SU579367A1 - Method of removing rosin at paper and board making - Google Patents

Description

contains lizardite, magnetite, dolomite, calcite.

The product is introduced in an amount of 0.1-10% by weight of absolutely dry fiber (preferably 1-4%).

The content of serpentine and brucite with a positive zeta potential of 17–19 mV in the chrysotile-containing product, instead of 11 mV for pure chrysotile asbestos, contributes to a general increase in the zeta potential of the product used, which, in turn, increases the efficiency of resin removal.

Example 1. A sulphite cellulose fiber suspension is taken containing an emulsified resin and an aqueous suspension of a chrysotile-containing product with a particle size distribution is introduced into it: less than 1 µm - 16%, 1-- 2 µm -44%, 2-3 µm - 14.5 %, 3-4 microns - 15.5% and more than 5 microns-10%. The chemical composition of the product used: 80% chrysotile asbestos, 12% serpentine, 4% brucite, 4% associated impurities. The resulting suspension is moved within 15 minutes

The amount of adsorbed resin on the chrysotile-containing product by the difference in optical density in the aqueous phase of the fibrous suspension is presented in table. one.

Product Offered

Hrioogilasbesg high purity

Example 2. Analogously to Example 1, an aqueous suspension of a chrysotile-containing product, kg) torus 1 st1vr "- t: chrysotile asbestos, 9.6% serpentine, 3.5% brucite is introduced.

Product Offered

Chrysotilasbest high purity

Example 3. An aqueous suspension of a chrysotile-containing product is introduced into the emulsified resin, which contains: 80% chrysotile asbestos, 12% serpentine, 4% brucite, 4% associated minerals and granulated Table 1

10.6

13.8

14.2

11.8

15.2

16.4

26.9% of concomitant minerals with a particle size distribution of 92% of particles less than 5 µm and the adsorption of the emulsified resin on the product used was determined (see Table 2).

Table

14.7

15.1

1O, 9

15.2

16.4

11.8

The composition is similar to Example 1. The adsorption is carried out for 15 minutes and the amount of chrysotile-containing product is determined to adsorb 1 g of the emulsified resin (civ, tab. 3).

Product Offered

Chrysotilasbesg high purity

The results of the analysis of Tables 1-3 show that the method allows to significantly reduce the consumption of the resin removal agent. This, in turn, contributes to the effectiveness of the resin removal process.

Claims (2)

1. The method of removing resin in the manufacture of paper and paperboard by treating the aqueous fiber suspension with a chrysotile-containing substance at a pH of suspension of 5.0-9.5 is different. 10.1 10.4 86 12.2 11.4 due to the fact that, in order to increase the efficiency of the method, a product containing (wt.%) chrysotilasbest 60-80, serpentine 8-12, brucite - 2-4, the remaining mineralogical impurities is used as chrysotile asbestos. moreover, the product is taken with a particle size distribution - 90% of particles with a size of 1-5 microns. 2. The method of claim 1, wherein the chrysotile-containing substance contains lizardite, magnetite, dolomite, calcite as accompanying mineralogical impurities.