: 16 Roasting converts the zinc sulfide concentrate to zinc oxide:

  
    
      
        
          2
          
          ZnS
          +
          3
          
          
            O
            
              2
            
            
              
            
          
          
            
              →
              
                
                  t
                  o
                
              
            
          
          2
          
          ZnO
          +
          2
          
          
            SO
            
              2
            
            
              
            
          
        
      
    
    {\displaystyle {\ce {2ZnS + 3O2 ->[t^o] 2ZnO + 2SO2}}}
  The sulfur dioxide is used for the production of sulfuric acid, which is necessary for the leaching process.
Cefixime, sold under the brand name Suprax among others, is an antibiotic medication used to treat a number of bacterial infections. These infections include otitis media, strep throat, pneumonia, urinary tract infections, gonorrhea, and Lyme disease. For gonorrhea typically only one dose is required. In the United States it is a second-line treatment to ceftriaxone for gonorrhea. It is taken by mouth.Common side effects include diarrhea, abdominal pain, and nausea. Serious side effects may include allergic reactions and Clostridium difficile diarrhea. It is not recommended in people with a history of a severe penicillin allergy. It appears to be relatively safe during pregnancy. It is in the third-generation cephalosporin class of medications. It works by disrupting the bacterias cell wall resulting in its death.Cefixime was patented in 1979 and approved for medical use in the United States in 1989. It is on the World Health Organizations List of Essential Medicines. It is available as a generic medication in the United States. Medical uses
Cefixime treats infections of the:

Urinary tract: Uncomplicated urinary tract infections caused by susceptible isolates of Escherichia coli and Proteus mirabilis. Ear: Otitis media caused by Haemophilus influenzae, Moraxella catarrhalis and Streptococcus pyogenes. Throat: Tonsillitis and pharyngitis caused by Streptococcus pyogenes. Chest and lungs: Chronic bronchitis caused by Streptococcus pneumoniae and Haemophilus influenzae. Cervix and urethra: Gonorrhea (cervical/urethral) caused by susceptible isolates of Neisseria gonorrhoeae (penicillinase-and non-penicillinase-producing isolates). Skin and soft tissue infection: effective against group A and B beta-hemolytic streptococci.