共查询到19条相似文献,搜索用时 109 毫秒
1.
对氧化锰矿与碳酸锰矿浸出相结合的分段浸出工艺进行研究。考察硫酸浓度、葡萄糖用量、反应温度、时间和液固比等对两段锰浸出率及浸出液余酸的影响。结果表明,在还原浸出氧化锰矿阶段,采用葡萄糖占氧化锰矿的质量比6.33%、硫酸浓度4.37 mol/L、液固比1.5、90℃反应3h,锰浸出率为93.7%;在第二浸出阶段,加入剩余阳极液及1.5倍氧化锰矿质量的碳酸锰矿,在液固比6、90℃继续反应3h时,总锰浸出率达96.1%,浸出液余酸值降为9.4g/L。 相似文献
2.
在硫酸介质中以蔗糖为还原剂浸取混生锰矿中的锰,通过单因素试验及响应面法分析了硫酸浓度、蔗糖用量、反应时间和反应温度等因素对浸出过程的影响。结果表明,在硫酸浓度5.52mol/L,蔗糖用量13.33g/L,反应时间160min和反应温度90℃的优化条件下,锰的浸出率为92.48%。 相似文献
3.
4.
5.
6.
7.
8.
随着锰产业的迅锰发展,国内高品位锰矿逐渐枯竭,有必要探索锰矿尾矿资源化利用技术。实验采用电场强化锰矿尾矿的湿法浸出过程,并探索其强化机理。通过C射线衍射(XRD)、X射线荧光分析(XRF)、扫描电镜(SEM)以及紫外可见漫反射光谱(UV—visDRS)等检测方法,分析了碳酸锰矿尾矿的结构和成分,以及浸出反应前后的物相变化行为,研究了强化浸出工艺条件。结果表明,电场可改变矿浆颗粒表面电荷分布,强化锰矿尾矿浸出过程。在电流密度为5000A/m^2、液固比6:1mL/g、矿酸比为1:0.7、温度为60℃、时间为1h时,锰浸出率可达94.23%,与同等条件不加电场时相比提高18%,尾矿锰含量由4.33%降到0.14%。 相似文献
9.
用甲酸为还原剂在硝酸体系中浸取低品位软锰矿,通过单因素试验和响应面法考察了甲酸用量、硝酸浓度、液固比、反应时间和反应温度对锰、铁、铝浸出率的影响。结果表明,当甲酸用量一定时,影响锰浸出率的因素主次依次是液固比、硝酸浓度、反应时间和反应温度。当甲酸用量为3 mL、硝酸浓度0.45mol/L、液固比5.6、反应温度90℃、反应时间2.5h时,锰、铁和铝的浸出率分别为91.01%、43.06%、21.61%。 相似文献
10.
以甲醛和铁粉为还原剂在硫酸溶液中协同还原氧化锰矿,考察了还原剂用量、硫酸体积分数、浸出时间、浸出温度、液固比和搅拌速率对锰浸出率、浸出液中铁和甲酸的质量浓度的影响,并用响应面法设计优化试验。结果表明,在硫酸的体积分数为15%、甲醛用量为理论量的90%、甲醛和铁的摩尔比为2、二者浸出时间之比为2、总浸出时间2.93h、浸出温度85℃、液固比6、转速150r/min的条件下,锰浸出率达98.04%,浸出液中铁和甲酸的质量浓度分别为13.96mg/mL、1.40mg/mL。 相似文献
11.
12.
13.
