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1、INTERNATIONAL STANDARD IS8 6153 First edition 1989-09-01 Chromium ores - Increment sampling Minerals de chrome - ichantillonnage par pr m is the minimum number of wagons obtained by equa$lon (61; C is the load of the wagon, in tonnes. The result obtained shall be rounded up to the nearest whole numb
2、er to ensure adequate precision. Four increments shall be taken from each wagon selected. When the load of the wagon is not 66 tonnes, the number of in- crements to be taken from each wagon shall be obtained from the equation where nw -is the number of increments to be taken from wagons other than 6
3、6 tonnes wagons; C is the load of the wagon, in tonnes. The result, pbta,ined shall be rounded up to the nearest whole number, as little imp,rovement will be obtained by going to a higher whole tXanbe$ . I,. 7.1.3 The sampling of ore from stockpiles shall be conducted in accordance with the method s
4、pecified in 7.1.1, during the formation of the stockpiles or during the reclaiming of the stockpiles for their transfer to other places. 7.1.4 During the handling of ore by means of periodically filled and emptied containers (grab, bucket, skip, etc.), in- crements shall be taken manually, either on
5、 the new surface ex- posed during taking of the ore by the handling device or from ore poured out by the device onto a special platform, without making hollows, The number of containers to be sampled shall be not less than the required number of increments. The interval equal to a number of containe
6、rs (grabs, et Q is the mass of consignment, in tonnes; g is the mass of ore taken by the handling container at one time, in tonnes; n 7.2 7.2.1 is the required number of increments. Mechanical sampling The sampling of ores during the loading or unloading of wagons, ships, stores, bunkers and in form
7、ing stockpiles by means of continuous action handling devices shall be carried out, using mechanical sampling devices, on the stream of ore falling from one handling device to another at a fixed in- terval of mass or time. 7.2.2 The number of cuttings by mechanical sampling devices shall be not less
8、 than the required number of increments. 7.2.3 The interval between taking increments from a consign- ment can be taken as a fixed interval of either mass or time and shall not be changed during the entire course of sampling of a consignment. 7.2,4 The mass interval between taking increments shall b
9、e determined using equation (4) in 7.1 .I .4. 7.2.5 The time interval between taking increments shall be determined using the equation f=)*Q Gn . . . (10) where t is the time interval between taking increments, in minutes; Q is the mass of consignment, in tonnes; G is the maximum flow rate of the be
10、lt conveyor, in tonnes/hour; n is the number of increments required. IS0 6153:1989 (E) Annex A (normative) Hammer and shovel method The hammer and shovel method shall be used in sampling of ores containing lumps ofgreater than 100 mm in size. of chippings shall be 4 kg and be proportional to that of large lumps of ore being sampled. It shall be ascertained either visually or from past experience. hicrements shall 620.11 Descriptors : minerals and ores, chromate minerals, samples, sampling. Price based on 11 pages -,-,-