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Method for preparing calcium sulfate whisker filler by using shale vanadium extraction and neutralization slag

A technology of calcium sulfate and shale, which is used in the field of preparing calcium sulfate crystal, can solve problems such as high cost of crystal stability, low calcium sulfate crystal, long production cycle, etc. The effect of shortening the production cycle and short production cycle

Inactive Publication Date: 2018-09-28
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In summary, the existing production cycle for preparing calcium sulfate whisker fillers is long, the process is complicated, and the yield of calcium sulfate whiskers is low
Whisker stabilization process is expensive and has limited effectiveness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing calcium sulfate whisker filler by extracting vanadium from shale and neutralizing slag. The steps of the method described in this embodiment are:

[0026] Step 1: Crushing and grinding the shale vanadium extraction neutralization slag until the particle size is less than 200 μm to obtain shale vanadium extraction neutralization slag powder.

[0027] Step 2, extracting vanadium and neutralizing slag powder from the shale according to the mass ratio of distilled water: crystal aid is 1: (30-50): (0.05-0.15), extracting vanadium and neutralizing the slag powder from the shale Add the distilled water and the crystal aid to the material, and mix to obtain a mixed slurry; then put the mixed slurry in a container, and perform a hydrothermal reaction under a saturated vapor pressure condition of 120-140°C for 1-4 hours, and then put The mixed slurry after the hydrothermal reaction is filtered while hot until the water content is less than 20 wt%, to obta...

Embodiment 2

[0033] A method for preparing calcium sulfate whisker filler by extracting vanadium from shale and neutralizing slag. The steps of the method described in this embodiment are:

[0034] Step 1: Crushing and grinding the shale vanadium extraction neutralization slag until the particle size is less than 200 μm to obtain shale vanadium extraction neutralization slag powder.

[0035] Step 2, extracting vanadium from shale and neutralizing slag powder according to the mass ratio of distilled water: crystal aid is 1: (20-40): (0.10-0.20), extracting vanadium from shale and neutralizing slag powder Add the distilled water and the crystal aid to the material, and mix to obtain a mixed slurry; then put the mixed slurry in a container, and conduct a hydrothermal reaction at 140-160°C for 3-6 hours under the condition of saturated vapor pressure, and then put The mixed slurry after the hydrothermal reaction is filtered while hot until the water content is less than 20 wt%, to obtain a fi...

Embodiment 3

[0041] A method for preparing calcium sulfate whisker filler by extracting vanadium from shale and neutralizing slag. The steps of the method described in this embodiment are:

[0042] Step 1: Crushing and grinding the shale vanadium extraction neutralization slag until the particle size is less than 200 μm to obtain shale vanadium extraction neutralization slag powder.

[0043] Step 2, extracting vanadium and neutralizing slag powder from the shale according to the mass ratio of distilled water: crystal aid is 1: (10-30): (0.20-0.30), extracting vanadium and neutralizing the slag powder from the shale Add the distilled water and the crystal aid to the material, and mix to obtain a mixed slurry; then put the mixed slurry in a container, and conduct a hydrothermal reaction at 160-180°C under a saturated vapor pressure condition for 5-8 hours, and then put The mixed slurry after the hydrothermal reaction is filtered while hot until the water content is less than 20 wt%, to obta...

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Abstract

The invention relates to a method for preparing a calcium sulfate whisker filler by using shale vanadium extraction and neutralization slag. The method comprises the following steps: smashing and pulverizing the shale vanadium extraction and neutralization slag to obtain shale vanadium extraction and neutralization slag powder; preparing and mixing the shale vanadium extraction and neutralizationslag powder, distilled water and a crystallizing aid according to a mass ratio of 1: (10 to 50): (0.05 to 0.3), putting the mixture into a container, performing hydrothermal reaction under an unsaturated vapor pressure condition at 120 to 180 DEG C, and filtering the solution to obtain a filter cake; under the condition of 50 to 100 DEG C, putting the filter cake into anhydrous ethanol, mixing thefilter cake with the anhydrous ethanol to obtain an anhydrous ethanol solution, wherein the content of the shale vanadium extraction and neutralization slag powder in the anhydrous ethanol solution is 5 to 15 weight percent; adding a modifier into the anhydrous ethanol solution, mixing and stirring the modifier and the anhydrous ethanol solution, filtering the solution while the solution is hot,and drying and depolymerizing the product, thus obtaining the calcium sulfate whisker filler. The method has the characteristics of simple process, short production period, high resource utilization rate and integration of preparation and modification; the prepared product has a large length-diameter ratio and a large activity index.

Description

technical field [0001] The invention belongs to the technical field of preparation of calcium sulfate whisker filler. Specifically, it relates to a method for preparing calcium sulfate whisker filler by extracting vanadium from shale and neutralizing slag. Background technique [0002] Calcium sulfate whisker is a fibrous single crystal made of gypsum as raw material through whisker treatment. Its uniform cross-section, complete shape and highly perfect internal structure make it have many advantages such as high temperature resistance, chemical corrosion resistance, excellent mechanical properties, etc. It is widely used in the plastic industry as a functional filler. [0003] The raw materials for preparing calcium sulfate whiskers are various materials containing gypsum, including natural gypsum ore, phosphogypsum, desulfurized gypsum, lemon gypsum, etc. Vanadium extraction neutralization slag from shale is the solid waste generated during the alkali neutralization proc...

Claims

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Application Information

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IPC IPC(8): C30B29/46C30B29/62C30B7/10
CPCC30B29/46C30B7/10C30B29/62
Inventor 刘涛向跟华张一敏黄晶
Owner WUHAN UNIV OF SCI & TECH
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