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Method for synthesizing wollastonite with high length-diameter ratio by using industrial waste residue resource

An industrial waste residue, high aspect ratio technology, applied in the chemical industry, silicates, alkaline earth metal silicates, etc., can solve the problems of dust pollution, human and biological hazards, river silting, etc., and achieve a simple and reasonable process route. , The effect of high use value and excellent product performance

Inactive Publication Date: 2015-05-13
张延大
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a large amount of fly ash is not treated, it will become dust and pollute the atmosphere, and if it is discharged into the water system, the river will be silted up, and some of the chemical substances will also cause harm to the human body and organisms

Method used

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  • Method for synthesizing wollastonite with high length-diameter ratio by using industrial waste residue resource
  • Method for synthesizing wollastonite with high length-diameter ratio by using industrial waste residue resource
  • Method for synthesizing wollastonite with high length-diameter ratio by using industrial waste residue resource

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Experimental program
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Effect test

Embodiment 1

[0025] The method for synthesizing high aspect ratio wollastonite by utilizing industrial waste resources comprises the following five steps:

[0026] (1) Raw material preparation: Magnetic separation is used to remove iron from the raw material fly ash, and a dry iron powder recovery machine is used. It is characterized by multi-magnetic poles, high gradient with spiral structure, and multiple flips. The mass content of iron powder and iron elements in magnetically separated iron powder Up to 50-55%, Fe of fly ash after magnetic separation 2 o 3 The content is significantly reduced, reaching below 2%;

[0027] (2) Ingredients: According to the composition requirements of wollastonite, according to CaO / SiO 2 Molar ratio is equal to 1 and carries out raw material consumption calculation, gets raw material magnesium metal reduction slag and fly ash to be mixed into mixed material, and magnesium slag, fly ash carry out raw material preparation and mixing according to the follo...

Embodiment 2

[0047] The method for synthesizing high aspect ratio wollastonite by utilizing industrial waste resources comprises the following five steps:

[0048] (1) Raw material preparation: Magnetic separation is used to remove iron from the raw material fly ash, and a dry iron powder recovery machine is used. It is characterized by multi-magnetic poles, high gradient and spiral structure, and multiple flips. The content of iron elements in the magnetically separated iron powder reaches 55%, Fe of fly ash after magnetic separation 2 o 3 The content was significantly reduced, reaching 1.68%;

[0049] (2) Ingredients: According to the composition requirements of wollastonite, according to CaO / SiO 2 Molar ratio is equal to 1 and carries out raw material consumption calculation, gets raw material magnesium metal reduction slag and fly ash to be mixed into mixed material, and magnesium slag, fly ash carry out raw material preparation and mixing according to the following table 1 proporti...

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Abstract

The invention relates to a preparation method of wollastonite, and in particular relates to a method for synthesizing wollastonite with a high length-diameter ratio by using an industrial waste residue resource. The method comprises the steps of calculating the use level of a raw material according to a mole ratio of CaO to SiO2 of 1:1, and mixing raw materials magnesium reducing slag and fly ash to synthesize a mixed material; smelting the mixed material by adopting a three-phase alternating current melting method production process, wherein the furnace temperature is controlled to be 1550-1650 DEG C, and a corundum phase and a mullite phase with high content of Al2O3 are not melted due to relatively high melting points, and are deposited to the bottom of a molten pool because the densities of the corundum phase and the mullite phase are higher than that of a wollastonite melt, so that the corundum phase and the mullite phase and wollastonite crystals are separated out; performing steady crystallization and waste heat recovery, cutting peripheries of crystals after crystallization to obtain the remaining relatively pure wollastonite crystals, crushing the wollastonite crystals through a jaw crusher, and then smashing in a disc type airflow machine to ensure that the particle size reaches 1250 meshes. According to the preparation method, wastes are effectively used as raw materials, so that the magnesium reducing slag and fly ash is subjected to environment-friendly treatment, and the product obtained after the treatment is excellent in performance and high in use value.

Description

technical field [0001] The invention relates to a preparation method of wollastonite, which belongs to the technical field of comprehensive utilization of solid waste resources and new inorganic non-metallic materials. Background technique [0002] China's magnesium industry started in the 1980s and developed rapidly in the 1990s. At present, China has become a major producer of magnesium in the world. In 2006, the national magnesium output was 525,000 tons, accounting for about 70% of the global output. The Pidgeon process is the main method for producing magnesium metal. For every 1.01 t of magnesium metal produced, about 6.5-7.0 tons of magnesium metal smelting reduction slag (hereinafter referred to as magnesium slag) is produced, and the annual magnesium slag produced is 3-3.5 million tons. Magnesium slag is a waste material in the production enterprises of metal magnesium, and it is currently disposed of by dumping it on wasteland and filling mountain depressions. M...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/24
CPCY02P20/10Y02P20/129
Inventor 张延大
Owner 张延大