medium Concentration (mass fraction) (%) Temperature / °C Corrosion rate / mm / a (years) Corrosion resistance Inorganic acid hydrochloric acid 1 Room temperature / boiling 0.000/0.345 Good/good 5 Room temperature / boiling 0.000/6.530 Good/poor 10 Room temperature / boiling 0.175/40.87 Good/poor 20 Room temperature / 1.340/- difference/- 35 Room temperature / 6.660/- difference/- sulfuric acid 5 Room temperature / boiling 0.000/13.01 Good/poor 10 Room temperature / 0.230/- good/- 60 Room temperature / 0.277/- Good/poor 80 Room temperature / 32.660/- difference/- 95 Room temperature / 1.400/- difference/- Nitric acid 37 Room temperature / boiling 0.000/<0.127 Excellent / excellent 64 Room temperature / boiling 0.000/<0.127 Excellent / excellent 95 Room temperature / 0.0025/- excellent/- Phosphoric acid 10 Room temperature / boiling 0.000/6.400 Good/poor 30 Room temperature / boiling 0.000/17.600 Good/poor 50 Room temperature / 0.097/- excellent/- Chromic acid 20 Room temperature / boiling <0.127/<0.127 Excellent / excellent Nitric acid + hydrochloric acid 1:3 Room temperature / boiling 0.0040/0.127 Excellent / excellent 3:1 Room temperature / <0.127/— excellent/- Nitric acid + sulfuric acid 7:3 Room temperature / <0.127/— excellent/- 4:6 Room temperature / <0.127/— excellent/- Organic acid acetic acid 100 Room temperature / boiling 0.000/0.000 Excellent / excellent formic acid 50 Room temperature / 0.000/- excellent/- oxalic acid 5 Room temperature / boiling 0.127/29.390 Good/poor 10 Room temperature / 0.008/- excellent/- Lactic acid 10 Room temperature / boiling 0.000/0.033 Excellent / excellent 25 -/boiling —/0.028 -/excellent Formic acid 10 -/boiling —/1.270 -/good 25 —/100 —/2.440 -/difference 50 —/100 —/7.620 -/difference Danlic acid 25 Room temperature / boiling <0.127/<0.127 Excellent / excellent Citric acid 50 Room temperature / boiling <0.127/<0.127 Excellent / excellent Stearic acid 100 Room temperature / boiling <0.127/<0.127 Excellent / excellent Alkaline solution Sodium hydroxide 10 -/boiling —/0.020 -/excellent 20 Room temperature / boiling <0.127/<0.127 Excellent / excellent 50 Room temperature / boiling <0.0025/0.0508 Excellent / excellent 73 -/boiling —/0.127 -/good Potassium hydroxide 10 -/boiling —/<0.127 -/excellent 25 -/boiling —/0.305 -/good 50 30/boiling 0.000/2.743 Good/poor Ammonium hydroxide 28 Room temperature / 0.0025/- excellent/- Sodium carbonate 20 Room temperature / boiling <0.127/<0.127 Excellent / excellent Armonia 20 Room temperature / 0.0708/- excellent/- Inorganic salt solution Ferric chloride 40 Room temperature / 95 0.000/0.002 Excellent / excellent Ferrous chloride 30 Room temperature / boiling 0.000/<0.127 Excellent / excellent Lead chloride 10 <0.127/<0.127 Cuprous chloride 50 <0.127/<0.127 Ammonium chloride 10 <0.127/<0.000 Calcium chloride 10 <0.127/<0.000 Aluminum chloride 25 <0.127/<0.127 Magnesium chloride 10 <0.127/<0.127 Nickel chloride 5-10 <0.127/<0.127 Barium chloride 20 <0.127/<0.127 Copper sulfate 20 <0.127/<0.127 Ammonium sulfate 20 ° C saturation <0.127/<0.127 Sodium sulfate 50 <0.127/<0.127 Lead sulphate 20 ° C saturation <0.127/<0.127 Cuprous sulfate 10 <0.127/<0.127 30 <0.127/<0.127 Silver nitrate 11 Room temperature / <0.127/— excellent/- Organic compound Benzene (containing trace amounts of HCl, NaCl) Vapor and liquid 80 0.005 excellent Carbon tetrachloride Ibid. boiling 0.005 Tetrachloroethylene (stable) 100% vapor and liquid 0.0005 Tetrachloroethylene (H 2 O) 0.0005 Trichloromethane 0.003 Trichloromethane (H 2 O) 0.127 good Trichloroethylene 99% vapor and liquid 0.00254 excellent Trichloroethylene (stable) 99 0.00254 formaldehyde 37 0.127 good Formaldehyde (containing 2.5% H 2 SO 4 ) 50 0.305 good Note: 1. Corrosion resistance grade is divided into three levels: Excellent - corrosion resistance, corrosion rate is below 0.127mm / a. Good - moderate corrosion resistance, corrosion rate between 0.127-1.27mm / a. Poor - not resistant to corrosion, corrosion rate is above 1.27mm / a. 2. Pure titanium in most media, especially those with high corrosion resistance in a neutral, oxidizing medium and sea water. Titanium in seawater corrosion resistance than aluminum alloy, stainless steel and nickel alloys is higher in the air industry, agriculture and marine environment, although a few years, is not discolored surface. Hydrofluoric acid, sulfuric acid, hydrochloric acid, orthophosphoric acid and some hot concentrated organic acids have a greater corrosion to titanium (see table above), and hydrofluoric acid has a high corrosive effect on titanium regardless of concentration and temperature. Titanium has high stability to various concentrations of nitric acid and chromic acid, and has high corrosion resistance in alkali solutions and most organic acid and inorganic salt solutions. 3. Titanium does not undergo local corrosion and intergranular corrosion, and corrosion is performed uniformly. 4. The corrosion resistance of titanium alloys is similar to that of industrial pure titanium, which is why titanium alloys are widely used in the chemical and shipbuilding industries. Gold Gravity Concentration Equipment
The STL water-jacketed Gold Concentrator is a kind of gravity separation equipment. It was developed by Changchun Gold Research Institute Co., Ltd. in 1985 and entered the market. At present, it has been used in many domestic and foreign companies. It is suitable for the recovery of single gold in placer gold, vein gold mines and polymetallic mines, instead of mercury plate operations. The addition of large single gold particles in the collected ore before flotation can further increase the recovery rate of gold mines, and it can also be used from gold-bearing mines. Separate single gold from flotation gold-copper concentrate and flotation gold concentrate.
The main indicators of this series of equipment basically reach the level of similar international products (such as Nielsen gold selectors, etc.). Compared with similar equipment at home and abroad, this series of equipment has the advantages of high cost performance, easy operation, and low maintenance costs.
Gold Gravity Concentration Equipment,Gold Separating Concentrator,Gold Recovery Centrifugal Concentrator,Centrifugal Gold Concentrator Changchun Gold Research Institute Co.LTD , https://www.changchungoldresearch.com
Titanium corrosion data