Effect of Na_(2)CO_(3)Roasting Activation on Acid Leaching Property of Fly Ash

By using high-alumina fly ash as raw material,a process was proposed for activating the fly ash with Na_(2)CO_(3)calcination and extracting aluminum from activated clinker with sulfuric acid leaching.The feasibility of roasting process of activated fly ash by Na_(2)CO_(3)was discussed based on thermodynamic analysis.The experimental results showed that Na_(2)CO_(3)gradually reactes with mullite over 700 K to produce NaAlSiO_(4).The optimal process conditions for the activation stage are:a material ratio of 1:1 between sodium carbonate and fly ash,a calcination temperature of 900℃,and a calcination time of 2.5 hours.Under these conditions,the leaching rate of aluminum is 90.3%.By comparing the SEM and XRD analysis of raw and clinker materials,it could be concluded that the mullite phase of fly ash is almost completely destroyed and transformed into sodium aluminosilicate with good acid solubility.

Hydrometallurgical processing of chalcopyrite:A review of leaching techniques

Copper,an essential metal for the energy transition,is primarily obtained from chalcopyrite through hydrometallurgical and pyrometallurgical methods.The risks and harmful impacts of these processes pose significant concerns for environmental and human safety,highlighting the need for more efficient and eco-friendly hydrometallurgical methods.This review article emphasizes current pro-cesses such as oxidative leaching,bioleaching,and pressure leaching that have demonstrated efficiency in overcoming the complicated chalcopyrite network.Oxidative leaching operates under benign conditions within the leaching media;nevertheless,the introduction of oxidizing agents provides benefits and advantages.Bioleaching,a non-aggressive method,has shown a gradual increase in copper extrac-tion efficiency and has been explored using both primary and secondary sources.Pressure leaching,known for its effectiveness and se-lectivity in copper extraction,is becoming commercially more viable with increased research investments.This research also provides im-portant data for advancing future research in the field.

Study on synergistic leaching of potassium and phosphorus from potassium feldspar and solid waste phosphogypsum via coupling reactions

To achieve the resource utilization of solid waste phosphogypsum(PG)and tackle the problem of utilizing potassium feldspar(PF),a coupled synergistic process between PG and PF is proposed in this paper.The study investigates the features of P and F in PG,and explores the decomposition of PF using hydrofluoric acid(HF)in the sulfuric acid system for K leaching and leaching of P and F in PG.The impact factors such as sulfuric acid concentration,reaction temperature,reaction time,material ratio(PG/PF),liquid–solid ratio,PF particle size,and PF calcination temperature on the leaching of P and K is systematically investigated in this paper.The results show that under optimal conditions,the leaching rate of K and P reach more than 93%and 96%,respectively.Kinetics study using shrinking core model(SCM)indicates two significant stages with internal diffusion predominantly controlling the leaching of K.The apparent activation energies of these two stages are 11.92 kJ·mol^(-1)and 11.55 kJ·mol^(-1),respectively.

Selective leaching of lithium from spent lithium-ion batteries using sulfuric acid and oxalic acid

Traditional hydrometallurgical methods for recovering spent lithium-ion batteries(LIBs)involve acid leaching to simultaneously extract all valuable metals into the leachate.These methods usually are followed by a series of separation steps such as precipitation,extraction,and stripping to separate the individual valuable metals.In this study,we present a process for selectively leaching lithium through the synergistic effect of sulfuric and oxalic acids.Under optimal leaching conditions(leaching time of 1.5 h,leaching temperature of 70°C,liquid-solid ratio of 4 mL/g,oxalic acid ratio of 1.3,and sulfuric acid ratio of 1.3),the lithium leaching efficiency reached89.6%,and the leaching efficiencies of Ni,Co,and Mn were 12.8%,6.5%,and 21.7%.X-ray diffraction(XRD)and inductively coupled plasma optical emission spectrometer(ICP-OES)analyses showed that most of the Ni,Co,and Mn in the raw material remained as solid residue oxides and oxalates.This study offers a new approach to enriching the relevant theory for selectively recovering lithium from spent LIBs.

