|
Process step |
% |
Products |
°C |
Running Time |
Remarks |
|
Pre-soak |
300 |
water |
28 |
|
|
|
|
0.1-0.2 |
Negahdar Ist-WB |
|
|
|
|
|
0.1 |
Rockol 642 |
|
run 30 mins. |
|
|
|
|
|
|
rest 30 mins |
|
|
|
|
|
|
run 30 mins. |
|
|
Drain |
|
|
|
|
|
|
Main soaking |
200 |
water |
28 |
|
|
|
|
0.2-0.3 |
soda ash |
|
|
|
|
|
0.3-0.5 |
Negahdar IST-WB |
|
|
|
|
|
0.1-0.2 |
Rockol 642 |
|
run 30 mins. |
|
|
|
|
|
|
leave automatic |
|
|
|
|
|
|
rest 45 mins. |
|
|
|
|
|
|
run 5 mins. |
|
|
|
|
|
|
total time 8-12 hrs |
|
|
|
|
|
|
|
pH= 9.2-9.5 |
|
|
|
|
|
|
Be < 3.5 |
|
Drain |
|
|
|
|
|
|
Liming |
70 |
water |
28 |
|
|
|
|
1.5
|
sodium hydrosulphide,72% |
|
run 30 mins |
|
|
|
|
|
|
rest 30 mins. |
|
|
|
1.0 |
sodium sulphide,60% |
|
|
|
|
|
0.5 |
hydrated lime |
|
run 30 mins |
|
|
|
|
|
|
rest 30 mins |
|
|
|
1.0 |
sodium sulphide,60% |
|
|
|
|
|
1.0 |
hydrated lime |
|
run 30 mins |
|
|
|
|
|
|
rest 30 mins |
|
|
|
0.5 |
sodium sulphide,60% |
|
|
|
|
|
1.0 |
hydrated lime |
|
run 30 mins |
|
|
|
|
|
|
leave automatic |
|
|
|
|
|
|
run 5 mins |
|
|
|
|
|
|
rest 60 mins |
|
|
|
|
|
|
total time 16-18hrs |
pH=12.5 |
|
|
|
|
|
|
26-28°C |
|
Drain |
|
|
|
|
|
|
Washing |
200 |
water |
28 |
run 15 mins |
|
|
Drain-unload-fleshing-weight |
|
|
|
|
|
|
Reliming |
200 |
water |
25 |
|
|
|
|
0.1 |
Rockol 642 |
|
|
|
|
|
1-1.5 |
hydrated lime |
|
run 20 mins |
|
|
|
|
|
|
Leave automatic: |
|
|
|
|
|
|
run 2 mins |
|
|
|
|
|
|
rest 45 mins |
|
|
|
|
|
|
total time: |
|
|
|
|
|
|
12-14 hrs |
pH >12.5 |
|
Drain |
|
|
|
|
|
|
Washing |
200 |
water |
30 |
10 mins |
2 times |
|
Drain |
|
|
|
|
|
|
Deliming |
50 |
water |
30 |
|
|
|
|
0.5 |
Rockaltal F |
| |