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serbia hammer lead ore gold mill

lead ore - ore crushing solutions - dsmac

lead ore - ore crushing solutions - dsmac

Lead is a soft, malleable poor metal. It is also counted as one of the heavy metals. Metallic lead has a bluish-white color after being freshly cut, but it soon tarnishes to a dull grayish color when exposed to air. Lead has a shiny chrome-silver luster when it is melted into a liquid.

DSMAC is a professional lead ore crusher manufacturer in lead mining industry. We can supply many lead ore curshers such as lead jaw crusher, lead impact crusher, lead cone crusher, lead mobile crusher and so on. Metallic lead that results from the roasting and blast furnace processes still contains significant contaminants of arsenic, antimony, bismuth, zinc, copper, silver, and gold. Lead ore crushers are used widely in such ore curshing industry. Since the establishment, DSMAC has grown to become the largest crusher and screening equipment dealer in the China.

Jaw crusher for lead ore: Jaw crusher is used in primary crushing station. Lead ore jaw crusher can crush lead ore into small sizes. Thus, these small lead ore can enter into the lead ore mill such as ball mill and vertical mill for grinding.

Lead hammer crushers are widely used in small quarries with small capacities. That's because in such situation, the cost and the difficulty of changing and maintaining worn hammers are more acceptable to the quarry owners. However, once the quarry owners want to enhance the capacity to above 50-60t/h by one crushing plant, hammer crushers are no longer suitable. Using hammer crusher to do a big crushing work will lead to a passive situation of high consuming cost and frequent maintenance.

Lead cone crusher is the most common fine crusher, and usually used as final crushing machine. Lead ore cone crusher has four types such as spring cone crusher, symons cne crusher, hydraulic cone crusher.

As the important resource of nowadays industry production, ore minerals are required nearly in every business in the industry. Together with the professional crushing, grinding and screening technology of world class, DSMAC supply professional ore mineral processing equipments including Metal Ore MineralsNon Metallic Minerals crushing plants, grinding equipments, screening machines and feeding machines.

gold milling process -primitive and basic

gold milling process -primitive and basic

At the time, 1890, the Author said There is, of course, nothing for us to learn from this imperfect and rudimentary gold-extraction process described here, which is doubtless destined to disappear ere long, before the progress of scientific mining, now making itself slowly felt throughout the far East. I think it advisable, however, to put on record all such crude efforts, if only to enable us to trace more completely the evolution of our modern systems of mining, and to teach us by what widely-divergent methods different races of mankind have attempted to solve one, apparently simple, problem.

Their method of mining was then, and is now, the following: A small water-furrow is first brought in at the highest possible level on a suitable hill-side, and the stream is turned down the hill. By means of a heavy long wooden crowbar, shod with a long strongly- made chisel-pointed iron socket, and with the help of the stream of water, which rarely exceeds 50 cubic feet per minute, the surface- soil and weathered country-rock are loosened and sluiced away. No trouble is taken to save any of the gold washed down, except in one or two instances where rude riffles have been inserted in the tail-race; the race is, however, carefully searched for bits of quartz showing visible gold, which are picked out and put on one side. The surface of the shales is thus stripped, and any veins of gold that may be laid bare are then worked. The principal mining- tool is a rough kind of pick, and the use of explosives, or even of wedges, is quite unknown. Neither shovels nor barrows are used ; their places are taken by broad hoes and baskets, a pair of the latter, swung at each end of a stick and holding at least 70 pounds, being easily carried up steep grades by a Chinese miner. The tunnels, small and irregular, usually incline steeply upward ; they are rudely timbered, and as timber decays rapidly in this climate, these workings cannot penetrate far into the hills, but soon have to be abandoned, and the whole series of operations has to be recommenced.

A party of 27 miners, who owned and worked a rich hillside, considered themselves to be doing well when their entire days output (they do not work night-shifts as a rule) was a little over half a ton of quartz. The quartz, as extracted from the reef, is cobbed down with hammers to about pass a 1 J-inch ring, and is then carefully hand-picked, all stone showing visible gold, sulphurets or any other favorable indications being sent to the mill and the restbeing thrown away. From one-eighth to one-half is thus rejected. I have assayed many samples of this refuse rock, which carries from 3 to 10 pennyweights of free milling gold to the ton, so that it is quite worth milling according to our modern ideas.

