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Vanadium extraction method for vanadium-bearing steel slag

A technology of steel slag and additives, applied in the field of vanadium extraction from vanadium-containing steel slag, and low-temperature sodium roasting-pressurized acid leaching technology to extract vanadium from vanadium-containing steel slag, can solve the problem that it is difficult to adapt to the resource characteristics of vanadium-containing steel slag and the limitation of popularization and application. , immature process and other problems, to achieve obvious effect of emission reduction, energy saving, energy saving effect.

Inactive Publication Date: 2017-08-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many existing vanadium extraction processes, but it is difficult to adapt to the resource characteristics of vanadium-containing steel slag, and there are common deficiencies such as high cost, heavy pollution, and low recovery rate, so the popularization and application are limited
Although emerging vanadium extraction technologies such as microbial leaching and pulp electrolysis have the advantages of short process and low pollution, the process is still immature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mix the vanadium-containing steel slag and sodium carbonate according to the mass ratio of 100:15, and divide the mixed material into two groups A and B (200g each). % ratio to add 4g additives, additives by 70wt% CaF 2 and 30wt% Na 3 AlF 6 composition. A and B groups of samples were respectively placed in a tubular electric furnace for roasting, and the roasting conditions were as follows: roasting temperature 650°C, roasting time 80min. The two groups of calcine were leached with hot water respectively, and the content of vanadium in the filtrate was determined. The leaching rate of vanadium in the samples of group A was 50%, and the leaching rate of vanadium in the samples of group B was 63%.

[0021] The calcined sand obtained after roasting the samples of Group B was placed in a reactor for pressure acid leaching, and compared with hot water leaching. The pressure acid leaching conditions are: pressure 0.8MPa, leaching temperature 90°C, mass concentration of su...

Embodiment 2

[0023] The experimental equipment is the same as in Example 1.

[0024] Mix the vanadium-containing steel slag and sodium carbonate according to the mass ratio of 100:10, and divide the mixed material into two groups A and B (each 200g). % ratio to add 5g additives, additives by 40wt% CaF 2 and 60wt% Na 3 AlF 6 composition. Then it is roasted, the roasting temperature is 700°C, and the roasting time is 70min. The two groups of calcined sand were leached by hot water respectively, the leaching rate of vanadium in group A samples was 58%, and the leaching rate of vanadium in group B samples was 68%.

[0025] The calcined sand obtained from group B samples was subjected to pressure acid leaching and hot water leaching tests. The pressure acid leaching conditions are: pressure 1.0MPa, leaching temperature 110°C, sulfuric acid mass concentration 22%, leaching time 80min, liquid-solid ratio 1.5mL / g; hot water leaching conditions are the same as in Example 1. During pressure ac...

Embodiment 3

[0027] The experimental equipment is the same as in Example 1.

[0028] Mix the vanadium-containing steel slag and sodium carbonate according to the mass ratio of 100:12, take the mixed material and divide it into two groups A and B (200g each). % ratio to add 6g additives, additives by 70wt% CaF 2 and 30wt% MnO 2 composition. Then it is roasted, the roasting temperature is 800°C, and the roasting time is 60min. The two groups of calcine were leached by hot water respectively, the leaching rate of vanadium in group A samples was 64%, and the leaching rate of vanadium in group B samples was 71%.

[0029] The calcined sand obtained from group B samples was subjected to pressure acid leaching and hot water leaching tests. The pressure acid leaching conditions are: pressure 1.2MPa, leaching temperature 130°C, sulfuric acid mass concentration 23%, leaching time 70min, liquid-solid ratio 1.4mL / g; hot water leaching conditions are the same as in Example 1. During pressure acid l...

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PUM

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Abstract

The invention discloses a vanadium extraction method for vanadium-bearing steel slag. A low temperature sodium salt roasting-forcing acid leaching method is adopted for processing the vanadium-bearing steel slag. An assistant is added into the vanadium-bearing steel slag in the roasting process to achieve low temperature sodium salt roasting, a traditional hot water leaching manner is replaced with forcing acid leaching for a roasting product, and the vanadium extraction efficiency is improved. The vanadium extraction method has the beneficial effects that the energy consumption in the roasting process is low, the waste water discharge amount in the leaching process is small, and the vanadium recovering rate is high.

Description

technical field [0001] The invention relates to a method for extracting vanadium from vanadium-containing steel slag, in particular to a method for extracting vanadium from vanadium-containing steel slag by adopting low-temperature sodium roasting-pressurized acid leaching technology, and belongs to the technical field of resource utilization of industrial solid waste. Background technique [0002] The steelmaking process of vanadium-titanium magnetite will produce vanadium-containing steel slag with a vanadium grade as high as 4-12%, which is a typical vanadium-containing industrial solid waste. The occurrence state of vanadium in vanadium-containing steel slag is complex, dispersed in various mineral phases, and it is difficult to extract vanadium. At present, there are two main methods for extracting vanadium from vanadium-containing steel slag: one is to carry out pyrometallurgy on vanadium-containing steel slag, and then further extract vanadium after smelting high-vana...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B1/02C22B34/22
CPCC22B1/02C22B7/007C22B7/04C22B34/22
Inventor 刘树根杨希王群超王洁朱学哲杨怡萱
Owner KUNMING UNIV OF SCI & TECH
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