Effect of calcium compounds on direct reduction and phosphorus removal of high-phosphorus iron ore

The increasing demand for iron ore in the world causes the continuous exhaustion of magnetite resources.The utilization of high-phosphorus iron ore becomes the focus.With calcium carbonate(CaCO_(3)),calcium chloride(CaCl_(2)),or calcium sulfate(CaSO_(4))as additive,the process of direct reduction and phosphorus removal of high-phosphorus iron ore(phosphorus mainly occurred in the form of Fe_(3)PO_(7) and apatite)was studied by using the technique of direct reductiongrinding-magnetic separation.The mechanism of calcium compounds to reduce phosphorus was investigated from thermodynamics,iron metallization degree,mineral composition and microstructure.Results showed that Fe_(3)PO_(7) was reduced to elemental phosphorus without calcium compounds.The iron-phosphorus alloy was generated by react of metallic iron and phosphorus,resulting in high phosphorus in reduced iron products.CaCO_(3) promoted the reduction of hematite and magnetite,and improved iron metallization degree,but inhibited the growth of metallic iron particles.CaCl_(2) strengthened the growth of iron particles.However,the recovery of iron was reduced due to the formation of volatile FeCl_(2).CaSO_(4) promoted the growth of iron particles,but the recovery of iron was drastically reduced due to the formation of non-magnetic FeS.CaCO_(3),CaCl_(2) or CaSO_(4) could react with Fe_(3)PO_(7) to form calcium phosphate(Ca_(3)(PO_(4))_(2)).With the addition of CaCO_(3),Ca_(3)(PO_(4))_(2) was closely combined with fine iron particles.It is difficult to separate iron and phosphorus by grinding and magnetic separation,resulting in the reduced iron product phosphorus content of 0.18%.In the presence of CaCl_(2) or CaSO_(4),the boundary between the generated Ca_(3)(PO_(4))_(2) and the metallic iron particles was obvious.Phosphorus was removed by grinding and magnetic separation,and the phosphorus content in the reduced iron product was less than 0.10%.

Effects of calcium compounds on the carbothermic reduction of vanadium titanomagnetite concentrate

Effects of calcium compounds on the carbothermic reduction of vanadium titanomagnetite concentrate(VTC) were investigated. It was found that calcium compounds had great effects on the metallization rate of the reduction product, the order of the metallization rate of reduction product being CaCO3 > no additive > CaSO4 > CaCl2, which indicated that the addition of CaCO3 was more conducive to promoting the reduction of iron than other calcium compounds. Gas analysis showed that there were mainly two processes in the carbothermic reduction of VTC, a solid–solid and a solid–gas reaction. The concentrations of CO and CO2 were highest when CaCO3 was added, while that in a roasting system decreased the most when CaCl2 was added. X-ray diffraction(XRD) analysis showed that calcium compounds could change the reduction process of ilmenite in VTC. The phase compositions of the reduction products were changed from metallic iron(Fe) and anosovite(FeTi2O5) to metallic iron(Fe) and perovekite(CaTiO3) when calcium compounds were added. Additionally, CaSO4 and CaCl2 could significantly promote the growth of metallic iron particles, though the existence of Fe-bearing Mg2TiO4 in reduction products was not conducive to the reduction of iron. The formation of FeS would further hinder the reduction of iron after adding CaSO4.

Catalytic depolymerization of calcium lignosulfonate by NiMgFeO_x derived from sub-micron sized NiMgFe hydrotalcite prepared by introducing hydroxyl compounds

