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Method utilizing witherite to prepare barium hydroxide octahydrate

A technology of barium hydroxide and barium witherite, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems such as low utilization rate of barium hydroxide, and achieve stable and reliable product quality, high decomposition efficiency, and easy operation. easy effect

Inactive Publication Date: 2012-07-18
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a high-efficiency and environment-friendly method for producing barium hydroxide octahydrate from witherite tailings in view of the low utilization rate of barium hydroxide produced from witherite tailings

Method used

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  • Method utilizing witherite to prepare barium hydroxide octahydrate
  • Method utilizing witherite to prepare barium hydroxide octahydrate

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Example 1: barium hydroxide is produced from witherite barium ore, crushed, ground and sieved witherite barium ore to control the particle size range to 120 mesh > 80%, add graphite powder 8%, sodium humate 1%, paraffin wax 2%, mix Granulate evenly with a granulator. After the ball is dry and hard, put it into the corundum boat, heat it with the furnace, keep it at 1100°C for 3 hours, and after cooling down to 500°C, put the clinker into the leaching kettle, use 85°C hot water, according to the liquid-solid ratio 10:1, medium speed leaching for 1 hour. After desulfurization, heat and concentrate the obtained feed liquid to 0.8mol.L -1 , natural cooling and crystallization, separation and drying to obtain octahydrate barium hydroxide, after filtration, the raffinate is soaked back for irrigation.

example 2

[0023] Example 2: Barium hydroxide is produced from witherite barium ore, crushed, ground and sieved witherite barium ore to control the particle size range of 120 mesh > 60%, add graphite powder 10%, sodium humate 1.2%, paraffin 2.5%, mix Granulate evenly with a granulator. After the ball is dry and hard, put it into a corundum boat, heat it with the furnace, and keep it at 1150°C for 3 hours. After cooling down to 600°C, put the clinker into the leaching kettle, use 90°C hot water, and adjust the temperature according to the liquid-solid ratio. 8:1, medium speed leaching for 1.5 hours. After desulfurization, heat and concentrate the obtained feed liquid to 0.8mol.L -1 , natural cooling and crystallization, separation and drying to obtain octahydrate barium hydroxide, after filtration, the raffinate is soaked back for irrigation.

example 3

[0024] Example 3: barium hydroxide is produced from witherite barium ore, pulverized, ground and sieved witherite barium ore to control the particle size range to 120 mesh > 70%, add graphite powder 15%, sodium humate 2%, paraffin wax 3%, mix Granulate evenly with a granulator. After the ball is dry and hard, put it into a corundum boat, heat it with the furnace, and keep it at 1200°C for 1 hour. After cooling down to 700°C, put the clinker into the leaching kettle, use 95°C hot water, and adjust the temperature according to the liquid-solid ratio. 7:1, medium speed leaching for 2 hours. After desulfurization, heat and concentrate the obtained feed liquid to 0.8mol.L -1 , natural cooling and crystallization, separation and drying to obtain octahydrate barium hydroxide, after filtration, the raffinate is soaked back for irrigation.

[0025] Experimental results

[0026]

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Abstract

The invention relates to a method utilizing witherite to prepare barium hydroxide octahydrate and belongs to the technical field of fine chemical engineering. The method utilizes witherite to serve as a raw material, witherite slag is sieved after grinding, the grain size is controlled at 120 mesh>50-80%, 8-15% of graphite powder, 1-2% of sodium humate and 2-3% of paraffin are added into the witherite, and pelletizing is performed through a pelletizer. After the grains are dry and hard, the grains are placed in a corundum boat and roasted for 2-3h at 1,000-1,200 DEG C, and the roasted grains are cooled to 500-700 DEG C, placed in hot water at 85-95 DEG C and soaked for 1-2h according to the solid-to-liquid ratio 1:(6-10). After desulfurization, material liquid is concentrated and crystallized so that a barium hydroxide product is obtained, and filtrate returns to a leaching tank to be recycled. Compared with other methods, the method enables thermal decomposition efficiency of witherite to be high, enables water leaching rate to be high, enables the product to be subjected to little influence of impurities in an additive, enables discharged solid residue to be little, and has a certain advantages.

Description

technical field [0001] The invention belongs to the technical field of production of inorganic chemical products, and in particular relates to an efficient and environment-friendly method for preparing barium hydroxide octahydrate from witherite barium ore. Background technique [0002] Barium hydroxide is an important inorganic chemical product, widely used in the manufacture of barium salts, dyes, stabilizers, glass and enamel, barium-based lubricating oil and other chemical products. [0003] Industrial production of barium hydroxide can use barite (the main component is BaSO 4 ) and witherite (the main component is BaCO 3 ) as raw materials, each has its own advantages and disadvantages. Among them, the process of producing barium hydroxide with barite as raw material is relatively mature, and barium hydroxide with high purity can be obtained, but there are also disadvantages such as high production cost and long process route; in the 1980s, the exploration of the geol...

Claims

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Application Information

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IPC IPC(8): C01F11/06
Inventor 张晓刚张进唐英刘代俊荣酬李斌
Owner CHONGQING UNIV OF ARTS & SCI
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