SU1331834A1 - Installation for preparing to utilization of rolling-mill scale - Google Patents

Abstract

The invention relates to a technique for the treatment of sewage sludge from rolling mills of ferrous and non-ferrous metallurgy enterprises. The purpose of the invention is to increase the degree of capture of small scale. The installation contains a primary clarifier 1 with a grab 2 and a hopper. (B) 3 for descaling. Pos. By means of technological pipelines 4 and pump 5, the primary settling tank is connected to the secondary settling tank (BO) 6, which in turn, through pipe 7 to pump 8, is connected to cooling unit 9 and rolling mill units. The installation is equipped with a thickener 13 installed between the hopper 3 and BO 6, and the fine scale feed system is designed as a pressure distribution device (U) 16 installed in the lower part B 3. In the bunker, the wall opposite U 16 is equipped with a filter an element made in the form of a box 17 with inlet and outlet openings equipped with nets, the space between which is filled with a filtering load. The filter element is removable. The system allows purification of water contaminated with scale and oils. In this case, small particles of scale 0.03–0.06 mm in size are caught, and the pressure displacement of coarse and fine scale creates conditions for the accelerated dewatering of the mixture to a moisture content of 3-5% and the oil content in the mixture is 0.8-1.3%. 2 hp f-ly, 2 ill. 2 (L co oo 00 oo NU

Description

one

This invention relates to a technique for treating sewage sludge from rolling mills and can be used on. enterprises of ferrous and nonferrous metallurgy.

The aim of the invention is to increase the degree of capture of small-sized crystals.

Figure 1 is a reflection of the proposed installation; figure 2 - node 1 in Fig, 1.

The installation consists of a primary clarifier 1 with a grab 2 and a hopper: for descaling the scale. The primary settling tank 1 is connected to the secondary settling tank 6 by means of process piping 4 and pump-5. Another group of process piping 7 and pump 8 connects the secondary settling tank 6 to the cooling unit 9 from which the pipeline 10 is connected to rolling mill units. The rolling mill units are connected to the primary settling tank by the downstream channel 11. The secondary settling tank 6 is technologically connected to the thickener 13 via pipe 12, which, in turn, is connected to the pressure distribution device 16 located in the receiving section through pipe 14 and 15. parts of the hopper 3, for example, below the scale layer.

The filter element is located in the lower part of the bunker outlet in one of the side walls and is made in the form of a removable filter element consisting of a duct 17 equipped with nets and containing a coarse-grained load 18.

The filter element is equipped with a nozzle 19 installed on the side of the primary clarifier 1 and connected to the high pressure pipeline 20.

The installation works as follows.

Water contaminated by scale on the rolling mill aggregates, through feed channel 11 enters the primary settling tank 1, where it is freed from particles 0.06–40 mm in size, and then pump 5 through technological pipelines 4 to the secondary storage tank 6, where is cleaned from small particles of scale 0.03-0.06 mm in size, and the pump 8 through technological pipelines 7 is fed to the node 9 and is cooled

day, and from it to the rolling mill units by pipeline 10.

A coarse scale retained in the primary clarifier 1, a grab 2 is dumped into the bunker 3, where it is dehydrated. A fine scale, retained in the secondary settling tank 6, is supplied through conduit 12 to thickener 13, and from there pump 15 via conduit 14 to hopper 3. Water is fed into the hopper under pressure through a pressure distributor 16, installed,

for example, in the lower receiving part

bunker. When this occurs, the process of pressure filtration of watering scale through a large scale. This is facilitated by the formation of a zone of intensive mixing of coarse and fine scale in the area of the distribution device. The pressure mixture of coarse and fine scale creates conditions for the accelerated mixing of the mixture (humidity

a mixture of 3-5%, the oil content in a mixture of 0.8-1.3%),

Coarse dross, adsorbing fine dross and oil on its surface, allows excess moisture,

passing through the loading layer, through the filter element, look for from the box 17, equipped with nets and filled with coarse loading, to be removed from the bunker and drain into the primary clarifier 1.

It should be noted that in the process of feeding the slurry pulp, part of it is filtered in the vertical direction under the action of the pressure. In this case, a layer of filtered water is observed above the coarse scale, which creates an additional pressure of the liquid column. In this case, the design of the filter element eliminates the removal of large scale from the bunker and the overshoot of suspended solids in the filtrate.

The filter element is washed through the high-pressure pipe 20 and the pipe 19 with water or an air-water mixture.

From the hopper 3, the mixture of coarse or fine scale is removed with the help of a grapple 2 and transported to the preparation facilities of the steelmaking units. As the hopper 3 is emptied, it will be replenished with large scale from the primary clarifier.

The advantage of the proposed installation is that it is equipped with a pressure distribution system that allows you to use the entire volume of large scale, located in the bunker, as a filter element, to significantly increase the filtration rate and, accordingly, the capacity of the installation.

The connection of the pressure distribution system through a pipeline with a thickener installed after the radial sump, and its connection with the distribution device allows you to quickly affect the performance of the installation, since it is possible to control the degree of thickening of the slurry pulp removed from. radial sumps, over a wide range.

Claims (3)

1. Installation to prepare for the utilization of mill mill scale, LASH --- iFv § 0 five five 0 Holding a primary settling tank with a grab, a bunker and a fine scale feeding system, a secondary settling tank, a cooling unit, process piping and pumps, characterized in that, in order to increase the small scale capture, a thickener installed between the secondary clarifier and the bunker from the walls of which in the lower part it is equipped with a filtering element, while the fine scale feed system is made in the form of a porn switchgear located in the receiving part of the bunker wall, the underlying filter element 2. Installation pop. 1, characterized in that the filter element is made in the form of a box equipped with nets. 3. Installation according to claims 1 and 2, characterized in that the filter element is removable. o o- ooooo 00 „-“ and Ooo °, pbJ S-00 ° o ° o "oo o o" oo oo-ogqoo ° „0 ° OOOo ° S 2 Compiled by T. Ledneva Editor O. Yurkovetska Tehred V. Kadar Proofreader L. Patay Order 3763/20 Circulation 850 Subscription INSIGHTS of the USSR State Committee for inventions and discoveries 113035, Moscow F-35, Raushsk nab., 4/5. Production and printing company, Uzhgorod, Projecto st., 4