萤石与重晶石浮选分离的新型抑制剂

ＳＤＦ是由ＮＡＳ和ＨＤＦ按一定比例混合制成的,研究表明ＳＤＦ抑制性能优于ＮＡＳ和ＨＤＦ,是最有效的调整剂,用ＴＦ２－８作捕收剂,ＳＤＦ作调整作,在ｐＨ值５至５条件下可以实现萤石与重晶石选择性分离。     

The combined effect of lead ion and sodium silicate in the flotation separation of scheelite from calcite

Flotation separation of scheelite from calcite is difficult because of the existence of the same cation in the minerals and similar physicochemical characteristics. Many studies have been performed to determine the selective depressants for calcite, but the separation of scheelite from calcite is still a big problem. In this article, the flotation separation of scheelite from calcite has been studied by flotation tests. The results show that benzohydroxamic acid has weak collecting ability to both scheelite and calcite. Lead ions can activate the flotation of scheelite and calcite, but the flotation separation of scheelite from calcite can’t be realized. The depressant saline sodium silicate (mixture of sodium silicate and lead ions) has selective depression effect on calcite and the optimum ratio of sodium silicate to lead ions is 3:1. The use of saline sodium silicate as a depressant can achieve the flotation separation of scheelite from calcite. The zeta potential results and adsorption studies showed that the pre-adsorption of saline sodium silicate only interferes with the adsorption of benzohydroxamic acid on calcite surface; this is the main reason for the selective depression effect of saline sodium silicate on calcite.     

不同模数的水玻璃在晋宁磷矿正浮选中的应用

水玻璃是一种无机胶体,在胶磷矿选矿中被广泛用作石英、硅酸盐等脉石矿物的抑制剂、矿泥分散剂和pH值调整剂等。在云南晋宁胶磷矿选矿中不同模数的水玻璃作为抑制剂和矿泥分散剂,以高模数（模数为3．1）水玻璃的选矿效率最高,选别效果更为明显。     

优质硅酸钠产品的近况和发展前景

硅酸钠是一种重要的基础化工原料，由于近几年中国经济的快速发展，对硅酸钠产品提出更高的要求，因此出现了优质硅酸钠产品。重点介绍了优质硅酸钠的技术指标和有待深入探讨的问题，并联系实际介绍其加工工艺特点，同时对该产品的未来市场前景进行了探索。该产品的市场潜力很大，前景广阔，在近期内将强劲地发展。     

抑制剂在煤泥浮选中的作用机理及应用

通过接触角测量和红外线检测分析,论述了抑制剂在浮选过程中的作用机理;试验研究了不同类型抑制剂对阳泉无烟煤高灰煤泥的浮选效果;结果表明,使用变性淀粉作为抑制剂时,精煤灰分降低最为明显,当用量为1 kg/t时,得到浮选精煤产率为64.74%,精煤灰分为8.7%。     

Flotation collophane from high-iron phosphate ore by using sodium ligninsulfonate as depressant

The contamination of iron emanating from limonite in phosphate concentrates has been a problem in phosphate ore processing. This study explored froth flotation to remove limonite away from collophane using sodium ligninsulfonate as depressant. It was observed that sodium ligninsulfonate displayed a good depression effect toward limonite but had little depression effect on collophane flotation. Additionally, the contact angle, zeta potential, and isotherm adsorption tests were performed to investigate the interaction mechanism of sodium ligninsulfonate on collophane and limonite minerals. It was found that the adsorption density of sodium ligninsulfonate onto limonite surface is higher than that onto collophane surface. The results of thermodynamic calculation indicated that sodium ligninsulfonate chemically adsorbed on limonite surface in alkaline condition, while a weak physical adsorption happened between sodium ligninsulfonate and collophane.     

云南某硅质胶磷矿浮选试验研究

通过原矿多元素分析、原矿矿物组成测定和原矿粒度筛析对原矿基本性质进行了研究,在此基础上对工艺流程选择、浮选单因素试验、开路试验、闭路试验对矿物可选性的影响进行了研究,结果表明,原矿为硅质胶磷矿,细泥含量较高,只需脱除石英和硅酸盐脉石即可获得合格精矿.采用预先分级分出细颗粒(-400目),然后对粗颗粒进行磨矿,将分级分出...     

