effects of modulus and dosage of sodium silicate on limestone limestone jjf

Characterisation of reactive magnesia and sodium …

2017-2-26 · 6 118 limestone by reactive MgO remarkably increased the early strength and slightly increased the 119 28-day strength. The effect of MgO reactivity on the strength, shrinkage, and microstructure 120 of sodium silicate and sodium carbonate-activated slag was studied by [29–31]. They found 121 that adding reactive MgO into the AAC can effectively reduce the drying shrinkage and

(PDF) Effects of modulus and dosage of sodium silicate on ...

Similarly, Rao et al., [7] studied the effects of modulus and dosage of sodium silicate on Jayantipuram limestone mine, Andhra Pradesh limestone flotation. Rao et al., [20] …

Influence of sodium silicate modulus and dosage on % …

Download scientific diagram | Influence of sodium silicate modulus and dosage on % CaO of froth concentrate from publication: Effects of modulus and dosage of sodium silicate on limestone ...

Effects of modulus and dosage of sodium silicate on ...

The analysis of variance (ANOVA) statistical tool was used for evaluation of the influence of operating parameters, viz. the modulus and dosage of sodium silicate, on the flotation. The study indicated that a modulus of 2.19 and a dosage of 0.6 kg/ton is optimum for the flotation for the low-grade siliceous limestone sample

A Study on Water Absorption and Sorptivity of …

2019-1-24 · Fly Ash ratio =0.4, Sodium Silicate to Sodium Hydroxide ratio =2.0, Molarity=M14, Curing temperature =75 0 C, Curing Time = 24hours, Rest Period = 1day, Admixture Dosage =2% were kept constant during the tests. The main objective of the study was to …

Maejo Int. J. Sci. Technol. Maejo International Journal of ...

2015-2-3 · Effects of modulus and dosage of sodium silicate on limestone flotation Danda S. Rao1,*, Tadiparthi V. Vijayakumar2, Shivakumar Angadi1, Swarna Prabhakar2 and Guntamadugu B. Raju2 1 Institute of Minerals and Materials Technology, Bhubaneswar - 751 013, Orissa, India

INFLUENCE OF C A ADMIXTURE ON SETTING …

2011-4-8 · Dried sodium silicate was purchased from Henkel AG under the brand name Portil A. The chemical composition of sodium silicate was (wt.%): SiO2 50.75, Na2O 26.78, H2O 22.47 with a silicate modulus (SiO2/Na2O) equal to 1.95. Calcium aluminate C12A7 (mayenite) was prepared by a solid-state reaction of limestone and alumina (Alcan). Powdered

Effectiveness of sodium silicate as gangue depressants in ...

2011-10-4 · The recovery of iron from the screw classifier overflow slimes by direct flotation was studied. The relative effectiveness of sodium silicates with different silica-to-soda mole ratios as depressants for silica and silicate bearing minerals was investigated. Silica-to-soda mole ratio and silicate dosage were found to have significant effect on the separation efficiency. The results show that ...

Sodium silicate coated wood

2010-10-23 · sodium silicate solution w as prepared using a high shear mixer with corresponding weight percent shown in Table 1. A model L4RT-A of Silverson high shear mixer was used to mix the cellulose nanofibrils into the sodium silicate solution at room temperature for 8 min at 5500 RPM.

Effects of modulus and dosage of sodium silicate on ...

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Journal of Chemical and Pharmaceutical Research, 2014, …

2021-3-19 · Alkaline activator modulus Referring GB / T 4209-2008 "industrial sodium silicate" norms of China to test the sodium silicate modulus, and get the Na2O Mass Fraction is 24.12%, the SiO2 Mass Fraction is 73.08%, so the the sodium silicate modulus is 3.03 (73.08%/ 24.12%). Solid content of the water glass liquid is 37.5%. The table 2 is the ...

EFFECT OF SODIUME OXIDE ON THE PROPERTIES OF …

2021-3-1 · evaluated. Sodium oxide (Na2O %) range between (4% - 8%) and constant silica modulus (0.5). The water/solid ratio was kept constant (0.4) and the needed water is calculated for each mixture. The solid weight includes the binder weight and the solid weight of activator (NaOH and sodium silicate).

