The placement of Hydrocyclone

The force of gravity is no significant meaning in Hydrocyclone separation, unless it's separated with the case of very coarse particles. In principle, have no need for special consideration the gravitational direction, i.e., the axis in the hydrocyclone may be put in almost any direction, vertical, diagonal, horizontal, and in some cases can be placed the other way up, it might work as usual. As an example, a factory australia wide from the application to get a particular separation purification purposes, offers to hydrocyclones inverted to realize satisfactory results.

XC4 hydrocyclone
For solid – liquid separation is concerned, under normal circumstances should not be placed horizontally or upside down, and the inclination should be used primarily vertically, so your flow at the conclusion, even though the specified horizontal,, hydrocyclone should also make the axis of the horizontal direction we have a small dip between solid – with ritual cyclone underflow liquid separation using orifice clogging problem, under normal circumstances would require hydrocyclones vertical or inclined installation, unless large diameter hydrocyclone axial larger size, don't let vertical mounting outside of the workplace, there is no need to use the cyclone level. Gravity separation within a large solid – liquid hydrocyclone likewise have some influence on the separation efficiency could be affected. Meanwhile, the cyclone flow phenomena simply speaking, makes many of the particles along the the top of overflow discharge port, especially when placed horizontally, may have known as a lot of particles with all the overflow discharge. While vertically, sedimentation of large particles, you possibly can avoid a brief circuit with the discharge flow. Therefore, thinking about the separation of solid – liquid separation hydrocyclone general ought to choose to install vertical and inclined position.
For liquid – liquid separation cyclone the situation is unique. Generally speaking, the liquid – liquid separation Hydrocyclone axial dimension larger diameter and small, vertical installation often inconvenient. Even though set up in the manifold and other considerations, make vertical installation is quite difficult, greatly helping the cost. More to the point, whilst liquid – liquid separation when a smaller proportion with the distinction between each media, usually not many tenths of gravity separation in liquid – liquid cyclone goes that basically can not work, so from the perspective in the force of gravity, mounting the vertical position with the separation performance without significant improvement. Phase from the light, the sunshine phase separated in the overflow discharge port, if placed perpendicular to the axis, horizontal axis, the core across the horizontal direction of light phase, that's prepared to overflow port at a rate direction movement, helping the separation efficiency. Phase separation of media from light look more favorable horizontal axis. Determined by these reasons, the liquid – liquid cyclone, either stand-alone or combined, are basically horizontal mounting, there may be little case of any vertical installation.

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Flotation machine operating procedures

Items to check before operation

First, to prevent debris into the flotation tank, in order to avoid jammed impeller, clogging false bottom circulation holes and channels affect pulp cycle and, if necessary, should play an open mine gate rinse tank to eliminate debris.

Second, check valve ore, hold switch and flexible. Production of other requirements depending on the options, the adjustment of discharge, to maintain a desired level height pulp.

Third, all of flotation machine and blade drive V-belt must be secured neatly smooth, elastic consistency.

Fourth, the cabinet must be smooth rubber lined neatly, false bottom and steady flow plates, baffle must be complete, set stable.

Fifth, check the air line is smooth, if unimpeded should be clear immediately.

Six, check liquid level control system is flexible and reliable.

Seven, if filled with grease spot inspection of each oiler mixing bucket, the proper amount of grease to the bearing ② Check all loose fasteners.

Eight, hand plate moving mixing bucket pulley device to observe the vertical axis rotation is flexible impeller is collision, friction deflector phenomenon.

From the car order

First, the empty slot start

First to the mine, started mixing drum, start-up and connected to the mining midge box flotation machine, start the DC groove adjacent pulp flotation machine until completely submerged cover.

Second, after the shutdown started full tank

At full tank starts, follow the pulp flow direction, until the next station after starting the process equipment in order to open mixing drum, the first drive, and then open the ore slurry flows into the tube so that the slot until the flooding so far, but not the pulp from the mixing drum along spills, and then put into a predetermined chemical, resume normal stirring operation. Successive start from the last tank to the first slot.

Boot sequence: 1) Make sure the air intake pipe tune lid open. 2) Start the flotation machine motor. 3) Start stir

Mix barrel. 4) began to mine.

Third, according to the process from the car

Open roughing, fine Ⅰ, Ⅱ fine flotation machine, flotation open sub-ore slurry tank.

Parking order

First, the flotation machine downtime order emptying pulp

1, stop to mine.

2, to the mine after a complete stop, open the rear gate. 3, stop mixing drum 4, the normal operation of the flotation machine.

5, you can see the cover, turn off the flotation machine motor. 6, play an open valve to drain away the ore slurry tank surplus.

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Xinhai Gold processing project in Mali Africa

Gold processing project in Mali Africa can be an EPC service project. It turned out signed by the African customer and Xinhai group when he stumbled on China to have an inspection. The consumer was originally to work with.. .method. But good ore dressing experiment done by Xinhai group customer, they finally think the entire mud cyaniding carbon plasma process is best choice. The project is extremely evaluated from the African customer. The subsequent contents are beginning of processing plan which was done by Xinhai mining design institute and beneficiation research.

