Circulating water system in iron ore concentrate dehydrating process
The invention provides a circulating water system which is capable of automatically keeping a water level within a rational range. The circulating water system comprises two gravity filters, a circulating water pool and a backwash water pool, wherein the gravity filters are used for purifying sewage in an iron ore concentrate dehydrating process; the purified water outlet of the gravity filter is connected to the circulating water pool through a first pipeline; the backwash water pool is connected to the circulating water pool through a second pipeline. The circulating water system provided by the invention has the characteristics that the pipeline connection manner of the backwash water pool is changed and a ball float valve is innovatively introduced so that the water level in the backwash water pool can be kept in a predetermined range, therefore, the problem that water is completely pumped out or overflows in each water pool due to the change of the amount of water for production is effectively solved. 1. A kind of iron ore concentrate the circulating water system of the dehydration process, including the gravity filter (1), circulating water pool (5) and back water pool (6), the filter states the gravity type (1) used for the iron ore concentrate dewatering technique of treating sewage by purification, characterized in that the filter states the gravity type (1) through the 1st pipeline export of purified water (2) is connected to the circulation tank (5), the recoil water pool (6) through the 2nd pipe (9) is connected to the circulation tank (5). 2. Circulating water system according to Claim 1, characterized in that wherein the 2nd pipe (9) is connected with the recoil-water pool (6) is the water outlet end of the recoil for ensuring that the water level in the water tank of a float valve (7). 3. Circulating water system according to Claim 2, characterized in that the floating ball valve (7) based on recoil pool in the actual water level height of the water level height and the pre-control of the 2nd pipeline (9) of the on-off, when the actual water level height of the water level is lower than the preset height of the floating ball valve (7) is in the open state, when the actual water level when the preset water level height higher than the height of the floating ball valve (7) is in a closed state. 4. Circulating water system according to Claim 3, characterized in that the pre-set water level height of the recoil-water pool (6) four-fifths of the overall height, the floating ball valve (7) for the plastic floats ball valve. 5. Circulating water system according to Claim 2, characterized in that wherein the 2nd pipe (9) is connected to the circulation tank (5) at the bottom or the side wall of the circulation tank (5) of the bottom surface. 6. Any one of the water circulating system according to Claim 1-5, characterized in that wherein the further in the 1st pipeline (2) is provided with a 1st control valve (8), in the 2nd pipe (9) is provided with a 2nd control valve (10). 7. Circulating water system according to Claim 6, characterized in that wherein the pipeline 2nd (9) is connected with the circulating water tank is arranged near one end of the 2nd control valve (10). 8. Circulating water system according to Claim 6, characterized in that wherein the 1st control valve (8) and 2nd control valve (10) as the cutoff valve is in the normally open state. 9. According to Claim 1-5, 7-8 to any one of the water circulating system, characterized in that wherein the recoil-water pool (6) is lower than the height of the geographic location of the circulation tank (5).