At first the mode of crushing adopted by the Chinese consisted in heating the rock red-hot, quenching it in water and then pounding it down and rubbing it between two stomps. About 35 years ago atilt-hammer, made entirely without iron and having a stone head, was introduced, and is still much used by individual miners. About twelve years ago the battery of three to six hammers, worked by a water-wheel, was first employed. It is said to have been copied from mills for crushing the materials of joss-sticks. Tilt-hammer rice-mills are also built. Such water-mills are usually the property of a party of miners working together.

The foot-mill shown in Figs. 1 and 2 is of the usual type, from which there are but few unimportant departures. The entire falling weight is about 45 pounds, and the length of drop about 20 inches; as a rule, these mills are worked at 15 to 20 blows per minute.

The mill shown is built entirely without iron; the stone that forms the base of the mortar is a piece of hard quartzite or of barren reef-quartz, the same material being used for the hammer-head, which is firmly held in its socket by wooden wedges, the socket being kept from splitting by a stout hoop of rattan twisted round it. Some of the mills use iron hoops, and some have iron spindles for the hammer to work on; with these exceptions and one or two other very unimportant details, the construction is always the same, though the dimensions may vary a little. There is scarcely a house in the whole district that has not one of these mills.

The Chinese usually work these mills for about eight hours per day. A shovelful of quartz is first thrown into the mortar and the mill is then worked by the foot of the miner, who stands on one or other of the stones shown in the drawings, grasping the uprights or else a cross-bar that is sometimes fastened across them.

When the quartz is supposed to be crushed sufficiently fine, the hammer-head is propped up, and the crushed stone is scraped out and sifted through a circular sieve 15 inches to 20 inches in diameter, and about 1J inches deep. The sieve itself is made of thin strips of rattan about 0.1 inch in width. There are from 36 to 40 holes per square inch, so that the width of mesh varies between 0.04 and 0.06 inch. A man can crush in a working day, with one of these mills, from 70 lbs. to 140 lbs. of stone, according to its hardness.

The number of heads in a power-mill varies between 3 and 6, depending principally on the quantity of water available. As the district is well watered, the large majority are 6-stamp mills; out of 11 power-mills which it contains, 8 are 6-stamp mills. Figs. 3 and 4 show the usual type of the latter mills, from which pattern there is practically no departure. I could not even induce the Chinese to try a curved cam instead of a straight one, as they seemed to consider such innovations dangerous ; and they added that wood and water were both cheap enough. As will be noticed, the construction of the water-wheel is extremely crudethe water, which issometimes brought down very steep hills from considerable heights in small, highly-inclined ditches, strikes the flat buckets with considerable velocity, so that the wheel is partly an impact and partly a pressure wheel; the buckets are never more than half-filled at the best, and the wheel is sometimes allowed to wade in tail-water to the full depth of the shrouding. Much power is accordingly wasted, the amount of water consumed in driving one of these mills beingfrom 80 to 100 cubic feet per minute. The average number of drops of each head varies between 27 and 32 per minute; the length of the drop is about 2 feet, and the effective falling weight of the head is about 70 lbs. Thus only about one-third of the theoretical power of the water is utilized, but of course much of this loss of energy is due to the friction of the whole machine, notably between the straight cam and the tailpiece of the hammer. There are usually 3 men per shift working one of these mills, 2 being engaged in looking after and feeding the machine, while the third sifts thepounded stone as already described, throwing back under one of the hammer-heads whatever will not pass the sieve.

The cost of one of these mills complete, including a substantial shed over it thatched with palm leaves, but excluding the water- furrow, is said to be about very little, and they are supposed to last from 5 to 7 yearsneeding, however, constant repairs.

A stone hammer-head lasts from a week to a month, according to its quality. They are made, as in the foot-mills, from boulders of quartz rock, and it is mostly one mans business to search for these boulders in the bed of the stream, and, when found, to dress them into shape.

