Comprehensive utilization method and device for copper-containing sulfuric acid cool baking slag
A technology of sulfuric acid slag and sulfuric acid, which is applied in chemical instruments and methods, wet separation, solid separation, etc., can solve problems such as difficulty in industrial production control, and achieve easy treatment and discharge standards, good economic benefits, and high combustion utilization. Effect
Inactive Publication Date: 2008-07-02
TONGLING NONFERROUS DESIGN & RES INST
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Problems solved by technology
The above research was obtained under laboratory conditions. Since the reduction of copper has strict requirements on the reaction atmosphere, it has brought great difficulties to the control of industrial production. Up to now, there has been no successful example of using the segregation method to treat sulfuric acid slag in China.
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[0041] The sulfuric acid slag selected in this embodiment is taken from the Tongling industrial area, and its main components are: Fe 48-53%, Cu 0.3-0.7%, Au 0.5-1.5 g / t, Ag 4-50 g / t.
[0042] As shown in Figure 1, the cold slag taken from the storage yard is continuously added to the fluidized bed preheating furnace, the bituminous coal powder is sprayed into the furnace, the material is heated to 900~950℃, and the fluidization of the preheating furnace is controlled. The fluidization speed of the bed makes the soot rate of the heating furnace below 60%. The outlet of the heating furnace is designed with a two-stage high-temperature and high-efficiency cyclone dust collector and a heat exchanger, and the dust collection efficiency can reach more than 95%. The high-temperature flue gas discharged from the second-stage dust collector is passed into the heat exchanger to preheat the fluidized medium fresh air sent to the preheating furnace. It can be preheated to about 500°C, which ...
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Abstract
The invention discloses a comprehensive utilization method of copper-containing cold pyrite cinder and a device. The method comprises the following steps of: heating pyrite cinder to 900 to 950 DEG C, conveying to a rotary kiln, adding industrial salt and coke powder or smokeless coal powder into the kiln, respectively having an amount of 0.5 to 1.2% and 2 to 4% the weight of the pyrite cinder, keeping the baking temperature in the kiln at 780 to 820 DEG C, and baking for 60 to 90 min; and water-quenching the baked materials, ball-grinding, recovering copper concentrate containing Au and Ag by floatation, and magnetically selecting high-quality iron concentrate from the flotation tailing. The invention can process the pyrite cinder by adopting a two-stage segregation process and can carry out heating and segregation reactions in segments, which facilitates the control of the rear-segment reaction conditions. The materials and additives sufficiently contact each other to ensure good processing effect and high recovery rates of Fe, Cu, Au and Ag. The invention good economic benefit, and can be used for large-scale industrial processing.
Description
Technical field [0001] The invention relates to a method for comprehensive utilization of copper-containing sulfuric acid slag, in particular to a comprehensive utilization method for obtaining high-grade iron concentrate through chlorination roasting treatment and recovering copper-based precious metals. Background technique [0002] Sulfuric acid slag (also known as sulphuric acid slag, pyrite slag, pyrite slag) produced in the process of sulfuric acid production is one of the main solid wastes produced in the chemical industry. Usually 0.8~1.5t of pyrite slag is discharged for every 1t of sulfuric acid produced, and the annual discharge is about 7×10 in the country. 6 t, accounting for 1 / 3 of chemical waste residue. Since my country generally uses low-grade pyrite-containing iron ore to make acid, the iron content in the sulfuric acid slag is generally low, generally about 30-50%, and the highest is not more than 55%. Due to the low iron content, the economic effect of direct ...
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IPC IPC(8): C22B1/00C22B1/02C22B1/14B03B7/00B03B1/00B03C1/02
Inventor 姚忠吉戴升弘陈锦安姚群阮胜寿
Owner TONGLING NONFERROUS DESIGN & RES INST