Firstly, foundation of beneficiation scheme design
A, The relevant information and processing procedure collected inside field.
B, The agreed capacity: 1000 t/d.
C, The washability test report was presented with by Xinhai ore beneficiation research institute.
D, Additional unknown conditions temporarily processed according to conventional processing procedure.
Secondly, the structure scale, product and operation system
A, The modern mill production scale is 1000 t/d, implements the device of continuous operation, lasting for300 days annually.
B, Mineral extraction methods: Dump leaching the coarse grains and taking advantage of the complete mud cyaniding carbon plasma method process the fine particles, finally while using gold wet smelting process.
C, Product program: 99.9% gold bullion.
Thirdly, the beneficiation test
The client provide two ore samples, respectively thought as PY - 2 and PY - 3, PY - 2 ore sheet is coarse particles and PY - 3 ore sample is okay clay particles. Its small laboratory test. We draw the subsequent conclusions with the contrast of different sorts of test schemes like heap leaching, gravity separation and all of mud cyanidation method.
The coarse ore PY-2 is suitable for heap leaching technique to recovery gold. Undressed ore heap leaching use the sodium hydroxide to safeguard alkali with dosage of 8 kg/t; Dosage of sodium cyanide is 4 kg/t, heap leaching time is 168 hours, the leaching rate of gold is 88.55%.
The fine clay particles PY - 3 is correct for the mud recycling gold cyanide solution. When grinding fineness of undressed ore cyanide is- 200 mesh and 82.88%, calcined lime is utilized to defend the bottom, the amount of calcined lime is 8 ~ 9 kg/t; The dosage of sodium cyanide is 1 kg/t, cyaniding for 24 hours along with the leaching rate of gold is 88.00%.
Good above data and the practical situation in the mine and site photo, Xinhai beneficiation research institute made the first stage on the project:
By screening and grinding cyanide heap leaching process to recovery gold, the undressed ore heap leaching way is useful for the coarse grain and fine grinding one utilize cyanide test method. As soon as the separation of mine ore, use heap leaching method to process the coarse grain, the leaching rate of gold can be had at 66.67%.The fine one can possibly be cyanided, and making use of 9.5 kg/t dosage of calcium oxide to protect alkali round the clock, the leaching rate of gold can be had at 85.57%. Total gold recovery rate is 85.17%. The following picture is the procedure engineering flow scheme for African Mali project expressed by Xinhai.
This would be the screening classification part, by way of a feeder the undressed ore were fed into your belt conveyor then transported for the double layer vibrating screen for screening. Heap leaching the screened out + 30 mm and + 5 mm one, as well as the screened out- 5 mm one were listed in the cyclone classification machine firstly. Over time of grinding, the bottom flow from the cyclone alongside the overflowed ones then glance at the complete mud cyaniding carbon adsorption systems. Using the research into the core sample as well as the practical situation from the site, the heap leaching production is 1600 t/d, 10thousand ton for 2 months and many types of-slimed cyaniding is 2400 t/; Cyanide leaching analytic the electrolytic parts, as well as the - 60 mesh ones were transported to the leaching tank for leaching adsorption through the pum.
For heap leaching parts, throughout the steps of heap building, spray and expensive liquid adsorption, the gold mud was obtain by parsing and electrolyzing the gold-loaded carbon. For wed smelting parts, analytical electrolytic gold mud are  over the melting system regularly, and finally get the gold of 99.9%; For tailings parts, damming the first years tailings plainly and backfilling the other year plus the later tailings.
The planning passed over the practice in the African clients inspection and achieved the expected index. The African client is quite enthusiastic about that.

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Acquisition of Delta Industrial Valves: Weir Minerals expands valve offering

The Weir Group PLC ("Weir") has agreed to acquire Delta Industrial Valves Inc. ("Delta" or "the Company"), a leading US-based manufacturer of knife gate valves for the mining, oil sands and other industrial markets, for an enterprise value of up to US$47 million. Based in Niles, Michigan, Delta employs approximately 70 people and generated EBITDA of approximately US$6.2 million over the last twelve months.

Initial consideration of US$37 million will be payable on completion of the acquisition, US$21m in cash (funded from existing bank facilities) and US$16m in new equity, enabling the owners of Delta to share in the future benefits of the combination. Up to a further US$10m in cash will be paid over the next 18 months, contingent upon the business meeting certain profit growth targets.

The acquisition extends Weir Minerals’ leading presence in mining and oil sands markets by expanding the division’s portfolio of valve products, particularly knife-gate valves, for use in the transportation of slurry. The transaction will be immediately earnings accretive, and post-tax returns (before integration costs) are anticipated to exceed Weir’s cost of capital in the first full year of ownership. Completion of the acquisition is expected to occur within the next few days.

