Method for simultaneously preparing vanadium pentoxide and chemical grade manganese dioxide by using chrome vanadium slag and low-grade pyrolusite

A technology of vanadium pentoxide and manganese dioxide, which is applied in the direction of improving process efficiency, can solve the problems of high processing cost and serious environmental pollution, and achieve improved leaching rate, high-efficiency separation, avoiding sodium roasting, water immersion and calcification The effect of roasting and acid leaching process

Active Publication Date: 2019-05-03
NORTHEASTERN UNIV
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Problems solved by technology

At the same time, low-grade pyrolusite resources with a manganese content of less than 30% have not been effectively utilized due to high processing costs or serious environmental pollution. How to utilize this part of low-grade manganese resources is an urgent problem to be solved at present.

Method used

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  • Method for simultaneously preparing vanadium pentoxide and chemical grade manganese dioxide by using chrome vanadium slag and low-grade pyrolusite
  • Method for simultaneously preparing vanadium pentoxide and chemical grade manganese dioxide by using chrome vanadium slag and low-grade pyrolusite

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Embodiment 1

[0034] A method for preparing vanadium pentoxide and chemical grade manganese dioxide by using vanadium chromium slag and low-grade pyrolusite, the process flow is as follows figure 1 shown, including the following steps:

[0035] (1) Take vanadium chromium slag (source is Panzhihua, Sichuan) and sieve after grinding to take 200-250 mesh particle size as raw material, wherein the vanadium content is calculated according to V 2 o 5 Calculated as 14.42%, chromium content by Cr 2 o 3 It is calculated as 9.45%, and the manganese content in low-grade pyrolusite (sourced from Kunming, Yunnan) is 30%. The two raw materials are in molar ratio, and the vanadium in the vanadium-chromium slag is V 2 o3 MnO in low-grade pyrolusite 2 The calculated molar ratio is 1:2 for mixing, and then roasting at 850°C for 120 minutes for manganization roasting, the heating rate is 2°C / min, and the crushed particle size of the roasted material is 250-300 mesh; the particle size of vanadium-chromium...

Embodiment 2

[0043] A method for preparing vanadium pentoxide and chemical grade manganese dioxide by using vanadium chromium slag preparation and low-grade pyrolusite, comprising the following steps:

[0044] (1) to press V 2 o 5 It is calculated as 13.35%, and the chromium content is calculated as Cr 2 o 3 The vanadium chromium slag (the source is Chengde, Hebei Province) of 8.77% is ground and sieved, and the particle size is 250-300 mesh, and the low-grade pyrolusite (the source is Kunming, Yunnan) with a manganese content of 18% is added for mixing. Roasting at 800°C for 180min for manganization roasting, the heating rate is 10°C / min, vanadium chromium slag, so as to manganize the vanadium in the vanadium slag. Among them, vanadium in vanadium-chromium slag is V 2 o 3 Calculated with manganese in pyrolusite as MnO 2 The calculated molar ratio is 1:1. After roasting, the crushed material has a particle size of 250-300 mesh.

[0045] (2) The leaching process is carried out in a ...

Embodiment 3

[0052] A method for preparing vanadium pentoxide and chemical grade manganese dioxide by using vanadium chromium slag preparation and low-grade pyrolusite, comprising the following steps:

[0053] (1) Press V 2 o 5 It is calculated as 15.48%, and the chromium content is calculated as Cr 2 o 3 Calculated as 6.55%, after grinding and sieving, take a particle size of 200-300 mesh and add low-grade pyrolusite (sourced from Xiangtan, Hunan) with a manganese content of 25% for mixing. The vanadium-chromium slag is mixed with V 2 o 3 MnO 2 The molar ratio is 1:3; after that, it is roasted at 900°C for 180 minutes for manganization roasting, and the heating rate is 5°C / min. Among them, the crushed particle size of the roasted material is 200-300 mesh;

[0054] (2) The leaching process is carried out in a heating mantle. The added water and the roasted material are based on a liquid-solid ratio of 20 mL / g. Deionized water is added to the leaching vessel, and the roasted material ...

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Abstract

The invention relates to a method for simultaneously preparing vanadium pentoxide and chemical grade manganese dioxide by using chrome vanadium slag and low-grade pyrolusite. The method comprises thesteps that a mixed material is obtained through the mixing of the chrome vanadium slag and the low-grade pyrolusite, the mixed material is leached in an acid solution after calcination, filtration isconducted,and a leaching solution containing vanadium manganese and leaching residue containing chrome are obtained; ammonium salt is added to the leaching solution containing vanadium, vanadium precipitating is conducted through adjusting the PH value of the leaching solution, filtration is conducted, and ammonium polyortho vanadate precipitation and liquid supernatant containing manganese are obtained; the precipitation is calcined, andvanadium pentoxide product is prepared; an alkali metal hydroxide solutionis added to the liquid supernatant containing the manganese, thus manganese hydroxide is obtained, then an oxidizing agent is added, thus the manganese dioxide is prepared,a vanadium and manganeseprecipitation waste solution circulates back to the leaching system after purification is conducted and serves as a leaching medium, and the leaching residue containing the chrome serves as the raw material for further extracting the chrome or preparing ferrochrome. According to the method for simultaneously preparing the vanadium pentoxide and the chemical grade manganese dioxide by using the chrome vanadium slag and the low-grade pyrolusite, simultaneous extracting of the vanadiumand the manganese in the chrome vanadium slag and the low-grade pyrolusite is achieved through one-step calcining-leaching, the purity of the obtained vanadium pentoxide and the chemical grade manganese dioxide is high, vanadiumextracting tailings can further serve as raw materials containing the chrome to be used, a vanadium and manganeseextracting waste solution can circulate back to the leaching process to be used, and the production cost is effectively saved.

Description

technical field [0001] The invention relates to a method for simultaneously preparing vanadium pentoxide and chemical-grade manganese dioxide by utilizing vanadium-chromium slag and low-grade pyrolusite, and belongs to the technical fields of vanadium chemical technology, manganese chemical technology and resource recycling. Background technique [0002] Vanadium is an important strategic resource in my country, and its compounds are widely used in many fields such as metallurgy and chemical industry. Low-chromium-type vanadium-titanium-magnetite blast furnace ironmaking-converter blowing vanadium-blown product low-chromium-type vanadium slag is currently the main raw material for vanadium extraction. However, the high-chromium vanadium-titanium magnetite with huge reserves has not been used in industrial production as a raw material for vanadium extraction. On the one hand, it is difficult to separate vanadium and chromium due to its complex mineral structure, and on the ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/06C22B3/08C22B3/10C22B3/44C22B34/22C22B47/00
CPCY02P10/20
Inventor 姜涛温婧曹婧陈泊键薛向欣
Owner NORTHEASTERN UNIV
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