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Double-flow feeding method for vanadium slag pressure leaching reaction kettle

A technology of pressure leaching and reaction kettle, which is applied in the field of vanadium chemical industry and metallurgy, can solve the problems of high energy consumption and high roasting temperature, and achieve the effects of improving heat exchange efficiency, reducing preheating costs and prolonging the service life

Active Publication Date: 2022-04-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method does not use the sodium roasting process, but mixed roasting with calcium oxide, the roasting temperature is also high and the energy consumption is relatively high.

Method used

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  • Double-flow feeding method for vanadium slag pressure leaching reaction kettle
  • Double-flow feeding method for vanadium slag pressure leaching reaction kettle
  • Double-flow feeding method for vanadium slag pressure leaching reaction kettle

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Embodiment 1

[0056] This embodiment provides a method for dual-flow feeding of vanadium slag pressure leaching reactor, the process flow of the method is as follows figure 1 shown.

[0057] The method comprises the steps of:

[0058] Provide an initial temperature of 90°C and a concentration of 45wt% evaporated circulating NaOH solution, which is divided into A shares and B shares, wherein A shares are the first NaOH solution, and B shares are the second NaOH solution;

[0059] (1) The first NaOH solution is mixed with the vanadium slag that passes through a 200 mesh sieve and the proportion is 80wt%, to obtain a slurry with a liquid-solid ratio of 1.6:1;

[0060] (2) Preheating the second NaOH solution to 180° C. with a pipeline preheater, wherein the heating medium is saturated steam with a pressure of 3.0 MPa;

[0061] Then, the slurry obtained in step (1) is transported to the reactor by a diaphragm pump, and the preheated second NaOH solution is transported to the pressurized reacto...

Embodiment 2

[0063] This embodiment provides a method for dual-flow feeding of a vanadium slag pressure leaching reactor, the method comprising the following steps:

[0064] Provide the freshly prepared NaOH solution that initial temperature is 86 ℃, concentration is 48wt%, is divided into A share and B share, wherein, A share is the first NaOH solution, B share is the second NaOH solution;

[0065] (1) The first NaOH solution is mixed with the vanadium slag that passes through a 200 mesh sieve and the particle ratio is 84wt%, to obtain a slurry with a liquid-solid ratio of 2.0:1;

[0066] (2) Preheating the second NaOH solution to 210° C. with a pipeline preheater, wherein the heating medium is saturated steam with a pressure of 3.6 MPa;

[0067] Then, the slurry obtained in step (1) is transported to the reactor by a diaphragm pump, and the preheated second NaOH solution is transported to the pressurized reactor by a centrifugal pump whose impeller material is a Ni-Cr alloy. The additio...

Embodiment 3

[0069] This embodiment provides a method for dual-flow feeding of a vanadium slag pressure leaching reactor, the method comprising the following steps:

[0070] Provide an initial temperature of 80°C and a concentration of 50wt% evaporated circulating NaOH solution, which is divided into A shares and B shares, wherein A shares are the first NaOH solution, and B shares are the second NaOH solution;

[0071] (1) The first NaOH solution is mixed with the vanadium slag that passes through a 200 mesh sieve and the particle ratio is 86wt%, to obtain a slurry with a liquid-solid ratio of 1.8:1;

[0072] (2) Preheating the second NaOH solution to 220° C. with a pipeline preheater, wherein the heating medium is saturated steam with a pressure of 3.7 MPa;

[0073] Then, the slurry obtained in step (1) is transported to the reactor by a diaphragm pump, and the preheated second NaOH solution is transported to the pressurized reaction tank by a centrifugal pump whose impeller material is N...

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Abstract

The invention provides a vanadium slag pressure leaching reaction kettle double-flow feeding method which comprises the following steps: mixing first alkali liquor with vanadium slag to obtain slurry; the slurry obtained in the step (1) and preheated second alkali liquor are conveyed into a pressurized reaction kettle to be subjected to an oxidation leaching reaction, and vanadium extraction is achieved; according to the method, a double-flow feeding method is adopted for feeding a pressurized reaction kettle, so that not only is the loss of conveying equipment reduced, but also the leaching rate of vanadium is improved and reaches 90% or above, and the highest leaching rate can reach 97% or above; in addition, the second alkali liquor is preheated by adopting a pipeline preheating mode, so that the energy consumption in the heating process can be saved, and the service life of the equipment is also prolonged. The method disclosed by the invention is efficient and environment-friendly, is suitable for industrial production and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of vanadium chemical industry and metallurgy, and in particular relates to a double-flow feeding method for a vanadium slag pressure leaching reactor. 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. Enterprises that use vanadium-titanium magnetite as raw materials to produce iron and vanadium products currently use the traditional vanadium slag sodium roasting process to extract vanadium from vanadium slag, such as my country's Panzhihua Iron and Steel Corporation, Chenggang Iron and Steel Co., Ltd. in South Africa, and New Zealand Iron and Steel Co., Ltd. company etc. The basic principle of the sodium roasting process is based on Na 2 CO 3 As an addi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B7/04C22B3/02C22B3/12C22C19/05
CPCY02P10/20
Inventor 刘彪杜浩王少娜吕页清
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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