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Method for recycling all chemical components in filament melting molybdenum-containing waste acid

A technology of filament filament and chemical composition, applied in chemical instruments and methods, inorganic chemistry, molybdenum compounds, etc., can solve the problems of inability to further improve molybdenum recovery rate, sale, and inability to be used as commercial-grade products, etc. The effect of improving product purity and improving molybdenum recovery rate

Active Publication Date: 2013-09-11
杭州临安慧尔钼业科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, what this method obtains is ammonium polymolybdate precipitation, which cannot be sold as a commercial grade product, and due to the limitation of the treatment process, the recovery rate of molybdenum cannot be further improved

Method used

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  • Method for recycling all chemical components in filament melting molybdenum-containing waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0053] On the basis of Example 1, step 2) recovery of molybdenum from the press filtrate, the pH value of the molybdenum-containing filtrate is 4.0-5.0.

[0054] The macroporous styrene-based weakly basic anion exchange resin produced by Xi'an Lanxiao Technology Co., Ltd., Tianjin Nankai Hecheng Technology Co., Ltd., Zhejiang Zhengguang Resin Company or Shanghai Jinyang Resin Technology Company was selected. Soak the above-mentioned anion-exchange resin with 1% nitric acid solution for 1 hour, then put it into the F40'450mm exchange column, add the above-mentioned embodiment 1 step 2) from the exchange column above the filter press, and the adding speed is controlled so that the filtrate and the ion-exchange resin The contact time is about 20 minutes. Use a test tube for every 5 mL of the exchange column effluent, and use the spectrophotometric analysis method to monitor the molybdenum content in each test tube. When the molybdenum content increases from the blank level to the...

Embodiment 3

[0056] On the basis of Example 1, step 2) recovery of molybdenum from the press filtrate, the pH value of the molybdenum-containing filtrate is 4.0-5.0.

[0057] Select the macroporous acrylic acid weakly basic anion exchange resin produced by Xi'an Lanxiao Technology Co., Ltd., Tianjin Nankai Hecheng Technology Co., Ltd., Zhejiang Zhengguang Resin Company or Shanghai Jinyang Resin Technology Company. Soak the above-mentioned anion exchange resin with 1% nitric acid solution for 1 hour, then put it into the F40′450mm exchange column, add the press filtrate of the above-mentioned process route 1 from the top of the exchange column, and control the adding speed so that the contact time between the filtrate and the ion exchange resin is about 20min. Use a test tube for every 5 mL of the exchange column effluent, and use the spectrophotometric analysis method to monitor the molybdenum content in each test tube. When the molybdenum content increases from the blank level to the begi...

Embodiment 4

[0059] On the basis of Example 1, in step 9) recovery of the molybdenum mixture in the centrifuge, the pH value of the molybdenum-containing filtrate is 6.9-7.2.

[0060] Select the macroporous acrylic acid weakly basic anion exchange resin produced by Xi'an Lanxiao Technology Co., Ltd., Tianjin Nankai Hecheng Technology Co., Ltd., Zhejiang Zhengguang Resin Company or Shanghai Jinyang Resin Technology Company. Soak the above-mentioned anion exchange resin with 1% nitric acid solution for 1 hour, then put it into the F40′450mm exchange column, add the above-mentioned embodiment 1 step 9) centrifugate mixture from the top of the exchange column, and control the adding speed so that the filtrate and ion The exchange resin contact time is about 20min. Use a test tube for every 5 mL of the exchange column effluent, and use the spectrophotometric analysis method to monitor the molybdenum content in each test tube. When the molybdenum content increases from the blank level to the beg...

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Abstract

The invention relates to a method for recycling all chemical components in a filament melting molybdenum-containing waste acid. The method comprises the following steps of: 1) neutralization: slowly adding liquid ammonia to the waste acid and stopping adding the liquid ammonia until pH is in the range from 4.8 to 5.5; 2) filtering: generating a filter cake and a filtrate; 3) ammonia leaching: dissolving the filter cake by using ammonia water; 4) filtering: removing few insoluble impurities by using filter cloth; 5) acid precipitation and centrifuging: obtaining ammonium molybdate product; 6) ion exchange / ammonia desorption; 7) evaporative crystallization: infiltrating the liquid obtained through ion exchange into a two-effect evaporator for evaporative crystallization, thereby obtaining a mixture of ammonium sulfate and ammonium nitrate containing a trace of ammonium molybdate, wherein the mixture is used as a molybdenum-containing chemical fertilizer product. The overall process route of the method provided by the invention realizes recycling of all chemical components of the molybdenum-containing waste acid; the production process is free of pollution and green.

Description

technical field [0001] The invention relates to the field of renewable resources, in particular to a method for secondary recycling of all chemical components in molybdenum-containing waste acid in filaments. Background technique [0002] Energy-saving lamps are known as a new light source for green lighting and become one of the development directions of energy-saving light sources in the 21st century. Mo in the energy-saving filament production industry is mainly used as the winding shaft of tungsten (W) wire, and then HNO 3 and H 2 SO 4 The mixed acid dissolves the Mo mandrel, dissolves the metal Mo into the strong acid solution, the W wire is shaped, the Mo changes from the reduced state to the oxidized state, and the oxidized Mo is lost in the waste acid of the chemical wire. On the one hand, molybdenum (Mo) is a precious rare metal with a high melting point, which is widely used and expensive, but the light source of molybdenum mines in the world is limited; Enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/00C05G1/00
Inventor 刘子阳李贤洪
Owner 杭州临安慧尔钼业科技有限公司
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