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A method for comprehensively treating vanadium-containing slag and titanium dioxide waste acid

A technology of vanadium-containing slag and titanium dioxide waste acid, which is applied in the improvement of process efficiency and cement production, can solve the problems of high market share, high cost of purchasing raw materials, and high energy consumption in production, so as to reduce production and processing costs, reduce The effect of ecological pollution damage and waste water treatment cost reduction

Active Publication Date: 2022-07-19
攀枝花恒通钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] There are three main sources of production raw materials in the vanadium market. 1. The vanadium slag produced by steelmaking and vanadium blowing from large steel plants such as Panzhihua Iron and Steel and Chengde Iron and Steel has high content of characteristics, high market share, high degree of control of defective resources, and high cost of purchasing raw materials.
2. It comes from vanadium-containing coal gangue and vanadium soil. The characteristic resources are huge, but the content is low. Generally, the content of vanadium pentoxide is less than 1.7%. The production cost is high and the environmental pollution is great.
3. Part of the vanadium-containing slag with high calcium and high vanadium content in the vanadium extraction slag from the steel plant
[0005] In the prior art, it is publicly used to make balls and roast them, then acid leaching, and then use resin adsorption or extraction methods to extract vanadium, which will cause high production costs, high production energy consumption, and environmental pollution. Once the market vanadium Falling prices will make it difficult to continue production
This is also the reason why there is currently no actual case of any enterprise applying this type of technology to extract vanadium from high-calcium vanadium-containing slag acid leaching solution

Method used

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  • A method for comprehensively treating vanadium-containing slag and titanium dioxide waste acid

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Experimental program
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Effect test

Embodiment 1

[0036] A method for comprehensively processing vanadium-containing slag and titanium dioxide waste acid, comprising the following steps:

[0037] (1) After crushing and grinding the vanadium-containing slag, pass it through a 120-mesh screen, and magnetically select 6% bright iron. Weigh 20kg of slag powder for later use; inject 60L of dilute acid into the reaction tank, gradually add 20kg of slag powder under the stirring condition of 300r / min rotating speed, and finish adding after about 5 minutes, at this time, a premixed solution is obtained, and its temperature is 42 ° C, pH The value is 3.3;

[0038] (2) Slowly add waste acid to the premix to adjust the pH to about 1.8, the reaction time is 45min, the reaction temperature is 50°C, and the waste acid is consumed 47L; Acid high-sulfur gray-white gypsum slag and 100L vanadium-containing solution; gypsum slag SO 3 Greater than 35%, moisture 22%, V 2 O 5 The content is 0.20%, the dry weight is 23.2KG, and the vanadium lea...

Embodiment 2

[0048] A method for comprehensively processing vanadium-containing slag and titanium dioxide waste acid, comprising the following steps:

[0049] (1) After crushing and grinding the vanadium-containing slag, pass through a 120-mesh sieve, and magnetically select open iron to obtain slag powder; according to the ratio of liquid-solid ratio of 1:4, add 20kg of slag powder to 80L of dilute acid, and stir Mixing, the rotating speed is 200r / min, after the addition is completed, a premixed solution is obtained, the temperature of which is 45 °C, and the pH value is 2.8;

[0050] (2) Slowly add waste acid to the premix to adjust pH to about 1.7, the reaction time is 50min, and the reaction temperature is 52°C; after the reaction is completed, solid-liquid separation is carried out with a negative pressure centrifuge to obtain 31.58kg of water-acid high-sulfur gray-white gypsum Slag and 118L vanadium-containing solution; SO in gypsum slag 3 40%, moisture 23%, V 2 O 5 The content is...

Embodiment 3

[0054] A method for comprehensively processing vanadium-containing slag and titanium dioxide waste acid, comprising the following steps:

[0055] (1) After crushing and grinding the vanadium-containing slag, pass through a 120-mesh sieve, and magnetically select open iron to obtain slag powder; according to the ratio of liquid-solid ratio of 1:2.5, 20kg of slag powder is added to 50L of dilute acid, and stirred Mixing, the rotating speed is 300r / min, after the addition is completed, a premix is ​​obtained, the temperature of which is 50 °C, and the pH value is 3.5;

[0056] (2) Slowly add waste acid to the premix to adjust pH to 1.6, the reaction time is 60min, the reaction temperature is 55°C, and the waste acid consumption is 58L; after the reaction is completed, use a negative pressure centrifuge for solid-liquid separation to obtain 32.47KG of water Acid high-sulfur off-white gypsum slag and vanadium-containing solution; SO in gypsum slag 3 43%, moisture 23%, V 2 O 5 Th...

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Abstract

The invention discloses a method for comprehensively treating vanadium-containing slag and titanium dioxide waste acid. The flue in the white powder sprays the acid-containing wastewater produced in each titanium dioxide production process; 2) The premixed liquid and the waste acid are mixed and stirred to react to form a slurry. After the reaction is completed, the solid-liquid separation is completed, and the obtained solid is acidic high-sulfur gray-white Gypsum slag; the liquid is a vanadium-containing solution; the waste acid comes from the waste sulfuric acid that is difficult to reuse after acidolysis in the titanium dioxide industry by the sulfuric acid method; 3) Add iron powder to the obtained vanadium-containing solution for stirring and reduction, and then add liquid alkali to react The pH of the liquid is 3.8-4.5, and precipitation is performed to obtain a qualified slurry, and a vanadium-containing filter cake is obtained after solid-liquid separation. Through the method provided by the invention, vanadium-containing slag and titanium dioxide waste acid can be effectively treated, comprehensive recovery and utilization thereof can be realized, and the treatment cost can be reduced, so that the slag can be used for industrial-scale treatment.

Description

technical field [0001] The invention relates to the technical field of waste resource treatment, and more particularly, to a method for comprehensively treating vanadium-containing slag and titanium dioxide waste acid. Background technique [0002] At present, a large amount of solid waste red gypsum is produced due to the treatment of waste acid in the process of producing titanium dioxide by sulfuric acid method. For example, in Panzhihua, where titanium dioxide produced by sulfuric acid method is concentrated, tens of thousands of tons of red gypsum need to be landfilled every month, and the local solid waste treatment capacity has reached the red line. [0003] Gypsum slag is an indispensable auxiliary material in cement production, among which SO 2 The ingredients are used to balance the sulfur-alkali ratio in clinker calcination, improve the calcination operation and the service life of refractory materials, so the gypsum slag with high sulfur content can be used as: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B22/14C22B34/22C22B7/04C22B3/08C04B103/22
CPCC04B7/24C04B22/146C22B34/22C22B7/04C22B7/007C04B2103/22Y02P40/10
Inventor 高俊肖大才胥杰翰
Owner 攀枝花恒通钛业有限公司
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