SU1127845A1 - Method for cleaning quartz raw material - Google Patents

Abstract

1. METHOD FOR CLEANING QUARTZ RAW MATERIALS, including acid leaching with stirring and washing, characterized in that, in order to increase the degree of purification, 5,56-6,25% solution of oxalic acid with a solid-liquid phase ratio of 3.04 is carried out , 0: -1. 2 A method according to claim 1, characterized in that the mixing is carried out in a ball mill.

Description

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H3o6pjffiTeHHe relates to the purification of quartz raw materials and can be used in the production of quartz glass with increased purity requirements, in particular for the production of transparent quartz glass.

A known method of purification of quartz crystal by treating with a mixture of aqueous solutions of acids: hydrochloric, sulfur, and oxalic.

The disadvantage of this method is the low efficiency of cleaning quartz flux, due to the insufficient dissolving ability of an aqueous solution of a mixture of hydrochloric, sulfuric and oxalic acids, which leads to incomplete dissolution of the impurity grains in the quartz raw material.

The purpose of the invention is to increase the degree of purification of quartz raw materials from impurities.

The goal is achieved by the fact that, according to the method of purification of quartz raw materials, including acidic acidification with stirring and rinsing, 5.606, 25% solution of oxalic acid lead to the idealization with a ratio of solid and liquid phases of 3.0-4.0: 1.

Stirring is carried out in a ball mill.

The necessity and sufficiency of the proposed concentration range of oxalic acid solution is due to the fact that at a concentration of 5.50% there is not enough complete dissolution of impurity components in quartz sfe due to the fact that it does not provide fast uniform distribution of oxalic acid when mixed throughout, quartz sf , at a concentration of 6, 25%, the degree of quartz flux does not increase from impurities. The impurity components react most efficiently with oxalic acid at a ratio of solid (T) and liquid (G) phases of 3.0-4.0: 1, at T: W 3.0: a liquid phase is formed above the quartz glass, which does not provide complete purification , with a T: W ratio of 4.0: 1, not all grains of quartz raw materials are wetted, which also does not ensure complete cleaning.

The method is carried out as follows.

Quartz sfye (grain size 0.1-0.4 mm), previously past-enrichment by flotation, is mixed with an aqueous solution of oxalic acid with a concentration of 5.50-6.25% with a solid-to-liquid ratio of 3.0-4.0: 1 and leached under agitation in a ball mill with quartz grinding bodies (quartz pebbles). The number of grinding bodies and their size are selected in such a way that the quartz grains do not overgrind in the mill. After leaching, the quartz glass is washed on the filter with distilled water and dried.

Example 1. A quartz crystal (a product of the Kyptym quartz factory) of the following initial composition, wt%, is used for cleaning: iron 9-lO- j titanium 8-10 -; copper 8-10, magnesium 1.6-10, manganese 6-10,

- 7

Calcium 7.5-10. Size is 0.1-0.4 mm. A portion of quartz crystal is mixed with oxalic acid solution with a concentration of 5.9% in the ratio of solid and liquid phases of 3.5: 1, and then higher when the scientific research institute is mixed in a ball mill at a temperature of 40-50 ° C for 30 minutes.

Quartz pebbles 50-70 mm in size are used for mixing in an ishrove mill. As leaching occurs, the quartz crystal is fully provided. The desired product is washed 5 times with a 1 g / l ammonium oxalate solution and 3 times with distilled water on a polyethylene filter and dried in a polyethylene cup.

The results of the tests carried out according to the spectral analysis are shown in Table. 1 and 2.

Analysis of the table shows that the proposed method, as compared with that from the primary (base object), makes it possible to increase the purification efficiency of quartz from impurities. Thus, the iron content is reduced 10 times (from 210 to 2--10), titanium - by 1.7 times (from 3.5-10 to 2-10), - by 3.7 times (from 3-10 to 8-10). Original 9-10 840- product Limestone method Mixture 2103 3,5-103 acids

2.10

5.50

2-10

6.25 3-10. 5.25 2 -10

6.50

Table 1

--four

-four

8 -10

,-four

240

2 "10

240

-four

-4 8-10-10

240

2-10

2-10

2-10 2.5-10 2-10-.

8.5-10 2.7-10

-3

-four

-four

-four

2-10

2-10

8 -10

2.10

T

Table 2 8-10 6-102 7.5-10 1.6-10 6-10 - 5.-10- 3-10-W-10

Claims (2)

1. METHOD FOR CLEANING QUARTZ RAW MATERIALS, including acid leaching with stirring and washing, characterized in that, in order to increase the degree of purification, leaching is carried out with a 5.50-6.25% solution of oxalic acid with a ratio of solid and liquid phases of 3.04 0: 4. . 2. The method of pop. 1, characterized in that the mixing is carried out in a ball mill.