CN113546766A

CN113546766A - Anti-reverse-suction control method for oversized flotation machine

Info

Publication number: CN113546766A
Application number: CN202110854620.1A
Authority: CN
Inventors: 周金华; 乔艮牛; 安延辉
Original assignee: Tisco Lanxian Mining Co ltd; Taiyuan Iron and Steel Group Co Ltd
Current assignee: Tisco Lanxian Mining Co ltd; Taiyuan Iron and Steel Group Co Ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2021-10-26

Abstract

A control method for preventing ore back suction of an oversized flotation machine is applied to industries of black, nonferrous and rare metals, oxidized minerals, coal and graphite, and comprises the following contents: (1) a check valve is additionally arranged on a hollow shaft for inflating the flotation machine, when the wind pressure is more than 4psi, the check valve is opened to supply air, and when the wind pressure is less than 4psi, the check valve is closed; (2) setting data of starting and stopping the flotation machine, and starting the flotation machine after 5 seconds when the opening of the inflation control butterfly valve is not less than 5% of an opening value; when the opening of the air inflation control butterfly valve is smaller than a set value, the flotation machine is prohibited to start; if the flotation machine is in the running state, the flotation machine is automatically stopped, the machine is automatically stopped in an interlocking manner and gives an alarm, and the upper computer gives an alarm sound. The invention effectively improves the grade of minerals and the recovery rate of metals, and reduces the equipment failure, the spare part consumption of the equipment and the labor intensity of staff maintenance.

Description

Anti-reverse-suction control method for oversized flotation machine

Technical Field

The invention relates to a technology for preventing reverse suction of a metallurgical mine flotation machine and controlling, which can be widely applied to industries such as black, non-ferrous and rare metals, oxidized minerals, coal, graphite and the like, and can be applied to the fields of environmental protection, chemical industry, food, materials, medicines, biology and the like.

Background

The iron ores of the metallurgical mines contain more than two kinds of iron minerals, so that the ore dressing process is complex and the selectivity is poor. When weak magnetic ores such as siderite, hematite, goethite, limonite, specularite and the like coexist in iron ore, because of the difference of physicochemical properties and disseminated particle sizes of different iron minerals, gangue minerals are relatively complex and have high Si content, the gangue minerals belong to refractory ores, and in order to obtain concentrate products with high grade and high recovery rate, a flotation process needs to be added in the process of ore dressing production technology. The flotation method is a widely used beneficiation method in beneficiation processes, and is a method for separating ores by utilizing the difference of the physicochemical properties of the surfaces of the ores. If the design capability of the mining company Limited lanxian county of Taigang group is as follows: the scale of raw ore is 2200 ten thousand t/year, the total amount of mining and stripping is 8580 ten thousand t/year, and iron concentrate powder is produced every year by 741 ten thousand t. Through a coarse-fine-three-sweep reverse flotation process flow, four agents of a collecting agent, NaOH, corn starch and CaO are added in the process links to carry out flotation on the ores from the previous process, and finally iron concentrate powder with concentrate grade TFe being more than or equal to 65% is produced.

Mineral separation anion reverse flotation of Tailang lan county mineral industry Limited is a main production process link, and the normal operation of a 160m3 Dalton flotation machine as main equipment of the mineral separation anion reverse flotation machine is directly related to the stable operation, the improvement of metal recovery rate, the desilicication effect and the output of qualified iron ore concentrate powder of Tailang county mineral industry Limited.

A160 m3 Dalton flotation machine is used as main equipment of the mineral separation flotation production process, the production technology process mainly comprises the steps of introducing air to generate bubbles with proper size, enough quantity and proper stability, dispersing the bubbles in ore pulp, moving the bubbles with certain kinetic energy, colliding with reagents and ore particles to generate selective adhesion, realizing mineralization and good separation effect, and achieving the purposes of improving metal recovery rate and good desiliconization effect, but when an air supply source of the bubbles is suddenly cut off or the air supply source equipment suddenly stops and the air pressure in the operation process is too low, a hollow shaft at the core part of the bubbles can form negative pressure, the ore pulp enters a bearing chamber of a Dalton flotation shaft box assembly from a rotor along the hollow shaft to cause bearing ore feeding, the bearing generates heat in the early stage, the bearing temperature rises sharply and generates abnormal sound, finally the Dalton flotation shaft assembly bearing is scrapped due to ore feeding abrasion, before improvement, the operation rate of the Dalton flotation machine is only 78.8%, finally, the scavenging flotation time is short, the percent of pass is averagely 24.28% when the tailings are less than 19%, the metal recovery rate is only 74.70%, the tailings grade is 20.97%, and the concentrate grade is 65.22%.

160m of mining company Limited in Tailang lan county³A production technology process of a Dalton flotation machine mainly comprises the steps of introducing air to generate bubbles with proper size, enough quantity and proper stability, dispersing the bubbles in ore pulp, moves with certain kinetic energy and collides with the medicament and ore particles to generate selective adhesion, realizes mineralization and good separation effect, when the air supply source of the device is suddenly cut off or the air supply source equipment suddenly jumps and stops and the air pressure is too low in the operation process, a hollow shaft at the core part of the device can form negative pressure, ore pulp enters a bearing chamber of a Dalton flotation shaft box assembly from a rotor along the hollow shaft, so that the bearings enter ores, the bearings generate heat in the early stage, the temperature of the bearings rises violently and abnormal sounds occur in the later stage, finally the bearings of the Dalton flotation shaft assembly are scrapped due to the abrasion of the entering ores, 56 flotation shaft assemblies which are scrapped due to the previous entering ores are replaced together, and the spare part cost is 849.52 ten thousand yuan; and the adjustment of the on-site production process indexes is directly influenced, so that various indexes are disordered, and the stable operation of the whole flotation system process is influenced. The phenomenon not only influences the reduction of the aeration quantity of the Dalton flotation machine to cause the deterioration of the process effect of the scavenging flotation machine, but also reduces the bearing of the Dalton flotation machine along with the abrasion service life of the bearing to increase the spare part cost, and before the improvement, the operation rate of the Dalton flotation machine is only 78.8 percent, and finally, the scavenging flotation time is short, and tailings are generated<The percent of pass in 19 percent hours is 24.28 percent averagely, the metal recovery rate is only 74.70 percent, the tailing grade is 20.97 percent, and the concentrate grade is 65.22 percent.

