chromite compressive strength

(PDF) Sodium Silicate Cold-Bonded Chromite …

It was determined that pellets cured at 75 °C had compressive strengths of 2.41-3.12 kN. The mechanical strength of these cold-bonded pellets where similar to, or exceed that of pellets currently ...

Compression strength of pellets under wet and dried …

The binding mechanism is based on the combined effects of sodium silicate and geopolymerization. It was determined that pellets cured at 75 °C had compressive strengths of 2.41-3.12 kN. The ...

Recycling Of Chromite Waste for Concrete: Full Factorial Design

The compressive strength test, split tensile strength test, and flexural strength test were conducted and compared with conventional concrete for 7- and 28-days curing, study's results showed an ...

Chromium

Yield strength or yield stress is the material property defined as the stress at which a material begins to deform plastically whereas yield point is the point where nonlinear (elastic + plastic) deformation begins. See also: Strength of Materials. Ultimate Tensile Strength of Chromium. Ultimate tensile strength of Chromium is 550 MPa.

Estimating effect of chrome ore granulometry on sintered …

Chromite ore pellets are used for ferrochrome production by the smelting reduction process. The strength and porosity of the sintered pellets play a significant role in smelting reduction. ... The drop test, compressive strength and porosity of sintered pellet samples from plant and laboratory tests were evaluated. Mathematical correlations of ...

Ferrochrome slag: A critical review of its properties, …

Ferrochrome slag (FCS) is a by-product of ferrochrome industries and is produced during the extraction of ferrochrome from chromite ore. The chemical composition of FCS comprises of 27–33% SiO 2, 15–25% Al 2 O 3, 20–35% MgO, and 10–15% iron-chromium compounds.The high chromium content of FCS and the …

Usage of chromite wastes as aggregate in concrete

The chromite enrichment wastes obtained from Fethiye, Köyceğiz, Denizli and Burdur regions were used as aggregates in the production of ed concrete. In this study, compressive strength experiments were carried out according to TS EN 1354, thermal conductivity experiments were carried out according to TS EN 12664.

Detoxification and immobilization of chromite ore

Modulus refers to the mole ratio of SiO 2 and Na 2 O in the alkali activators (water glass and sodium hydroxide). The compressive strength increased with increment of modulus up to a certain value, and further increase caused the decline in strength which could be seen in Fig. 1 (a).Highest compressive strength of 112.92 MPa was observed …

Preparation of Black Ceramic Tiles Using Waste Copper …

The compressive strength of the black ceramic tile at optimum sintering conditions exceeds the minimum compressive strength of the Chinese national standard for standard polished tiles, and the concentrations of harmful elements, for example, Cr, Cu, Ni, As, Zn, Pb, and Cr(VI) are within the regulation thresholds specified by the Chinese ...

Chromite

Up to 60 wt.% of COPR was effectively immobilized in BFS-based GP with leaching concentration less than 2 mg/L and compressive strength of 18.5 MPa ( Huang et al., …

IMPROVING THE PELLETIZATION OF CHROMITE …

compressive strength of 2917N/pellet and good metallurgical performances, have been . manufactured. The mechanism of HPGR reveals that chromite particle surface turns to more . irregular after HPGR treatment and more new. surface being formed because of more cracks, sharp corners and edges appearing, resulting in h. igher surface chemical …

The Effect of Carbonaceous Reductant Selection on …

In this study, the effects of carbonaceous reductant selection on chromite pre-reduction and cured pellet strength were investigated. Multiple linear regression …

Solidification/stabilization of chromite ore processing …

Chromite Ore Processing Residue (COPR) produced in chromium salt production process causes a great health and environmental risk with Cr(VI) leaching. ... The compressive strength of the samples were measured according to Chinese National Standard GB/T 17671-1999 (CN-GB, 1999) on a universal testing machine (AGN-250, …

Minerals | Free Full-Text | An Overview of …

Chromite briquettes have lower compressive strengths and lower Cr recovery during smelting when compared to sintered/pre-reduced pelletized chromite . Thus, only pelletization processes were …

Hydrogen-based pre-reduction of chromite: Reduction and …

In the present study, hydrogen-based pre-reduction experiments of chromite were carried out by varying the H 2 :CO ratio of reducing gas, reduction temperature, and duration. The degree of Fe metallization, Fe 2+ degree, and compressive strength of …

Classification of Bricks | Types of Bricks.

