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

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...

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