A new method for regulating the synthesis of Ni Mg Fe hydrotalcites(NMF LDHs) with the addition of hydroxyl compounds was proposed. A series of NMF LDHs were prepared by the above method, and then were calcined to obtain the Ni Mg FeOx(NMFOx) samples. The NMFOxsamples were characterized by XRD,SEM, TG-DTG, XPS and CO2-TPD, respectively. The catalytic performance of NMFOxfor depolymerizing calcium lignosulfonate(CLS) was evaluated by hydrothermal reaction. The results showed that the addition of hydroxyl compounds favored reducing the particle sizes of NMF LDHs. For the depolymerization of CSL, the yield of liquid product increased from 45% to 75.8% with the addition of NMFOx-ethanol(NMFOxET). The liquid products were mainly phenolics, aromatics, ketones and esters. The total selectivity of oxy-containing compounds was over 90.6%, among them, the phenolics were approximately 35.2%. The valence of Ni and Fe, crystalline phase and basicity almost remained unchanged. The NMFOx-ET samples were recycled for the depolymerization of CLS, moreover, the NMFOx-ET samples had high activity and stability after 4 cycles.

Distribution and Form of Iron and Calcium Compounds Before and After Residue Hydrogenation Under Different Space Velocities

The distribution and form of iron and calcium compounds were studied using hydrogenation feedstock and hydrogenation products with different space velocities as the research object.The content of metallic elements,such as calcium and iron in hydrogenation feedstock,and extract samples were determined via flame atomic absorption spectrometry.The water-soluble iron and calcium species in oil samples were determined by an IC2010 high-throughput ion chromatograph.Nearly 60%-80%of the iron or calcium compounds were mainly concentrated in resins and asphaltenes.Iron and calcium compounds mainly exist in the form of oil-soluble metal species in hydrogenation feedstock and hydrogenation products.Under certain conditions of reaction temperature,pressure,and volume ratio of hydrogen to oil,when the reaction space velocity was 0.6 h^(−1),about 30%of the iron or calcium compounds were converted from oil-soluble to water-soluble species after hydrogenation.When the reaction space velocity was decreased from 1.70 to 0.60 h^(−1),the proportion of iron compounds converted from oil-soluble to water-soluble increased from 8.4%to 28%.Moreover,the proportion of calcium compounds converted from oil-soluble to water-soluble increased from 10%to 37%.This denotes that with decreasing reaction space velocity,the ratio of oil-soluble to water-soluble species increases.Water-soluble iron and calcium compounds are present in the form of inorganic salts,such as chlorate and sulfate.This study helps in understanding the removal mechanism of iron and calcium compounds and optimizing the operating conditions of residue hydrogenation.

Microstructure and tensile properties of AE42-based magnesium alloys with calcium addition

The as-cast microstructure of AE42 was of typical dendritic and composed of the a matrix and some needle-shaped interphases Al11RE3. A small mount of Ca addition results in significant microstructural refinement and formation of a Al2Ca phase, which showed two kinds of morphologies, lamellar and tiny granular. The former distributes on grain boundaries and the later is within the matrix grains. With the increase of Ca addition the volume fraction of Al-RE compound (Al11RE3) decreases, but Al2Ca increases. Addition of Ca causes a significant increase of yield strength of the alloy both at ambient and elevated temperatures, but a little decrease of the ductility. With calcium addition the ultimate strength decreases at ambient temperature and 150°t, but increases at 175°C and 200°C.

Effects of drug serum of anti-fibrosis I herbal compound on calcium in hepatic stellate cell and its molecular mechanism

