Sodium bentonite and kaolin clays: Comparative study on their FT-IR, XRF, and XRD

https://research.chalmers.se/publication/517682/file/517682_Fulltext.pdf

Vanadium sustainability in the context of innovative recycling and sourcing development.

The invention discloses a treatment method of laterite nickel ore The method comprises the steps that the laterite nickel ore, reduction agents and fluxing agents are mixed so as to obtain a raw material mixture; granulation is conducted on the raw material mixture so as to obtain mixed materials; reduction roasting treatment is conducted on the mixed materials so as to obtain a prereduction product; melt separation treatment is conducted on the prereduction product, and slagging agents and ferric oxide are added in the melt separation treatment process, so that ferro-nickel alloy is obtained Due to the fact that Fe2O3 is added in the melt separation process, the deep reduction rate of FeO is significantly decreased, the fluidity of smelting slags is high, the fusing temperature of furnace charge is decreased, and the recovery rate of the nickel element is significantly increased

Treatment method of laterite-nickel ore

The invention discloses a method for preparing calcium carbide. The method comprises the steps that a carbon-contained raw material, a calcium-contained raw material and an additive are subjected to fine grinding so that carbon-contained raw material particles, calcium-contained raw material particles and additive particles can be obtained, wherein the additive contains lithium carbonate and calcium fluoride, the calcium-contained raw material is quick lime, and the carbon-contained raw material is coal or semi coke; the carbon-contained raw material particles, the calcium-contained raw material particles and the additive particles are mixed so that a mixed material can be obtained; the mixed material is smelted so that the calcium carbide can be obtained. According to the method, on one hand, due to the fact that the additive containing the lithium carbonate and the calcium fluoride is added in the smelting process, the purpose of producing the calcium carbide under the low-temperature condition in a smelting mode is achieved; on the other hand, the raw materials are subjected to fine grinding, the specific area of the raw materials is improved, the contact area of the two kinds of raw materials is increased, the mass transferring efficiency and the heat transferring efficiency of the raw materials are improved, the reaction rate is increased, and the reaction temperature and the process energy consumption of calcium carbide smelting are reduced.

Method for preparing calcium carbide

Effect of ash and dolomite on the migration of sulfur from coal pyrolysis volatiles

The invention discloses a semi-coke powder molding method. The semi-coke powder molding method comprises the following steps: (1) breaking and screening semi-coke powder, lime powder, steam coal and sodium humate respectively; (2) mixing the screened semi-coke powder, lime powder, steam coal and sodium humate to obtain a mixed material; (3) molding the mixed material to obtain molded pellets, and drying the pellets to obtain a briquette. The semi-coke powder and the steam coal are blended, and then the lime powder and the sodium humate are added for preparing a briquette product by molding, the strength of the briquette reaches 310-405 N/pellet and the heat value reaches 7300-7600 kcal/kg. The method is simple in process, makes full use of the semi-coke powder resources, reduces the production cost of the briquette and guarantees the strength of the briquette.

Semi-coke powder molding method

The invention discloses a preparation method of formed coke. The preparation method includes the steps of firstly, mixing brown coal semi-coke powder with brown coal to obtain a mixed material; secondly, evenly mixing the mixed material with a composite adhesive; thirdly, performing extrusion forming on the evenly-mixed materials obtained in the third step under the pressure of 15-20MPa to obtain the formed coke. The preparation method has the advantages that cold pressing forming is used, brown coal semi-coke which can be extremely easily pulverized is used as the raw material, effective utilization of dust-containing oily sludge is achieved at the same time, and the formed coke excellent in performance is prepared; the method which uses local raw materials is low in equipment investment, low in production cost, energy-saving, environmentally friendly and easy to achieve batch production.

Preparation method formed coke

The invention provides a forming method of lignite pellets. The forming method includes the following steps of adding caustic soda flakes, humic acid lignite and water to lignite powder to be evenly stirred to form a mixture, making the mixture stand, cooling the mixture to the room temperature, and putting the cooled mixture into a forming device to be subjected to cold press molding to prepare the lignite pellets. The mass ratio of caustic soda flakes to lignite powder is (3-10):100, the mass ratio of humic acid lignite to lignite powder is (8-20):100, and the mass ratio of water to lignite powder is (10-25):100. The forming method is easy and convenient to operate and low in cost, the prepared lignite pellets are good in strength, convenient to store, transport and use and easy to apply industrially.

Forming method of lignite pellets

The invention relates to the field of chemical metallurgy and in particular to flue gas waste heat reusing type system and method for directly reducing laterite nickel ores to produce granular iron. The system comprises a raw material processing device, a preheating and reducing device, a dust collection device, a rough shattering and gravity separation device and an ore grinding and magnetic separation device, wherein the raw material processing device is composed of a crushing device, a screening device and a mixing device which are sequentially connected together and is provided with a laterite nickel ore inlet, a reduction coal inlet, an additive inlet and a water-containing mixture outlet; the preheating and reducing device is composed of a feeding region, a drying pipe preheating region, a side wall burner reduction region and a discharge region which are arranged adjacent with one another; the feeding region is provided with a water-containing mixture inlet and a semi coke inlet; the dust collection device is composed of a flue gas inlet, a dedusting flue gas outlet and a dust outlet; the rough shattering and gravity separation device is composed of a reduction material inlet, a nickel-iron granular iron outlet and a primary tailing outlet; and the ore grinding and magnetic separation device is composed of a primary tailing inlet, a nickel-iron powder outlet and a secondary tailing outlet. The system has the advantages of short processing flow, low cost, high operation rate, low energy consumption and the like.

Flue gas waste heat reusing type system and method for directly reducing laterite nickel ores to produce granular iron

The invention belongs to the field of metallurgy and particularly relates to a treatment system and method for wet blocks of lateritic nickel ore The system comprises a raw material treatment device, a preheating and reducing device and a separating device The raw material treatment device comprises a crushing device, a screening device and a mixing device which are sequentially connected The preheating and reducing device comprises a feeding region, a drying pipe preheating region, a side wall nozzle reducing region and a discharging region which are adjacent to each other in sequence The separating device comprises a reducing material inlet, a ferronickel product outlet and a tailing outlet According to the treatment system and method, wet material blocks directly enter the procedures of a rotary hearth furnace for treatment of the lateritic nickel ore, the technological process is shortened, and the equipment investment, the production cost and the production energy consumption are lowered; and a regenerative combustion technology can be adopted for the rotary hearth furnace, inferior or low-quality fuel can be used, the fuel cost is lowered, and the treatment system and method can be popularized in China and in the regions having a shortage of natural gas and high-quality fuel

Treatment system and method for wet blocks of lateritic nickel ore

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