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An inorganic salt hazardous waste resource treatment process

A treatment process and resource recovery technology, applied in the field of environmental protection, can solve the problems of adsorbent loss, difficult treatment, blockage of inorganic salt melting pipeline, etc.

Active Publication Date: 2022-06-07
内蒙古中泰汇金环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the incinerators equipped by hazardous waste incineration and disposal enterprises did not consider the problems of inorganic salt melting, equipment corrosion, and pipeline blockage that may be caused by waste slag salt treatment at the beginning of the design, the treatment is difficult, resulting in a large amount of slag salt in the area. It exists in the enterprise factory, which seriously restricts the production and operation of the enterprise, and it is urgent to find a more suitable comprehensive treatment method for slag and salt
[0010] The existing technology uses modified bagasse as the adsorbent, because too many cycles will cause serious loss of the adsorbent, and the prior art records no more than 5 times of use, and the adsorbent cannot be used repeatedly for a long time, resulting in higher adsorption costs

Method used

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  • An inorganic salt hazardous waste resource treatment process
  • An inorganic salt hazardous waste resource treatment process

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A process for recycling hazardous waste of inorganic salts, the technical scheme of which comprises the following steps:

[0031] Step 1, feeding treatment, firstly transport the slag salt to the pretreatment workshop, mix the material in the mixing tank, and then crush it by the crusher and transport it to the feeding hopper, and then use the closed screw conveyor to send it to the negative pressure The dryer is dried at 150°C, and the moisture content of the slag salt is controlled at 0.1%;

[0032] Step 2, high temperature oxidation, the dried slag salt enters the oxidation furnace, and is calcined at a high temperature of 450 ° C for 60 s, and then further oxidized and calcined by the rotary oxidation furnace;

[0033] Step 3: Refining the waste salt, sending the high-temperature oxidized crude salt into the dissolving kettle through a screw conveyor, adding water to the dissolving kettle, making the crude salt into 310g / L saturated brine with a temperature of 50°C,...

Embodiment 2

[0042] A process for recycling hazardous waste of inorganic salts, the technical scheme of which comprises the following steps:

[0043] Step 1, feeding treatment, firstly transport the slag salt to the pretreatment workshop, mix the material in the mixing tank, and then crush it by the crusher and transport it to the feeding hopper, and then use the closed screw conveyor to send it to the negative pressure The dryer is dried at 180°C, and the moisture content of the slag salt is controlled at 0.5%.

[0044] In step 2, high temperature oxidation, the dried slag salt enters the oxidation furnace, and is calcined at a high temperature of 480 ° C for 90 s, and then further oxidized and calcined by the rotary oxidation furnace;

[0045] Step 3: Refining the waste salt, sending the crude salt oxidized at high temperature into the dissolving kettle through a screw conveyor, adding water to the dissolving kettle, making the crude salt into 450g / L saturated brine with a temperature of...

Embodiment 3

[0054] A process for recycling hazardous waste of inorganic salts, the technical scheme of which comprises the following steps:

[0055] Step 1, feeding treatment, firstly transport the slag salt to the pretreatment workshop, mix the material in the mixing tank, and then crush it by the crusher and transport it to the feeding hopper, and then use the closed screw conveyor to send it to the negative pressure The dryer is dried at 250°C, and the moisture content of the slag salt is controlled at 1%;

[0056] In step 2, high temperature oxidation, the dried slag salt enters the oxidation furnace, and is calcined at a high temperature of 500 ° C for 120 s, and then is further oxidized and calcined by the rotary oxidation furnace;

[0057] Step 3: Refining the waste salt, sending the crude salt after high temperature oxidation into the dissolving kettle through a screw conveyor, adding water to the dissolving kettle, making the crude salt into 650g / L saturated brine with a temperat...

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Abstract

The invention relates to the field of environmental protection treatment, and specifically relates to a process for recycling inorganic salt hazardous waste; its main steps include feed treatment, high-temperature oxidation, waste salt refining treatment and evaporation crystallization. The present invention uses a "negative pressure drying + multi-layer suspension oxidation furnace + high temperature rotary oxidation furnace" process to recycle dangerous inorganic salt wastes. Compared with the traditional industrial slag salt high temperature heat treatment process, this process can efficiently remove organic matter and effectively Solve the problem of melting and agglomeration of inorganic salts that may exist at high temperatures, corrosion of high-temperature refractory materials, and cooling and clogging of pipelines during the refining of inorganic salts; using a urea-based modified bagasse adsorbent can effectively remove residues in the salt solution Trace amount of organic matter, using the "negative pressure drying + high temperature liquefaction oxidation furnace" process, can ensure the high temperature decomposition rate of organic matter in slag salt, melting and agglomeration problems.

Description

technical field [0001] The invention relates to the field of environmental protection treatment, in particular to a process for recycling hazardous waste of inorganic salts. Background technique [0002] With the continuous development of chemical enterprises in Binhai and surrounding areas and the gradual strengthening of environmental protection supervision, the production of industrial slag salt is increasing, which continues to restrict the development of enterprises. Industrial slag salt is a kind of salt containing sodium chloride slag, sodium sulfate slag salt, mixed salt of sodium chloride and sodium sulfate, which comes from pesticide, medicine, fine chemical industry and other industries. There are different organic substances, insoluble substances and a small amount of heavy metals, etc., which are hazardous wastes. [0003] Sugarcane is one of the main raw materials for sugar production. About 50% of the fiber left in bagasse after sugar extraction can be used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F9/04B09B3/35B09B3/00B09B3/40B09B3/70B09B3/38B09B3/30
CPCB01J20/24C02F9/00B09B3/00B09B5/00B01J2220/4887C02F1/286C02F1/444C02F1/56C02F1/722B09B3/40
Inventor 陈红利苏文佳
Owner 内蒙古中泰汇金环保科技有限公司
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