Production method for preparing sulfuric acid from molybdenum concentrate

Abstract

The invention relates to a production method for preparing sulfuric acid from a molybdenum concentrate, belonging to the technical field of chemical metallurgy. The production method comprises the following steps that a molybdenum concentrate is subjected to size mixing and then enters a first fluidized bed furnace for roasting for the first time so as to remove most of sulfur; slag discharged from the first fluidized bed furnace and dust collected by a dust collector enter a second fluidized bed furnace or a rotary kiln for fine desulfurization roasting so as to realize further desulfurization and increase the content of soluble molybdenum; and flue gas of the first fluidized bed furnace enters a sulfuric acid production system after being cooled and dedusted, and then sulfuric acid is produced by adopting a closed pickling purification and one-conversion one-absorption or two-conversion two-absorption steady-state acid production method. A roasted product of the molybdenum concentrate is low in sulfur content and greatly increased in the content of soluble molybdenum; the concentration of sulfur dioxide in flue gas generated by roasting is high; and acid can be directly preparedby adopting a steady-state technology. The method is small in occupied area, low in labor intensity, low in operation cost, smooth in process, complete in control means and good in reliability and safety.

Description

technical field [0001] The invention relates to a production method for producing sulfuric acid from molybdenum concentrate, which belongs to the technical field of chemical metallurgy and is suitable for producing sulfuric acid with molybdenum concentrate as raw material. Background technique [0002] On June 21, 2012, China Molybdenum Industry Group Metal Materials Co., Ltd. applied for the "Multi-hearth furnace carbon-free roasting molybdenum concentrate process and device" (patent number: ZL201210207434.X) to disclose a multi-hearth furnace carbon-free roasting molybdenum concentrate However, this method is mainly used in the multi-hearth furnace process. The equipment structure is complex, the equipment failure rate is high, the maintenance workload is large, the material is easy to sinter, and the temperature is not easy to control. [0003] Changsha Nonferrous Metallurgical Design and Research Institute Co., Ltd. applied for "Fluidized Roasting Furnace Suitable for Mo...

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Problems solved by technology

[0016] In view of the above problems, the present invention provides a complete set of molybdenum concentrate roasting process - a production method for producing sulfuric acid from molybdenum concentrate, the purpose of which is to solve the problem of roasting molybdenum concentrate in the existing molybdenum concentrate roasting process and equipment. External heat source is required to provide heat, the amount of roasting flue gas is too large, the concentration of SO2 in roasting flue gas is low, it is difficult to make acid, the equipment occupies a large area, the operating cost is high, the labor is large, and the mine loss is large, etc.