Method for producing white carbon black from waste denitration catalyst alkaline leaching desilicication residues

Abstract

The invention discloses a method for producing white carbon black from waste denitration catalyst alkaline leaching desiliconized residues, which comprises the following steps: S1, mixing the waste denitration catalyst alkaline leaching desiliconized residues with softened water in a ratio of 1:(3-5), and conducting heating to 60-80 DEG C to form silicon slag slurry; S2, adding a pH regulator into the silicon slag slurry to regulate the pH to 0.5-1.5 to obtain pH-regulated slurry; S3, filtering the pH-adjusted slurry to obtain a coarse silicic acid precipitate; S4, mixing the coarse silicic acid precipitate with a hydrochloric acid solution with the content of 3-5%, adding 0.1-0.5% of a dispersing agent, conducting stirring at normal temperature, conducting washing, conducting standing for 4-8 hours, and conducting filtering and separating by a centrifugal machine to obtain washed silicic acid; and S5, drying the washed silicic acid at 100 DEG C to obtain the high-quality white carbon black. The method for producing the white carbon black from the alkaline leaching desiliconized residues has the advantages of low energy consumption, less medicament consumption, low cost and simple process operation, can recycle and reduce hazardous wastes while improving economic benefits, and has good ecological and environment-friendly benefits.

Description

technical field [0001] The invention relates to the field of uniaxial compression tests of transparent rock mass, in particular to a method for producing white carbon black from waste denitrification catalyst alkali leaching desilicon slag. Background technique [0002] White carbon black is an older variety of silicon compounds, and its appearance is white highly dispersed amorphous powder or flocculent powder. It has a large internal surface area and a wide range of uses. It has a large dispersion force in raw rubber. It can be used as a reinforcing filler for rubber and plastics, a thickener or thickener, a paint blender, and a lightening agent. Casting release agent, etc. [0003] The production methods of white carbon black mainly include two types: precipitation method and gas phase method. The raw materials used in the precipitation method are cheap and easy to obtain, the production process and equipment are relatively simple, and the product price is low, which oc...

AI Technical Summary

Problems solved by technology

However, the above methods have problems such as medicament cost, water treatment cost, high energy consumption, cumbersome operation, and difficult wastewater treatment.

[0005] The waste denitrification catalyst contains 3%-6% silicon. In the process of resource utilization, tungsten and vanadium are usually extracted by adding alkali and roasting. The alkali leaching solution contains a relatively high concentration of silicon, and alkali leaching desiliconization slag is produced during the purification process. , and desiliconization slag contains impurity elements such as aluminum, titanium, sodium, magnesium, tungsten and trace heavy metals, which is a kind of hazardous waste. However, there is no good treatment method for desiliconization slag at present, and it will greatly affect the environment after being discarded.

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