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Technique for preparing wollastonite ultrafine powder from calcium silicate hydrate

A technology of hydrated calcium silicate and ultrafine powder, applied in the direction of silicate, alkaline earth metal silicate, etc., can solve the problems of high production cost and application fields, and achieve a wide range of uses, low energy consumption, and reduced processing costs. Effect

Active Publication Date: 2012-12-12
昊青薪材(北京)技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The products produced by these two processes have high purity, excellent performance and high added value, but the high production cost determines their limited application fields

Method used

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  • Technique for preparing wollastonite ultrafine powder from calcium silicate hydrate
  • Technique for preparing wollastonite ultrafine powder from calcium silicate hydrate
  • Technique for preparing wollastonite ultrafine powder from calcium silicate hydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The chemical composition analysis results of calcium silicate hydrate (CSH-1) are as follows:

[0031]

[0032] Accurately weigh 4.3g of sodium thiosulfate and 5.9g of oxalic acid, fully dissolve them in 1L of distilled water, and make impurity removal solution (CTY-1) for later use. Weigh 100g of calcium silicate hydrate (CSH-1) and add it to 500mL impurity removal solution (CTY-1) that has been heated to 80°C, and stir and react at this temperature for 60min; after the reaction, the slurry is filtered and washed to obtain 278g The impurity-removing filter cake of calcium silicate hydrate with a moisture content of 64%; the impurity-removing filter cake of calcium silicate hydrate was dried at 150° C. for 120 min in an electric blast drying oven to obtain 102 g of calcium silicate hydrate-removing powder; The impurity-removing powder of calcium silicate hydrate was put into an alumina crucible, calcined in a muffle furnace at 930°C for 60 minutes, and cooled to room...

Embodiment 2

[0034] The chemical composition analysis results of calcium silicate hydrate (CSH-2) are as follows:

[0035]

[0036] Accurately weigh 5.7g of sodium thiosulfate and 1.5g of oxalic acid, fully dissolve them in 1L of distilled water, and make impurity removal solution (CTY-2) for later use. Weigh 100g of calcium silicate hydrate (CSH-2) and add it to 700mL impurity removal solution (CTY-2) that has been heated to 60°C, and stir and react at this temperature for 90min; after the reaction, the slurry is filtered and washed to obtain 194g Hydrated calcium silicate impurity-removing filter cake with a moisture content of 50%; the hydrated calcium silicate impurity-removing filter cake was dried at 250° C. for 40 minutes in an electric blast high-temperature drying oven to obtain 98 g of hydrated calcium silicate impurity-removing powder; The impurity-removing powder of calcium silicate hydrate was put into an alumina crucible, calcined in a muffle furnace at 850°C for 120min, a...

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Abstract

The invention relates to a technique for preparing wollastonite ultrafine powder from calcium silicate hydrate. In the technique, dealkalied red mud-calcium silicate hydrate, which is generated in the technological process of treating aluminum-containing raw materials by an improved soda-lime sintering method, is used as the raw material. The technique comprises the following steps: putting calcium silicate hydrate into an impurity removal liquid prepared from sodium thiosulfate and oxalic acid, stirring to react at 50-90 DEG C for 40-120 minutes, and filtering the reaction slurry to obtain acalcium silicate hydrate impurity-removed filter cake; drying the calcium silicate hydrate impurity-removed filter cake at 110-400 DEG C for 30-120 minutes to obtain calcium silicate hydrate impurity-removed powder; and finally, calcining the calcium silicate hydrate impurity-removed powder at 850-950 DEG C for 30-120 minutes to obtain the product wollastonite ultrafine powder. The invention has the advantages of wide sources of raw material, low productive energy consumption, simple technological process, favorable product performance and high added value.

Description

technical field [0001] The invention belongs to the technical field of artificially synthesized wollastonite, and in particular relates to a method for preparing ultrafine wollastonite powder by using hydrated calcium silicate. Background technique [0002] Wollastonite is a calcium-containing metasilicate mineral powder material with the molecular formula CaSiO 3 . Wollastonite has low thermal expansion, good fluxing performance, good dielectric properties, and high whiteness. It is mainly used as ceramic raw materials, welding electrode flux, plastic and rubber reinforced materials, metallurgical mold slag, coating raw materials, and paper-making fillers. , Insulation materials, powder fire extinguishing agent, non-asbestos friction sheet, environmentally friendly adsorbent, adhesive, etc. [0003] According to JC / T 535-2007 "Wollastonite", wollastonite products are divided into 5 categories according to particle size: block, ordinary powder, fine powder, ultrafine powde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/24
Inventor 王晓艳彭辉马世林
Owner 昊青薪材(北京)技术有限公司
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