Method for leaching nickel and molybdenum from nickel-molybdenum ore

A nickel-molybdenum ore and leaching technology, applied in the field of mining and metallurgy, can solve the problems of low leaching rate, high production cost, inability to extract nickel, etc., and achieve the effects of improving solubility, increasing leaching rate, and increasing solubility

Inactive Publication Date: 2016-04-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the decomposition of nickel-molybdenum ore is mainly carried out by air oxidation roasting-alkaline solution leaching to extract molybdenum, but the oxidation roasting process will produce a large amount of sulfur-containing flue gas, the treatment cost is high, and nickel cannot be extracted
In order to extract nickel and molybdenum in nickel-molybdenum ore at the same time, patent CN1267739A discloses a method for leaching nickel-molybdenum ore with a mixed solution of sulfuric acid and ammonium nitrate. This technology can obtain a higher molybdenum and nickel leaching rate, but the leaching process will produce toxic Nitrogen oxides; patent CN103993169A discloses a nickel-molybdenum ore catalytic oxidation pressurized acid leaching decomposition method, the technology uses oxygen pressure leaching, the leaching rate of nickel and molybdenum is high, but for low-grade nickel-molybdenum ore High production cost; patent CN102560102A discloses a method for leaching nickel and molybdenum from nickel-molybdenum ore by catalytic oxidation, and the leaching system is FeCl 3 +sodium chlorate+acidic system, this method can obtain high nickel leaching rate, but the leaching rate of molybdenum is low, and subsequent alkali leaching is required to obtain high molybdenum leaching rate, and the process flow is long; patent CN104313317A discloses a nickel-molybdenum ore Oxidative acid leaching of nickel and molybdenum, which achieves high nickel and molybdenum leaching rates simultaneously, but also requires pressure leaching
Patent CN103966432A uses oxygen pressure to leach nickel and molybdenum in nickel-molybdenum ore. This method can obtain a high leaching rate of nickel, but the leaching rate of molybdenum is not high due to the limited solubility of molybdenum in acidic solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 1000g of -100 mesh nickel-molybdenum ore containing 4.7% molybdenum and 2.3% nickel, add 7mol / L HCl solution according to the solid-liquid ratio of 1:2g / ml, add 800gNaH 2 PO 4 .2H 2 O, heat up and stir, when the leaching system is heated to 45°C, slowly add 500g of sodium chlorate, react for leaching for 3 hours, and separate liquid and solid. The nickel leaching rate is 97.3%, and the molybdenum leaching rate is 93.5%.

Embodiment 2

[0036] Take 500g of -200 mesh nickel-molybdenum ore containing 1.4% molybdenum and 1.8% nickel, add 3mol / L H 2 SO 4 Add 900g of ammonium phosphate to the solution, heat up and stir, when the leaching system is heated to 100°C, slowly add 180g of potassium chlorate, react for leaching for 5 hours, and separate liquid and solid. The nickel leaching rate is 96.3%, and the molybdenum leaching rate is 91.1%.

Embodiment 3

[0038] Take 1000g of -180 mesh nickel-molybdenum ore containing 3.5% molybdenum and 2.2% nickel, add 1mol / L H 2SO 4 Add 700g of phosphoric acid to the solution, heat up and stir, and when the leaching system is heated to 104°C, slowly add 750g of potassium permanganate, react for leaching for 4 hours, and separate liquid and solid. The nickel leaching rate is 98.7%, and the molybdenum leaching rate is 94.2%.

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Abstract

The invention relates to a method for leaching nickel and molybdenum from nickel-molybdenum ore, in particular to a method for decomposing the nickel-molybdenum ore with molybdophosphate heteropoly acid. According to the invention, P in phosphate anion is used as a central atom to form the molybdophosphate heteropoly acid with molybdenum in an acid solution, so as to increase the solubility in an acid solution, and improve the leaching rate of nickel and molybdenum of the nickel-molybdenum ore during acid leaching. The method has the advantages of being high in nickel and molybdenum leaching rate, short in technological process, simple in equipment, simple and convenient to operate, low in production cost, environment-friendly and the like, and is convenient for large-scale industrial application.

Description

technical field [0001] The invention relates to a method for leaching nickel and molybdenum from nickel-molybdenum ore; in particular, it relates to a method for decomposing nickel-molybdenum ore with phosphorus-molybdenum heteropolyacid; it belongs to the technical field of mining and metallurgy. Background technique [0002] Nickel-molybdenum ore is a kind of polymetallic mineral resource unique to my country, which belongs to sedimentary nickel-molybdenum-vanadium polymetallic ore. Nickel-molybdenum ore generally contains 0.2% to 8.0% molybdenum and 0.2% to 7.0% nickel. The composition and structure of nickel-molybdenum ore are complex, and it is a low-grade complex ore that is difficult to separate and smelt. Nickel in nickel-molybdenum ore exists in the form of siderite, pyrosite and goreite, etc.; molybdenum mainly occurs in an amorphous colloidal sulfide. [0003] At present, the decomposition of nickel-molybdenum ore is mainly carried out by air oxidation roasting-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/06C22B34/34C22B23/00
CPCC22B3/06C22B23/0415C22B34/34Y02P10/20
Inventor 王明玉陈边防王学文周升帆孟钰麒
Owner CENT SOUTH UNIV
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