AIM: To investigate the effects of anti-fibrosis I herbal compound on intracellular Ca2+ in activated hepatic stellate cell (HSC) and to try to survey its molecular mechanism in treatment and prevention of hepatic fibrosis and portal hypertension. METHODS: The activated HSC line was plated on small glass cover slips in 24 wells culture dishes at a density of 5×106 /mL, and incubated in RPMI-1640 media for 24 h. After the cells were loaded with Fluo-3/AM, intracellular Ca2+ was measured with laser scanning confocal microscopy (LSCM). The dynamic changes of intracellular Ca2+, stimulated by carbon tetrachloride, TGF-β1 antibody and the drug serum of anti-fibrosis I herbal compound and under orthogonal design were determined by LSCM. The effect of anti-fibrosis I herbal compound on intracellular Ca2+ was observed before and after the addition of TGF-β1 antibody. RESULTS: The intracellular Ca2+ were significantly different in different dosage of carbon tetrachloride anti-fibrosis I formula drug serum, TGF-β1 antibody and different turn of these substance, but their interval time between CCl4 and TGF-β1 antibody, CCl4 and anti-fibrosis I drug serum had no influence on intracellular Ca2+. The result showed intracellular Ca2+ wasn't significantly different between rat serum without anti-fibrosis I and untreated group. After carbon tetrachloride stimulation, intracellular Ca2+ of activated HSC increased significantly when the dosage of CCl4 from 5 to 15 mmol/L, however, decreased significantly after stimulation by 5-20 μg/mL TGF-β1 antibody or 5-20 mL/L drug serum. Moreover, before and after the addition of TGF-β1 antibody, intracellular Ca2+ was significantly different. These results suggested that the molecular mechanism was independent of blocking TGF-β1 effects. CONCLUSION: Anti-fibrosis I herbal compound may treat hepatic fibrosis and decrease portal hypertension by inhibiting activated HSC contractility through decrease of intracellular Ca2+.

Formation kinetics and transition mechanism of CaO·SiO2 in low-calcium system during high-temperature sintering

The crystal structure,formation kinetics and micro-morphology of CaO·SiO2 during high-temperature sintering process were studied in low-calcium system by XRD,FT-IR,Raman and SEM-EDS methods.When the molar ratio of CaCO3 to SiO2 is 1.0,β-2CaO·SiO2 forms firstly during the heating process,and then CaO·SiO2 is generated by the transformation reaction of pre-formed 2CaO·SiO2 with SiO2.3CaO·SiO2 and 3CaO·2SiO2 do not form either in the heating or sintering process.Rising the sintering temperature and prolonging the holding time promote the phase transition of 2CaO·SiO2 to CaO·SiO2,resulting in the sintered products a small blue shift and broadening in Raman spectra.The content of CS can reach 97.4%when sintered at 1400℃ for 1 h.The formation kinetics of CaO·SiO2 follows the second-order chemical reaction model,and the corresponding apparent activation energy and pre-exponential factor are 505.82 kJ/mol and 2.16×10^14 s^−1 respectively.

Catalytic steam methane reforming enhanced by CO_2 capture on CaO based bi-functional compounds

Sorption enhanced steam methane reforming（SE-SMR） was performed to maximize hydrogen production and contemporary remove COfrom the product stream using bi-functional sorbent-catalyst compounds.Samples were tested at two different scales: micro and laboratory. The CaO amount varied in the CaO-CaAlOsorbent system synthesized by wet mixing(CaO content of 100 wt%, 56 wt%, 30 wt%, or 0 wt% and balance of CaAlO) which were upgraded to bi-functional compounds by impregnation of 3 wt% of Ni. Nitrogen adsorption（BET/BJH）, X-Ray Diffraction（XRD）, Temperature-Programmed Reduction（TPR） and Scanning and Transmission Electronic Microscopy（SEM and TEM, respectively） analyses were performed to characterize structural and textural properties and reducibility of the bi-functional materials and evaluate their catalytic behavior. A fixed sorbent composition CaO-CaAlO(56 wt% of CaO and CaAlObalance), was chosen to study the effect of different weight hourly space times（WHST） and CHstream compositions in SE-SMR activity. Impregnated mayenite at both micro and laboratory scales showed stable Hcontent of almost 74%, with CHconversion of 72% similarly to the values reported by the sample containing 30 wt% of CaO in the post-breakthrough.Sample with 30 wt% of CaO showed promisingly behavior, enhancing Hcontent up to almost 94.5%.When the sorption enhanced reaction is performed roughly 89% of CHconversion is achieved, and after the pre-breakthrough, the catalyst worked at the thermodynamic level. During cycling sorption/regeneration experiments, even if COremoval efficiency slightly decreases, CHconversion and Hyield remain stable.