Effect of Saline Water on Soil Acidity, Alkalinity and Nutrients Leaching in Sandy Loamy Soil in Rwamagana Bella Flower Farm, Rwanda

The necessity to saline and sodic waters is sometimes used for irrigating agricultural activities under certain circumstances, but it is important to note that the use of these waters comes with specific considerations and limitations. One way to decrease undesirable effects of sodic waters on the physical and chemical properties of soils is to apply organic and chemical amendments within the soil. This study aimed to assess the effectiveness of saline water on soil acidity, alkalinity and nutrients leaching in sandy loamy soil at Bella flower farm, in Rwamagana District, Rwanda. The water used was from the Muhazi Lake which is classified as Class I (Saline water quality). Column leaching experiments using treated soils were then conducted under saturated conditions. The soil under experimental was first analyzed for its textural classification, soil properties and is classified as sandy loamy soil. The t-test was taken at 1%, 5% and 10% levels of statistical significance compared to control soil. The results indicated that the application of saline water to soils caused an increase in some soil nutrients like increase of Phosphorus (P), Potassium (K+), Magnesium (Mg2+), Sulphur (S), CN ratio and Sodium (Na+) and decreased soil texture, physical and chemical properties and remained soil nutrients. Consequently, the intensive addition of saline water leachates to soil in PVC pipes led to decreased of soil EC through leaching and a raiser Soluble Sodium Percentage (SSP). The rate of saline water application affected the increase accumulation of SAR and Na% in the top soil layers. The study indicated that saline water is an inefficient amendment for sandy soil with saline water irrigation. The study recommends further studies with similar topic with saline water irrigation, as it accentuated the alkalinity levels.

Experimental investigation of dynamic characteristics of leaching tubing for solution mining of salt cavern carbon and energy storage

Salt caverns are extensively utilized for storing various substances such as fossil energy,hydrogen,compressed air,nuclear waste,and industrial solid waste.In China,when the salt cavern is leached through single-well water solution mining with oil as a cushion,engineering challenges arise with the leaching tubing,leading to issues like damage and instability.These problems significantly hinder the progress of cavern construction and the control of cavern shape.The primary cause of this is the flowinduced vibration instability of leaching tubing within a confined space,which results in severe bending or damage to the tubing.This study presents a model experimental investigation on the dynamic characteristics of leaching tubing using a self-developed liquid-solid coupling physical model experiment apparatus.The experiment utilizes a silicone-rubber pipe(SRP)and a polycarbonate pipe(PCP)to examine the effects of various factors on the dynamic stability of cantilevered pipes conveying fluid.These factors include external space constraint,flexural rigidity,medium outside the pipe,overhanging length,and end conditions.The experiments reveal four dynamic response phenomena:water hammer,static buckling,chaotic motion,and flutter instability.The study further demonstrates that the length of the external space constraint has a direct impact on the flutter critical flow velocity of the cantilevered pipe conveying fluid.Additionally,the flutter critical flow velocity is influenced by the end conditions and different external media.

Extraction of Valuable Metals from Titanium-bearing Blast Furnace Slag by Acid Leaching

To realize the resource utilization of the valuable metals in the titanium-containing blast furnace slag,the process route of “hydrochloric acid leaching-electrolysis-carbonization and carbon dioxide capture-preparation of calcium carbonate” was proposed.In this study,the influences of process conditions on the leaching rates of calcium,magnesium,aluminum,and iron and the phases of the leaching residue were investigated for the leaching process.The experimental results show that the HCl solution could selectively leach the elements from the titanium-containing blast furnace slag.The better leaching conditions are the HCl solution concentration of 4 mol/L,the leaching time of 30 min,the ratio of liquid volume to solid gas of 10 mL/g,and the stirring paddle speed of 300 r/min.Under the conditions,the leaching rates of calcium,magnesium,aluminum,and iron can reach 85.87%,73.41%,81.35%,and 59.08%,and the leaching rate of titanium is 10.71%.The iron and the aluminum are removed from the leachate to obtain iron-aluminum water purification agents,and the magnesium is removed from the leachate to obtain magnesium hydroxide.The leaching residue phase is dominated by perovskite,followed by magnesium silicate and tricalcium aluminate,and the titaniumrich material could be obtained from the leaching residue by desiliconization.