氧化铁浸染型石英中性正浮选制备低铁石英砂

氧化铁含量是决定石英在不同领域应用的主要因素,尤其是氧化铁浸染型石英砂,因氧化铁的赋存状态、共伴生、浸染程度及粒度差异,常规擦洗、强磁选及酸法反浮选难以有效降低石英中三氧化二铁含量。中性条件下,以抑制剂抑制含铁矿物、采用捕收剂使充分解离的石英上浮,通过粗选、精选进一步降低石英精砂中三氧化二铁含量。研究表明：自然pH下,采用淀粉基抑制剂CTSS、两性捕收剂兼起泡剂ZD-3联合作用,可将此类石英砂三氧化二铁含量由130～150mg/kg降至60～100mg/kg,满足超白光伏玻璃用硅质原料的质量要求;入浮砂粒度上限为0.6mm,以≤0.5mm为宜;对含铁铝硅酸盐矿物、氧化铁浸染型石英砂,中性正浮选石英精砂三氧化二铁含量低于酸性反浮选石英精砂中该指标;热力学计算表明pH≥5.5时淀粉基抑制剂CTSS与氧化铁表面铁离子发生化学键合的标准自由能变化ΔG为负值,化学键合具有自发趋势,抑制剂CTSS与含铁矿物的优先吸附是实现石英中性正浮选提纯的关键之一。     

用氟硅酸制备冰晶石联产水玻璃的新工艺

介绍冰晶石的生产方法及湿法磷酸副产氟硅酸的利用现状。提出一种利用湿法磷酸副产氟硅酸制备冰晶石联产水玻璃的新工艺,介绍其生产步骤、工艺流程及产品质量及工艺优点。冰晶石和水玻璃符合行业标准,技术经济、可行,为氟硅酸综合利用提供了一条新途径,可以提高企业效益。     

在Ca2+-Na2CO3体系中磷灰石与石英浮选分离的溶液化学研究

利用单矿物浮选试验和X衍射光电子能谱(XPS)分析,结合溶液化学计算,研究了以油酸钠为捕收剂时,Ca<'2+>和CO<,3><'2->对磷灰石和石英单矿物浮选的作用机理.结果表明,在以碳酸钠为pH调整剂且凋浆到pH=10左右时,磷灰石的活性成分为CaHPO<,4>,添加的Ca<'2+>与溶液中的溶解组分结合生成的物质与...     

硅酸钠及碳酸钠对次氯酸钠溶液稳定性的影响

以不同浓度的硅酸钠、碳酸钠及二者混合物作稳定剂,研究它们对有效氯含量为0.5%（质量分数,下同）的次氯酸钠溶液化学稳定性的影响。测定稳定化处理后次氯酸钠溶液中有效氯的含量,结果表明：54 ℃下恒温密闭静置14 d后,加入硅酸钠、碳酸钠以及二者混合物作稳定剂的次氯酸钠溶液的有效氯,最高分别可保留初始浓度的88.16%、86.81%和92.85%;而不加任何稳定剂的次氯酸钠溶液在同样条件下其有效氯含量仅仅可保留初始浓度的76.58%。实验结果表明,硅酸钠和碳酸钠的混合物可以作为次氯酸钠溶液的良好稳定剂。     

Facile determination of foamability index of non-ionic and cationic frothers and its effect on flotation of quartz

ABSTRACT

In this work, a facile method for determination of foaming properties of frothers was used. It was based on measuring the foam height in a flotation machine at different concentrations of frothers. Based on the foam height-concentration curve, a new foaming parameter, so-called concentration at half of the maximum foam height CMH, was proposed. Assessment and usefulness of CMH were shown in flotation of quartz. The concentration of amine at the critical contact angle CCA, at which amine starts to be a collector, was also determined. The determined values of CCA were similar to CMH and were equal to 1.3, 0.14 and 0.03 mM for ButNH₂, HexNH₂ and OctNH₂, respectively. The values of CMH and CCA depended on the alkyl chain of frothers.     

Effect of surface oxidation on the flotation separation of chalcopyrite and galena using sodium humate as depressant

This study investigated the influence of mineral oxidation on Cu-Pb separation using green reagent sodium humate as depressant for galena. The flotation tests showed that sodium humate had a poor selectivity when it was used alone, especially with high dosage of sodium humate chalcopyrite could be depressed as well. Long time stirring or the addition of oxidants could significantly enhance the depressant ability of NaHA for galena. Zeta potential, electrochemical, and XPS measurement were conducted, indicating that surface oxidation of galena was conducive to the adsorption of sodium humate and then enhanced its inhibitory ability and selectivity.     

