(1) the powder particle shape of powder particle shape is different, the time and the effect of mixing are not the same, such as approximate spherical particles in the friction force is
small, the speed of relative movement in the process of mixing, so easy to mix evenly; and angular particles within the large friction force, is not easy to mix evenly, compared with the former, mixing time is relatively longer.
small, the speed of relative movement in the process of mixing, so easy to mix evenly; and angular particles within the large friction force, is not easy to mix evenly, compared with the former, mixing time is relatively longer.
(2) The influence of the structural characteristics of mixing equipment for material mixing quality by using wet mixing mill mud, uniform and dense, good plasticity, and using biaxial mixer mixing mud quality is poor.
(3) Mixed with the length of time the general situation, the mixing time is long, the more uniform mixture. Mixing stage, uniformity increases very quickly, when mixing to a certain time, another long time effect on the uniformity of is not obvious. General to join the species more or poor dispersion of mud, mixing time should be longer. For example, clay brickrefractories used in wet grinding machine mixing, time is 4-10min; silica brick material about 15min; magnesia brick material needs 20 – 25min.
The mixing time should not be too long, otherwise there will be the following: 1) the size composition is then broken and change; 2) mud fever and the influence of moisture content, or because the mud is too hot, and the moldings will elastic aftereffect increases when pressurized and spallation occur.
(4) The adding sequence of feeding sequence has great influence on the mixing, if the coarse – fine powder is added at the same time, the fine powder into small particle concentration and the emergence of “white material easy to appear”.
Generally used for feeding sequence:
1) Course feed – water and waste paper pulp – fine powder.
2) Part of pellet feed – water and waste paper pulp – powder – residual particles.
In addition, the reasonable selection of binder and properly controlling the amount and uniformity of mixing the clay.
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