Extraction of gold by heap leaching

Pump leaching is a process that grind gold mine with low grade to a certain particles , heap up on the leakage-proof bottom mat that concreted by pitch , concrete or plastic cloth , spray the low concentration cyanide solution , alkaline solution ， nontoxic solvent ， dilute sulphuric acid on the stock heap , make the gold dissolve ， the solution with gold heap up , then use active carbon to absorb or use zinc cementation to recover the gold .

Introduction
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Introduction

Application

Heap leaching is a process that use to treat the gold mine with low grade , cause it`s process simple , easy operation , low energy consumption , investment saving , effective . Scale can be choose , maximum scale can be million tons /day .

Technology process

Heap leaching process composes of concrete of the site , pre-process of the ore (crush or produce ) , concrete heap , spray leaching , disinfect and discharge the recovery of gold from pregnant solution .

Raw ore processing

After the raw ore grinded by jaw crusher and cone crusher ,the particles become (30-50mm) , put them to concrete directly ;fine particles need to be produce (make the fine particles become the rough particles ) ， then transport the mineral by forklift truck to the concrete heap .

Spray system :

put a spray system above the heap .After cyanide solution and heap reacted , the pregnant solution exude from the heap and flow into pregnant tank , then infiltrate into absorption column by the pregnant solution pump , the solution rest is barren solution , barren solution return to spray system for recycling .

desorption and electro winning :

with high temperature and high pressure in the desorption and electro wining , the gold pulp come out , after smelting , come out the gold bullion .

The main equipment in heap leaching that including : jaw crusher , cone crusher , spray device ， desorption and electro wining , smelting device etc .

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