Method for synergistically removing silicon in tungsten smelting

A technology of silicon agent and tungsten ore, applied in the field of tungsten metallurgy, can solve the problem of high cost of silicon removal

Pending Publication Date: 2021-05-28
XIAMEN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, the present invention proposes a method for synergistic silicon removal in tungsten sme

Method used

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  • Method for synergistically removing silicon in tungsten smelting
  • Method for synergistically removing silicon in tungsten smelting
  • Method for synergistically removing silicon in tungsten smelting

Examples

Experimental program
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Effect test

Embodiment 1

[0047] According to the method for synergistic silicon removal in tungsten smelting according to the embodiment of the present invention, the specific silicon removal process is as follows:

[0048] First, put 6.5m into the reaction tank 3 Water, turn on stirring, and add 0.45m in turn 3 Sodium aluminate solution (in which Al 3+ The concentration of 34.3g / l), 80kg of industrial grade magnesium oxide (MgO≥90%) and 1100kg of sodium phosphate, then put in 5000kg of tungsten ore, the tungsten ore WO 3 The content is 26.43wt%, SiO 2 The content of the powder was 2.23 wt %, and the obtained first slurry was fed to the autoclave after stirring sufficiently. The autoclave was heated with high-pressure steam, and the temperature was 170 °C and the pressure was 0.97 MPa for 1.5 hours of heat preservation and pressure retention. After discharging, calcium carbonate is added to the feed solution to remove phosphorus (the mass ratio of phosphorus content in the feed solution to calcium...

Embodiment 2

[0050] According to the method for synergistic silicon removal in tungsten smelting according to the embodiment of the present invention, the specific silicon removal process is as follows:

[0051] First, put 6 m into the reaction tank 3 Water, turn on stirring, and add 0.45m in turn 3 Sodium aluminate solution (where A l3+ The concentration of 35.7g / l), 40kg of industrial grade magnesium oxide (MgO≥90%) and 1200kg of sodium phosphate, and then put in 5000kg of tungsten ore, the tungsten ore WO 3 The content is 29.59wt%, SiO 2 The content of the powder was 2.29 wt %, and the obtained first slurry was fed to the autoclave after stirring sufficiently. The autoclave was heated with high-pressure steam, and the reaction was kept under pressure for 1.5 hours at a temperature of 175 °C and a pressure of 0.95 MPa. After discharging, calcium carbonate is added to the feed solution to remove phosphorus (the mass ratio of phosphorus content in the feed solution to calcium carbonate...

Embodiment 3

[0053] According to the method for synergistic silicon removal in tungsten smelting according to the embodiment of the present invention, the specific silicon removal process is as follows:

[0054] First, put 7m into the reaction tank 3 Water, turn on stirring, and add 0.45m in turn 3 Sodium aluminate solution (in which Al 3+ The concentration of 38.7g / l), 20kg of industrial grade magnesium oxide (MgO≥90%) and 1250kg of sodium phosphate, and then put in 5000kg of tungsten ore, the tungsten ore WO 3 The content is 30.56wt%, SiO 2 The content of the powder was 2.20 wt %, and the obtained first slurry was fed to the autoclave after stirring sufficiently. The autoclave was heated with high-pressure steam, and the reaction was kept under pressure for 1.5 hours at a temperature of 173 °C and a pressure of 0.97 MPa. After discharging, calcium carbonate is added to the feed solution to remove phosphorus (the mass ratio of phosphorus content in the feed solution to calcium carbona...

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Abstract

The invention discloses a method for synergistically removing silicon in tungsten smelting, which comprises the following steps: S1, mixing tungsten ores with a silicon removal agent, sodium phosphate and water to obtain first slurry; S2, treating the first slurry under the conditions of a preset temperature and preset pressure to obtain treated feed liquid; S3, adding a phosphorus removal agent into the feed liquid to obtain second slurry; and S4, filtering the second slurry to obtain tungsten slag and a concentrated sodium tungstate material. The silicon removal agent comprises sodium aluminate and magnesium oxide. According to the method for synergistically removing silicon in tungsten smelting, the sodium aluminate and the magnesium oxide are used as the silicon removal agent for synergistically removing silicon, so that no new impurity is introduced due to reaction with other impurities, and the sodium aluminate can also play a role of a flocculating agent, and thus, generated insoluble substance precipitation particles become larger and are easy to separate out from the slurry, a better silicon removal effect is achieved, and the quality of product tungsten is improved. Moreover, the magnesium oxide is low in price, so that the silicon removal cost of the tungsten can be effectively saved, and the production cost of the tungsten is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of tungsten metallurgy, in particular to a method for synergistic silicon removal in tungsten smelting. Background technique [0002] Silicon is an extremely common element, but it rarely occurs in nature in the form of elemental substances, but in the form of complex silicates or silica, which widely exists in rocks, gravels, and dust. With the continuous development and utilization of tungsten resources, the grade of tungsten ore is declining, and the composition is more and more complex. This increases the difficulty of beneficiation and metallurgy from the processing of raw materials, and with the rapid development of science and technology, users have put forward higher requirements for product purity. The sodium tungstate solution produced by pyrolysis of tungsten concentrate and then alkali decomposition usually contains impurities such as silicon, phosphorus, arsenic, molybdenum and sulfur. The imp...

Claims

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Application Information

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IPC IPC(8): C22B34/36C22B3/44C22B3/42
CPCC22B34/36C22B3/44C22B3/42Y02P10/20
Inventor 杨正许圳安王海军
Owner XIAMEN TUNGSTEN
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