Electrolysis Colorant Additive (I)

(Product No.: TQ-92)
TQ-92 electrolysis colorant additive is an early product of the company, and it is used by many aluminum manufactories. It won a gold medal in the New Technology and New Products Fair held by the National Defense Science & Technology Committee and Guangzhou Municipal Government in 1992.

1. Characteristic
1.1 The trough liquid has a good stability, and keeps clean for more than five years. The components of the trough liquid are simple, and the filling is easy. It is rare that failure of trough liquid maintenance causes ratio maladjustment of the components.
1.2 The repeatability is good, and the grounding is stable, and the color is sightly.
1.3 It has a wide operation range and low consumption.

2. Technical Parameters:
Tin(II) sulfate: 8-12g/1
Sulfuric acid: 15-18g/1
Voltage: 12-18V
Time:1-12min(depending on the colored depth)
Nickel sulfate: 15-20g/1
TQ-92: 10-12g/1
Temperature: 15-24⁰C
pH value: 0.8-1.2

3. Control of Trough Liquid
The components are added according to the content of components in the trough liquid, which is determined by chemical analysis method.
Under normal conditions, each colorant component is consumed at 450m²/T·h for colorant material.
Tin(II) sulfate≤3kg/T TQ-92≤3kg/T nickel sulfate≤1.2kg/T
TQ-92 colorant is added at the same quantity of Tin(II) sulfate, and it is also adjustable according to the production capacity and frequency.

4. Analysis Method:
SnSO₄ analysis: Add 10ml of trough liquid to a 250ml conical flask, and add 5ml of 1+1 HC1, and add water up to 100ml, then drip several drops of 1% starch solution, and then titrate the solution with 0.1N iodine standard solution till the end point (livid purple). Record the consumption volume (A ml) of iodine standard solution.
Calculation: SnSO₄ g/1=A*10.74*NI2

Free H2SO4 analysis and pH value measurement of the trough liquid: Add 50ml of trough liquid to a 100ml beaker, and measure the pH value with pH meter, then stir the solution with magnetic stirrer (take care not to collide with pH electrode), and then titrate the solution carefully with 0.1N NaOH standard solution until pH=2.1. Record the consumption volume (ml) of NaOH standard solution.

FreeH₂SO₄ g/1=0.98N_NaOH V_NaOH

Analysis of nickel sulfate concentration: Add 10ml of trough liquid to a 300ml conical flask, and add about 200ml of water, then add 4ml of 50% tartaric acid, 8ml of 50% potassium fluoride, 6ml of 36% acetic acid and 4ml of 50% ammonium acetate, and then rock the conical flask and make them mix evenly. Heat the solution to 80-90?, and add several drops of Cu-PAN as indicator, and titrate the solution with 0.1M EDTA standard solution till the end point (purple turns yellow). Record the consumption volume (ml) of EDTA.

Nickel sulfate concentration NiSO₄.6H₂O g/1=26.27*M_EDTA*V_EDTA

5. Note:
As SnSO4 tends to hydrolyze when exposed to air, special attention must paid to the airproof of circulation system pump and pipelines. The mixing circulation of air and solution must be avoided to prevent the large assumption of SnSO₄.