Low-cost method for preparing nano calcium sulfate

A nano-calcium sulfate, low-cost technology, applied in the directions of nanotechnology, nanotechnology, calcium/strontium/barium sulfate, etc., can solve the problems of unfavorable industrial production and high cost of nano-calcium sulfate, and achieve high commercial value and low cost. Effect

Active Publication Date: 2013-04-03
广东春天生态科技集团有限公司
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  • Application Information

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Problems solved by technology

[0004] However, the cost of nano calcium sulfate obtained by the above method i

Method used

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Examples

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Effect test

Embodiment 1

[0024] A low-cost method for preparing nano-calcium sulfate, which comprises the following preparation steps in sequence:

[0025] Step A: refining sulfate-containing brine and calcium-containing brine, then mixing the refined sulfate-containing brine and calcium-containing brine, and stirring to form a mixed solution;

[0026] Step B: After the mixed solution obtained in step A is left to stand, add the precipitate at the bottom to a centrifuge, remove the mother liquor, add water to stir and wash, and then dehydrate with a centrifuge to obtain wet calcium sulfate dihydrate;

[0027] Step C: drying the wet calcium sulfate dihydrate obtained in step B at 101 degrees Celsius;

[0028] Step D: Grinding the dried calcium sulfate in step C with a nanoscale dispersing grinder to obtain nanoscale calcium sulfate.

[0029] Specifically, in the step A, when mixing the sulfate-containing brine and the calcium-containing brine, it is divided into three steps successively:

[0030] Ste...

Embodiment 2

[0034] A low-cost method for preparing nano-calcium sulfate, which comprises the following preparation steps in sequence:

[0035] Step A: refining sulfate-containing brine and calcium-containing brine, then mixing the refined sulfate-containing brine and calcium-containing brine, and stirring to form a mixed solution;

[0036] Step B: After the mixed solution obtained in Step A is left to stand, add the precipitate at the bottom to a plate-and-frame filter press for pressure filtration, and flush water while pressing to remove soluble impurities such as sodium chloride to obtain wet dihydrate Calcium sulfate;

[0037] Step C: drying the wet calcium sulfate dihydrate obtained in step B at 150 degrees Celsius;

[0038] Step D: Grinding the anhydrous calcium sulfate dried in step C with a nanoscale dispersing grinder to obtain nanoscale calcium sulfate.

[0039] Specifically, in the step A, when mixing the sulfate-containing brine and the calcium-containing brine, it is divide...

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Abstract

The invention belongs to the technical field of preparation methods of calcium sulfate, and particularly relates to a low-cost method for preparing nano calcium sulfate. The method comprises the following steps: mixing byproducts sulfate-containing brine and calcium-salt-containing brine in salt preparation and other ocean chemical production processes to generate calcium sulfate from sulfate ions and calcium ions; and carrying out centrifugal dewatering on the calcium sulfate, drying and grinding to prepare the nano calcium sulfate. The invention fully utilizes the characteristic that the byproducts sulfate brine and calcium salt brine can be combined to generate calcium sulfate, changes wastes into valuable substances, can implement preparation of nano calcium sulfate at low cost, and has great commercial value.

Description

technical field [0001] The invention belongs to the technical field of calcium sulfate preparation methods, in particular to a method for preparing nanometer calcium sulfate at low cost. Background technique [0002] Nano-calcium sulfate has a wide range of uses, and can be used as food additives, industrial fillers, etc. At present, nano-calcium sulfate has not been widely used due to the preparation process, and people are still in the groping stage for the preparation of nano-calcium sulfate. [0003] For example, the Chinese invention patent with application number 201010146101.1 introduces a preparation process of nano-calcium sulfate, which uses lime and ammonium sulfate as raw materials. The reaction of the solution generates nano-calcium sulfate slurry, filtering, washing, drying and other processes. [0004] However, the cost of the nano-calcium sulfate obtained by the above method is very high, which is unfavorable for industrialized production. Contents of the ...

Claims

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Application Information

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IPC IPC(8): C01F11/46B82Y30/00
Inventor 林小明
Owner 广东春天生态科技集团有限公司
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