共查询到17条相似文献,搜索用时 140 毫秒
1.
2.
研究了淀粉降解预处理还原分离锰银氧化矿工艺原理及主要影响因素,当以vMn:vH2SO4:v(C6H10O5)n:vH2O=1:1.8 b:16.66 a:30配料时,锰浸出率达95.93%,银的浸出损失率<2%;浸锰渣采用氰化法提银,1 t渣用氰化钠1 kg、浸出时间3 h时,银浸出率94.15%;浸锰-氰化两步浸出银的回收率大于92.27%,锰与银被有效分离;分离工艺具有免焙烧、原矿适用面广、淀粉用量少、分离成本低等特点,具有较好的实际应用价值. 相似文献
3.
为回收某低品位锰银矿中的锰、银金属,试验以硫铁矿作还原剂,用硫酸浸出矿石中的锰;浸锰渣用硫脲浸出银。针对试样矿石,试验研究了浸出的工艺条件,选择适宜的浸出工艺进行试验,锰的浸出率达到97.10%,银的浸出率达88.91%。 相似文献
4.
5.
介绍了利用植物副产物(秸秆、粮食加工副产壳类等)作为还原剂还原浸出氧化型锰银精矿中的锰、浸锰渣氰化浸银的锰银分离工艺。玉米秸秆还原浸锰条件:秸秆粉在95 ℃预降解糖化0.5 h、降解糖化液与精矿的体积质量比为3 mL/g、硫酸与锰的物质的量比为1.4、秸秆与精矿的质量比为0.275、95 ℃浸出5 h,在此条件下锰的浸出率约92%。浸锰渣氰化浸银条件:每吨浸锰渣氰化钠用量为3 kg、常温浸银3 h,在此条件下银的浸出率达到92.20%。研究的锰银分离工艺具有较好的综合效果。 相似文献
6.
采用广西钦州市低品位软锰矿-黄铁矿与硫酸直接浸取制备硫酸锰,以锰的浸出率为观察指标,研究液固比5∶1的浸出条件如时间、温度、硫酸用量、黄铁矿用量等工艺参数,同时研究中和反应条件和浓缩结晶条件对锰浸出率的影响。结果表明:将软锰矿150 g、黄铁矿60 g与98%硫酸110 mL直接浸取制备硫酸锰,在浸出时间为5 h、温度90℃、液固比5∶1、浸出率可达98.62%。另最佳中和条件为:中和剂(CaCO3)30 g、中和时间1 h、温度90℃、终点pH值5.4;最佳浓缩结晶温度在90℃左右,结晶后直接进行热过滤,使硫酸锰和溶液分离。 相似文献
7.
研究了搅拌速率,黄铁矿用量,硫酸浓度,反应温度以及锰阳极泥的颗粒半径对锰浸出率的影响。实验结果表明,当反应温度为85℃,搅拌速率为500 r/min,颗粒半径小于0.15mm,锰阳极泥、黄铁矿、硫酸的质量比为1∶0.75∶0.92时,锰的浸出率可以达到93%。 相似文献
8.
9.
10.
对半氧化锰矿的湿法浸出过程影响因素进行了实验研究,探讨了浸出机理. 结果表明,锰矿中MnCO3的浸出速率比MnO2快,MnCO3和MnO2形成消耗H+的竞争关系,MnCO3比MnO2易获得H+而易被浸出,而MnO2分解又有利于包裹于其中的MnCO3暴露而参与反应;在半氧化锰矿用量10.0 g、蔗糖用量0.6 g、硫酸浓度5 mol/L、反应温度90℃、反应时间60 min的浸出条件下,总Mn浸出率约为90%,其中MnO2与MnCO3的浸出率分别稳定在约95%和98%;锰矿中仍有约10%锰未被浸出,是由于存在难溶的硅酸锰及部分锰被包裹于惰性脉石中. 经800℃焙烧30 min后浸出,或在浸出过程中加入1.0 g氟化铵,总Mn浸出率分别达98%和96%,表明通过高温焙烧活化或添加氟离子作为助浸剂能消除脉石层的包裹阻碍作用,有利于提高锰浸出率. 相似文献
11.
介绍了含锰量18%~20%的贫软锰矿、硫铁矿与硫酸反应直接浸取制备硫酸锰溶液,经深度净化后,再与天然净化碱卤合成制备高纯碳酸锰的工艺过程和技术条件,产品质量符合标准要求,锰的浸出率达到95%,总合成收率达到90%以上。 相似文献
12.
A hydrometallurgical process to extract silver from the silver-lead ore in Boorchi, Mongolia by using thiourea leaching solution is studied in this work. Through the observation of optical and scanning electron microscopes, and energy spectral analysis, it is determined that 5 kinds of silver minerals exist in the ore, including argentite, Ag-tetrahedrite, Ag-Zn-Sb-tetrahedrite, freibergite and acanthite. The experimental results of direct thiourea leaching of the ore show that 56%~60% of silver is leached. The main reason for the low leaching rate is due to silver minerals enveloped in galena and other minerals, even though the ore is ground to the particle size of 75 mm. When the ore is pretreated with ammonium carbonate solution under oxidation, the experimental results of thiourea leaching show that the leaching rate of silver increases to near 75% with the pretreatment. Based on the leaching experiments, a principle hydrometallurgical technological route to extract silver from the Ag-Pb ore is proposed. 相似文献
13.
为克服传统工艺的缺点,采用氧化锰矿硫酸化焙烧-水浸方法制备电解锰电解液,将氧化锰矿与硫铁矿混合高温焙烧,使四价锰还原成水溶性的二价锰,并在焙烧过程中完成硫酸化过程,生成水溶性MnSO4,而其他杂质元素生成难溶性的氧化物用水直接浸出,避免其进入电解液,不用传统工艺中的酸浸,有利于环保. 通过实验得出在S/Mn摩尔比为3、焙烧温度600℃、焙烧时间270 min的最优工艺条件下,Mn的综合浸出率可达85.6%. 表明本工艺路线是完全可行的. 相似文献
14.
15.
A hydrometalhirgical process to extract silver from the silver-lead ore in Boorchi, Mongolia by using thiourealeaching solution is studied in this work. Through the observation of optical and scanning electron microscopes, and energyspectral analysis, it is determined that 5 kinds of silver minerals exist in the ore, including argentite, Ag-tetrahedrite,Ag-Zn-Sb-tetrahedrite, freibergite and acanthite. The experimental results of direct thiourea leaching of the ore show that56%~60% of silver is leached. The main reason for the low leaching rate is due to silver minerals enveloped in galena andother minerals, even though the ore is ground to the particle size of 75 μm. When the ore is pretreated with ammoniumcarbonate solution under oxidation, the experimental results of thiourea leaching show that the leaching rate of silver increasesto near 75% with the pretreatment. Based on the leaching experiments, a principle hydrometallurgical technological route toextract silver from the Ag-Pb ore is proposed. 相似文献
16.