Method for selective dephosphorization in molybdenum and phosphorus mixed solution

Abstract

The invention relates to the scientific field of rare metal separation, and provides a method for selective dephosphorization in a molybdenum and phosphorus mixed solution. The method comprises the steps of pH value adjustment, selective dephosphorization agent preparation, solid-liquid separation and the like. The method comprises the following steps that firstly, liquid caustic soda is added, the pH value of the molybdenum and phosphorus mixed solution is controlled to be in a proper range, then calculating is conducted according to the concentration of phosphorus in the molybdenum and phosphorus mixed solution, a corresponding amount of selective dephosphorizing agent sodium carbonate and calcium oxide are added, the temperature and the stirring speed are controlled, selective precipitation is conducted to remove phosphorus, the removal reaction is completed, filtering is conducted, washing with hot water is conducted, and cyclone drainage is conducted to realize solid-liquid separation. According to the method for removing phosphorus, phosphorus in the molybdenum and phosphorus mixed solution can be efficiently removed, and the method has the advantages of being low in cost and high in selectivity.

Description

technical field [0001] The invention relates to the field of rare metal separation science, in particular to a method for selective dephosphorization in a mixed solution of molybdenum and phosphorus. Background technique [0002] With the increasing consumption of high-quality tungsten-containing minerals, refractory scheelite has become an important mineral raw material for tungsten smelting, and the most representative one is the high-molybdenum and high-phosphorus scheelite produced in Luanchuan, Luoyang, Henan. This type of scheelite contains WO 3 25-35%, containing p5%-10%, containing molybdenum 1%-5%, with high utilization value. At present, the process of separating tungsten and molybdenum from molybdenum and tungsten-N1923 in the pretreatment liquid is processed by dilute hydrochloric acid pretreatment-concentrated hydrochloric acid decomposition to produce tungstic acid-weakly basic macroporous resin, which has low cost and high efficiency. advantage, but also has...

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Problems solved by technology

At present, the impurity removal process of molybdenum solution containing high phosphorus solution has the following problems: ① low efficiency and low phosphorus removal rate; Co-precipitation with phosphorus is easy to occur, and a large part of molybdenum enters the dephosphorization slag. Taking magnesium salt dephosphorization as an example, the Mo content in the magnesium salt slag after dephosphorization is as high as 2-8%; ③The operation is cumbersome and the investment in equipment is large (Taking extraction and separation of molybdenum and tungsten as an example, N263 is usually used as an extractant to separate molybdenum and phosphorus)

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