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Recovery method of molybdenum concentrates

A recovery method and technology for molybdenum concentrate, applied in chemical instruments and methods, molybdenum compounds, rhenium compounds, etc., can solve the problems of large alkali consumption, large oxygen consumption, low sulfuric acid concentration in leachate, etc., to improve recovery rate, reduce Effects of Environmental Pollution

Inactive Publication Date: 2011-01-26
ZIJIN MINING GROUP
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The nitric acid high-temperature oxygen pressure decomposition process for molybdenite treatment is also called the Cyprus process. This process has the advantages of high decomposition rate, fast reaction speed, good product quality, no SO2 pollution, and can process non-standard molybdenum concentrates with high impurities; The material requirements for leaching equipment are high, the oxygen consumption is large, the concentration of sulfuric acid in the leaching solution is too low, it is difficult to recycle, and safety accidents are prone to occur during the production process.
Alkaline hot pressing solves the environmental pollution caused by molybdenum concentrate roasting, the temperature and pressure are lower than the high pressure oxygen leaching in acidic medium, the leaching rate of molybdenum is high, up to 99%; the material of the equipment is easy to solve; but the The alkali consumption is too large during the leaching process, the reaction time is long, and the processing capacity is small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This embodiment provides a method for comprehensive utilization of molybdenum, rhenium, copper, and sulfur in a combined high-pressure oxidation-flotation process for the problems existing in the prior art.

[0019] The method comprises: carrying out high-temperature oxygen pressure leaching autothermal reaction of molybdenum concentrate under alkaline conditions, controlling the reaction speed by adjusting the oxygen partial pressure without external heating. Add 90-130 times the theoretical amount of sodium hydroxide, the reaction temperature is 140-170°C, and the high-temperature oxygen pressure leaching time is 1-3 hours. The self-heating oxidized slag is returned to the flotation system, and the molybdenum concentrate is obtained by one-time roughing, one-time sweeping and four-time beneficiation, and the metal copper in the flotation tailings is recovered by acid leaching. Molybdenum concentrate and oxide slag flotation concentrate are blended according to the rat...

Embodiment 2

[0023] Molybdenum concentrate contains molybdenum 42.70%, Cu 3.52%, Re 0.0015%, S 34.15%, SiO 2 4.41%.

[0024] Take 120g of molybdenum concentrate and 140g of sodium hydroxide for autothermal leaching for 1.5h under the conditions of liquid-solid ratio 7 and temperature 140℃, the total pressure is controlled at 1.6MPa, and the solid-liquid separation is achieved by filtration; The fine open circuit flotation process test obtained a molybdenum concentrate with a molybdenum content of 34.22% and a yield of 14.30%. The obtained oxide slag flotation molybdenum concentrate and the original molybdenum concentrate were blended in a ratio of 1:1 for autothermal leaching; the flotation tailings molybdenum The grade is reduced to 0.36%, and acid leaching is carried out at a sulfuric acid concentration of 80g / L to prepare copper sulfate; ammonium molybdate and ammonium perrhenate products are produced from the leaching solution, and sodium sulfate is prepared by evaporation and crystall...

Embodiment 3

[0026] Molybdenite concentrate contains molybdenum 43.94%, Cu 1.07%, Re 0.0016%, S 31.75%, SiO 2 7.53%.

[0027] Take 120g of molybdenum concentrate and 120g of sodium hydroxide to conduct autothermal leaching for 1.5h under the condition of liquid-solid ratio 7 and temperature 160℃, the total pressure is controlled at 1.6MPa, and the solid-liquid separation is achieved by filtration; The refined open-circuit flotation process test obtained a molybdenum concentrate with a molybdenum content of 36.30% and a yield of 15.30%. The obtained oxide slag flotation molybdenum concentrate and the original molybdenum concentrate were mixed in a ratio of 1:1 for autothermal leaching; the flotation tailings molybdenum The grade is reduced to 0.40%, acid leaching is carried out at a sulfuric acid concentration of 50g / L to prepare copper sulfate; ammonium molybdate and ammonium perrhenate products are produced from the leaching solution, and sodium sulfate is prepared by evaporation and cry...

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Abstract

The invention discloses a recovery method of molybdenum concentrates. The method comprises the following steps of: carrying out a hot pressing natural reaction of materials to be processed under an alkaline condition; enriching molybdenite through flotation from natural oxide slag after natural leaching, returning for hot pressing oxidation and floating tailing slag to recover copper; producing high-purity ammonium molybdate and ammonium perrhenate from leached liquid after the natural leaching through the process of extraction, purification, acid precipitation, ammonia dissolution, concentration and crystallization; and removing sodium sulfate by evaporating or freezing and crystallizing raffinate to produce a sodium sulfate product. According to the invention, the recovery rate of the molybdenum concentrates is improved.

Description

technical field [0001] The invention relates to a method for recovering molybdenum concentrate. Background technique [0002] At present, the industrial sources of molybdenum mainly include primary molybdenum ore, by-products and co-products of copper ore, and molybdenum-containing waste catalysts. Most of the raw materials for molybdenum metallurgy in my country are primary molybdenum, namely molybdenite (MoS2). The classic process of molybdenite metallurgy is to prepare ammonium paramolybdate through oxidation roasting, ammonia leaching, purification, neutralization or evaporation crystallization of molybdenum concentrate. With the increasingly stringent environmental protection requirements and the trend of poor, miscellaneous and refined molybdenum-containing ores, the disadvantages of this process are becoming more and more prominent. There are three main aspects: (1) low-concentration SO2 flue gas pollutes the environment; (2) metal synthesis The recovery rate is low....

Claims

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Application Information

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IPC IPC(8): C22B3/12C22B3/26C22B15/00C01G39/00C01G47/00C01D5/00
CPCY02P10/20
Inventor 阮仁满邹来昌伍赠玲石仑雷谭希发衷水平
Owner ZIJIN MINING GROUP
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