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Resource treatment process for inorganic salt hazardous wastes

A treatment process and inorganic salt technology, applied in the field of inorganic salt hazardous waste resource treatment process, can solve the problems of adsorbent loss, difficult treatment, high adsorption cost, etc., increase specific surface area, improve adsorption effect, and solve environmental protection problems Effect

Active Publication Date: 2020-02-07
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

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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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  • Resource treatment process for inorganic salt hazardous wastes
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Examples

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Effect test

Embodiment 1

[0030] A resource treatment process for inorganic salt hazardous waste, and its technical scheme includes the following steps:

[0031] Step 1. Feeding treatment. Firstly, the slag salt is transported to the pretreatment plant, mixed in the mixing tank, and then crushed by the crusher and transported to the feed hopper, and then sent to the negative pressure by the closed screw conveyor The dryer is dried at 150℃ to control the moisture content of the slag salt at 0.1%;

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

[0033] Step three, waste salt refining treatment, the high-temperature oxidized coarse salt is sent to the dissolving kettle through a screw conveyor, water is added to the dissolving kettle, the coarse salt is prepared into 310g / L saturated brine with a temperature of 50℃, and the solut...

Embodiment 2

[0042] A resource treatment process for inorganic salt hazardous waste, and its technical scheme includes the following steps:

[0043] Step 1. Feeding treatment. Firstly, the slag salt is transported to the pretreatment plant, mixed in the mixing tank, and then crushed by the crusher and transported to the feed hopper, and then sent to the negative pressure by the closed screw conveyor The dryer is dried at 180°C, and the moisture content of the slag salt is controlled at 0.5%.

[0044] Step two, 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 is further oxidized and calcined in a rotary oxidation furnace;

[0045] Step three, waste salt refining treatment, the high-temperature oxidized coarse salt is sent to the dissolving kettle through a screw conveyor, water is added to the dissolving kettle, and the coarse salt is made into 450g / L saturated brine with a temperature of 505°C and disso...

Embodiment 3

[0054] A resource treatment process for inorganic salt hazardous waste, and its technical scheme includes the following steps:

[0055] Step 1. Feeding treatment. Firstly, the slag salt is transported to the pretreatment plant, mixed in the mixing tank, and then crushed by the crusher and transported to the feed hopper, and then sent to the negative pressure by the closed screw conveyor The dryer is dried at 250°C to control the moisture content of the slag salt at 1%;

[0056] Step 2: High-temperature oxidation, the dried slag salt enters the oxidation furnace, and is calcined at a high temperature of 500°C for 120s, and then undergoes further oxidation and calcining treatment in a rotary oxidation furnace;

[0057] Step three, waste salt refining treatment, the high-temperature oxidized coarse salt is sent to the dissolving kettle through a screw conveyor, water is added to the dissolving kettle, the coarse salt is prepared into saturated brine at 650g / L and the temperature is 60℃,...

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Abstract

The invention relates to the field of environmental protection treatment, in particular to a resource treatment process for inorganic salt hazardous wastes; and the main steps comprise feed treatment,high-temperature oxidation, waste salt refining treatment and evaporative crystallization. According to the process, the inorganic salt hazardous wastes are subjected to resource treatment through aprocess of negative pressure drying, a multilayer suspended oxidation furnace and a high-temperature rotary oxidation furnace, and compared with a traditional industrial slag salt high-temperature heat treatment process, the process can efficiently remove organic matters and effectively solve the problems of inorganic salt melting agglomeration, high-temperature refractory material corrosion and pipeline blockage caused by cooling in a pipeline during inorganic salt refining which may exist at high temperature; by using a carbamido modified bagasse adsorbent, trace organic matters remaining ina salt solution can be effectively removed, and the process of negative pressure drying and high-temperature liquefaction oxidation furnace is adopted, so that the high-temperature decomposition rateof the organic matters in the slag salt can be guaranteed and the problem of melting agglomeration can be solved.

Description

Technical field [0001] The invention relates to the field of environmental protection treatment, in particular to a resource treatment process of inorganic salt hazardous waste. Background technique [0002] With the continuous development of chemical enterprises in Binhai and surrounding areas and the gradual strengthening of environmental protection supervision, the amount of industrial slag salt produced is increasing, which continues to restrict the development of enterprises. Industrial slag salt is a kind of salt containing sodium chloride slag salt, sodium sulphate slag salt, sodium chloride and sodium sulfate mixed salt, which comes from pesticide, medicine, fine chemical industry and other industries. In addition to the main components, the slag salt is also contaminated There are different organic matter, insoluble matter and a small amount of heavy metals, etc., which belong to hazardous waste. [0003] Sugarcane is one of the main raw materials for sugar production. A...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F9/04B09B3/00B09B5/00
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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