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Method for preparing ferric oxide red pigment by using nitryl chloride tail gas

A technology of nitroxyl chloride tail gas and iron oxide red, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., to achieve the effect of reducing environmental pollution, saving energy and reducing environmental pollution

Active Publication Date: 2011-09-14
海宁市黄湾镇资产经营有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to prevent or reduce the pollution to the environment in the process of industrial production from the source, and realize the goal of energy saving and emission reduction and sustainable development, the inventor has carried out research on the production of iron oxide red pigments by utilizing nitric acid chloride tail gas absorption liquid. This method has not yet been seen. to report

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  • Method for preparing ferric oxide red pigment by using nitryl chloride tail gas

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Embodiment 1

[0021] Add 240g of chemical iron sludge (from Zhejiang Changshan Changsheng Chemical Industry Co., Ltd.) into the water absorption tank of nitroxyl chloride, heat it with steam at 90-100°C, stir for 30 minutes to dissolve the iron sludge, and measure Fe in the solution. 3+ After the content reaches 110g / L, filter. The filtrate is transferred to the sedimentation tank, and an appropriate amount of ammonia water is added to control the pH value to 9, so that all the ferric iron is formed into ferric hydroxide to precipitate, and the solid and liquid are separated by a centrifugal separator, and the solid ferric hydroxide is put into a heating kiln for heating at 110°C In 10 minutes, the solid turned red and decomposed to obtain 311g of pure iron oxide red. The powder was determined to be pure phase α-Fe by XRD 2 o 3 , The conversion rate is 99%. Observation by transmission electron microscope, iron oxide red product is spindle-shaped. The measured technical indicators of the...

Embodiment 2

[0023] Add 255g of chemical iron sludge (from Zhejiang Changshan Changsheng Chemical) into the water absorption tank of nitroxyl chloride, heat it with steam at 90-100°C, stir for 60 minutes to dissolve the iron sludge, and measure Fe in the solution 3+ After the content reaches 130g / L, filter. The filtrate is transferred to the sedimentation tank, and an appropriate amount of ammonia water is added to control the pH value to 6, so that all the ferric iron is formed into ferric hydroxide and precipitated, and the solid and liquid are separated by a centrifugal separator, and the solid ferric hydroxide is put into a heating kiln for heating at 110°C In 10 minutes, the solid turned red and decomposed to obtain 366g of pure iron oxide red. The powder was determined to be pure phase α-Fe by XRD 2 o 3 , The conversion rate is 99%. Observation by transmission electron microscope, iron oxide red product is spindle-shaped. The measured technical indicators of the product meet the ...

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Abstract

The invention discloses a method for preparing ferric oxide red pigment by using nitryl chloride tail gas. The nitryl chloride tail gas is waste gas from the production process of high temperature chlorination of chloronitrobenzene. The method comprises the following steps of: adding chemical iron mud into a water absorption cell of the nitryl chloride tail gas; introducing steam to heat the water to 90 to 100 DEG C, stirring to dissolve the chemical iron mud; tracing and measuring the Fe3<+> content and the added quantity of the chemical iron mud in the solution; after the Fe3<+> content in the solution reaches 110 to 130g / L, filtering the solution, and adding ammonia water into the filtrate, adjusting the pH value to 6 to 9 and allowing trivalent iron to form iron hydroxide; precipitating; performing centrifugal separation on the precipitate; heating the solid to 105 to 115 DEG C; and decomposing the solid to obtain the ferric oxide red pigment, wherein the chemical iron mud is obtained after the nitro reduction reaction of iron powder. In the method, the harmful nitryl chloride tail gas and the solid waste iron mud obtained after nitro-reduction are used as raw materials to prepare the ferric oxide red pigment, so waste materials are changed into valuable materials, and the aims of sustainable development, energy conservation, consumption reduction and environmental pollution reduction are fulfilled.

Description

(1) Technical field [0001] The invention relates to a method for preparing iron oxide red pigment by utilizing nitroxyl chloride tail gas, which belongs to the comprehensive utilization technology of sustainable development. (2) Background technology [0002] Nitrochloride tail gas is the waste gas produced during the high-temperature chlorination production process of chloronitrobenzene. It is a harmful waste gas commonly discharged in the chlorination production industry of chlorinated nitrobenzene. It is urgently needed to be treated and recycled. Nitroxyl chloride chemical formula NO 2 Cl, molecular weight 81.46, light yellow gas, poisonous, corrosive, similar to chlorine gas. Density: gas 2.81 (100°C), liquid 1.33 (16°C). Melting point -145°C, boiling point -14.3°C. Above 100°C or decompose with water. Will explode violently on contact with organic substances. Chlorosulfonic acid can react with nitric acid, HOCl can react with nitrite, N 2 o 5 (g) Prepared by rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06
Inventor 裴文孙莉杨振平郭罕奇潘海燕郑洁胡建涛卞国清
Owner 海宁市黄湾镇资产经营有限公司
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