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Steel ball material effect to the mineral processing technology

  • The steel ball in the process of grinding ore itself by wear, is ground into iron or iron in pulp. This volume is not great, according to China's present level, a ton of ore grinding ball consumption of about 1.5kg, but to follow some of the operations is influential. If the grinding products the next step is treated with acid to chemical process, then the grinding products iron will first consumption of sulfuric acid, the acid consumption increase. For this reason, South Africa and North America some uranium or gold is often employed in the pebble mill grinding, the purpose is to reduce the iron on the back of wet chemical process effect. In the laboratory in order to reduce the impact on the product and the use of iron magnetic grinding ore. These are mineral processing engineering and technical personnel of knowledge.

    While the grinding process of iron processing effect is often neglected. In recent years, many studies have shown, grinding wear down the iron will soon oxidation in pulp oxygen consumption, at the same time leads to the pulp and the mineral surface potential change, and influence the flotation behavior of. Some research indicates that, wet grinding, electrochemical interaction between minerals and steel balls, wear iron inhibited mineral natural flotability flotation, to consume more collectors. R.L Pozzo ( Pozzo ) research indicates that, in the grinding and polishing conditions, mineral and grinding medium between the two electrode and the three electrode combination produces a current role and the floatability of the minerals have a close relationship. Before grinding, electrochemical action to produce ferric hydroxide covering layer reduces mineral flotability. In the grinding conditions, grinding medium produced pieces of metal and mineral interactions between pairs of mineral inhibition plays a major role, the role is particularly significant for magnetic pyrite. H.W.Xiang's research suggests that, when the grinding medium and the sulfide ore is exposed, forming a galvanic current, as a result of the grinding medium and the sulphide ore open-circuit potential of oxidation-reduction reaction. The galvanic reaction through the mixed potential principle control, with low open circuit potential material acts as an anode, and is subjected to surface oxidation of sulfide minerals, thus separating selectivity may increase or decrease. Sulfide mechanical and chemical reaction will reduce the separation selectivity, finally pointed out that the sulfide separation selectivity can be achieved by selecting proper grinding medium and condition to realize. In order to reduce the influence of iron on mineral processing technology of steel ball, researchers mostly from the selection of anti corrosion materials grinding ball. R.H Sellers ( Sailors ) of the study pointed out that South America, now widely used casting high chromium steel ( C2% ~ 3%, Cr12% ~ 25% ), the steel ball wear faster than ordinary steel ball low 75% ~ 80%. The article with grinding test, scanning electron microscopic analysis and electrochemical measurement of corrosion current, this kind of steel corrosion mechanism. The results showed that, the ball is carbonization structure and martensite structure, hardness, wear resistance and corrosion resistance, and high and difficult to corrosion of chromium. This characteristic makes it have strong abrasion resistance. J.W. Jane ( Jang ) study, wear of the grinding media behavior and medium hardness, chemical composition, phase structure and corrosion / erosion characteristics related to pulp. Some research indicated that, the martensite structure of ball hardness is big, the structure of high carbon steel ball wear small. While in high chromium steel, single structure of martensite wear than martensite and ferrite coexistence structure. The article with the heat treatment process for manufacturing three structure types: ball, the ball of martensite ferrite ball, martensite ferrite ball. Through the test, electrochemical measurement, flotation, found with martensitic and ferritic structure of high Geqiu wear little reason is: martensitic structure hardness, abrasion resistance and impact resistance, Ferritic and high chromium content is easy to form a passivation layer, so that the abrasion wear reduction. High Geqiu with corrosion resistance and wear resistance properties of chromium, but is not the low prices, and our country is a lack of chromium state, this is not our ball in the direction of the development of. There are pointed out in front of the ball, can not be ignored the influence of density. Chromium metal density of 7.4g / cm3, 8.9g / cm3 nickel metal density, the high Geqiu density than forging steel ball is apparent on the low side, while the hard nickel alloy steel density and forged steel balls, so the use of high Geqiu will lead to reduced productivity, but with a hard nickel alloy steel ball will not reduce the productivity. This problem is worthy to be in production in the observation study and confirmed. We can from the other direction for wear resistant and corrosion resistant material to manufacture steel ball. In a V.Rajagopal article reported, adding copper to help reduce the abrasion rate of wet grinding. While the front of the hard nickel steel has high hardness, high temperature resistant and corrosion resistant performance, is the ideal wear-resistant ball. At present our country has no hard nickel alloy steel ball and lining board production, the author is for research and development, in order to end our country hard alloy steel ball and lining board of. The last nickel crop little, price is expensive, nickel metal as a strategic material control use, do not have the development of hard alloy steel ball and lining board condition. But the situation changed drastically, nickel crop soars, the formation of oversupply, nickel metal prices fell, seek new nickel metal consumption channels. Moreover, China's second largest nickel Yuanjiang garnierite nickel -- for, production of metal nickel or nickel oxide are not feasible, while the production of nickel-iron is feasible, and the produced ferronickel is looking for sales. Use of ferronickel production hard nickel alloy steel ball and lining board in China should be the development of wear resistant steel ball is an important direction.



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