Effective and economical treatment of low-grade nickel laterite by a duplex process of direct reduction-magnetic separation & rotary kiln-electric furnace and its industrial application

Carbon monoxide is the major hazardous component in flue gas exhausting from the iron ore sintering. This study aims to reduce the CO emission by changing the sinter parameters by sintering pot tests; specifically, the sinter quality, CO concentration, and total emission in sintering flue gas were analyzed in detail. The sinter strength properties, including the shatter index and the tumble index, are analyzed by the sintering pot test and the sintering flue gas discussion. The results show that the CO emission can be suppressed by modifying the sinter parameters, such as carbon content, coke breeze and coal breeze ratio, water addition, and sintering negative pressure. The good sinter parameters with the lower CO emission are 2.8% carbon content and 7.5% water in the sintering mixture. A higher coke breeze to coal breeze ratio, or only coke breeze fuel in the sinter mixture, is beneficial for the lower CO emission with a negative fan pressure of −12 kPa.

/pdf/influence-of-sinter-parameters-on-co-emission-in-iron-ore-259eoxdz.pdf

Influence of Sinter Parameters on CO Emission in Iron Ore Sintering Process

Review on comprehensive utilization of nickel laterite ore

In this study, copper slag and low-grade nickel laterite were synergistically utilized via an innovative sintering process with multi-force fields. Their sintering performance and the reduction and softening dripping characteristics of Fe–Ni–Cu product sinter were determined. The strengthening mechanism of the innovative sintering technology was revealed. The obtained Fe–Ni–Cu alloy and smelting slag from the melting dripping process were characterized. Carbon emissions reduction and other valuable elements treatment were also discussed. Due to the formation of the denser sinter microstructure and the reduction of high smelting components, sintering performances in the innovative sintering process are substantially improved. Compared with the base case, tumble index and productivity are improved by 24.87% and 19.59%, respectively. Solid fuel consumption is reduced by 27.14%. The reduction and softening dripping characteristics of Fe–Ni–Cu product sinter are excellent as well. The obtained Fe–Ni–Cu alloy with high purity can be used as the high-quality burden for copper-bearing stainless steel and high-strength alloy steel and its quality can be further improved by optimizing the smelting process parameters in the near future. In addition, the obvious carbon emissions reduction in sintering-blast furnace production can be achieved and other valuable elements such as S, Zn and Pb can be conveniently recycled in form of sulphuric acid and Pb–Zn dust, respectively. 

Efficient utilization of copper slag in an innovative sintering process for Fe-Ni-Cu alloy preparation and valuable elements recovery

Abstract In consideration of the abundant moisture of limonitic nickel laterite mined, it is essential to determine whether the self-possessed moisture of limonitic nickel laterite after pre-dried is appropriate for sintering. Thus, based on the characterization of limonitic nickel laterite, the influence of its self-possessed moisture on sintering performance was expounded by sinter pot tests and the relevant mechanism was revealed by the systematical analyses of the granulation properties of sinter mixture, thermodynamic conditions during sintering and mineralogy of product sinter. The results indicate that the self-possessed moisture of limonitic nickel laterite indeed has significant influence on its sintering performance. At the optimum self-possessed moisture of 21 mass%, sinter indices are relatively better with tumble index, productivity and solid fuel rate of 48.87%, 1.04 t m −2 h −1 and 136.52 kg t −1 , respectively, due to the superior granulation properties of sinter mixture and thermodynamic conditions during sintering, relatively large amount of silico-ferrite of calcium and alumina and tighter sinter microstructure. However, sintering performance of limonitic nickel laterite is still much poorer than that of ordinary iron ores. It is feasible to strengthen limonitic nickel laterite sintering by inhibiting the over-fast sintering speed and improving the thermodynamic conditions during sintering. 

/pdf/significant-influence-of-self-possessed-moisture-of-2zyi9buz.pdf

Significant influence of self-possessed moisture of limonitic nickel laterite on sintering performance and its action mechanism

Co-benefits of CO2 emission reduction and sintering performance improvement of limonitic laterite via hot exhaust-gas recirculation sintering

The invention discloses a processing method of applying waste desulfurizing agents to sintering. The processing method includes the following steps that the waste desulfurizing agents are crushed intoparticles with the granularity smaller than 8 mm accounting for 100%, and with the granularity smaller than 1 mm accounting for 10%; evenly mixed powder is obtained by evenly mixing the crushed wastedesulfurizing agents and iron ore powder; evenly mixed ore powder is obtained by burying the evenly mixed powder in an iron ore powder pile; evenly mixed sintering powder is obtained by mixing the evenly mixed ore powder, iron ore powder, solid fuel, fluxing agents and return fines; water is added to the evenly mixed sintering powder to be subject to mixing and pelletizing to form evenly mixed sintering powder; sintered ore and sintering flue gas are obtained by sintering the pelletized materials; and the sintering flue gas is exhausted into the atmosphere after being subjected to desulfurization and denitrification. According to the processing method, the waste desulfurizing agents are crushed and then matched with the iron ore powder for sintering, the sintered ore is obtained for blastfurnace ironmaking, and iron, calcium and magnesium are recycled. Activated carbon absorbing sulfur dioxide can be used for desorbing the sulfur dioxide and making acid so as to recover sulfur. Thus,harmless disposal of the waste desulfurizing agents is carried out, and resource utilization of the waste desulfurizing agents is achieved.

Processing method of applying waste desulfurizing agents to sintering

The invention provides high quality sintered ores for a COREX smelting reduction process for ironmaking and a preparation method thereof. The preparation method comprises the following steps: dividing30-50% of iron ore concentrate and 4-7% of flux 1 as well as 1.0-1.5% f a solid fuel from the total amount of iron ore concentrate for proportioning, and uniformly mixing the three to prepare flux carbon-burdened green pellets; proportioning the divided residual iron ore concentrate and iron-containing miscellaneous materials, return ores, flux 2 and the solid fuel and uniformly mixing the mixture to obtain a mixed material; and mixing, granulating, distributing, igniting, sintering, cooling, crushing and screening the obtained green pellets and the mixed material to obtain the sintered oresand the return ores. The sintered ores prepared by the method can meet the demand that the low-temperature reduction degradation value of the sintered ores in a COREX vertical furnace: RDI+6.3 is greater than or equal to 50% when the alkalinity is 1.8. The furnace mass ratio of the sintered ores can be greater than 50%, so that the cost of an ironmaking furnace burden can be lowered effectively.

High quality sintered ores for COREX smelting reduction process for ironmaking and preparation method thereof

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Co-benefits of CO2 emission reduction and sintering performance improvement of limonitic laterite via hot exhaust-gas recirculation sintering

Processing method of applying waste desulfurizing agents to sintering

High quality sintered ores for COREX smelting reduction process for ironmaking and preparation method thereof