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

Method for improving oxidization efficiency in vanadium slag roasting process

A technology of oxidation efficiency and roasting, which is applied in the field of vanadium chemical industry and metallurgy, can solve the problems of inability to recover metallic iron, low recovery rate of vanadium conversion rate, and reduced production efficiency, so as to improve oxidation efficiency and oxidation effect, and strengthen gas-solid mass transfer. effect, the effect of improving conversion rate and recovery rate

Active Publication Date: 2015-06-10
HEBEI IRON AND STEEL
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The recovery rate of vanadium in the sodium roasting process is low, the recovery rate of vanadium in a single roasting is about 70%, and the recovery rate of vanadium after multiple roasting is only 80%; the roasting temperature is high (750-850 ° C), and multiple roasting is required , high energy consumption; in the roasting process will produce harmful HCl, Cl 2 At the same time, the high-temperature roasting process is prone to material sintering and kiln ring formation, which hinders the further oxidation of vanadium, reduces the conversion rate of vanadium, and reduces production efficiency.
[0004] Chinese patent CN1082617A proposes to treat the high-temperature vanadium slag obtained by blowing by blowing oxygen directly at 900~1300°C to promote the oxidation of low-priced vanadium in the slag to vanadium pentoxide. , The vanadium in the slag is leached under the oxygen partial pressure. This method does not need to be roasted at high temperature again after the vanadium slag is cooled, the energy consumption is greatly reduced, and the environmental pollution caused by sodium roasting is avoided, but there is metal iron that cannot be recovered, and the recovery of vanadium low rate problem
[0005] In summary, in the prior art, there are generally problems such as high roasting temperature, low vanadium conversion rate and recovery rate in the process of pyrovanadium extraction, toxic gas and a large amount of acidic ammonia nitrogen wastewater discharge during the vanadium recovery process; at the same time, the high-temperature roasting process is easy The phenomenon of material sintering and kiln body ringing occurs, which hinders the further oxidation of vanadium and reduces production efficiency

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for improving oxidization efficiency in vanadium slag roasting process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] by Φ Take 2.6m×50m rotary kiln as an example, the initial feeding volume is 15t / h:

[0024] (1) Air volume control: the combustion air volume is 0.5 times the gas volume, kiln head O 2 Volume content is 16%, kiln tail O 2 The volume content is 14%, the roasting time is 5 hours, and industrial oxygen is added to the combustion-supporting air duct of the rotary kiln burner.

[0025] (2) Add auxiliary agent: mix roasted vanadium slag, Fe 2 o 3 The content is 45%, and the added amount is 0.5% of the mass of vanadium slag. The sintered pellets of vanadium slag are added at the kiln tail, and the added amount is 0.5% of the mass of vanadium slag.

[0026] (3) Segmented temperature control: the temperature of the first section of the kiln tail is controlled at 450~500°C, the temperature of the second section adjacent to the kiln tail is controlled at 500~650°C, the temperature of the first section of the kiln is controlled at 350~400°C, and the temperature of the second s...

Embodiment 2

[0030] by Φ Take the 3.5m×90m rotary kiln as an example, the initial feeding volume is 17t / h:

[0031] (1) Air volume control: the combustion air volume is 2.0 times the gas volume, kiln head O 2 Volume content is 18%, kiln tail O 2 The volume content is 16%, and the roasting time is 1h.

[0032] (2) Add auxiliary agent: mix NaCl and CaCl into the vanadium slag material 2 Equal mass mixture, the addition amount is 10% of the mass of vanadium slag, and ceramic balls are added at the kiln tail, the addition amount is 10% of the mass of vanadium slag.

[0033] (3) Segmented temperature control: the temperature of the first section of the kiln tail is controlled at 400~450°C, the temperature of the second section adjacent to the kiln tail is controlled at 500~700°C, the temperature of the first section of the kiln is controlled at 350~400°C, and the temperature of the second section next to the kiln head is controlled at 350~400°C. The temperature of the second stage is contr...

Embodiment 3

[0037] by Φ Take the 4.5m×100m rotary kiln as an example, the initial feeding volume is 32t / h:

[0038] (1) Air volume control: the combustion air volume is 0.8 times the gas volume, kiln head O 2 Volume content is 25%, kiln tail O 2 The volume content is 20%, the roasting time is 4 hours, and industrial oxygen is added to the combustion-supporting air duct of the rotary kiln burner.

[0039] (2) Add auxiliary agent: mix NaClO into the vanadium slag material, the addition amount is 5% of the vanadium slag mass, and add vanadium slag sintered pellets at the kiln tail, the addition amount is 10% of the vanadium slag mass.

[0040] (3) Segmented temperature control: the temperature of the first section of the kiln tail is controlled at less than 450~500°C, the temperature of the second section next to the kiln tail is controlled at 500~750°C, the temperature of the first section of the kiln is controlled at 450~500°C, and the temperature of the next section of the kiln head is...

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 method for improving oxidization efficiency in a vanadium slag roasting process. The method comprises the following process steps: (1) uniformly mixing and introducing the vanadium slag into a rotary kiln to perform oxygen-enriched roasting, wherein air quantity of combustion air is 0.5-2 times of coal gas amount; (2) in the roasting process, adding auxiliaries into the roasted materials to increase the material porosity and gas permeability; (3) performing segmented temperature control on the kiln body; (4) regulating the thickness of a material layer to be 1 / 50-1 / 5 the diameter of the kiln body, ending the roasting after 1-5 hours to obtain roasted clinker. According to the method disclosed by the invention, a method of combining oxygen-enriched segmented roasting with material layer regulating is adopted to strengthen gas-solid mass transfer efficiency of the vanadium slag roasting process., so that the phenomena of material sintering and kiln body ring forming are greatly reduced, the oxidization efficiency and the oxidization effect of the vanadium slag roasting process are improved, and the transformation rate of the vanadium slag is increased.

Description

technical field [0001] The invention belongs to the technical field of vanadium chemical industry and metallurgy, in particular to a method for improving the oxidation efficiency of the vanadium slag roasting process. Background technique [0002] Vanadium slag is a vanadium-enriched material produced by blowing vanadium-containing molten iron in the presence of oxygen-containing gas. In the iron and steel industry, vanadium slag produced from vanadium-titanium magnetite is the main raw material for vanadium extraction. The composition of vanadium slag is related to the production method and the composition of vanadium-titanium magnetite. Generally speaking, vanadium slag is composed of V 2 o 5 , SiO 2 、Al 2 o 3 、Cr 2 o 3 、TiO 2 , MnO 2 The composition of vanadium slag varies greatly from factory to factory, but its phase structure is basically the same, all of which are composed of spinel, olivine, quartz and other phases. [0003] The traditional process of extra...

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): C22B1/02C22B7/04C22B34/22
CPCY02P10/20
Inventor 白瑞国李兰杰陈东辉
Owner HEBEI IRON AND STEEL