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Method for comprehensively treating vanadium-containing slag and titanium white waste acid

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

Active Publication Date: 2021-05-25
攀枝花恒通钛业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Method for comprehensively treating vanadium-containing slag and titanium white waste acid

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Experimental program
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Effect test

Embodiment 1

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

[0037] (1) Crushing and grinding the vanadium-containing slag and passing it through a 120-mesh sieve, and magnetically separating 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 condition of stirring at 300r / min, and finish adding after about 5 minutes. The value is 3.3;

[0038] (2) Slowly add waste acid to the premixed liquid to adjust the pH to about 1.8, the reaction time is 45min, the reaction temperature is 50°C, and 47L of waste acid is consumed; after the reaction is completed, use a negative pressure centrifuge to separate the solid from the liquid to obtain 29.6kg tons Acidic high-sulfur off-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%, t...

Embodiment 2

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

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

[0050] (2) Slowly add waste acid to the premix to adjust the pH to about 1.7, the reaction time is 50 minutes, and the reaction temperature is 52°C; after the reaction is completed, use a negative pressure centrifuge to separate the solid from the liquid to obtain 31.58kg of water-containing acidic high-sulfur off-white gypsum Slag and 118L vanadium-containing solution; SO in gypsum slag 3 40%, Moisture 23%, V 2 ...

Embodiment 3

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

[0055] (1) After crushing and grinding the vanadium-containing slag, pass it through a 120-mesh sieve, and magnetically separate the bright iron to obtain slag powder; according to the liquid-solid ratio of 1:2.5, add 20kg of slag powder to 50L of dilute acid and stir Mixing at a speed of 300r / min. After the addition is complete, a premix solution is obtained with a temperature of 50°C and a pH value of 3.5;

[0056] (2) Slowly add waste acid to the premix to adjust the 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 water content Acidic high-sulfur gray-white gypsum slag and vanadium-containing solution; SO in gypsum slag 3 43%, Moisture 23%, V 2 o 5 The content i...

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Abstract

The invention discloses a method for comprehensively treating vanadium-containing slag and titanium white waste acid. The method comprises the following steps: 1) crushing and levigating the vanadium-containing slag, and mixing and stirring the treated vanadium-containing slag with dilute acid to form a premixed solution, wherein the dilute acid comes from acid-containing wastewater generated in each titanium dioxide preparation process of flue spraying in the process of preparing titanium dioxide via a sulfuric acid method; 2) mixing and stirring the premixed solution with the waste acid for a reaction to form slurry, and performing solid-liquid separation after the reaction is completed to obtain solid which is acidic high-sulfur off-white gypsum slag and to obtain liquid which is a vanadium-containing solution, wherein the waste acid comes from waste sulfuric acid which is difficult to recycle after acidolysis in the sulfuric-acid-method titanium dioxide production industry; and 3) adding iron powder into the obtained vanadium-containing solution, carrying out stirring reduction, then adding liquid caustic soda until the pH value of the reaction solution is 3.8-4.5, carrying out precipitation to obtain qualified slurry, and carrying out solid-liquid separation to obtain a vanadium-containing filter cake. According to the method provided by the invention, the vanadium-containing slag and the titanium dioxide waste acid can be effectively treated and comprehensively recycled, treatment cost can be reduced, and the method is used for industrial large-scale treatment.

Description

technical field [0001] The invention relates to the technical field of waste resource treatment, in particular to a method for comprehensively treating vanadium-containing slag and titanium white 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, Panzhihua, a region where sulfuric acid titanium dioxide is concentrated, needs to landfill tens of thousands of tons of red gypsum 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, of 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 gypsum slag with high sulfur content can be used in the cement industry: 1. Raw material...

Claims

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Application Information

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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