the chromite mineral in the raw material in respect of kinetic reasons (retention time in smelting). 1. INTRODUCTION ... Th e factors studied were as follows: sintering temperature, compressive strength, degree of oxidation (e.g. sesqui oxide content), …
The compressive strengths of MGCSx specimens are shown in Fig. 2. The compressive strength of pure MG is 65 MPa. With the molar ratio of S 2− /Cr(VI) increasing from 4 to 10, the compressive strengths of MGCSx specimens decrease from 59 MPa to 42 MPa (Fig. 2). Therefore, the addition of Na 2 S reduces the compressive strength of MGCSx …
The compression strength of the stone is carried out to determine the compressive strength of the stone. To perform this test take 6 test blocks of dimensions 10cmx10cmx10cm are taken. These blocks are then covered with plaster of Paris subjected to load in the compression testing machine one by one.
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 …
experiments, the compressive strength of the solidied bodies consistently remained above 80 MPa, and fi the leaching of hexavalent chromium was below the limit (5 mg L−1).
The research primarily investigates the reduction behavior and compressive strength of chromite pellets in atmospheres based on methane and hydrogen. The findings indicate that the reduction of ...
Based on the findings in Fig. 5, the compressive strength decreases with higher Fe metallization, possibly due to the reduced binder quantity and the oversized metal Fe grains. …
The compressive strength of the solidified specimens in the control group reached a maximum value (99.21 MPa) after 10 freeze–thaw cycles, and a minimum value (86.91 MPa) after 50 freeze–thaw cycles. Moreover, the compressive strength of the solidified bodies after the other numbers of cycles did not change significantly (<4%).
At 11% moisture content the desired grade pellets were obtained. These pellets were kept in the carbolite furnace at an average heating rate of 20 °C/min and were retained for 1 h at 1300 °C for heat treatment. Then the naturally cooled pellets were collected and divided in two parts for compressive strength and porosity tests.
The result indicated that the high-temperature environment had much more effect on the solidified body than the freeze–thaw cycle environment in these four aspects: after being maintained at 900 °C for 2 h, the …
Parameters such as compressive strength, flexural strength, and tensile strength were studied, which were determined using standard methods. Mathematical models …
The compressive strength of a magnesium chromite refractory in nitrogen was measured by rapidly loading specimens to failure at several temperatures up to 1600OC. Strength retrogression was ...
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 from 1.4 to 5. 6 …
Preparation and application of alkali-activated cementitious materials in solidification/ stabilization of chromite ore processing residue† Pengyue Su,‡a Pan Zhao,‡a Hao Wang,a Kun Zhou,a Yicheng Guo,a Sha Liu,a Huicheng Lu,a Haiyu Chen,a Lanjun Zhang,a Ziqiang He,e Ming Xia *abc and Shujie Zhao*d Chromite ore processing residue (COPR) is a typical hazardous …
Behavior and Pellet Compressive Strength SHAOWEN WU,1 XIAOMING FENG,2 YANLING ZHANG,1,3 LIQUN MA,1 and YUE LI1 1.—State Key Laboratory of Advance Metallurgy, University Science and Technology of ... and compressive strength of chromite pellets in atmospheres based on me-thane and hydrogen. The findings indicate that the reduction of …
The uniaxial compressive strength (UCS) is classified as one of the basic mechanical properties of rocks, which is widely used in mining and construction practice. For example, it allows ...
The result indicated that the high-temperature environment had much more effect on the solidified body than the freeze–thaw cycle environment in these four aspects: after …
The compressive strength of solidified bodies decreased with the increment of COPR in both immobilization (without AA)/immobilization and detoxification (having AA) process which could be seen in Fig. 4. The solidified samples having up to 40% of COPR were suitable for constructional purposes because compressive strength was greater than 40 MPa.
Chromite ore processing residue (COPR) was obtained from a chemical plant in Chongqing, China. Ordinary Portland cement (OPC) used in the experiments was from a cement plant in Chongqing, China. The chemical composition of raw materials is listed in Table 1. Alkali activators. Compressive strength of alkali-activated BFS-FA binder
The effect of experiment scheme on the compressive strength of fired pellets is illustrated in Fig. 7. It shows that with the increase of chromite concentrate proportion from 0% (scheme 1) to 14% (scheme 4), the compressive strength of fired nickel‑chromium bearing iron ore pellets increases from 853 N per pellet to 1107 N per pellet.
Chromite ore processing residue (COPR) is a hazardous waste because of leachable chromium, especially Cr(VI). Therefore, ascorbic acid (AA) and blast furnace slag (BFS) have been used to detoxify and solidify ... compressive strength development, and leaching concentration of Cr(VI). The result indicated that the
The research primarily investigates the reduction behavior and compressive strength of chromite pellets in atmospheres based on methane and hydrogen. The findings indicate that the reduction of pellets is positively influenced by temperature, time, and methane proportion. The most favorable reduction conditions were established with a methane ...
Summary The compressive strength of a magnesium chromite refractory in nitrogen was measured by rapidly loading specimens to failure at several temperatures up to 1600OC. 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 ...
In Fig. 7 A, the compressive strengths of pre-reduced pellets produced from chromite ore that were pre-oxidised at different temperatures are compared with the breaking strength of pre-reduced pellets made from un-oxidised chromite ore (base case, indicated with dotted line). It is evident from the results that the pre-reduced pellets made from ...
Chromite ore processing residue (COPR) is a hazardous waste because of leachable chromium, ... The compressive strength of the solidified specimens in the control group reached 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.
The uniaxial compressive strength (UCS) of Sandy Dolomite is an important metric in the application in civil engineering, geotechnical engineering, and underground engineering.
Keeping Cr/Fe ratio at 2.55, the effect of preheating and roasting temperature on the compressive strength of chromite pellets is shown in Fig. 5. As the preheating time was 10 min, raising preheating temperature contributed to improving the strength of preheated pellets (Fig. 5 (a)). When increasing the temperature from 1050 °C to 1100 °C ...
Chromite ore processing residue (COPR) is a typical hazardous waste, which contains Cr(vi) and poses a great threat to the ecological environment and human health. ... According to the optimal conditions of the single-factor experiment, the highest compressive strength of 147.6 MPa was obtained after using the water glass modulus 1.0, liquid ...
Chromite ore processing residue (COPR) is a typical hazardous waste, which contains Cr(vi) and poses a great threat to the ecological environment and human health. ... on compressive strength was ...
The factors studied were as follows: sintering temperature, compressive strength, degree of oxidation (e.g. sesqui oxide content), porosity (e.g . wood dust), coke powder addition and …
The compressive strength was achieved by applying force to the 100x100 mm surface of the block with dimensions of 100x100x80 mm. Substitution of chromite, magnetite aggregate, and quartz-based surface hardener to the upper layer of the parquets did not cause a significant change in the type of decrease or increase in compressive strength.
strength of the ore body dwarsrivier chrome · Steel and alloys top the list for overall strength. Steels, alloys of iron, and other metals are much harder than any one type following are the strongest metals in the world: Carbon Steels have a carbon content up to percent by weight, a yield strength of 260 megapascals (MPa), and a tensile strength of 580 score about 6 on the …
Uniaxial compressive strength ( c), E-modulus and the factor m i in the Hoek-Brown failure criterion for rock masses Average values from tests Tests of rocks world of intact rock samples -wide* Scandinavian rocks tested at SINTEF / NTNU *** Rating of the factor m i ** c E E c Number of tests c E E c Number