Lime neutralization, can substantially remove the copper heap leaching of hazardous waste in the waste water, the waste water quality standard reached efflux. The problem is that the sludge produced by the neutralization of lime is plastically large, difficult to store, and prone to secondary pollution. In order to facilitate the disposal of the slag, the key is to change the form of the slag, or to avoid the occurrence of a large amount of hydrolyzed products of iron . The following two methods are recommended:
First, in the uranium ore acid method heap leaching wastewater treatment method, the strontium chloride deionization-sludge cycle-step neutralization method was introduced. After eliminating the step of adding ruthenium chloride to the method, the process of the remaining steps is completely suitable for the treatment of copper heap heap leaching wastewater. (See the uranium ore acid method heap leaching wastewater treatment method http://)
Second, the combined precipitation method. Since the iron content of the copper sulfide ore heap is very high, the hydrolysis product of iron has a great influence on the performance of the lime neutralization sludge. The principle of the combined precipitation method is to make a large amount of iron in the wastewater to produce iron slag at a higher acidity (lower pH), that is, at pH 1.7, and the reaction is
3Fe 2 (SO 4 ) 3 +6Na 2 CO 3 +6H 2 O 
Na 2 Fe 6 (SO 4 ) 4 (OH) 12 +6CO 2 +5Na 2 SO 4
Or the formation of goethite FeO(OH) precipitate at pH 4. The precipitates of these two forms are all crystalline, and can be stably present in a weak acid medium, and have good filtration performance and are convenient for storage. After most of the iron in the wastewater has settled, it is continuously neutralized with lime to pH 7. At this time, a small amount of iron waste and heavy metal ions milligram hydrolysis precipitation. The quality of the wastewater treated in this way has reached the efflux standard; and most of the components in the slag are crystalline iron or goethite with only a small amount of hydrolyzed products, thus solving the filtration, transportation and storage of the slag. Difficulties in other aspects.
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