Keith Cochrane, Chief Executive of the Weir Group, said:

“Weir is a global leader in process critical products in the mining and oil sands markets and the acquisition of Delta further strengthens our comprehensive offering to customers. Delta’s strong brand and reputation, together with Weir’s global capability, mean we will be able to offer our customers new ways to increase efficiency at a time when the industry is focused on reducing costs and increasing productivity.”

Mark Johnson, Vice-President of Delta, said:

“We are delighted that Delta will be joining one of the world’s leading engineering businesses.   Delta will be able to take advantage of Weir’s presence in more than 70 countries, bringing our valves technology to customers all over the world. We see significant opportunities ahead in what remain long-term growth markets."

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Introduction of Xinhai Mining Machinery Company

Ball Mill Lining Ceramic Linings

Ball Mill Lining Ceramic Linings – Mill cylinders are made from two different ceramic formulations, one having silicon oxide as the dominant material and the other having aluminum oxide as the dominant material. These differences in oxide content allow some choice to be made with respect to the most acceptable wear-off. Comparative laboratory tests show that the high alumina composition is at least 25 to 100 percent more resistant to impact abrasion than is the more siliceous composition, very low wear rates with only trace amounts of alumina. Rubber – Special abrasion resistant low-ash rubber linings have been developed for milling of contaminant-sensitive materials. Batch contamination is reduced to such a low lever that spectrographic analysis is the only quality control technique that can measure the negligible inorganic contamination introduced into the batch from the lining. Because of the resiliency of rubber, which contributes to the abrasionresistance of the lining, negligible wear-off is produced and no appreciable quantity of organic material is found I milled products. Subsequent ignition of ground material in an oxidizing atmosphere removes the rubber worn off into the batch, leaving only a trace amount of oxide contamination. Colloidal carbon will remain it the batch is fired in a neutral or reducing atmosphere. Low-ash rubber has been utilized successfully in mill jars and large production mills for either wet or dry size reduction of alumina, steatites, titanates, zirconates, ferrites, nuclear ceramics, high temperature refractories, and other material whose end properties might be altered by alumina or porcelain wear-off. Polyurethane – a polyurethane lining has the greatest abrasion resistance and the highest tensile and tear strength of any synthetic rubber. It provides a unique combination of toughness, resilience, and load bearing properties. Polyurethane affords excellent resistance to oils, greases, and fuels and is unaffected by oxygen, ozone, and weathering. It can be used in service with aqueous salt solutions, dilute mineral acids and greases, aliphatic hydrocarbons and other non-polar organic compounds. Metal - Mill cylinders made with abrasion-resistant steels and other metals are satisfactory where metallic contamination is not important or where further treatment will be undertaken to remove the metal particles. Since faster grinding rates are typical with steel ball mills, more economical production will be the result. All but the finest white and pastel paints can be milled in a steel lined unit, and steel is definitely recommended when milling ceramic ferrites in both solvent and water dispersions. Many types of inks, carbon paper coatings, wax compounds, rubber compounds, and even food stuffs can be milled in the faster possible time in steel ball mills

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Innovations on The Impact of Economic Slowdown

Compared with other countries in the world, Chinas economic growth rate has been enviable. But the updated data in China shows a significant trend in speed, which caused a big problem for other countries. Under the affect of the Chinas economic slowdown, what impacts on earth affect the overseas machinery manufactures?

Siemens, BASF, United Technologies and Hitachi, Ltd. today showed that the impact of Chinas economic slowdown brought about a big impact on them.

The situation is becoming more terrible as Siemens playing large orders in China less and less. Hitachi said its first-quarter construction equipment sales in China fell more than 40%. And this trend at least would get rebound till January in the next year. Caterpillar has reduced production in China and the joint technology company also lowered its subsidiarys sales estimate, which mainly caused by the weak demand from China.

However, problems are often accompanied with forceful tackles and changes of national policy. Some measures would mean that the country will change some of the existing development policies. For example, the Government promoted the high-end development of the network value chain in the industrial structure, so that to get rid of the status of Chinas low value-added producer.

Whether affected by the pressure from Chinas economic slowdown or the challenge from Chinas changed policies, mining machinery industry should take it as an opportunity. companies should set the high-end development of industrial structure as the basic requirement, improve innovation in the field of technology and production to avoid traditional, aging, backward production. so as not to increased burden in their own development and progress of national industry .

Yantai Xinhai Company has innovation as a cornerstone to exceed other companies. It always takes high-end technology, equipment and services to meet the challenge, and make achievements. For example, dry tailings discharge technology as a good solution to deal with the problem of mining tailings and its market is becoming larger and larger. With unique wear-resisting rubber applying in all kinds of mining equipment to improve their wear-resisting performance, slurry pumps, cyclones, and other products are in short supply. Only remaining at the forefront of technological innovation can the company ranks in the forefront of the social economy.

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