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Barium Sulfate Particles with Low α-Ray Dose, Utilization and Manufacturing Method

A manufacturing method, α-ray technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, applications, etc., can solve problems such as unknown high-efficiency manufacturing methods of barium sulfate

Active Publication Date: 2020-10-09
SAKAI CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in recent years, for the above-mentioned barium hydroxide and barium carbonate, in addition, for barium sulfate itself, further reduction of the α-ray dose has been required, but barium sulfate with a sufficiently low α-ray dose has not been known so far. A high-efficiency manufacturing method for low barium sulfate is also unknown

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0157] (method 1)

[0158] The amount of α-rays obtained by crushing the barite raw material ore A is 0.13cph / cm 2 1,500 g of crushed ore with an average particle diameter of 10.06 μm and a silica content of 0.70% by weight was added to prepare 12 L of slurry having a concentration of 125 g / L as barium sulfate.

[0159] To 30 L of pure water, 120 mL of 62.5% by weight sulfuric acid and 250 mL of 35% by weight hydrochloric acid were added, and further pure water was added to prepare a total of 60 L of elutriation water at pH 1.6.

[0160] The slurry was poured into a 13 L elutriation tank, and while the overflow from the elutriation tank was discarded, 60 L of the elutriation water was added from the lower part of the elutriation tank at a flow rate of 1 L / min for 1 hour. Thereafter, while discarding the overflow, an elutriation process in which 60 L of pure water was poured in at a flow rate of 1 L / min for 1 hour was continued, and the underflow was recovered as a slurry.

...

Embodiment 2

[0164] (method 1)

[0165] The amount of α-rays obtained by crushing the barite raw material ore B is 0.45cph / cm 2 1,500 g of crushed ore with an average particle diameter of 10.24 μm and a silica content of 0.90% by weight was added to prepare 12 L of slurry having a concentration of 125 g / L as barium sulfate.

[0166] The aqueous slurry of the crushed ore was subjected to elutriation treatment in the same manner as in Example 1, and an underflow was collected as a slurry. The above-recovered slurry was passed through a 400-mesh (38 μm mesh) sieve, and the slurry under the sieve was filtered, washed with water, and dried to obtain a first product with a silica content of 0.63% by weight.

[0167] Put the above first product and coke into a crucible, mix well, and then calcined in an electric furnace to obtain barium sulfide as the second product, which is leached in pure water to obtain an aqueous solution of barium sulfide. Next, to the barium sulfide aqueous solution obta...

Embodiment 3

[0169] (method 1)

[0170] The amount of α-rays obtained by crushing the barite raw material ore B is 0.45cph / cm 2 1,500 g of crushed ore with an average particle diameter of 10.24 μm and a silica content of 0.90% by weight was added to prepare 12 L of slurry having a concentration of 125 g / L as barium sulfate.

[0171] The aqueous slurry of the crushed ore was subjected to elutriation treatment in the same manner as in Example 1, and an underflow was collected as a slurry. The above-recovered slurry was passed through a 400-mesh (38 μm mesh) sieve, and the slurry under the sieve was filtered, washed with water, and dried to obtain a first product with a silica content of 0.63% by weight.

[0172] The obtained first product and coke were put into a crucible, mixed thoroughly, and calcined in an electric furnace to obtain barium sulfide as the second product, which was leached in pure water to obtain an aqueous solution of barium sulfide. Next, to the obtained barium sulfide aq...

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Abstract

According to the present invention, there is provided a method for producing barium sulfate particles with a low alpha radiation dose, characterized in that the crushed ore obtained by crushing the barite raw material ore is subjected to elutriation treatment as steps (1), (a); or ( b) performing sieving treatment; or (c) performing elutriation treatment and sieving treatment; according to the silica content of the crushed ore, reducing the silica content to a predetermined value to obtain a first product, and then, as a step (2), reducing the first product obtained by the above treatment with a reducing agent, leaching the barium sulfide obtained as the second product in water to obtain a barium sulfide aqueous solution, and then, as step (3), treating the above-mentioned barium sulfide The aqueous solution is subjected to chemical synthesis to obtain barium sulfate particles with low alpha radiation dose.

Description

technical field [0001] The present invention relates to barium sulfate particles with low alpha radiation dose and its production method. Specifically, the present invention relates to a silica content of 0.6% by weight or less and an α-ray dose of 0.07 cph / cm 2 The following low α-ray dose barium sulfate particles and their production method further relate to utilization of such low α-ray dose barium sulfate particles. Background technique [0002] With the miniaturization and high integration of electronic components in recent years, the problem of semi-permanent damage caused by erroneous operation of memory chips or the like in electronic equipment, or so-called soft errors, has become prominent. One of the causes of such soft errors is α-rays generated from α-ray sources such as U, Th, and Ra contained in inorganic materials in electronic components. For example, as electronic components are miniaturized and highly integrated, the underfill layer constituting the ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46C01C1/02C01C3/06C08K3/18C08K9/02C08L101/00
CPCC01C1/02C01C3/06C08K9/02C08L101/00C01F11/462C01P2006/80C01P2004/61C09C1/027C09C3/041C08K3/08C08K3/30C08K2003/3045C08K2003/0818Y02P10/20C08L23/00C09C3/06C09D11/20C01P2004/62C01P2006/44C01P2004/80C01P2006/12C08K2201/006G03F7/0043
Inventor 末田学绪方宏宣
Owner SAKAI CHEM IND CO LTD
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