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Process for preparing calcium sulfate crystal whisker by desulfurized gypsum as well as calcium sulfate crystal whisker

A technology of calcium sulfate whisker and desulfurization gypsum, applied in the direction of calcium/strontium/barium sulfate, single crystal growth, crystal growth, etc. High cost, affecting the quality and application of whiskers, etc., to achieve high social value and significance, good crystallization, and high cost solutions

Inactive Publication Date: 2012-07-25
HENAN UNIV OF URBAN CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For patents CN 101994153 and CN 101311337A, the main goal is to study the integration of preparation and modification. The modified whiskers are mainly used in organic materials, but the prepared whiskers have a wide range of diameter distribution and aspect ratio. Difficult to control, the quality of the prepared whiskers is low, affecting the quality and application of the whiskers
For patent CN 101550602A, more than two kinds of organic and inorganic crystallization agents are used to prepare calcium sulfate whiskers, but the price of inorganic reagents is relatively high, resulting in high production costs for preparing calcium sulfate whiskers from desulfurized gypsum, and weak market competitiveness

Method used

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  • Process for preparing calcium sulfate crystal whisker by desulfurized gypsum as well as calcium sulfate crystal whisker
  • Process for preparing calcium sulfate crystal whisker by desulfurized gypsum as well as calcium sulfate crystal whisker
  • Process for preparing calcium sulfate crystal whisker by desulfurized gypsum as well as calcium sulfate crystal whisker

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Experimental program
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Embodiment 1

[0031] A kind of technique of preparing calcium sulfate whisker by desulfurization gypsum, its preparation technique comprises the steps:

[0032] Step 1, taking material: manual selection of desulfurized gypsum;

[0033] Step 2, ball milling: send the desulfurized gypsum selected in step 1 into a high-energy ball mill for ball milling, the medium of the ball mill is distilled water, control the mass ratio of desulfurized gypsum, balls, and water to 1:2:1, and the ball milling speed is 300r / min, Ball milling time 150min;

[0034] Step 3, preparing slurry: adjust the mass concentration of the slurry after ball milling in step 2 to 5% with water, adjust the pH value to 2, and then move it into the reaction kettle;

[0035] Step 4, add crystallization agent: directly add cupric chloride crystallization agent in the slurry in the reactor in step 3, the quality that adds is 1% of dry base desulfurization gypsum quality;

[0036] Step 5, hydrothermal reaction: heat the slurry in t...

Embodiment 2

[0049] A kind of technique of preparing calcium sulfate whisker by desulfurization gypsum, its preparation technique comprises the steps:

[0050]Step 1, taking material: manual selection of desulfurized gypsum;

[0051] Step 2, ball milling: send the desulfurized gypsum selected in step 1 into a high-energy ball mill for ball milling, the medium of the ball mill is distilled water, control the mass ratio of desulfurized gypsum, balls, and water to 1:2:1, and the ball milling speed is 200r / min, Ball milling time 300min;

[0052] Step 3, prepare slurry: adjust the mass concentration of the slurry after ball milling in step 2 to 3% with water, adjust the pH value to 3, and then move it into the reaction kettle;

[0053] Step 4, add crystallization agent: directly add cupric chloride crystallization agent in the slurry in the reactor in step 3, the quality that adds is 2% of dry base desulfurization gypsum quality;

[0054] Step 5, hydrothermal reaction: heat the slurry in the ...

Embodiment 3

[0067] A kind of technique of preparing calcium sulfate whisker by desulfurization gypsum, its preparation technique comprises the steps:

[0068] Step 1, taking material: manual selection of desulfurized gypsum;

[0069] Step 2, ball milling: Send the desulfurized gypsum selected in step 1 into a high-energy ball mill for ball milling, the medium of the ball mill is distilled water, control the mass ratio of desulfurized gypsum, balls, and water to 1:2:1, and the ball milling speed is 400r / min, Ball milling time 100min;

[0070] Step 3, prepare slurry: adjust the mass concentration of the slurry after ball milling in step 2 to 8% with water, adjust the pH value to 4, and then move it into the reaction kettle;

[0071] Step 4, add crystallization agent: directly add cupric chloride crystallization agent in the slurry in the reaction kettle in step 3, the quality that adds is 4% of dry base desulfurization gypsum quality;

[0072] Step 5, hydrothermal reaction: heat the slurr...

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Abstract

The invention discloses a process for preparing calcium sulfate crystal whisker by desulfurized gypsum as well as calcium sulfate crystal whisker, which can be used for solving the problems that the conventional process for preparing the calcium sulfate crystal whisker by the desulfurized gypsum has the defects of lower quality of the prepared calcium sulfate crystal whisker, higher used reagent price, and higher production cost. The process for preparing the calcium sulfate crystal whisker by the desulfurized gypsum is realized by the steps of material taking, ball-milling, slurry preparation, habit modifier feeding, hydrothermal reaction, dehydration and drying. The calcium sulfate crystal whisker prepared by the desulfurized gypsum has higher quality, has diameter of 1-3 mu m and has a length-diameter ratio of 100-150. Furthermore, the diameter distribution and the length-diameter variation of the calcium sulfate crystal whisker are smaller; and the calcium sulfate crystal whisker is crystallized well on the surface. The process provided by the invention has the advantages of simple process, and convenience in control. The used habit modifier is copper chloride and has lower cost, so that the production cost is effectively reduced and the process provided by the invention is good for development of enterprises. The conversion rate of the desulfurized gypsum reaches to be more than 80%. The prepared calcium sulfate crystal whisker has lower impurity content. The invention provides a novel route with high extra value, high technology and high quality utilization for the treatment of the desulfurized gypsum.

Description

technical field [0001] The invention relates to a preparation process of calcium sulfate whiskers, in particular to a process for preparing calcium sulfate whiskers from desulfurized gypsum which solves the problems of low quality of calcium sulfate whiskers, high price of reagents used, A process for preparing calcium sulfate whiskers from desulfurized gypsum and the calcium sulfate whiskers, which have the problem of high production costs. Background technique [0002] In recent years, due to the rising cost of high-quality natural gypsum mining, the cost of calcium sulfate whisker preparation has increased, while desulfurized gypsum has accumulated seriously, polluting the environment. With the strengthening of people's awareness of environmental protection, the use of desulfurized gypsum to prepare calcium sulfate whiskers has gradually attracted the attention of researchers. [0003] For the preparation of calcium sulfate whiskers by using desulfurized gypsum, in the p...

Claims

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Application Information

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IPC IPC(8): C30B29/62C30B7/10C01F11/46
Inventor 杨留栓汪潇杜玲枝王继娜徐开东
Owner HENAN UNIV OF URBAN CONSTR
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