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

A barium sulfate, near-spherical technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, calcium/strontium/barium compounds, etc., can solve the problems of barium sulfate particle shape irregularity, wide particle size distribution, etc. , to achieve the effect of improving Tg value and flame retardant performance, improving whiteness and high thermal conductivity

Active Publication Date: 2009-07-08
GUIZHOU REDSTAR DEVING
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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 produ

Method used

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

Examples

Experimental program
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[0022] Example 1

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

[0024] (b) Put the above crude barium sulfide into the leaching tank and soak it with 80°C hot water to prepare a solution containing 114g / L barium sulfide, and adjust the temperature to 67°C. The barium sulfide solution and excess sulfuric acid (industrial sulfuric acid, 98%) was added into the continuous reactor at the same time to react to produce barium sulfate slurry and hydrogen sulfide. The addition rate of barium sulfide solution was 4000L / h. The amount of sulfuric acid added was 2.7g / L according to the remaining sulfuric acid concentration in the barium sulfate slurry after the reaction was completed. Calculation

[0025] (c) Pass hot air into the barium sulfate slurry to discharge hydrogen sulfide, and th...

Example Embodiment

[0028] Example 2

[0029] (a) Crush and mix barite and anthracite, put them into a calcining converter for calcination, the temperature is controlled at 1200°C, and the calcination time is 2 hours to produce 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 with hot water at 80°C to prepare a solution containing 110g / L barium sulfide, and adjust the temperature to 65°C. The barium sulfide solution and excess sulfuric acid (industrial sulfuric acid, 98%) was added into the continuous reactor at the same time to react to produce barium sulfate slurry and hydrogen sulfide. The addition rate of barium sulfide solution was 3000L / h, and the amount of sulfuric acid added was 12.5g / L according to the concentration of remaining sulfuric acid in the barium sulfate slurry after the reaction was completed. Calculation

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

Example Embodiment

[0034] Example 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 a barium sulfate slurry, and the 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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IPC IPC(8): C01F11/46
CPCC01P2004/32C01P2004/51C01F11/462
Inventor 华东刘正涛
Owner GUIZHOU REDSTAR DEVING
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