Cleaning and smelting process for low-grade complex nickel-molybdenum ore

A nickel-molybdenum ore, low-grade technology, applied in the clean smelting process of low-grade complex nickel-molybdenum ore, can solve the problems of long process, low concentration, poor environment, etc., achieve efficient separation and recovery, realize resource utilization, and reduce pollution.

Active Publication Date: 2018-08-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The chemical composition of nickel-molybdenum ore A is (%): Mo 5.81%, Ni 6.12%, Zn 3.19%, Fe 17.22%, As0.8%, Al 3.11%, Si 16.63%, SiO 2 22.7%, P 1.18%, S 27.9%.

[0033] First, mix 10g of nickel-molybdenum ore A with a particle size of -150 mesh, chlorinating agent, 2g of pulverized coal 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 As, Mo, and Zn in 10g nickel-molybdenum ore A into AsCl 3 、MoCl 5 , ZnCl 2 2.5 times the required theoretical amount. Put the wet balls directly into the volatilization kiln which has been raised to 380°C for chlorination and volatilization, and keep it warm for 60 minutes. At this time, under the action of the negative pressure induced draft fan at the flue mouth of the volatilization kiln,...

Embodiment 2

[0035] The chemical composition of nickel-molybdenum ore B is (%): Mo 3.07%, Ni 6.88%, Zn 1.49%, Fe 18.6%, As0.39%, Si 13.55%, SiO 2 23.1%, P 1.53%, S 21.5%.

[0036] First, mix 100g of nickel-molybdenum ore B with a particle size of -250 mesh, chlorinating agent, 30g of pulverized coal 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 As, Zn, and Mo in 100g nickel-molybdenum ore B into AsCl 3 、MoCl 5 , ZnCl 2 4 times the required theoretical amount. Put the wet pellets directly into the volatilization kiln which has been raised to 350°C for chlorination and volatilization, and keep it warm for 80 minutes. At this time, under the action of the negative pressure induced draft fan at the flue mouth of the volatilization kiln, the p...

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Abstract

A cleaning and smelting process for low-grade complex nickel-molybdenum ore comprises the steps that the nickel-molybdenum ore, a chlorinating agent and water are evenly mixed in a certain proportionand granulated, granulated pellets are directly put into a volatilization furnace without drying, and chlorination and volatilization smelting is carried out under a certain heat preservation and heating mechanism and the reducing atmosphere; and arsenic chloride, molybdenum chloride, zinc chloride and other products are recovered from flue gas generated by volatilization in a flue gas collectiondevice. By the adoption of the cleaning and smelting process, all kinds of low-grade complex nickel-molybdenum ore can be treated, molybdenum, zinc, arsenic and other valuable components can be separated in one step, and the volatile slag obtained by volatilization can be sold directly if the requirement of low nickel matte is met. Compared with an existing nickel-molybdenum ore treatment method,the method has the beneficial effects of the low energy consumption, high efficiency, cleanness and environmental protection.

Description

technical field [0001] The invention relates to a clean smelting process 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% molybden...

Claims

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Application Information

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IPC IPC(8): C22B23/02C22B34/34C22B19/00
CPCC22B19/00C22B23/02C22B34/34
Inventor 杨建广闫万鹏朱和平李陵晨刘山
Owner CENT SOUTH UNIV
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