Vermiculite production process

Vermiculite mineral

Vermiculite vermiculite ore grade of only 30% of the gangue content of generally 50% or more, so the need for sorting operations, separated from the ore gangue and impurities. Vermiculite mineral composition according to differences in degree of difficulty depending on the selected level, processing methods are divided into two kinds of dry and wet. Which uses the combination of dry and wet process for sorting. Dry beneficiation method used for sorting high grade, coarse grain vermiculite quarry; and wet dressing used for sorting the lower grade and smaller size of the vermiculite quarry. Dry mainly by multi-stage crushing and screening process or crushing - screening - Wind election process; wet dressing is used broken, selective grinding, flotation, jigging process.

Vermiculite ore dressing and more hand-selected wind election law, belong to the dry dressing, hand-selected method is based on the appearance of vermiculite characteristics (such as color, luster, size, etc.) for selection, only the larger separation of gangue and mineral , elected as a product concentrate can be sold to processing plants.

Young wind field can be divided into election law, and cyclone separation unit method. To improve the winnowing effect of wind before the election to be crushing, screening. Vermiculite is a layered mineral, preferably broken hammer crusher, vibrating screen and rotary screening using sieve. Winnowing process see below:

Production of expanded vermiculite

Shijiazhuang glorious garden vermiculite mineral processing plant production process is divided into four processes: raw materials preparation, preheating, calcining and cooling.

Raw material preparation: from vermiculite to vermiculite of mining raw materials crushing classification

Preheat: vermiculite ore chip moisture content has some influence on the expansion property. Generally when the water content of vermiculite ore than 5%, should be dry. But also on vermiculite materials were preheated. Using natural drying (sun or air dry) and dry kang dry.

Calcined: I plant using shaft kiln. Vermiculite one of the most critical processes,

Cooling: out from the calcining kiln should be rapidly expanded vermiculite natural cooling from the high-temperature environment, in order to maintain the strength of vermiculite, not brittle.

I plant the production process of expanded vermiculite used the following two:

① ore - "broken - the" wind-election (to the sand) - "vermiculite concentrate -" dry - "broken -" impurity - "Rating -" warm-up - "burning -" cooling - "expanded vermiculite.

② ore - "Broken -" screening - "Air-election (to the sand) -" vermiculite concentrate - "warm-up -" burning - "cooling -" expanded vermiculite.