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Method for preparing nano cobalt tungstate and recovering crude titanium slag

A technology of nano-tungsten and coarse titanium, applied in chemical instruments and methods, nanotechnology, chemical recycling, etc., can solve the problems of low recovery rate of titanium elements, economic benefits, low-cost investment, and low value of recycled products, so as to achieve value enhancement, Improved economy and high recovery rate

Active Publication Date: 2021-06-11
华电光大(宜昌)环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, titanium is mostly recovered in the form of titanium dioxide. The recovery rate of titanium is often low, and the product purity is only about 90%, which cannot meet the purity standard for direct use. The value of recovered products is low, and the economic benefits are even lower than the cost input.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: A V 2 o 5 -WO 3 / TiO 2 A method for preparing nano-cobalt tungstate and reclaiming coarse titanium slag using waste SCR denitrification catalyst as raw material. The specific steps include:

[0034] (1) Pretreatment of waste catalyst

[0035] The waste catalyst was roasted at 550°C for 6 hours, and after soot blowing treatment, it was pulverized to below 300 mesh to obtain waste catalyst powder;

[0036] (2) Element separation

[0037] Uniformly mix the waste catalyst powder obtained after pretreatment with twice the mass of sodium chloride, and roast at 750°C for 6 hours; crush the sintered block obtained after roasting to 150 mesh, and use an ammonia solution with a volume concentration of 5% at a liquid-solid ratio 5:1 repeated leaching for 3 times, and then filtered to obtain sodium tungstate solution and titanium salt precipitation;

[0038] (3) Titanium recovery

[0039] Washing and drying the precipitate obtained in step (2) to obtain coarse tit...

Embodiment 2

[0045] Example 2: A V 2 o 5 -WO 3 / TiO 2 A method for preparing nano-cobalt tungstate and reclaiming coarse titanium slag using waste SCR denitrification catalyst as raw material. The specific steps include:

[0046] (1) Pretreatment of waste catalyst

[0047] The waste catalyst was calcined at 650°C for 4 hours, and after soot blowing treatment, it was pulverized to below 300 mesh to obtain waste catalyst powder;

[0048] (2) Element separation

[0049] Uniformly mix the waste catalyst powder obtained after pretreatment with 2.5 times the mass of sodium chloride, and roast at 800°C for 5 hours; crush the obtained agglomerate to 150 meshes, and use an ammonia solution with a volume concentration of 7% at a liquid-solid ratio 6:1 repeated leaching twice, and then filtered to obtain sodium tungstate solution and titanium salt precipitation;

[0050] (3) Titanium recovery

[0051] Washing and drying the precipitate obtained in step (2) to obtain coarse titanium slag, and c...

Embodiment 3

[0057] Example 3: A V 2 o 5 -WO 3 / TiO 2 A method for preparing nano-cobalt tungstate and reclaiming coarse titanium slag using waste SCR denitrification catalyst as raw material. The specific steps include:

[0058] (1) Pretreatment of waste catalyst

[0059] The waste catalyst was roasted at 750°C for 3 hours, and after soot blowing treatment, it was pulverized to below 300 mesh to obtain waste catalyst powder;

[0060] (2) Element separation

[0061] Uniformly mix the waste catalyst powder obtained after pretreatment with 3 times the mass of sodium chloride, and roast at 850°C for 3 hours; crush the sintered block obtained after roasting to 150 mesh, and use an ammonia solution with a volume concentration of 10% at a liquid-solid ratio 10:1 repeated leaching once, and then filtered to obtain sodium tungstate solution and titanium salt precipitation;

[0062] (3) Titanium recovery

[0063] Washing and drying the precipitate obtained in step (2) to obtain coarse titani...

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PUM

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Abstract

The invention relates to a method for preparing nano cobalt tungstate and recovering crude titanium slag, and belongs to the field of non-ferrous metal recovery. According to the recovery method, high-purity nanometer cobalt tungstate and high-quality coarse titanium slag are obtained through recovery through the steps of pretreatment, element separation, titanium element recycling, tungsten element purification, tungsten element recycling and the like, the recovery process is simple and easy to implement, the element recovery rate is high, the product can be directly applied industrially, and reasonable and efficient treatment of the waste SCR denitration catalyst is achieved.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal recycling, and in particular relates to a method for preparing nano-cobalt tungstate and recovering coarse titanium slag by using waste SCR denitrification catalysts as raw materials. Background technique [0002] The efficient and harmless treatment of solid waste has become a hot issue in the field of environmental protection in recent years. With the wide application of SCR denitrification catalysts, the output of waste SCR denitrification catalysts is also increasing year by year. According to statistics, there will be more than 820,000 tons of waste in 2025. The waste SCR denitrification catalyst needs to be disposed of. The potential harm of a large number of waste SCR denitrification catalysts to the environment has attracted widespread attention. The Ministry of Environmental Protection has named and specifically classified them, and formulated detailed laws and regulations on st...

Claims

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Application Information

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IPC IPC(8): C01G51/00C01G23/047C22B7/00C22B1/08C22B3/28C22B34/12C22B34/36B82Y40/00B82Y30/00
CPCC01G51/00C01G23/0475C01G51/003C22B7/009C22B7/002C22B1/08C22B7/008C22B34/1254C22B34/365B82Y30/00B82Y40/00C01P2006/80Y02P10/20Y02P20/584
Inventor 曲艳超陈晨任翠涛李盛学
Owner 华电光大(宜昌)环保技术有限公司
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