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May 30, 2018 The most common method for recycling dry and hardened concrete involves crushing. Mobile sorters and crushers are often installed on construction sites to allow on-site processing. In other situations, specific processing sites are established, which are usually able to produce higher quality aggregate . The best Clay lumps 2.0 , Sieve.Apr 25, 2017 The Importers Of Quartz . A per the reports produced by the Observatory of Economic Complexity (OEC) Russia is the top importer of quartz at 12 , the only country to be over 10 . The next countries that import the most quartz are China (6.9 ), the United States (6.7 ), Japan (6.3 ), Norway (6.2 ) and South Korea (6.0 ). The top quartz importer in South America is Venezuela (1.4 ).