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Rotary kiln device for sodium dichromate production by calcium-free calcination

A sodium dichromate, calcium-free roasting technology, applied in the field of rotary kiln, can solve the problems of shortening the oxidative roasting time and low production efficiency, and achieve the effects of shortening the oxidative roasting time, improving the production capacity and low power consumption

Active Publication Date: 2013-05-08
HUBEI ZHENHUA CHEMICAL CO LTD
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AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the problems of the furnace charge ring (nodules) and low production efficiency in the existing technology of chromite calcium-free roasting-sulfuric acid acidification sodium dichromate production process, and provide a calcium-free roasting production heavy The rotary kiln device for sodium chromate adopts the technical scheme of the present invention, which greatly improves the productivity of the rotary kiln, shortens the oxidation and roasting time, and has good economic benefits and development prospects

Method used

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  • Rotary kiln device for sodium dichromate production by calcium-free calcination
  • Rotary kiln device for sodium dichromate production by calcium-free calcination
  • Rotary kiln device for sodium dichromate production by calcium-free calcination

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Embodiment 1

[0031] combine figure 1 , a kind of calcium-free roasting of the present embodiment produces the rotary kiln device that sodium dichromate is used, comprises kiln body 1, top tuyere device 21, side tuyere device 22, bottom tuyere device 23, feed end burner 31, Discharge end burner 32, feeding port 4, siphon high outlet 5, transmission device 6, ring gear 7, flue gas outlet 8, siphon flue 12, fixed flue 13, end cover 10, slag discharge port 11 and spray gun.

[0032] The kiln body 1 of this embodiment is a horizontal rotary kiln with a diameter of φ2.15×9m. The length-to-diameter ratio of the kiln body 1 is 4.2. In the present invention, the length-to-diameter ratio of the kiln body 1 is designed to be 3~6, ​​which is a One of the key improvement points, compared with the conventional rotary kiln with length-to-diameter ratio of 15-20, it is significantly shortened, resulting in less heat dissipation and concentrated heat, which reduces fuel consumption by more than 20%, and t...

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Abstract

The invention discloses a rotary kiln device for sodium dichromate production by calcium-free calcination, and belongs to the technical field of a rotary kiln. The length-diameter ratio of the kiln body is 3-6, wherein the feed end is provided with a feed port, a feed end burner and a smoke outlet, and the discharge end is provided with a siphon high-level outlet, a slag tap and a discharge end burner; a bottom blow-off nozzle device is arranged at the bottom of the kiln body, lateral blow-off nozzle devices are symmetrically arranged at two sides of the kiln body, a top blow-off nozzle device is arranged on the top of the kiln body, and the lengths of the arranged top blow-off nozzle device, the lateral blow-off nozzle devices and the bottom blow-off nozzle device are respectively 30 to 70 percent of the length of the kiln body; the top blow-off nozzle device, the lateral blow-off nozzle devices and the bottom blow-off nozzle device are horizontally arranged and respectively connected with a spray gun; and a power mechanism is arranged on the kiln body, and comprises a transmission device and a gear ring. According to the rotary kiln device, the oxidation reaction time is remarkably shortened, the production capacity is remarkably improved, the production cost is greatly reduced, and the chromite oxidation rate is high, so that an industrial scale can be easily formed.

Description

technical field [0001] The invention relates to the technical field of rotary kilns, and more specifically relates to a rotary kiln device for producing sodium dichromate by calcium-free roasting. Background technique [0002] Sodium dichromate is the most important product in the chromium salt industry. As a basic chemical raw material, it is widely used in chemical industry, light industry, printing and dyeing, medicine and other industries. It can be further processed into chromium salt series such as chromic anhydride, chromium hydroxide, basic chromium sulfate, etc. Products, used in metallurgy, machinery, building materials, petroleum, leather, electroplating, pigments, daily hardware and other industries, occupy an important position in the national economy. The basic production process of sodium dichromate is chromite oxidation roasting-sulfuric acid acidification method . [0003] The traditional production process of sodium dichromate is as follows: chromite is ro...

Claims

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Application Information

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IPC IPC(8): C01G37/14
Inventor 石大学
Owner HUBEI ZHENHUA CHEMICAL CO LTD
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