RU1784606C - Mixture for producing refractory lining - Google Patents

Abstract

SUMMARY OF THE INVENTION: a mass for making a lining contains 5-7% water; coal enrichment waste 15–40%, waste solution of alkaline cleaning of castings 1–3%, alumina chloride waste of washing the alkylate, the product of the interaction of benzene and ethylene from the catalyst, 2–4% and silica filler - the rest. Liquid waste is added to the pre-mixed solid components, mixed, the mass is compacted, and the resulting lining is dried. Mass characteristics: strength 5.97-8.03 MPa: porosity 22.7-27.3%, density 1.83-1.88 kg / m3; thermo - resistance 23-29 swimming trunks. 2 tab.

Description

The invention relates to the composition of the masses that may find application in the production of linings for thermal metallurgical units.

A known mass for the manufacture of lining, including silica sand, water and binders in the form of refractory clay and water glass (or borax).

The disadvantages of the known mass is its low mechanical strength, high porosity, and, as a result, reduced durability, leading to a limitation of the technical service of the lining,

A known mass for the manufacture of a lining comprising silica sand, water and refractory clay and phosphoric acid as binders.

The known mass has low mechanical strength, increased porosity and low heat resistance, leading to frequent mechanical damage to the lining and to a decrease in its operational properties.

The aim of the invention is to increase the strength and heat resistance and reduce the porosity of the lining.

The goal is achieved in that the mass for the manufacture of the lining, including siliceous filler and water, additionally contains coal treatment waste, an spent solution of alkaline cleaning of castings and aluminum chloride wash of alkIlate, a product of the interaction of benzene and ethylene from a catalyst in the following ratio of ingredients, wt.%:

Water5-7

Coal preparation waste 15-40 Waste solution of alkaline cleaning of castings 1-3 Indicated waste

cl

with

h with

4

smiling about

flushing 2-4

Siliceous

filler

Example. Used in the composition

refractory coal treatment waste

contain carbon C 10-15 wt.%, oxide

silicon SiO 45-55%, alumina

May 20-30. %, magnesium oxides, MgO and calcium

 CaO 6-8 wt.%, Unidentified elements

4-7 wt.%.

The waste of washing the alkylate from the catalyst - the waste of alkylation, is a 25-27% aqueous solution of AICI aluminum chloride with a density of 1.2-1.35 g / cm and is formed at the stage of washing the alkylate of the product of exposure to benzene and ethylene, from the catalyst - ALC. 30-32 kg per ton of ethylbenzene are released.

The alkaline cleaning waste of the castings is a waste aqueous solution containing sodium hydroxide MaOH and sodium silicate in a ratio of 1: 0.8-1.4.

As siliceous filler, quartz sand of grade 2 K016 and sands with similar properties are used.

The refractory mass is prepared in runners by mixing the siliceous filler with coal treatment waste, and then an aqueous solution of the alkylation waste and alkaline cleaning of the castings is added to the resulting mixture. The mixing cycle for all components is 6-10 minutes. Then, as usual, the finished refractory mass is poured between the template and the reinforcing layer of the casting bucket, while the wire is sealed with a pneumatic ram. After compacting the mass and removing the template, the fabricated lining is dried using a gas burner for 1 hour. The temperature on the surface of the working layer does not exceed 250-300 ° C, and the temperature of the bucket casing is 60-70 ° at the end of the cycle from the pulley. To receive molten metal, the dried ladle is heated with a gas burner to the surface temperature of the working layer of the lining 700-800 ° C.

The compositions of the masses are given in table 1, and their properties are shown in table 2.

When the silica filler is mixed together, the waste in coal preparation and aqueous solutions of alkylation wastes and alkaline cleaning of the castings, a refractory mass with improved quality characteristics (resistance, mechanical strength) is formed. Improving the quality of the lining made from the mass is achieved by forming, during mixing and the course of the chemical reaction between the wastes of alkylation and alkaline cleaning, finely dispersed ash castings having improved binding properties that increase the mechanical strength of the lining and at the same time reduce the porosity and increase its durability. In known voltages, alkaline waste from casting refining is used as an activator for hardening masses based on

metallurgical slag, which has a low refractoriness of 1200-1400 ° C and therefore cannot be used to produce refractory masses for liquid metal spill conditions.

Coal wastes have insufficient binder properties. Therefore, refractory masses based only on coal processing waste have low mechanical strength, and the lining has a short service life.

In the described mass, a finely dispersed sol, which is the product of the reaction between the waste of alkaline cleaning of castings and alkylation, is used to increase the binder effect of coal processing waste. In addition, fine particles of ash reduce the porosity of the lining and, as a result, its erosion by liquid metal and slag, thereby increasing

most durability of the lining. The refractoriness of the forming ash is 1680-1730 ° C. which corresponds to the refractoriness of the main material of the lining.

The selected ratios of the components provide a sufficiently high quality lining due to the occurrence of chemical processes during the mixing of the components.

As can be seen from table 2, the proposed

refractory mass has higher performance properties compared to known ones. The maximum lining resistance - 29 heats - is achieved when the content in the mass of 44.9 wt.%,

binder additives (of which 40% by weight is coal waste). With such a content, the maximum strength is achieved after drying the lining at a temperature of 1100 ° C (8.03 MPa) and the minimum

porosity (22.7%).

Claims (1)

The claims The mass for the preparation of the lining, including a siliceous filler and water, characterized in that, in order to increase strength, heat resistance and reduce porosity, it additionally contains coal treatment waste, spent solution alkaline cleaning castings and aluminochloride waste of washing the alkylate - the product of exposure to benzene and ethylene from the catalyst in the following ratio of components, wt.%: Water 5-7 Coal preparation waste 15-40 Waste solution of alkaline cleaning of castings Indicated washing waste Siliceous filler Continuation of the table. t table 2