Recovery of Li, Ni, Co and Mn from spent lithium-ion batteries assisted by organic acids: Process optimization and leaching mechanism

The proper recycling of spent lithium-ion batteries(LIBs)can promote the recovery and utilization of valuable resources,while also negative environmental effects resulting from the presence of toxic and hazardous substances.In this study,a new environmentally friendly hydro-metallurgical process was proposed for leaching lithium(Li),nickel(Ni),cobalt(Co),and manganese(Mn)from spent LIBs using sulfuric acid with citric acid as a reductant.The effects of the concentration of sulfuric acid,the leaching temperature,the leaching time,the solid-liquid ratio,and the reducing agent dosage on the leaching behavior of the above elements were investigated.Key parameters were optimized using response surface methodology(RSM)to maximize the recovery of metals from spent LIBs.The maxim-um recovery efficiencies of Li,Ni,Co,and Mn can reach 99.08%,98.76%,98.33%,and 97.63%.under the optimized conditions(the sulfuric acid concentration was 1.16 mol/L,the citric acid dosage was 15wt%,the solid-liquid ratio was 40 g/L,and the temperature was 83℃ for 120 min),respectively.It was found that in the collaborative leaching process of sulfuric acid and citric acid,the citric acid initially provided strong reducing CO_(2)^(-),and the transition metal ions in the high state underwent a reduction reaction to produce transition metal ions in the low state.Additionally,citric acid can also act as a proton donor and chelate with lower-priced transition metal ions,thus speeding up the dissolution process.

Process engineering of demineralisation of moderate to high ash Indian coals through NaOH‑HCl leaching and HF leaching

Chemical leaching of coals would be required to produce cleaner coals for some special applications where physical benefi-ciation may not be effective enough.This would also help in recovering Li and rare earth metals besides in the sequestration of CO_(2).About 20 Indian coals having complexly distributed moderate to high ash contents were sequentially treated with various alkali–acid such as NaOH-HCl,HF,HCl,HCl-HF,and NaOH-HCl-HF leaching.This aimed to establish and design the best stepwise sequential process for the highest degree of demineralisation through a chemical leaching process.Kinetics and process intensification studies were carried out.More than 80%demineralisation of Madhaipur and Neemcha coals was observed using the best sequential treatment designed presently.The repeated stepwise treatment of the alkali and the acid was also studied,which was found to significantly enhance the degree of demineralisation of coals.The integrated process of alkali–acid leaching followed by solvent extraction(Organo-refining)and vice versa of the treated coal was also studied for producing cleaner coals.

Preparation of sodium molybdate from molybdenum concentrate by microwave roasting and alkali leaching

The preparation process of sodium molybdate has the disadvantages of high energy consumption,low thermal efficiency,and high raw material requirement of molybdenum trioxide,in order to realize the green and efficient development of molybdenum concentrate resources,this paper proposes a new process for efficient recovery of molybdenum from molybdenum concentrate and preparation of sodium molybdate by microwave-enhanced roasting and alkali leaching.Thermodynamic analysis indicated the feasibility of oxidation roasting of molybdenum concentrate.The effects of roasting temperature,holding time,and power-to-mass ratio on the oxidation product and leaching product sodium molybdate (Na_(2)MoO_(4)·2H_(2)O) were investigated.Under the optimal process conditions:roasting temperature of 700℃,holding time of 110 min,and power-to-mass ratio of 110 W/g,the molybdenum state of existence was converted from MoS_(2) to Mo O3.The process of preparing sodium molybdate by alkali leaching of molybdenum calcine was investigated,the optimal leaching conditions include a solution concentration of 2.5 mol/L,a liquid-to-solid ratio of 2 mL/g,a leaching temperature of 60℃,and leaching solution termination at pH 8.The optimum conditions result in a leaching rate of sodium molybdate of 96.24%.Meanwhile,the content of sodium molybdate reaches 94.08wt%after leaching and removing impurities.Iron and aluminum impurities can be effectively separated by adjusting the pH of the leaching solution with sodium carbonate solution.This research avoids the shortcomings of the traditional process and utilizes the advantages of microwave metallurgy to prepare high-quality sodium molybdate,which provides a new idea for the highvalue utilization of molybdenum concentrate.

Study on metal recovery process and kinetics of oxidative leaching from spent LiFePO_(4)Li-batteries

A green environmental protection and enhanced leaching process was proposed to recover all elements from spent lithium iron phosphate(LiFePO_(4)) lithium batteries.In order to reduce the influence of Al impurity in the recovery process,NaOH was used to remove impurity.After impurity removal,the spent LiFePO_(4) cathode material was used as raw material under the H_(2)SO_(4) system,and the pressure oxidation leaching process was adopted to achieve the preferential leaching of lithium.The E-pH diagram of the Fe-P-Al-H_(2)O system can determine the stable region of each element in the recovery process of spent LiFePO_(4)Li-batteries.Under the optimal conditions(500 r·min^(-1),15 h,363.15 K,0.4 MPa,the liquid-solid ratio was 4:1 ml·g^(-1)and the acid-material ratio was 0.29),the leaching rate of Li was 99.24%,Fe,Al,and Ti were 0.10%,2.07%,and 0.03%,respectively.The Fe and P were precipitated and recovered as FePO_(4)·2H_(2)O.The kinetic analysis shows that the process of high-pressure acid leaching of spent LiFePO_(4) materials depends on the surface chemical reaction.Through the life cycle assessment(LCA)of the spent LiFePO_(4) whole recovery process,eight midpoint impact categories were selected to assess the impact of recovery process.The results can provide basic environmental information on production process for recycling industry.

