硝酸钙镁混合液中钙镁分离及深度脱钙方法研究

为有效分离钙镁混合液中的钙和镁,先在钙镁原液中加沉淀剂进行初步除钙,再在滤液中继续加入草酸根离子进行深度除钙,探究了不同沉淀剂及投加量和反应温度对钙脱出率的影响,实验结果表明钙镁混合液加入硫酸盐后除钙率达到96.1%,在硫酸盐脱钙后滤液中继续加草酸进行深度脱钙,其中在60℃条件下分步加草酸深度除钙后滤液中钙含量最低达到了零,且在脱钙过程中镁离子几乎不与草酸根结合沉淀出来,有效实现了钙镁分离。     

植酸钙镁的生产和应用

一、植酸钙镁的存在植酸钙镁,又叫菲丁。它广泛存在油料植物种子中,不同的种子植酸钙镁含量各不相同,几种油料植物种子植酸钙镁含量列于表1,从表1中可看出,脱脂米糠植酸钙镁含量最高。     

芒硝型卤水中盐硝组分对碱法脱除钙镁的影响

采用＂烧碱-纯碱＂法,对芒硝型卤水中Ca^2＋和Mg^2＋的脱除进行了研究,在常温、两碱用量为理论用量、反应时间为30 min和陈化时间为60 min的条件下详细考察了卤水中氯化钠和硫酸钠含量的变化对Ca2＋和Mg2＋脱除效果的影响。结果表明,硫酸钠组分对Ca2＋的脱除效果影响较大,当硫酸钠含量在30 g/L以下时,Ca2＋脱除率在90%以上,硫酸钠浓度增加有利于Mg2＋的脱除,但影响不大。氯化钠组分对Ca2＋、Mg2＋脱除效果的影响相对较小,氯化钠含量增加,Ca2＋脱除率明显增加,而Mg2＋脱除率略有下降。     

含硫废镍渣生产硫酸镍过程中钙镁的脱除

研究了用含硫废镍渣生产硫酸镍过程中钙镁杂质的脱除方法 ,结果表明 :当温度为 80℃ ,pH值为 5 .0～6 .0 ,沉淀剂的用量超过理论值 5 0 % ,反应时间 1h以上 ,静置 3h ,钙镁杂质脱除效果良好 ,生产出的硫酸镍产品达到GB6 392 - 86 ,适用于电池、电镀、蓄电池等工业。     

毒重石法生产氯化钡过程中脱除钙镁离子的研究

采用复盐沉淀法对毒重石生产氯化钡过程中的钙镁离子进行了脱除，并对ｐＨ值、复盐形成温度、熟石灰加入量等条件进行了探讨。     

氟化锰去除含锰硫酸溶液中钙、镁、锂的工艺研究

本文采用氟化锰沉淀法去除废旧锂离子电池浸出液中的钙、镁离子的同时,去除了大部分锂离子,考察了氟化锰的用量、溶液pH值、反应温度及反应时间等因素对钙、镁、锂离子沉淀率的影响.实验结果表明,当氟化锰的用量系数为1.5R2、pH=4、反应温度为60℃、反应时间为1.5 h时,钙、镁杂质的脱除效果最佳,此时钙、镁、锂的沉淀率分...     

粗硫酸镍脱除钙镁的工艺研究

研究了用化学沉淀法脱除粗硫酸镍中的Ｃａ、Ｍｇ。实验表明,络合沉淀剂是一种效果较好的沉淀剂,在６０℃、ＰＨ值在３．０－６．０之间、用量系数为１．５、反应时间１ｈ以上时,其脱除Ｃａ、Ｍｇ的效果良好,能达到电池用酸镍标准。     

Effect of time of application on the effectiveness of zinc sulphate and zinc oxide as sources of zinc for wheat

Field experiments with wheat were conducted for two years on flood plain alluvial soils to study the effectiveness of soil application of zinc sulphate and zinc oxide at 0, 15, 45, 60, 75 and 90 days after sowing. Yield and zinc uptake of wheat increased significantly with the application of zinc. Delaying the application of both zinc sulphate and zinc oxide up to 45 days of sowing did not adversly affect the zinc nutrition of wheat. However, delaying the application for 75 or 90 days after sowing eliminated the response. Zinc sulphate, when applied within 60 days of sowing performed better than zinc oxide. In a laboratory study, zinc sulphate maintained a higher level of zinc in the soil solution than zinc oxide at least over a 3-week period.     

