Технические науки/1. Металлургия

¹PhD student Assanov D.A., ¹k.t.s. Zapasny V.V., ²Zapasny E.V., ¹student Makeyeva A.M.

¹D. Serikbayev East Kazakhstan state technical university, Kazakhstan, ²«Belocerkovskaja HPP» CJSC, Ukraine

IMPROVING OF VENTILATION SYSTEMS EFFICIENCY IN ELECTROLYTE SHOP OF RIDDER METALLURGICAL COMPLEX «KAZZINC»

Ridder metallurgical complex «Kazzinc» is the town-forming enterprise of mining industry, which includes mines, concentrators, lead and zinc plants.

Ridder metallurgical complex «Kazzinc» is the town-forming enterprise of mining industry, which includes mines, concentrators, lead and zinc plants. The zinc cinder is being cleared, processed to solution and then leached in tank room [1] with the resulting formation of following final products:: zinc metal stamps CV, UMC Contact, ISO 752; zinc alloys; zinc dross; Zinc powder for use in separation processes classification zinc calcine; the spent zinc electrolyte for use in branch classification zinc calcine and hydrometallurgical shop.

The significant emission of electrolyte aerosols was diagnosed in production area of tank shop with a consequent sanitize substandard. The main reasons are high temperature of electrolyte solutions and inefficient work of exhaust systems/ aspiration and insufficient air supply as well [2]. Tank shop space is 93,600 m³.

Aspiration system of agitators and thickeners have a natural air extraction through pipes with a diameter of 0.4 m, which is insufficient. The electrolyte transmissions from zinc cinder shop to tank shop by two feeds located in the vacuum evaporative separation gallery. In winter, there is an increase of water yielding capacity in the gallery because of additional temperature difference (electrolyte temperature of 50 ÷ 60 ⁰C, the air temperature in the gallery of 10 ÷ 15 ⁰C).

In a dross shop, the group cyclone CN-15-400 cleans dusty gases that discharged by equipment. The emission of dust-laden air occurs to shop/plant site while dross is being loaded into bunker because of inefficient local exhaust and fine dust cyclones. Recommendations:

1. to perform the following activities in the building of the electrolysis shop:

- To shift air-tubes position down in a distance of no more than two meters from the floor line inside of the system of local ventilation in strip zinc workplaces (according to the requirements - not to hinder the work of the operator).

- To set sideboards that provide a stable slot to workplaces of width 5-7 cm. Distribution of fresh air to passages located between electrolysis baths is produced by collectors length of 26 m with dispenser windows of 400 × 100 mm. Collectors are located under the floor passes.

Air, due to lack of size slots limiter, is not distributed evenly.

- To install fans VO6-300 № 6,3 with capacity 9000-13000 m³/h in location of top windows line. Aeration lanterns in the electrolysis shop does not provide a stable removal of contaminated air from the upper zone of the shop in respond to meteorological conditions.

2. To double the steam remove from thickeners, agitators in electrolyte and hydrometallurgical shops. In case of high temperature leaching it’s needed to triple the steam remove. This can be achieved by combination of mechanical exhaust aspirationand existing natural ventilation. The ejectors [3] should be installed in existing duct system with increase of exhaust air in 2 - 3 times.

3. To change the design of suction aspiration and apply the bag filter instead of cyclone to reduce particulate air pollution in the working area of dross shop.

4. The gallery vacuum evaporation compartment to avoid intensive evaporation of moisture held in the vestibule area plum pulp chute and made removable cover their entire length.

5. In the vacuum evaporation department should:

- The room location gutters electrolyte transport (elev. 7.2) to increase the gutter board 0.5 m and make him suction side. Removal of aerosols electrolyte done using ducts and radial fan type TS4-70 № 6,3 window. The same system to connect the general exchange exhaust ventilation duct in the form of windows with foster cross-section 0.2 x 0.2 m attached to the columns of 6 m. This quantity of exhaust air will provide air exchange in the room up to 9 times/h.

- To connect Pachuca air vent to general mechanical ventilation system. There is a natural containers aspiration in Pachuca space that is used for dissolving of bone glue in the hot water. However, it is not enough to provide the atmospheric conditions.

- To install a mechanical exhaust ventilation with overall performance for the two tanks of 7-8 thousand m³/h and for the last tank and of 3-4 thousand m³/h. To remove steam emissions through windows. There are periodical difficult working conditions due to significant evaporation of the electrolyte from three hot tanks located in a shop (7.2). Implementation of the recommendations, will improve the sanitary condition of the air in the workplace. The results can be used in the design of ventilation systems and aspiration in non-ferrous metallurgy.

The implementation of the proposed recommendations will improve the sanitary condition of the air in workplaces. The results can be used in the design of ventilation systems and aspiration in non-ferrous metallurgy.

References:

1. Asanov D.A., Zapasnyj V.V., Ermekova A.T. Modernizacija sistem ochistki tehnologicheskih i ventiljacionnyh gazov Ridderskogo metallurgicheskogo kompleksa TOO «Kazcink» // Metallurg. 2013. # 8. S. 20–25.

2. V.A. Anan'ev, L.N. Balueva, A.D. Gal'perin, A.K. Gorodov, M.Ju. Eremin, S.M. Zvjaginceva, V.P. Murashko, I.V. Sedyh. Sistemy ventiljacii i kondicionirovanija. Teorija i praktika. 3-e izdanie. M.: Evroklimat, 2001 g. – 416 s.

3. G.M. Gordon, I.L. Pejsahov. Pyleulavlivanie i ochistka gazov v cvetnoj metallurgii. 3-e izdanie, pererabotannoe i dopolnennoe. – M.: «Metallurgija», 1977 g. – 456 s.