^(18)F-FDG PET-CT显像诊断同时性多原发癌1例

多原发癌病例临床上少见,根据两癌发生的间隔时间分为同时性和异时性,临床上早期发现、早期诊断多原发癌对指导治疗及患者预后具有重要意义。本文报道通过^(18)F-FDG PET-CT显像发现的1例同时性多原发口咽淋巴瘤、肺腺癌患者,对其^(18)F-FDG PET-CT影像特点进行分析,显示出^(18)F-FDG PET-CT显像检查具有很好的诊断效能。

18F-FDG PET/CT在高危分化型甲状腺癌转移中的诊断价值

目的:探讨18F-氟代脱氧葡萄糖(18F-Flurodeoxyglucose,18F-FDG)PET/CT在高危分化型甲状腺癌转移中的诊断价值。方法:回顾性收集2018年9月~2021年11月在本院就诊的甲状腺癌患者102例临床资料,均进行18F-FDG PET/CT和131I全身显像检查。统计两种检查方法对病灶部位转移状况的判别水平及分析18F-FDG PET/CT显像与甲状腺球蛋白水平相关性。工作特征曲线(Receiver Operating Characteristic Curve,ROC)评估18F-FDG PET/CT显像、131I全身显像检查、甲状腺球蛋白水平对高危分化型甲状腺癌的预测价值。结果:102例高危分化型甲状腺癌患者,男性53例,女性49例,年龄<30岁48例,≥30岁54例,病理类型:乳头状癌患者93例,占比91.18%,滤泡状癌患者9例,占比8.82%;淋巴结转移情况:淋巴结转移患者71例,占比69.61%,无淋巴结转移患者31例,占比30.39%。18F-FDG PET/CT检查阳性率67.65%显著高于131I全身显像检查的阳性率53.92%,差异具有统计学意义(P<0.05)。阳性组(n=65)甲状腺球蛋白水平(168.74±86.88)μg/L显著高于阴性组(n=37)的甲状腺球蛋白水平(31.95±14.73)μg/L,差异具有统计学意义(t=11.536,P<0.001)。ROC曲线分析显示,18F-FDG PET/CT显像检查后,曲线下面积(Area Under the Curve,AUC)为0.934,敏感度为86.8%,特异度为100.0%,95%置信区间范围为0.865~1.000,差异具有统计学意义(P<0.05);131I全身显像检查的AUC为0.804,敏感度为60.4%,特异度为100.0%,95%置信区间范围为0.685~0.922,差异具有统计学意义(P<0.05);甲状腺球蛋白水平诊断高危分化型甲状腺癌转移的AUC为0.907,敏感度为86.9%,特异度为100.0%,95%置信区间范围为0.821~0.997,差异具有统计学意义(P<0.05)。结论:18F-FDG PET/CT在诊断高危分化型甲状腺癌的转移方面具有一定价值,其灵敏度与甲状腺球蛋白水平呈正相关,可作为发现高危分化型甲状腺癌转移的有效手段。

