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Preparation method and application of nano-iron particles

A technology of iron particles and nano-iron, which is applied in the field of preparation of nano-iron particles, can solve the problems of complicated process, high cost and unseen problems

Active Publication Date: 2015-08-19
SHANGHAI FUDA TONGNUO ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, chemical synthesis methods are costly and complex
At present, the production of mechanical grinding method is rarely seen in China, and no relevant reports have been seen.

Method used

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  • Preparation method and application of nano-iron particles
  • Preparation method and application of nano-iron particles
  • Preparation method and application of nano-iron particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] An imported high-precision grinding machine is used. The operating parameters are as follows:

[0088] ① 0.6 liter grinding volume,

[0089] ②Fill 80-85% of the balls,

[0090] ③20-50% iron particles (1-10 microns),

[0091] ④1.5-1.8kwh / L input power,

[0092] ⑤ Speed ​​2200-2400 RPM,

[0093] ⑥ Grinding temperature o C (the water in it plays a cooling role),

[0094] We tried grinders with a volume of 10, 25 and 60 liters with similar results. The grinding machines mentioned above can use different grinding balls, such as iron, steel, aluminum, zirconium (Zivconia), talc (Steatite), silicon nitride (Silicon Nitride), silicon carbide (Silicon Carbon) and tungsten carbide (Tungsten Carbon). We ended up using steel balls, which eliminates cross-contamination from other materials. The steel balls used as grinding balls belong to the same metal as the nano-iron produced in the end.

[0095] At the production base, according to the inventor's laboratory experience a...

Embodiment 2

[0097] Example 2: Fill the grinding machine with 85% grinding balls, the grinding balls are steel balls, the diameter of the grinding balls is 100 microns, and the raw material of iron particles of 1-10 microns, water and dispersant are in a weight ratio of 20:3:77 Mixing and adding in the grinder, the dispersant is polymethacrylic acid, which is mechanically extruded and mixed through a rotating shaft, and the grinding time is 5 hours. The obtained particles are sieved through a 200-nanometer filter membrane. Compliant with the nanometer level, it is returned to the production line with new raw materials for the second production grinding. That is to say, fine dispersed nano-iron particles that meet the requirements are obtained, and the unqualified particles continue to enter the grinding machine together with water and dispersant to repeat the above process. Among them: the input power of the grinding machine is 1.8kw.h / L, the grinding temperature is 20-55oC, and the rota...

Embodiment 3

[0098] Example 3: Using the nano-iron particles obtained in Example 1 for a copper company in a certain place to treat complex polymetallic wastewater projects

[0099] Project Overview

[0100] The waste water treated by this project-copper-precipitated liquid comes from the production waste water of the first workshop (precious metal workshop) of a certain factory. Treatment supernatant, power wave liquid, gold and silver waste water, excess silver reducing liquid and other streams of waste water. Wastewater characteristics:

[0101] (1) The sources of wastewater are complex, and the volume and quality of wastewater fluctuate greatly;

[0102] (2) The composition of wastewater is complex, containing a variety of complex heavy metals (arsenic, copper, cadmium, gold, silver, etc.);

[0103] (3) The content of chloride ion in wastewater is high (up to 60-150g / L), high in salinity (concentration is about 15%-25%), sulfite ion, COD, etc. are also relatively high.

[0104]...

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Abstract

The invention relates to a preparation method for nano-iron particles, which comprises the following steps: mixing iron particle raw materials of 1-10 microns with water and a dispersing agent; placing the mixture into a grinding mill; filling grinding balls into the grinding mill; performing the mechanical squeezing and mixing through a rotating shaft; grinding for 5-7 hours; screening obtained particles through a filtration film to obtain qualified dispersed fine nano-iron particles; screening unqualified particles; enabling screened particles to enter the grinding mill with water and the dispersing agent again for repeating the process, wherein the nano-iron particles with the total weight of 100% comprises the following components by weight percent: 20-50% of the iron particle raw materials of 1-10 microns, 1-10% of the dispersing agent, and the balance of water; the input power of the grinding mill is 1.5-1.8 kw. h / L, the grinding temperature is 20-55 DEG C, and the rotating speed of the rotating shaft is 2200-2400 RPM. According to the invention, the effluent water quality is excellent, stable and reliable, and the investment cost and running cost are lower; the nanometer water treatment technology and series products can effectively solve the problem that the heavy metal ion removing efficiency is influenced as inorganic ligands such as high chloride ions, high sulfate ions and high ammonia nitrogen in waste water and heavy metal ions can form dissolvable and stable complex compounds, and the wastewater treatment effect is not influenced at all.

Description

technical field [0001] The invention relates to a preparation method and application of nanometer iron (1-1000nm) particles. Background technique [0002] A nanometer is a unit of size equal to one billionth of a meter. For example, the diameter of a hair is about 100,000 nanometers (100 microns), and an ordinary bacterium (E 0 Coli) are about 1000 nm in diameter. [0003] Nanotechnology refers to the material synthesis, processing, and production and use of tiny devices at the nanometer level. Nanotechnology is not only the synthesis and production of small substances, but more importantly, the use of novel biological, physical, chemical and environmental characteristics. For example, carbon is a commonly used non-conductive substance, but carbon nanotubes (approximately 1.4 nanometers in diameter) are excellent conductors. Gold is an extremely stable inert metal, but nano-gold particles (<10 nm) are an extremely active catalyst for chemical reactions. [0004] As w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04C02F1/70C02F1/58C02F1/62
Inventor 袁立张伟贤
Owner SHANGHAI FUDA TONGNUO ENVIRONMENTAL TECH
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