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Method for synchronously preparing silicon nitride and aluminum-iron-calcium-basedflocculating agent by utilizing fly ash and product thereof

A technology of fly ash and silicon nitride, which is applied in chemical instruments and methods, nitrogen compounds, flocculation/sedimentation water/sewage treatment, etc., can solve problems such as inability to prepare, and achieve the effect of simple preparation process

Active Publication Date: 2021-06-22
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of these three methods to prepare silicon nitride requires high-purity silicon powder, silicon dioxide or silica sol as silicon-based raw materials, and cannot be prepared from industrial solid wastes with relatively complex components.

Method used

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  • Method for synchronously preparing silicon nitride and aluminum-iron-calcium-basedflocculating agent by utilizing fly ash and product thereof
  • Method for synchronously preparing silicon nitride and aluminum-iron-calcium-basedflocculating agent by utilizing fly ash and product thereof
  • Method for synchronously preparing silicon nitride and aluminum-iron-calcium-basedflocculating agent by utilizing fly ash and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Effect of low-temperature plasma discharge time on the purity of the prepared aluminum nitride and the adsorption of aluminum-iron-calcium-based flocculants

[0026] Grind the fly ash for 2 hours to obtain a fine powder of fly ash. Low-temperature plasma discharge was performed on fly ash fine powder for 0.25h, 0.35h, 0.45h, 0.5h, 2.5h, 4.5h, 5h, 5.5h, and 6h to obtain nine groups of silicon-passivated fly ash, among which low-temperature plasma The bulk discharge power is 500kW, and the low-temperature plasma atmosphere is a mixed gas of nitrogen and methane, and the volume ratio of methane and nitrogen is 2.5:100. Mix water and hydrochloric acid to prepare 0.5M hydrochloric acid aqueous solution. According to the liquid-solid ratio of 0.5:1 (L / g), weigh hydrochloric acid aqueous solution and silicon passivated fly ash respectively, mix, stir for 0.5h, and filter to obtain nine groups of solid parts as silicon nitride mud, and nine groups of liquid parts It...

Embodiment 2

[0034] Example 2 Effect of low-temperature plasma discharge power on the purity of the prepared aluminum nitride and the adsorption of aluminum-iron-calcium-based flocculants

[0035]The fly ash was ground for 7 hours to obtain a fine powder of fly ash. Perform low-temperature plasma discharge on fly ash fine powder for 4.5 hours, wherein the low-temperature plasma discharge power is 250kW, 300kW, 400kW, 500kW, 2.75MW, 5MW, 5.2MW, 5.5MW, 6MW, and the low-temperature plasma action atmosphere is nitrogen Mixed gas with methane, the volume ratio of methane and nitrogen is 10:100, and nine groups of silicon-passivated fly ash are obtained. Mix water and hydrochloric acid to prepare a 1.5M aqueous hydrochloric acid solution. According to the liquid-solid ratio of 1.5:1 (mL / g), weigh hydrochloric acid aqueous solution and silicon-passivated fly ash respectively, mix, stir for 2 hours, and filter. The solid part obtained is silicon nitride mud, and there are nine groups in total. P...

Embodiment 3

[0040] Example 3 Effects of the volume ratio of methane and nitrogen on the purity of the prepared aluminum nitride and the adsorption of aluminum-iron-calcium-based flocculants

[0041] The fly ash was ground for 12 hours to obtain a fine powder of fly ash. Low-temperature plasma discharge was carried out on fly ash fine powder for 4.5 hours, wherein the low-temperature plasma discharge power was 5MW, and the low-temperature plasma atmosphere was a mixed gas of nitrogen and methane, and the volume ratios of methane and nitrogen were 1:100, 1.5:100, 2:100, 2.5:100, 10:100, 17.5:100, 18.5:100, 19.5:100, 20:100, nine groups of silicon-passivated fly ash were obtained. Mix water and hydrochloric acid to prepare 2.5M aqueous hydrochloric acid. According to the ratio of liquid to solid of 2.5:1 (mL / g), take hydrochloric acid aqueous solution and silicon passivation fly ash respectively, mix, stir for 3.5h, filter, the solid part obtained is silicon nitride mud, a total of nine gro...

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Abstract

The invention discloses a method for synchronously preparing silicon nitride and an aluminum-iron-calcium-based flocculating agent by utilizing fly ash and a product thereof, the preparation method comprises the following steps: using fly ash as a main raw material, adding hydrochloric acid and sodium hydroxide, and carrying out low-temperature plasma discharge treatment under the action atmosphere of methane and nitrogen, thereby synchronously obtaining the silicon nitride and aluminum-iron-calcium-based flocculating agent so that the preparation process is simple. The highest purity of the silicon nitride prepared by the method is 96%, and the prepared aluminum-iron-calcium-based flocculating agent can remove 93% of COD in the printing and dyeing waste liquid at most.

Description

technical field [0001] The invention relates to a method and a product for synchronously preparing silicon nitride and aluminum-iron-calcium-based flocculants by using fly ash, belonging to the field of fly ash resource utilization. Background technique [0002] The fine ash in the flue gas collected from the dust removal equipment in the process of using coal to generate electricity is fly ash. With the continuous increase of my country's electricity demand, the emission of fly ash is also increasing year by year, and it is expected to reach 925 million tons by 2024. Fly ash is easy to hydrate with calcium-based materials or other basic metal oxides to form materials with gelling properties. Therefore, the current recycling of fly ash is mainly reflected in the field of building materials. Although the utilization rate of fly ash in my country has increased, it still lags behind developed countries in terms of total utilization rate and utilization channels. At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C01B21/068C02F103/30
CPCC02F1/5236C01B21/068C02F2103/30Y02W30/91
Inventor 黄涛宋东平周璐璐张树文徐娇娇
Owner CHANGSHU INSTITUTE OF TECHNOLOGY