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Method for preparing ammonium paratungstate by utilizing low-grade scheelite concentrate

A low-grade ammonium paratungstate technology, which is applied in the preparation of tungsten compounds, chemical instruments and methods, tungsten compounds, etc., can solve the problems of low utilization rate of mine resources and low decomposition rate of scheelite, so as to reduce alkalinity and avoid Wear consumption, low pressure effect

Inactive Publication Date: 2019-03-08
江西五矿高安有色金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology of high-power alkali decomposition scheelite is mature, the process is simple, and it has great advantages. However, the decomposition rate of scheelite in the process is not high, and a large amount of decomposition slag is produced. The content of tungsten trioxide in the slag is high, and the mine resources The utilization rate of tungsten is not high, and because the ore sources contain high impurities such as molybdenum, it is also crucial to separate and remove molybdenum in the extraction and metallurgy of tungsten

Method used

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  • Method for preparing ammonium paratungstate by utilizing low-grade scheelite concentrate
  • Method for preparing ammonium paratungstate by utilizing low-grade scheelite concentrate
  • Method for preparing ammonium paratungstate by utilizing low-grade scheelite concentrate

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Embodiment 1

[0022] A kind of method that the present invention proposes utilizes low-grade scheelite concentrate to prepare ammonium paratungstate, comprising the following steps:

[0023] S1. Add sodium hydroxide solution to the low-grade scheelite concentrate for mechanical grinding until the average particle size is 100 mesh, control the alkalinity of the pulp to 400g / L, and then transfer it to an alkali boiling reaction kettle for heating by far-infrared radiation. Alkali pressure cooking treatment, the pressure in the alkali boiling reaction kettle is 0.2Mpa, the temperature is 160°C, and the holding time is 1.5h. The obtained pulp is filtered with a filter press, washed with water, and a sodium tungstate solution with a relatively dilute concentration is obtained;

[0024] Here, the combination of mechanical grinding and far-infrared radiation heating is used to activate the ore to promote the decomposition of scheelite. Among them, the mechanical grinding can improve the surface act...

Embodiment 2

[0035] A kind of method that the present invention proposes utilizes low-grade scheelite concentrate to prepare ammonium paratungstate, comprising the following steps:

[0036] S1. Add sodium hydroxide solution to the low-grade scheelite concentrate for mechanical grinding until the average particle size is 200 mesh, control the alkalinity of the pulp to 470g / L, and then transfer it to an alkali boiling reaction kettle for heating by far-infrared radiation. Alkali pressure cooking treatment, the pressure in the alkali boiling reaction kettle is 0.5Mpa, the temperature is 180°C, and the holding time is 2.5h. The obtained pulp is filtered with a filter press, washed with water, and a sodium tungstate solution with a relatively dilute concentration is obtained;

[0037] Here, the combination of mechanical grinding and far-infrared radiation heating is used to activate the ore to promote the decomposition of scheelite. Among them, the mechanical grinding can improve the surface act...

Embodiment 3

[0048] A kind of method that the present invention proposes utilizes low-grade scheelite concentrate to prepare ammonium paratungstate, comprising the following steps:

[0049] S1. Add sodium hydroxide solution to the low-grade scheelite concentrate for mechanical grinding until the average particle size is 140 mesh, control the alkalinity of the pulp to 550g / L, and then transfer it to an alkali boiling reaction kettle for heating by far-infrared radiation. Alkali pressure cooking treatment, the pressure in the alkali boiling reaction kettle is 0.3Mpa, the temperature is 165°C, and the holding time is 2.0h. The obtained pulp is filtered with a filter press, washed with water, and a sodium tungstate solution with a relatively dilute concentration is obtained;

[0050] Here, the combination of mechanical grinding and far-infrared radiation heating is used to activate the ore to promote the decomposition of scheelite. Among them, the mechanical grinding can improve the surface act...

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Abstract

The invention discloses a method for preparing ammonium paratungstate by utilizing a low-grade scheelite concentrate, and relates to the technical field of metallurgy chemical industry. The method comprises the following steps of adding a sodium hydroxide solution into the low-grade scheelite concentrate, mechanically grinding, then adopting far-infrared radiation heating for carrying out alkali autoclave treatment, filter pressing the obtained ore pulp through a filter press, and water washing to obtain a sodium tungstate solution; concentrating and crystallizing the sodium tungstate solutionto obtain a sodium tungstate crystal; dissolving the sodium tungstate crystal into water to prepare sodium tungstate pre-fluid for ion exchange; adopting strong-base anion exchange resin for carryingout ion exchange adsorption on the sodium tungstate solution, flushing, and desorbing tungsten by using mixed liquor of ammonium chloride and ammonium hydroxide; adding (NH4)2S into the desorbed solution, vulcanizing, adding a CuSO4 solution for removing molybdenum, filtering, concentrating, crystallizing, and drying to obtain the ammonium paratungstate. The leaching efficiency of scheelite is high, impurity components such as trace metal cation in the solution can be effectively removed, the molybdenum removal rate is high, and the purity of the obtained ammonium paratungstate is high.

Description

technical field [0001] The invention relates to the technical field of metallurgy and chemical industry, in particular to a method for preparing ammonium paratungstate by using low-grade scheelite concentrate. Background technique [0002] my country is a country with large tungsten mineral resources. Among the tungsten resource reserves, black tungsten accounts for about 20%, scheelite accounts for about 70%, and black and white tungsten mixed ore accounts for about 10%. However, since the 1970s, with the gradual depletion of wolframite in my country, the resource situation of the tungsten metallurgical industry has undergone major changes. Mainly tungsten ore. However, since high-quality and high-grade tungsten resources are becoming less and less, the efficient utilization of scheelite is very important. At present, a series of mature technologies have been developed, especially the process of decomposing scheelite with high-power alkali, which is widely used. The techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00
CPCC01G41/00C01G41/003C01P2006/80
Inventor 艾永红陈有生
Owner 江西五矿高安有色金属有限公司
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