International Journal of Mineral Processing最新文献

{"title":"Estimation of hydrophilicity of coals by using the quantum chemistry calculation","authors":"Jie Wang ,&nbsp;Yaqun He ,&nbsp;Zhen Peng ,&nbsp;Xiangyang Ling ,&nbsp;Shuai Wang","doi":"10.1016/j.minpro.2017.07.015","DOIUrl":"10.1016/j.minpro.2017.07.015","url":null,"abstract":"<div><p><span><span><span>The hydrophilicity is an important parameter in characterizing the floatability of coals in floatation. To quantify the hydrophilicity, the quantum chemistry calculation was used to calculate the hydrogen bonding energies in the wetting process by DFT B3LYP 6-31G. It is known that the floatability of </span>lignite is much lower than that of the high-volatile </span>bituminous coal from the natural floatability test. Besides, the hydrophilic sites were mainly oxygen functional groups. From XPS results, it is indicated that there were four kinds of oxygen functional groups, including </span><img>OH, C<img>O, C<img>O and <img>COOH in lignite, while there were three kinds of oxygen functional groups, containing <img>OH, C<img>O and C<img>O in the high-volatile bituminous coal. On the other hand, the simulation results showed that the hydrogen bonding energy of these hydrophilic sites are in the following order<!--> <!-->−<em> <!-->COOH</em> <!-->&gt;<!--> <!-->−<!--> <em>OH</em> <!-->&gt;<!--> <em>C</em> <!-->−<!--> <em>O</em> <!-->&gt;<!--> <em>C</em> <!-->=<!--> <em>O</em>. The released hydrogen-bonding energies were calculated to be 2.36<!--> <!-->kcal/mol for lignite and 1.31<!--> <!-->kcal/mol for high-volatile bituminous coal, respectively. In addition, the calorimetric experiments also showed that the wetting heats were 105.37<!--> <!-->J/g (lignite) and 47.00<!--> <span>J/g (high-volatile bituminous coal). The hydrogen bond energy distribution of each hydrophilic sites showed that all the four kind hydrophilic sites impacted the lignite hydrophilicity remarkably whereas only </span><img>OH and C<img><span>O affected the hydrophilicity of high-volatile bituminous coal. It was revealed that the difficulty in lignite flotation was dominated by the complex contribution to hydrophilicity of the oxygen functional groups.</span></p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"167 ","pages":"Pages 9-15"},"PeriodicalIF":0.0,"publicationDate":"2017-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.07.015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44833866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An extension of Free's extraction isotherm for the solvent extraction of cations using acidic extractants","authors":"V. Agarwal,&nbsp;M.S. Safarzadeh,&nbsp;J. Galvin","doi":"10.1016/j.minpro.2017.08.005","DOIUrl":"10.1016/j.minpro.2017.08.005","url":null,"abstract":"<div><p><span><span>A simple theoretical model has been developed for the solvent extraction of cations with different </span>oxidation states varying from +1 to +4 using acidic extractants. The basic assumption behind this theoretical model is that the cationic species (M</span>ⁿ⁺<span>) will exist in ionic form and not form any complexes in the aqueous phase. A direct relationship between the concentration of metal ions in the aqueous phase and that in the organic phase was developed for trivalent and tetravalent cationic species. Using this model, the distribution isotherms were plotted for a given set of conditions. The effect of pH and equilibrium constant on the distribution isotherms were represented in three-dimensional form for trivalent and tetravalent cationic species. Consistent with expectations, the results suggest that with increasing pH and an increasing equilibrium constant one finds an enhancement of the extraction of cationic species for a given set of conditions. The calculations were performed in the pH range of 1 through 3 because for higher pH values, the pH shift accompanying the extraction is significant and thereby affects the mass balance equations. A comparison of the distribution isotherms shows that the total metal ion concentration to extractant concentration ratio determines the distribution behavior of metal ions with different valency. At low total metal ion concentration to extractant concentration ratio, the distribution coefficient was higher for higher oxidation state cations under similar experimental conditions, and this trend started to reverse when the total metal ion concentration to extractant concentration ratio was increased.