A cleaning pretreatment method for low-grade complex nickel-molybdenum ore
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A nickel-molybdenum ore, low-grade technology, applied in the field of clean pretreatment of low-grade complex nickel-molybdenum ore, can solve the problems of long process, low concentration, difficult to meet the requirements of acid production, etc., and achieve the effect of reducing and avoiding pollution
Active Publication Date: 2019-07-26
CENT SOUTH UNIV
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Problems solved by technology
The main problem of this pretreatment process based on oxidation roasting is: the SO in the flue gas produced by high temperature oxidation roasting of nickel-molybdenum 2 The concentration is usually low, it is difficult to meet the requirements of acid production, and if it is mixed with pyrite and roasted together to meet the requirements of flue gas acid production, the treatment cost is not cost-effective
The biggest problem is that the pretreatment methods such as roasting, oxidative acid leaching, and alkali leaching inevitably bring disadvantages such as poor environment, long process, and low efficiency.
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Embodiment 1
[0029] The chemical composition of nickel-molybdenum ore A is (%): Mo 5.81%, Ni 3.76%, Zn 3.19%, Fe 16.87%, As0.79%, Al 3.37%, Si 12.68%, SiO 2 21.4%, P 1.402%, S 23.75%.
[0030] First, mix 10g of nickel-molybdenum ore A with a particle size of -150 mesh, chlorinating agent and 3g of water to make balls with an average particle size of 1.5mm. The chlorination agent is a mixture of ammonium chloride and calcium chloride, wherein ammonium chloride accounts for 35wt.%, and calcium chloride accounts for 65wt.%. The amount of chlorinating agent added is to convert all Ni, Zn, As, and Mo in 10g nickel-molybdenum ore A into NiCl 2 , ZnCl 2 , AsCl 3 、MoCl 5 2.5 times the required theoretical amount. Put the wet pellets directly into the volatilization kiln to start chlorination volatilization. First raise the furnace temperature to 480°C within 30 minutes, and keep the temperature at 480°C for 60 minutes. At this time, under the action of the negative pressure induced draft f...
Embodiment 2
[0032] The chemical composition of nickel-molybdenum ore B is (%): Mo 6.03%, Ni 1.52%, Zn 1.83%, Fe 18.15%, As0.53%, Si 13.18%, SiO 2 21.6%, P 1.33%, S 22.76%.
[0033] First, mix 100g of nickel-molybdenum ore B with a particle size of -250 mesh, chlorinating agent and 20g of water to make balls with an average particle size of 2.0mm. The chlorination agent is a mixture of ammonium chloride and calcium hypochlorite, wherein ammonium chloride accounts for 60wt.%, and calcium chloride accounts for 40wt.%. The amount of chlorinating agent added is to convert all Ni, Zn, As, and Mo in 100g nickel-molybdenum ore B into NiCl 2 , ZnCl 2 , AsCl 3 、MoCl 5 4 times the required theoretical amount. Put the wet pellets directly into the volatilization kiln to start chlorination volatilization. First raise the furnace temperature to 450°C within 20 minutes, and keep the temperature at 450°C for 100 minutes. At this time, under the action of the negative pressure induced draft fan at...
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Abstract
The invention provides a low-grade complex nickel-molybdenum ore cleaning pretreatment method. Nickel-molybdenum ores, a chlorinating agent and water are uniformly mixed at the specific proportions and then subjected to pelleting, material balls after being pelleted are directly placed in a volatilization furnace without being dried, and chlorination volatilization and smelting are conducted undera specific warming mechanism. Products such as molybdenum chloride, zinc chloride, arsenic chloride, nickel chloride, ammonium sulfide and ammonium sulfate in the smoke generated by volatilization are recycled respectively in a smoke collection device. The method can treat various kinds of low-grade and complex nickel-molybdenum ores, molybdenum, zinc, nickel and other valuable components in thenickel-molybdenum ores can be separated in a one-step mode, sulphur can be recycled in the forms of ammonium sulfide, ammonium sulfate and the like, and emission of low-concentration SO2 is avoided. Meanwhile, harmful components such as concomitant arsenic in the nickel-molybdenum ores can be deeply volatilized and removed, and the volatile residue obtained through volatilization is harmless to the environment. Compared with an existing nickel-molybdenum ore treatment method, the method has the advantages that the energy consumption is low, the efficiency is high, and the clean and environment-friendly effects are achieved.
Description
technical field [0001] The invention relates to a cleaning and pretreatment method of low-grade complex nickel-molybdenum ore, which belongs to the field of nonferrous metal metallurgy. Background technique [0002] Nickel-molybdenum ore is a sedimentary black shale deposit, which is a unique polymetallic mineral resource in my country. It is mainly distributed in Zunyi, Guizhou, Zhangjiajie, Hunan, Duchang, Jiangxi, Yunnan, Fuyang, Zhejiang and other South China regions. The composition of nickel-molybdenum ore is relatively complex. In addition to nickel and molybdenum, it also contains a variety of other metals and non-metallic elements, such as V, Cu, Se, Zn, Fe, Ca, Mg, Al and precious metals, rare earths, C organics, etc. Due to different factors such as geological structure and biochemical environment, the mineral composition and element content of nickel-molybdenum ore enrichment layers in various places often have certain differences, but usually contain 0.2% to 8.0...
Claims
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