how to calculate nickel ore grades?

Answer 1

Call a mining engineer or a geologist.
If you say that is an ORE - then somenone had researched this mine and some lab results are known.

Look:
http://www.cvrd.com.br/cvrd_us/cgi/cgilua.exe/sys/start.htm?infoid=1715&sid=274


Found in nature in association with iron and sulphur, nickel is a transition element that presents ferrous and non-ferrous metal properties such as resistance to corrosion, alloy formation, ductility and electro-coating settlement among others. By virtue of this characteristic to confer properties to the more noble metallic steels, nickel is demanded mainly by the metallurgical sector, and 63% of such demand is destined to the production of stainless steel.

Other major applications of nickel are non-ferrous alloys, super-alloys, batteries and galvanoplasty. Nickel ores can be either sulphated (primary) or lateritic (oxidated). In Brazil there is a predominance of lateritic ores.



The deposits of lateritic nickel are predominantly superficial and not very deep. This facilitates open cast mining of the ore, in a selective manner and with the use of medium sized equipment. Normally the use of explosives is unnecessary or quite restricted.

The ore is mined with the assistance of excavators and placed in trucks. To guarantee the quality of the ore, homogenization piles are used before it is fed into the mill. Mining must be selective, in order to control the nickel, cobalt, magnesium, iron and aluminum content of the material that is mined.


Processing of lateritic ores

The processing of lateritic minerals can be carried out by pyrometallurgic (“metallurgy by fire”) or hydrometallurgic processes (“metallurgy by water”), depending on the type of ore:

Ores that present a high content of nickel (>2%) and magnesium (>10%)
· Pyrometallurgy (Fe-Ni): has greater unit costs per ton of mined ore. In this process, after mining, the ore is sent to dryers to remove its humidity. Next, it is sent to a furnace, where the concentrated “ferronickel” is formed, with the production of slag. The concentrate has a 40% nickel content and is used as a raw material in the stainless steel industry.


Ores having a lower content of nickel (<2%) and a magnesium content that does not exceed 8%
· The hydrometallurgic route (leaching under pressure – HPAL): in the HPAL process, the ore can first be enriched by means of physical processing, with the removal of silicate (if present). After this, the ore is fed together with sulfuric acid in an autoclave, where nickel, cobalt and some impurities are dissolved. After dissolving, the solution containing nickel is separated from the impurities and submitted to successive stages of precipitation and purification, generating purified solutions of nickel and cobalt. From these solutions, high purity metallic nickel and cobalt is produced by electrolysis. The metals are commercialized on the London Metal Exchange and are used for the most diverse applications, including the stainless steel industry, superalloys for the aerospace industry, coin manufacture and the chemical industry.
· The Caron Process (a combination of pyro- and hydrometallurgy): applicable to ores with a content above 1.5%. In this process the mineral is dried and roasted, being leached with the use of ammonia. After leaching, stages of refinement similar to those previously described are also used for the production of metal. The Caron Process has a limited application today because of its higher costs per ton of nickel produced, when compared to the Fe-Ni and HPAL. Processes.

Answer 2

Teach a man to fish, he can eat for a lifetime I won't do it for you, but I'll teach you how. Multiply your percentage by how much the portion is worth ex: Homework is 30% of your grade, you got 80% on it, 80 * .3 = 24 out of a possible 30 points Add up all of the categories Now to find out what grade you need on something to keep or acheive a grade, you subtract the grade you want from your total points, and divide by the category percentage ex: Using the example before, you want a C in the class. Tests are worth 70%, Homework 30% 70 - (.3 * 80) = 70 - 24 = 46. 46 / .7 = 65.71% in the test category to keep the grade. Now say if you want to calculate an individual category, same rules apply. ex: You have 3 tests each worth 100 points. The first two tests you got 50 and 60 out of 100. (300 total points * .65) - 110 = 85% to get your hypothetical 65% Hope I helped