Disclosure of Invention

The invention aims to improve the metal recovery rate, continuously and stably output qualified iron ore concentrate powder, eliminate the phenomenon that an air supply control device of a flotation machine is suddenly closed or air supply equipment suddenly stops and the air pressure in the operation process is too small, negative pressure is generated in a hollow shaft of the flotation machine, ore pulp enters a flotation machine shaft assembly from a rotor along the hollow shaft, so that a bearing enters an ore, the bearing generates heat in the early stage, the temperature of the bearing rises violently in the later stage and abnormal sound occurs, and finally the bearing of the flotation machine shaft assembly is worn and scrapped due to ore entering, so that the fault is increased, the operation rate of the flotation machine is influenced, and the flotation process flow is disordered.

The invention adopts Siemens PLC.

An anti-reverse-suction control method for an oversized flotation machine comprises the following steps:

(1) a check valve is additionally arranged on a hollow shaft for inflating the flotation machine, when the wind pressure is greater than 4psi, the check valve is opened to supply gas, and when the wind pressure is lower than 4psi, the check valve is closed to prevent ore from being sucked back into a tao' er flotation machine assembly;

(2) setting data of starting and stopping the flotation machine, and starting the flotation machine after 5 seconds when the opening of the inflation control butterfly valve is not less than 5% of an opening value; when the opening of the inflation control butterfly valve is smaller than a set value (namely an opening value of 5%), the flotation machine is prohibited to be started; if the flotation machine is in the running state, the flotation machine is automatically stopped, the machine is automatically stopped in an interlocking manner and gives an alarm, and the upper computer gives an alarm sound.

The invention has the following beneficial effects:

1. the operation rate of the equipment is improved, the equipment is started and operated after implementation to realize interlocking protection intelligent control, the fault of the equipment is reduced, and the operation rate of the equipment is improved.

2. The concentrate stability rate of the target output product is improved, the equipment operates efficiently and stably after implementation, the requirements of the production process are met, the production process system operates continuously and stably, and the concentrate stability rate of the target output product is improved.

3. Cost reduction and efficiency improvement are realized, the service life of equipment is prolonged after implementation, the cost of equipment spare parts is reduced, and cost reduction and efficiency improvement are realized through equipment management.

4. The labor intensity of the staff is reduced, the service life of the equipment is prolonged after the implementation, the emergency repair is eliminated, and the labor intensity of the staff is reduced.

Detailed Description

Flotation of 160m by mineral separation department of mining Limited company in Tai-Gai Lang county³An inflatable flotation machine is taken as an example.

(1) And a gas flowmeter on the inflation pipeline is debugged, so that the accuracy of the acquired data is ensured.

(2) The data of the gas flow meter is led to the CPU of the main control system of the flotation three series.

(3) In the winc software of the upper computer, a control program is programmed, so that the effects that the vehicle cannot be started when the opening of the inflation control butterfly valve is smaller than a set value (5% opening) before starting, and the vehicle stops when the opening of the inflation control butterfly valve is smaller than a set value (5% opening) in the operation process are achieved.

(4) Making an upper computer picture: setting air quantity comparison parameters for adjusting the air quantity to be compared to be changed along with the change of process requirements; the interlock is put into use and is selected and the amount of wind sets up and is equipped with the password authority.

(5) And a sound alarm is made to achieve the purpose of timely reminding.

(6) A check valve is additionally arranged on a hollow shaft for inflating the core part of the flotation machine, and the operation is eliminated and the stopped ore pulp enters a bearing chamber of the flotation machine through physical isolation blocking.

The check valve is opened to supply air when the wind pressure is greater than 4psi (equivalent to 5% opening of the control butterfly valve at best), and is closed when the wind pressure is lower than 4psi (equivalent to 5% opening of the control butterfly valve at best), so that the ore is prevented from being sucked back and entering the flotation machine assembly.

All relevant equipment facilities and power medium sources on the site are confirmed to be correct, and the centralized control remote starting equipment is fed back to ensure the normal operation of the field equipment and meet the operation requirement of the production process.

Claims

1. An anti-reverse-suction control method of an oversized flotation machine is characterized by comprising the following steps:

(1) a check valve is additionally arranged on a hollow shaft for inflating the flotation machine, when the wind pressure is greater than 4psi, the check valve is opened to supply gas, and when the wind pressure is lower than 4psi, the check valve is closed;

(2) setting data of starting and stopping the flotation machine, namely starting the flotation machine after 5 seconds when the opening of a butterfly valve controlled by the aeration quantity of the flotation machine is not less than an opening value of 5 percent; when the opening of the butterfly valve for controlling the aeration quantity of the flotation machine is smaller than the opening value of 5% of the set value, the flotation machine is forbidden to be started, at the moment, if the flotation machine is in the running state, the flotation machine is automatically stopped, meanwhile, the machine is automatically interlocked to stop and alarm, and the upper computer gives out sound alarm.