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Synthetic method of citric acid gypsum

A citrate gypsum and synthesis method technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of irregular crystal structure, coarse gypsum particles, and low strength of building gypsum powder, and achieve regular crystal structure, coarse particles, high value effect

Active Publication Date: 2019-09-27
JIANGSU EFFUL SCIENCE AND TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] This application provides a method for synthesizing citric acid gypsum. The raw material crystal structure of the synthesized citric acid gypsum is complete, and the gypsum particles are coarse, and the strength of the construction gypsum powder prepared by using the citrate gypsum synthesized by this method as a raw material can be greatly improved , so as to solve the problem of low strength of building gypsum powder prepared by citrate gypsum particles caused by fine particles and irregular crystal structure, thereby increasing the added value of citrate gypsum

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  • Synthetic method of citric acid gypsum

Examples

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Embodiment 1

[0037]Example 1: Mix calcium hydrogen citrate (a by-product of Jiangsu Guoxin Xielian Company) and water at a mass ratio of 1:2, the stirring speed is 300r / min, the temperature is 40°C, and dihydrate desulfurized gypsum seeds are added. The diameter is 30 μm, the mass ratio of desulfurized gypsum seed crystals to calcium hydrogen citrate is 1:2, prepare 1mol / L sulfuric acid solution and drop it in at a speed of 0.02mL / s. After the reaction is complete, continue to stir for 20 minutes, and then let it stand for 30 minutes. Finally, wash twice with ethanol and dry at 45°C. The median diameter of citrate gypsum particles prepared under this condition is 83 μm, and the crystal morphology is very regular, such as Figure 4-5 . Referring to the process for preparing building gypsum powder from citric acid gypsum in patent CN 102249577 A, the 2h flexural strength of the building gypsum powder prepared by using the citric acid gypsum raw material obtained in the present application i...

Embodiment 2

[0038] Example 2: Calcium hydrogen citrate (by-product of Shandong Taihe Biochemical Co., Ltd.) and water were mixed at a mass ratio of 1:6, the stirring speed was 100r / min, the temperature was 20°C, salt gypsum seeds were added, and the median diameter was 62μm, the mass ratio of salt gypsum seed crystals to calcium hydrogen citrate is 1:10, prepare a 0.1mol / L sulfuric acid solution and drop it in at a rate of 5mL / s, continue to stir for 5min after the reaction is complete, then let it stand for 90min, and finally use Wash twice and dry at 40°C. The median diameter of citrate gypsum particles prepared under this condition is 85 μm, and the crystal morphology is very regular, such as Figure 6-7 . Referring to the process for preparing building gypsum powder from citric acid gypsum in patent CN 102249577 A, the 2h flexural strength of the building gypsum powder prepared by using the citric acid gypsum raw material prepared in this application is 3.4MPa, and the 2h compressive...

Embodiment 3

[0039] Example 3: Mix calcium hydrogen citrate (by-product of Weifang Yingxuan Industrial Co., Ltd.) with water at a mass ratio of 1:12, the stirring speed is 500r / min, the temperature is 80°C, and lactic acid bacteria gypsum seeds are added. The median diameter is 80 μm, the mass ratio of salt gypsum seed crystals to calcium hydrogen citrate is 1:6, prepare 10mol / L sulfuric acid solution and drop it in at a speed of 0.008mL / s. Wash 3 times and dry at 50°C. The median diameter of citrate gypsum particles prepared under this condition is 102 μm, and the crystal morphology is very regular, such as Figure 8-9 . Referring to the process for preparing building gypsum powder from citric acid gypsum in patent CN 102249577 A, the 2h flexural strength of the building gypsum powder prepared by using the citric acid gypsum raw material prepared in this application is 3.2MPa, and the 2h compressive strength is 6.8MPa.

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Abstract

The invention belongs to the field of dihydrate gypsum synthesis and relates to a synthetic method of citric acid gypsum. The method comprises the following steps: preparing a suspension from calcium hydrogen citrate, calcium sulphate dihydrate seed crystal and water; heating the suspension until the temperature of the suspension is 20-80 DEG C, stirring the suspension and simultaneously adding a sulfuric acid solution into the suspension until sulfuric acid and calcium hydrogen citrate completely react; standing and taking a bottom solid after the reaction, cooling and washing and drying. By the technical scheme, the problem of low strength of building gypsum powder due to fine citric acid gypsum particles and irregular crystal structure is solved.

Description

technical field [0001] The application belongs to the field of dihydrate gypsum synthesis, and relates to a synthesis method of citric acid gypsum, in particular to a method for synthesizing high-quality citric acid gypsum from calcium hydrogen citrate discharged in the production process of citric acid. Background technique [0002] Citrate gypsum is a by-product mainly composed of calcium sulfate dihydrate discharged during the production of citric acid. At present, the by-products of citrate gypsum produced by domestic enterprises are small and irregular in crystal structure, and the median diameter of the particles is only 19 μm. Figure 1-2 As shown, the strength performance of the processed building gypsum powder is poor, and it cannot be used for high value-added applications. Existing patent all just introduced the technology of citric acid gypsum processing building gypsum powder, and the intensity of building gypsum powder is all not high. Patent CN102249577 A disc...

Claims

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Application Information

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IPC IPC(8): C01F11/46
CPCC01F11/46C01P2006/82C01P2004/61C01P2006/21C01P2004/03C01P2004/51
Inventor 孟醒唐永波万建东
Owner JIANGSU EFFUL SCIENCE AND TECHNOLOGY CO LTD
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