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A process for co-producing sodium sulfide black liquor and liquid caustic soda with baking soda, sodium chromate and soda sulfide

A technology of liquid caustic soda and soda sulfide, which is applied in the field of inorganic salts, can solve the problems of difficult sales of by-product ammonium chloride or calcium chloride in the market, high raw material cost of soda ash, high raw material cost, etc., and achieve low comprehensive energy consumption and production cost. Effect of high quality and added value, low raw material quality and price

Active Publication Date: 2019-10-15
CHINA LIGHT IND INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yet in above-mentioned technology, there is the problem that the technological process is long in baking soda production method, by-product ammonium chloride or calcium chloride market sale is difficult; And wherein sodium chromate production method exists the problem that soda ash raw material cost is high; There are problems such as high raw material cost in the production of soda sulfide by evaporative cooling

Method used

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  • A process for co-producing sodium sulfide black liquor and liquid caustic soda with baking soda, sodium chromate and soda sulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: a kind of soda sulfide black liquor, liquid caustic soda co-production baking soda, sodium chromate, soda sulfide technology, comprises the following steps:

[0024] 1. Take 100m 3 Using alkali sulfide black liquor as raw material (containing Na 2 S 270g / l, Na 2 S 2 o 3 4g / l, Na 2 SO 3 0.4g / l), after mixing with carbon dioxide (CO 2 25%) reaction (temperature 110 ℃) to get 100m 3 Heavy alkali mother liquor (containing NaHCO 3 75g / l, Na 2 CO 3 30g / l, Na 2 S 2 o 3 70g / l, Na 2 SO 3 17g / l, Na 2 SO 4 18g / l), 8.734 tons of hydrogen sulfide gas (H 2 S discount 100%) and 21.577 tons of baking soda (including NaHCO 3 95%) solid;

[0025] 2.100m 3 Heavy alkali mother liquor (containing NaHCO 3 75g / l, Na 2 CO 3 30g / l, Na 2 S 2 o 3 70g / l, Na 2 SO 3 17g / l, Na 2 SO 4 18g / l) to the next cycle and leaching with soda sulfide black ash to obtain 100m 3 Alkali sulfide black liquor (containing Na 2 S 270g / l, Na 2 S 2 o 3 4g / l,...

Embodiment 2

[0030] Embodiment 2: a kind of soda sulfide black liquor, liquid caustic soda co-production baking soda, sodium chromate, soda sulfide technology, comprises the following steps:

[0031] 1. Take 100m 3 Using alkali sulfide black liquor as raw material (containing Na 2 S 297g / l, Na 2 S 2 o 3 4g / l, Na 2 SO 3 0.4g / l), after mixing with carbon dioxide (CO 2 25%) reaction (temperature 110 ℃) to get 100m 3 Heavy alkali mother liquor (containing NaHCO 3 75g / l, Na 2 CO 3 30g / l, Na 2 S 2 o 3 70g / l, Na 2 SO 3 17g / l, Na 2 SO 4 18g / l), 9.607 tons of hydrogen sulfide gas (H 2 S discount 100%) and 23.735 tons of baking soda (including NaHCO 3 95%) solid;

[0032] 2.100m 3 Heavy alkali mother liquor (containing NaHCO 3 75g / l, Na 2 CO 3 30g / l, Na 2 S 2 o 3 70g / l, Na 2 SO 3 17g / l, Na 2 SO4 18g / l) to the next cycle and leaching with soda sulfide black ash to obtain 100m 3 Alkali sulfide black liquor (containing Na 2 S 297g / l, Na 2 S 2 o 3 4g / l, N...

Embodiment 3

[0037] Embodiment 3: a kind of soda sulfide black liquor, liquid caustic soda co-production baking soda, sodium chromate, soda sulfide process, comprises the following steps:

[0038] 1. Take 100m 3 Using alkali sulfide black liquor as raw material (containing Na 2 S 243g / l, Na 2 S 2 o 3 4g / l, Na 2 SO 3 0.4g / l), after mixing with carbon dioxide (CO 2 25%) reaction (temperature 110 ℃) to get 100m 3 Heavy alkali mother liquor (containing NaHCO 3 75g / l, Na 2 CO 3 30g / l, Na 2 S 2 o 3 70g / l, Na 2 SO 3 17g / l, Na 2 SO 4 18g / l), 7.861 tons of hydrogen sulfide gas (H 2 S discount 100%) and 19.419 tons of baking soda (including NaHCO 3 95%) solid;

[0039] 2.100m 3 Heavy alkali mother liquor (containing NaHCO 3 75g / l, Na 2 CO 3 30g / l, Na 2 S 2 o 3 70g / l, Na 2 SO 3 17g / l, Na 2 SO 4 18g / l) to the next cycle and leaching with soda sulfide black ash to obtain 100m 3 Alkali sulfide black liquor (containing Na 2 S 243g / l, Na 2 S 2 o 3 4g / l, Na...

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Abstract

The invention provides a process for coproducing baking soda, sodium chromate and sodium sulfide from sodium sulfide black liquid and liquid caustic soda. The process comprises the following steps: enabling the sodium sulfide black liquid as raw material liquid to react with carbon dioxide, so as to obtain a sodium bicarbonate mother solution, hydrogen sulfide gas and baking soda solids; introducing the sodium bicarbonate mother solution to the next cycle, leaching the sodium bicarbonate mother solution with sodium sulfide black ash, so as to obtain the sodium sulfide black liquid; enabling hydrogen sulfide gas to react with liquid caustic soda, so as to obtain a sodium sulfide solution; evaporating and concentrating the sodium sulfide solution, and cooling, so as to obtain sodium sulfide; and roasting the baking soda solids and chromite, so as to obtain sodium chromate. The process has the characteristics that the raw material quality and cost are low, the technical process is simple, the product quality and the added value are high, the comprehensive energy consumption and the production cost are low, the discharging of three wastes is avoided, and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic salts, in particular to a process for co-producing sodium sulfide black liquor and liquid caustic soda to produce baking soda, sodium chromate and soda sulfide. Background technique [0002] Known baking soda production method obtains soda ash carbonization production sodium chromate for combined soda method or ammonia soda method; Known sodium chromate production method is chromite and soda ash roasting production sodium chromate; Known sulfide production method is Glauber's salt calcination, leaching, evaporative cooling and production of soda sulfide. Yet in above-mentioned technology, there is the problem that the technological process is long in baking soda production method, by-product ammonium chloride or calcium chloride market sale is difficult; And wherein sodium chromate production method exists the problem that soda ash raw material cost is high; The production of soda sulfide by ev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/22C01D7/16C01G37/14C01B17/04
CPCC01B17/0404C01B17/22C01D7/16C01G37/14Y02P20/141
Inventor 彭赛军
Owner CHINA LIGHT IND INT ENG CO LTD
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