为了合理开发利用广东某高硫铁矿石,针对铁精矿硫含量超标难以销售的问题,在矿石性质研究的基础上,进行了阶段磨矿—阶段磁选、浮选—磁选—浮选、磁选—浮选—磁选3种工艺方案的对比探索试验。试验结果表明:磁选—浮选—磁选工艺对该...为了合理开发利用广东某高硫铁矿石,针对铁精矿硫含量超标难以销售的问题,在矿石性质研究的基础上,进行了阶段磨矿—阶段磁选、浮选—磁选—浮选、磁选—浮选—磁选3种工艺方案的对比探索试验。试验结果表明:磁选—浮选—磁选工艺对该高硫铁矿石的脱硫效果最好,在一段磨矿细度为-0.074 mm 65%,磁场强度为80 kA/m的条件下进行弱磁选,可得到磁性产品和非磁性产品;将磁性产品再磨至-0.045 mm 90%,固定新型活化剂X用量3000 g/t,捕收剂丁基黄药用量90 g/t,起泡剂2^(#)油用量60 g/t,通过1粗1扫反浮选脱除硫铁矿,扫选尾矿在磁场强度为80 kA/m的条件下进行弱磁选,最终获得了铁品位64.88%、含硫0.42%、全铁回收率50.68%的合格铁精矿。展开更多
A 12-week feeding trial with juvenile red drum(Sciaenops ocellatus) fed high-soybean meal(SBM) diets was conducted to investigate a putative biomarker of nutritional imbalance, N-formimino-L-glutamate(FIGLU). Three fi...A 12-week feeding trial with juvenile red drum(Sciaenops ocellatus) fed high-soybean meal(SBM) diets was conducted to investigate a putative biomarker of nutritional imbalance, N-formimino-L-glutamate(FIGLU). Three fishmeal-free, 60% SBM pelleted diets(named B12, Fol, and Met, respectively) were tested to evaluate the effects on growth performance and tissue metabolite profiles of supplementation of vitamin B12(0.012 mg/kg), folate(10 mg/kg), methionine(1 g/kg) respectively, above basal supplementation levels. A fourth SBM-based diet(named B12/Fol/Met) was formulated with a combination of B12, folate, and methionine to attain the above-mentioned target concentrations. A fifth 60% SBM diet(named FWS) with methionine supplementation(1 g/kg above basal supplementation levels), enriched with taurine, lysine and threonine as well as minerals, was also tested. This diet contained formulation targets and additives which have allowed for replacing fishmeal with plant proteins in rainbow trout feeds. Control diets included a fishmeal-based diet(named FM), an unsupplemented basal 60% SBM diet(named SBM60), and a “natural” diet(named N) made up of equal parts of fish(cigar minnows), squid and shrimp as a positive reference for growth performance. Formulated feeds contained approximately 37% total crude protein, approximately 14% total crude lipid and were energetically balanced. Standard growth performance metrics were measured, and tissues(liver, muscle) were collected at week 12 to evaluate diet-induced metabolic changes using nuclear magnetic resonance(NMR)-based metabolomics.Our results show that the FWS diet outperformed all other SBM diets and the FM diet under all performance metrics(P<0.05). FIGLU was not detected in fish fed the N diet but was detected in those fed the SBM diets and the FM diet. Fish fed the FWS diet and the Met diet showed lower hepatic levels of FIGLU compared with the other SBM-based diets(P<0.05), suggesting that among the different supplementation regimes, methionine supplementation was as展开更多
马钢集团白象山铁矿选厂入选矿石主要有用矿物为磁铁矿，由于原矿实际铁品位较设计低、入选矿石性质波动大，使－35 mm 粒级磁滑轮抛尾指标尤其是抛尾产率低于设计指标，降低了选矿生产效率，增加了尾矿量和选厂运行成本。通过增加快速...马钢集团白象山铁矿选厂入选矿石主要有用矿物为磁铁矿，由于原矿实际铁品位较设计低、入选矿石性质波动大，使－35 mm 粒级磁滑轮抛尾指标尤其是抛尾产率低于设计指标，降低了选矿生产效率，增加了尾矿量和选厂运行成本。通过增加快速磁翻转高场强磁滚筒对高压辊磨细碎产品4～35 mm 粒级回笼料进行干选抛尾，并进行了分矿板距离、皮带速度、磁系转速干选条件试验，确定了较佳的工艺条件为分矿板距离100 mm、皮带速度2．60 m ／s、磁系正转转速48．7 r／min。增加磁滚筒干选抛尾的工业试验和无干选生产结果对比表明，入磨矿石铁品位提高2．49个百分点，精矿品位和回收率分别提高0．28和1．21个百分点，增加废石抛除量500 t／d，降低了尾矿输送量，提高了工艺流程的产能和生产指标，增加了经济效益，为选矿流程的技术改造提供了依据。展开更多