Effects of Compound Silicate Gangue on Formation of Complex Calcium Ferrite During Sintering Process

In order to improve the quality of sinter produced by Baiyunebo iron ore concentrate,the effects of compound silicate gangue containing kalium and natrium on formation of complex calcium ferrite were studied using mini-sintering test device,optical microscope（OM） analysis and scanning electron microscope（SEM）/energy dispersive X-ray spectroscopy（EDX） analysis.The results show that with the increasing of K2O and Na2O content in sintering samples,K2O and Na2O highly enriched in the glassy phases,the contents of complex calcium ferrite and hematite in sinter decreased and the porosity increased;the mineral microstructure exhibited large cavities and thin framework and became inhomogeneous.The compound silicate gangue containing kalium and natrium significantly inhibited the generation of complex calcium ferrite（SFCA）.When the content of K2O and Na2O was higher in samples,a part of K2O and Na2O entered into complex calcium ferrite,which caused the fine grains of SFCA with acicular and columnar to agglomerate into coarse grains,and its bonding effect to iron oxides reduced.The content of K2O and Na2O in sinter had effects on quantity,composition and morphology of complex calcium ferrite.

Interactions of Auxinic Compounds on Ca2+ Signaling and Root Growth in <i>Arabidopsis thaliana</i>

Auxinic-like compounds have been widely used as weed control agents. Over the years, the modes of action of auxinic herbicides have been elucidated, but most studies thus far have focused on their effects on later stages of plant growth. Here, we show that some select auxins and auxiniclike herbicides trigger a rapid elevation in root cytosolic calcium levels within seconds of application. Arabidopsis thaliana plants expressing the Yellow-Cameleon (YC) 3.60 calcium reporter were treated with indole-3-acetic acid (IAA), indole-3-butyric acid (IBA), 1-naphthalene acetic acid (NAA), and two synthetic herbicides, 2,4-dichlorophenoxyacetic acid (2,4-D) and mecoprop [2-(4-chloro- 2-methylphenoxy) propanoic acid], followed by monitoring cytosolic calcium changes over a 10 minute time course. Seconds after application of compounds to roots, the Ca2+ signaling-mediated pathway was triggered, initiating the plant response to these compounds as monitored and recorded using Fluorescence Resonance Energy Transfer (FRET)-sensitized emission imaging. Each compound elicited a specific and unique cytosolic calcium signature. Also primary root development and elongation was greatly reduced or altered when exposed at two concentrations (0.10 and 1.0 μM) of each compound. Within 20 to 25 min after triggering of the Ca2+ signal, root growth inhibition could be detected. We speculate that differences in calcium signature among the tested auxins and auxinic herbicides might correlate with their variation and potency with regard to root growth inhibition.

Grain landscape and dielectric properties of ceramics based on sodium,calcium,strontium niobates,depending on the synthesis and sintering conditions,and mechanical processing

The properties studying results of ceramics based on strontium,calcium and sodium niobates,which vary from the conditions of synthesis,sintering,and mechanical processing,are presented.The evolution of the grain structure of objects is traced depending on their phase filling during concentration changes in the composition and thermodynamic prehistory(preparation conditions).

Adrenoceptor agonists inhibit calcium-dependent potentials in rat stelate ganglion neurons

探索肾上腺素能受体激动剂对大鼠星状神经节细胞的作用及其作用机制．方法：离体交感神经节细胞内生物电记录．结果：去甲肾上腺素，可乐定（１０－３０μｍｏｌ·Ｌ－１）可逆地抑制细胞动作电位；依钙后超极化电位；在含ＴＴＸ与ＴＥＡ克氏液中记录到的钙锋电位及快兴奋性突触后电位．结论：肾上腺素受体激动剂对三种钙电位及快兴奋性突触后电位的抑制作用可能是其在突触前膜对钙内流的抑制所致．

