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A method for producing high-activity iron powder by utilizing industrial waste iron slime

A kind of scrap iron sludge, high activity technology, applied in the direction of recycling technology, reducing gas emissions, etc., can solve the problems of complex process, long production cycle, complex process, etc., to achieve simple process, good product performance, easy to store and use. Effect

Active Publication Date: 2017-09-19
CHIA TAI ENERGY MATERIALS DALIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic researchers have studied the iron-based products produced by iron mud, including α-FeOOH, ferric ammonium citrate, ferrous sulfate, iron oxide red, iron oxide black, etc., but these processes have the disadvantages of complicated process and long production cycle
Patent CN1312334A discloses a method for preparing iron oxide red by catalyzing high-temperature calcination with concentrated sulfuric acid, but this technology is limited due to secondary pollution
Zhang Liqing and others prepared α-FeOOH by using industrial waste iron sludge, but the process is more complicated

Method used

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  • A method for producing high-activity iron powder by utilizing industrial waste iron slime

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Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: get the iron mud of a certain amount of m-nitrobenzenesulfonic acid reduction process [document 1: Li Liang, Liang Qiuxia, Liu Wei, etc., the synthetic method and industrial production process of m-nitrobenzenesulfonic acid, fine chemical intermediate , 2010, 40(3):8-11], washed with water until the pH value of the filtrate was 7, and then dried the solid matter at 100°C for 12 hours. Take 20g of dry iron sludge and 1g of silicon dioxide, mix them evenly and put them into the reduction reactor, feed hydrogen gas at a flow rate of 20mL / min, and raise the temperature from room temperature to 800°C at a constant speed in 1 hour to carry out the reduction reaction for 2 hours. Then cool to 150°C in nitrogen and discharge the material to obtain reduced iron powder Fe-800-2. The obtained product is used for the reduction of m-nitrobenzenesulfonic acid to prepare m-aminobenzenesulfonic acid. The conversion rate and selectivity of the reaction are shown in the tabl...

Embodiment 2

[0021] Example 2: Take a certain amount of iron sludge from the DSD acid production process [Document 2: Wang Fu, Yu Guixiang, Wang Guisheng, Research on a New Method for DSD Acid Preparation, Liaoning Chemical Industry, 1994, 5: 33-35], wash with water until the filtrate The pH was 8, and the solid material was dried at 140°C for 8 hours. Take 20g of dry iron sludge and 0.5g of aluminum oxide, mix them uniformly and put them into the reduction reactor, pass in hydrogen gas with a flow rate of 40mL / min, and raise the temperature from room temperature to 800°C at a constant speed in 60 minutes to carry out the reduction reaction for 3 hours. Then cool to room temperature in nitrogen and discharge the material to obtain reduced iron powder Fe-800-3. The obtained product is used for the reduction of m-nitrobenzenesulfonic acid to prepare m-aminobenzenesulfonic acid. The conversion rate and selectivity of the reaction are shown in Table 1. .

Embodiment 3

[0022] Example 3: Take a certain amount of iron sludge from the production process of p-aminophenol [Document 3: Zhang Yanzhong, Review of p-aminophenol Synthesis Technology, Guangxi Chemical Industry, 1997, 26 (2): 14-19], wash with water until the pH of the filtrate is 8, and then the solid matter was dried at 140°C for 8 hours. Take 20g of dried iron sludge, 0.4g of silicon dioxide and 1.2g of alumina into a reduction reactor, feed hydrogen gas at a flow rate of 40mL / min, and raise the temperature from room temperature to 750°C at a constant rate in 1 hour for reduction reaction for 3 hours. Then cool to 200°C in nitrogen and discharge the material to obtain reduced iron powder Fe-750-3. The obtained product is used for the reduction of m-nitrobenzenesulfonic acid to prepare m-aminobenzenesulfonic acid. The conversion rate and selectivity of the reaction are shown in the table 1.

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Abstract

The invention discloses a method for producing high-activity iron powder through waste industrial iron cement. The method comprises the steps of washing and drying waste industrial iron cement; mixing with a certain quantity of modifiers; reducing for a certain time through reducing gas; cooling through inert gas to obtain the high-activity iron powder. The high-activity iron powder can be used as a reducing agent to be applied to the field of fine chemical synthesis. According to the method, the simple process is adopted to achieve the utilization of the waste industrial iron cement; the process is green and environmentally friendly; in addition, the consumption of first resources in production of high-activity reducing iron powder can be saved, and thus the social and economic values are certainly increased.

Description

technical field [0001] The invention relates to a method for producing high-activity iron powder by one-step reduction, in particular to a method for producing high-activity iron powder by recycling waste iron sludge in the fine chemical industry. Background technique [0002] Environmental problems are a common concern in the world today, and the pollution in the chemical industry is particularly serious. In order to protect the ecological environment, we must actively prevent and control environmental pollution. In addition, in today's situation where primary resources are increasingly scarce, it is particularly important to rationally recycle available resources and turn waste into treasure, which can generate huge economic and social benefits. [0003] Iron powder reduction is a traditional production process in organic synthesis. This method has the characteristics of simple production process, low equipment requirements, less side reactions and wide application range. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22C21B3/04
CPCY02P10/143Y02W30/50
Inventor 吴宗斌程鸿魁徐敏王莹刘翔
Owner CHIA TAI ENERGY MATERIALS DALIAN
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