SU763269A1 - Method of briquetting sodium sulfate - Google Patents

Description

one

The invention relates to methods for the agglomeration of sodium sulphate used to produce sodium sulphide by reducing it with a carbon-containing reducing agent.

There is a known method of briquetting sodium sulfate by introducing a binding additive into it, in which lignin l is used. The disadvantage of this method is that 14–17% of moisture is contained in the final 10 briquettes, thereby disturbing the operation of the shaft furnaces for the production of sodium sulphide.

The method of briquetting sodium sulphate is also known with the use of a bottoms residue from the distillation of synthetic fatty acids as a binder. The consumption of binder material is 7–8 wt.%. 20 The disadvantage of this method is the high content of organic binder in briquettes, which contributes to an increase in the content of toxic organic impurities in gas emissions from furnace furnaces.

The aim of the invention is to reduce. impurity content in briquettes.

The goal is achieved - the topic / that, as a binding additive, is not

use a mixture of mono- and dicarboxylic acids with the number of carbon atoms Cg-C25- and their sodium salts. Moreover, the binder contains carboxylic acids of composition (Cj-Cu) 15-18%,

(C O-CSQ) 45-55%, (C ig-Cj) 28-30% and the remaining sodium salts of these acids. The binder is administered in an amount of 0.5-3.0%.

Example 1. Sodium sulphate is moistened to 4-5%, mixed, and at the same time a binder is added at the rate of 2% in the mixture. The binder is added as follows,%: synthetic fatty acids (CjrC) 17, (Co-C-) 24, (C., 4-C4b) 25,

() 22, CgjlOf Na-salts of acids 2. The mixture is briquetted at a specific pressure of 250 kg / cm and. Get cylindrical briquettes: diameter 45, height 40 mm with a mechanical compressive strength of at least 15 kg / cm. Example 2 A mixture was briquetted under the conditions specified in Example 1, but the binder additive was introduced in an amount of 3%. The compressive strength of the briquettes is 30 kg / cm. A decrease in the binder content in briquettes from 7-8 to 0.5-3% improves the productivity of shaft furnaces and reduces the content of organic impurities in gas emissions from sulfur dioxide.

During the implementation of the proposed method, sodium sulfate - OTt - the course of production of synthetic fatty acids containing up to 3% of a mixture of mono- and dicarboxylic acids and their salts can be used as a binder.

Claims (2)

1. A method of briquetting sodium sulfate by pressing it in the presence of a binder additive, characterized in that reducing the content of impurities in briquettes; as a binding additive, a mixture of mono- and dicarboxylic acids with the number of carbon atoms CcC | 25- and their sodium salts is used. 2. The method according to claim 1, about tl and h and yu and with the fact that the specified binder contains carboxylic acid composition () 15-18%, (C o-Cyo) 45-55,% t 9 j te as .) 28-30% and octog sodium salts of these acids. Sources of information taken into account in the examination 1. Authors. Certificate of the USSR 210115, cl. C 01 D 5/00, 1968. 2. USSR author's certificate 498265, cl. C 01 D 5/00, 1976.