Production of non-metallic material calcium-sulfate whiskers

A technology of calcium sulfate whiskers and non-metallic materials, which is applied to the growth of polycrystalline materials, chemical instruments and methods, calcium/strontium/barium sulfate, etc., can solve the problems of complicated experimental steps, difficult industrialization and the like, and achieves low production costs. , The effect of solving pollution and short process flow

Inactive Publication Date: 2007-09-05
NORTHEASTERN UNIV
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Problems solved by technology

After cooling, white crystals are precipitated and observed under a microscope as sle

Method used

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  • Production of non-metallic material calcium-sulfate whiskers

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Embodiment 1

[0025] Selection: 40g of converter slag with a particle size of 0.074mm is used as raw material (the components of converter slag are shown in Table 1) and 240g of 10% sulfuric acid are reacted, the reaction temperature is 50°C, and the reaction time is 40min; after filtration and separation, the liquid phase is used to prepare ferric sulfate Mixture with magnesium sulfate, etc., the solid phase is calcium sulfate containing silicon dioxide; mix calcium sulfate with water at a ratio of 5:1 according to the solid-liquid ratio, adjust the pH value to 5 with calcium oxide; suspend the prepared calcium sulfate The liquid is put into the reaction kettle, under the condition that the temperature is 120°C, the pressure is 0.3MPa and the stirring speed is controlled at 50 rev / min, it is kept for 480min, filtered and washed; Under the condition of 120min, the holding time is 120min to obtain calcium sulfate whiskers; the calcium sulfate whiskers are surface-modified and dispersed by pol...

Embodiment 2

[0031] Selection: 40g of converter slag with a particle size of 0.09mm is used as raw material (the components of converter slag are shown in Table 2) and 160g of 15% sulfuric acid are reacted, the reaction temperature is 90°C, and the reaction time is 40min; after filtration and separation, the liquid phase is used to prepare iron oxide , the solid phase is calcium sulfate, the calcium sulfate is mixed with water at a ratio of 0.4 according to the solid-liquid ratio, and the pH value is adjusted to 6 with calcium oxide; the prepared calcium sulfate suspension is put into the reaction kettle, and the temperature is 150°C , under the condition that the pressure is 0.6MPa and the stirring speed is controlled as 100 rev / min, it is incubated for 240min, filtered and washed; the washed calcium sulfate whiskers are kept at a temperature of 100°C for 120min to obtain calcium sulfate Whiskers: use polyvinyl alcohol to modify and disperse the calcium sulfate whiskers on the surface, the...

Embodiment 3

[0037] Selection: use 40g of converter slag with a particle size of 0.074mm as raw material (the composition of converter slag is shown in Table 1) and react with 160g of 20% sulfuric acid, the reaction temperature is 70°C, and the reaction time is 40min; after filtration and separation, the liquid phase is used to prepare iron oxide , the solid phase is calcium sulfate, the calcium sulfate is mixed with water at a ratio of 0.6 according to the solid-liquid ratio, and the pH value is adjusted to 7 with calcium oxide; , under the condition that the pressure is 0.8MPa and the stirring speed is controlled as 200 rev / min, it is incubated for 300min, filtered and washed; the washed calcium sulfate whiskers are kept at a temperature of 140°C for 60min to obtain calcium sulfate Whiskers: use polyvinyl alcohol to modify and disperse the calcium sulfate whiskers on the surface, the dosage of the modifier is 0.5%, and finally obtain anhydrous calcium sulfate whiskers; the length of the w...

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Abstract

Production of non-metallic calcium sulfate whiskers is carried out by taking converter slag as raw materials, grinding, leaching out sulfuric acid, filtering to obtain calcium sulfate suspended solution, synthesizing by high-temperature crystallizing method, separating and drying to obtain the final product. The purity is above 98%. It's cheap, has better quality and short process flow path. It can be used as filler, friction material, building material or thermal-insulating material and used to substitute glass fiber.

Description

technical field [0001] The invention relates to comprehensive utilization of industrial waste, in particular to the technical field of non-metallic material processing, in particular to a method for preparing calcium sulfate whiskers by using converter slag. Background technique [0002] With the increase of steel production year by year, the solid waste is increasing year by year. Converter slag is one of them. The emission is generally 10% to 15% of crude steel production. Because the calcium content in converter slag is high, there is pulverization. Restricting its application, the current application range of converter slag is narrow, and they are all low value-added products. Today, with the increasing environmental awareness, strengthening the research on converter slag reuse technology has become a hot topic. [0003] At present, there are mainly several processing technologies for converter slag: recycling scrap iron and steel in converter slag; using converter slag ...

Claims

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Application Information

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IPC IPC(8): C30B29/10C30B29/62C30B7/10C01F11/46
Inventor 刘承军史培阳冯巍姜茂发
Owner NORTHEASTERN UNIV
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