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Preparation of subsphaeroidal barium sulfate by sulfuric acid process and use in copper foil substrate

A barium sulfate, nearly spherical technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, calcium/strontium/barium compounds, etc., can solve problems such as wide particle size distribution and irregular shape of barium sulfate particles , to achieve a wide range of applications, improve the Tg value and flame retardant performance, high thermal conductivity effect

Active Publication Date: 2012-02-29
GUIZHOU REDSTAR DEVING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the present invention is to provide a kind of sulfuric acid method barium sulfate preparation method that produces nearly spherical barium sulfate, to solve the problem that barium sulfate particle shape is irregular, particle size distribution is wide

Method used

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  • Preparation of subsphaeroidal barium sulfate by sulfuric acid process and use in copper foil substrate
  • Preparation of subsphaeroidal barium sulfate by sulfuric acid process and use in copper foil substrate

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (a) Grinding and mixing barite and anthracite, putting them into a calcining converter for calcination, the temperature is controlled at 1200° C., and the calcination time is 2 hours to generate crude barium sulfide containing about 60% of barium sulfide;

[0024] (b) Put the above-mentioned crude barium sulfide into the leaching tank and soak it in hot water at 80°C to prepare a solution containing 114g / L barium sulfide, and adjust the temperature to 67°C, mix the barium sulfide solution with excess sulfuric acid (industrial sulfuric acid, 98%) is added in the continuous reactor simultaneously and reacts to generate barium sulfate slurry and hydrogen sulfide, and the adding rate of barium sulfide solution is 4000L / h, and the concentration of sulfuric acid add-on is 2.7g / L according to the concentration of residual sulfuric acid in the barium sulfate slurry after the completion of the reaction calculate;

[0025] (c) Pass hot air into the barium sulfate slurry to disch...

Embodiment 2

[0029] (a) Grinding and mixing barite and anthracite, putting them into a calcining converter for calcination, the temperature is controlled at 1200° C., and the calcination time is 2 hours to generate crude barium sulfide containing about 60% of barium sulfide;

[0030] (b) Put the above-mentioned crude barium sulfide into the leaching tank and soak it in hot water at 80°C to prepare a solution containing 110g / L barium sulfide, and adjust the temperature to 65°C, mix the barium sulfide solution with excess sulfuric acid (industrial sulfuric acid, 98%) is added in the continuous reactor simultaneously and reacts to generate barium sulfate slurry and hydrogen sulfide, and the adding rate of barium sulfide solution is 3000L / h, and the add-on of sulfuric acid is 12.5g / L according to the concentration of residual sulfuric acid in the barium sulfate slurry after the completion of the reaction calculate;

[0031] (c) Pass hot air into the barium sulfate slurry to discharge hydrogen...

Embodiment 3

[0035] The remaining steps are the same as in Example 2, except that in step (d), after dehydration and washing, the filter cake is dissolved in water to make barium sulfate slurry, and coupling agent KH-560 is added to the barium sulfate slurry.

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Abstract

The invention discloses a method for preparing subsphaeroidal barium sulfate by a sulfuric acid process, which aims to solve the problems that barium sulfate particles have unshaped morphology and wide particle size distribution. The method comprises the following concrete steps that: (a) coal is used to calcine barite to generate barium sulfate; (b) water is used to dissolve the barium sulfate to be prepared into 70 to 130g / L barium sulfate solution, the temperature is adjusted to be between 45 and 85 DEG C, the barium sulfate solution and excessive sulfuric acid are synchronously added into a continuous reactor to react to generate barium sulfate slurry and hydrogen sulfide, and the adding rate of the barium sulfate solution is between 500 and 7,000L / h; (c) hot air is introduced into the barium sulfate slurry to discharge the hydrogen sulfide; and (d) the barium sulfate slurry is dehydrated, washed, dried and crushed to obtain a finished product of the subsphaeroidal barium sulfate. The barium sulfate which is spheroidal or subsphaeroidal and has continuously adjusted particle size distribution can be obtained by the preparation method. At the same time, the invention also discloses application of the subsphaeroidal barium sulfate used as a packing material to copper foil substrates.

Description

technical field [0001] The present invention relates to a kind of barium sulfate, specifically, relate to the method for preparing barium sulfate by sulfuric acid method. Background technique [0002] Ordinary barium sulfate is widely used in many industries such as rubber, plastics, ink, paint, paper and so on. Nano-barium sulfate has important structural properties such as quantum effect, size effect, and surface effect. Its physical properties are different from ordinary materials. It is a new type of high-grade functional filling material. The field has broad application prospects. Moreover, it has broad application prospects in medicine, ceramics, composite materials and the like. [0003] In the prior art, the production technology of barium sulfate is generally divided into several main types such as natural ore processing and milling, Glauber's salt chemical synthesis and sulfuric acid synthesis. The particle size of natural ore pulverization is coarse, and the pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46
CPCC01P2004/32C01P2004/51C01F11/462
Inventor 华东刘正涛
Owner GUIZHOU REDSTAR DEVING
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