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Production method of citric acid gypsum

A technology of citric acid gypsum and production method, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of difficulty in removing citric acid, increase the difficulty of removing citric acid, etc., and achieve the effect of wide range of use

Active Publication Date: 2021-07-30
LAIWU TAIHE BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in order to increase the strength of the citrate gypsum produced so as to be more widely used, in the production process of citrate gypsum, calcium hydrogen citrate is generally added The intermittent acid hydrolysis with sulfuric acid was changed to continuous acid hydrolysis. Although the obtained citric acid gypsum has good structure and high strength, the citric acid mixed in the citric acid gypsum is difficult to be removed, which increases the difficulty of citric acid removal.

Method used

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  • Production method of citric acid gypsum
  • Production method of citric acid gypsum
  • Production method of citric acid gypsum

Examples

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Embodiment 1

[0039] A kind of citrate gypsum production method, comprises the following steps:

[0040] (1) Calcium hydrogen citrate and sulfuric acid are simultaneously passed into the reactor for continuous acidolysis, and the feeding speed of calcium hydrogen citrate is 40m 3 / h, the feed rate of sulfuric acid is 3.5m 3 / h, the reaction time is 5h, the reaction temperature is 88-89°C, and the citric acid gypsum raw material mixed with citric acid is prepared;

[0041] (2) Add the citric acid gypsum raw material obtained in step (1) into water to adjust the slurry, then add sulfuric acid to control the pH to 2.1, wherein the mass ratio of the citric acid gypsum raw material to water is 7:13, and filter to obtain thick citric acid gypsum;

[0042] (3) The crude citric acid gypsum obtained in step (2) is air-dried in an instant at 500°C; the feeding speed of the crude citric acid gypsum is 65m / s;

[0043] (4) Utilize the steam calcination machine to steam calcine for 40 minutes, and when...

Embodiment 2

[0045] A kind of citrate gypsum production method, comprises the following steps:

[0046] (1) Calcium hydrogen citrate and sulfuric acid are simultaneously passed into the reactor for continuous acidolysis, and the feeding speed of calcium hydrogen citrate is 40m 3 / h, the feed rate of sulfuric acid is 4m 3 / h, the reaction time is 6h, the reaction temperature is 88-89°C, and the citric acid gypsum raw material mixed with citric acid is prepared;

[0047] (2) adding the citric acid gypsum raw material obtained in step (1) into water to adjust slurry, then adding sulfuric acid, controlling the pH to be 2.3, wherein the mass ratio of citric acid gypsum raw material and water is 7:13, and filtering to obtain thick citric acid gypsum;

[0048] (3) The crude citric acid gypsum obtained in step (2) is air-dried instantaneously at 600°C; the feeding speed of the crude citric acid gypsum is 75m / s;

[0049] (4) Utilize the steam calcination machine to steam calcine for 50 minutes, a...

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Abstract

The invention discloses a production method of citric acid gypsum. The production method comprises the steps of (1) reacting calcium hydrogen citrate with sulfuric acid to prepare a citric acid-mixed citric acid gypsum raw material; (2) adding water into the citric acid gypsum raw material obtained in the step (1) for size mixing, then adding sulfuric acid, and controlling the PH to be 2.1-2.3, wherein the mass ratio of the citric acid gypsum raw material to the water is 7: 13, and crude citric acid gypsum is obtained through filtering; (3) carrying out instantaneous airflow drying on the crude citric acid gypsum obtained in the step (2) at the temperature of 500-600 DEG C; and (4) carrying out steam calcination for 40-50 minutes by using a steam calcining machine, and obtaining a citric acid gypsum finished product when the pH value of the material is 7. The obtained citric acid gypsum is high in structural strength, citric acid and crystal water mixed in the citric acid gypsum are removed to the maximum extent, and the residual amount of the citric acid is small.

Description

technical field [0001] The invention relates to the technical field of gypsum production, in particular to a production method of citric acid gypsum. Background technique [0002] Gypsum is an indispensable raw material in our daily life, especially in the construction industry, abrasive tool making, and industrial raw materials. Gypsum is mainly derived from natural gypsum---mined and processed from gypsum mines and industrial synthetic gypsum---mainly industrial by-products. [0003] As the country's environmental protection requirements become increasingly stringent, natural gypsum mines are increasingly closed, and industrial gypsum is increasingly on the agenda, which must be recycled. Industrial gypsum mainly comes from industrial by-products such as desulfurization gypsum, phosphogypsum, titanium gypsum, lactic acid gypsum and citrate gypsum, and the amount is extremely large. [0004] Through the research of relevant personnel in the past 60 to 70 years, great prog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46C04B11/032
CPCC01F11/46C04B11/032
Inventor 杜胜伟时振
Owner LAIWU TAIHE BIOCHEM
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