Method for recovering sulfuric acid from copper raffinate
A raffinate, sulfuric acid technology, applied in sulfur trioxide/sulfuric acid, chemical instruments and methods, sulfur compounds, etc., can solve the problems of large amount of neutralizing agent, large amount of neutralized slag, and failure to recycle sulfuric acid, etc. The effect of improving economic efficiency
Inactive Publication Date: 2017-10-10
厦门紫金矿冶技术有限公司
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Problems solved by technology
[0004] The purpose of the present invention is to provide a method for recovering sulfuric acid from copper extract to solve the problems in the prior art that copper raffinate treatment produces a large amount of neutralization slag, the amount of neutralizer is large, and sulfuric acid cannot be recycled.
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[0021] figure 1 It is a flow chart of a method for reclaiming sulfuric acid from copper raffinate of the present invention. The specific method of the present invention consists of figure 1 and its description. Such as figure 1 Specifically, the following steps are shown:
[0022] Step 1: Pump the copper raffinate that needs to be treated in an open circuit into a filter device to filter out solid matter, and obtain a copper raffinate with a suspended matter concentration of less than 5 mg / L. The sulfuric acid content of the copper raffinate that requires open circuit treatment is 5-20g / L, the metal ion content is 5-20g / L, the metal ions include iron, aluminum, copper, zinc and calcium, and the calcium ion content is 100-20g / L. 500mg / L; preferably, the content of sulfuric acid is 8-15g / L, the content of metal ions is 7-15g / L and the content of calcium ions is 200-400mg / L. The filtering device is a sand filter, a fiber ball filter, a fiber bundle filter or a security filte...
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The invention discloses a method for recovering sulfuric acid from copper raffinate. The method comprises the following steps: removing suspended solids in the copper raffinate by a filtering device, removing oil through an oil removal device, and removing calcium, iron, copper and other metal ions through a calcium-removing resin column and a nanofiltration device so as to obtain a low-concentration sulfuric acid solution; concentrating through a reverse osmosis device so as to obtain a high-concentration sulfuric acid concentrated solution; and recovering the obtained sulfuric acid, and supplementing a small amount of extra fresh sulfuric acid to be used for reverse extraction of copper. The problems that lots of neutralizers need to be consumed and lots of neutralization residues are produced during treatment of the traditional copper raffinate are solved. The method disclosed by the invention has important significance on reduction treatment and recycling of sulfuric acid in a wet copper smelter, and the economic benefits of enterprises are improved.
Description
technical field [0001] The invention relates to the field of metal mine wastewater treatment, in particular to a method for recovering sulfuric acid from copper raffinate. Background technique [0002] At present, the annual output of copper produced by the "leaching-extraction-electrowinning" wet copper smelting process in the world is 4.5 million to 5 million tons, accounting for about 20% to 25% of the global copper production. With the gradual depletion of copper resources and social 2 Due to widespread concern about environmental pollution, the proportion of hydrometallurgy will further increase. [0003] The wet copper smelting process will produce a large amount of copper raffinate, which usually contains a large amount of sulfuric acid, iron and a small amount of metal ions such as copper, zinc, and arsenic. Since the raffinate is acidic and contains heavy metal ions, it cannot be discharged directly. Generally, the copper raffinate is recycled to the leaching pro...
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IPC IPC(8): C02F9/04C01B17/90C02F101/10C02F101/20C02F103/16
CPCC01B17/901C02F1/001C02F1/285C02F1/40C02F1/441C02F1/442C02F9/00C02F2101/10C02F2101/20C02F2101/203C02F2103/16C02F2301/08
Inventor 方荣茂朱秋华林鸿汉
Owner 厦门紫金矿冶技术有限公司