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Method for synergistic recovery of molybdenum and rhenium from molybdenum concentrate roasting eluent

A technology of eluent and molybdenum concentrate, which is applied in the preparation of molybdenum compounds, chemical instruments and methods, and the preparation of rhenium compounds, etc., which can solve the problems of slow adsorption speed, small saturated adsorption capacity of rhenium, and no consideration of synergistic recovery of molybdenum, etc. problems, to achieve the effect of improving the adsorption speed and adsorption capacity, realizing synergistic utilization, and improving the level of comprehensive utilization

Active Publication Date: 2019-01-11
ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process has the problems of small saturated adsorption capacity and slow adsorption speed of rhenium in a high acidity environment, and the process does not consider the coordinated recovery of molybdenum.

Method used

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  • Method for synergistic recovery of molybdenum and rhenium from molybdenum concentrate roasting eluent
  • Method for synergistic recovery of molybdenum and rhenium from molybdenum concentrate roasting eluent
  • Method for synergistic recovery of molybdenum and rhenium from molybdenum concentrate roasting eluent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: Comparison experiment of molybdenum-rhenium static adsorption before and after waste acid pretreatment

[0047] Add different amounts of CaO to the eluate, react for 100 minutes, filter and wash a small amount (quantitative washing), mix the filtrate and washing water, measure the pH value of the filtrate, analyze the content of molybdenum and rhenium in the solution, and then according to the test results , add a small amount of ammonium perrhenate and ammonium molybdate, and adjust the molybdenum-rhenium content in the solution to be consistent with the molybdenum-rhenium content in the untreated eluate.

[0048] Measure 250ml each of the solution obtained after the pretreatment of waste acid and different lime additions, put them into 500ml conical flasks respectively, put 1ml D314 resin under stirring conditions, take samples after adsorption for different times, and measure the molybdenum content in the solution; Test conditions, put 1ml ZS70 resin to ad...

Embodiment 2

[0061] Embodiment 2: Molybdenum dynamic adsorption test

[0062] Take 10ml of the pretreated D314 resin, put it into the ion exchange column for the test, use a constant flow pump to send the eluent into the ion exchange column at a flow rate of 1BV, take a sample of the effluent at a certain time point, and detect the molybdenum content.

[0063] X-ray diffraction adopts PhilipsX.PertMPD X-ray diffractometer in the Netherlands, CuKα ray, tube voltage 40kV, tube current 30mA, scan rate 0.12° s -1 , the step width is 0.02°.

[0064] Possible chemical reactions during lime neutralization:

[0065] CaO+H 2 SO 4 =CaSO 4 +H 2 O (1)

[0066] CaO+H 2 SO 3 =CaSO 3 +H 2 O (2)

[0067] CaO+H 2 SiF 6 =CaSiF 2 +H 2 O (3)

[0068] CaO+H 2 MoO 4 =CaMoO 4 +H 2 O (4)

[0069] CaO+2HF=CaF 2 +H 2 O (5)

[0070] Put the waste acid before pretreatment and after pretreatment at a temperature of 25°C and a flow rate of 1BV·h -1 Under the conditions, D314 resin was used for ...

Embodiment 3

[0072] Embodiment 3: lime addition

[0073] At 25°C, take 200ml of the eluent into a beaker, add different amounts of CaO under stirring, react for 100 minutes, filter, measure the filtrate and washing water, and conduct multi-element analysis. The relationship between the recovery rate is as figure 1 As shown, the relationship between the amount of CaO added and the removal rate of impurity ions such as sulfur, fluorine, and silicon is as follows: figure 2 shown.

[0074] figure 1 It can be seen that with the addition of CaO at 25g·L -1 ~75g·L -1 When between, the recoveries of molybdenum and rhenium are relatively high, and the addition amount is increased to 100g L -1 , the recovery rate of molybdenum-rhenium is greatly reduced. The amount of CaO added is 75g·L -1 When 15g CaO is added to 200ml waste acid, the recovery rate of molybdenum is 99.56%, and the recovery rate of rhenium is 98.91%; the amount of CaO added is 100g L -1 , the molybdenum yield was 87.40%, an...

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Abstract

The invention discloses a method for synergistic recovery of molybdenum and rhenium from a molybdenum concentrate roasting eluent, which belongs to the technical field of comprehensive recycling of metal rhenium and molybdenum. The method comprises the following steps: mixing the molybdenum smelting waste acid and a pretreatment agent, stirring a mixture, and then performing solid-liquid separation; introducing a filtrate to an exchange column containing weakly basic anion exchange resin A to adsorb rhenium, and introducing the adsorbed liquid in an exchange column filled with the weakly basicanion exchange resin B to adsorb molybdenum; performing desorption with the adsorbed saturated A column, collecting a desorption solution, and performing evaporation crystallization to obtain an ammonium perrhenate product; performing desorption with the adsorbed saturated B column, collecting the desorption solution, and performing evaporation crystallization to obtain an ammonium molybdate product. In a pretreatment step in the process, no rhenium loss is generated, the molybdenum loss rate is less than 8%, after treatment, the liquid is introduced into ion exchange, compared with the direct adsorption process, the method can increase the adsorption capacity of the resin A to the rhenium, and by changing the acidity of the solution and the impurity ion content, the high-efficiency adsorption of the resin B to the molybdenum is achieved.

Description

technical field [0001] The invention relates to a method for synergistically recovering rhenium and molybdenum from molybdenum concentrate roasting eluent, and belongs to the technical field of comprehensive recovery and utilization of metal rhenium and molybdenum. Background technique [0002] The flue gas generated during the roasting of molybdenum concentrate needs to be sprayed before it enters the acid making process to remove fine particles in the flue gas and remove fluorine in the flue gas. During the spraying process, part of the sublimated molybdenum and rhenium and fine molybdenum and rhenium oxides that have not been captured by the dust collection system enter into the eluent. 5g / L, the content of rhenium is 10-100mg / L, which has a good comprehensive recovery value. [0003] The synergistic utilization of molybdenum and rhenium is difficult due to the complex composition and high acidity of the eluent. On the one hand, because the molybdenum and rhenium in the...

Claims

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Application Information

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IPC IPC(8): C01G39/00C01G47/00
CPCC01G39/003C01G47/003
Inventor 刘红召张博王威曹耀华柳林王洪亮
Owner ZHENGZHOU MINERALS COMPOSITIVE UTILIZATION RES INST CHINESE GEOLOGICAL ACAD
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