SU1219362A1 - Method of producing high-density aqueous suspension of quartz glass - Google Patents

Description

one

The invention relates to ceramics industry, in particular to the production of small-sized and large-sized products made of quartz glass by the method of water slip casting,

The aim of the invention is to increase the grinding efficiency and productivity of the mill, as well as the processing of large-sized products.

Due to the relatively small amount of water in the early hours, the grinding continues to increase the impact force of the grinding bodies, which speeds up the process of coarse grinding of glass. After the end of coarse pulverization, the amount of water that is missing is added to obtain a given ishiker density and fine grinding occurs, mainly due to abrasion. An increase in the glass: water ratio from 1: 0.075 to 1: (O, 12–0.13) allows an increase in the grinding efficiency to 100%, i.e. They grind all the loaded glass without residue and, thereby, increase the productivity of the mill (the output of the slip from 1 kg of glass increases from 0.33 to 0.6 l).

Example 1. In a corundum lining mill, 100 kg of quartz glass in the form of bo tubes, 250 kg of alundum grinding bodies, 9 liters of water (glass: grinding bodies: water ratio 1: 2.5: 0.09) are loaded and ground. After 5 hours, another 3 liters of water are added (based on i mac.h glass of 0.03 mash water), the grinding continues. After 12 h, the slip parameters are as follows:

Density, g / cm 1.89

Fineness grinding,% 5

pH 3.7

Output slip

from 1 kg of glass, l 0,6

Example 2. Loading the mill according to example 1. After 4 hours, 4 liters of water are added to the mill (based on the I wt.h glass 0.04 May water). At the end of grinding, the sniper has the parameters:

Suspension density, 88

Particle content

up to 5 microns,% 21

VNIIPI Order 1200/22 Circulation 555 Subscription Branch PPP Patent, Uzhgorod, ul. Project, 4

193622

pH3.8

The output of the slip with 1 kg of glass, l 0,6 Density of raw cooking, g / cm 1,9

The slip obtained by the proposed method in all respects meets the requirements for forming compact blanks. To form large-sized blanks (height of 650–1300 mm), the parameters of this slip, in particular pH, do not ensure the quality of the blanks, which was confirmed by experiment: preparations made with a pH of 3.2-4.5 are destroyed in the form or on the base. Therefore, the pH of the slurry is adjusted to the herd and stabilized by the addition of 2Q aqueous ammonia. Moreover, blanks obtained from slips with a pH of 7.2, as a rule, are destroyed.

Example 3. The slip obtained in 25 of Example 1, in an amount of 180 liters, is in a stabilizer. 12 hours after the beginning of stabilization, one-time injection is introduced, ammonia is added in an amount of 0.17 ml / l, 180 l, 30.6 ml. After 4 hours, the .рН value is 7.2. At the same time, the density of the suspension is 1.89 g / cm, the content of particles up to 5 μm is 25%, the residue on the grid is 0.063–6.2%, the viscosity is conditional 30 s, and the density of the raw billet is 1.94 g / cm.

Example 4, In the slip obtained in Example 1, after 12 hours of stabilization, a three-time addition is introduced. ka ammonia with an interval of 2-4 hours in a box of 0.17 mi / l 3 "180 l 9 ,, 8 cells. the pH of the slip increases from 3.85 to 7.65.

The density of the suspension is 1.88 g / cm, the content of particles up to 5 μm is 27.3%, the residue on the grid No. 0063 is 4%, the viscosity is conditional 25 s, the density of the raw billet is 1.95 g / cm.

The properties of the workpieces obtained by the intended method are as follows: the density of the raw workpieces is 1.92-1.95 g / cm, and the annealed at% linear shrinkage of 1.99-250 g / cm; the porosity is 7-12%; more than 5 kgf / mm.

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Claims (2)

1. METHOD OF PRODUCING HIGH-DENSITY WATER SUSPENSION OF QUARTZ GLASS for the manufacture of ceramic products by wet grinding in a ball mill with alundum grinding bodies followed by the additional introduction of water · and stabilization of the suspension, characterized in that, in order to increase the grinding efficiency and performance of the mill, the glass ratio and water with wet grinding is 1: 0.09, and additional introduction of water is carried out after 4-5 hours on the basis of May 1. hours glass 0.03-0.04 parts by weight water. 2. A method according to claim 1 of m and n ayusch hours and minutes with the I that, in order to obtain large articles of Great _th rank slurry pH in step F stabipi- tion was adjusted to 7.2-7.7 with aqueous ammonia solution. SU ... 1219362 1 1219362