Method of granulating solid waste synthesis organochlorosilanes

 

(57) Abstract:

The invention relates to chemical technology of organic silicon compounds, and in particular to methods of solid waste synthesis organochlorosilanes, which can be used, for example, in metallurgy. The technical objective of the proposed solutions is to obtain granules, the strength of which meets the requirements of metallurgical production. Method of granulating solid waste synthesis organochlorosilanes includes balling them under the influence of liquid agent on the basis of water, followed by drying and calcining the granules in the liquid agent is injected additive, which uses caustic soda and/or sodium silicate and/or calcium hydroxide, with the following ratio of components, wt.%: Supplement 5 - 40, water the rest; as a binder when washing, it is advisable to use bentonite, and/or lime and/or the mold, and/or dolomite flour, and/or clay, or mixtures thereof. 2 C. p. F.-ly.

The invention relates to the field of chemical technology organosilicon compounds, and in particular to methods of solid waste direct synthesis organochlorosilanes.

Use of the trademark passivemode is Metallurgie copper;

for reductive smelting of silicon with the addition of up to 20% PGCM in the main charge;

- metallurgical processing as a source of ferrosilicon, copper, etc.

Granulation is the process of formation of solid particles of a certain size, shape and the specified physico-chemical properties, accompanied by a seal structure of matter.

Modern methods of granulation (class P. C., Grishaev, I. basic techniques of granulation. - M.: Chemistry, 1982) provide a large number of products with improved physical properties: good flowability, high strength structures, homogeneity, particle size distribution, if the granulation is carried out from liquid phase from the gaseous phase from a mixture of liquid and gaseous phases.

According to the patent and technical literature, domestic and foreign practice for granulating powders are mainly used methods using various humectants, binders with simultaneous mechanical influence on the mass (pressing, crushing, Okada, rolling through the rolls, etc.) with subsequent drying of the granular mass from the humidifier.

Currently n is 852875, 07.04.81) and sent to the dump, which causes significant harm to the environment. In addition, irretrievably lost an expensive metal is copper.

Previously for the disposal of ACM have been proposed methods of regeneration and recycling ACM (U.S. Pat. USA 4307242 from 24.11.80). However, the use of regenerated contact mass so reduces the selectivity of the process that becomes uneconomic.

The closest to the invention is a method of granulating solid waste synthesis organochlorosilanes (EPO, 0201200), including balling them under the influence of the liquid agent is water, followed by drying the resulting granules at a temperature provided by the heat released during the interaction of waste synthesis organochlorosilanes with water.

The disadvantage of this method is that the obtained granules do not have the strength necessary for their long-term transportation and meets the requirements of metallurgical production in terms of durability of the pellets (90-150 kg/Grand).

The technical objective of the proposed solutions is to obtain granules, the strength of which meets the requirements of metallurgical production.

This technical result is balling them under the influence of liquid agent on the basis of water, followed by drying the resulting granules, moreover, in the liquid agent is further added additive, which uses caustic soda and/or sodium silicate and/or calcium hydroxide, with the following ratio of components, wt.%:

Additive - 5 - 40

Water - the Rest

The obtained granules after drying, is subjected to calcination at an elevated temperature.

The granulation can be performed using a binder.

As a binder, it is advisable to use bentonite and/or lime and/or the mold, and/or dolomite flour, and/or clay, or mixtures thereof.

It should be noted that the spent contact mass in a natural way not okomkovaniya, droplets are fed into the granulator water practically does not serve as centers for nucleation, and, ultimately, when excess moisture all material is folded into a single solid mass.

The essence of the proposed method consists in the formation of agglomerates of particles, uniformly wetted with the liquid agent of the composition, or the layering of dry particles on the moistened engine by processing solid and pulverized waste ACM and cyclone dust with a binder in a rotating drum granulator or another, for example, disc, pellet mill with th product in the form of spherical granules with the size of 5-40 mm Studies have shown that binding additives, such as bentonite, silica clay, dolomite flour, lime, clay can be introduced in solid waste in dry form (powder) before irrigation and washing of the entire mass. This granulation is proceeding normally, if dispersed composition is in the range of 5-500 μm. The size of granules reaches 5-40 mm, and their strength after drying is 0.5-3.0 kg/Gran. Subsequent calcination of the pellets with a gradual increase in temperature to avoid cracking of the pellets, significantly increases the strength of the latter. The calcining can be carried out at a temperature of 130-200oC to the temperature at which begins the chemical destruction of the granules. The strength of granules increases and reaches values 90-150 kg/Gran. that fully satisfies the requirement of the granules, as a commodity product for further processing and metallurgical industry.

Example 1.

