FIELD: chemistry.
SUBSTANCE: invention can be used in obtaining products for optical glass melting. The method of producing pure calcium carbonate includes carbonising an aqueous suspension of calcium hydroxide with carbon dioxide gas. The carbon dioxide is used with 25-30% molar excess relative to the stoichiometric amount of calcium hydroxide. The carbon dioxide is passed through the calcium hydroxide suspension at a rate of 15-20 l/h. The obtained calcium carbonate suspension is filtered and dried at 100-110°C.
EFFECT: invention enables to obtain calcium carbonate with content of basic substance of 99,80-99,88 wt % and output of 95,0-96,0%.
2 tbl, 8 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF OBTAINING SODIUM CARBONATE | 2013 |
|
RU2540659C1 |
| METHOD OF PRODUCING HIGHLY PURE CADMIUM CARBONATE | 2013 |
|
RU2522007C1 |
| METHOD OF PRODUCING HIGH-PURITY CALCIUM CARBONATE | 2009 |
|
RU2414425C1 |
| METHOD FOR OBTAINING CHEMICALLY DEPOSITED CALCIUM CARBONATE | 0 |
|
SU1685871A1 |
| METHOD OF PRODUCING PRECIPITATED CALCIUM CARBONATE, METHOD OF INCREASING CONTENT OF DRY SUBSTANCE OF PRECIPITATED CALCIUM CARBONATE PRODUCT AND REACTOR SYSTEM FOR PRODUCING PRECIPITATED CALCIUM CARBONATE | 2008 |
|
RU2436734C2 |
| METHOD FOR PREPARING CALCIUM CARBONATE DISCRETE PARTICLES | 1999 |
|
RU2215692C2 |
| METHOD OF OBTAINING PRECIPITATED CALCIUM CARBONATE, PRECIPITATED CALCIUM CARBONATE AND USE THEREOF | 2012 |
|
RU2563010C2 |
| METHOD FOR FIXING CARBON DIOXIDE | 2006 |
|
RU2456062C2 |
| PRECIPITATED CALCIUM-CARBONATE PIGMENT, ESPECIALLY APPLICABLE AS COATING FOR PAPER DESIGNED FOR INK-JET PRINTING | 2006 |
|
RU2432374C2 |
| METHOD OF OBTAINING RECTIFIED CALCIUM CARBONATE | 0 |
|
SU1558874A1 |