水玻璃制备二氧化硅气凝胶的水洗工艺研究

以水玻璃（Na2O·SiO2）为硅源,以磷酸作为催化剂,经超临界二氧化碳干燥后得到了低密度（29.5 kg/m3）、 高比表面积（912 m2/g）、低导热系数［0.018 W/（m·K）］的二氧化硅气凝胶。通过测试水洗后溶液的电导率,系统分析了水的用量、水洗温度、水洗时间等因素对制备二氧化硅的水洗工艺除去钠离子的效率的影响。结果表明：使用5倍体积的水在40 ℃下水洗湿凝胶,经4次水洗之后能够去除91%以上的无机盐离子,缩短了水洗时间的同时避免了大量的水的使用。     

磷肥副产物生产氟化钠联产水玻璃工艺技术

介绍利用磷肥副产氟硅酸钠生产氟化钠联产水玻璃一体化工艺技术,并探讨其工艺控制条件。固体氟硅酸钠与w(Na2CO3)20%～30%的碳酸钠溶液在90～95℃充分反应1～1.5h,得到氟化钠与二氧化硅。该工艺的关键技术是通过加入热的强碱溶液使二氧化硅完全溶解,实现氟化钠与二氧化硅的分离。该技术氟化钠与硅胶分离简单,在碱性环境(pH值8～8.5)操作,设备腐蚀小,所得产品均符合国家标准。     

碳酸钠在云南胶磷矿正浮选中的作用效果探索

碳酸钠作为一种无机调整荆,在胶磷矿选矿中被广泛用作pH调整剂、脉石细泥分散剂、活化剂等.本文对云南胶磷矿进行了加与不加碳酸钠对比试验,结果表明:在相同的刮泡时间内,加碳酸钠浮选流程的精矿产事为81.04%、累积回收率为90.97%,而不加碳酸钠的两次纯水玻璃浮选工艺漉程试硷的精矿产率分别为70.49%和74.28%、累积回收率分别为80.07%和74.85%,说明碳酸钠在胶磷矿正浮选中的活化作用非常明显.     

添加乙醇对水玻璃溶液的影响机制

通过测量质量损失、红外光谱分析、核磁共振分析等方法研究了不同浓度水玻璃溶液中滴加无水乙醇时溶液体系的变化规律。随无水乙醇的加入,溶液体系会出现分层现象,上层为澄清的乙醇水溶液,下层为有流动性的硅酸钠胶体溶液;同时发现,要形成稳定的硅酸钠胶体溶液,滴加的乙醇量存在一临界值,当超过该临界值时,硅酸钠胶体溶液变成不流动的沉淀固体。提出一种机制来解释无水乙醇的作用：乙醇分子与水分子之间的结合拉近了硅酸钠胶粒之间的距离,这有助于排除多余的水,从而降低水玻璃溶液的干燥时间及干燥过程中的能量消耗。     

新型氯化钠浮选药剂的研制

采用自行开发的氯化钠浮选剂对旱要光卤石进行选别试验，闭路试验表明，精矿含KCl23.7%,NaCl4．13％，尾矿含KCl2.90%,NaCl84.03%,精矿KCl回收率可达96．79％，NaCl排除率达84．70％。     

速溶硅酸钠的生产与应用

速溶硅酸钠属粉状无定形多硅酸钠，因易溶于水，故称速溶硅酸钠。将液体硅酸钠用烧碱调整模数后，经喷雾干燥瞬间脱水而制得。生产工艺简单，易实现自动化操作，产品指标要求高，生产中必须严格控制工艺条件。速溶硅酸钠主要作为建材助剂用于电力建设中，如：电厂烟囱、锅炉、烟道内衬砌筑用的耐酸耐热胶泥材料；还广泛用于大型设备的耐酸防腐中，如：化工、冶金行业耐酸槽内衬用的耐酸胶泥材料，还可添加在粉煤灰水泥材料中作为助磨剂和粉煤灰的活化剂。随着经济的发展，速溶硅酸钠需求量越来越大，已引起建材与化工界的重视。     

层状结晶硅酸钠的制备

就层状结晶硅酸钠的制备条件进行了探讨。发现采用KCl作为晶型转化剂，其加量为5％，在温度800℃下转化10min，δ晶型转化最完全，可以得到钙、镁离子交换量大的层状结晶硅酸钠。