</span></p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"167 ","pages":"Pages 86-94"},"PeriodicalIF":0.0,"publicationDate":"2017-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.08.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47483001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Scale-up rules for flocculation","authors":"Radek Šulc,&nbsp;Pavel Ditl","doi":"10.1016/j.minpro.2017.08.003","DOIUrl":"10.1016/j.minpro.2017.08.003","url":null,"abstract":"<div><p>We present here a study of three baffled tanks, 0.15<!--> <!-->m, 0.20<!--> <!-->m and 0.30<!--> <span>m in inner diameter, agitated by Rushton turbine, with reference to scaling up the flocculation kinetics. A clay slurry was used as a model wastewater. The experiments were carried out at mixing intensity 40</span> <!-->W/m³ and clay concentration 0.58<!--> <!-->g/L. The model wastewater was flocculated with the Sokoflok 16A organic flocculent (solution 0.1<!--> <!-->wt%) in the range of dimensionless flocculent dosage D_F^⁎ from 0.448 to 5.241<!--> <!-->mg/g. The flocs that formed were separated by means of sedimentation. The operational conditions were designed according to following proposed scale-up rules: i) P/V<!--> <!-->=<!--> <!-->const., ii) t_F^⁎ <!-->=<!--> <!-->N·t_F <!-->=<!--> <!-->const., iii) D_F^⁎ <!-->=<!--> <!-->const. and iv) u_sed <!-->=<!--> <span>const. Applying the proposed scale-up rules, the flocculation efficiency was found to be practically the same irrespective of vessel size and flocculation dosage. For the given flocculated system and process conditions, the maximum degree of turbidity removal Z</span>_e^⁎_max <!-->=<!--> <!-->96.1<!--> <!-->±<!--> <!-->0.6% was found for dimensionless flocculation time 1916<!--> <!-->±<!--> <!-->5% and dimensionless flocculent dosage D_F^⁎ <!-->=<!--> <!-->3.128<!--> <!-->mg/g<!--> <!-->±<!--> <!-->8%, regardless of vessel size. The approach to scale-up proposed by Camp (1955) is discussed and criticized in the light of present-day mixing theory, and an explanation is offered of the shortcomings of this approach, and why it gives incorrect scale-up results.</p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"167 ","pages":"Pages 79-85"},"PeriodicalIF":0.0,"publicationDate":"2017-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.08.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45345166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of cations Ca2 +, Mg2 + and Zn2 + on the flotation and surface charge of smithsonite and dolomite with sodium oleate and sodium silicate","authors":"Ana Carolina Arantes Araújo,&nbsp;Rosa Malena Fernandes Lima","doi":"10.1016/j.minpro.2017.08.001","DOIUrl":"10.1016/j.minpro.2017.08.001","url":null,"abstract":"<div><p><span>This study aimed to determine the conditions required for selective flotation<span> between smithsonite and dolomite using sodium oleate and sodium silicate. Microflotation test results demonstrated recoveries of 95% and 5% for smithsonite and dolomite, respectively, from 2.5</span></span> <!-->×<!--> <!-->10^{−<!--> <!-->5} <!-->M sodium oleate and 50<!--> <!-->mg/L sodium silicate at pH<!--> <!-->9.5. The smithsonite was depressed by the cations Ca^{2<!--> <!-->+} and Mg^{2<!--> <!-->+} and, the dolomite was depressed by Zn^{2<!--> <!-->+} cations, which was probably caused by the reaction of these cations with the oleate anions in the solution, decreasing the concentration of collector available for adsorption onto the minerals. The powerful depression of smithsonite caused by Ca^{2<!--> <!-->+} cations compared with that caused by Mg^{2<!--> <!-->+} cations can be considered to have occurred because of the higher concentration of Ca^{2<!--> <!-->+}<span> in the solution. From the zeta potential measurements at pH</span> <!-->9.5, we concluded that the predominant species of oleate and of sodium silicate were adsorbed onto both minerals, and the silicate species prevented the adsorption of oleate anions onto dolomite. The decrease in the negative zeta potential of both minerals after cation conditioning can be related to the electrostatic attraction between the cations and the negative sites on their surfaces. The negative zeta potential of smithsonite increased at a concentration of 1<!