Common problems on limestone wet ball mill running
Date：2015-03-01 01:53:35 ?? Source：Clirik
Limestone wet
ball mill is limestone - gypsum wet FGD system pulping equipment, here we do a detailed analysis of limestone wet ball mill running questions.
A limestone ball mill working principle and structural characteristics
Limestone wet ball mill can be continuous or discontinuous operation. Limestone belt conveyor to the mill by weighing, process water (for precipitation consumption, reduce desulfurization drainage, using gypsum dewatering filtrate water after the water as the pulp) and flow through a pipe from the bottom of the limestone entrance to the mill after the separation cyclone, raw ball milled transferred by gravity into the interior of the system a slurry recirculation tank, the slurry through the slurry from the slurry pumped into the cyclone circulation tank, and then through the cyclone underflow and overflow separated. Structure and working principle of a wet ball mill with the same ordinary ball mill, but of carrying the medium is water, so the composition and operation of the system has two distinct characteristics; First by recirculation tank, recirculating pump and constitute a two-stage cyclone separation system to adjust the fineness of the product slurry has a concentration of solid particles; the second is the system of all, tanks, pumps, piping, agitators are lined with rubber or use protective anti-corrosion materials, pipe joints with mechanical plus sealing material.
Ball mill running problems and countermeasures
1, the mill output and easy enough to throw stones, not only increases the power consumption of ground limestone, and increasing the labor intensity, causes and countermeasures are as follows:
(1) Input limestone material diameter is too large (more than the original design value 20mm), resulting in ball and throw stones enough to contribute. Oversized limestone particles mill will bring additional burden, and large individual particles can not easily be crushed limestone ball, ball mill output will lead to reduced power consumption increases. The maximum size of the scene found that some limestone ≥60mm, in the new material being added to the absence of crushed stone will be thrown down the mill outlet. Therefore, in operation should be closely monitored feeder limestone particle size, particle size exceeding maximum design discovery should immediately reduce or stop feeding the feed and take appropriate measures to ensure the feed particle size qualified.
(2) Ball replenishment. Due to the long-running mill, ball severe wear, the diameter decreases, the impact force is correspondingly reduced. When the inner ball mill supplement is not timely, mill output is not enough. Therefore, in order to maintain a certain charge the ball and ball diameter coefficient, should the cumulative number of limestone grinding mill according to current and mill regularly add qualified ball into the mill.
(3) Adding a ball the size ratio is reasonable.
(4) Ball mill cylinder body armor breakage. Mill perfect armor, can increase the coefficient of friction ball and armor, help enhance the ball and limestone mill output can be improved, among badly worn armor, ball and armor have relatively large slide, there will be more energy consumption in the ball and armor friction, failed to enhance the ball, the ball mill output will be significantly decreased. When the ball mill armor damage or loss, the obvious place to hear a crash, this happens as soon as possible should outages ball handling damaged armor, armor ball to avoid extensive damage.
2, throw the ball mill outlet slurry
Mill normal operation, debris outlet pipe outflow slurry, and mixed with pebbles. Causes and Countermeasures follows:
(1) Water mill feed ratio imbalance. The amount of water flowing through the tube mill is running an important parameter, which reflects the size of the solid particles in the ball-carrying capacity. Therefore, the amount of water flowing through the tube mill and ball mill output should correspond to controlled within an appropriate range. Ball Mill flowing water by carrying water and cyclone underflow together to form the bottom of the cyclone in the amount of water under normal conditions is generally the same, but must ensure that the cyclone underflow settling mouth no wear, when cyclone underflow After settling nozzle wear, the cyclone itself working conditions have changed, resulting in increasing the amount of water cyclone underflow, overflow the top stream of water is reduced, resulting in an increase in the amount of water entering the mill. Therefore, the normal operation of the cyclone should be careful to check the wear mouth without settling, to ensure normal feeding water mill entrance.
(2) Selection and cleanliness of the outlet aperture sieve mill outlet. If the mill outlet filter pore size is too large, coarse material is not only easy to increase the pump and cyclone mill buckle workers, and even cause the pump jam; if the mill outlet filter pore size is too small, the filter is easy clogging, and cause rejection pulp mill outlet; if mill outlet filter aperture is too small, easy to plug the filter, and cause rejection pulp mill outlet. In addition, during normal operation, due to the higher concentration and limestone slurry contains some impurities such as wood chips, etc., will also appear mill outlet filter clogging, leading to the rejection of export pulp mill. Therefore, we should choose the right filter pore size, and keep the filter clean exit.
3) Easy to throw the ball mill outlet
Easily thrown the ball mill exports more reason for the high ball in the material level. Causes high ball inside the material level: First reduce the ratio of water so that the water carrying capacity decreased, resulting in the mill material level rise; the second is feed mill inlet diameter is too large, so that the material in the mill residence time resulting in an increase in the mill feed bit too high. Therefore, the operation of these two factors should be strictly controlled.
Wet ball mill is a new type of power plant equipment put into operation after wet FGD started, there are many places in the mining bosses troubleshooting and optimization aspects of operation of the equipment, we need more effort in future work.
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