SU291897A1 - METHOD OF PREPARATION OF PRE-CHILDREN BRIQUETTES - Google Patents

Description

Known methods for preparing briquettes from pure chalk.

However, they have a number of drawbacks: the humidity of the briquetted chalk mass is high, the weight of a single briquette is difficult, it is difficult for large-scale production of briquettes before they are loaded into a bed.

In order to intensify the process of preparing briquettes according to the proposed method, the chalk chips are dried to a moisture content of 1–9%, crushed to particles of 0.01–0.5 mm in size, moistened to a moisture content of 15–22% and pressed under a pressure of 50–150 kg / cm at a temperature of mass of 20-100 ° C.

The method is carried out as follows.

Chalk crumb (waste from the crushing and screening plant of the chalk quarry, as well as fines generated in the compartment of the plant’s lime kiln workshop), which has a moisture content of up to 25% and less than 40–50 mm pieces in the Cross-section, is rotatable in a drum dryer to a humidity of 1-9%. As a drying agent, it is preferable to take a gas from a shaft lime kiln in which chalk briquettes having a temperature of 120-160 ° C are burned. The dried crumb is ground by a wave or frost crusher to a particle size of 0.01-0.5

The crushed chalk is moistened with hot water or better with water and saturated steam with a pressure of up to 1 kg / cm. Humidification is carried out in a double shaft clay digger. Water flow and

the steam is adjusted in such a way that the moisture of the material leaving the clay mixer is within 15-22% of the weight.

Moist chalk is pressed using a roller press under pressure 50-

150 kg / cm-. The mass entering the press should have a temperature of 20-100 ° C (preferably 50-80 °). Ready-made raw briquettes should be in the form of eggs, lentils and have a weight of 200-700 g. Especially exist briquettes

before they are loaded into a lime kiln, it is not necessary. The gas temperature at the exit of the furnace in which the briquettes are fired should be 120-160 ° C. By lowering the briquettes in the furnace, the rate of increase in the temperature of the lawn environment in the interval of 120–700 ° C should be no more than 200 ° in 1 hour.

Subject invention

The method of preparing briquettes from pure chalk by drying chalk crumb, grinding it and seizing it, followed by pressing the resulting mass, characterized in that, in order to intensify the process, grind to parts of 0.01-0.5 mm in size and moisten to 15 -22% and pressed under a pressure of 50-150 kg / cm at a mass temperature of 20-100.