Production line for producing national-standard magnesium alloy ingots on the basis of magnesium alloy waste material

Abstract

A production line comprises: a pretreatment system, a melting and refining system, and a casting system; magnesium alloy waste material passes in sequence through the pretreatment system, the melting and refining system, and the casting system, resulting in magnesium alloy ingots that conform to national standards. The production line for producing national-standard magnesium alloy ingots on the basis of magnesium alloy waste material processes magnesium alloy waste material, passing same through a pretreatment system, a preheating system a melting and refining system, a thermal insulation system, a casting system, and a post-treatment system; coatings and impurities on the surface of the magnesium alloy waste material are removed, and the material is processed into magnesium alloy ingots conforming to national standards; the pieces of equipment of each system are well-connected, the degree of automation is high, operation is simple, and production is highly efficient.

What is claimed is: 
     
         1 . A production line for producing GB-standard magnesium alloy ingots from magnesium alloy waste material, being characterized in comprising: a pretreatment system, a smelting-and-refining system, and a casting system that are in sequence connected,
 wherein the magnesium alloy waste material passes through the pretreatment system, the smelting-and-refining system, and the casting system in sequence to be converted into the GB-standard magnesium alloy ingots;   wherein the pretreatment system includes a high-pressure cleaning device and a pickling line.   
     
     
         2 . The production line of  claim 1 , wherein the pickling line comprises a batch-containing device, a pickling area, and a water-rinse area,
 wherein the batch-containing device contains the magnesium alloy waste material, and the pickling area is independent of the water-rinse area; and   wherein the material travels in the pickling line in such manner: after fed into the batch-containing device, the magnesium alloy waste material is sent by the batch-containing device to the pickling area and the water-rinse area for pickling and water rinse in sequence.   
     
     
         3 . The production line of  claim 1 , wherein the pickling line comprises a batch-containing device, a pickling area, a water-rinse area, and a hoisting device,
 wherein the batch-containing device contains the magnesium alloy waste material, and the pickling area is independent of the water-rinse area, and the hoisting device drives the batch-containing device to travel between the pickling area and the water-rinse area; and   wherein the material travels in the pickling line in such manner: after feeding the magnesium alloy waste material into the batch-containing device, the batch-containing device driven by the hoisting device enters the pickling area and the water-rinse area in sequence for pickling and water rinse respectively.   
     
     
         4 . The production line of  claim 2 , wherein the magnesium alloy waste material is pickled in the pickling area and rinsed in the water-rinse area, respectively, as the batch-containing device rotates. 
     
     
         5 . The production line of  claim 2 , wherein the batch-containing device is a power-driven drum, which power-driven drum contains the magnesium alloy waste material and is provided with a rotatory shaft passing through the drum. 
     
     
         6 . The production line of  claim 3 , wherein the hoisting device is a power-driven hoisting unit equipped with hooks, which hooks work with the hoisting elements of the batch-containing device to drive the batch-containing device to perform the operations of loading material, entering the pickling area, exiting the pickling area, entering the water-rinse area, exiting the water-rinse area or unloading material in sequence. 
     
     
         7 . The production line of  claim 2 , wherein the pickling area includes a pickling bath, an acid-in channel, and an acid-out channel,
 wherein the acid-in channel and the acid-out channel pass through the pickling bath and get communicated with the pickling bath, respectively.   
     
     
         8 . The production line of  claim 2 , wherein the water-rinse area includes a rinse unit, a material unloading unit and a spraying unit,
 wherein the pickled magnesium alloy waste material passes through the rinse unit, the material unloading unit, and the spraying unit in sequence, so that the rinse unit and the spraying unit perform double water rinse on the magnesium alloy waste material.   
     
     
         9 . The production line of  claim 8 , wherein the spraying unit includes a water pressurizer, a water nozzle, a spraying conveyer, and a spraying hood,
 wherein the water nozzles and the water pressurizer are disposed at one side of the spraying conveyer and the water nozzles and the water pressurizer are connected with each other, and the magnesium alloy waste material in the spraying unit is rinsed again by the water nozzle   wherein the spraying hood is a three-side hood covering the spraying conveyer's two laterals and top, and wherein the spraying conveyer is a vibrating conveyer board.   
     
     
         10 . The production line of  claim 2 , wherein the pickling line further comprises a dewatering-drying device, for dewatering and desiccating the pickled and water-rinsed material. 
     
