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《Minerals Engineering》2003,16(1):45-50
Colemanite is a calcium borate mineral from which boric acid and then borates are obtained. These products are useful for different applications. Colemanite leaching by sulphuric acid leads to production of boric acid. Arsenic minerals, mainly realgar and orpiment, which are often associated together with colemanite, depending on mineral paragenesis, are not leached by the acid. Arsenic components contaminate the tailings resulting from the chemical process, mainly constituted by gypsum. Sometimes the high arsenic pollution allows characterising the tail as toxic, implying very high disposal costs. In order to avoid this drawback, As content in gypsum was reduced from a level up to 2000 ppm to a value less than 500 ppm after Na2S leaching. Reagents consumption, pH and pulp density were adjusted in order to obtain a material that does not need to be disposed of in an expensive landfill as it is suitable for use as a cement additive and plaster. 相似文献
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《Minerals Engineering》2006,19(4):368-369
Boron minerals are generally concentrated using attrition methods followed by screening and classification to remove clay minerals in industrial scale. Physical concentration methods are used in Kestelek Boron Mine for the concentration of colemanite. Because of the inefficient process operation, the tailings containing about 20% B2O3 are discarded into the tailings pond. In this study, colemanite tailings sample taken from tailings pond was treated using scrubbing + screening followed by flotation to recover the lost boron. As a result of the experimental studies, a concentrate containing 44.5% B2O3 was produced with 68.4% B2O3 recovery. 相似文献
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通过正-反浮选联合流程对取自齐大山选矿厂的反浮选尾矿进行了再选试验研究,结果表明,以2,4-二羟基苯甲酸为石英抑制剂、油酸钠为捕收剂,在不加pH值调整剂的条件下,当抑制剂用量为800 g/t、捕收剂用量为550 g/t时,正浮选5 min后,粗精矿中铁的回收率可达78.85%,品位为31.86%。正浮选粗精矿反浮选试验结果表明,当磨矿细度达到95.50%-0.045 mm 时,经过1次粗选、2次精选,1次扫选,可获得精矿铁品位66.17%,铁回收率27.64%的分选指标。 相似文献
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东鞍山磁选混合精矿主要有用矿物为赤铁矿以及少量的菱铁矿和磁铁矿,脉石矿物主要为石英,铁矿物多呈细颗粒存在,铁在-37 μm粒级分布率达到82.55%。为实现东鞍山含碳酸盐磁选混合精矿中铁矿物的有效分选,采用分步与分散协同浮选工艺进行试验。结果表明:以柠檬酸为分散剂、淀粉为抑制剂、KS-Ⅲ为捕收剂经菱铁矿1次正浮选,正浮选尾矿以NaOH为pH调整剂、淀粉为抑制剂、CaO为活化剂、KS-Ⅲ为捕收剂经1粗1精2扫赤铁矿反浮选闭路试验,获得了铁品位为67.89%、回收率为69.35%的铁精矿。分步与分散协同浮选通过将分步浮选工艺和分散浮选技术结合起来形成协同作用而对含碳酸盐难选铁矿石产生了较好的分选效果。 相似文献
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多年的生产实践与试验研究表明,根据原矿性质的不同可综合利用矿产资源。采用合理的选矿流程、混合用药,从沉积多年的尾矿中浮选回收萤石获得了精矿品位为95.5%,回收率为75%的较好生产指标。 相似文献
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《Minerals Engineering》1999,12(2):229-234
Selective resinite flotation was studied for high ash coal under different conditions. It was found that both the grade and recovery of the obtained resinite depend on the type of frother used. The grade was improved to reach 80% with a recovery of 70% through wet screening, grinding and pH control. 相似文献
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介绍了采用高效活化剂和捕收剂从雄黄浮选尾矿中浮选回收雌黄的技术。工业试验结果证明:采用该方法可从含雌黄2.71%左右的入选原料中,经过一粗四精二扫的浮选作业,获得含As2S389.68%,回收率71.48%的雌黄精矿。应用结构化学、溶液化学、溶度积假说和“矿物浮选与化学元素周期表”理论讨论了其浮选作用机理。 相似文献
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美国阿拉斯加州费尔班克斯附近的 FortKnox矿于 1 997年正式投产 ,该矿储量 1 .47亿t,平均含金 0 .85g/ t。日产 3.6万 t矿石 ,实行36 5d/ a工作制度 ,设备利用率达 94%。Fort Knox金矿床位于多相花岗岩中。金赋存于乳白色石英网状脉与充填石英的花岗岩裂隙中 ,金的嵌布粒度通常在 1 0 μm以下。露天矿采出的原矿在采场附近的旋回破碎机中粗碎至 2 0 cm后由胶带运输机送至 0 .9km外选厂的粗矿储矿场。粗矿石由取料机取出后运至一台 1 0 m× 4.5m的半自磨机。半自磨机的+ 1 2 .5mm排矿经一台 2 m圆锥破碎机破碎后返回半自磨机 ,-1 2 .5m粒… 相似文献
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针对贵州某硅-钙质胶磷矿,采用双反浮选工艺进行了试验研究。结果表明,在磨矿细度-74 μm粒级占82.50%,粗选捕收剂YW-01用量1.4 kg/t、调整剂硫酸用量14 kg/t,精选捕收剂SEA用量0.5 kg/t条件下,通过一粗一精一扫闭路浮选,可得到P2O5品位30.54%、回收率88.59%、MgO含量0.81%、SiO2含量12.28%的磷精矿。 相似文献
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利用反浮选对黄铁矿进行脱砷研究 总被引:5,自引:0,他引:5
硫砷分离一直是选矿界所面临的难题之一。本文研究了氧化钙、铜离子、栲胶及丁基黄药对黄铁矿和毒砂单矿物浮选的影响 ,提出了抑硫浮砷的分离方案 ,并利用实际高砷硫精矿进行验证 ,取得了一定效果 ,为黄铁矿脱砷提出了一条新思路。 相似文献