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Method for preparing sulfuric acid by baking nickel-molybdenum ore in fluidized bed combustion boiler

A technology of fluidized fluidized furnace and nickel-molybdenum ore, which is applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of low product grade, poor quality of concentrated sulfuric acid, and large environmental pollution, and achieve good economic and social benefits. The effect of solving environmental pollution and reducing production costs

Active Publication Date: 2014-02-12
贵州华桂钼镍有限公司
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

However, the SO produced by the two processes 2 Flue gas, heavy environmental pollution, low product grade, S and C in nickel-molybdenum ore have not been utilized, and due to the existence of C, there is also the disadvantage of poor quality of concentrated sulfuric acid prepared
[0012] b. Wet process: use alkaline oxidizing reagent NaCLO+NaOH to decompose directly, or use nitric acid to decompose, and then produce a series of products such as ammonium molybdate from the leaching solution. The production cost is high, and the follow-up process is complicated. Among them, S and C Also not utilized, and due to the existence of C, there is also the shortcoming of the poor quality of the concentrated sulfuric acid prepared

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 100kg of nickel-molybdenum ore and 300kg of sulfur-containing minerals and mix them. After testing, the weight content of S in the mixed material is 28%, and the weight content of water is 10%. Air with an oxygen content of 30% (volume ratio) is roasted together to obtain furnace gas containing sulfur dioxide gas. After the furnace gas is dedusted and purified, sulfuric acid is obtained by contact method.

[0025] Wherein, during roasting, the boiling layer temperature in the fluidized furnace is 750°C, the pressure at the bottom of the fluidized furnace is 1000mmHg, and the outlet temperature of the fluidized furnace is 500°C.

[0026] After testing, the concentration of sulfur dioxide in the furnace gas was 8%. Sulfuric acid meets national standards.

Embodiment 2

[0028] Get 100kg of nickel-molybdenum ore and 10kg of sulfur to mix. After testing, the weight content of S in the mixed material is 27%, and the weight content of water is 8%. Air with an oxygen content of 20% (volume ratio) is roasted together to obtain furnace gas containing sulfur dioxide gas. After the furnace gas is dedusted and purified, sulfuric acid is obtained by contact method.

[0029] Wherein, during roasting, the boiling layer temperature in the fluidized furnace is 650°C, the pressure at the bottom of the fluidized furnace is 1300mmHg, and the outlet temperature of the fluidized furnace is 450°C.

[0030] After testing, the concentration of sulfur dioxide in the furnace gas was 6.8%. Sulfuric acid meets national standards.

Embodiment 3

[0032] Get 100kg of nickel-molybdenum ore to mix, after testing, the weight content of S in the material is 20%, the weight content of water is 5%, then this mixed material is placed in boiling furnace boiling roasting, passes into the boiling furnace with oxygen content of 40 % (volume ratio) of the air is roasted together to obtain furnace gas containing sulfur dioxide gas. After the furnace gas is dedusted and purified, sulfuric acid is obtained by contact method.

[0033] Wherein, during roasting, the boiling layer temperature in the fluidized furnace is 900°C, the pressure at the bottom of the fluidized furnace is 900mmHg, and the outlet temperature of the fluidized furnace is 660°C.

[0034] After testing, the concentration of sulfur dioxide in the furnace gas was 5.8%. Sulfuric acid conforms to the national industrial sulfuric acid primary standard.

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Abstract

The invention relates to a method for preparing sulfuric acid by baking nickel-molybdenum ore in a fluidized bed combustion boiler, belonging to the technical field of preparation of the sulfuric acid. The method comprises the following steps: mixing the nickel-molybdenum ore with a sulfur-containing material until the content of S by weight in the mixed material is 20-35 percent and the content of water by weight is 5-15 percent; placing the mixed material in the fluidized bed combustion boiler; introducing rich oxygen and roasting so as to obtain the sulfuric acid. The method has the beneficial effects that the production cost can be reduced, and the industrial sulfuric acid product which meets GB / T1534-2001 national standard is prepared.

Description

technical field [0001] The invention belongs to the technical field of preparing sulfuric acid, and in particular relates to a method for preparing sulfuric acid by roasting nickel-molybdenum ore in a fluidized fluidized furnace. Background technique [0002] The preparation methods of industrial sulfuric acid are mainly divided into smelting flue gas acid production, pyrite acid production, sulfur acid production and phosphogypsum acid production due to different raw materials. [0003] 1. Acid production from smelting flue gas [0004] With the rapid development of my country's non-ferrous metal industry, the treatment of smelting flue gas mainly uses the SO 2 In the production of sulfuric acid, copper, lead, zinc, nickel, gold, cobalt, molybdenum, chromium and other non-ferrous metals are mostly sulfide ores. During the smelting process, due to the high temperature reaction of sulfide ores, SO 2 The flue gas, the composition of the flue gas varies with the characteristi...

Claims

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Application Information

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IPC IPC(8): C01B17/50C01B17/76
Inventor 陈庭章谢轶丞谢伦钟本国谢鹏程
Owner 贵州华桂钼镍有限公司
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