The uniform dispersion of the fibers in the dispersion medium to achieve good interweaving between the fibers is the key to the excellent wet molding of the fiber composite.

A more straightforward method for the analysis and evaluation of the dispersibility of fibers in water or dispersion media is to analyze the results of the dispersion (11. The general analytical method for the dispersion of fibers has a laboratory standard method and equipment. The fiber suspension is prepared into hand-made paper, and then the paper is averaged, the fiber distribution and the like are tested to evaluate the dispersibility; 2 the fiber-dispersant system is studied, such as using a suitable transparent container for fiber suspension The liquid is observed, directly understanding the distribution of fibers, the occurrence of flocculation and its influencing factors for analysis and evaluation; 3 for a long time, the degree of beating is widely used to measure the dispersion of certain fibers, but it has been proved in the paper industry. The degree of beating only indicates the degree of dehydration of pulp, and it is used as a method and data for measuring various indexes of pulp, and there are deficiencies and defects in actual production and application (2. This is because the degree of resolving of the fiber is determined by the beating meter. Characterizing the dispersion effect of the fiber, there are actually defects.

The brucite fibers are sufficiently dispersed by mechanical grinding and agitation in solution. At the same time, in view of the intuitive, simple and effective method for observing the fiber-dispersant system, in this test, we use this method to analyze the dispersion effect of the fiber brucite, that is, the flocculation of the fiber after dispersion changes with time. As a main factor for judging the fiber dispersion effect and stability after dispersion.

The fiber brucite deposit of Shaanxi South Africa Metal Mining Company is a large-fiber fiber brucite mineral resource. The main chemical components of the fiber brucite are shown in Table 1. Mineral fiber brucites 3 serpentine asbestos microfibrous brucite and The main difference of chrysotile asbestos is: Firstly, the main components such as MgO, SiO2 and H2O+ are obviously different; secondly, the structural structure is different, the fibrous brucite is solid columnar fiber, and the asbestos fiber is hollow tubular fiber. The test equipment is XT type leaching mixer, -1 high power electric mixer, ND6-4L frequency conversion planetary ball mill, teletype blast drying oven, SX2-8-13 electric furnace.

12 Test step 121 preliminary dispersion test of brucite: preliminary consideration of three-factor and three-level tests of wet grinding time, beating time and beating concentration, change the sedimentation law after fiber dispersion and linear fit after a-dispersion with L9 time/h The law of fiber brucite clearing with time; b--the linear fitting of the fixed time is the height of the clear liquid within a certain time range of observation, it is easy to know that the slope B is inversely proportional to the stability of the dispersed fiber. relationship.

That is, the more stable the fiber is, the more slowly the flocculated and dispersed fibers are settled over time, and the slope of the fitted line is smaller.

The factor level of the preliminary dispersion of the fibrous brucite is shown in Table 2; the free-formed state of the fiber after dispersion in the observation tube and the straight line of linear fitting are seen.

The orthogonal test data in Table 3 shows that: 1 Among these three factors, the effect on the dispersion effect and stability of brucite fiber is 2 factor level 1 level 2 level 3 sound note A wet grinding time / min610 no Fast T dosage 015 and brucite mass ratio); B beating time / mrn806040 grinding speed 150r / mm, reversing twice; water solid C pulping concentration solid water ratio) 01

(Finish)

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