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A kind of manganese slag collaborative calcium chloride waste slag recycling treatment method

A treatment method and technology of calcium chloride, applied in manganese halide, cement production and other directions, can solve the problems of unrealized bulk consumption of solid waste, low chlorination reaction efficiency, unsuitable electrolytic manganese slag, etc.

Active Publication Date: 2021-11-02
CHANGSHA SCI ENVIRONMENTAL TECH
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Problems solved by technology

[0006] The Chinese patent application with the application number CN201910588744.2 discloses a method for producing manganese carbonate and iron powder by chlorination reduction roasting of ferromanganese ore. Anhydrous magnesium chloride, anhydrous calcium chloride, carbonaceous reducing agent and ferromanganese ore powder are evenly mixed The mixture is obtained, and all mixtures are reduced and roasted at one time, and the reduced product is obtained after cooling. This method is to separate and recover iron and manganese for high-iron manganese materials, and finally obtain manganese carbonate and iron powder, but the process waste is secondary waste. Realize bulk consumption of solid waste
And in the reaction process, the ionic anhydrous chlorine salt is directly used as the reactant of the chlorination reaction and the high-iron manganese raw material is subjected to a high-temperature and strong reduction reaction. Due to the stable structure of the chloride salt, the efficiency of the chlorination reaction is not high; and in the reduction and chlorination In the mixed high-temperature reaction system, the iron in the high-iron-manganese material will be rapidly chlorinated into ferric chloride prior to manganese. The boiling point of ferric chloride is only 316°C, and the ferric chloride with a low boiling point will quickly volatilize into the fume gas Dispersion, consumption of a large amount of chlorinating agent, resulting in a reduction in the recovery rate of manganese chlorination, so that a large amount of manganese still remains in the final secondary waste residue
[0007] Therefore, this kind of manganese recovery method for high iron manganese ore is not suitable for electrolytic manganese slag

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  • A kind of manganese slag collaborative calcium chloride waste slag recycling treatment method
  • A kind of manganese slag collaborative calcium chloride waste slag recycling treatment method
  • A kind of manganese slag collaborative calcium chloride waste slag recycling treatment method

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Embodiment 1

[0044] Such as figure 1 As shown, in step S1 of this embodiment, 1 ton of manganese slag is weighed, and 200 kg of standard coal pulverized coal is mixed evenly to form a mixture A, and the mixture A is added to a reduction roasting kiln through a screw feeder, and air is introduced into the kiln to raise the temperature to 1200°C and stay in this temperature range for 150min.

[0045] The main components of the manganese slag managed by the present embodiment are calcium sulfate, silicon dioxide and a small amount of manganese trioxide, etc., such as figure 2 As shown in the XRD phase spectrum of the manganese slag, the element content of each component in the manganese slag is shown in Table 1, and the corresponding element content of each component in the manganese slag is expressed by oxides in the table (calcium is expressed by CaO, and sulfur is expressed by SO 3 form, manganese is represented by the MnO form).

[0046] Table 1 Main components of electrolytic mangane...

Embodiment 2

[0055] The present embodiment selects manganese slag and calcium chloride with the same composition as in Embodiment 1.

[0056] Step S1 of this embodiment weighs 1 ton of manganese slag, mixes it into 100 kg of standard coal coal powder and mixes it evenly to form a mixture A, and then puts the mixture A into the reduction roasting kiln through a screw feeder, and the temperature of the kiln is raised to 800° C. And stay in this temperature range for 60 minutes.

[0057] Step S2 takes by weighing 520kg of calcium chloride waste residue with a water content of 20% and 32kg of quartz sand and uniformly mixes it into a mixture B, the mass ratio of calcium chloride in the mixture B to silica in the quartz sand is 2:1, and the reduced The roasted product is directly added to the chlorination roasting kiln, and the mixture B is added to the chlorination roasting kiln at the same time. The mass ratio of the calcium chloride in the mixture B to the manganese monoxide in the reduction...

Embodiment 3

[0062] The present embodiment selects manganese slag and calcium chloride with the same composition as in Embodiment 1.

[0063] Such as figure 1 As shown, in step S1 of this embodiment, 1 ton of manganese slag is weighed, and 150 kg of standard coal pulverized coal is mixed evenly to form a mixture A, and the mixture A is added to a reduction roasting kiln through a screw feeder, and air is introduced into the kiln to raise the temperature to 1000°C and stay in this temperature range for 120min.

[0064] Step S2 takes by weighing 630kg of calcium chloride waste residue with a moisture content of 30% and 50kg of quartz sand and evenly mixes it into a mixture B, the mass ratio of calcium chloride in the mixture B to silica in the quartz sand is 1.5:1, and the reduced The roasted product is directly added to the chlorination roasting kiln, and the mixture B is added to the chlorination roasting kiln at the same time. The mass ratio of the calcium chloride in the mixture B to th...

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Abstract

The invention discloses a manganese slag and calcium chloride waste slag recycling treatment method. The manganese slag and calcium chloride waste slag are roasted in two stages to realize the synergistic recycling method. Calcium chloride, silicon dioxide and water vapor in the air are utilized. The reaction characteristics of calcium silicate and hydrogen chloride are formed at high temperature. The manganese slag containing the low-valent manganese phase formed by reduction roasting is mixed with the above materials to carry out high-temperature chlorination roasting, and the roasted product is separated by water leaching to obtain manganese chloride, and obtain The water leaching residue composed of calcium silicate, calcium sulfate and silica mixture realizes the synergistic utilization of manganese residue and calcium chloride waste residue, improves the resource value of the above solid waste, has high economic benefits, and reduces the For the environmental pollution caused by the separate treatment of the corresponding solid waste, the entire treatment process is simple and easy to implement, and the energy consumption is low, which can be widely used in the electrolytic manganese industry.

Description

technical field [0001] The invention belongs to resource utilization of smelting waste slag, and in particular relates to a resource treatment method of manganese slag in cooperation with calcium chloride waste slag. Background technique [0002] In the production process of electrolytic manganese dioxide, after manganese carbonate is leached by sulfuric acid, a large amount of electrolytic manganese dioxide slag (hereinafter referred to as "manganese slag") will be produced in the lime neutralization stage, and every ton of manganese dioxide produced will produce about 4 tons of manganese slag, except the main component calcium sulfate and a small amount of manganese oxide in the manganese slag. [0003] At present, the main bulk disposal method of manganese slag is landfill, especially in areas such as Guizhou Province, where the geographical conditions of hilly and mountainous areas are conducive to the construction of landfills with a level of one million tons or even te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/06C04B7/147C04B7/24
CPCC01G45/06C04B7/147C04B7/24Y02P40/10
Inventor 孟云蒋国民刘永丰闫虎祥齐伟王凯赵淑宏廖圆高伟荣
Owner CHANGSHA SCI ENVIRONMENTAL TECH
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