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.
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Commonly used materials and various materials heat treatment analysis
Body a wide range of materials, suitable for a variety of conditions. Commonly used valve body material has the following nine: 1 gray cast iron, suitable for working temperature between -15 ~ +200 ℃, nominal pressure PN ≤1.6MPa low-pressure valve. 2. Black malleable iron, suitable for working temperature between -15 ~ +250 ℃, the nominal pressure PN ≤ 2.5MPa in the low-pressure valve. 3. Ductile iron, suitable for working temperature between -30 ~ +350 ℃, the nominal pressure PN ≤ 4.0MPa in the low pressure valve. 4. Carbon steel (WCA, WCB, WCC), suitable for operating temperature between -29 ~ +425 ℃, medium and high pressure valves, of which 16Mn, 30Mn operating temperature of -40 ~ +450 ℃, commonly used to Instead of ASTMA105. 5. Low-temperature carbon steel (LCB), suitable for working temperature in the -46 ~ +345 ℃ between the low-temperature valve. 6. Alloy steel (WC6, WC9), suitable for high temperature and high pressure non-corrosive medium operating temperature between -29 ~ +595 ℃; WC5, WC12 for operating temperature between -29 ~ +650 ℃ Corrosive medium temperature high pressure valve. 7. Austenitic stainless steel, suitable for working temperature of -196 ~ +600 ℃ between the corrosive medium valve. Monel, mainly for the valve containing hydrogen fluoride medium. 9. Copper alloy, mainly for the working temperature of -273 ~ +200 ℃ between the oxygen line valve. The above is the valve body commonly used materials in the major categories, each specific type of material, there are many different grades, a variety of different brands and applies to a variety of different pressure levels. Therefore, the choice of valve body material, should be based on different uses and different pressure levels, to determine the needs of the working conditions of the body material. In addition, there are titanium alloy body material (titanium valve), aluminum alloy (aluminum valve); plastic (plastic valve); ceramic (ceramic valve) and so on. Body blank heat treatment process according to different materials are as follows: 1. Gray cast iron heat treatment. For different purposes, gray cast iron can be heat treated differently after casting. Valve production gray cast iron body and other parts of the casting process is often used in the selection of heat treatment process are: eliminate the thermal stress of casting and high temperature annealing to eliminate free cementite. Thermal aging is a must. High temperature annealing is only used instead of thermal aging when casting is due to improperly controlled chemical composition and casting cooling rates, resulting in the presence of primary cementite in the as-cast microstructure. 2 carbon steel heat treatment. Steel castings after casting has a larger casting residual stress, and sometimes cast steel parts coarse, and even overheating. These affect the dimensional stability of steel castings, reduce the mechanical properties of steel and is not conducive to the cutting process. In order to eliminate the casting stress, refine the organization, improve the mechanical properties and improve the machinability, etc., the production of carbon steel valve body and other parts in the cast after the election often use annealing or normalizing + tempering. 3. Austenitic stainless steel acid heat treatment. Austenitic stainless steel acid is the main defect is prone to intergranular corrosion, the general can take a certain amount of heat treatment of steel to prevent measures. Valve production of austenitic stainless steel body parts and other commonly used heat treatment process are: solution treatment (quenching), stable treatment and cryogenic treatment. 4. Martensitic heat-resistant steel heat treatment. Martensitic heat-resistant steel in the casting after the timely annealing to prevent cracks, and annealing time to be sufficient (usually 4 to 8 hours). The purpose of martensitic heat-resistant steel annealing is to eliminate stress, recrystallize, refine grains, reduce hardness, improve machinability, and prepare for final heat treatment. The final heat treatment of martensitic heat-resistant steel is normalized and tempered. 5. High-quality carbon steel heat treatment. High-quality carbon steel heat treatment 35 forged steel body, for example, 35 steel body forging to be normalized, and its final heat treatment according to the provisions of the valve manufacturing technical documents, generally to be quenched and tempered.