     
         11 . The production line of  claim 2 , wherein the pickling line further comprises an automatic acid-changing/refilling system, which includes a pH meter, an Mg2+ concentration detector, an electric control valve, an acid-metering pump, a water-metering pump, and a control unit,
 wherein the portion of the pH meter, the Mg2+ concentration detector, and the electric control valve are disposed inside the pickling bath, while the portion of the acid-metering pump, the water-metering pump, and the control unit are disposed outside the pickling bath;   wherein the pH meter, the Mg2+ concentration detector, the electric control valve, the acid-metering pump, and the water-metering pump are in data connection with the control unit,   wherein the pH meter serves to regularly measure acidity of an acid solution in the pickling bath, the Mg2+ concentration detector serves to measure Mg2+ concentration in the pickling bath in a real-time manner, the pH meter and the Mg2+ concentration detector send signals to the control unit according to their measurement for controlling operations of the electric control valve, the acid-metering pump, and the water-metering pump by the control unit;   the electric control valve controls acid discharging via the acid-out channel, and the acid-metering pump controls acid charging via the acid-in channel.   
     
     
         12 . The production line of  claim 1 , wherein the high-pressure cleaning device in the pretreatment system acts as a preliminary washing apparatus before the magnesium alloy waste material is pickled, and the high-pressure cleaning device includes a revolvable perforated material-holding device and a high-pressure cleaning machine,
 wherein the magnesium alloy waste material is placed in the material-holding device so as to rotate with the material-holding device, and cleaning nozzles of the high-pressure cleaning machine generates high-pressure water to impact the waste evenly; and   in the pretreatment system, the magnesium alloy waste material is cleaned by the high-pressure cleaning device and then enters the pickling line for further cleaning.   
     
     
         13 . The production line of  claim 12 , wherein the cleaning nozzles of the high-pressure cleaning machine are arranged within the material-holding device and distributed evenly in an axial direction of the material-holding device. 
     
     
         14 . The production line of  claim 1 , wherein the pretreatment system further comprises a sorting device, for screening out impurities other than magnesium alloy waste material from the magnesium alloy waste material. 
     
     
         15 . The production line of  claim 14 , wherein the sorting device includes a first sorting unit and a second sorting unit,
 wherein the first sorting unit is disposed upstream the high-pressure cleaning device, and the second sorting unit is disposed downstream the pickling line;   wherein the material travels in the pretreatment system in such manner: the magnesium alloy waste material is sorted and has impurities removed by the first sorting unit sorting, and then is cleaned by the high-pressure cleaning device, enters the pickling line for further cleaning, and is sorted and has impurities removed again by the second sorting unit.   
     
     
         16 . The production line of  claim 1 , wherein the production line further comprises a pre-heating system that is located between the pretreatment system and the smelting-and-refining system, for further removing moisture from the magnesium alloy waste material that has been processed by the pretreatment system,
 wherein the magnesium alloy waste material is processed by the pretreatment system, and preheated by the pre-heating system before entering the smelting-and-refining system where the magnesium alloy waste material is refined into liquid magnesium alloy.   
     
     
         17 . The production line of  claim 1 , wherein the smelting-and-refining system includes a refining unit, a slag-skimming unit, and a liquid-transferring unit,
 wherein the slag-skimming unit can be placed into the refining unit, and the refining unit is connected to the liquid-transferring unit, so that liquid magnesium alloy generated from the smelting furnace is transferred into the casting system through the liquid-transferring unit.   
     
     
         18 . The production line of  claim 1 , wherein the casting system includes an ingot casting unit, a fixed-quantity pouring pump, and a pouring control unit,
 wherein liquid magnesium alloy is poured into the ingot casting unit by the fixed-quantity pouring pump, and the pouring control unit is connected to the ingot casting unit and the fixed-quantity pouring pump.   
     
     
         19 . The production line of  claim 1 , wherein the production line further comprises a environmental protection system including a waste-gas processing unit, a waste-residue processing unit and a waste-acid processing unit, which units are independent of each other, so that the waste-gas processing unit, the waste-residue processing unit, and the waste-acid processing unit process waste gas, waste residue, and waste acid generated in the entire pickling line, respectively. 
     
     
         20 . The production line of  claim 1 , wherein the production line includes a pretreatment system, a pre-heating system, a smelting-and-refining system, a temperature-holding system, and a casting system in sequence,
 wherein the magnesium alloy waste material is cleaned by the pretreatment system to remove impurities, after preheated by the pre-heating system the magnesium alloy waste material enters the smelting-and-refining system to be refined and/or alloyed into liquid magnesium alloy, which is then maintained at as liquid magnesium alloy by the temperature-holding system, and finally be casted into the GB-standard magnesium alloy ingots by the casting system.