某泥岩型铀矿石预处理技术研究

我国北方某泥岩型铀矿石泥化严重,矿石中的碳酸盐矿物和石膏含量高,采用常规搅拌直接浸出回收铀时,试剂消耗量大、铀浸出率低、生产成本高。为解决此问题,在浸出之前先对矿石进行了搅拌打散—筛分分级—粗粒堆浸—细粒浮选分组预处理,即将矿石分成+0.15 mm和-0.15mm两个粒级,80%以上的石膏赋存于+0.15 mm粗粒级中,这部分矿石可以不磨矿,采用堆浸法能够回收其中的铀,铀浸出率87.50%;90%以上的碳酸盐矿物赋存于-0.15 mm细粒级中,该粒级以氧化石蜡皂作为碳酸盐矿物浮选的捕收剂,水玻璃作为分散剂和活化剂,采用1次粗选2次精选开路浮选工艺流程处理,可获得-0.15 mm粒级高碳酸盐含铀产品和低碳酸盐含铀产品,高碳酸盐含铀产品作业产率28.72%,CO2含量33.85%,作业回收率84.68%。

某地黑钨矿尾矿综合利用工艺研究

针对某地黑钨矿尾矿的矿石特性，研究提出了“分组分离”浮选－重选新工艺，综合回收了尾矿中的绿柱石、萤石和钨矿物。研究结果表明：ＳＢ是盐类矿物和硅酸盐矿物分组浮选时硅酸盐矿物的有效抑制剂，ＳＢ１是盐类矿物分离浮选时、方解石类碳酸盐矿物和白钨矿的选择性抑制剂；ＮＭ－１２ｊ是硅酸盐矿物分离浮选时石英、云母等硅酸盐脉石矿物的选择性捕收剂。

Adsorption mechanism of sodium oleate and styryl phosphonic acid on rutile and amphibole surfaces

A reagent combination of sodium oleate(NaOl)and salicyl hydroximic acid was employed as the roughing and scavenging collectors,whereas styryl phosphoric acid(SPA)and octanol were employed as the cleaning collectors.Results of bench-scale flotation demonstrate that the dosage of SPA can be reduced by about 80%,and that a better flotation index can be obtained using the proposed reagent system.The results of adsorption amount and contact angle measurements indicate that the rutile surface adsorbed not only a large amount of residual NaOl but also SPA and a small amount of NaOl remained on the amphibole surface in strong acidic solution.The hydrophobic difference between rutile and amphibole surfaces was therefore amplified in cleaning,and their further separation became much easier consequently.

Adsorption of octanohydroxamic acid at fluorite surface in presence of calcite species

The surface properties of fluorite are often affected by dissolved gangue species(e.g.,calcite)during the flotation process.Microflotation testing with and without the addition of calcite supernatant was conducted using octanohydroxamic acid(OHA)as the collector.The results revealed that dissolved calcite species significantly affected the flotation behavior of fluorite.Fourier transform infrared spectra confirmed that the decrease in flotation recovery was linked to lower OHA adsorption.Solution chemistry analysis indicated that CaCO_(3) and Ca^(2+)from the calcite supernatant were the most favorably adsorbed species,and X-ray photoelectron spectroscopy analysis confirmed the surface adsorption of calcite species.Density functional theory simulations provided a detailed analysis of the multidentate adsorption configuration of OHA,which was the most favorable for adsorption on the fluorite surface.The adsorption energy calculation showed that the calcite dissolved species were more stably adsorbed on the fluorite surface than OHA.The pre-adsorption of calcite dissolved species hindered the adsorption of OHA due to electrostatic repulsion.

Effect and mechanism of dolomite with different size fractions on hematite flotation using sodium oleate as collector

The effect of dolomite with different particle size fractions on hematite flotation was studied using sodium oleate as collector at p H of about 9. The effect mechanism of dolomite on hematite flotation was investigated by means of solution chemistry, ultraviolet spectrophotometry(UV), inductively coupled plasma atomic emission spectrometry(ICP-AES) and X-ray photoelectron spectroscopy(XPS). It is observed that dolomite with different size fractions has depressing effect on hematite flotation using sodium oleate as collector, and dolomite could be the "mineral depressant" of hematite using sodium oleate as collector. The reasons for that are concerned with sodium oleate consumption and the adsorption onto hematite of dissolved species of dolomite.

Flotation characteristics of Shenfu coal macerals

The flotation characteristics of Shenfu coal macerals was researched. Taking flotation recovery and enrichment of macerals as the evaluation objects, the influence of the agent dosage, pulp concentration, impeller speed and aeration rate on the separating effect was investigated. And the optimum process conditions of flotation were confirmed. The results show that the agent dosage, pulp concentration, impeller speed and aeration rate have a significant impact on flotation recovery and en- richment of macerals. The float recovery was 73.28% and enrichment ratio of vitrinite was 83.89% when CTAB dosage of 1.0 kg/t, pulp concentration of 100 g/L, impeller speed of 1 700 r/min and aeration rate of 0.25 m3/（m2·min） were used. The tailings yield was 60.30% and enrichment ratio of inertinite was 61.44% when CTAB dosage of 0.5 kg/t, pulp concentration of 100 g/L, impeller speed of I 700 r/min and aeration rate of 0.20 m3/（m2·min） were used.