Microbial preparation method of strontium carbonate

A strontium carbonate and microbial technology, which is applied in the field of microbial preparation of strontium carbonate, can solve the problems of high energy consumption, poor product purity, and low conversion rate of strontium, and achieve the effects of simplifying the synthesis process, no secondary pollution, and easy cultivation

Inactive Publication Date: 2015-01-28
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are disadvantages such as high energy consumption, low conversion rate of strontium, poor product purity, and secondary pollution.

Method used

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  • Microbial preparation method of strontium carbonate
  • Microbial preparation method of strontium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare 0.1mol / L FeCl with deionized water 3 Solution, titrated with 60g / L NaOH solution at room temperature to a pH of about 11, causing a precipitation reaction, centrifuging the mixed solution, discarding the supernatant, adding deionized water to wash, centrifuging again, and repeating 3 times until The pH of the washing water is close to neutral, and the water is subpackaged for storage to obtain hydrated iron oxide.

[0028] Shewanella MR-1 (ATCC700550), the preparation of its culture medium: take 5g of beef extract, 10g of peptone, 1g of NaCl, 1L of distilled water, pH=7.0, after mixing evenly, sterilize by autoclave, obtain culture medium. Then take 100ml of the culture medium, and inoculate the iron-reducing bacteria into the culture medium. Cultivate for 24 hours at a temperature of 37° C. and a rotational speed of 250 r / min to obtain cultured iron-reducing bacteria. The cultured iron-reducing bacteria were added to the culture medium again, and expanded for...

Embodiment 2

[0034] Prepare 0.5mol / L FeCl with deionized water 3 Solution, titrated with 80g / L NaOH solution at room temperature to a pH of about 10, causing a precipitation reaction, centrifuging the mixed solution, discarding the supernatant, adding deionized water to wash, centrifuging again, and repeating 3 times until The pH of the washing water is close to neutral, and the water is subpackaged for storage to obtain hydrated iron oxide.

[0035] Shewanella MR-1 (ATCC700550), the preparation of its culture solution is as in Example 1. After the iron-reducing bacteria were expanded and cultivated for 24 hours, they were added to the reaction solution at an inoculum size of 2%, wherein the reaction solution contained 2mM, 25mM hydrated iron oxide, 25mM sodium lactate, and 25mM sodium bicarbonate. Then, at 30°C, anaerobic reaction was performed for 4d to obtain a white powder containing strontium carbonate. Then the solution containing strontium carbonate precipitation was left to stand...

Embodiment 3

[0037] The preparation of hydrated iron oxide is as in Example 2.

[0038] Geobacter sulfurreducens (ATCC51573), the preparation of its culture medium: take 1g of beef extract, 5g of peptone, 5g of NaCl, 1L of distilled water, pH=7.0, after mixing evenly, sterilize by autoclave to obtain the culture medium. Then take 100ml of the culture medium, and inoculate the iron-reducing bacteria into the culture medium. Cultivate for 24 hours at a temperature of 30° C. and a rotational speed of 200 r / min to obtain cultured iron-reducing bacteria. The cultured iron-reducing bacteria were added to the culture medium again, and expanded for 24 hours at a temperature of 30° C. and a rotational speed of 200 r / min to obtain a culture solution containing iron-reducing bacteria after the expansion.

[0039]Preparation of strontium carbonate powder: the reaction solution contains 2mM strontium nitrate, 25mM hydrated ferric oxide, 25mM sodium lactate, 25mM sodium bicarbonate, and at the same tim...

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Abstract

The invention discloses a microbial preparation method of strontium carbonate. The method comprises the following steps: adjusting pH value of a FeCl3 solution to 10-12 by the use of a NaOH aqueous solution at normal temperature by a titration method so as to carry out a precipitation reaction, centrifuging a mixed liquor, removing a supernatant, washing a precipitate with deionized water, and centrifuging to obtain hydrated iron oxide; preparing a reaction liquid containing strontium nitrate, sodium bicarbonate, sodium lactate and hydrated iron oxide by using water as a solvent, inoculating a culture solution which undergoes enlarge culture and contains iron-reducing bacteria to the above reaction liquid, and carrying out an anaerobic reaction at 20-50 DEG C for 2-5d to obtain a solution containing a strontium carbonate precipitate; standing for 1h, filtering, removing a supernatant, washing a white precipitate successively by using distilled water and absolute ethyl alcohol in turns, and drying to prepare a high-purity strontium carbonate powder. By wet-process one-step synthesis, the strontium carbonate powder in different granular sizes and shapes can be prepared, satisfying different purposes.

Description

technical field [0001] The invention belongs to a chemical preparation method of metal strontium, relates to a method for preparing strontium carbonate by microorganisms, which is suitable for preparing strontium carbonates with different shapes and sizes by using microorganisms. Background technique [0002] Strontium carbonate is an important industrial raw material, which is widely used in the production of picture tubes, displays, industrial monitors, electronic components, etc. Strontium carbonate is also the main raw material for the preparation of metal strontium and various strontium salts. In recent years, the demand for high-purity strontium carbonate has been increasing continuously for large-screen color TVs, color monitors for computers, and high-performance magnetic materials. The production of strontium products in developed countries such as Japan, the United States, and Germany has declined year by year due to the depletion of ore veins, rising energy costs,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P3/00C12R1/01
Inventor 谢婧婧宋天顺徐超王桂兰张鸿鹍金月娟
Owner NANJING UNIV OF TECH
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