Method for synthesizing high-purity calamine via hydrothermal process

A technology of hemimorphite and hydrothermal method, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of low purity of hemimorphite zinc silicate, low purity, difficult separation and extraction, etc., to achieve convenient Large-scale production, mild reaction conditions, simple reaction effect

Inactive Publication Date: 2021-12-21
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the purity of hemimorphite zinc silicate in nature is low, and it is difficult to sort and extract. The existing synthesis technology has complex reactions, strict requirements on the amount control of reactants, and low purity, which is difficult to meet the requirements of related scientific and technological fields.

Method used

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  • Method for synthesizing high-purity calamine via hydrothermal process
  • Method for synthesizing high-purity calamine via hydrothermal process
  • Method for synthesizing high-purity calamine via hydrothermal process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 50g of zinc metasilicate according to the liquid-solid ratio of 12mL / g, put it into a 1L reactor, add 600mL of distilled water into the reactor, seal the reactor, feed industrial oxygen, at a constant speed of 600rpm and a constant pressure of 1.0MPa, respectively The set temperature is 140-220°C. When the temperature rises to the set temperature, the timing starts. At this temperature, the hydrothermal reaction is carried out for 3 hours; after cooling down to 70°C through the water cooling tube, the liquid-solid separation of the obtained substance is carried out, and then the liquid is separated at 65°C. Dry under conditioned conditions for 10 hours.

[0027] figure 1 XRD powder diffraction patterns of samples obtained at different temperatures. Depend on figure 1 It can be seen that when the reaction temperature is lower than 200°C, with the increase of the reaction temperature, the XRD pattern of the obtained sample has no obvious change, which is basically...

Embodiment 2

[0029] Weigh 50g of zinc metasilicate according to the liquid-solid ratio of 12mL / g, put it into a 1L reactor, add 600mL of distilled water into the reactor, seal the reactor, feed industrial oxygen, at a constant speed of 600rpm and a constant pressure of 1.0MPa, the temperature Start timing when it rises to 200°C, and set the hydrothermal reaction at this temperature for 1-3 hours; after cooling down to 70°C through the water cooling tube, the liquid-solid separation of the obtained substance is carried out, and then dried at 65°C for 10 Hour.

[0030] figure 2 It is the XRD powder diffraction pattern of samples obtained under different reaction times at 200°C. Depend on figure 2 It can be seen that when the hydrothermal reaction temperature is 200°C, as the reaction time is extended to 2h, the XRD pattern of the synthesized product does not change significantly, which is basically consistent with the XRD pattern of the raw material zinc metasilicate; continue to extend ...

Embodiment 3

[0032] Weigh 50g of zinc metasilicate according to the liquid-solid ratio of 12mL / g, put it into a 1L reactor, add 600mL of distilled water into the reactor, seal the reactor, feed industrial oxygen, at a constant speed of 600rpm and a constant pressure of 1.0MPa, the temperature Start timing when the temperature rises to 220°C, and set the hydrothermal reaction at this temperature for 1-3 hours; after cooling down to 70°C through the water cooling tube, the liquid-solid separation of the obtained substance is carried out, and then dried at 65°C for 10 Hour.

[0033] image 3 It is the XRD powder diffraction pattern of samples obtained under different reaction times at 220°C. Depend on image 3 It can be seen that under the condition of hydrothermal reaction temperature of 220 ° C, as the reaction time is extended to 1 h, the XRD pattern of the obtained sample has no obvious change, which is basically consistent with the XRD pattern of the raw material zinc metasilicate; whe...

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Abstract

The invention belongs to the technical field of artificial synthesis of natural minerals, and particularly relates to a synthesis method of high-purity calamine. The method comprises the following steps: with chemically pure zinc metasilicate as a raw material, weighing the zinc metasilicate according to a liquid-solid ratio of 8-16 mL/g, putting the zinc metasilicate into a reaction kettle, adding distilled water with a corresponding proportion into the kettle, and carrying out continuous reacting for 1-4 hours under the conditions that a rotating speed is 200-800 rpm, a pressure is 0.4-1.2 MPa and a temperature is 160-240 DEG C. Results of X-ray diffraction analysis of the calamine prepared by the synthesis method disclosed by the invention show that in an X-ray diffraction pattern, the characteristic peak of the calamine is very obvious, peak intensity is high, and the characteristic peak of aluminum-and-zinc-free soapstone and the characteristic peak of raw zinc metasilicate are very weak and not very obvious. Therefore, the calamine synthesized by the method disclosed by the invention is high in purity, good in crystal form, simple in reaction, easy to operate and convenient to produce and prepare, can provide a raw material for researching related properties of the calamine, can also be used for simulating related experimental tests such as thermodynamics during interaction of natural minerals and chemical reagents, and overcomes the technical problems that an existing calamine preparation method is complex in process, long in reaction time, not high in purity of obtained samples and the like.

Description

technical field [0001] The invention belongs to the technical field of artificial synthesis of natural minerals, and in particular relates to a method for synthesizing high-purity hemimorphite by a hydrothermal method. Background technique [0002] Hemimorphite is an important mineral resource, the chemical formula is: Zn 4 Si 2 o 7 (OH) 2 ·H 2 O. Hemimorphite has an important economic position in the zinc smelting industry. Because it belongs to silicate minerals and has a complex internal structure, the surface structure of the mineral is uneven, easy to muddy, and difficult to sort. The pure hemimorphite that can be used for research is relatively It is difficult to carry out relevant chemical theory research on it, resulting in a large amount of hemimorphite not being effectively utilized. Zinc silicate inorganic mineral is an ideal matrix material, its energy gap is 5.5eV, the exciton binding energy is 75meV, and it has good light transmission in the ultraviolet-v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/20
CPCC01B33/20C01P2002/72C01P2004/03C01P2004/45
Inventor 徐红胜朱志华朱炳龙李钧培吴娟钱亚楠苗凯
Owner JIANGSU UNIV OF TECH
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