Learn more about mineral processing!

There is a long history to extract metal from ore directly with heap leaching process. This process is firstly used in low-grade copper deposits and then used in the leaching of low-grade uranium ore. With the development of technology and economy, heap leaching technology has been widely used in low grade oxidized ore to leach gold. What’s more, the rising of activated carbon adsorption gold technology makes the heap leaching process widely used in the whole world, especially low-grade gold deposit and small gold mine. With the rising gold prices in recent years, it further stimulated the rapid development of the gold industry. As the exhaustion of high-grade gold ore, researching on middle-low grade and refractory gold ore and strengthen the traditional gold beneficiation undoubtedly have become the main trend in global gold beneficiation industry. With its low construction investment, quick production result and good flexibility, gold heap leaching process has rapidly occupied ...

Hydrocyclone   can be used in concentration, classification, desliming and separation according to the differences of material density. Hydrocyclone is featured with small coverage area and high classifying efficiency, but there are many factors that affect the hydrocyclone work. Actually, it is very difficult to determine the optimal working parameters in the actual hydrocyclone production, so what are the parameters that influence the hydrocyclone work? Generally, the parameters that affect the hydrocyclone work can be divided into two kinds of parameters: structural parameters and operational parameters. The structural parameters include the diameter of cyclone, diameter of feeding port, diameter of overflow pipe, output size, inserting depth of overflow pipe, length of cylinder and cone body and the size of cone angle. Coarse particle classification often adopts large diameter hydrocyclone, and the fine grain is in the opposite. If the processing capacity is large, hydrocy...

Recently, Shandong Xinhai Mining Technology & Equipment Inc held a board meeting and unanimously passed the proposal of acquiring Shandong Jiangxin Design Institute. Founded more than ten years, Shandong Jiangxin Design Institute has been engaged in mine engineering construction EPC, engineering design and consulting service, and obtained “Class B in Gold Mining Engineering in Metallurgical Industry”. As a senior mineral processing EPC provider, Xinhai has completed more than 500 mineral processing EPC projects, whose equipment has been exported to over 90 countries and regions, and won ISO9001:2015 international quality management system certification, CE certification, self-support import and export right, International contracting projects qualification certificate, intellectual property management system certification, CNAS Certification, HI-tech enterprise qualification. This acquisition would gather the joint force of “strong foundation”, and it was another major step for ...

Flotation process   is the common copper ore dressing method. This paper will introduce the copper flotation process of a copper ore dressing plant in Shanxi province. At present, the proved reserves and inferred reserves of this mine is up to 4 million tons. Generally, boundary grade of   copper ore   is 1.5%, but the copper ore grade of this plant is up to 2.33%. Besides, there are also more than 4.4 million tons of possible reserves, and the copper ore content reaches 2.25%. This deposit occurs in the skarn formed by pendant formation of Palaeozoic sedimentary rock. And the sedimentary rock near to the contact zone has metamorphosed into calcium magnesium silicate and magnetite. The main copper minerals are copper pyrites at the lower part of the deposit. And the content of bornite and chalcocite are increased at the upper part. Besides, there are10-30% magnetite, which is easy to be separated into magnetite concentrate from tailings. However, the full potential a...

Spiral classifier   and   hydrocyclone   are both mineral processing classifiers. The mineral processing classifier generally include four kinds, increased flow hydrocyclone classifier, cone classifier, a centrifugal classifier( hydrocyclone ) and mechanical classifier ( rake classifier, spiral Classifier, and Floating tank classifier). Today, we will only choose Spiral classifier and hydrocyclone this two equipment to make a detailed comparison, that is because they are the most widely used classifiers in our mill plant, at present. Spiral Classifier is a kind of mechanical classifier, and it is composited by a u-shaped water tank, spiral device, transmission device, lifting mechanism, bearings and other parts. The working principle of spiral classifier is: the milled pump was fed into the u-shaped slot from spiral classifier’s feeding mouth, after the continuous rotations and stirrings of the spiral...

With the implementation of “One Belt And One Road” strategy, Chinese enterprises speed up the “going abroad” pace again, so cross-cultural cooperation turns into an overwhelming trend. At the same time, some conflicts will be caused inevitably by differences in language, law, humanistic environment, ethnic culture, regional culture and enterprise culture. Xinhai is dedicated to   “mineral processing EPC service”   for more than 20 years, whose projects are spread across more than 70 countries and regions in the world. Long project construction and operation cycle is the biggest feature of mineral processing EPC plant generally, which means that Xinhai staffs are required long times’ collaboration to work with partners who have different religious beliefs, customs, thinking way and communication method. In another word, Xinhai has experienced 20 years of intercultural cooperation and has overcome various difficulties then accumulated a lot of experience. Malaysia CNMC CI...