Its compressive strength shall not be less than 70 kg/cm 2, and absorption value should not be greater than 22 percent when soaked for 24 hours in water. ... Raw material used for these Fire Bricks is a mineral called CHROMITE. The mineral is double oxide of chromium and iron in its composition. These types Refractory bricks are capable of ...

Key Properties Of Refractory Materials

Chromite and zirconia are common examples of widely used refractory materials and have a melting point of 1,700 to 2,000 °C and well in excess of 2,000 °C respectively. Mechanical or compressive strength rarely contributes to thermal conductivity. ... Compressive strength is important too in the manufacture of the refractory, not just when ...

Control of the Strength Properties of Mixtures Based on …

According to the process sample, the compressive strength of chromite mixture is an average of 1,5 MPa after 1 h; 2,5 MPa after 3 h; 3,5 MPa after 24 h. The …

Sodium Silicate Cold-Bonded Chromite Pellets …

Chromite pellets containing 3 wt% sodium silicate-3 wt% SiO 2-1 to 4 M KOH solution and cured at 75°C for 24 h had compressive strengths of between 2.56 ± 0.44 and 3.12±0.1 kN, exceeding the compressive …

Compressive Strength and Creep Behavior of a Magnesium Chromite …

The compressive strength of a magnesium chromite refractory in nitrogen was measured by rapidly loading specimens to failure at several temperatures up to 1600 O C. Strength retrogression was observed at temperatures above 1200°C. The creep behavior of the refractory in nitrogen was measured as a function of compressive stress in the range …

Chromite Sand Testing

Typical Chromite Sand Testing • South African Chromite Sand is the world standard for metalcasting and foundry applications, however there can ... • Transverse tensile strength and compressive strength can also be measured and is more commonly seem in Europe and Asia. Gauge on tensile testing equipment and standard AFS tensile specimens .

Chromium

A possible crystal structure of Chromium is body-centered cubic structure. In metals, and in many other solids, the atoms are arranged in regular arrays called crystals. A crystal lattice is a repeating pattern of mathematical points that extends throughout space. The forces of chemical bonding causes this repetition.

Full article: An investigation of the porosity dependent strength …

The Portland Cement Association (PCA) specifies a minimum compressive strength of 2.4 MPa for mortar cement type O used for bricks, blocks and stone masonry construction (PCA, Citation 2002). Results in Figures 6 – 9 show that all tailings matrices pass this lower limit strength indicating their viability for certain structural applications.

Insight into the Consolidation Mechanism of Oxidized Pellets …

Effect of mass proportion of chromite concentrates on the compressive strength of the fired pellets. Conditions of raw materials: MP-no pretreatment; CMP-1, CMP-2, CP-HPGR pretreatment, the SSA value of pellet feeds are 1800–1900 cm 2 /g. All fired pellets were manufactured by preheating at 1323 K (1050 °C) for 9 min and firing at …

(PDF) Briquetting Fine Chromite Concentrates

The results demonstrate that compressive strength values of about 196 and 182 MPa after two days of hot curing can be achieved when replacing 50% and of QS with GS, respectively, compared to ...

Comparison of physical properties of oxidative sintered

A statistical evaluation of the cured (sintered) compressive strengths proved that pellets prepared from UG2 ore are likely to have the same, or better, compressive strength than pellets prepared from metallurgical-grade chromite ore. The cured abrasion strength of the UG2 pellets was also superior to that of the metallurgical-grade pellets.

Detoxification and immobilization of chromite ore

The solidified product has a great compressive strength for construction purpose. ... In addition to industrial benefits, chromium production results in generation of hazardous waste called chromite ore processing residues (COPR). The hazardous/toxic nature of COPR is due to presence of Cr(Ⅵ) which is highly carcinogenic and mutagenic …