I tested the degree of fineness to which these mills reduce the quartz by differential siftings of a number of samples, taken by spoon-sampling the heaps of crushed ore lying at various mills. The results of some of my tests are given in the following table :

It appears from the above table that a great deal of the ore is crushed very fine (too fine, indeed), while some is not fine enough. As about 40 per cent, of the ore will pass through a 6,400 sieve, there must be much over-stamping, resulting, no doubt, in the production of a great deal of float-gold and slimes.

After the mill has been running for a longer or shorter period, according to circumstances, a clean-up takes place. The crushed ore is carried out in large wooden pails to a Chinaman, who washesit, squatting down by the side of a square pit, through which a small stream of clear water is kept running. The implement used for washing is a flat, somewhat conical wooden dish, cut from the spurs of certain hard-wood trees, and fashioned with much care. It is known as the dulang, and much resembles the Spanish-American batea, except that the section of the former is that of a very obtuse rounded cone, while the section of the latter is approximately that of a sphere.

A section of a typical dulang is shown in Fig. 5. Much importance is attached to the correct shape of the conical point, as it is in this that the precious metal is gathered together. The dulang is filled with from 10 to 15 lbs. of crushed stone, according to its size, and this is washed by a curious circular, combined with a slight undulatory motion, by which the particles of light, barren quartz are swept over the edge of the dulang, which is held just dipping below the surface of the water in the pit, while the heavier particles are collected in the rounded apex of the cone. When nearly cleaned, the gold and concentrates are transferred to a smaller, very carefully made and polished dulang, about 1 foot in diameter, in which thequartz is washed off as thoroughly as possible, and the gold, by a skillful jerk, is thrown clear from the sulphurets, and finally collected in a small brass dish. The sulphurets still retain much coarse gold, to which they cling obstinately. They are ground as fine as possible on a stone and re-washed several times, a good deal of the gold being thus separated and added to that previously obtained. Even then the sulphurets still carry much gold, the larger portion of which is free. They are stored away in jars while wet and allowed to rust, and after a time they are sometimes re-crushed and re-washed ; very often, however, they are merely allowed to accumulate and are not treated further. The first tailings are re-washed, and then stacked.

The cleaned gold is dried and melted over a small forge provided with a box-shaped wooden blower of the usual Chinese type. The fuel is charcoal. Tiny, conical crucibles, capable of holding about a couple of ounces of gold are used; the gold-dust is melted in these with borax and niter as fluxes; the slag is lifted off the surface of the gold when the latter is supposed to be clean, by means of an iron rod, and the gold is then granulated by pouring into water. If it is not considered to be sufficiently soft and pure it is re-melted, and the process is repeated until the gold is quite soft. The principal impurities removed seem to be sulphur, arsenic, a little copper, and perhaps traces of lead. Both the granulated gold and the crude gold-dust, as also gold got from river-washing, are used as currency in this district, coined money being scarcely ever seen here, and then only in the form of the old dollar.

In a partial wash-up at one of these mills, during my stay in the district, the following results, considered to be exceptionally good, were obtained, the quantity washed being as nearly as possible 2000 pounds of crushed ore:

As a general rule, there seems to be left in the tailings about one- third of the gold originally present in the ore, while there must be a considerable additional loss of float-gold carried away in the process of washing, due to the original fineness of some of the gold in the ore, and to the over-stamping already referred to.

