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Industrial crude calcium sulfate purification and refining process

A calcium sulfate, industrial technology, applied in the field of industrial crude calcium sulfate purification and refining process, can solve the problems of high price of refined calcium sulfate, increased production cost, low purity of industrial calcium sulfate, etc., to achieve reduced production costs, high economic benefits and social benefits Benefits, the effect of low iron content

Inactive Publication Date: 2019-05-14
罗丽斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the current industrial calcium sulfate has a low purity and cannot meet the requirements of the drinking water industry, and the price of refined calcium sulfate on the market is too high, resulting in an increase in production costs. craft

Method used

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Experimental program
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Effect test

Embodiment 1

[0013] A kind of industrial crude calcium sulfate purification process, comprises the following steps:

[0014] (1) getting calcium sulfate content is the industrial thick calcium sulfate of 18%, is mixed with the thick calcium sulfate solution that massfraction is 10%, the vitriol oil that massfraction is 98% is mixed with the dilute sulfuric acid of 33%;

[0015] (2) Add the crude calcium sulfate solution and dilute sulfuric acid prepared in step (1) to the enamel reaction kettle, heat to 56°C, keep the temperature for 10 minutes, and then cool down to 20°C within 5 minutes;

[0016] (3) in the solution of step (2), add the calcium sulfate seed crystal of solution quality 2%, promptly have a large amount of calcium sulfate to separate out in the solution;

[0017] (4) Heating the solution containing crystals in step (3) to 42° C., keeping it warm for 5 hours, and then slowly cooling the solution to 25° C. to precipitate a large amount of crystals; repeat this process 4 times...

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Abstract

The invention discloses an industrial crude calcium sulfate purification and refining process, which includes the following steps: (1) preparing a crude calcium sulfate solution from industrial crudecalcium sulfate, and preparing 98% of concentrated sulfuric acid into 30-35% of dilute sulfuric acid; (2) adding the crude calcium sulfate solution and the dilute sulfuric acid into an enamel reactionkettle, heating to 50-60 DEG C, keeping the temperature for 10 minutes, and cooling to 20-25 DEG C; (3) adding calcium sulfate crystal seeds with 1-2% of the mass of the solution to precipitate calcium sulfate crystals; (4) heating the solution containing crystals to 40-45 DEG C, keeping the temperature for 5-6 hours, then cooling the solution to 20-25 DEG C, and precipitating a large amount of crystals; repeating this process 3-5 times to separate out crystals; (5) filtering the solution containing a large amount of crystals, and separating out the crystals to obtain the finished refined calcium sulfate. The refined calcium sulfate prepared by the method has low iron content, meets the drinking water industry standard, and has extremely high economic benefits and social benefits.

Description

technical field [0001] The invention relates to the technical field of refining industrial calcium sulfate, in particular to a process for refining industrial crude calcium sulfate. Background technique [0002] Calcium sulfate can be used as a precipitating agent for rosin glue, wax emulsion and other rubber materials in the paper industry, and can also be used as a flocculant in water treatment, and as an internal retention agent for foam fire extinguishers, raw materials for making alum and calcium white, petroleum decolorization, Deodorants, raw materials for some medicines, etc. It can also produce artificial gemstones and high-grade ammonium alum. [0003] Calcium sulfate also plays a big role in drinking water treatment. Adding calcium sulfate to drinking water can generate colloidal calcium hydroxide flakes that can absorb and precipitate bacteria, colloids and other suspended matter, and control drinking water. color and taste. Therefore, the drinking water indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46
Inventor 罗丽斌
Owner 罗丽斌
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