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Copyright of Mining & Metallurgy (10057854) 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.)

In view ol the comprehensive recovery and utilization of copper-arsenic precipitation produced in the process of zinc hydrometallurgy, based on the study ol mineral composition and thermal decomposition characteristics ol copper-arsenic precipitation, pressure leaching ol copper and synchronous arsenic fixation were studied, and the leaching behavior ol copper and arsenic elements was investigated. The results show that, reaction temperature ol 135 °C, reaction time of 4 h, liquid-solid ratio of 25, initial sulluric acid concentration of 50 g/L, oxygen partial pressure of 500 kPa and iron-arsenic molar ratio ol 1, the copper content in the leaching residue is only 2.03%, the copper leaching rate is 97.72%, and the arsenic content is 26.06%, the arsenic leaching rate is only 4.02%. The concentration ol Cu reaches 20. 47 g/L and the concentration ol As is less than 0. 63 g/L. The separation ellect ol copper and arsenic is ideal. During the reaction process, Cu-As undergoes oxidative dissolution firstly, and the leaching ol copper requires a certain amount of time. The leaching ol copper is carried out simultaneously with the precipitation ol arsenic. The variation trend ol the pH value ol the leaching solution and the concentration ol As in the leaching solution is basically consistent In the early stage ol the reaction, the acid generated by the lormation ol scorodite Irom arsenic and iron can supplement the acid consumed by copper leaching. [ABSTRACT FROM AUTHOR]

Copyright of Nonferrous Metals Engineering 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.)

Taking pyrite as the research object, the effects of initial sulfuric acid concentration, leaching temperature, oxygen partial pressure, mineral particle size and reaction time on the oxygen pressure leaching behavior of pyrite were studied.The results show that the initial reaction of oxygen pressure leaching of pyrite is acid consuming reaction, and the consumption rate of sulfuric acid is higher than the generation rate of sulfuric acid.In the early stage of the reaction, the iron in the leaching solution is mainly divalent iron ion, and the oxidation of iron ion occurs in the later stage of the reaction, and the trivalent iron ion can be hydrolyzed and precipitated into hematite and iron vanadium in high temperature acidic solution.In the process of oxygen pressure leaching, most sulfur elements in pyrite are converted into sulfuric acid and exist in the leachate in the form of sulfate radical, while a small part exists in the form of elemental sulfur in the leaching residue, which attaches to the surface of the leaching residue and forms a coating. [ABSTRACT FROM AUTHOR]

Copyright of Inorganic Chemicals Industry is the property of Editorial Office of Inorganic Chemicals Industry 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 Engineering 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 Engineering 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.)

The hematite precipitation residue in zinc hydrometallurgical process, which could be prepared to high added value iron oxide red via high temperature hydrothermal reaction method. In order to reveal the behavior characteristics of iron oxide, basic ferric sulfate and jarosite in high temperature hydrothermal transformation process, the thermal stability of various substances in high temperature hydrothermal reaction were studied by the thermodynamic calculation and experiment. The results show that the thermal stability of jarosite and basic ferric sulfate is poor, while that of ferric oxide is strong at the temperature of 180 260 °C. The high temperature hydrothermal conditions are favorable for the decomposition of jarosite, the hydrolysis of Fe"十 to Fe2 O3, and the transformation of basic ferric sulfate to ferric oxide. After the high temperature hydrothermal reaction at 220 °C, the iron content rise to 66. 83%, in which 97. 79% of the iron is ferric oxide and the content of ferric oxide reaches 93. 36%. However79% of the S still exists in the form of basic ferric sulfate, 0. 18% of the zinc and less than 0. 002% of the potassium and sodium exist in the form of physical inclusion. [ABSTRACT FROM AUTHOR]

Copyright of Nonferrous Metals Engineering 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 Mining & Metallurgy (10057854) 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.)