This paper presents recent results of direct reduction investigation of different combination of blends of manganese ore, iron ore and coal at the Department of Ferrous Metallurgy (IEHK) of RWTH Aachen University. A mixture of iron and manganese ore in a ratio of 75/25 is a good raw material for steelmaking of high Mn‐alloyed grades. The experimental studies consisting of reduction of (a) fine material and (b) agglomerated material (briquettes) were carried out in the range of 1273 to 1673 K. The behaviour of combined reduction of manganese ore and iron ore and the employment in the direct reduction on a coal and gas basis for production of steels with high Mn content were investigated. It was found that a high metallization degree for Mn can be reached at 1273 K with the reduction of manganese ore by hydrogen‐containing gas. Addition of carbon monoxide to the reducing gas retarded the reduction process. The addition of coal to manganese ore and iron ore blends increased the degree of reduction. The results of carbothermic reduction of briquettes consisting of a mixture of manganese ore and iron ore combined with coal as reducing agent show that a high temperature, a low Mn/Fe ratio and a high Fe2O3 content have a favourable effect on the degree of reduction. In order to obtain a high degree of metallization, the temperature should be higher than 1473 K. The reduction of briquettes at higher temperatures (up 1573 K) has shown a molten phase and the separation of slag and metal. 相似文献
14.
磺基水杨酸光度法是测定铁较常用的一种分析方法, 但由于锰离子对铁的测定有干扰, 因而实际工作中很少采用此法测定锰矿石中的铁。在pH 10左右的介质中, 铁与磺基水杨酸生成相对稳定的2∶1黄色络合物, 在420 nm处有最大吸收峰, 通过加入盐酸羟胺来消除锰矿石中锰的干扰, 据此建立了磺基水杨酸光度法测定锰矿石中铁的分析方法。采用实验方法对锰矿石国家标准物质(GBW07262和GBW07263)中的铁进行了测定, 测定值与认定值相一致, 相对标准偏差(RSD, n=5)分别为3.1%和1.1%。对锰矿实际样品进行了分析, 结果表明, 未加盐酸羟胺时, 测定结果严重偏高, 加了盐酸羟胺之后本法的测定结果与国家标准方法(GB/T 1508-2002)以及ICP-AES的测定结果基本一致。方法可用于各种品位锰矿石中铁的测定, 特别适合大批量样品的分析。 相似文献
15.
在硫酸—水溶液体系中,研究了蔗髓用量、预处理时间、硫酸浓度和反应温度等因素对高铁氧化锰矿中锰和铁浸出率的影响。结果表明,在蔗髓用量2.25g、蔗髓预处理时间15min、硫酸浓度3.0mol/L、蔗髓预处理温度65℃、浸出温度90℃的条件下,锰浸出率可达94%以上,而铁的溶出率仅为13%左右。 相似文献
16.
简要概述了国内锰矿资源的分布和特点,从矿产资源量、品位和经济效益3个方面分析了国内锰矿不能满足电解金属锰生产的现状,并指出了进口锰矿在电解金属锰生产应用中的优势与前景。 相似文献
17.
通过研究世界铁矿石市场的基本状况,分析了从事铁矿石贸易的优势和劣势。根据中国钢铁企业的采购规模,选择目标客户,采取了一些铁矿石贸易的策略和举措。 相似文献
18.
João Paulo Melo Silva Augusta Cerceau Isaac 《Mineral Processing and Extractive Metallurgy Review》2018,39(1):68-72
Cationic reverse flotation of quartz is the standard or reference concentration route for itabirites containing at least 45% iron. Preceding the flotation stage, desliming in hydrocyclones must be conducted to remove ultrafine and colloidal particles from the flotation feed. The flotation performance assessed by weight and metallurgical recoveries and silica contamination in the concentrate is impaired by lower iron feed grades. Exploratory experiments of magnetic separation indicated that iron oxide particles in the size range <37 µm are entrained toward the non-magnetic product. This finding suggested a campaign of testing an alternative circuit consisting of magnetic separation preceding reverse flotation. Magnetic separation plays the roles of desliming and pre-concentration. The achieved content of silica in the alternative route concentrate was 1.46%, meeting the market specification for blast furnace pellet of 2%. The alternative route yielded significant gains in weight and metallurgical recoveries, reaching values 3.3% and 4.4% higher, respectively. 相似文献