ATMP对钙、镁离子阻垢作用机理的配位化学研究

采用电位滴定方法，运用先进的配位常数计算程序，通过恰当配位化学模型的建立，研究了水溶液中氨基三亚甲基膦酸(ATMP)自身的解离以及与Ca^2 、Mg^2 离子间的配位化学作用，测定了相应的解离常数和配合物稳定常数，并得到了各配合物物种在不同pH条件下的形态分布，从溶液配位化学的角度对ATMP的阻垢作用机理进行了讨论。     

Ca2+和Mg2+对辉钼矿可浮性的影响对比

通过辉钼矿单矿物浮选试验,Ca2+,Mg2+的溶液化学计算及辉钼矿表面Zeta电位和XPS检测,对比研究了Ca2+,Mg2+对辉钼矿可浮性影响的差异性.结果表明,Ca2+,Mg2+均会吸附于辉钼矿表面,改变辉钼矿表面Zeta电位并对辉钼矿的可浮性产生抑制作用,且随pH值增大,抑制作用增强;碱性条件下Mg2+对辉钼矿可浮...     

Thermodynamic studies on sulphate roasting for zinc electrowinning from carbonate ore

The bulk of the work consists of a theoretical study of the possibility of submitting Umm-Gheig carbonate ore to sulphate roasting. The use of the admixture with pyrites is to enable a carbonate ore to be treated in a similar way to a sulphide ore, and by doing so, to produce a roasted product capable of being treated by orthodox zinc electrowinning methods using sulphate solutions. Thermodynamic studies have been made to find the optimum conditions for sulphate roasting, in either normal air or enriched 36% oxygen air. The results obtained from the experimental work at different roasting temperatures in a tube furnace indicated that a maximum dissolution of 91.2% Zn with a 17.9% Fe could be obtained at a roasting temperature of 650°C for 4 h, followed by leaching in 4% H₂SO₄ (by vol.) at 60°C. The results of the electron microscopic investigation confirmed by metal value data given in the ASTM cards coincide well with results given by chemical analysis.     

硫酸铵与氯化钾生产硫酸钾的研究

研究了氨法脱硫副产的硫酸铵溶液直接与氯化钾进行复分解反应生成K2SO4结晶的工艺参数.离心分离K2SO4结晶,经干燥后制得合格的农用化肥硫酸钾产品.试验表明：反应时间3h、反应温度30℃、L/G为1.2,KCl与（NH4） S04质量比1.10条件下,采用硫酸铵与KCl定量配比投料能生产出硫酸钾合格品.     

Mg2+和Ca2+对自絮凝颗粒酵母耐酒精性能的影响及作用机制的比较研究

生长和冲击阶段均添加3.5mmolL-1 Mg2 或1.64 mmolL-1 Ca2 都能显著提高融合株SPSC于30℃在20% (v/v) 酒精冲击下的存活率。经过9 h冲击,对照组的存活率为0, 而添加Mg2 或Ca2 的存活率分别为53.1% 和50.0%,表明适当浓度的Mg2 或Ca2 均能显著提高菌体的耐酒精能力,但 Mg2 的促进作用强于Ca2 。通过考察 Mg2 和Ca2 对菌体于30℃在15% (v/v) 酒精冲击下细胞膜透性的影响发现,生长和冲击阶段均添加3.5 mmol稬-1 Mg2 或1.64 mmol稬-1 Ca2 的细胞膜透性系数(P?分别仅为对照组水平的15.6% 和 29.3%, 表明适当浓度的 Mg2 或 Ca2 均能显著降低受冲击菌体的细胞膜透性,但Mg2 降低膜透性能力强于Ca2 ;而且,实验显示,添加Mg2 或Ca2 提高存活率与添加Mg2 或Ca2 降低P?存在直接的对应关系。因此,Mg2 和Ca2 提高融合株SPSC耐酒精能力均与各自降低受冲击菌体的细胞膜透性密切相关。     

Extraction of zinc from ammoniacal/ammonium sulphate solutions by LIX 54

The extraction of zinc from ammoniacal/ammonium sulphate aqueous media using LIX 54 has been studied. The metal extraction rate has been examined and also the effect of temperature on the extraction of zinc (ΔH° = −8·8 kJ mol⁻¹). The effect of the aqueous pH, and therefore zinc ammine complex formation, on the extraction of zinc was studied. Stripping of the metal from loaded organic phases was carried out at various rates, temperatures (ΔH° = 3·2 kJ mol⁻¹) and sulphuric acid concentrations. The results obtained were compared with others obtained from the literature wherein different extractants were used. © 1998 SCI.     

硫酸镁的性质和用途及生产方法

介绍了硫酸镁的物理、化学性质和用途,阐述了硫酸镁的生产方法及工艺流程:硫酸法,盐湖苦卤法,苦卤复晒法,高温盐溶浸法,震荡转化法,碳酸化法,二氧化硫催化法.     

氯化钙与硫酸盐复配处理煤泥水的试验研究

用CaCl2与MgSO4、Fe2(SO4)3、Al2(SO4)3复配出新的药剂,通过3种复配药剂处理煤泥水的对比试验,优选出CaCl2与MgSO4复配作为最终选用的复配药剂,并确定了CaCl2与MgSO4的适宜比例为1：1。采用正交实验确定了钙镁复合药剂与PAM联用处理煤泥水的最佳组合条件,分析了钙镁复合药剂处理煤泥水的作用机理。