SU778739A1 - Method of separating supplementary products and waste of metallurgical industry - Google Patents

Description

(54) METHOD FOR SEPARATING SIDE PRODUCTS

AND WASTE METALLURGICAL. INDUSTRY The invention relates to the metallurgical industry and can be used to clean contaminated mechanical materials, for separation into water, oil, and mill scale or thickened pulp from metal processing and metal processing plants. A known method of separating the by-products and wastes of the metallurgical industry, consisting of water, oil and mechanical impurities, by settling without forced heating. The swollen oil and the settled sediment on the bottom are removed. However, this method is effective for systems containing large and medium sized scale. Systems consisting of water, oil, and fine scale without forced heating are not well separated, and the quality indicators of the target products are low. A known method of separating sludge or condensed pulp by thermally treating them at 800-850 ° C in a rotary kiln. The method allows obtaining 18-atmospheric steam in the recovery boiler and preparing scale for its further processing. 2. The disadvantages of the method are the burning out of expensive oils and the formation of a large amount of contaminated waste gases. The closest to the proposed method is the separation of by-products and wastes of the metallurgical industry by heat treatment, including heating and separation of the mixture into individual components, mainly by distillation, and water is released at 80-97 ° C under stirring conditions for 24-48 hours. The oil and water separated by thermal curing are separated from the lower layer enriched in solid product 3. However, the separation of heterogeneous mixtures containing oil, water and metal oxides, for example scale. It occurs with low efficiency and low yield oil. The degree of extraction of oil does not exceed 40%. The quality indicators of the products obtained are unsatisfactory. The oil contains at least 0.2% of mechanical impurities, which narrows the scope of its repeated use. High residual oil in the scale (10-14% of dry weight) makes it difficult to utilize it at sinter plants, in order to reduce productivity of sintering oil and deteriorate working conditions. The purpose of the invention is to increase the separation efficiency of heterogeneous mixtures containing metal oxides, such as scale , improving the quality of the target products and ensuring their 1st level of use. This goal is achieved by separating by-products and wastes of the metallurgical industry, for example, oil waste and sludge or thickened pulp containing water, oil and solid product, after separating water, vacuum oil is distilled and vacuum dried from oil of solid residue at temperatures not higher than 400 ° s The method of separation of by-products and metallurgical industry wastes containing water, oil and solid product can be used for mixtures containing,% s water 0-80, oil 5-98, slag 0.2 to 95. Oil waste, sludge or condensed the pulp is heated at atmospheric pressure to 100 ° C and 80-85% of water is separated by simple distillation. Next, the product is dried against residual moisture at 120 ° C and atmospheric pressure. After water is separated from the remaining product by vacuum distillation to a temperature equal to the final boiling point of the oil (300-350 ° C), 80-85% of the oil is separated. Next, the remaining pasty product is vacuum dried from the remaining oil at a temperature above the boiling point of the oil by 30-50 ° C, but no more. Vacuum distillation and vacuum drying is carried out at the end of the temperature limit: it does not exceed 30 mmHg. The bottom residue (scale) is discharged after cooling and pressure equalization in the system with air pressure. The degree of oil recovery is 94%, the residual content of organic compounds in the scale does not exceed 3%, the content of mechanical impurities in the oil is reduced to 0.01%. The sequence of operations, the use of vacuum and a certain experimental temperature ry; the press allows to separate the by-products and wastes of the metallurgical industry, consisting of water, oil and metal oxides, for example, scale into individual components with high selectivity and to obtain the target products with good quality indicators. mi Primer p. The slurry from the country 2000 containing thickener,%: water 26.4, oil 23.0 and dross 50.6, is loaded into a flask in an amount of 966.4 t (100%) is heated at atmospheric pressure to 100 ° C and held until the intense release of water vapor. The latter are condensed and collected in a receiver. During distillation, 204.2 g (21.1%) of water is released. Next, the temperature in the flask is raised to 12 OC and the product is kept until the evolution of water is completely stopped. In this case, 51.0 g (5.3%) of water reappears. The total water yield is 255.2 g (26.4%). Further, a residual pressure of 5.0 mm Hg is created in the system. Art. and raise the temperature to. The resulting oil vapor is condensed in a condenser and collected in a receiver. Next, the temperature in the flask is raised to the value of FBS and the product is kept until the release of oil is completely stopped. In the process of vacuum distillation, 177.8 g (18.4%) of oil is obtained, in the process of vacuum drying of the bottom residue, 29.6 g (3.1%) of oil is isolated. The total oil yield is 207.4 g (21.5% -). The residual (scale) remaining in the flask is cooled, pressure is compared with atmospheric and discharged. Its yield is 502 g (51.8%). The main process indicators in comparison with the well-known method are given in the table.

The degree of extraction of oil,% 40

Organic Content

B gK3JiHHejj. ..., P-.94

one

Characteristic

oils

viscosity at, cSt

content of mechanical impurities,%

flash point in open crucible, with

f

Viscosity and flash point of fresh

Claims (2)

industrial oil I-ZOA. As can be seen from the table, the use of the proposed method for separating by-products and wastes of the metallurgical industry provides, in comparison with known methods, an increase in the degree of oil recovery from 40 to 94%, a decrease in the oil content in scale from 10-14 to 2.3, an increase in oil quality by reducing the amount of mechanical impurities in it from 0.2 to 0.01%. In addition, the qualified use of waste sludge prevents pollution of water basins and the environment. The invention of the method of separation of by-products and wastes of the metallurgical industry, for example oil wastes of ashams or thickened pulp containing water, oil and solid product including heating and separation of mixtures Table continuation thirty thirty 0,007 0.2 190 188 si to individual components, mainly by distillation with water, characterized in that, in order to improve the separation efficiency of heterogeneous mixtures containing metal oxides, for example, scale, improve the quality of the target products and ensure their reuse, after water is evolved, vacuum distillation is carried out oils and vacuum drying from the oil of the solid residue at temperatures not higher. Sources of information taken 60 attention in the examination 1. Shabalin A. F. Wastewater treatment of ferrous metallurgy enterprises. Metallurgizdat, 1960, p. 60. 2. Installation for thermal, waste disposal. Design considerations. Appendix 1. Arch. No. L-60864, VNIPICHEO, Kharkiv, 1978. 3. Installation for partial deoiling of sediment Appendix 2. Arch. No. 60801. VNIPICHEO, Kharkov, 1977.