated that NDIA had a better flotation performance than DDA to quartz. According to the results of zeta potential test, NDIA was adsorbed on both quartz and hematite surface, but the adsorption ability of NDIA on quartz surface was much stronger than that on hematite [ABSTRACT FROM AUTHOR]