Recently, CNMC Goldmine Holdings Limited (or CNMC) (SGX: 5TP) successfully signed mining development strategic partnership agreement with Xinhai (NEEQ: 836079), which was aiming at leading the Malaysia mining step into a new peak through this powerful combination. In May 2017, Xinhai assumed CNMC 700 TPD   gold CIP   project in Malaysia, and provided the whole set of customized mineral processing EPC service from mine design, equipment manufacturing, civil construction to installation & debugging, standard reached. The project was put into production only within six months. At first, the designed processing capacity was 600t/d, but the actual processing capacity was up to 700t/d; the expected gold recovery rate was 93%, but the actual recovery rate was as high as 95%, which maximized the benefits for CNMC Company. This cooperation fully showed the strong mineral processing power, professional customized solution and thoughtful customer service of Xinhai. On the bas...

Ball mill   is the largest consumption equipment of mining plant. The ball mills operating state directly influences the whole mill plant productivity. Its also the biggest investment equipment of mill plant, and the wastage of the ball mill has a direct relationship with mill plant operating costs. Therefore, it is very important to maintain and overhaul the ball mill regularly, reasonable and effective maintenance can promote the ball mills operational rate and service life. Firstly, checking the lubricating system. Lubrication system is in the key part to reduce mechanical wear and tear, including the ball mill. Generally, you should replace all the old lubricating oil and clean the machine thoroughly after the mill was put into work as long as one month. After that,  you should change the lubricating oil about every six months for each time. During the ball mill operation, you should check the condition of all the lubricating points and the oil level height, at lea...

The theoretical basis of   flotation cell   is approximately same, namely the separation process is realized by flotation froth in the pulp according to the physical and chemical properties of mineral particles. In the flotation process, there is one thing that plays a very important role in the whole process——flotation froth. So what’s the role of flotation froth in the flotation process? Motor triangular belt drives the impeller to rotate, and the centrifugal effect forms the negative pressure, then the flotation froth is formed under the impeller centrifugal force. The main purpose of flotation froth is to gather hydrophilic minerals, improve mineral processing precision and decrease the difficulty of mineral processing. For example, copper, lead processing are much easier to achieve high-quality and high efficient separation. Froth plays a very important role in the   flotation process . Because of these froth, ore grain or mineral powder can adhere to the st...

  On November 28, 2017, the Second Overseas Mining Investment Summit, hosted by China Mining Association, opened in Beijing. With the theme of cross-industry promotes “One Belt And One Road” mining global cooperation on production capacity, this summit was intended to create a cooperation platform between mining industry and other industries. Ministry of Land and Resources relevant departments and China Geological Survey relevant departments under the charge of people and more than 400 specialists and experts from mining enterprise, geological prospecting unit, industry associations and scientific organizations took part in the summit. Weixing Cao, vice minister of Ministry of Land and Resources attended and addressed the opening ceremony. Cao pointed out, as the basic and leading industry, geology and mining industry occupies an important and special position in international production capacity cooperation. At the same time, because of its industry positioning and ...

Thickener   belongs to dehydration equipment, commonly used for the thickening of ore concentrate and the dewatering of the tailings before filtration, as well as the thickening and purification of a liquid containing solid particles in the chemical industry, building materials, and water source &sewage treatment industry. In the processing of dewatering tailings,   thickening   is mainly used to make use of the recycling water and to store the tailings in the tailings dam. Otherwise, to improve the operating process such as the thicker slurry is needed when it is too thin, so thickener is one of the necessary dewatering machines in the process of miming solutions. For now, mechanical discharge thickener, also named rake-type thickener, is most widely used which can be operated continuously, and there are three types concluding center -transmission thickener, peripheral roller transmission thickener and multilayer thickener,and the peripheral roller transm...

Recently, another good news came from Iran Sharaf Abad 300t/d gold flotation project, the processing capacity reached to 350tpd, which was far higher than expected designed capacity (300tpd), so the annual output value was increased at least 10 million yuan. Since its official launch in September 2016, this project has attracted high attention from customers, local government and industry peers. This was also a milestone case of Xinhai mineral processing EPC service in the Middle East mining market. A bit memory of this project in Iran always gives people deep feelings. In fact, Iran Sharaf Abad Company has obtained the exploration right and mining certificate of this gold project as early as in 2006. However, due to the large construction amount, the Iranian customers didn’t find the appropriate investor, so this project has been delayed so down. Until 2016, Jiangxi Geological Exploration Bureau decided to invest in this project and reached an agreement with Iranian customers. ...