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Mining machinery

Application in magnetic separation iron ore processing

Application in magnetic separation iron ore processing

Abstract:Electromagnetic gravity washing machine is an efficient equipment for magnetic separation of crude concentrate. High grade magnetite concentrate with a grade of over 65% can be produced by magnetic separation of low grade ore or intermediate crude concentrate. The feed grade is 50-57%, the column concentrate grade is increased by 10-15%, the ribbon grade is 60-63%, and the column concentrate grade is increased by 3-6%. Electromagnetic gravity washing machine can also be used before filtering high-efficiency concentration equipment, concentration can reach more than 60, both to improve the grade 


Electromagnetic gravity washing machine is a new type of weak magnetic separation equipment. The equipment draws lessons from the separation principle of the original permanent magnet magnetic concentrator and the combined effect of the moving magnetic field on the magnetic minerals. Design a new type of equipment to reduce the magnetic field intensity from top to bottom. It is an ideal equipment for improving concentrate quality. The permanent magnet magnetic system is replaced by the electromagnetic magnetic system, so that the constant magnetic field can be changed into a magnetic field which can be adjusted at any time.

The electromagnetic magnetic system adopts discontinuous DC power supply mode, so that the magnetic field in the coil separation area has time and time. It improves the agglomeration, dispersion and agglomeration of the original magnetic gathering machine. Eight electromagnetic coils were designed from top to bottom in the electromagnetic gravity washing machine, and six of them were supplied with power from top to bottom to form magnetic force on magnetic minerals moving downward.

According to the requirement of beneficiation process, a special magnetic system with high magnetic field intensity in upper beneficiation area and low magnetic field intensity in lower beneficiation area at feeding point is designed. The problem of the rising of the upper part of the mine point and the rising speed of the lower part of the mine are balanced.

The equipment is equipped with a slurry specific gravity detection device and an automatic control system to automatically adjust the magnetic field intensity of the separation. Automatic Control Principle: The system detects the change of ore quantity entering the electromagnetic aggregator at any time. When the ore quantity increases, the proportion of the pulp increases, the magnetic field intensity of the electromagnetic system increases automatically, and the magnetic mineral downward attraction increases. When the ore quantity decreases, the proportion of the pulp reduces automatically the magnetic field intensity of the electromagnetic system. Reduce the downward attraction of magnetic minerals. This does not require manual participation, and the equipment always works at its best.


The equipment control system designed and manufactured by our company has fundamentally changed the traditional way of adjusting magnetic field with contacts and voltage regulators. Siemens PLC200 is used to control the power regulator, which greatly improves the reliability of the system operation. The input and output modules adopt UNIMAT series modules produced by Shenzhen UniMAT Automation Technology Co., Ltd. The input modules adopt UN231-7PD22-0XA0, and the output modules adopt UN232-0HB22-0XA0. The reasons why we choose products produced by Shenzhen UniMAT Automation Technology Co., Ltd. are as follows:


1. The UN200 and UN300 series modules produced by Shenzhen UniMAT Automation Technology Co., Ltd. are fully compatible with PLC of Siemens S7-200 and S7-300.

2, from a technical point of view, the billion dimensional module is higher in some aspects than SIEMENS's current module. For example, Siemens's new 1200 series of modules, the output module bus current consumption, Siemens 1200 for 80mA and Uygur's production of UN232-0HB-0XA0 only 40mA reduced power consumption, enhance the power carrying capacity.

3. From the point of view of after-sales service, UniMAT promised a five-year warranty, which exceeded the warranty period promised by Siemens. We had problems in the application that were not the module itself. UniMAT also helped us to find a positive way to solve them. We thank you for your call.

4. Considering the price, UniMAT's products are much lower than the price of Siemens module, which gives us more profit margin and competitiveness. The UN232-0HD22-0XA0,4-point analog output module introduced by EV is not available by Siemens, which not only saves costs, but also reduces the trouble caused by poor interface contact.

5. From the point of view of the supply cycle, all the products of UniMAT are in stock. Compared with Siemens, the supply cycle is much shorter.


In addition, our electromagnetic gravity washing machine has been extensively used in many water plants of mining companies in Tangshan area; through production practice, it has achieved better results than the original magnetic concentrator, stable operation of the equipment, low power consumption, high unit area processing capacity, no noise pollution, no lubrication maintenance. And other characteristics, the equipment is safe and reliable, and has been affirmed and praised by users.

The control cabinet we produced is shown below.

This is the control cabinet which was produced by SIEMENS module before:

   PLC panal with UniMAT PLC,


    Modules working now,


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Intelligent control system in mine flameproof feeder switch

Intelligent control system in mine flameproof feeder switch

AbstractIn view of the characteristics of the mine flameproof feeding switch control system, UniMAT UniMAT Company has developed a special mine three-phase AC and leakage monitoring module for three-phase electrical measurement, which can realize the measurement of phase voltage, current, zero-sequence voltage, zero-sequence current and leakage resistance. The results show that the use of UniMAT CPU224+ mine three-phase AC and leakage monitoring module not only reduces the cost, but also meets the national standard for leakage protection, simplifies the configuration scheme, optimizes the program design, and easily upgrades the scheme from the basic KBZ630Z to the more demanding KBZ800Z and KBZ1000. Z and other models, expanded, three-phase AC and leakage monitoring module can be used in various AC monitoring system, in various occasions play a greater role。

