SU967949A1 - Batch for synthesis of wallastonite - Google Patents

Description

The invention relates to the production of {V-wollastonite and can be used as a raw material for building materials and in other industries.

The known charge for the synthesis of wollastonite, containing chalk and silica component in the ratio of CaO: iSiO, close to one, as well as soda ash and liquid glass l.

The disadvantage of this mixture is a high firing temperature (12001400 ° C).

The closest in composition to the invention is the charge L2J, consisting of the following components, wt.%: Quartz sand 50-65 Mel 31-48

Spodumene 1-3

Fluorspar 1-3 A disadvantage of the known mixture is that, at the firing temperatures of 1100-1150 ° C, firing products, along with | L-volteronite, contain dicalcium silicate, which deteriorates the properties of the ceramic masses.

 The aim of the invention is to improve the phase purity of the target product.

The goal is achieved by a mixture comprising silica, calcium carbonate and ammonium sulfate in the following ratio, wt.%: Calcium carbonate 56.3-62.0 Silica33.7-37.0

Ammonium sulfate 1.0-10.0 As components of the mixture for the synthesis of | b-wollastonite use

10 silica and calcium carbonate. It is also possible to use carbonate-silica rock, which, if necessary, is prepared, for example, tripoli, diatomite up to a CaOrSiOj ratio close to unity. The components are ground in a ball mill for 30 minutes, shuttered with an aqueous solution of ammonium sulfate and calcined at 1000–1200 ° C. .

20

With the introduction of ammonium sulfate in an amount of less than 1.0 wt.%, In addition to (i-wollastonite), other calcium silicates are present in the calcining product.

25 is white, rankinite, as indicated by the results of X-ray phase analysis. The introduction of ammonium sulfate more than 10.0 wt.% Is impractical because it does not affect the phase purity of the product. Synthesis conditions and conditions 39679494

The results are given in the table. Tonites 2.1-2.5 wt.%, Belite OKak follows from the table, the charge for 2.8 wt.% against f-volvollonit

wollastonite synthesis according to isoO-70 wt.%, and {- wollastonite 24 wt.%,

the hardening ensures the production of pro-Belite 5.5% by weight in the known mixture,

duct when containing / 5-vol-which indicates an increase in phase

plastonite 90.3-94.5 wt.%, about -woll- purity of the target product.

including silica and calcium carbonate, characterized in that, in order to increase the phase number of the target product, it additionally contains ammonium sulfate at the following ratio of components, wt.%:

Sources of information taken into account in the examination

1. The author's certificate of the USSR 480676, cl. From 04 to 35/14, 1974 ..

2. USSR author's certificate number 525645, cl. From 04 to 35/14, 1974.

Claims (1)

Claim The mixture for the synthesis of / 5-wollastonite, including silica and calcium carbonate, characterized in that, in order to increase the phase purity of the target product, it additionally contains ammonium sulfate in the following ratio, wt.%: 3Q Calcium Carbonate Silica Ammonium Sulphate 56.3-62.0 33.7-37.0 1.0-10.0