氧化钙活化过硫酸盐修复重金属-有机物复合污染土壤

采用氧化钙活化过硫酸盐氧化法修复重金属-有机物复合污染土壤,考察了过硫酸钠投加量、过硫酸钠与氧化钙投加比、水土比等对修复效果的影响,探讨了机理。结果表明,在过硫酸钠投加量2.5 mmol/g,氧化钙与过硫酸钠投加比2∶5,水土比3∶1的条件下,汞、砷的钝化率分别为81%和83%,存在形态由弱酸提取态转化为更为稳定的残渣态,氯仿、苯、总石油烃和1,2,3-三氯丙烷的去除率分别为99%,98%,82%,80%。氧化钙一方面,催化过硫酸盐,产生硫酸根自由基和羟基自由基氧化重金属、降解有机污染物。另一方面,通过物理固封和吸附、络合、沉淀作用钝化汞、砷。研究为重金属-有机物复合污染土壤修复技术的实际应用奠定基础。

装配式装修背景下建材污染物释放特性及其预测研究

装修材料在生产和使用过程中会释放出有害物质,污染空气质量。为此,研究基于装配式装修的建材污染物释放特性,将大容量环境测试舱运用于建材污染物释放能力测试,以分析建材污染物的浓度变化,对其长期释放规律进行预测。研究结果表明,硅酸钙板在第10天的甲醛、苯、VOC浓度值分别为0.14、0.30、0.46 mg/m^(3),低于密度板材的0.29、1.14、1.72 mg/m^(3)。以某住宅为例,装配式装修的综合指数为0.91,在0.50至1.00之间,这表明该住宅室内空气未遭受污染。综上所述,研究提出的建材污染物释放规律预测具有可行性,且装配式装修可以有效降低建材污染物浓度,提升空气质量。

复配保鲜剂处理对鲜切生菜的护色效果

为明确柠檬酸与抗坏血酸钙复配处理对鲜切生菜的护色效果,将质量分数分别为0.1%,0.2%的柠檬酸与质量分数分别为0.5%,1.5%,2.5%的抗坏血素酸钙复配成6种保鲜剂,然后分别浸泡处理鲜切生菜2 min,定期测定生菜的感官品质、失重率、褐变指数、维C含量。结果表明,在4℃条件下,柠檬酸与抗坏血酸钙复配处理对鲜切生菜的护色效果显著,且能维持鲜切生菜良好的感官品质和较高的维C含量。其中,以0.1%柠檬酸+0.5%抗坏血酸钙、0.1%柠檬酸+2.5%抗坏血酸钙复配处理表现最好,保鲜期14 d。建议生产上采用0.1%柠檬酸+0.5%抗坏血酸钙复配对鲜切生菜进行护色,7 d内生菜褐变指数最低为13.7%,14 d时褐变指数为16.7%,且感官品质佳,无腐烂、萎蔫、黄化。该研究结果为鲜切生菜的加工护色提供了有效参考。

复方丹参滴丸联合阿托伐他汀钙治疗慢性心力衰竭临床观察

目的探讨复方丹参滴丸联合阿托伐他汀钙对慢性心力衰竭(congestive heart failure,CHF)患者心功能及细胞因子的影响。方法选取2020年8月—2022年8月就诊于济宁市中医院CHF患者92例进行研究,按照随机数字表法分为2组,各46例。对照组予以阿托伐他汀钙片进行治疗,观察组在对照组基础上采用复方丹参滴丸进行治疗,于治疗3个月后评估。对比2组临床疗效、心功能、细胞因子、血管活性物质、不良反应。结果观察组治疗总有效率(95.65%)高于对照组(80.43%),差异有统计学意义(P<0.05)。治疗前2组心功能、细胞因子、血管活性物质对比,差异无统计学意义(P>0.05);与对照组对比,观察组治疗后左室射血分数(left ventricular ejection fractions,LVEF)高,左室舒张末期内径(left ventricular end diastolic diameter,LVEDD)、左室收缩末期内径(left ventricular end systolic diameter,LVESD)低,6 min步行距离(six minute walk distance,6MWD)长,可溶性生长刺激表达基因2蛋白(soluble growth stimulation expression gene 2 protein,sST2)、半乳糖凝集素-3(galectin-3)水平均低,内皮素-1(endothelin-1,ET-1)、血管紧张素Ⅱ(angiotensinⅡ,AngⅡ)、脑利钠肽(brain natriuretic peptide,BNP)水平均低(P<0.05)。观察组不良反应(13.04%)与对照组(10.87%)对比,差异无统计学意义(P>0.05)。结论CHF患者经复方丹参滴丸与阿托伐他汀钙治疗后心功能得到显著改善,且血清细胞因子水平趋于正常,血管活性物质生成有效一致,且安全性高。