From the average of these two assays it would appear that nearly one-third of the original proportion of gold is still left in the tailings. I might quote numerous other assays, but the results in all cases were approximately the same; there were no really clean tailings at all, in spite of the fact that they were all the result of handling sur- face-ores, where practically the whole of the gold was free. The losses above indicated appear enormous, but it must be remembered that the thrifty Chinamen throw nothing awaynot even tailings; however completely, in their opinion, these may be exhausted, they still pile them up and keep them. When, for any reason, their mill would otherwise be idle, they re-pound and re-wash their old tailings, and always get some gold out of them. The piles of tailings are, however, left exposed, so that a considerable proportion gets washed down into the streams and rivers by the heavy rains that occur at each change of monsoon ; and there are a good many Chinese of the poorer classes who make a sort of living by washing the sands in the river-beds, the gold they get being principally, to all appearance, that which has been thrown into the rivers by the miners up stream. It is noticeable that there is no gold, or very little, to be found in the rivers above the points where there are mines in operation. A fair days work of one Chinaman in the river-bed (say six hours actual work) was found, as the average of several trials, to produce an output of 7.3 grains of gold about .940 fine, worth say little in localcurrency. This quantity of gold was obtained by washing 22 large dulangs of gravel, each holding about 70 pounds of dirt.From the average of these two assays it would appear that nearly one-third of the original proportion of gold is still left in the tailings. I might quote numerous other assays, but the results in all cases were approximately the same; there were no really clean tailings at all, in spite of the fact that they were all the result of handling surface-ores, where practically the whole of the gold was free. The losses above indicated appear enormous, but it must be remembered that the thrifty Chinamen throw nothing awaynot even tailings; however completely, in their opinion, these may be exhausted, they still pile them up and keep them. When, for any reason, their mill would otherwise be idle, they re-pound and re-wash their old tailings, and always get some gold out of them. The piles of tailings are, however, left exposed, so that a considerable proportion gets washed down into the streams and rivers by the heavy rains that occur at each change of monsoon ; and there are a good many Chinese of the poorer classes who make a sort of living by washing the sands in the river-beds, the gold they get being principally, to all appearance, that which has been thrown into the rivers by the miners up stream. It is noticeable that there is no gold, or very little, to be found in the rivers above the points where there are mines in operation. A fair days work of one Chinaman in the river-bed (say six hours actual work) was found, as the average of several trials, to produce an output of 7.3 grains of gold about .940 fine.

It is interesting to note that in custom-milling, of which there is a good deal done here (many of the fossickers sending all the gold quartz they collect, whether by mining or picking out of the river- gravels, to one of the water-mills for crushing), the charge made is equal to just a few $U. S. per (long) ton of quartz, this payment including the washing of the gold, but not, so far as I can make out, its cleaning and melting.

It is obvious from the above description, that the total quantity of stone crushed by all the mills in the district, supposing them all to be going simultaneously, and including the foot-mills, could not exceed some 12 tons a day at the best, an amount that could be far more economically and efficiently handled in a five-stamp Californian mill of moderate power. Yet the total annual output of gold from this district (including, however, alluvial as well as reef-gold) is said to be 4861 ounces, fully .900 fine. The total number of men engaged in mining, in one way or another, is close upon one thousand.

lead ore crushing plant in nigeria

lead ore crushing plant in nigeria

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home - gold grind machine

home - gold grind machine

Thewetpan millis named by the diameter of roller. 1300, 1350, 1400, 1500, 1600 is suitable for selection of iron ore, molybdenum ore ,lead ore ,zinc ore, antimony ore and so on. 850, 900, 1000, 1100, 1200 is suitable for selection of gold ore. Astheir small investment, high yield, the production cost is

Thewetpan millis named by the diameter of roller. 1300, 1350, 1400, 1500, 1600 is suitable for selection of iron ore, molybdenum ore ,lead ore ,zinc ore, antimony ore and so on. 850, 900, 1000, 1100, 1200 is suitable for selection of gold ore. Astheir small investment, high yield, the production cost is

Gold Grind Machine Description: Gold grind machine will cooperate with materials and water to join in mixed , when they mix, the process will have a functions of stirring and squeezing, cone wet grinding machine can remove the air between materials, even stir, perfect moistening, can make material to be grind fineness. Gold Grind MachineCharacteristics:

Gold Grind Machine Description: Gold grind machine will cooperate with materials and water to join in mixed , when they mix, the process will have a functions of stirring and squeezing, cone wet grinding machine can remove the air between materials, even stir, perfect moistening, can make material to be grind fineness. Gold Grind MachineCharacteristics:

Wet Pan Mill for Grinding Gold Ore Brief Introduction: Wet Pan Mill for Grinding Gold Ore is widely used for selecting ferrous metals, nonferrous metals and nonmetals, as well as precious metals like gold and silver. It mainly consists of driving device, frame, water basin, grinding wheels and grinding base, etc. Wet Pan Mill for

Wet Pan Mill for Grinding Gold Ore Brief Introduction: Wet Pan Mill for Grinding Gold Ore is widely used for selecting ferrous metals, nonferrous metals and nonmetals, as well as precious metals like gold and silver. It mainly consists of driving device, frame, water basin, grinding wheels and grinding base, etc. Wet Pan Mill for

