Method for comprehensive recovery of molybdenum and rhenium from high molybdenum-rhenium concentrate

Abstract

The invention discloses a method for comprehensive recovery of molybdenum and rhenium from high molybdenum-rhenium concentrate. The method comprises the following steps: mixing, pelletizing and roasting molybdenum-rhenium concentrate and lime to obtain a calcined material; leaching molybdenum and rhenium from the calcined material by using a sulfuric acid solution; neutralizing lixivium by adopting the calcined material to obtain a neutralization solution; purifying the neutralization solution, removing phosphorus, arsenic and silicon, and then acidifying until the pH of the solution is 2.0-3.0; synchronously extracting molybdenum and rhenium from the purified neutralization solution by adopting the solvent, and carrying out acidic precipitation on strip liquor to obtain an ammonium molybdate product; synchronously extracting molybdenum and rhenium from precipitated molybdenum mother liquor to obtain ammonium rhenate containing molybdenum; removing molybdenum from the ammonium rhenate containing molybdenum by adopting calcium chloride to obtain a purified ammonium rhenate solution; concentrating the purified ammonium rhenate solution and then adding potassium chloride to carry out rhenium precipitation, thereby obtaining a potassium perrhenate product. The method has the advantages of short process, low cost, simplicity in operation and high recovery rate, and ammonium molybdate and potassium perrhenate product can be obtained.

Description

technical field [0001] The invention relates to a method for comprehensively recovering molybdenum and rhenium from high-rhenium molybdenum concentrate. Background technique [0002] The molybdenum concentrate produced by the concentrator of Shaanxi Lianshi Mining Co., Ltd. contains Mo-48% and Re-240g / t. The raw material adopts the existing multi-hearth furnace roasting process to prepare molybdenum oxide, which has a low rhenium recovery rate and produces a large amount of low-concentration SO 2、 Serious environmental pollution and other outstanding problems; acidic or alkaline oxygen pressure leaching has problems such as complex equipment and inconvenient operation. Lime Roasting—Although sulfuric acid leaching method has been studied to treat molybdenum-containing molybdenum concentrates, currently sulfuric acid is mostly used to leach molybdenum-rhenium in lime roasting materials in stages to obtain neutral rhenium-containing leachate and high-acidity molybdenum-conta...

AI Technical Summary

Problems solved by technology

The raw material adopts the existing multi-hearth furnace roasting process to prepare molybdenum oxide, which has a low rhenium recovery rate and produces a large amount of low-concentration SO 2、 Serious environmental pollution and other outstanding problems; acidic or alkaline oxygen pressure leaching has problems such as complex equipment and inconvenient operation

Lime Roasting—Although sulfuric acid leaching method has been studied to treat molybdenum-containing molybdenum concentrates, currently sulfuric acid is mostly used to leach molybdenum-rhenium in lime roasting materials in stages to obtain neutral rhenium-containing leachate and high-acidity molybdenum-containing leachate. D201 resin is used to absorb and recover rhenium in the leaching solution. The concentration of rhenium in the rhenium-containing leaching solution is low, and the amount of solution to be processed for recovery of rhenium is large, and the treatment cost is high; the leaching solution containing molybdenum is neutralized by alkali, and molybdenum is extracted and recovered by amine extraction agent to prepare ammonium molybdate

The patent applied by Shaanxi Lianshi Mining Co., Ltd. and Hunan Nonferrous Metals Research Institute in 2011 adopts the lime roasting-sulfuric acid two-stage leaching process. Although the process avoids SO 2 Flue gas pollution, but when there is neutral leaching, the leaching rate of rhenium is low, the concentration of rhenium in the leaching solution is low, and subsequent recovery of rhenium is difficult; the slag after leaching rhenium is then leached molybdenum with sulfuric acid solution, and the molybdenum leaching solution uses alkali to neutralize the residual acid, which increases Consumption of acid and alkali reagents in the process, increased production costs, and increased loss of molybdenum and rhenium

The two-stage leaching process is complicated, the reagent consumption is large, the equipment investment is large, and the cost is high. The process needs to be further improved

Rhenium and molybdenum are leached separately in the two stages of the original process. The leaching process is complicated. Rhenium and molybdenum are dispersed during the leaching process, which is not conducive to subsequent recovery; D201 resin adsorption, molybdenum extraction with amine extractant, it is difficult to recover rhenium in the liquid after molybdenum extraction, and the product quality is difficult to guarantee