A non-toxic and resourceful treatment process for barium slag

Abstract

The present invention relates to the technical field of barium slag treatment technology, in particular to a non-toxic and resourceful treatment process for barium slag, comprising the following steps: (1) water dissolving: soaking barium slag with clear water and / or leachate from a barium slag field, Until the content of BaS in the barium slag is lower than 0.1%; (2) acid dissolution: soak the water-soluble barium slag in acid medium until the BaCO in the barium slag 3 (3) detoxification: soak the acid-dissolved barium slag in desulfurization wastewater until the content of BaS in the barium slag is lower than 1ppm, and then press filter to obtain no Toxic barium slag products. The barium slag is washed with water to recover BaS to prevent H 2 S is discharged, hydrochloric acid is dissolved, and BaCO in the barium slag is recovered 3 , The desulfurization wastewater rinses the acid-soluble residue to make the Ba in the residue non-toxic. This scheme has two major characteristics of resource utilization and non-toxicity.

Description

technical field [0001] The invention relates to the technical field of barium slag treatment technology, in particular to a non-toxic and resourceful treatment process for barium slag. Background technique [0002] my country's barium salt production has a history of 70 years, and the current production capacity has reached 10 million tons a year. At present, the production process of barium salt mainly adopts the mature process of the Soviet Union in the 1940s: calcining barite ore and coal powder in a converter at 800 degrees Celsius to form a BaS melt. Soak in water at high temperature to dissolve the crude BaS solution, refine and settle, then it can be used to produce BaCO 3 , BaCL, Ba(NO 3 ) 2 、Ba(OH) 2 , BaSO 4 And more than ten kinds of products, collectively referred to as barium salt. In the process of preparing various barium salts, BaS will precipitate H 2 S, used to produce sulfur, by-product SO 2 exhaust gas. SO 2 The exhaust gas is desulfurized with ...

AI Technical Summary

Problems solved by technology

[0006] (1) High cost, high expense, and large corrosion loss of equipment

[0007] (2) It cannot ensure that the non-toxic standard of soluble barium <1PPM g / t slag is still hazardous waste after treatment

[0008] (3) Purchased nitric acid, hydrochloric acid, and sulfuric acid are all hazardous chemicals, and the barium salt factories are all located in deep mountains and valleys. The cost of hazardous chemicals certification and long-distance mountain valley transportation is high, and the risk of accidents is great.

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