A barite thermal reduction-water immersion barium slag detoxification process

A barite and barium slag technology, which is applied in the field of barite thermal reduction-water immersion barium slag detoxification process, can solve the problems of high cost, inconvenient operation, and environmental pollution, and achieve the effect of reducing purification cost and easy operation

Inactive Publication Date: 2020-05-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If barium slag is soaked in sulfuric acid solution, H will be produced immediately 2 S gas, polluting the environment
Use sulfuric acid solution or sulfate solution with hydrogen peroxide to soak barium slag to avoid H 2 The production of S gas, but detoxification consumes a large amount of hydrogen peroxide, the cost is too high, and the operation is inconvenient, and the slightly soluble barium (barium carbonate, etc.) is difficult to remove.
Therefore, there is no ideal barium slag detoxification method at present.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take 1.5L of 5% sulfurous acid solution, add it to the barium residue containing 0.2% BaS at a solid-to-liquid ratio of 1:5g / ml, stir at room temperature for 1.5h, and filter to obtain the filtrate and filter residue. Add 0.5mol / L Na to the filter residue 2 SO 4 Soak the solution for 15 minutes to oxidize the barium sulfite into barium sulfate, take a sample for analysis, and the Ba in the solution after soaking 2+ The ion concentration is 0.53mg / L, the soluble Ba in the filter residue is less than 1ppm, and the barium residue is converted from hazardous solid waste to general solid waste. The resulting filtrate was passed through SO 2 , so that the concentration of sulfurous acid therein reaches 5.5% for later use.

Embodiment 2

[0043] Take 500 g of barium slag containing 0.15% BaS and grind it to -40 mesh, add the solution with a sulfurous acid concentration of 5.5% obtained in Example 1 at a solid-to-liquid ratio of 1:4 g / ml, stir at room temperature for 0.5 h, and then blow in air to continue Stir for 3h, filter, sample analysis, Ba in the filtrate 2+ The ion concentration is 0.15mg / L, the soluble Ba in the filter residue is less than 1ppm, and the obtained filtrate is passed through SO 2 make it regenerate.

Embodiment 3

[0045] The tail gas produced by the by-product sulfur in the barium carbonate production process is first sprayed and absorbed with water to obtain a solution containing sulfurous acid, and then lime water and lye are used to absorb the residual SO in the tail gas 2 emission. The resulting sulfurous acid-containing solution is partly drawn from the spray circulation system and used as a detoxification solution for the barium slag formed in the production process of barium carbonate. 2 , so that it can be regenerated and recycled. Take 4.5t of barium slag and put it in the leaching tank, draw out the detoxification solution from the spray circulation system, and use 25m 3 The rate of / h is circulated between the leaching tank and the spray system, and the barium dross is soaked in a cycle for 2 hours, drained, and stacked in the air for 1 week. Sampling analysis shows that the soluble Ba in the detoxified barium dregs is <1ppm.

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PUM

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Abstract

The invention discloses a detoxifying process for barite thermal-reducing and water-leaching barium slag. The detoxifying process comprises the following steps of: enabling barium slag obtained afterbarite thermal-reducing and water-leaching to be in contact with a solution containing sulphurous acid; converting soluble barium in the barium slag into barium sulfate or / and barium sulfite; converting sulfur ions into elemental sulfur; and filtering to obtain a detoxified solution and detoxified barium slag. The detoxified barium slag is further in contact with air, so that barium sulfite in thedetoxified barium slag is completely converted into barium sulfate, in other words, the obtained detoxified barium slag is dried in air for several days, and is ensured to be converted into common solid waste from dangerous solid waste; SO2 is led into the detoxified solution or sulfite and acid can be added for regenerating the detoxified barium slag which is returned to a detoxifying process for being recycled. Especially, tail gas generated by a byproduct sulfur in a barium carbonate production process is used as a regenerating agent of the detoxified solution, so that the barium slag detoxifying problem is effectively solved, and purifying cost of the tail gas is remarkably reduced, and therefore, the purpose of combating poison with poison is achieved, and double benefits are achieved. The process has the characteristics of being simple and convenient to operate, clean and environmentally friendly, economical and efficient, and the like, and is suitable for industrial productionof barite thermal-reducing and water-leaching barium slag detoxifying.

Description

technical field [0001] The invention belongs to the fields of chemical industry and metallurgy, and in particular relates to a barite heat reduction-water immersion barium slag detoxification process. Background technique [0002] Barite ore is the main raw material for barium salt production. After the barite ore is crushed, add carbothermal reduction to remove the BaSO 4 Converted to BaS, the obtained clinker is leached with water, BaS dissolves into the solution, and filtered to obtain the BaS-containing leachate-barium milk and the leached slag-barium slag composed of gangue and unreacted barite. BaS is converted into BaCO by carbonization of barium milk 3 and H 2 S, liquid-solid separation, drying to obtain barium carbonate product. The H produced by the reaction 2 S gas is absorbed by alkali to obtain sodium sulfide or sodium hydrogen sulfide, or sulfur is produced by the Claus method (air partial oxidation method), and the remaining tail gas of sulfur production ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/30A62D3/38A62D101/43
CPCA62D3/30A62D3/38A62D2101/43
Inventor 王学文王明玉葛奇杜艳苹
Owner CENT SOUTH UNIV
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