Preparation of calcium carbonate by microbe deposition

A technology of calcium carbonate and microorganisms, which is applied in the field of preparation of calcium carbonate by microbial deposition, can solve the problems of frequent shortage of resources, insufficient product grades, complex processes, etc., and achieve the effect of abundant resources, low cost and clean environment

Active Publication Date: 2006-05-31
SOUTHEAST UNIV
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Problems solved by technology

At present, its preparation process is mainly divided into mechanical crushing method and chemical reaction method. The former is facing serious problems such as frequent shortage of resources, high energy consumption, excessive dust, insufficient product grade, and unstable quality; while the latter is a...

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  • Preparation of calcium carbonate by microbe deposition
  • Preparation of calcium carbonate by microbe deposition
  • Preparation of calcium carbonate by microbe deposition

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Embodiment 1

[0020] A method for preparing calcium carbonate by microbial deposition, inoculating the strain Bacillus pasteurii on a medium containing a urea-containing substrate, carrying out shaking culture at 25-37°C, and controlling the initial pH at 6.0-8.0 , cultivated for 12 to 24 hours, took out the bacterial solution, and mixed with CaCl 2 Solution, finally, take out the precipitate, filter and dry to obtain calcium carbonate. In this embodiment, the temperature of shaking culture can be selected at 25, 30 or 37 °C, and the initial pH is controlled at 6.0, 7.0 or 8.0. The time can be selected from 12, 15, 17, 20 or 24 hours. In addition, in this embodiment, the bacteria liquid taken out can be heated to 50°C-70°C (such as: 50°C, 70°C, 55°C or 60°C), and CaCl can be added at 50°C-70°C 2 solution; this embodiment can also be mixed with CaCl at room temperature after taking out the bacterial solution 2 solution; present embodiment can also be mixed with the MgSO as nucleating agent...

Embodiment 2

[0022] The strain Bacillus pasteurii was inoculated into the Erlenmeyer flask containing the culture medium (the composition of the culture medium is shown in Table 1), and cultured in a constant temperature shaking incubator at 25-37°C, with the initial pH controlled at 6.0-8.0, and cultured for 12-37°C. Take it out for 24 hours, add CaCl at room temperature 2 Solution, produces precipitation rapidly, it is filtered, dried, and analyzed as calcite type calcium carbonate through X-ray diffraction ( figure 1 ), the purity is very high, and the particle shape is as figure 2 As shown, it is spherical, and residual bacteria are still attached to the surface of the particles.

[0023] Nutrients

Embodiment 3

[0025] The strain Bacillus pasteurii was inoculated into the Erlenmeyer flask containing the culture medium (the composition of the culture medium is shown in Table 1), and cultured in a constant temperature shaking incubator at 25-37°C, with the initial pH controlled at 6.0-8.0, and cultured for 12-37°C. Take it out after 24 hours, put it in a constant temperature water bath at 50°C to 70°C, and add CaCl 2 Solution, produces precipitation rapidly, it is filtered, dried, is calcium carbonate through X-ray diffraction analysis, and purity is very high, presents two kinds of crystal forms of vaterite and calcite ( image 3 ), the particle morphology is as Figure 4 As shown, it has various shapes such as spherical, square, and spindle.

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Abstract

The invention presents a calcium carbonate preparation method by microbe sediment. Inoculating the Bacillus pasteurii on the substrate with urea, surging culture under 25-37 deg.C, controlling the beginning ph at 6.0-8.0, cultivating 24 hours, fetching the seed liquid, adding CaCl2 liquor, and getting the calcium carbonate after fetching, filtrating, drying the deposit. This invention can make a full use of the microbe of the nature, the resource is abundant, the technics is simple, the surrounding is cleansing, and the cost is low. The calcium carbonate preparing from the sediment has high pureness and productivity, it can be used as stuffing, repairing of the crack of building, and the cementation of regenerative concrete.

Description

technical field [0001] The invention relates to a method for preparing calcium carbonate, in particular to a method for preparing calcium carbonate by using microbial deposition. Background technique [0002] Calcium carbonate is an important inorganic chemical product, widely used in industries such as rubber, plastics, ink, paper, coatings, sealants, adhesives, daily necessities, cosmetics, food and feed, and medicine. At present, its preparation process is mainly divided into mechanical pulverization method and chemical reaction method. The former is facing serious problems such as frequent shortage of resources, high energy consumption, excessive dust, insufficient product grade, and unstable quality; while the latter is also facing severe problems in the production process. There are problems of complex process, high energy consumption and smoke emission. Therefore, problems such as resource shortage, environmental pollution, and ecological damage existing in tradition...

Claims

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Application Information

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IPC IPC(8): C12P3/00C12R1/07
Inventor 钱春香王瑞兴王剑云
Owner SOUTHEAST UNIV
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