--> <!-->×<!--> <!-->10^{−<!--> <!-->6} <!-->M Ca^{2<!--> <!-->+} and Mg^{2<!--> <!-->+}, whereas the potential decreases at a concentration of 1<!--> <!-->×<!--> <!-->10^{−<!--> <!-->3} <!-->M, which can be related to a lower concentration of oleate anions being available for adsorption.</p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"167 ","pages":"Pages 35-41"},"PeriodicalIF":0.0,"publicationDate":"2017-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.08.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47080976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of acid surface dissolution pretreatment on the selective flotation of ilmenite from olivine and pyroxene","authors":"Parisa Semsari Parapari,&nbsp;Mehdi Irannajad,&nbsp;Akbar Mehdilo","doi":"10.1016/j.minpro.2017.07.017","DOIUrl":"10.1016/j.minpro.2017.07.017","url":null,"abstract":"<div><p><span><span>The influence of acid surface dissolution as a pretreatment method on the improvement of </span>ilmenite<span> selective flotation from olivine-pyroxene was studied by carrying out the flotation experiments in micro and laboratory (flotation cell) scales. The microflotation experiments show that after surface dissolution, the flotation recovery of ilmenite improves from 73.5% to 92.1% at a pH of 6.3, while that of olivine-pyroxene decreases from 59.6% to 44.6%. The improvement of ilmenite floatability is in good accordance with the relative content of Fe</span></span>^{3<!--> <!-->+}<span><span> in ilmenite surface which increases from 48.5% to 59.8% after surface dissolution as evidenced by XPS analysis. This conversion increases the formation of an insoluble layer of ferric iron oleate, and enhances ilmenite hydrophobicity. FTIR spectra and </span>zeta potential measurements indicated that the adsorption of oleate ions on the surface of olivine-pyroxene decreases significantly after surface dissolution. As evidenced by ICP analysis, this can be due to the dissolution of Fe cations as the active sites from the olivine-pyroxene surface. The cell flotation experiments show that before surface dissolution, an optimal concentrate with 21.2% TiO</span>₂ and 78.3% recovery is achieved using 1000<!--> <!-->g/t sodium oleate, 100<!--> <!-->g/t Pb(NO₃)₂ (activator) and 80<!--> <!-->g/t quebracho (depressant). After surface dissolution, the best concentrate containing 25.6% TiO₂ and 80.6% recovery is obtained in the presence of 1000<!--> <!-->g/t collector and 100<!--> <span>g/t activator without any depressant agent. As a general result, the acid surface dissolution pretreatment enhances the selectivity of ilmenite flotation and its separation efficiency.</span></p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"167 ","pages":"Pages 49-60"},"PeriodicalIF":0.0,"publicationDate":"2017-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.07.017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47734628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect and mechanism of phosphoric acid in the apatite/dolomite flotation system","authors":"Xing Liu ,&nbsp;Yaoyang Ruan ,&nbsp;Chengxiu Li ,&nbsp;Renju Cheng","doi":"10.1016/j.minpro.2017.08.006","DOIUrl":"10.1016/j.minpro.2017.08.006","url":null,"abstract":"<div><p><span>To elucidate how phosphoric acid (H</span>₃PO₄<span>) as a depressant achieves selective separation of apatite<span> and dolomite, the flotation response of these minerals was investigated using both single and mixed mineral flotation. Microflotation results demonstrated that H</span></span>₃PO₄<span> exhibits a selective depressive effect on apatite. Flotation kinetics analyses also revealed that the presence of H</span>₃PO₄<span> increases the dolomite/apatite selectivity<span> index significantly. The adsorption mechanisms were examined using zeta potential tests, X-ray photoelectron spectroscopy, solution chemistry analysis, and thermodynamic analysis. H</span></span>₂PO₄⁻ was found to be the pivotal ion for depressing apatite under slightly acidic conditions (pH<!--> <!-->=<!--> <!-->5.0–6.0), where the separation of these minerals most effective. H₂PO₄⁻ reacts with free Ca^{2<!