(PDF) Effect of the particle size on flotation performance ...

In this investigation, the effectiveness of sodium silicates of different values of modulus (silicato soda ratio) and dosage was investigated on a low-grade siliceous limestone sample having CaO ...

Chemical and physical effects of high-volume limestone ...

2021-7-19 · The current study aims at using high-volume of LS (up to 50 wt%) to replace the GGBS in AASC. To achieve this, the general properties (fluidity, setting time, and mechanical properties) and drying shrinkage (one of the main drawbacks of AASC ) of the obtained mixtures or hardened matrixes.Microstructural analysis, including pore structure, phase assemblage, and morphology are …

Chemical and physical effects of high-volume limestone ...

Chemical and physical effects of high-volume limestone powder on sodium silicate-activated slag cement (AASC) ... Limited new phase was formed in the sodium silicate activated slag samples, which was believed to depend on the modulus of the activator. Around 30% hydration degree of LS was achieved in 40 wt% LS-replaced AAS pastes hydrated for 7 ...

Minerals | Free Full-Text | Review on Beneficiation ...

Generally, the modulus and dosage of sodium silicate have a great impact on the depression of quartz occurred in flotation process . The depression of quartz caused by adding NaHCO 3 in the pulp was also observed in both the cationic flotation using amine and the …

Effect of alkali dosage and silicate modulus on ...

2018-11-1 · The effects of alkali dosage and silicate modulus on the total porosity and average pore size of the AAS mortars after 48 h of steam curing and 56 days of carbonation are shown in Fig. 5. The results show that the pores of the AAS mortars are denser at higher alkali dosage and silicate modulus.

(PDF) Nanda-Thesis | Nanda Kishore Patra

The approximate composition of dolomite is calcium 64-75%, Magnesium 9-14%, Potassium 7-10%, and Sodium less than 7%. Most of the dolomite produced in the country is utilised in steel plants. The production from Gujarat is pulverised into chips, while from Uttaranchal (Dehra Dun) is consumed in Naya Nangal fertilizer plant.

Assessing the porosity and shrinkage of alkali activated ...

2019-12-3 · sodium hydroxide (pellets, analytical level of 99 wt.%) and commercial sodium sil-icate solution (27.69% SiO 2, 8.39% Na 2O and 63.92% H 2O by mass) was used, due to the advantages in providing additional silicate and continuous alkali conditions of this activator. The desired activator modulus (Ms, SiO 2/Na 2O molar ratio) was

Modified blended limestone-Portland cement binders ...

2021-4-1 · One-part blended cements with 65% limestone and 35% Portland cement (PC) were activated by 3–8%wt. of four powdered sodium silicates of different modulus SiO 2 /Na 2 O = 1–3.26. Pastes were cured at 20 °C for 180 days in dry and underwater conditions.

Effect of Sodium Hydroxide Concentration on Various ...

2017-8-24 · Sodium Hydroxide (NaOH) was purchased from V.K Chemicals & Instruments Ambala and Sodium Silicate (Na 2 SiO 3) was purchased from Ambala Silicate Udyog were used. Sodium hydroxide in pellets form with 98% purity and Sodium silicate solution having composition of SiO 2 = 30.04%, Na 2 O = 9.5% and water = 60.1% by mass were used

Effect of sodium silicate on Portland cement/calcium ...

Effect of sodium silicate on Portland cement/calcium aluminate cement/gypsum rich-water system: strength and microstructure. Zhiming Wang ab, Yuning Sun * ab, Shuo Zhang a and Yonglong Wang a a School of Energy Science and Engineering, Henan …

MECHANICAL AND MICROSTRUCTURAL PROPERTIES OF …

2021-3-11 · the Young''s modulus of elasticity (9.1 GPa) was reached using 10 M NaOH. A further increase in the alkaline (NaOH) dosage to 13 M slightly reduced the modulus of elasticity of the geopolymer mortar (Figure 3). The same behaviour of the fly-ash-based geopolymer mortar was observed with the change in the silicate dosage (Figure 4). The fly-ash ...

