Process for producing molybdenum trioxide through spiral flow fluidized calcination

A technology of molybdenum trioxide and boiling calcination, applied in the direction of molybdenum oxide/molybdenum hydroxide, etc., can solve the problems of unfavorable recovery of sulfuric acid, high equipment maintenance costs, small contact specific surface area, etc., to achieve easy automatic control and good calcination quality , Improve the effect of leaching rate and recovery rate

Inactive Publication Date: 2010-08-11
江西省鼎力金属有限公司
View PDF2 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other impurities in molybdenum concentrate are oxides and salts. Due to the small specific surface area of ​​gas-solid contact in the furnace, temperature control is difficult, melting agglomeration is easy to occur, and the reaction is uneven. The time is as long as 8 to 10 hours,

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

Example Embodiment

[0011] Example 1

[0012] The specific process of this embodiment is as follows:

[0013] 1. Preheat the molybdenum concentrate to remove the water and oil of the mineral, and make the material into a gas-solid mixed state;

[0014] 2. The preheated molybdenum concentrate is sent to the boiling rotary calciner in a gas-solid mixed state, so that the gas-solid mixing ratio in the calciner reaches 40:1, and the temperature is 500-800℃;

[0015] 3. The calcined flue gas enters the air-cooled heat exchanger, so that the flue gas is cooled to below 250°C, so that the dust can be collected in one step.

[0016] 4. Bag dust collection for gas-solid separation, recovery of calcined sand whose main component is molybdenum trioxide, and gas recovery to produce sulfuric acid.

Example Embodiment

[0017] Example 2

[0018] The specific process of this embodiment is as follows:

[0019] 1. Preheat the molybdenum concentrate to remove the water and oil of the mineral, and make the material into a gas-solid mixed state;

[0020] 2. The preheated molybdenum concentrate is sent to the boiling rotary calciner in a gas-solid mixed state, so that the gas-solid mixing ratio in the calciner reaches 40:0.8, and the temperature is 600-700℃;

[0021] 3. The calcined flue gas enters the air-cooled heat exchanger to cool the flue gas to below 230°C, so as to facilitate one-step bag dust collection.

[0022] 4. Bag dust collection for gas-solid separation, roasting sand recovery, gas recovery to produce sulfuric acid.

Example Embodiment

[0023] Example 3

[0024] The specific process of this embodiment is as follows:

[0025] 1. Preheat the molybdenum concentrate to remove the water and oil of the mineral, and make the material into a gas-solid mixed state;

[0026] 2. The preheated molybdenum concentrate is sent to the boiling rotary calciner in a gas-solid mixed state, so that the gas-solid mixing ratio in the calciner reaches 40:0.5, and the temperature is 550-800℃;

[0027] 3. The calcined flue gas enters the air-cooled heat exchanger, so that the flue gas is cooled to below 300°C, so that the dust can be collected in one step.

[0028] 4. Bag dust collection for gas-solid separation, roasting sand recovery, gas recovery to produce sulfuric acid.

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 discloses a process for producing molybdenum trioxide through spiral flow fluidized calcination. The process mainly comprises the following steps of: preheating molybdenum concentrate to make the materials in a gas-solid mixed state; conveying the preheat molybdenum concentrate to a fluidized rotary calciner to make the gas-solid mixed ratio in the calciner to be 40: 0.5-1 and temperature to be 50 to 800 DEG C; allowing the calcined smoke to enter an air-cooled heat exchanger to cool the smoke to below 300 DEG C; and collecting dust by using a cloth bag to perform gas-solid separation to recycle the calcined sand. Due to the process, the molybdenum metal grade reaches over 60 percent and the recovery rate reaches 99.5 percent after the molybdenum concentrate is calcined. Compared with the convention calcination, the process has more complete oxidation so as to be beneficial for producing molybdate and improve leaching rate and recovery rate. The process is performed in a fully-sealed system and has the advantages of high recovery rate, environmental friendliness, convenient automatic control, simpliness, little time consumption, low energy consumption, good calcining quality, improvement on production efficiency and reduction in labor intensity of operators.

Description

technical field [0001] The invention relates to a process for preparing molybdenum trioxide, in particular to a process for preparing molybdenum trioxide by swirling boiling calcining. Background technique [0002] Molybdenum concentrate is calcined to produce molybdenum trioxide calcined sand. Now the commonly used calcining equipment includes: rotary kiln, multi-hearth furnace and fluidized fluidized furnace. Both heat the molybdenum concentrate to above 500°C, and pass air into the furnace to burn the molybdenum concentrate and decompose it into molybdenum oxide and sulfur dioxide. Other impurities in molybdenum concentrate are oxides and salts. Due to the small specific surface area of ​​gas-solid contact in the furnace, temperature control is difficult, melting agglomeration is easy to occur, and the reaction is uneven. The time is as long as 8 to 10 hours, and the production capacity is low. The concentration of sulfur dioxide produced by the reaction is lower than 1....

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): C01G39/02
Inventor 李汪洲
Owner 江西省鼎力金属有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap