Copper sulfate is an important basic chemical raw materials and widely used in the field of pesticides, feed additives, electroplating, electronics, medicine, etc.

At present, the main raw material for the preparation of copper sulfateis copper or scrap copper.If to make high purity copper sulfate, the normal practice now is to dissolve crude copper sulfate  in water thenfiltered to recrystallized including concentration crystallization and cooling crystallization.Concentrated crystallization will  result in high energy consumption and high cost, because large specific heat of water,  at the same time,  impurity concentration increased withevaporation of water, and bad cleaning effect;Cooling crystallization will lead to low efficiency, low production and high cost. High sulfate content of the mother liquor, if recycled mother liquor, the impurity concentration gradually increased, if recycled, the product yield is low, the cost will be higher.

Using copper PCB waste to make copper sulfate is also an important way to reduce cost. However, this waste contains many impurities, such as arsenic, lead, calcium, iron, etc. Therefore, this type copper sulfate is often with high impurity , and low  purity, generally only reach about 96% -98% and chloride content generally have hundreds or even thousands ppm, which unable to meet the customer high requirementsof product quality .

The object of this invention is to overcome the deficiency of the present technology, and to provide a method of utilizing copper circuit board liquid waste to produce high purity copper sulfate, which is low cost, high efficiency, low energy consumption, well effect of cleaning impurity, high purity of the finished product.

Feature of the invention is to make the traditional preparation of the crude copper sulfate and recrystallization copper sulfate into one process, reducing the process to improve the efficiency; Meanwhile, integrating three steps of highly efficient impurity removal in the process to improve product purity effectively. At the same time in the preparation of copper sulfate process, you can control the size of the final product particle to meet different customer requirements, so the process has good social and economic benefits.

We have applied for patent protection for the technology, patent application number: 201210312805.0