BS EN 12912:2012 pdf download – Products used for treatment of water intended for human consumption — Barite 5.3.2 Bulk density packed The bulk density packed shall be in the range of 2 500 kg/m 3 to 2 600 kg/m 3 . 6 Chemical properties This European Standard specifies the minimum purity requirements for barite used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product. Depending on the raw material and the manufacturing process other impurities may be present and, if so, this shall be notified to the user and when necessary to relevant authorities. Users of this product should check the national regulations in order to clarify whether it is of appropriate purity for treatment of water intended for human consumption, taking into account raw water quality, contents of other impurities and additives used in the products not stated in this product standard. Limits have been given for impurities and chemical parameters where these are likely to be present in significant quantities from the current production process and raw materials. If the production process or raw materials lead to significant quantities of impurities, by-products or additives being present, this shall be notified to the user. The composition of the commercial product shall conform to the requirements specified in Table 1. After filling, washing and commissioning of a filter system producing drinking water, barite should not increase the concentrations of chemical parameters (see [1]). NOTE Water extractable substances, determined in accordance with the method for granular materials given in EN 12902, can be used to estimate the leaching of the chemicals specified in EN 12902. 7 Test methods 7.1 Sampling Prepare the laboratory sample(s) required by the relevant procedures described in EN 12902. 7.2 Analysis 7.2.1 Particle size distribution The particle size distribution shall be determined in accordance with EN 12902. 7.2.2 Bulk density loose The bulk density loose shall be determined in accordance with EN 12902. 7.2.3 Bulk density packed The bulk density packed shall be determined in accordance with EN 12902. 7.2.4 Main product – barium sulfate 7.2.4.1 Principle Melting of mineral with sodium carbonate followed by disintegration in water and filtration to recover water insoluble carbonates. The solid is treated with hydrochloric acid solution and the acid insoluble fraction is filtered off. Barium sulfate is precipitated by addition of ammonium sulfate solution and gravimetrically determined. 7.2.4.2 Reagents...
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