Effect of sodium silicate on the reverse anionic flotation ...

2016-5-30 · It was shown that using sodium silicate at the selected levels of parameters including: dosage of 800 g/t, pulp pH of 10, sodium silicate modulus of 2.5, and solution conditioning time of 6 min, improved the selectivity of the apatite/iron oxides flotation significantly, but the silica content of the iron concentrate was still higher than required.

Effect of Local Materials on Self Compacting Concrete

2019-7-1 · mix with the limestone powder had confirmed that the incorporation of granite fines requires high dosage of super plasticizer for the similar yield stresses and rheological properties. Self compacting concrete requires high powder contents or the addition of suitable viscosity modifying agent (VMA) to increase the segregation.

Effect of fibre dosage and stress-strength ratio on creep ...

2021-10-1 · Mixture. Four mixtures were produced and subjected to tests: a control group (plain AAS) concrete and three PP fibre groups. The plain AAS used in our previous experimental study exhibited high mechanical strength [].The proportions of each component were as follows: water–binder ratio of 0.5, SiO 2 /Na 2 O ratio (modulus) of 1.2, sodium silicate dosage of 15% (slag mass), slag sand ratio of ...

The effect of triethanolamine and limestone powder on ...

2008-5-30 · the limestone powder(LP) is used in concrete in combination with triethanolamine (TEA) as an accelerator the hydration and hardening process of Portland cement is likely changed. This study reported the results of the authors'' research on the effect of …

Mechanical Properties and Flexural Performance of ...

2017-6-28 · material and its main process to activate the sodium silicate Pellet Sodium Hydroxide is recommended to use the lowest cost i.e. up to 94% to 96 % purity. Fig -1: Sodium hydroxide 2.5 Sodium silicate with a concentration of 16 molar consists of 16 x 40 = In present investigation sodium silicate 2.0 (ratio between Na2O to Sio2) is used. A per ...

PERFORMANCE OF ALKALI ACTIVATED SLAG WITH …

The performance of alkali-activated slag concrete with sodium silicate, sodium hydroxide, sodium carbonate as activator are used at 4% Na2O (by weight of slag) and 4% of hydrated lime by total weight of solid binder content if used as a retarder. The scope of the work covered four mixes: - Normal OPC mix and three alkali activated slag mixes of ...

Silicate species of water glass and insights for alkali ...

2015-6-29 · Sodium silicate solutions (Na 2 O ⋅ nSiO 3), commonly also called water glass, are among the most widely used chemicals in industrial products. For instance, water glass is commonly used as binders or adhesives in various applications, to …

EFFECT OF THE PARTICLE SIZE ON FLOTATION …

2011-12-14 · sodium silicate dosage of 1.2 kg/t and sodium oleate reagent dosage of 0.2 kg/t. Similarly, Rao et al., [17] studied the effectiveness of sodium silicates of different silica-soda modulus as depressants on a low grade siliceous limestone sample having CaO 45.10%; SiO2 15.60% and LOI 36.03%. Their studies indicated that the sodium silicate

Effect of various alkalis on hydration properties of ...

2017-11-11 · The effect of sodium silicate (NS system) and sodium hydroxide (NH system) on hydration properties of alkali-activated slag (AAS) cements is investigated, and more attention has been paid to the hydration kinetics in this paper. The increase of Na2O dosage tends to promote higher early strength of the cements, but lower strength gain at later, while increasing SiO2 dosage leads to improve both ...

Effect of Corrosion Inhibitors in Limestone Cement

2013-12-26 · tain 15%, 35% w/w limestone, were produced by inter- grinding of clinker, limestone and gypsum in a pilot plant ball mill of 5 kg capacity. Preliminary tests with varying grinding time have been done in order to produce ce- ments of appropriate compressive strength. The cements, LC1 and LC2, contain 15%, 35% limestone, respectively.

Investigating the Effect of Using Cross-Linked ...

2021-10-5 · limestone aggregate. Moreover, the limestone filler was determined to be 4% by aggregate weight. The limestone aggregates were extracted from the Sidoon mine, 20 Km far from Shahrood, Iran, while the dune sand was provided from Rahsazan Kavir …