氰化尾渣中金的回收试验研究

某黄金矿山生物氧化-氰化炭浸工艺产生的氰化尾渣中金品位较高,为2. 40~3. 60 g/t。试验考察了焙烧氧化-氰化浸出工艺回收金的可行性。结果表明:在焙烧温度500℃、弱氧化气氛下焙烧120 min,获得的焙砂在氧化钙用量15 kg/t、矿浆浓度33%、氰化钠用量1. 0 kg/t、浸出时间24 h条件下进行氰化浸出,浸渣产率为88. 80%,金浸出率在94. 92%以上;采用焙烧氧化-氰化浸出工艺回收氰化尾渣中的金是可行的。该研究为氰化尾渣中金的回收利用提供数据参考。     

贵州某微细浸染型金矿石氰化尾渣提金试验研究

贵州某微细浸染型金矿石氰化尾渣金品位为2. 06 g/t,回收利用其中的金,减少尾渣堆存,具有重要的资源和环境意义。通过XRD及电子探针等分析方法对氰化尾渣中金的分布与嵌布特征进行分析,采用氧化焙烧—硫脲浸金工艺回收氰化尾渣中的金,并对试验条件进行优化。结果表明:在氧化焙烧温度500℃、焙烧时间1. 5 h,硫脲用量37. 50 kg/t、FeCl_3用量11. 25 kg/t、pH=4、液固比4∶1、常温(22℃)常压浸出1 h条件下,氰化尾渣金浸出率达92. 18%。该研究为微细浸染型金矿石氰化尾渣提金技术的工业化应用提供参考。     

低品位焙烧氰化尾渣物相研究与综合利用

氰化尾渣具有产生量大、回收利用难、危害性大、回收价值高等综合性特点,不同来源的氰化尾渣具有不同的元素赋存状态,因此需要采用不同的处理技术。探究了焙烧氰化尾渣的物相组成,水不溶相主要为铁的氧化物、氧化不完全的硫化物和部分硫化物形成的复合锍粒;水溶相为含量约7%的钠-钙的硫酸盐。研究了金铁溶解相关性,发现尾渣中的多孔赤铁矿结构包裹了金,王水溶出过程中,金铁浸出率具有基本相似的趋势,因此,采用还原焙烧-氰化处理方案,在焦炭用量7%、焙烧温度650 ℃、焙烧时间2 h,浸出矿浆浓度25%,矿浆pH为10.5,氰化钠浓度8‰,浸出时间24 h的条件下,金的渣计浸出率为76.43%。     

铁碳微电解陶粒处理六价铬废水研究

利用废线路板粉末为主要原料制备得到铁碳微电解陶粒,将其应用于六价铬废水处理。结果表明,该陶粒对废水中六价铬有很好的去除效果,且容易再生循环利用,达到以废治废、保护环境的目的。     

氰化尾渣氯化焙烧回收有价金属的试验研究

采用氯化焙烧工艺,研究从云南某黄金矿山氰化尾渣中回收有价金属的过程,主要研究内容为氯化剂用量、还原剂用量、焙烧温度和焙烧时间对有价金属挥发效果的影响,得到的最佳工艺参数为:氯化钙用量3%、还原剂9%、焙烧温度1 000℃、焙烧时间40 min,在此条件下,氰化尾渣中Au、Ag、Pb、Zn和Cu有价金属挥发率分别为81.30%、84.49%、97.59%、72.44%、66.00%。     

复杂氰化尾渣生产球团矿的工艺试验研究

为实现氰化尾渣的无害化和高值化利用，以3种含铁复杂氰化尾渣为原料，按不同配比制备球团矿，并对试验条件进行了优化。结果表明：在膨润土用量1.2%、造球水分12.0%～12.4%、造球时间10～12 min、无需高压辊磨条件下，生球落下强度超过4.0次/(0.5 m),抗压强度超过10 N/个，爆裂温度超过400℃,满足生产指标要求；在预热温度700℃、预热时间9 min、焙烧温度1 250℃、焙烧时间6 min、均热温度1 000℃、均热时间3 min条件下，成品球团矿抗压强度≥2 793 N/个。所制备的成品球团矿化学成分、冶金性能和物理特性均能满足工业生产要求。     

焙烧氰化尾渣中氧化铁的磁化焙烧研究

对金精矿焙烧氰化浸金工艺产生的尾渣用煤粉作还原剂进行了磁化焙烧研究,通过对尾渣中铁的物相分析表明,尾渣中的铁主要以Fe2O3的形态存在。主要研究了煤粉的加入量、焙烧温度和焙烧时间对尾渣中铁的还原度的影响。结果表明,以煤为原料通过磁化焙烧可以获得Fe3O4,磁化焙烧的较优条件为焙烧温度750℃,焙烧时间1 h,煤粉用量为尾矿重量的10%,可以使焙烧处理的尾矿中Fe2O3的还原度达到51.7%,磁化焙烧后渣中的磁性矿中铁达到72.75%。     

氰化尾渣提金预处理试验研究

针对某选矿厂高硫高砷难处理金矿石经两段焙烧—氰化浸金后产生的尾渣,根据其性质分析,采用硫酸浸铁—硫脲浸金工艺进行提金试验研究。其结果表明:在最优浸铁条件下,即浓硫酸用量45 m L、温度80℃、时间4 h、液固比4∶1,产出的浸铁渣再进行硫脲浸金,铁和金的浸出率分别达到60.37%和63.44%;这表明采用该工艺可有效地从该氰化尾渣中浸出回收金。     

焙烧氰化尾渣综合利用与新工艺探讨

氰化尾渣是难处理金矿经焙烧氰化浸出后的产物,含有金、银、铁等有价金属及微量氰,必须对其进行无害化处置和资源化利用。焙烧过程由于部分铁物相发生熔融或再结晶,导致部分金被致密赤铁矿二次包裹,要回收其中的金,最有效的途径是破坏包裹金的赤铁矿。在分析现有氰化尾渣无害化处置方法以及破坏包裹金赤铁矿方法研究与工艺应用现状的基础上,针对现有工艺将氰化尾渣无害化处置和除铁两工序分开的弊端,提出将氰化尾渣除铁和脱氰两过程合并进行以及浸出液光催化降解氰的新工艺,并对新工艺进行探索研究。     

黄金冶炼氰渣火法处理研究现状及展望

焙烧氰化尾渣是含金硫化矿氰化法提金产生的固废,占氰渣总量的50%以上。其中的金被铁矿石和脉石包裹,采用火法回收工艺才可有效回收金和铁。目前的火法回收工艺有氯化挥发焙烧法回收金银、还原焙烧—磁选法回收铁、氰渣-铜精矿协同冶炼同时回收金和铁。氰渣-铜精矿协同冶炼法具有高效性、经济性和环保性,前景更加广阔。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.