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Technology of deep purification and impurity removal of ammonium tungstate or ammonium molybdate solution

A deep purification and ammonium molybdate technology, which is applied in the fields of ammonium paramolybdate production by molybdenum wet method and ammonium paratungstate production by tungsten wet method, can solve the problems of complicated operation, poor purification and impurity removal effect, etc., and achieve small loss of tungsten and save nitric acid And ammonia water, easy to filter and clean the effect

Active Publication Date: 2014-06-25
成都西顿硬质合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a deep purification and impurity removal process for ammonium tungstate or ammonium molybdate solution for the problems of poor purification and impurity removal effects of ammonium tungstate and ammonium molybdate solutions in the above-mentioned prior art

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  • Technology of deep purification and impurity removal of ammonium tungstate or ammonium molybdate solution

Examples

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Effect test

Embodiment 1

[0024] Embodiment 1 This embodiment is the deep purification and impurity removal process of ammonium molybdate solution

[0025] Including the following steps:

[0026] Step (1): 500l (P: 0.2g / l) of ammonium molybdate solution obtained by decomposing ore, adding magnesium chloride (MgCl 2 ·7H 2 (2) 1.868kg, obtain ammonium phosphate magnesium salt precipitation, filter precipitation, magnesium ion content is 0.25g / l in the filtrate;

[0027] Step (2): The filtrate enters the D850 resin adsorption column for adsorption, until the black T indicator does not change color, and collects the ammonium molybdate solution for purification and removal of impurities. The aspect ratio of the D850 resin adsorption column is 4:1, and the solution flow rate is 10cm / min.

[0028] Detect and collect the ammonium molybdate solution that obtains, and purity is P:0.0008g / l, Mg: trace. Detection method: phosphorous molybdenum blue spectrophotometry for phosphorus; EDTA titration for calcium a...

Embodiment 2

[0029] Embodiment 2 This embodiment is the deep purification and impurity removal process of ammonium molybdate solution

[0030] Including the following steps:

[0031] Step (1): Add magnesium chloride (MgCl 2 .7H 2 O) 2.098㎏, to obtain magnesium ammonium phosphate precipitate, filter the precipitate, and the magnesium ion content in the filtrate is 0.30g / l;

[0032] Step (2): The filtrate enters the D850 resin for adsorption until the acidic blue K indicator does not change color, and the purified ammonium molybdate solution is collected. The aspect ratio of the D850 resin adsorption column is 5:1, and the filtrate flow rate is 12cm / min.

[0033] Detect and collect the ammonium molybdate solution that obtains, and purity is P:0.0008g / l, Mg: trace. Detection method: phosphorous molybdenum blue spectrophotometry for phosphorus; EDTA titration for calcium and magnesium.

Embodiment 3

[0034] Example 3 This example is the deep purification and impurity removal process of ammonium tungstate solution

[0035] Including the following steps:

[0036] Step (1): Add 500l of crude ammonium tungstate solution (P: 0.12g / l) obtained by ore decomposition, add magnesium chloride (MgCl 2 .7H 2 O) 2.040kg, to obtain magnesium ammonium phosphate precipitate, filter the precipitate, and the magnesium ion content in the filtrate is 0.35g / l;

[0037] Step (2): The filtrate enters the D851 resin for adsorption, until the acidic blue K indicator does not change color, and collects the ammonium tungstate solution for purification and removal of impurities. The height-to-diameter ratio of the D851 resin adsorption column is 3:1, and the filtrate flow rate is 5cm / min.

[0038] Detect and collect the ammonium tungstate solution obtained, the purity is P: 0.0008g / l, Mg: trace. Detection method: phosphorous molybdenum blue spectrophotometry for phosphorus; EDTA titration for calc...

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Abstract

The invention relates to the technical fields of production of ammonium paratungstate by a tungsten wet method and a molybdenum wet method, and particularly discloses a technology of deep purification and impurity removal of ammonium tungstate or ammonium molybdate solution. The technology comprises the following steps of: (1) adding magnesium chloride in a crude ammonium tungstate solution or crude ammonium paramolybdate solution obtained through ore-opening to obtain magnesium salt precipitate, filtering the precipitate, wherein magnesium chloride is added enough so that the magnesium content in filtrate is not less than 0.25g / l; and (2): entering the filtrate in D850, D750, D851 or D 751 resin for adsorption till color is not change through complex black T or acidic complex blue K indication, and collecting ammonium tungstate solution or ammonium paramolybdate solution which is purified and has impurities removed. The technology of deep purification and impurity removal is simple and feasible in operation, and the purity of the obtained ammonium tungstate solution or ammonium paramolybdate solution is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of ammonium paratungstate production by tungsten wet method and ammonium paramolybdate production by molybdenum wet method, and particularly relates to a deep purification and impurity removal process for ammonium tungstate solution and ammonium molybdate solution. Background technique [0002] Ammonium paratungstate is an important intermediate product in the tungsten hydrometallurgy process. Decomposition of tungsten concentrate-ammonium paratungstate production process mainly includes ore decomposition, transformation to obtain crude ammonium tungstate solution, removal of impurities from crude ammonium tungstate solution, crystallization to obtain ammonium paratungstate and crystallization mother liquor, and recycling of crystallization mother liquor. The crude ammonium tungstate solution obtained through transformation needs to be purified to remove impurities because it contains P, As, and Si impuritie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B3/24C22B34/34C22B34/36
CPCY02P10/20
Inventor 袁茂强肖新志
Owner 成都西顿硬质合金有限公司