Keywords: three-phase AC monitoring, UniMAT PLC, CPU224, EM231, feed switch



1. System overview

Mine Flameproof Vacuum Feed Switch (hereinafter referred to as Feed Switch) is mainly used in underground coal mine. It is used as the main switch and branch switch of power supply system or as the feed switch of mine Flameproof mobile substation (opening the rear cover) in the line of AC 50Hz, voltage 1140V, rated current 400A, 500A, 630A, 800A respectively. The board can also be used as a large capacity motor for infrequent starting. It has the functions of overload, short circuit, under voltage, leakage protection (selective leakage protection) and leakage blocking. The product can be applied to the monitoring system of coal mine safety in mine flameproof vacuum feed switches.

2. system configuration and function realization

1). Hardware configuration of KBZ630Z control system

Display: a 4 line Chinese character text display screen with a protection level of IP65.

Programmable controller: UN200 series CPU224Q UN 214-1AF23-0XB0 piece.

Expansion module: three-phase AC and leakage monitoring module UN 231-0BH22-0XA0

(Note: type KBZ800Z requires two three-phase AC and leakage monitoring modules)


2).system architecture

The system consists of a control system consisting of UniMAT PLC and text screen and an executive system consisting of a vacuum circuit breaker. As shown in the figure. The CPU carries on some logic control, and the mine module mainly collects AC voltage, current and leakage resistance signals, so as to realize the system monitoring and control and complete the leakage locking, overload, short circuit, phase breaking, under-voltage and over-voltage protection functions, with the advantages of high intelligence, stable performance and reliable operation

3). system difficulties

The system is mainly to ensure that the leakage protection action time is less than 50ms and the short-circuit protection action time is less than 100ms, so to ensure that the CPU acquisition and processing speed is very fast, UniMAT PLC uses high-frequency microprocessor, instruction processing speed is 3-10 times higher than ordinary PLC, UniMAT UN200 PLC acquisition and control cycle time is 12ms. Plus peripheral equipment time 30ms, a total of 42ms, to achieve the standard requirements of the device.

4). monitoring function design

Adopting text display screen and cooperating with UniMAT UN200 series small PLC, it can display and memorize the working state, parameters and fault types of feed switch, and can modify and adjust the specific parameters. It has friendly user interface and good man-machine conversation function. It can greatly improve the efficiency of judging and removing faults.

All analog signals are processed into digital signals, which have the characteristics of strong anti-interference ability, simple wiring, large amount of information, reliable and accurate control.

It has complete functions of self-test, self-diagnosis and fault simulation experiment, and can conveniently check whether the protection and control system is normal or not.

5). system function realization


The feeder switch fully considers the working environment of coal mine, and integrates machinery manufacturing, automation, measurement and control technology, instrumentation, computer application technology and other disciplines. Its main technical indicators are as follows:


Voltage level: 1140V/660V; frequency: 50HZ;

The total rated current is 800A and 1200A, and the working current of single unit can reach 400A.

Leakage blocking protection: additional DC detection, 1140V-40K Europe, 660V-22K Europe;

Leakage protection action: 1140V-20K Europe, 660V-11K Europe;

Short circuit protection: 3-10 times the rated current.

Overvoltage and undervoltage protection: 0.75Ue<U<1.15Ue;

Over temperature protection and over limit protection.


The switch equipment has a leakage test and an over current test button, and it can detect the feeding switch protection function at any time

At present, most domestic feeder switches adopt Siemens + transmitter + leakage protector control scheme, although the scheme can meet the system requirements, but there are great limitations in the control function. By using this scheme instead of the above scheme, the process parameters such as current and voltage of the feed switch can be measured on-line. The cost of the customers is reduced, the stability of the technological conditions is ensured, and the response speed of the products is improved. Using text display screen, using the alarm information reflected by the display screen, the staff can easily troubleshoot the fault. The production efficiency is improved.


6. system highlights

The three-phase AC and leakage monitoring module UN 231-0BH22-0XA0 used in the system is a bright spot. The module can collect AC information through AC transformer, and cooperate with CPU operation and control, can realize the functions of over-voltage, under-voltage, overload, short circuit, leakage, three-phase unbalance protection and so on. Insulation resistance monitoring; zero sequence voltage and zero sequence current acquisition function. The product is an extension module of UN200PLC.


The module can also be applied to a variety of power supply monitoring and control products, such as various electrical control distribution system monitoring, small substation monitoring system and other combination switches.


3.Applications effect analysis

This control system achieves the anticipated goal in the feeder switch system. According to the importance of feeder switch system in practice, the UN200 series PLC and three-phase AC and leakage monitoring module of Shenzhen UniMATAutomation are selected. The stability of the system is improved, the response requirement of the system is reached, the wiring construction is simplified and the maintenance is reduced. Difficulty, because the series of PLC and Siemens S7-200 PLC are fully compatible, reducing the difficulty of engineer development, but also to a certain extent to save the cost of the system. The system is in good condition after being put into operation. It is also applied to monitor the power supply screen of several automatic control systems. It has a good application prospect in the industry.

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