In rotating with a speed of 10 rpm./min drum having sequentially arranged sections of the dust boot and the irrigation liquid agent, granulating and drying the granules evenly loaded for 30 min with 5 kg of a mixture of solid waste direct synthesis methylchlorosilanes (MxC), consisting of 80% of the si with a particle size of 3-500 μm under continuous irrigation in the loading area 30% aqueous solution of sodium silicate (liquid glass) in an amount of 20% to the total mass of solid particles. The temperature in the drying section 115oC. After 1 hour got 5,320 kg of the granulated product with a residual moisture content of 0.3% with sizes of spherical granules of 4.0-45 mm was Then conducted extract granules for 5 days at ambient temperature. The strength of the granules 30-35 kg/Gran.

Example 2.

In rotating with a speed of 10 rpm./min drum having sequentially arranged sections of the dust boot and irrigation her solution, granulating and drying the granules evenly loaded for 30 min with 5 kg of a mixture of solid waste synthesis MxC, consisting of 50% of the OKM and 50% cyclone dust with a particle size of 3-500 μm under continuous irrigation in the loading area 10% aqueous solution of lime - lime milk, the total of which amounts to 25% of the total mass. The temperature in the drying section 50oC. After 2.5 hours, the received 5,104 kg of the granulated product with a residual moisture content of 0.4% with sizes of spherical granules of 8.0-34 mm was Then conducted the calcination of the pellets for industrial conveyor kiln car with a gradual rise in temperature to 600oC. the Strength of the calcined pellet crush strength of 85 kg/Gran.

Example 3.

In the same baraza MxC with the addition of dolomite powder in the amount of 20% by weight of the mixture of solid waste under continuous irrigation in the loading area 20% aqueous sodium hydroxide solution in amounts of 25% to the total weight of the solid mixture. The temperature in the drying section 85oC. After 1.5 hours received 6,420 kg of the granulated product with a residual moisture content of 0.25% with sizes of spherical granules of 5.0-48 mm was Then conducted the calcination of the pellets for industrial conveyor kiln car with a gradual rise of temperature up to 800oC. the Strength of the calcined pellet crush strength of 90 kg/Gran.

Example 4.

To download on a plate granulator waste ACM in the amount of 20 kg was added 2,2 kg of dry hydrated lime and mixed to a homogeneous state. The obtained dry mixture with continuous rotation of the plate with a speed of about 8-10. /min irrigated water in an amount of 12-15% by weight of the mixture for 0.5 hours. Got rolled up into spherical granules mass with a diameter 8-14 mm, after which the granules are dried. The temperature in the drying chamber 115oC. Strength of dry granules of up to 2.0 kg/Gran. They were followed by calcination of the pellets for industrial conveyor kiln car with a gradual rise in temperature to 1180oC. the Strength of the calcined pellet crush strength of 80 kg/Gran.

Example 5.

To download on a plate granulator waste ACM in the amount of 20 kg was added 2.2 kg of bentonite and AC is in irrigated in the loading area 10% aqueous solution of lime - lime milk, the total of which is about 12-15% by weight of the mixture for 0.5 hours. Got rolled up into spherical granules mass with a diameter 8-14 mm, After which the granules are dried. The temperature in the drying chamber 115oC. Strength of dry granules of up to 2.0 kg/Gran. They were followed by calcination of the pellets for industrial conveyor kiln car with a gradual rise in temperature to 1180oC. the Strength of the calcined pellet crush strength 130-150 kg/Gran.

Example 6.

Similar experiments carried out with the addition of the same quantity of ACM 3.0 kg of dolomite flour. Got granules in size similar to the previous one. The strength of the granules after drying was 0.5 to 0.6, and after calcinations - 65-80 kg/Gran.

Example 7.

Similar experiments carried out with the addition of the same quantity of ACM 3.0 kg of a mixture of a binder consisting of 1.1 kg of lime and 2.0 kg of clay. The size of the resulting granules was 22-38 mm granules after drying was 2-3 kg/Gran, after calcination 120-140 kg/Gran.

Were tested and the contact masses of other compositions. Results similar to the following.

Thus, the method for obtaining from the blended binders, moreover, the granules of the chemical composition and strength satisfy technical requirements.

1. Method of granulating solid waste synthesis organochlorosilanes, including balling them under the influence of liquid agent on the basis of water, followed by drying the resulting granules, characterized in that the liquid agent is further added additive, which uses caustic soda and/or sodium silicate and/or calcium hydroxide in the following ratio, wt.%:

Additive - 5 - 40

Water - the Rest

the obtained granules after drying, calcined.

2. The method according to p. 1, characterized in that the washing is conducted with a binder.

3. The method according to PP.1 and 2, characterized in that the binder used bentonite, and/or lime and/or the mold, and/or dolomite flour, and/or clay, and/or mixtures thereof.

 

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