Method for producing sodium silicate solution

专利摘要:
The present invention comprises a process for the manufacture of a sodium silicate solution in a continuous manner from a silicon dioxide-containing material, comprising continuously adding to a reaction zone a stream of said silicon dioxide-containing material and a stream of a sodium hydroxide-sodium carbonate solution, reacting said silicon dioxide-containing material and said sodium hydroxide-sodium carbonate at a temperature and pressure and for a time sufficient to form a sodium silicate solution, and recovering said sodium silicate solution from the reaction zone.
公开号:SU1313341A3
申请号:SU802954165
申请日:1980-07-24
公开日:1987-05-23
发明作者:Деабриж Жан
申请人:Продюи Шимик Южин Кюльман (Фирма)；
IPC主号:

专利说明:

113
This invention relates to the field of inorganic chemistry, in particular, to methods for producing a solution of sodium silicate from silica sand in an autoclave.
The aim of the invention is to intensify the process and reduce the impurity of iron in the target product.
Example 1. A stock solution was prepared from 428 kg of pickling solution containing 193 kg of NaOH, to which 8 kg and 570 were added to water. The resulting solution has a thaw.
0.83
and contains 193 kg of NaOH
(232.5 g / l), 8 kg, (9.6 g / l) 5 and 805 kg. A part of this solution, Oj21 m, is used to transfer 343 kg of sand containing 341 kg of SiOj to a slurry.
The resulting suspension with a volume of 0.34 m is injected into the autoclave. The rest of the initial solution is heated to 275 ° C and is also injected into the autoclave. In the autoclave, the slurry has a temperature of 240 ° C and a pressure of 27 bar. The residence time of the suspension in the autoclave is 25 minutes. Then, under pressure, the suspension is cooled by throttling, diluted with 0.22 m of water, settled and filtered. The solid residue has a weight of 15 kg and contains 13 kg of SiO-. Filtered solution
Sl
sodium silicate has a volume of 1.03 m and contains 191 kg of NaOH, 7.5 kg., 328 kg of SiO, 32 g of Fe, Si04 / NaOH l, 72. 35
PRI mme R 2. Work is carried out according to Example 1. A 0.8 m alkaline solution containing 169 kg of NaOH (210 g / l), 12 kg, (15 g / l) is prepared. A portion of this 0.2 m solution is used for suspensions.
A sand loading of 276 kg (274 kg of SiO) is introduced into a volume of 0.21 m. Suspension at t 245 C is held in an autoclave for 30 minutes. 0.73 m of a silicate solution containing 125 kg of NaOH, 234 kg of SiO, 31 g of Fe, SiOj / / NaOH, 1.87 was obtained.
PRI me R 5. Prepare a solution with a volume of 0.85 m, containing 195 kg of NaOH (230 g / l), 13 kg (15.3 g / l). Enter a charge of 508 kg of sand (506 kg of SiO) in volume of solution 0.2
m
Suspension hold for
. about,
thirty ;
35 min, in an autoclave at t 245 C. After draining and filtering, a 1.2 m silicate solution was obtained containing 192 kg of NaOH, 389 kg of SiO, 2.03.
The proposed method allows to significantly intensify the process (20-35 min) and to obtain solutions with low iron content, suitable for obtaining pure zeolites.

权利要求:
Claims (1)
[1]
Invention Formula
A method of preparing a sodium silicate solution by reacting silica sand with an alkaline solution in an autoclave, characterized by
45
314 kg of sand (312 kg of SiO). By the fact that, in order to intensify the process and reduce the impurity of iron in the target product, the alkaline solution is taken with the content of sodium hydroxide 180-230 g / l and sodium carbonate 15-18 g / l, the process is carried out at 225-245 C, pressure 27 bar and mass ratio of SiO., / NaOH in solution 1, 2.02.
The reaction proceeds in an autoclave at t = 225 C for 20 minutes. After draining and drying, 31 kg of solid product and 0.88 m of silicate solution with a content of 166 kg of NaOH, 283 kg of SiO were obtained.
r m i me r 3.
8 g Fe, Si02 / NaOH l, 7. Prepare 1 m of alkaline solution containing 210 kg.
50
O
five
NaOH (210 g / l), 18 kg, (18 g / l). 526 kg of sand (522 kg of SiO) are introduced into a volume of 0.21 m. The suspension is loaded into an autoclave at 230 ° C. and held there for 35 minutes. After draining and filtration, 1.26 m of a silicate solution containing 207 kg of NaOH, 408 kg of SiO-z, 25 g of Fe, SiO ,, / NaOH l, 97 was obtained.
PRI me R 4. Prepare 0.7 m of an alkaline solution containing 127 kg of NaOH (181 g / l), 11 kg (15.7 g / l),
A sand loading of 276 kg (274 kg of SiO) is introduced into a volume of 0.21 m. Suspension at t 245 C is held in an autoclave for 30 minutes. 0.73 m of a silicate solution containing 125 kg of NaOH, 234 kg of SiO, 31 g of Fe, SiOj / / NaOH, 1.87 was obtained.
PRI me R 5. Prepare a solution with a volume of 0.85 m, containing 195 kg of NaOH (230 g / l), 13 kg (15.3 g / l). A load of 508 kg of sand (506 kg of SiO) is introduced into the solution volume of 0.2.
m
, 35
40
Suspension hold for
. about,
thirty ;
35 min, in an autoclave at t 245 C. After draining and filtering, a 1.2 m silicate solution was obtained containing 192 kg of NaOH, 389 kg of SiO, 2.03.
The proposed method allows to significantly intensify the process (20-35 min) and to obtain solutions with low iron content, suitable for obtaining pure zeolites.
Invention Formula
A method of preparing a sodium silicate solution by reacting silica sand with an alkaline solution in an autoclave, characterized by

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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FR7919149A|FR2462390B1|1979-07-25|1979-07-25|

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