SU685136A3 - Method of obtaining granulated calcium hypochlorite - Google Patents

Description

one

This invention relates to the technology of obtaining granulated calcium pspochlorite, used as a part of bleaching agents.

A method for producing granulated calcium phosphate chlorite was replaced by dehydrating the calcium calcium fluorochlorite to a moisture content of 10-30 wt.%, Granulating it and drying the obtained granules. Granulation is carried out by pressing or extruding 1.

The disadvantage of this method is the low mechanical strength of the product, as a result of which the losses from the destruction of the fan when drying and transporting reach 20%.

The aim of the invention is to increase the strength of the granules.

This goal is achieved by the fact that in a known method for producing granulated calcium hypochlorite, including its graduation and the resulting granules, calcium calcium hypochlorite is additionally applied to the surface of the granules (Active chlorine content 10-30% in an amount of 5-40% by weight.

Distinctive features are the application on the surface of the granules of an additional layer of calcium hypochlorite, its quantity, the content of active chlorine in it.

The indicated grades allow to increase the mechanical strength of the granules and thus reduce losses during drying and transportation up to 1%. When applied to the surface of granules pshohlorit Kalsh1 with an active chlorine content of less than 10%, the average content of active chlorine in the product decreases, which limits the possibilities of its use as a bleach, while the content of active chlorine (H) decreases with more than 30%. When applied to

The surface of calcium hypochlorite containing 5% by weight of active chlorine in the amount of honey increases the strength of the granules only slightly, while the average content of active chlorine in the product is lower in an amount of more than 40% by weight.

For additional hardening of the granules, it is possible to apply sodium borate, or hydrated aluminum sulphate, or magnesium in an amount up to 30 wt.%, Or acrylic acid ol to 3 wt.% On their surface.

Example 1. A calcium hypochlorite filter cake with an active chlorine content of 83% is dispersed in water until a paste with a water content of 55% by weight is obtained. The slurry is sprayed at a speed of 111 kg / h in a rotating drum onto a retour layer with a grain size of -20 to f 30. At the same time, air heated to 121 C at a speed of 800 cubic meters is supplied to the drum. ft / min The temperature in the drum support 52 ° C. I charge 61 kg / h of granulated calcium plichlorite with a content of active chlorine of 81%. Calcium hypochsilite with active chlorine content of 30% in a quantity of 65 kg / h is sprayed onto 80 kg of nonyneifflbix granules in the same drum until the weight of the bed is 100 kg. The average content of active chlorine after drying the granules is 68%. The product has a spherical particle shape and is free from dust. Loss during drying and transportation of 1 wt.%.

Example 2. A rotary drum containing 4 pounds of granulated oGy r0hadd {L1-. that calcium with soderzhan this act

7 pounds of calcium hypochlorite with active chlorine content of 15% at 43 ° C are sprayed. Plant capacity 0.75 kg / h. Pellets with a moisture content of 20 wt.% For 50 minutes kept in a stream of air heated to. Anhydrous product is obtained with a content of active chlorine of 72%. Losses during drying are insignificant.

Claims (1)

1. Patent Sva N 2195755, cl. 23-88, 04/02/40.