--> <!-->+} to depress the acidolysis of apatite and promote the formation of aqueous CaHPO₄. H₃PO₄ chemisorbs onto apatite surface by the formation of aqueous CaHPO₄ and Ca(H₂PO₄)₂, with the former being the major species to depress apatite. Moreover, dissolution of Mg^{2<!--> <!-->+} and Ca^{2<!--> <!-->+} from the dolomite surface is thermodynamically more favorable than that of Ca^{2<!--> <!-->+} from the apatite surface. As Mg(H₂PO₄)₂ is soluble, H₃PO₄ only exhibits a weak depressive effect on dolomite. Further, the collector (sodium oleate) maintains excellent dolomite floatability in the presence of H₃PO₄<span>, because chemisorption of the collector on the dolomite surface is enhanced by reaction with abundant Mg</span>^{2<!--> <!-->+}. Therefore, H₃PO₄ selectively depresses apatite in the apatite/dolomite flotation system.</p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"167 ","pages":"Pages 95-102"},"PeriodicalIF":0.0,"publicationDate":"2017-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.08.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44560509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Separation of Co(II) and Ni(II) from chloride leach solution of nickel laterite ore by solvent extraction with Cyanex 301","authors":"Ling Yun Wang ,&nbsp;Man Seung Lee","doi":"10.1016/j.minpro.2017.07.004","DOIUrl":"10.1016/j.minpro.2017.07.004","url":null,"abstract":"<div><p><span>A hydrometallurgical process was developed to recover Co(II) and Ni(II) from the chloride leach liquor of laterite ore. Most of Co(II) and Ni(II) together with a small amount of Al(III) were selectively extracted over other elements by Cyanex 301 from the feed solution at pH 1 which contained Co(II), Ni(II), Al(III), Ca(II), Mg(II) and Mn(II). From the loaded Cyanex 301, Co(II) and Al(III) were selectively stripped by 3 M HCl solution, and then Ni(II) was completely stripped by 10</span> <span>M HCl solution. The McCabe-Thiele plots for the extraction and stripping isotherms were constructed. Batch simulation experiments for the counter-current extraction and stripping indicated that the recovery percentage of Co(II) and Ni(II) was 92.6 and 95.7%, respectively. Moreover, the purity of Ni(II) in the stripping solution was reached 99.5%. A process flowsheet for the recovery of Co(II) and Ni(II) from the laterite leach liquor was proposed.</span></p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"166 ","pages":"Pages 45-52"},"PeriodicalIF":0.0,"publicationDate":"2017-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.07.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46348139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of filling interval time on the mechanical strength and ultrasonic properties of cemented coarse tailing backfill","authors":"Shuai Cao,&nbsp;Weidong Song","doi":"10.1016/j.minpro.2017.07.005","DOIUrl":"10.1016/j.minpro.2017.07.005","url":null,"abstract":"<div><p><span>An experimental study is conducted to investigate the effect of filling interval time (FIT) on the uniaxial compressive strength (UCS) and ultrasonic pulse velocity (UPV) of cemented coarse tailing backfill (CCTB). A total of 72 CCTB samples with diameter</span> <!-->×<!--> <!-->height of 50<!--> <!-->mm<!--> <!-->×<!--> <!-->100<!--> <!-->mm prepared at different solid contents (70, 72, and 75<!--> <!-->wt%) and water-to-cement ratios (3.00, 2.72, and 2.33) were subjected to UPV and UCS tests at 12, 24, 36 and 48<!--> <!-->h of FIT. The UCS and UPV values of the CCTB samples increased with the increase in the solid content. However, an increase in FIT led to a decrease in the UPV and UCS of the CCTB samples. Different types of curve fittings were conducted to obtain the correlation between UPV and UCS versus FIT at different solid contents. A polynomial function can explain the relationship between UPV and FIT. Moreover, the UCS and UPV values exhibit a linear function. CCTB also shows a failure mode of tensile failure-tensile shear failure transition-tensile and shear mixing failure modes, which provides a theoretical basis for the strength design and stability control of backfills.</p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"166 ","pages":"Pages 62-68"},"PeriodicalIF":0.0,"publicationDate":"2017-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.07.