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A method for simultaneously preparing vanadium pentoxide and chemical grade manganese dioxide by using vanadium chromium 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 serious environmental pollution and high treatment costs, and achieve the effects of improving leaching rate, efficient separation, and solving high treatment costs

Active Publication Date: 2020-05-19
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for simultaneously preparing vanadium pentoxide and chemical grade manganese dioxide by using vanadium chromium slag and low-grade pyrolusite
  • A method for simultaneously preparing vanadium pentoxide and chemical grade manganese dioxide by using vanadium chromium 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 o 3MnO 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-chromiu...

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 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 water bath, adding deionized water, and add...

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 calculated molar ratio is 1:3; after that, it is roasted at 900°C for 180min 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 mat...

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Abstract

The invention relates to a method for simultaneously preparing vanadium pentoxide and chemical grade manganese dioxide from vanadium chromium slag and low-grade pyrolusite. The method is to mix the vanadium chromium slag and low-grade pyrolusite to obtain a mixed material, and then roast it in Leaching in acid solution and filtering to obtain vanadium-manganese-containing leachate and chromium-containing leach residue; adding ammonium salt to the vanadium-containing leachate and adjusting the pH value of the leachate to precipitate vanadium, filtering to obtain ammonium polyvanadate precipitate and manganese-containing supernatant. ; The vanadium pentoxide product is prepared by roasting and precipitating; the manganese-containing supernatant is added with an alkali metal hydroxide solution to generate manganese hydroxide, and an oxidizing agent is added to prepare manganese dioxide. After the waste liquid of vanadium and manganese precipitation is removed from impurities, it is circulated back to the leaching system as the leaching medium. The chromium-containing leaching residue is used as raw material for further extraction of chromium or preparation of ferrochromium alloy. The method of the present invention realizes the simultaneous extraction of vanadium and manganese from vanadium chromium slag and low-grade pyrolusite through one-step roasting and leaching, and the obtained vanadium pentoxide and chemical manganese dioxide have high purity. The vanadium extraction tailings can be further utilized as chromium-containing raw materials, and the vanadium extraction and manganese extraction waste liquid can be recycled back to the leaching process for use, effectively saving production costs.

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 Patents(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 LIAONING
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