文摘为了合理开发利用广东某高硫铁矿石,针对铁精矿硫含量超标难以销售的问题,在矿石性质研究的基础上,进行了阶段磨矿—阶段磁选、浮选—磁选—浮选、磁选—浮选—磁选3种工艺方案的对比探索试验。试验结果表明:磁选—浮选—磁选工艺对该高硫铁矿石的脱硫效果最好,在一段磨矿细度为-0.074 mm 65%,磁场强度为80 kA/m的条件下进行弱磁选,可得到磁性产品和非磁性产品;将磁性产品再磨至-0.045 mm 90%,固定新型活化剂X用量3000 g/t,捕收剂丁基黄药用量90 g/t,起泡剂2^(#)油用量60 g/t,通过1粗1扫反浮选脱除硫铁矿,扫选尾矿在磁场强度为80 kA/m的条件下进行弱磁选,最终获得了铁品位64.88%、含硫0.42%、全铁回收率50.68%的合格铁精矿。
基金supported by the Soy Aquaculture Alliance and the United Soybean Board (USB Project Number: 1830-352-050 1-G)this is contribution number 862 from the South Carolina Department of Natural Resources Marine Resources Research Institute
文摘A 12-week feeding trial with juvenile red drum(Sciaenops ocellatus) fed high-soybean meal(SBM) diets was conducted to investigate a putative biomarker of nutritional imbalance, N-formimino-L-glutamate(FIGLU). Three fishmeal-free, 60% SBM pelleted diets(named B12, Fol, and Met, respectively) were tested to evaluate the effects on growth performance and tissue metabolite profiles of supplementation of vitamin B12(0.012 mg/kg), folate(10 mg/kg), methionine(1 g/kg) respectively, above basal supplementation levels. A fourth SBM-based diet(named B12/Fol/Met) was formulated with a combination of B12, folate, and methionine to attain the above-mentioned target concentrations. A fifth 60% SBM diet(named FWS) with methionine supplementation(1 g/kg above basal supplementation levels), enriched with taurine, lysine and threonine as well as minerals, was also tested. This diet contained formulation targets and additives which have allowed for replacing fishmeal with plant proteins in rainbow trout feeds. Control diets included a fishmeal-based diet(named FM), an unsupplemented basal 60% SBM diet(named SBM60), and a “natural” diet(named N) made up of equal parts of fish(cigar minnows), squid and shrimp as a positive reference for growth performance. Formulated feeds contained approximately 37% total crude protein, approximately 14% total crude lipid and were energetically balanced. Standard growth performance metrics were measured, and tissues(liver, muscle) were collected at week 12 to evaluate diet-induced metabolic changes using nuclear magnetic resonance(NMR)-based metabolomics.Our results show that the FWS diet outperformed all other SBM diets and the FM diet under all performance metrics(P<0.05). FIGLU was not detected in fish fed the N diet but was detected in those fed the SBM diets and the FM diet. Fish fed the FWS diet and the Met diet showed lower hepatic levels of FIGLU compared with the other SBM-based diets(P<0.05), suggesting that among the different supplementation regimes, methionine supplementation was as
文摘马钢集团白象山铁矿选厂入选矿石主要有用矿物为磁铁矿，由于原矿实际铁品位较设计低、入选矿石性质波动大，使－35 mm 粒级磁滑轮抛尾指标尤其是抛尾产率低于设计指标，降低了选矿生产效率，增加了尾矿量和选厂运行成本。通过增加快速磁翻转高场强磁滚筒对高压辊磨细碎产品4～35 mm 粒级回笼料进行干选抛尾，并进行了分矿板距离、皮带速度、磁系转速干选条件试验，确定了较佳的工艺条件为分矿板距离100 mm、皮带速度2．60 m ／s、磁系正转转速48．7 r／min。增加磁滚筒干选抛尾的工业试验和无干选生产结果对比表明，入磨矿石铁品位提高2．49个百分点，精矿品位和回收率分别提高0．28和1．21个百分点，增加废石抛除量500 t／d，降低了尾矿输送量，提高了工艺流程的产能和生产指标，增加了经济效益，为选矿流程的技术改造提供了依据。