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48181320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Triboelectrostatic separation of pulverized fuel of coal power plant based on mineralogical analyses","authors":"Yaqun He,&nbsp;Weining Xie,&nbsp;Yuemin Zhao,&nbsp;Hong Li,&nbsp;Shuai Wang","doi":"10.1016/j.minpro.2017.06.005","DOIUrl":"10.1016/j.minpro.2017.06.005","url":null,"abstract":"<div><p><span>Associated minerals in the raw coal increase the energy consumption and abrasion of grinding media of vertical spindle pulverizer (VSP). Moreover, the low separating efficiency of classifier in VSP leads to the return of fines to grinding table, worsens the grinding phenomenon and make the energy-size reduction of coal complex. Beneficiation of fines rejected by classifier is helpful to save energy and decreases the air pollution caused by the combustion of minerals in fines. Aiming to evaluate the potential for beneficiating the circulating loads, multi-analytical techniques are utilized to the raw coal and ground products. Phase composition analyses of raw coal show that kaolinite is the main mineral. Comparison of scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDX) of coal before and after comminution illustrates the liberation of kaolinite from coal substance, and the measurement of charge-mass ratios indicates the opposite polarity of tribocharge between coal and minerals, which indicates the separating possibility based on difference in the electric physics. Removal results of minerals from circulating loads by the triboelectrostatic separator vary with product fineness and liberation degrees. The best separation result is obtained on the finest </span>progenies produced with the yield and ash content of clean coal at 61.95% and 18.92%, respectively.</p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"166 ","pages":"Pages 7-12"},"PeriodicalIF":0.0,"publicationDate":"2017-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.06.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45777378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sulphate induced changes in the reactivity of cemented tailings backfill","authors":"Zaid Aldhafeeri,&nbsp;Mamadou Fall","doi":"10.1016/j.minpro.2017.06.007","DOIUrl":"10.1016/j.minpro.2017.06.007","url":null,"abstract":"<div><p><span>The reactivity of cemented paste tailings (CPT) that contains sulphide mineral-bearing tailings is a key parameter that influences its environmental performance and durability. This reactivity can be influenced by several factors, such as the initial sulphate content of the CPT. In this paper, the effect of the initial sulphate content of the CPT on its reactivity is experimentally investigated by conducting oxygen consumption (OC) tests on CPT specimens. Microstructural testing is also conducted on CPT specimens to better understand the mechanisms responsible for the changes in the reactivity of CPT. These specimens are prepared by mixing defined amounts of pyritic tailings (45</span> <!-->wt%), varying proportions of Portland cement type I or Portland cement partially replaced with different types and amounts of mineral admixtures, and mixing water with various sulphate contents (0, 5000, 15,000 and 25,000<!--> <!-->ppm). The samples are cured for 150<!--> <!-->days at room temperature. The results show that regardless of the type of binder, the reactivity of the CPT specimens increases with increasing contents of sulphate except for a sulphate content of 5000<!--> <span>ppm. Also, partial substitution of Portland cement type I with mineral admixtures, such as granulated blast furnace slag or fly ash, reduces the chemical reactivity. Regardless of the initial sulphate content, increasing the cement content and/or replacing cement with mineral admixtures leads to the reduction in the reactivity of the paste.</span></p></div>","PeriodicalId":14022,"journal":{"name":"International Journal of Mineral Processing","volume":"166 ","pages":"Pages 13-23"},"PeriodicalIF":0.0,"publicationDate":"2017-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.minpro.2017.06.007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44393520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}