基于定量CT身体组分、^(18)F-FDG PET/CT显像预测手术联合新辅助化疗治疗早期乳腺癌预后的价值

目的 分析定量CT (QCT)身体组分、^(18)F-氟脱氧葡萄糖正电子发射型计算机断层显像(^(18)F-FDG PET-CT)对手术联合新辅助化疗(NAC)治疗早期乳腺癌患者预后的预测效能,为临床治疗提供参考。方法 选取2020年3月至2022年10月于南阳市第二人民医院接受手术联合NAC治疗的82例早期乳腺癌患者纳入研究,在NAC前和化疗1、3个周期后检测记录QCT参数[L_(1)、L_(2)水平的皮下脂肪面积(SFA)、内脏脂肪面积(VFA)、骨密度(BMD)、L_(3)水平的椎旁肌肉面积(TMA)]、^(18)F-FDG PET/CT显像的最大标准摄取值(SUV_(max))、肿瘤代谢体积(MTV)。NAC结束后进行手术,随访12个月(失访2例),依据有无复发转移分为预后良好组43例和预后不良组37例,比较不同预后患者的QCT参数、^(18)F-FDG PET/CT显像指标,采用受试者工作特征(ROC)曲线获取曲线下面积(AUC)分析其对早期乳腺癌患者预后的预测效能。结果化疗1个周期后,预后良好组患者的SFA、BMD、VFA、MA水平分别为(45.23±4.07) cm^(2)、(128.97±26.53) mg/m^(2)、(78.07±6.69) cm^(2)、(37.36±5.74) cm^(2),明显高于预后不良组的(42.52±3.32) cm^(2)、(112.54±25.82) mg/m^(2)、(73.73±7.25) cm^(2)、(32.94±5.31) cm^(2),差异均有统计学意义(P<0.05);化疗3个周期后,预后良好组患者的SFA、BMD、VFA、MA水平分别为(40.95±3.92) cm^(2)、(113.55±15.87) mg/m^(2)、(73.59±6.17) cm^(2)、(32.67±4.98) cm^(2),明显高于预后不良组的(37.51±3.56) cm^(2)、(95.18±17.45) mg/m^(2)、(70.30±5.14) cm^(2)、(28.52±4.42) cm^(2),差异均有统计学意义(P<0.05);化疗1个周期后,预后良好组患者的SUV_(max)、MTV分别为5.43±1.25、(3.86±0.87)×10^(4)mm,明显低于预后不良组的6.04±1.07、(4.27±0.85)×10^(4)mm,差异均有统计学意义(P<0.05);化疗3个周期后,预后良好组患者的SUV_(max)、MTV分别为3.94±1.06、(2.61±0.70)×10^(4)mm,明显低于预后不良组的4.73±1.21、(3.05±0.93)×10^(4)mm,差异均有统计学意义(P<0.05);经ROC曲线分析结果显示,SFA、BMD、VFA、MA、SUV_(max)、MTV联合预测手术联合NAC治疗早期乳腺癌患者预后的AUC分别为0.898 (95%CI:0.809~0.954)、0.919 (95%CI:0.836~0.968)。结论 NAC过程中检测QCT参数、^(18)F-FDG PET/CT显像指标可预测手术联合NAC治疗早期乳腺癌患者的预后,联合预测的价值较高。

F-粗糙集的拓展与应用

F-粗糙集是第1个动态粗糙集模型,具有良好的兼容性、表达能力以及动态性,但绝大多数粗糙集模型动态性不足.为了明晰粗糙集模型的动态性,拓展F-粗糙集的应用,综述了F-粗糙集研究的现状和发展,证明了多粒度粗糙集、多粒度邻域粗糙集和多尺度信息系统中的粗糙集可以用F-粗糙集表示.此外,还研究了F-粗糙集的可拓性,并建议将其他粗糙集模型与F-粗糙集相结合,使它们在处理动态数据、增量数据和海量数据时具有更强的能力.研究结果将提高其他粗糙集模型的动态性,有利于粗糙集进一步应用到大数据领域.

F-35平尾喷流效应和机动性

本研究主要探讨F-35的平尾喷流效应。根据公开数据,在不高估性能的前提下,建立F-35的动力学模型并进行仿真,将仿真结果与F-35的飞行测试记录进行比较,并且和其他高机动性机型进行比较。仿真结果表明,仿真与飞行测试记录吻合,喷流效应对F-35机动性有较为明显的提升。

^(18)F-FDG PET/CT 联合 CEA 在诊断结直肠癌分化程度中的价值分析

目的探讨^(18)F-脱氧葡萄糖(^(18)F-FDG)正电子发射计算机断层显像(PET/CT)联合癌胚抗原(CEA)诊断结直肠癌分化程度的价值。方法选取85例结直肠癌患者,均接受^(18)F-FDG PET/CT、CEA检查,以内镜活检或术后病理结果为金标准,通过受试者工作特征曲线(ROC)分析^(18)F-FDG PET/CT、CEA单独及联合诊断结直肠癌的价值。结果内镜活检或术后病理诊断85例结直肠癌患者中,结肠癌60例,直肠癌25例;高分化38例,中分化26例,低分化21例。不同分化程度结直肠癌患者SUVmax值、CEA值对比,低分化>中分化>高分化,差异有统计学意义(P<0.05)。ROC曲线显示^(18)F-FDG PET/CT、CEA参数单独及联合诊断结直肠癌分化程度的曲线下面积(AUC)值分别为0.768、0.810、0.862,联合诊断价值高。结论^(18)F-FDG PET/CT联合CEA诊断结直肠癌分化程度的临床价值较高。

