Method for extracting titanium slag, tungsten and vandic salt from waste SCR catalyst

A technology of SCR catalyst and titanium slag, which is applied in the field of extracting titanium slag from tungsten and vanadium salts, can solve the problems of raw material resource occupation, high equipment requirements, and environmental pollution, and achieve the goal of reducing environmental damage, low equipment requirements, and low investment requirements Effect

Active Publication Date: 2016-11-16
安徽思凯瑞环保科技有限公司
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Problems solved by technology

[0009] Because these methods need to be roasted at high temperature for many times to obtain high-purity products, they not only require high equipment, large investment, and high energy consumption, but also occupy the raw material resources of relevant downs

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  • Method for extracting titanium slag, tungsten and vandic salt from waste SCR catalyst

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Embodiment Construction

[0038] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings and specific embodiments of the present invention.

[0039] figure 1 It is the flow chart of the method for extracting titanium slag, tungsten and vanadium salt from waste SCR catalyst of the present invention. As shown in the figure, the method for extracting titanium slag, tungsten and vanadium salt from waste SCR catalyst of the present invention comprises:

[0040] 1) Pretreating the waste SCR catalyst to remove the adsorbed impurities;

[0041] 2) wet crushing the pretreated waste SCR catalyst into a slurry with a certain particle size, for example, a slurry with a particle size of 150-200 mesh;

[0042] 3) Add a sodium hydroxide solution with a mass percentage concentration of 20% to the slurry, and the mass ratio of the waste SCR catalyst to the sodium hydroxide solution is 5:1, and stir the reaction in a reaction kettle at a temperat...

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Abstract

The invention provides a method for extracting titanium slag, tungsten and a vandic salt from a waste SCR catalyst. The method comprises the steps that the waste SCR catalyst is preprocessed and crushed into slurry by use of a wet method; a sodium hydroxide solution is added into the slurry for reaction; coarse titanium slag power and compression filtrate are obtained by filter-pressing and separating the slurry by use of a plate-and-frame filter press; the coarse titanium slag power is placed into a sulfuric acid solution for cleaning, cleaned with clear water, and then filtered and separated for obtaining titanium slag powder containing titanium dioxide; and the compression filtrate is treated through a waste alkali nanofiltration recovery device, the compression filtrate containing sodium tungstate and sodium vanadate is added into a saturated calcium hydroxide solution for reaction, products from the reaction are subjected to filter pressing, and then calcium vanadate and calcium tungstate mixed solid bodies are obtained through filtering and separating.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method for extracting titanium slag, tungsten and vanadium salts from waste SCR catalysts. Background technique [0002] Selective catalytic reduction (SCR) technology is currently the most widely used and most efficient denitrification technology for removing nitrogen oxide pollutants in flue gas in thermal power plants and coal-fired boilers. More than 90% of the catalyst. This type of denitration catalyst uses heavy metals such as titanium dioxide (65-75%), vanadium pentoxide (1-2%), tungsten trioxide (3-6%) and other heavy metals as the skeleton and catalytic elements, which itself contains certain toxicity. During the use period, a large amount of heavy metals such as chromium, beryllium, arsenic and mercury in the flue gas caused secondary pollution to these catalysts and became harmful materials rich in various heavy metal components. [0003] In August 2014, th...

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Application Information

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IPC IPC(8): C22B7/00C22B34/12C22B34/22C22B34/36
CPCC22B7/008C22B7/009C22B34/1254C22B34/225C22B34/365Y02P10/20
Inventor 施文李彬彬骆秀宽
Owner 安徽思凯瑞环保科技有限公司
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