Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for producing secondary ammonium molybdate by molybdenum recovery material

A technology for ammonium paramolybdate and recycled materials, which is applied in the field of ammonium paramolybdate production, and can solve the problems of easily exceeding the standard of impurity elements, increasing the cost of recycling, and long acid leaching time, etc.

Inactive Publication Date: 2008-06-25
ZHUZHOU HARD ALLOY GRP CO LTD
View PDF0 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ammonium polymolybdate is produced by the above-mentioned method, and the acid leaching time of the method is quite long, and generally needs more than 30 days at least, and the use of nitric acid has higher requirements for equipment and pipelines, which not only increases the cost of recycling, but also produces Some impurity elements of ammonium polymolybdate are easy to exceed the standard. The molybdenum powder prepared with this ammonium polymolybdate has relatively poor performance, and generally can only be applied to the preparation of ordinary molybdenum products, such as primary products such as ferromolybdenum or steelmaking additives, and not Suitable for preparing molybdenum products or deep-processing products, such as molybdenum plugs, molybdenum slabs, molybdenum strips, molybdenum sheets, molybdenum wires, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: get 1000Kg through the molybdenum powder ground of selecting, rejecting various sundries, the powder reclaimed material (molybdenum content is 97.4%) such as dust collecting, pass through 40 mesh screens, at 480 ℃~500 ℃ temperature With the speed of 10Kg / h., roasting in multiple tubular muffle furnaces for 5h, according to calcined sand: pure water: ammonia water = 1: 0.8: 1.3, put calcined sand, pure water, and ammonia water in the leaching tank, Mix well at 70°C ~ 80°C, add sodium sulfide and activated carbon according to the conventional production process to purify under constant stirring and heating, when the specific gravity of ammonium molybdate solution reaches 1.18g / cm 3 Stop stirring and heating when the ammonium molybdate solution is clarified, suck the supernatant into the enamel acid settling tank, at a temperature of 40°C-60°C, control the pH value to 1.5-2.5 and use hydrochloric acid for acid settling. The ammonium polymolybdate precipitatio...

Embodiment 2

[0016] Embodiment 2: get 1000Kg through selecting, rejecting the pressed defective product of various sundries, the car cutting flake block, the oil-soaked billet etc. compact reclaimed material (molybdenum content is 92.3%), after crushing by crusher, powder Through the 80-mesh sieve, at a temperature of 480 ° C to 510 ° C at a speed of 6Kg / h. Taiwan, roasting in multiple tubular muffle furnaces for 7 hours, according to calcination: pure water: ammonia = 1: 0.7: 1.2, Put calcined sand, pure water, and ammonia water in the leaching tank, mix thoroughly at 70°C to 80°C, and add sodium sulfide and activated carbon to purify according to the conventional production process under constant stirring and heating. When ammonium molybdate solution The specific gravity reaches 1.20g / cm 3 Stop stirring and heating when the ammonium molybdate solution is clarified, suck the supernatant into the enamel acid settling tank, at a temperature of 40°C-60°C, control the pH value to 1.5-2.5 and ...

Embodiment 3

[0017] Embodiment 3: get 1000Kg and recycle materials (molybdenum content is 78.8%) such as molybdenum powder and molybdenum oxide trench, settling pond etc. after drying in drying room, selecting and rejecting all kinds of sundries, crusher crushing, powder passes through 80 mesh screens , at a temperature of 500°C to 540°C at a speed of 5Kg / h. Taiwan, roasted in multiple tubular muffle furnaces for 8h, according to calcined sand: pure water: ammonia water = 1:0.8:1.2, the calcined sand, pure Put water and ammonia water in the leaching tank, mix well at 70°C-80°C, add sodium sulfide and activated carbon according to the conventional production process under constant stirring and heating for purification, when the specific gravity of the ammonium molybdate solution reaches 1.22g / cm 3 Stop stirring and heating when the ammonium molybdate solution is clarified, suck the supernatant into the enamel acid settling tank, at a temperature of 40°C-60°C, control the pH value to 1.5-2....

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for producing secondary ammonium molybdate by using recycling material of molybdenum, which includes in turn: sorting and removing sundries; sieving at 40meshes to 100meshes; oxidizing and roasting in 480 DEG C to 550 DEG C for 5 to 8 hours; according to quality percentage of calcine: pure water: ammonia =1(0.7 to 0.9) : (1.2 to 1.4), sufficiently stirring and heating , lixiviating and purifying the calcine, the pure water and the ammonia in 70 DEG C to 80 DEG C; with proportion of ammonium molybdate solution reaching 1.18 g / cm<3>-1.22g / cm<3>, stopping stirring and heating; acid-precipitating supernatant in the temperature of 40 DEG C to 60 DEG C with hydrochloride and controlling solution pH value at 1.5 to 2.5; filtering acid precipitation slurry to obtain multiple ammonium molybdate precipitate and after evaporating and crystallizing, separating, parching, and blending, obtaining the secondary ammonium molybdate conforming with international standard. The invention has high recovery utilization ratio of molybdenum and the produced secondary ammonium molybdate can not be used for preparing molybdenum power as well as preparing products or deeply-processing molybdenum products.

Description

Technical field: [0001] The invention relates to a method for producing ammonium paramolybdate by utilizing molybdenum reclaimed materials, especially the production of ammonium paramolybdate by utilizing reclaimed materials such as molybdenum residual and sub-powder and dust collection, trench, sedimentation pool material or compacted car cutting chips Methods. Background technique: [0002] Ammonium molybdate (including ammonium dimolybdate, ammonium tetramolybdate, ammonium polymolybdate and ammonium paramolybdate, etc.) is mainly used in the production of metal molybdenum powder, and is also often used as a petrochemical catalyst, chemical reagent and production of chemical raw materials Wait. Metal molybdenum powder is mainly used to make metal products such as molybdenum processing materials, molybdenum plugs, molybdenum slabs, molybdenum strips, molybdenum sheets, and molybdenum wires. In the smelting and production of molybdenum, the production process of metal mol...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01G41/00C01C1/00
Inventor 田伟李光宗付崇伟
Owner ZHUZHOU HARD ALLOY GRP CO LTD