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Natural alta-mud modification method

A bentonite and natural technology, applied in the field of modified bentonite and its preparation, can solve the problems of high content of quartz and cristobalite, low content, insufficient awareness of the hazards of quartz and cristobalite, etc., to improve product purity, increase whiteness, Eliminates the effect of restrictions on application conditions and regions

Active Publication Date: 2006-02-08
北京京盛国泰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] Currently modified sodium bentonite, the viscosity of its 5% dispersion is generally impossible to be greater than 600cp, resulting in the direct use of sodium bentonite as a suspending agent, the stability and use effect of the dispersant are affected
[0022] 2. The content of quartz and cristobalite in modified bentonite is high:
[0023] Insufficient awareness of the hazards of quartz and cristobalite in modified bentonite, and no effective technology and process in all work to reduce the content of quartz and cristobalite in the finished modified bentonite to less than 5%
[0024] 3. The thermal stability of organic bentonite is low:
In this area of ​​work, there is no major breakthrough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Implement with reference to the technological process of Fig. (7).

[0063] Hebei Xuanhua natural bentonite raw ore has a water content of 24% (wt%) and contains 12.3% (wt%) of quartz and cristobalite. After selection, remove large variegated and darker soil clods and stones visible to the naked eye, and cool and dry until the moisture content is 17%, and coarsely crush until the particle size is less than 5mm. Take 1 ton and add 5 tons of demineralized water. , stirred at a stirring speed of 120rpm for 4 hours, with 5% (wt%) oxalic acid solution and 5% (wt%) disodium hydrogen phosphate solution, the pH of the slurry was adjusted under stirring conditions, to pH at 6.0 ± Within the range of 0.5, the change within 30 minutes does not exceed the range of 6.0±0.5, continue to stir for 1 hour, let stand for 3 hours, siphon the suspension, and enter the modification process. The suctioned suspension is about 4.2M 3 60 liters of 10% (wt%) NaOH solution was added at a stirri...

Embodiment 2

[0074] With reference to the technological process of Fig. (7), in the process that NaOH implements modification, add 5kgNaF simultaneously as modification auxiliary agent, other operating methods are with embodiment 1, and gained final product is 330kg. The field emission scanning picture of the modified bentonite is shown in Figure (6), and other results are listed in Table 1.

Embodiment 3

[0076] With reference to the technological process of Fig. (7), carry out modification through NaOH, adjust pH to 9.0 with 10% (wt%) oxalic acid solution and 5% (wt%) sodium dihydrogen phosphate, and maintain 30 minutes and be no more than 9.0 ± 0.5 After the range, add 1kgN(CH 2 COOH) 3 And average molecular weight is the commodity polyvinylpyrrolidone (PVP) of 44000~54000, and other operation is with embodiment 1, obtains final product 330kg. The product test results are listed in Table 1.

[0077] test

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Abstract

The invention discloses a method for modifying natural alta-mud which comprises the following steps, (1) choosing and drying the raw ore, (2) coarse crushing, (3) charging water for slurrying, separating slurry from impurity substance, (4) charging strong alkali, modifying adjuvant, pH regulator, complexing agent and polymer surface active agent, (5) centrifugalizing, drying the suspending liquid, disintegrating and packaging.

Description

technical field [0001] The invention discloses a modification method of natural bentonite, in particular refers to the preparation of modified bentonite with low quartz and cristobalite content and high viscosity by using natural bentonite minerals as raw materials and the preparation method thereof, which belongs to the category of new material technology. Background technique [0002] Bentonite, also known as bentonite, bentonite, montmorillonite, smectite, bentonite, Guanyin clay, etc., is a widely distributed non-metallic clay mineral. [0003] The properties and characteristics of bentonite are mainly determined by the structure of montmorillonite contained in it. Montmorillonite is a two-dimensional planar layered structure of aluminosilicate, which consists of two layers of silicon-oxygen tetrahedral sheets and one layer of aluminum-oxygen (hydroxyl) octahedral sheets sandwiched between them. Its general structural formula is: Al 2 o 3 4SiO2 2 ·nH 2 O, (n>2); ...

Claims

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Application Information

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IPC IPC(8): C04B33/04
Inventor 王家君
Owner 北京京盛国泰科技有限公司
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