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Method for preparing high-purity sodium-based smectite, white carbon black and size-controllable nano silicon dioxide from cristobalite-rich calcium-based bentonite ore

A calcium-based bentonite, sodium-based montmorillonite technology, applied in the direction of silicon dioxide, silicon oxide, chemical instruments and methods, etc., can solve the problem of low degree of secondary resource recycling, low resource utilization rate, resource waste environment, etc. problems, to achieve the effect of high value-added development and utilization, high resource utilization, and recycling

Active Publication Date: 2013-06-12
INNER MONGOLIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In view of the common problems in the development and utilization of solid mineral resources in my country, such as low resource utilization rate, resource waste, serious environmental pollution, and low degree of secondary resource recycling, the Ministry of Science and Technology, the National Development and Reform Commission, the Ministry of Land and Resources, and the State The "Key Points of Solid Mineral Resources Technology Policy" (Guo Ke Fa She (2009) No. 176) jointly issued by the four ministries and commissions of the Energy Bureau clearly requires the development of basic and forward-looking application technologies such as high-efficiency separation of non-metallic minerals and material purification technology. Therefore, how to realize rich The economical, efficient and sustainable utilization of cristobalite-containing bentonite mineral resources is the key to the deep processing of such bentonite mineral resources

Method used

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  • Method for preparing high-purity sodium-based smectite, white carbon black and size-controllable nano silicon dioxide from cristobalite-rich calcium-based bentonite ore
  • Method for preparing high-purity sodium-based smectite, white carbon black and size-controllable nano silicon dioxide from cristobalite-rich calcium-based bentonite ore
  • Method for preparing high-purity sodium-based smectite, white carbon black and size-controllable nano silicon dioxide from cristobalite-rich calcium-based bentonite ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The ore composition of calcium-based bentonite is 61.4% of montmorillonite; 28.9% of cristobalite; 5.3% of quartz; 4.4% of feldspar (see X-ray diffraction pattern figure 2 ), the cation exchange capacity (CEC) is 78.3mmol / 100g, and the blue absorption capacity (MB) is 33.6g / 100g. The determination methods of cation exchange capacity and blue absorption capacity are based on "Bentonite" (GB / T20973-2007).

[0033]Calcium-based bentonite raw ore is transformed into sodium-based bentonite after crushing, pulping, modification, centrifugation and other steps to remove easily removable impurity minerals. The sodium bentonite after modification and removal of impurities consists of: montmorillonite 65.1%; cristobalite 33.0%; quartz 1.9% (see X-ray diffraction pattern image 3 ), the cation exchange capacity (CEC) is 94.2mmol / 100g, and the blue absorption capacity (MB) is 40.6g / 100g.

[0034] Add 0.5 mol / L sodium hydroxide aqueous solution to the modified and impurity-remove...

Embodiment 2

[0037] The raw ore composition of calcium-based bentonite and other corresponding test methods are the same as in Example 1.

[0038] Calcium-based bentonite raw ore is crushed, pulped, modified, centrifuged and other steps to remove easily removable impurity minerals and modified into sodium-based bentonite at the same time. Add 0.3 mol / L sodium hydroxide aqueous solution to the modified and impurity-removed sodium-based bentonite slurry, the amount added is 1 / 3 of the mass of bentonite, and the sodium-based montmorillonite obtained above is subjected to alkali extraction and separation, and the reaction temperature is controlled At 70°C, the reaction time was 6 hours. After the reaction, the sodium-based montmorillonite obtained by filtering, washing (to pH Figure 6 ), the cation exchange capacity (CEC) is 129.8mmol / 100g, and the blue absorption capacity (MB) is 55.9g / 100g. And collect the filtrate for further processing.

[0039] The collected filtrate is settled, filtered...

Embodiment 3

[0041] The raw ore composition of calcium-based bentonite and other corresponding test methods are the same as in Example 1.

[0042] Calcium-based bentonite raw ore is crushed, pulped, modified, centrifuged and other steps to remove easily removable impurity minerals and modified into sodium-based bentonite at the same time. Add 0.25 mol / L sodium hydroxide aqueous solution to the sodium-based bentonite slurry after modification and removal of impurities, the amount added is 1 / 3 of the mass of bentonite, and the sodium-based montmorillonite obtained above is subjected to alkali extraction and separation, and the reaction temperature is controlled At 80°C, the reaction time was 5 hours. After the reaction, the sodium-based montmorillonite obtained by filtering, drying, and washing (to pH Figure 7 ), the cation exchange capacity (CEC) is 129.9mmol / 100g, and the blue absorption capacity (MB) is 56.4g / 100g. And collect the filtrate for further processing.

[0043] The collected f...

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Abstract

The invention belongs to the deep processing technology of non-mental bentonite ore. The method mainly consists of following processes: modification purification, alkaline exaction separation, high-purity sodium-based bentonite preparation, high-purity white carbon black preparation, size-controllable nano silicon dioxide preparation and the like based on cristobalite-rich natural calcium-based bentonite as a staring point; and finally, the purity of the obtained sodium-based bentonite is larger than 96%, the purities of the white carbon black and nano silicon dioxide are larger than 99%, thesize of the nano silicon dioxide is controlled to 52nm and 68nm, and the properties of four products are excellent. The invention provides the deep processing method of the cristobalite-rich calcium-based bentonite, the method has the advantages of high resource utilization and small environment pollution, and is economic and practicable, thereby providing a technical basis for energy consumption-low cost-low and added value-high development and utilization of cristobalite-rich bentonite ore resources.

Description

technical field [0001] The invention belongs to the deep processing technology of non-metallic bentonite minerals. It is mainly suitable for purifying natural calcium-based bentonite rich in cristobalite into high-quality high-purity sodium-based montmorillonite, high-purity white carbon black and nano-silicon dioxide with controllable size after modification, impurity removal and alkali separation. Background technique [0002] Bentonite is a clay mineral mainly composed of montmorillonite, also known as montmorillonite. The International Clay Research Association (AIPEA) defines bentonite as "rocks with montmorillonite minerals as the main component, and clay or clay rock with smectite minerals reaching the usable content". [0003] The main mineral composition of bentonite is montmorillonite minerals, the content varies from 40% to 90%; followed by other clay minerals, including kaolinite, dickite, halloysite, chlorite, allophane, Attapulgite, etc., as well as silica mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40C01B33/12B82Y40/00
Inventor 苏海全张兵兵付晓娟
Owner INNER MONGOLIA UNIVERSITY