水玻璃复合堵漏体系中氯化钙控释技术

水玻璃-氯化钙体系是常用的油井堵漏材料,但是水玻璃和氯化钙一接触即快速反应,只能采用双液法进行施工,工序复杂。因此拟对氯化钙进行控释,以期能够将水玻璃-氯化钙混合同时泵注,简化施工。该研究通过使用树脂体系对氯化钙进行包裹完成氯化钙的控释。通过改变体系中氯化钙的加量、交联剂的加量以及单体的种类及配比,考察以上3种因素对控释效果的影响。研究发现,通过树脂对氯化钙进行包裹时,氯化钙与单体的质量比为1∶4、交联剂加量为6%,可将水玻璃-氯化钙体系失去流动性时间延长至105 min。将已包裹氯化钙的树脂粉末进行二次包裹时,氯化钙与单体的质量比为1∶2、一次包裹二次包裹交联剂加量均为6%时,可将水玻璃-氯化钙体系失去流动性时间延长至110 min。在二次包裹的树脂体系中加入氯化钠,可将体系失去流动性时间延长至180 min。通过红外光谱和SEM谱图分析发现,吸水树脂通过减少氯化钙与水玻璃的接触面积来减缓反应的进行,树脂本身不参与水玻璃与氯化钙的反应进程。

复方氨基酸胶囊治疗维持性血液透析患者营养不良及钙磷代谢障碍的有效性和安全性

目的·探索复方氨基酸胶囊治疗维持性血液透析患者营养不良及钙磷代谢障碍的有效性和安全性。方法·采用前瞻性、随机、对照、单中心的研究设计,40例上海交通大学医学院附属仁济医院的维持性血液透析患者随机分入治疗组(n=21)和对照组(n=19),治疗组在维持性血液透析常规治疗的基础上予口服复方氨基酸胶囊,对照组无特殊营养干预,每3月检测1次2组患者的血清白蛋白、前白蛋白、血红蛋白、铁蛋白,血钙、血磷、1, 25-二羟维生素D3[1, 25-(OH)_(2)-D_(3)]和全段甲状旁腺激素水平,并记录死亡、心脑血管意外、血管通路失功等不良事件的发生情况,共随访9个月。结果·治疗组血清白蛋白和前白蛋白水平在第6月和第9月时较基线升高(白蛋白t=3.574、5.599,均P<0.05;前白蛋白t/Z=-2.485、2.921,均P<0.05),对照组白蛋白在第9月开始升高,但增幅显著小于治疗组(t=3.877,P=0.001),前白蛋白水平则无明显变化。治疗组血红蛋白和铁蛋白水平在第3月即出现升高(血红蛋白t=2.192,铁蛋白t=2.994,均P<0.05)。治疗组血磷在第3月和第9月时较基线明显降低(t/Z=-2.743、-2.103,均P<0.05),而对照组血磷在第3月和第6月时无明显变化,第9月时较基线升高(Z=-2.178,P=0.029)。治疗组血钙和1, 25-(OH)_(2)-D_(3)水平在第3月和第6月均较基线升高(血钙t=4.581、4.922,均P=0.000;1, 25-(OH)_(2)-D_(3)t/Z=4.504、-2.374,均P<0.05),对照组血钙增幅显著小于同时期治疗组,1, 25-(OH)_(2)-D_(3)水平则无明显变化。2组患者的血全段甲状旁腺素水平、不良事件发生率及其他实验室指标在随访期内无统计学差异。结论·复方氨基酸胶囊在改善维持性血液透析患者营养状况、调节钙磷代谢方面有一定的疗效,且安全性高。