Wet pan mill (wet pan grinding mill) is also called wet grinding machine and gold grinding mill, its a modernized grinding machine, commonly used in the small and medium size concentrate factory. It is widely applied to the grinding and benefication of all kinds of metal minerals, non-metal minerals, rare metal and other materials. Such

Wet pan mill (wet pan grinding mill) is also called wet grinding machine and gold grinding mill, its a modernized grinding machine, commonly used in the small and medium size concentrate factory. It is widely applied to the grinding and benefication of all kinds of metal minerals, non-metal minerals, rare metal and other materials. Such

High quality mercury gold 1200 grinding Wet Pan Mill is used for grinding gold ore, especially small gold rock stone, which can grind into 100-150mesh. Many customers from Africa would like to import wet pan mill because of low cost and high productivity. The most important thing is that, with mercury, our customers can get

High quality mercury gold 1200 grinding Wet Pan Mill is used for grinding gold ore, especially small gold rock stone, which can grind into 100-150mesh. Many customers from Africa would like to import wet pan mill because of low cost and high productivity. The most important thing is that, with mercury, our customers can get

Introduction of Jaw Crusher: Jaw crusher is necessary equipment for ore crushing. Jaw crusher mainly applies for primary and crude crushing of all kinds of hard rocks and block materials. Jaw crusher has been widely used in the fields of building materials, metallurgy, ore, water conservancy, construction, and hydropower, etc. Jaw crusher has great advantage

Introduction of Jaw Crusher: Jaw crusher is necessary equipment for ore crushing. Jaw crusher mainly applies for primary and crude crushing of all kinds of hard rocks and block materials. Jaw crusher has been widely used in the fields of building materials, metallurgy, ore, water conservancy, construction, and hydropower, etc. Jaw crusher has great advantage

Introduction of double roller crusher: Double roller crusher is a roll type crushing machine with simple structure, less over crushing happens and the tooth shape, size, are arranged on roller can change along with the materials. Double roller crusher can be employed to crush hard and soft ore for coarse and fine crushing. Specification of

Introduction of double roller crusher: Double roller crusher is a roll type crushing machine with simple structure, less over crushing happens and the tooth shape, size, are arranged on roller can change along with the materials. Double roller crusher can be employed to crush hard and soft ore for coarse and fine crushing. Specification of

Introduction to Hammer Crusher Hammer crusher can crush medium-hard and crispy materials, such as limestone and coal with compression resistance less than 150Mpa. The main application of hammer crusher include: metallurgy, cement, mining, coal, building materials, electricity, and chemical industry and so on. Small hammer crusher is suitable for home or small factories, and can

Introduction to Hammer Crusher Hammer crusher can crush medium-hard and crispy materials, such as limestone and coal with compression resistance less than 150Mpa. The main application of hammer crusher include: metallurgy, cement, mining, coal, building materials, electricity, and chemical industry and so on. Small hammer crusher is suitable for home or small factories, and can

Check the sealing part of the equipment of the gold-rolling machine to ensure that its various humidity parts are normal and there is no leakage, if it is necessary to deal with it in time. In this part is very important, if it occurs leakage or abnormal phenomenon, it will have a great impact on

1. The operator must be qualified by the manufacturer. After fully understanding the structure and performance of the equipment, the operator can be employed for operation. The operator must abide by the relevant safety and handover system.2. Before the work, strictly follow the lubricating oil regulations, refuel, and keep the oil volume properly, the oil

1. Electric roller feeding speedThe feed rate is the amount of electricity that can be passed through the electric mill per unit time. When the ore feeding speed is very low, the amount of ore in the electric roller is small, not only the productivity is low, but also the result of the air play

The flank clearance and top clearance of the size gear of the gold-plating machine will cause the vibration of the pinion. Therefore, we must first check whether the flank clearance and top clearance of the large and small gears meet the requirements. The side clearance and top clearance of the gear drive should be appropriate.

henan baichy machinery equipment co., ltd., china | tradewheel

henan baichy machinery equipment co., ltd., china | tradewheel

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