An insight on the mechanism of efficient leaching of vanadium from vanadium shale induced by microwave-generated hot spots

Microwave heating can rapidly and uniformly raise the temperature and accelerate the reaction rate.In this paper,microwave heating was used to improve the acid leaching,and the mechanism was investigated via microscopic morphology analysis and numerical simulation by COMSOL Multiphysics software.The effects of the microwave power,leaching temperature,CaF_(2) dosage,H_(2)SO_(4) concentration,and leaching time on the vanadium recovery were investigated.A vanadium recovery of 80.66%is obtained at a microwave power of 550 W,leaching temperature of 95℃,CaF_(2) dosage of 5wt%,H_(2)SO_(4) concentration of 20vol%,and leaching time of 2.5 h.Compared with conventional leaching technology,the vanadium recovery increases by 6.18%,and the leaching time shortens by 79.17%.More obvious pulverization of shale particles and delamination of mica minerals happen in the microwave-assisted leaching process.Numerical simulation results show that the temperature of vanadium shales increases with an increase in electric field(E-field).The distributions of E-field and temperature among vanadium shale particles are relatively uniform,except for the higher content at the contact position of the particles.The analysis results of scaleup experiments and leaching experiments indicate high-temperature hot spots in the process of microwave-assisted leaching,and the local high temperature destroys the mineral structure and accelerates the reaction rate.

Comprehensive utilization of complex rubidium ore resources:Mineral dissociation and selective leaching of rubidium and potassium

Currently,the process of extracting rubidium from ores has attracted a great deal of attention due to the increasing application of rubidium in high-technology field.A novel process for the comprehensive utilization of rubidium ore resources is proposed in this paper.The process consists mainly of mineral dissociation,selective leaching,and desilication.The results showed that the stable silicon–oxygen tetrahedral structure of the rubidium ore was completely disrupted by thermal activation and the mineral was completely dissociated,which was conducive to subsequent selective leaching.Under the optimal conditions,extractions of 98.67% Rb and 96.23%K were obtained by leaching the rubidium ore.Moreover,the addition of a certain amount of activated Al(OH)_(3) during leaching can effectively inhibit the leaching of silicon.In the meantime,the leach residue was sodalite,which was successfully synthesized to zeolite A by hydrothermal conversion.The proposed process provided a feasible strategy for the green extraction of rubidium and the sustainable utilization of various resources.

Occurrence,leaching behavior,and detoxification of heavy metal Cr in coal gasification slag

Coal gasification slag(CGS)is a type of solid waste produced during coal gasification,in which heavy metals severely restrict its resource utilization.In this work,the mineral occurrence and distribution of typical heavy metal Cr in CGS is investigated.The leaching behavior of Cr under different conditions is studied in detail.Acid leaching-selective oxidation-coprecipitation method is proposed based on the characteristics of Cr in CGS.The detoxification of Cr in CGS is realized,and the detoxification mechanism is clarified.Results show that Cr is highly enriched in CGS.The speciation of Cr is mainly residual fraction(74.47%-86.12%),which is combined with amorphous aluminosilicate.Cr^(3+)and Cr^(6+)account for 90.93%-94.82%and 5.18%-9.07%of total Cr,respectively.High acid concentration and high liquid-solid ratio are beneficial to destroy the lattice structure of amorphous aluminosilicate,thus improving the leaching efficiency of Cr,which can reach 97.93%under the optimal conditions.Acid leaching-selective oxidation-coprecipitation method can realize the detoxification of Cr in CGS.Under the optimal conditions,the removal rates of Fe^(3+)and Cr^(3+)in the leaching solution are 80.99%-84.79%and 70.58%-71.69%,respectively,while the loss rate of Al^(3+)is only 1.10%-3.35%.Detoxification slag exists in the form of Fe-Cr coprecipitation(Fe_(1-x)Cr_xOOH),which can be used for smelting.The detoxification acid leaching solution can be used to prepare inorganic polymer composite coagulant poly-aluminum chloride(PAC).This study can provide theoretical and data guidance for detoxification of heavy metal Cr in CGS and achieve resource utilization of coal gasification solid waste.