KLD Machinery

The company respected "pragmatic, hard work, responsibility," the entrepreneurial spirit, and integrity, and win-win, and create business philosophy, and create a good business environment to new management models, improve technology and good service, excellent quality for survival , We always adhere to the user first intention to serve customers, insist on using their services to impress customers.

Determination of protective base in leaching solution

2020-09-15 10:48

Introduction：Determination of protective base in leaching solution The alkalinity in leachate mainly comes from free cyanide and lime (CaO). The so-called protective base refers to the content of free calcium oxide. Therefore, the base of free cyanide

Determination of protective base in leaching solution

The alkalinity in leachate mainly comes from free cyanide and lime (CaO). The so-called protective base refers to the content of free calcium oxide. Therefore, the base of free cyanide should be offset by silver nitrate, then calcium oxide should be titrated with oxalic acid with phenolphthalein as indicator.

Main chemical reaction:
      AgNO₃+2NaCN=NaAg(CN)₂+NaNO₃
     H₂C₂O₄·2H₂O+CaO=Ca₂C₂O₄+3H₂O
analytical reagent:
(1) Phenolphthalein :1% ethanol solution；
(2) Oxalic acid standard solution: weighing 2.241 g oxalic acid analytical pure, dissolved in boiled and cooled distilled water, transferred into 1000 ml capacity bottle, diluted with distilled water to the standard line, shake well. This solution is equivalent to 1 mg of calcium oxide per milliliter.
Analytical procedures:
Adding 1% phenolphthalein indicator 2 ~ 3 drops to the solution after determination of free cyanide, see "determination of free sodium cyanide in leachate". Titrate with oxalic acid standard solution until red disappear as the end point.
Calculation of the concentration of free calcium oxide by the following formula:
                           CaO(g/l)＝（V₁·T）/V₀
In the form: V₁-titration consumption of oxalic acid standard solution (ml)
T- oxalic Acid to calcium oxide (mg / ml)
V₀- amount of liquid taken (ml)

上一篇：The second example of flotation and cyanide gold extraction

下一篇：The main equipment of the adsorption circuit of the carbon p

< Back to list