不同侵蚀环境下喷射混凝土耐久性提升技术及作用机理

为了揭示不同侵蚀环境下喷射混凝土的钙溶蚀行为,并探究羧酸酯型侵蚀抑制剂和硅灰对喷射混凝土抗侵蚀性能的影响,本文通过抗压强度及腐蚀溶液钙离子浓度测试对比了氯化铵溶蚀和复合盐侵蚀作用下喷射混凝土的强度损失率和钙离子溶出率的时变规律,并采用TG分析改性喷射混凝土侵蚀前的孔结构和可溶固相钙含量,最后采用XRD和SEM测试分析混凝土侵蚀后的物相组成和微观形貌。结果表明,复合盐侵蚀作用下较多钙矾石等腐蚀产物填充孔隙,导致混凝土强度损失和钙离子溶出率均低于氯化铵溶蚀。氯化铵溶蚀和复合盐侵蚀作用下,喷射混凝土的强度损失率与钙离子溶出率呈线性相关。4%(质量分数)侵蚀抑制剂+2%(质量分数)硅灰复合的作用效果较佳,可使喷射混凝土复合盐侵蚀28 d后的强度损失率和钙离子溶出率分别较空白组降低46.7%和50.9%。羧酸酯型侵蚀抑制剂和硅灰均可通过细化混凝土孔结构、降低氢氧化钙和钙矾石含量来提升喷射混凝土的耐久性。

聚卡波非钙片联合减量复方电解质散对肠道准备效果的影响

目的:探讨聚卡波非钙联合复方聚乙二醇电解质散(polyethylene glycol electrolyte powder,PEG)在结肠镜检查前肠道准备的清洁效果。方法:选择2021年11月至2022年10月于上海市第八人民医院消化内镜中心行结肠镜检查的患者225例,随机均分成3组,分别为4 L-PEG组、2 L-PEG+聚卡波非钙组、4 L-PEG+聚卡波非钙组,每组75例;记录Aronchick评分、Boston肠道准备评分量表(Boston bowel preparation scale,BBPS)、息肉及腺瘤等病变检出率、袪泡效果评分、患者耐受率、再次接受意愿程度、不良反应事件,并进行统计分析。结果:与2 L-PEG+聚卡波非钙组和4 L-PEG组比较,4 L-PEG+聚卡波非钙组Aronchick评分明显降低(P<0.05),BBPS评分(总分、左半侧、中侧、右半侧)明显增高(P均<0.05);3组间腺瘤和息肉检出率无差异(P均>0.05);4 L-PEG+聚卡波非钙组袪泡评分优于2 L-PEG+聚卡波非钙组和4 L-PEG组(P<0.05);2 L-PEG+聚卡波非钙组耐受率明显高于4 L-PEG组(P=0.001);2 L-PEG+聚卡波非钙组再次接受意愿程度高于4 L-PEG+聚卡波非钙组和4 L-PEG组(P均<0.0125);2 L-PEG+聚卡波非钙组腹胀发生率明显低于4 L-PEG组和4 L-PEG+聚卡波非钙组(P<0.01);3组恶心、呕吐、腹痛、头晕、头痛比较差异均无统计学意义(P>0.05)。结论:PEG与聚卡波非钙联用比单用PEG肠道清洁效果好,2 L-PEG与聚卡波非钙联用不逊于4 L-PEG清肠效果,且耐受性更好,再接受意愿程度更高,不良反应事件较少。