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Treatment method for high-phosphorus high-molybdenum complex scheelite

A processing method and technology for scheelite, which is applied in the processing field of complex scheelite with high phosphorus and high molybdenum, and achieves the effects of efficient separation, convenient operation and simple processing equipment

Active Publication Date: 2016-04-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is how to process high-phosphorus, high-molybdenum complex scheelite, realize comprehensive recovery of tungsten, molybdenum and phosphorus in minerals, and provide a processing method for high-phosphorus, high-molybdenum complex scheelite

Method used

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  • Treatment method for high-phosphorus high-molybdenum complex scheelite

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Experimental program
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Effect test

Embodiment 1

[0037] See figure 1 , The grade of the treated high-phosphorus and high-molybdenum scheelite is P 2 O 5 12.4%, WO 3 29.7%, Mo2.8%, specific operating conditions and results are shown in Table 1. The obtained tungstic acid adopts the technical route of ammonia dissolution-purification and removal-evaporation crystallization to prepare APT to recover tungsten; to obtain ammonium phosphomolybdate crystals, the technical route of preparing ammonium tetramolybdate by ammonia dissolution-purification and removal-acid precipitation crystallization to recover molybdenum ; The obtained contains nitric acid, phosphoric acid and NH 4 + The ammonium phosphomolybdate crystallization mother liquor adopts the technical route of ammonia water neutralization-vacuum evaporation-granulation drying to prepare nitrophosphate fertilizer to recover phosphorus.

[0038] Table 1: Operating conditions and experimental results of Example 1

[0039]

Embodiment 2

[0041] See figure 1 , The grade of the processed high-phosphorus and high-molybdenum scheelite is P 2 O 5 12.4%, WO 3 29.7%, Mo2.8%, specific operating conditions and results are shown in Table 2. The obtained tungstic acid adopts the technical route of ammonia dissolution-purification and removal-evaporation crystallization to prepare APT to recover tungsten; to obtain ammonium phosphomolybdate crystals, the technical route of preparing ammonium tetramolybdate by ammonia dissolution-purification and removal-acid precipitation crystallization to recover molybdenum ; The obtained contains nitric acid, phosphoric acid and NH 4 + The ammonium phosphomolybdate crystallization mother liquor adopts the technical route of ammonia water neutralization-vacuum evaporation-granulation drying to prepare nitrophosphate fertilizer to recover phosphorus.

[0042] Table 2: Operating conditions and experimental results of Example 2

[0043]

[0044]

Embodiment 3

[0046] See figure 1 , The grade of the processed high-phosphorus and high-molybdenum scheelite is P 2 O 5 16.2%, WO 3 20.3%, Mo3.1%, specific operating conditions and results are shown in Table 3. The obtained tungstic acid adopts the technical route of ammonia dissolution-purification and removal-evaporation crystallization to prepare APT to recover tungsten; to obtain ammonium phosphomolybdate crystals, the technical route of preparing ammonium tetramolybdate by ammonia dissolution-purification and removal-acid precipitation crystallization to recover molybdenum ; The obtained contains nitric acid, phosphoric acid and NH 4 + The ammonium phosphomolybdate crystallization mother liquor adopts the technical route of ammonia water neutralization-vacuum evaporation-granulation drying to prepare nitrophosphate fertilizer to recover phosphorus.

[0047] Table 3: Operating conditions and experimental results of Example 3

[0048]

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Abstract

The invention discloses a treatment method for high-phosphorus high-molybdenum complex scheelite. The treatment method includes the following steps that phosphorus minerals in the high-phosphorus high-molybdenum scheelite are selectively leached out through nitric acid, and through filtration, a mixed solution of the high-molybdenum scheelite and phosphoric acid nitric acid containing molybdenum is obtained; sulfuric acid is added to the solution for decalcification treatment; after decalcification, NH4+ is supplemented into the solution to prepare ammonium phosphomolybdate trihydrate crystals, and the ammonium phosphomolybdate trihydrate crystals are subjected to the working procedures of ammonia neutralization, purification and acid precipitation to prepare ammonium tetramolybdate; crystallized mother liquid is subjected to the working procedures of neutralization, vacuum evaporation, pelletizing and drying to prepare nitric phosphate; the high-molybdenum scheelite subjected to nitric acid intensified leaching dephosphorizing treatment is adopted and tungstic acid obtained through filtration is subjected to ammonium hydroxide solution conversion and purification impurity removal to prepare ammonium paratungstate; and the nitric acid is supplemented into a leaching solution and the dephosphorizing working procedure of the high-phosphorus high-molybdenum scheelite is executed again. By the adoption of the treatment method, the high-phosphorus high-molybdenum complex scheelite can be treated, tungsten, molybdenum and phosphorus in the minerals are comprehensively recycled, treatment equipment is simple, operation is convenient, and industrialization is easy to achieve.

Description

Technical field [0001] The invention relates to the technical field of hydrometallurgy, and more specifically to a method for processing high-phosphorus and high-molybdenum complex scheelite. Background technique [0002] my country is a big country with tungsten resources, and its resource reserves are the largest in the world, and more than 2 / 3 of the resources are scheelite. However, my country's scheelite resources are few rich ores, with a grade of more than 80% and less than 0.4%, and their composition is complex. A considerable part of them are co-associated ores, which are difficult to recycle. For example, Luanchuan Mine, the second largest scheelite mine in my country, has a tungsten reserve of 620,000 tons, but the grade of the original ore is only 0.06%, and a large amount of valuable elements of molybdenum and phosphorus (Mo2~5%, WO 3 10~30%, Mo / WO 3 The mass ratio is as high as 10% or more, and contains P 2 O 5 10%-30%, can also be regarded as low-grade phosphate ro...

Claims

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Application Information

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IPC IPC(8): C22B34/36
CPCC22B34/36
Inventor 李江涛赵中伟
Owner CENT SOUTH UNIV
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