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A nickel-molybdenum ore, low-grade technology, applied in the field of cleaning and pretreatment of low-grade complex nickel-molybdenum ore, can solve the problems of long process, low concentration, low efficiency, etc., and achieve the effect of reducing and avoiding pollution
Active Publication Date: 2018-09-11
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
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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%, As 0.79%, Al 3.37%, Si 12.68%, SiO 2 21.4%, P 1.402%, S 23.75%.
[0030] First, 10 g of nickel-molybdenum ore A with a particle size of -150 mesh was mixed with a chlorinating agent and 3 g of water to make pellets with an average particle size of 1.5 mm. The chlorinating agent is a mixture of ammonium chloride and calcium chloride, wherein ammonium chloride accounts for 35 wt.% and calcium chloride accounts for 65 wt.%. The amount of chlorinating agent added is to convert all Ni, Zn, As, Mo in 10 g of nickel-molybdenum ore A into NiCl 2 , ZnCl 2 , AsCl 3 , MoCl 5 2.5 times the theoretical amount required. Put the wet pellets directly into the volatilization kiln to start chlorination volatilization. First, the furnace temperature was raised to 480°C within 30min, and the temperature was kept at 480°C for 60min. At this time, under the action of the negative pres...
Embodiment 2
[0032] The chemical composition of nickel molybdenum ore B is (%): Mo 6.03%, Ni 1.52%, Zn 1.83%, Fe 18.15%, As 0.53%, Si 13.18%, SiO 2 21.6%, P 1.33%, S 22.76%.
[0033] First, 100 g of nickel-molybdenum ore B with a particle size of -250 mesh was mixed with a chlorinating agent and 20 g of water to make pellets with an average particle size of 2.0 mm. The chlorinating agent is a mixture of ammonium chloride and calcium hypochlorite, wherein ammonium chloride accounts for 60 wt.% and calcium chloride accounts for 40 wt.%. The amount of chlorinating agent added is to convert all Ni, Zn, As, Mo in 100 g of nickel-molybdenum ore B into NiCl 2 , ZnCl 2 , AsCl 3 , MoCl 5 4 times the theoretical amount required. Put the wet pellets directly into the volatilization kiln to start chlorination volatilization. First, the furnace temperature was raised to 450°C within 20min, and the temperature was kept at 450°C for 100min. At this time, under the action of the negative pressure ...
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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 pretreatment method for low-grade complex nickel-molybdenum ore, which belongs to the field of non-ferrous metal metallurgy. Background technique [0002] Nickel-molybdenum ore is a sedimentary black shale deposit and is a unique polymetallic mineral resource in my country. It is mainly distributed in Zunyi in Guizhou, Zhangjiajie in Hunan, Duchang in Jiangxi, Yunnan and Fuyang in Zhejiang. The composition of nickel-molybdenum ore is relatively complex. In addition to nickel and molybdenum, it also contains a variety of other metal and non-metal 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 different places often have certain differences, but usually contain 0.2% to 8.0% molybdenum and 0.2% to 7...
Claims
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