In order to comprehensively recover valuable metals from zinc leaching residue, quantitative research on acid leaching reduction of weak acid residue was carried out. The reduced residue was treated in rotary kiln. The acid leaching mixture w as separated and recovered by zinc concentrate reduction treatment- iron powder replacement copper precipitation - zinc calcine p re neutralization - zinc oxide powder neutralization indium p recipitation process. Adopting acid leaching process and rotary kiln process to treat zinc leaching residue can reduce the amount of residue and energy consumption. The results show that the zinc leaching residue can be reduced by more than 50% after acid leaching, the recovery of zinc is more than 90%, the recovery of copper is more than 99%, and the liq uid indium is less than 5 mg/L after indium precipitation. The reduced slag can enrich lead,silver and other metals. The slag is sent to rotary kiln for volatilization treatment. The zinc oxide dust can be used for neutralization and indium precipitation. The neutralization process can not only pre leach zinc from zinc oxide, but also further enrich indium. The process realizes the harmless treatment of zinc leaching residue and comprehensive utilization of resources. [ABSTRACT FROM AUTHOR]

Copyright of Nonferrous Metals Engineering 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.)

In view of the process of cobalt removal via arsenic salt purification,a study was carried out on the purification and cobalt removal with copper-arsenic precipitation from a zinc hydrometallurgy plant in Yunnan Province. The effects of two-stage purification.different time and different additives on the purification and removal cobalt were investigated. The experimental results show that the cobalt content in the medium supernatant could be reduced to less than 0. 01 mg/L,with reaction temperature of 95 °C , reaction time of 3 h.zinc powder dosage of 3 g/L,copper-arsenic precipitation dosage of 2 g/L and copper ion concentration of 400 mg/L, which can achieve the effect of deep purification and removal cobalt. [ABSTRACT FROM AUTHOR]

Based on the characteristics of complex composition,high acidity,arsenic and other heavy metal ions in the waste acid produced by the zinc smelting system, zinc waelz slag produced by zinc hydrometallurgy, which containing a large amount of valuable metals was used to treat the waste acid. This paper puts forward the main process of "Leaching waelz slag by waste acid—Arsenic — Iron co-precipitation — Copper-arsenic cementation — Neutralization and hydroxide — Hematite precipitation processWhile realizing the harmless treatment of waste acid,the valuable metal resources in zinc waelz slag are effectively used. The results showed that the leaching rate of copper,iron and zinc was above 90% in the conditions of two stages cross-current leaching,the precipitation rate of arsenic was above 95% and the precipitation residue was crystalline scorodite. The copper precipitating rate from the solution was over 99% and the iron content of hematite precipitation was up to 64. 42% which can be the raw materials of iron and iron red making processes. [ABSTRACT FROM AUTHOR]

Copyright of Hydrometallurgy of China is the property of Hydrometallurgy of China 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 Mining & Metallurgy (10057854) 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 Mining & Metallurgy (10057854) 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 Engineering 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.)

Taking zinc leached residue as the research object, the experimental study was carried out on the reductive leaching of zinc ferrite with SO2 and zinc sulfide concentrate as reducing agent, and the characteristics of the two processes were analyzed. With the continuous dissolution o£ zinc ferrite in the leaching process，a large amount of Fe3+ enters the solution, which leads to the increase of solution potential and inhibits the decomposition of zinc ferrite. The method of reductive leaching can effectively alleviate the effect of high potential in solution on the decomposition o£ zinc ferrite and improve the metal leaching rate. The two processes were analyzed from four aspects: leaching behavior of elements, composition of reductive leaching solution, composition of reductive leaching residue, and treatment of reductive leaching residue. The results show that the two processes can effectively reduce Fe3+ into Fe2+ in solution to promote the dissolution of zinc ferrite, improve the leaching rate of valuable metals， and facilitate the separation of zinc and iron in the subsequent processes. It can achieve the harmless treatment and the resource utilization of leached leaching residue. Compared with the two, SO2 reduction process is more preferable. [ABSTRACT FROM AUTHOR]

Copyright of Mining & Metallurgy (10057854) 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.)